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2017-02-23

User Manual: Manitowoc Manitowoc-Qr0320A-Service-Manual-1003440

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ICE MACHINES

-Mode

Service Manual

C 2004 Manitowoc Ice, Inc.

80-1597-3

6/04

We reserve the right to make product improvements at any time.

Specifications and design are subject to change without notice.

Safety Notices

As you work on a Q-Series Ice Machine, be sure to pay

close attention to the safety notices in this manual.

Disregarding the notices may lead to serious injury and/

or damage to the ice machine.

Throughout this manual, you will see the following types

of safety notices:

Procedural Notices

As you work on a Q-Series Ice Machine, be sure to read

the procedural notices in this manual. These notices

supply helpful information which may assist you as you

work.

Throughout this manual, you will see the following types

of procedural notices:

NOTE: Text set off as a Note provides you with simple,

but useful, extra information about the procedure you

are performing.

Warning

PERSONAL INJURY POTENTIAL

Do not operate equipment that has been misused,

abused, neglected, damaged, or altered/modified

from that of original manufactured specifications.

Warning

Text in a Warning box alerts you to a potential

personal injury situation. Be sure to read the

Warning statement before proceeding, and work

carefully.

Caution

Text in a Caution box alerts you to a situation in

which you could damage the ice machine. Be sure

to read the Caution statement before proceeding,

and work carefully.

Important

Text in an Important box provides you with

information that may help you perform a procedure

more efficiently. Disregarding this information will

not cause damage or injury, but it may slow you

down as you work.

Attend A Manitowoc Factory Service School

• Improve Your Service Techniques

• Network with Your Peers

• 4 1/2 Days of Intensive Training on Manitowoc Ice Machines

• Extensive “Hands On” Training on a Variety of Equipment

• Breakfast, Lunch and Hotel Room Included with Tuition

• Contact Your Distributor or Manitowoc Ice, Inc. for Details

• Visit Our Website at www.manitowocice.com for School Dates

MANITOWOC ICE, INC.

2110 South 26th Street P.O. Box 1720

Manitowoc, WI 54221-1720

Phone: (920) 682-0161

Service Fax: (920) 683-7585

Web Site - www.manitowocice.com

Litho in U.S.A.

Part No. 80-1100-3 1

Table of Contents

Section 1

General Information

Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

How to Read a Model Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Ice Cube Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Model/Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Warranty Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Labor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Exclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Authorized Warranty Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Section 2

Installation Instructions

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Ice Machine Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Q320/Q370/Q420 Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Q200 – Q1000 Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Q1300/Q1600/Q1800 Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Q1300/Q1600/Q1800 Ice Machines (Cont.) . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Ice Storage Bin Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

S170/S400/S570 Ice Storage Bins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

S320/S420 Ice Storage Bins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

S970 Ice Storage Bins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Remote Condenser Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

JC0495/JC0895/JC1095/JC1395 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

JC1895 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Location of Ice Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Stacking Two Ice Machines on a Single Storage Bin . . . . . . . . . . . . . . . . . . . . 2-5

Ice Machine Heat of Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Leveling the Ice Storage Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Air-Cooled Baffle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Electrical Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Fuse/Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Minimum Circuit Ampacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Self-Contained Electrical Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Self Contained Ice Machine

115/1/60 or 208-230/1/60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Self Contained Ice Machine

208-230/3/60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Self Contained Ice Machine

230/1/50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

For United Kingdom Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Table of Contents (continued)

2Part No. 80-1100-3

Remote Electrical Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Remote Ice Machine

With Single Circuit Model Condenser

115/1/60 or 208-230/1/60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Remote Ice Machine

With Single Circuit Model Condenser

208-230/3/60 or 380-415/3/50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Remote Ice Machine

With Single Circuit Model Condenser

230/1/50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Water Supply and Drain Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Water Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Water Inlet Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Drain Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Cooling Tower Applications

(Water-Cooled Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Water Supply and Drain Line Sizing/Connections . . . . . . . . . . . . . . . . . . . . . 2-12

Remote Condenser/Line Set Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Remote Ice Machines

Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Guidelines for Routing Line Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Calculating Remote Condenser Installation Distances . . . . . . . . . . . . . . . . . 2-15

Lengthening or Reducing Line Set Lengths . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Connecting A Line Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Remote Receiver Service Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Remote Ice Machine Usage with Non-Manitowoc Multi-Circuit Condensers . 2-17

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Head Pressure Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Internal Condenser Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Condenser DT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Quick Connect Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Non-Manitowoc Multi-Circuit Condenser Sizing Chart . . . . . . . . . . . . . . . . . 2-18

Installation Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Additional Checks for Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Section 3

Maintenance

Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Operational Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Water Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Harvest Sequence Water Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Cleaning the Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Air-Cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Water-Cooled Condenser

and Water Regulating Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Interior Cleaning and Sanitizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Manitowoc’s Patented Cleaning or Sanitizing Technology . . . . . . . . . . . . . . 3-5

Table of Contents (continued)

Part No. 80-1100-3 3

AlphaSan“ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Sanitizing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Procedure To Cancel A Cleaning Or

Sanitizing Cycle After It Has Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Automatic Cleaning System (AuCS“) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Removal of Parts For Cleaning/Sanitizing . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Water Treatment/Filtration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Filter Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Removal from Service/Winterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Self-Contained Air-Cooled Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Water-Cooled Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Remote Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

AuCS“ Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Section 4

Ice Machine Sequence of Operation

Self-Contained Air- and Water-Cooled

Q200/Q280/Q320/Q370/Q420/Q450/Q600/Q800/Q1000/Q1300/Q1600/Q1800 . 4-1

Initial Start-Up or Start-Up After Automatic Shut-Off . . . . . . . . . . . . . . . . . . . 4-1

Freeze Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Harvest Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Automatic Shut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Remote

Q450/Q600/Q800/Q1000/Q1300/Q1600/Q1800 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Initial Start-Up or Start-Up After Automatic Shut-Off . . . . . . . . . . . . . . . . . . . 4-3

Freeze Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Harvest Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Automatic Shut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Section 5

Water System Ice Making Sequence of Operation

Initial Start-Up or Start-Up After Automatic Shut-Off . . . . . . . . . . . . . . . . . . . 5-1

Freeze Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Water Inlet Valve Safety Shut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Harvest Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Automatic Shut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Section 6

Electrical System

Energized Parts Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Self-Contained Air- And Water-Cooled Models . . . . . . . . . . . . . . . . . . . . . . 6-1

1. Initial Start-Up or Start-Up After Automatic Shut-Off . . . . . . . . . . . . . . . . . 6-1

Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

1. Initial Start-Up or Start-Up After Automatic Shut-Off . . . . . . . . . . . . . . . . . 6-2

Wiring Diagram Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Self-Contained Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

Table of Contents (continued)

4Part No. 80-1100-3

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17

Wiring Diagram Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17

Q200/Q280/Q320 - Self Contained - 1 Phase With Terminal Board . . . . . . . 6-18

Q280/Q370 - Self Contained - 1 Phase Without Terminal Board . . . . . . . . . 6-19

Q320 - Self Contained - 1 Phase Without Terminal Board . . . . . . . . . . . . . . 6-20

Q420/Q450/Q600/Q800/Q1000 - Self Contained -

1 Phase With Terminal Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21

Q420/Q450/Q600/Q800/Q1000 - Self Contained -

1 Phase Without Terminal Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22

Q800/Q1000 - Self Contained - 3 Phase With Terminal Board . . . . . . . . . . . 6-23

Q800/Q1000 - Self Contained - 3 Phase Without Terminal Board . . . . . . . . 6-24

Q1300/Q1800 - Self Contained - 1 Phase With Terminal Board . . . . . . . . . . 6-25

Q1300/Q1600/Q1800 - Self Contained - 1 Phase Without Terminal Board . 6-26

Q1300/Q1800 - Self Contained - 3 Phase With Terminal Board . . . . . . . . . . 6-27

Q1300/Q1600/Q1800 - Self Contained - 3 Phase Without Terminal Board . 6-28

Q450/Q600/Q800/Q1000 - Remote - 1 Phase With Terminal Board . . . . . . 6-29

Q450/Q600/Q800/Q1000 - Remote - 1 Phase Without Terminal Board . . . . 6-30

Q800/Q1000 -Remote - 3 Phase With Terminal Board . . . . . . . . . . . . . . . . . 6-31

Q800/Q1000 -Remote - 3 Phase Without Terminal Board . . . . . . . . . . . . . . 6-32

Q1300/Q1800 - Remote - 1 Phase With Terminal Board . . . . . . . . . . . . . . . 6-33

Q1300/Q1600/Q1800 - Remote - 1 Phase Without Terminal Board . . . . . . . 6-34

Q1300/Q1800 - Remote - 3 Phase With Terminal Board . . . . . . . . . . . . . . . 6-35

Q1300/Q1600/Q1800 - Remote - 3 Phase Without Terminal Board . . . . . . . 6-36

Component Specifications and Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

Bin Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

Compressor Electrical Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40

PTCR Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-41

ICE/OFF/CLEAN Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-44

Control Board Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-44

Electronic Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-45

Ice Thickness Probe (Harvest Initiation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47

How The Probe Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47

Harvest/Safety Limit Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47

Freeze Time Lock-In Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47

Maximum Freeze Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47

Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47

Diagnosing Ice Thickness Control Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . 6-48

Water Level Control Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50

Water Level Probe Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50

Water Inlet Valve Safety Shut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50

Freeze Cycle Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50

Harvest Cycle Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50

Diagnosing Freeze Cycle Potable Water Level Control Circuitry . . . . . . . . . 6-51

Diagnosing An Ice Machine That Will Not Run . . . . . . . . . . . . . . . . . . . . . . . . . 6-54

Table of Contents (continued)

Part No. 80-1100-3 5

Section 7

Refrigeration System

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Self-Contained Air or Water -Cooled Models . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Q1300/Q1600/Q1800 Refrigeration Tubing Schematics . . . . . . . . . . . . . . . 7-6

Operational Analysis (Diagnostics) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

Before Beginning Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9

Ice Production Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9

Installation/Visual Inspection Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Water System Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Ice Formation Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

Safety Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

Analyzing Discharge Pressure

During Freeze or Harvest Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17

Analyzing Suction Pressure

During Freeze Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

Single Expansion Valve Ice Machines -

Comparing Evaporator Inlet and

Outlet Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20

Harvest Valve Temperature Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21

Discharge Line Temperature Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-22

How to Use the Refrigeration System

Operational Analysis Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-24

Refrigeration System Operational Analysis Tables . . . . . . . . . . . . . . . . . . . . 7-25

Harvest Pressure Regulating

(H.P.R.) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27

Headmaster Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29

Pressure Control Specifications and Diagnostics . . . . . . . . . . . . . . . . . . . . . . 7-31

Fan Cycle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-31

High Pressure Cut-Out (HPCO) Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-31

Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts . . . . . . . . . 7-32

Q200 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-32

Q280 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-33

Q320 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-34

Q370 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-35

Q420/450 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-36

Q450 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37

Q600 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37

Q800 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-39

Q1000 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-40

Q1300 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-42

Q1600 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43

Q1800 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44

Table of Contents (continued)

6Part No. 80-1100-3

Refrigerant Recovery/Evacuation and Recharging . . . . . . . . . . . . . . . . . . . . . 7-46

Normal Self-Contained Model Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 7-46

Normal Remote Model Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-48

System Contamination Clean-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-52

Replacing Pressure Controls Without

Removing Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-54

Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56

Total System Refrigerant Charges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56

Refrigerant Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-57

Refrigerant Re-Use Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-58

HFC Refrigerant Questions and Answers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-59

Part No. 80-1100-3 1-1

Section 1

General Information

Model Numbers

This manual covers the following models:

NOTE: Model numbers ending in 3 indicate a 3-phase

unit. Example: QY1804A3

How to Read a Model Number

Ice Cube Sizes

Self-Contained

Air-Cooled Self-Contained

Water-Cooled Remote

QR0320A

QD0322A

QY0324A

QR0321W

QD0323W

QY0325W

QR0420A

QD0422A

QY0424A

QR0421W

QD0423W

QY0425W

QR0200A

QD0202A

QY0204A

QR0201W

QD0203W

QY0205W

QR0280A

QD0282A

QY0284A

QR0281W

QD0283W

QY0285W

QD0372A

QY0374A QD0373W

QY0375W --

QR0450A

QD0452A

QY0454A

QR0451W

QD0453W

QY0455W

QR0490N

QD0492N

QY0494N

QR0600A

QD0602A

QY0604A

QR0601W

QD0603W

QY0605W

QR0690N

QD0692N

QY0694N

QR0800A

QD0802A

QY0804A

QR0801W

QD0803W

QY0805W

QR0890N

QD0892N

QY0894N

QR1000A

QD1002A

QY1004A

QR1001W

QD1003W

QY1005W

QR1090N

QD1092N

QY1094N

QR1300A

QD1302A

QY1304A

QR1301W

QD1303W

QY1305W

QR1390N

QD1392N

QY1394N

-- QD1603W

QY1605W QD1692N

QY1694N

QR1800A

QD1802A

QY1804A

QR1801W

QD1803W

QY1805W

QR1890N

QD1892N

QY1894N

Warning

PERSONAL INJURY POTENTIAL

Do not operate equipment that has been misused,

abused, neglected, damaged, or altered/modified

from that of original manufactured specifications.

Regular

1-1/8" x 1-1/8" x 7/8"

2.86 x 2.86 x 2.22 cm

Dice

7/8" x 7/8" x 7/8"

2.22 x 2.22 x 2.22 cm

Half Dice

3/8" x 1-1/8" x 7/8"

0.95 x 2.86 x 2.22 cm

Q R 0450 A

ICE M ACHINE

MODEL

ICE CUBE SIZ E

R REG ULAR

D DICE

Y HALF DICE

# C UB E SIZ E

0 REG ULAR

1 R E G U L AR

2 DICE

3 DICE

4 H A LF-DICE

5 H A LF-DICE

CONDEN SER TY PE

AIR-COOLED

W ATER-COOLED

AIR-COOLED

W ATER-COOLED

AIR-COOLED

W ATER-COOLED

A SEL F-CON TAINED AIR -COOLED

W SELF-CON TAINED W ATER-COOLED

N REMO TE AIR-COOLED

9 REMO TE

AIR-COOLED

CONDEN SER TY PE

ICE M ACHINE

SER IES

General Information Section 1

1-2 Part No. 80-1100-3

Model/Serial Number Location

These numbers are required when requesting

information from your local Manitowoc distributor, or

Manitowoc Ice, Inc.

The model and serial number are listed on the MODEL/

SERIAL NUMBER DECAL affixed to the ice machine,

remote condenser and storage bin.

Figure 1-1. Model/Serial Number Location

SV1600

Section 1 General Information

Part No. 80-1100-3 1-3

Warranty Coverage

GENERAL

The following Warranty outline is provided for your

convenience. For a detailed explanation, read the

warranty bond shipped with each product.

Contact your local Manitowoc Distributor or Manitowoc

Ice, Inc. if you need further warranty information.

PARTS

1. Manitowoc warrants the ice machine against defects

in materials and workmanship, under normal use

and service for three (3) years from the date of

original installation.

2. The evaporator and compressor are covered by an

additional two (2) year (five years total) warranty

beginning on the date of the original installation.

LABOR

1. Labor required to repair or replace defective

components is covered for three (3) years from the

date of original installation.

2. The evaporator is covered by an additional two (2)

year (five years total) labor warranty beginning on

the date of the original installation.

EXCLUSIONS

The following items are not included in the ice machine’s

warranty coverage:

1. Normal maintenance, adjustments and cleaning.

2. Repairs due to unauthorized modifications to the ice

machine or use of non-standard parts without prior

written approval from Manitowoc Ice, Inc.

3. Damage caused by improper installation of the ice

machine, electrical supply, water supply or drainage,

or damage caused by floods, storms, or other acts of

God.

4. Premium labor rates due to holidays, overtime,

etc.; travel time; flat rate service call charges;

mileage and miscellaneous tools and material

charges not listed on the payment schedule.

Additional labor charges resulting from the

inaccessibility of equipment are also excluded.

5. Parts or assemblies subjected to misuse, abuse,

neglect or accidents.

6. Damage or problems caused by installation,

cleaning and/or maintenance procedures

inconsistent with the technical instructions provided

in this manual.

7. This product is intended exclusively for commercial

application. No warranty is extended for personal,

family, or household purposes.

AUTHORIZED WARRANTY SERVICE

To comply with the provisions of the warranty, a

refrigeration service company qualified and authorized

by a Manitowoc distributor, or a Contracted Service

Representative must perform the warranty repair.

Important

This product is intended exclusively for commercial

application. No warranty is extended for personal,

family, or household purposes.

General Information Section 1

1-4 Part No. 80-1100-3

THIS PAGE INTENTIONALLY LEFT BLANK

Part No. 80-1100-3 2-1

Section 2

Installation Instructions

General

Refer to Installation Manual for complete installation

guidelines.

Ice Machine Dimensions

Q320/Q370/Q420 ICE MACHINES

Important

Failure to follow these installation guidelines may

affect warranty coverage.

SV1602 SV1611

WATER COOLED AIR COOLED

Ice Machine Dimension H

Q320 21.5 in (54.6 cm)

Q370 21.5 in (54.6 cm)

Q420 26.5 in (67.3 cm)

Installation Instructions Section 2

2-2 Part No. 80-1100-3

Q200 – Q1000 ICE MACHINES Q1300/Q1600/Q1800 ICE MACHINES

SV1612 SV1628

WATER-COOLED SELF CONTAINED

AIR-COOLED

Ice Machine Dimension H

Q200 – Q280 16.5 in (41.9 cm)

Q450 21.5 in (54.6 cm)

Q600 21.5 in (54.6 cm)

Q800 26.5 in (67.3 cm)

Q1000 29.5 in (74.9 cm)

SV1613

AIR-COOLED

Ice Machine Dimension H

Q1300/Q1600 29.5 in (74.9 cm)

Q1800 29.5 in (74.9 cm)

SV1627

SELF CONTAINED

WATER-COOLED

Section 2 Installation Instructions

Part No. 80-1100-3 2-3

Q1300/Q1600/Q1800 ICE MACHINES (CONT.) Ice Storage Bin Dimensions

S170/S400/S570 ICE STORAGE BINS

S320/S420 ICE STORAGE BINS

SV1629

REMOTE AIR-COOLED

Bin Model Dimension A Dimension B

S170 29.5 in (74.9 cm) 19.1 in (48.5 cm)

S400 34.0 in (86.3 cm) 32.0 in (81.3 cm)

S570 34.0 in (86.3 cm) 44.0 in (111.7 cm)

Bin Model Dimension A Dimension B

S320 34.0 in (86.3 cm) 32.0 in (81.3 cm)

S420 34.0 in (86.3 cm) 44.0 in (111.7 cm)

SV1609

SV1614

Installation Instructions Section 2

2-4 Part No. 80-1100-3

S970 ICE STORAGE BINS Remote Condenser Dimensions

JC0495/JC0895/JC1095/JC1395

JC1895

Warning

All Manitowoc ice machines require the ice storage

system (bin, dispenser, etc.) to incorporate an ice

deflector.

The Q1300, Q1600 and Q1800 series ice machines

require adding Manitowoc Ice Deflector Kit K00139

when installing with non-Manitowoc ice storage

systems.

Prior to using a non-Manitowoc ice storage system

with other Manitowoc ice machines, contact the

manufacturer to assure their ice deflector is

compatible with Manitowoc ice machines.

SV1610 SV1297

SV1301

Section 2 Installation Instructions

Part No. 80-1100-3 2-5

Location of Ice Machine

The location selected for the ice machine must meet the

following criteria. If any of these criteria are not met,

select another location.

• The location must be free of airborne and other

contaminants.

• The air temperature must be at least 35°F (1.6°C),

but must not exceed 110°F (43.4°C).

• The location must not be near heat-generating

equipment or in direct sunlight.

• The location must not obstruct air flow through or

around the ice machine. Refer to the chart below for

clearance requirements.

Stacking Two Ice Machines on a Single

Storage Bin

A stacking kit is required for stacking two ice machines.

Installation instructions are supplied with the stacking kit.

Ice Machine Heat of Rejection

Ice machines, like other refrigeration equipment, reject

heat through the condenser. It is helpful to know the

amount of heat rejected by the ice machine when sizing

air conditioning equipment where self-contained air-

cooled ice machines are installed.

This information is also necessary when evaluating the

benefits of using water-cooled or remote condensers to

reduce air conditioning loads. The amount of heat added

to an air conditioned environment by an ice machine

using a water-cooled or remote condenser is negligible.

Knowing the amount of heat rejected is also important

when sizing a cooling tower for a water-cooled

condenser. Use the peak figure for sizing the cooling

tower.

Q1300/Q1600/

Q1800 Self-Contained

Air-Cooled Water-Cooled

and Remote

Top/Sides 24" (61 cm) 8" (20.3 cm)

Back 12" (30.5 cm) 5" (12.7 cm)

Q370 Self-Contained

Air-Cooled Water-Cooled

Top/Sides 12" (30.5 cm) 5" (12.7 cm)

Back 5" (127 mm) 5" (12.7 cm)

All other

Q models Self-Contained

Air-Cooled Water-Cooled

and Remote

Top/Sides 8" (20.3 cm) 8" (20.3 cm)

Back 5" (12.7 cm) 5" (12.7 cm)

There is no minimum clearance required. This value is

recommended for efficient operation and servicing only.

Q1600 is not available as an air-cooled model.

Caution

The ice machine must be protected if it will be

subjected to temperatures below 32°F (0°C).

Failure caused by exposure to freezing

temperatures is not covered by the warranty. See

“Removal from Service/Winterization” on Page 3-

14.

Q450/Q600/

Q800/Q1000

Stacked

Self-Contained

Air-Cooled

Stacked

Water-Cooled

and Remote*

Top/Sides 16" (40.64 cm) 5" (12.70 cm)

Back 5" (12.70 cm) 5" (12.70 cm)

Q1300/Q1600/

Q1800

Top/Sides 48" (121.92 cm) 24" (60.96 cm)

Back 12" (30.48 cm) 12" (30.48 cm)

*There is no minimum clearance required. This value is

recommended for efficient operation and servicing only.

Q1600 is not available as an air-cooled model.

Series

Ice Machine

Heat of Rejection

B.T.U./Hour

Air Conditioning

Because the heat of rejection varies during the ice making cycle,

the figure shown is an average.

Peak

Q320 4,600 6,200

Q370 3,900 5,950

Q420 7,000 9,600

Q200 3,800 5,000

Q280 3,800 6,000

Q450 7,000 9,600

Q600 9,000 13,900

Q800 12,400 19,500

Q1000 16,000 24,700

Q1300 24,000 35,500

Q1600 24,000 35,500

Q1800 36,000 50,000

Installation Instructions Section 2

2-6 Part No. 80-1100-3

Leveling the Ice Storage Bin

1. Screw the leveling legs onto the bottom of the bin.

2. Screw the foot of each leg in as far as possible.

3. Move the bin into its final position.

4. Level the bin to assure that the bin door closes and

seals properly. Use a level on top of the bin. Turn

each foot as necessary to level the bin.

NOTE: An optional caster assembly is available for use

in place of the legs. Installation instructions are supplied

with the casters.

Figure 2-1. Leveling Leg and Foot

Air-Cooled Baffle

The air-cooled baffle prevents condenser air from

recirculating. To install:

1. Remove the back panel screws next to the

condenser.

2. Align the mounting holes in the air baffle with the

screw holes and reinstall the screws.

Figure 2-2. Air Baffle

Caution

The legs must be screwed in tightly to prevent them

from bending.

SV1606

THREAD LEVELING

LEG INTO BASE OF

CABINET

THREAD ‘FOOT’ IN AS

FAR AS POSSIBLE

SV1607

AIR

BAFFLE

SCREWS

Section 2 Installation Instructions

Part No. 80-1100-3 2-7

Electrical Service

GENERAL

VOLTAGE

The maximum allowable voltage variation is ±10% of the

rated voltage at ice machine start-up (when the electrical

load is highest).

FUSE/CIRCUIT BREAKER

A separate fuse/circuit breaker must be provided for

each ice machine. Circuit breakers must be H.A.C.R.

rated (does not apply in Canada).

MINIMUM CIRCUIT AMPACITY

The minimum circuit ampacity is used to help select the

wire size of the electrical supply. (Minimum circuit

ampacity is not the ice machine’s running amp load.)

The wire size (or gauge) is also dependent upon

location, materials used, length of run, etc., so it must be

determined by a qualified electrician.

Warning

All wiring must conform to local, state and national

codes.

Warning

The ice machine must be grounded in accordance

with national and local electrical codes.

Installation Instructions Section 2

2-8 Part No. 80-1100-3

Table 2-1. Q320/370/420 Ice Machines

Table 2-2. Q200 - Q1000 Ice Machines

Ice Machine Voltage

Phase

Cycle

Air-Cooled Water Cooled

Maximum Fuse/

Circuit Breaker Minimum

Circuit Amps Maximum Fuse/

Circuit Breaker Minimum

Circuit Amps

Q320

115/1/60 15 11.2 15 10.5

208-230/1/60 15 4.8 15 4.2

230/1/50 15 5.2 15 4.7

Q370

115/1/60 20 12.9 20 12.2

208-230/1/60 15 6.2 15 5.8

230/1/50 15 6.2 15 5.8

Q420

115/1/60 20 12.3 20 11.4

208-230/1/60 15 7.8 15 7.4

230/1/50 15 6.3 15 5.9

Ice Machine Voltage

Phase

Cycle

Air-Cooled Water Cooled Remote

Maximum

Fuse/Circuit

Breaker

Minimum

Circuit Amps

Maximum

Fuse/Circuit

Breaker

Minimum

Circuit Amps

Maximum

Fuse/Circuit

Breaker

Minimum

Circuit Amps

Q200

115/1/60 15 11.6 15 10.9 N/A N/A

208-230/1/60 15 5.4 15 4.8 N/A N/A

230/1/50 15 5.2 15 4.9 N/A N/A

Q280

115/1/60 20 12.6 20 11.7 N/A N/A

208-230/1/60 15 5.7 15 5.2 N/A N/A

230/1/50 15 5.7 15 5.2 N/A N/A

Q450

115/1/60 20 12.8 20 11.9 20 13.6

208-230/1/60 15 7.8 15 7.4 N/A N/A

230/1/50 15 6.1 15 5.7 N/A N/A

Q600 208-230/1/60 15 9.2 15 8.7 15 9.3

230/1/50 15 9.2 15 8.8 15 9.4

Q800

208-230/1/60 20 12.1 20 11.4 20 11.9

208-230/3/60 15 8.9 15 8.2 15 8.9

230/1/50 20 12.0 20 10.6 20 11.2

Q1000

208-230/1/60 20 14.3 20 13.2 20 14.2

208-230/3/60 15 9.8 15 8.8 15 9.9

230/1/50 20 15.6 20 14.2 20 14.6

Q1300

208-230/1/60 30 19.5 30 18.1 30 19.8

208-230/3/60 20 13.1 20 11.6 20 12.7

230/1/50 30 15.7 30 14.3 30 14.7

380-415/3/50 N/A N/A N/A N/A 15 7.3

Q1600

208-230/1/60 N/A N/A 30 17.2 30 18.2

208-230/3/60 N/A N/A 20 11.0 20 12.0

230/1/50 N/A N/A N/A N/A N/A N/A

380-415/3/50 N/A N/A N/A N/A N/A N/A

Q1800

208-230/1/60 40 28.1 40 26.7 40 26.9

208-230/3/60 20 15.5 20 14.1 20 13.9

230/1/50 40 23.3 40 21.9 40 22.2

380-415/3/50 N/A N/A N/A N/A 15 9.1

Section 2 Installation Instructions

Part No. 80-1100-3 2-9

Self-Contained Electrical Wiring Connections

SELF CONTAINED ICE MACHINE

115/1/60 OR 208-230/1/60

SELF CONTAINED ICE MACHINE

208-230/3/60

SELF CONTAINED ICE MACHINE

230/1/50

Warning

These diagrams are not intended to show proper

wire routing, wire sizing, disconnects, etc., only the

correct wire connections.

All electrical work, including wire routing and

grounding, must conform to local, state and national

electrical codes.

Though wire nuts are shown in the drawings, the ice

machine field wiring connections may use either

wire nuts or screw terminals.

L1L1

N=115V

L2=208-230V

GROUND

ICE MACHINE

CONNECTIONS

SV1258

L1L1

GROUND

ICE MACHINE

CONNECTIONS TO SEPARATE

FUSE/BREAKER

SV1190

L1L1

GROUND GROUND

ICE MACHINE

CONNECTIONS

TO SEPARATE

FUSE/BREAKER.

DISCONNECT ALL

POLES.

SV1191

For United Kingdom Only

As the colours of the wires in the mains lead of the appliance may not correspond with the coloured markings

identifying the terminals in your plug, proceed as follows:

• The wire which is coloured green and yellow must be connected to the terminal in the plug which is marked with

the letter E or by the earth ground symbol or coloured green or green and yellow.

• The wire coloured blue must be connected to the terminal which is marked with the letter N or coloured black.

• The wire coloured brown must be connected to the terminal which is marked with the letter L or coloured red.

TO SEPARATE

FUSE/BREAKER

Installation Instructions Section 2

2-10 Part No. 80-1100-3

Remote Electrical Wiring Connections

REMOTE ICE MACHINE

WITH SINGLE CIRCUIT MODEL CONDENSER

115/1/60 OR 208-230/1/60

REMOTE ICE MACHINE

WITH SINGLE CIRCUIT MODEL CONDENSER

208-230/3/60 OR 380-415/3/50

REMOTE ICE MACHINE

WITH SINGLE CIRCUIT MODEL CONDENSER

230/1/50

Warning

These diagrams are not intended to show proper

wire routing, wire sizing, disconnects, etc., only the

correct wire connections.

All electrical work, including wire routing and

grounding, must conform to local, state and national

electrical codes.

Though wire nuts are shown in the drawings, the ice

machine field wiring connections may use either

wire nuts or screw terminals.

NOTE:

CONDENSER FAN

MOTOR VOLTAGE

MATCHES ICE

MACHINE

VOLTAGE (115V

OR 208-230V)

GROUND

SINGLE CIRCUIT

REMOTE

CONDENSER

ICE

MACHINE

SV1255

GROUND

TO SEPARATE

FUSE/BREAKER

GROUND

N=115V OR L2=208-230V

GROUND

ICE

MACHINE

SV1199

GROUND

TO SEPARATE

FUSE/BREAKER

GROUND

NOTE: FAN

MOTOR IS

208-230V

SINGLE CIRCUIT

REMOTE

CONDENSER

SINGLE CIRCUIT

REMOTE

CONDENSER

L2NOTE: FAN

MOTOR IS

220-240V

ICE

MACHINE

GROUND

TO SEPARATE

FUSE/BREAKER

(220-240).

DISCONNECT ALL

POLES.

SV1256

Section 2 Installation Instructions

Part No. 80-1100-3 2-11

Water Supply and Drain Requirements

WATER SUPPLY

Local water conditions may require treatment of the

water to inhibit scale formation, filter sediment, and

remove chlorine odor and taste.

WATER INLET LINES

Follow these guidelines to install water inlet lines:

• Do not connect the ice machine to a hot water

supply. Be sure all hot water restrictors installed for

other equipment are working. (Check valves on sink

faucets, dishwashers, etc.)

• If water pressure exceeds the maximum

recommended pressure, obtain a water pressure

regulator from your Manitowoc distributor.

• Install a water shut-off valve for both the ice making

and condenser water lines.

• Insulate water inlet lines to prevent condensation.

DRAIN CONNECTIONS

Follow these guidelines when installing drain lines to

prevent drain water from flowing back into the ice

machine and storage bin:

• Drain lines must have a 1.5 inch drop per 5 feet of

run (2.5 cm per meter), and must not create traps.

• The floor drain must be large enough to

accommodate drainage from all drains.

• Run separate bin and ice machine drain lines.

Insulate them to prevent condensation.

• Vent the bin and ice machine drain to the

atmosphere. Do not vent the condenser drain on

water-cooled models.

Cooling Tower Applications

(Water-Cooled Models)

A water cooling tower installation does not require

modification of the ice machine. The water regulator

valve for the condenser continues to control the

refrigeration discharge pressure.

It is necessary to know the amount of heat rejection, and

the pressure drop through the condenser and water

valves (inlet and outlet) when using a cooling tower on

an ice machine.

• Water entering the condenser must not exceed 90°F

(32.2°C).

• Water flow through the condenser must not exceed 5

gallons (19 liters) per minute.

• Allow for a pressure drop of 7 psi (48 kPA) between

the condenser water inlet and the outlet of the ice

machine.

• Water exiting the condenser must not exceed 110°F

(43.3°C).

Important

If you are installing a Manitowoc water filter system,

refer to the Installation Instructions supplied with the

filter system for ice making water inlet connections.

Installation Instructions Section 2

2-12 Part No. 80-1100-3

WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS

Figure 2-3. Typical Water Supply Drain Installation

Caution

Plumbing must conform to state and local codes.

Location Water Temperature Water Pressure Ice Machine Fitting Tubing Size Up to Ice

Machine Fitting

Ice Making

Water Inlet

33°F (0.6°C) Min.

90°F (32.2°C) Max.

20 psi (137.9 kPA) Min.

80 psi (551.5 kPA) Max.

3/8" Female

Pipe Thread 3/8" (9.5 mm) minimum

inside diameter

Ice Making

Water Drain --- --- 1/2" Female

Pipe Thread 1/2" (12.7 mm) minimum

inside diameter

Condenser

Water Inlet

33°F (0.6°C) Min.

90°F (32.2°C) Max.

20 psi (137.9 kPA) Min.

150 psi (1034.2 kPA) Max.

Q1300/Q1600/Q1800 - 1/2" Female Pipe Thread

All Others - 3/8" Female Pipe Thread

Condenser

Water Drain --- --- 1/2" Female

Pipe Thread 1/2" (12.7 mm) minimum

inside diameter

Bin Drain --- --- 3/4" Female

Pipe Thread 3/4" (19.1 mm) minimum

inside diameter

SV1626

Section 2 Installation Instructions

Part No. 80-1100-3 2-13

Remote Condenser/Line Set Installation

REMOTE ICE MACHINES

REFRIGERANT CHARGE

Each remote ice machine ships from the factory with a

refrigerant charge appropriate for installation with line

sets of up to 50' (15.25 m). The serial tag on the ice

machine indicates the refrigerant charge.

Additional refrigerant may be required for installations

using line sets between 50' and 100' (15.25-30.5 m)

long. If additional refrigerant is required, an additional

label located next to the Model/Serial Numbers decal

states the amount of refrigerant to be added.

Figure 2-4. Typical Additional Refrigerant Label

If there is no additional label, the nameplate charge is

sufficient for line sets up to 100' (30.5 m). (See the chart

below.)

Ice Machine Remote Single

Circuit

Condenser Line Set*

Q490 JC0495 RT-20-R404A

RT-35-R404A

RT-50-R404A

Q690 JC0895

Q890

Q1090 JC1095

Q1390 JC1395 RL-20-R404A

RL-35-R404A

RL-50-R404A

Q1690 JC1695

Q1890 JC1895

*Line Set Discharge Line Liquid Line

RT 1/2" (1.27 cm) 5/16" (.79 cm)

RL 1/2" (1.27 cm) 3/8" (.95 cm)

Air Temperature Around the Condenser

Minimum Maximum

-20°F (-28.9°C) 120°F (49°C)

IMPORTANT

EPA CERTIFIED TECHNICIANS

If remote line set length is between 50' and 100' (15.25-

30.5 m), add 1.5 lb. (24 oz) (0.68 kg) of refrigerant to the

nameplate charge.

Tubing length: ______________________________

Refrigerant added to nameplate: ________________

New total refrigerant charge: ___________________

WARNING

Potential Personal Injury Situation

The ice machine contains refrigerant charge. Installation of

the line sets must be performed by a properly trained and

EPA certified refrigeration technician aware of the dangers

of dealing with refrigerant charged equipment.

Ice Machine Nameplate Charge

(Charge Shipped in Ice Machine)

Refrigerant to be Added for

50'-100' Line Sets

Maximum System Charge

(Never Exceed)

Q490 6 lb. (96 oz.) None 6 lb. (96 oz.)

Q690 8 lb. (128 oz.) None 8 lb. (128 oz.)

Q890 8 lb. (128 oz.) None 8 lb. (128 oz.)

Q1090 9.5 lb. (152 oz.) None 9.5 lb. (152 oz.)

Q1390 12.5 lb. (200 oz.) 1.5 lb. (24 oz) 14 lb. (224 oz.)

Q1690 15 lb. (240 oz.) 2.0 lb. (32 oz) 17 lb. (272 oz.)

Q1890 15 lb. (240 oz.) 2.0 lb. (32 oz) 17 lb. (272 oz.)

Installation Instructions Section 2

2-14 Part No. 80-1100-3

GENERAL

Condensers must be mounted horizontally with the fan

motor on top.

Remote condenser installations consist of vertical and

horizontal line sets between the ice machine and the

condenser. When combined, they must fit within

approved specifications. The following guidelines,

drawings and calculation methods must be followed to

verify a proper remote condenser installation.

GUIDELINES FOR ROUTING LINE SETS

First, cut a 2.5" (6.35 cm) circular hole in the wall or roof

for tubing routing. The line set end with the 90° bend will

connect to the ice machine. The straight end will connect

to the remote condenser.

Follow these guidelines when routing the refrigerant

lines. This will help insure proper performance and

service accessibility.

1. Optional - Make the service loop in the line sets (See

Figure 2-5). This permits easy access to the ice

machine for cleaning and service. Do not use hard

rigid copper at this location.

2. Required - Do not form traps in the refrigeration lines

(except the service loop). Refrigerant oil must be

free to drain toward the ice machine or the

condenser. Route excess tubing in a supported

downward horizontal spiral (See Figure 2-5). Do not

coil tubing vertically.

3. Required - Keep outdoor refrigerant line runs as

short as possible.

Figure 2-5. Routing Line Sets

Caution

The 60 month compressor warranty (including the

36 month labor replacement warranty) will not apply

if the remote ice machine is not installed according

to specifications.

This warranty also will not apply if the refrigeration

system is modified with a condenser, heat reclaim

device, or other parts or assemblies not

manufactured by Manitowoc Ice, Inc., unless

specifically approved in writing by Manitowoc Ice,

Inc.

DOWNWARD

HORIZONTAL

SPIRAL

SV1204

Section 2 Installation Instructions

Part No. 80-1100-3 2-15

CALCULATING REMOTE CONDENSER

INSTALLATION DISTANCES

Line Set Length

The maximum length is 100' (30.5 m).

The ice machine compressor must have the proper oil

return. The receiver is designed to hold a charge

sufficient to operate the ice machine in ambient

temperatures between -20°F (-28.9°C) and 120°F

(49°C), with line set lengths of up to 100' (30.5 m).

Line Set Rise/Drop

The maximum rise is 35' (10.7 m).

The maximum drop is 15' (4.5 m).

Calculated Line Set Distance

The maximum distance is 150' (45.7 m).

Line set rises, drops, horizontal runs (or combinations of

these) in excess of the stated maximums will exceed

compressor start-up and design limits. This will cause

poor oil return to the compressor.

Make the following calculations to make sure the line set

layout is within specifications.

1. Insert the measured rise into the formula below.

Multiply by 1.7 to get the calculated rise.

(Example: A condenser located 10 feet above the

ice machine has a calculated rise of 17 feet.)

2. Insert the measured drop into the formula below.

Multiply by 6.6 to get the calculated drop.

(Example. A condenser located 10 feet below the

ice machine has a calculated drop of 66 feet.)

3. Insert the measured horizontal distance into the

formula below. No calculation is necessary.

4. Add together the calculated rise, calculated drop,

and horizontal distance to get the total calculated

distance. If this total exceeds 150' (45.7 m), move

the condenser to a new location and perform the

calculations again.

Maximum Line Set Distance Formula

Caution

If a line set has a rise followed by a drop, another

rise cannot be made. Likewise, if a line set has a

drop followed by a rise, another drop cannot be

made.

Step 1. Measured Rise (35' [10.7 m] Maximum) ______ x 1.7 =_______ Calculated Rise

Step 2. Measured Drop (15' [4.5 m] Maximum) ______ x 6.6 =_______ Calculated Drop

Step 3. Measured Horizontal Distance (100' [30.5 m] Maximum) _______ Horizontal Distance

Step 4. Total Calculated Distance 150' (45.7 m) _______ Total Calculated Distance

Figure 2-6. Combination of a Rise

and a Horizontal Run Figure 2-7. Combination of a Drop

and a Horizontal Run Figure 2-8. Combination of a

Rise, a Drop and a Horizontal Run

SV1196 SV1195 SV1194

Installation Instructions Section 2

2-16 Part No. 80-1100-3

LENGTHENING OR REDUCING LINE SET LENGTHS

In most cases, by routing the line set properly,

shortening will not be necessary. When shortening or

lengthening is required, do so before connecting the line

set to the ice machine or the remote condenser. This

prevents the loss of refrigerant in the ice machine or

condenser.

The quick connect fittings on the line sets are equipped

with Schraeder valves. Use these valves to recover any

vapor charge from the line set. When lengthening or

shortening lines, follow good refrigeration practices and

insulate new tubing. Do not change the tube sizes.

Evacuate the lines and place about 5 oz (143g) of vapor

refrigerant charge in each line.

CONNECTING A LINE SET

1. Remove the dust caps from the line set, condenser

and ice machine.

2. Apply refrigeration oil to the threads on the quick

disconnect couplers before connecting them to the

condenser.

3. Carefully thread the female fitting to the condenser

or ice machine by hand.

4. Tighten the couplings with a wrench until they

bottom out.

5. Turn an additional 1/4 turn to ensure proper brass-

to-brass seating. Torque to the following

specifications:

6. Check all fittings for leaks.

REMOTE RECEIVER SERVICE VALVE

The receiver service valve is closed during shipment.

Open the valve prior to starting the ice machine.

1. Remove the top and left side panels.

2. Remove the receiver service valve cap.

3. Backseat (open) the valve.

4. Reinstall the cap and panels.

Figure 2-9. Backseating the Receiver Service Valve

Liquid Line Discharge Line

10-12 ft lb.

(13.5-16.2 N•m) 35-45 ft lb.

(47.5-61.0 N•m)

SV1603

REMOVE FRONT, TOP,

AND LEFT SIDE PANEL

FOR ACCESS TO

RECEIVER VALVE

TURN

COUNTERCLOCKWISE TO

OPEN

RECEIVER SERVICE

VALVE CAP (TURN

COUNTERCLOCKWISE TO

REMOVE)

Section 2 Installation Instructions

Part No. 80-1100-3 2-17

Remote Ice Machine Usage with Non-Manitowoc Multi-Circuit Condensers

WARRANTY

The sixty (60) month compressor warranty, including

thirty six (36) month labor replacement warranty, shall

not apply when the remote ice machine is not installed

within the remote specifications. The foregoing warranty

shall not apply to any ice machine installed and/or

maintained inconsistent with the technical instructions

provided by Manitowoc Ice, Inc. Performance may vary

from Sales specifications. Q-Model ARI certified

standard ratings only apply when used with a Manitowoc

remote condenser.

If the design of the condenser meets the specifications,

Manitowoc’s only approval is for full warranty coverage

to be extended to the Manitowoc manufactured part of

the system. Since Manitowoc does not test the

condenser in conjunction with the ice machine,

Manitowoc will not endorse, recommend, or approve the

condenser, and will not be responsible for its

performance or reliability..

HEAD PRESSURE CONTROL VALVE

Any remote condenser connected to a Manitowoc Q-

Model Ice Machine must have a head pressure control

valve #836809-3 (available from Manitowoc Distributors)

installed on the condenser package. Manitowoc will not

accept substitute “off the shelf” head pressure control

valves.

FAN MOTOR

The condenser fan must be on during the complete ice

machine freeze cycle (do not cycle on fan cycle control).

The ice maker has a condenser fan motor circuit for use

with a Manitowoc condenser. It is recommended that this

circuit be used to control the condenser fan(s) on the

multi-circuit condenser to assure it is on at the proper

time. Do not exceed the rated amps for the fan motor

circuit listed on the ice machine’s serial tag.

INTERNAL CONDENSER VOLUME

The multi-circuit condenser internal volume must not be

less than or exceed that used by Manitowoc (see chart

on Page 2-18). Do not exceed internal volume and try

to add charge to compensate, as compressor failure

will result.

CONDENSER ∆T

∆T is the difference in temperature between the

condensing refrigerant and entering air. The ∆T should

be 15 to 20°F (-9.4 to -6.6°C) at the beginning of the

freeze cycle (peak load conditions) and drop down to 12

to 17°F (-11.1 to -8.3°C) during the last 75% of the

freeze cycle (average load conditions).

REFRIGERANT CHARGE

Remote ice machines have the serial plate refrigerant

charge (total system charge) located in the ice maker

section. (Remote condensers and line sets are supplied

with only a vapor charge.)

QUICK CONNECT FITTINGS

The ice machine and line sets come with quick connect

fittings. It is recommended that matching quick connects

(available through Manitowoc Distributors) be installed in

the multi-circuit condenser, and that a vapor “holding”

charge (5 oz.) of proper refrigerant be added to the

condenser prior to connection of the ice machine or line

set to the condenser.

Important

Manitowoc warrants only complete new and unused

remote packages. Guaranteeing the integrity of a

new ice machine under the terms of our warranty

prohibits the use of pre-existing (used) tubing or

condensers.

Caution

Do not use a fan cycling control to try to maintain

discharge pressure. Compressor failure will result.

Caution

Never add more than nameplate charge to ice

machine for any application.

Installation Instructions Section 2

2-18 Part No. 80-1100-3

NON-MANITOWOC MULTI-CIRCUIT CONDENSER SIZING CHART

Figure 2-10. Typical Single Circuit Remote Condenser Installation

Ice

Machine

Model

Refrigerant Heat of Rejection Internal

Condenser

Volume (cu ft) Design

Pressure

Quick Connect Stubs-

Male Ends Head

Pressure

Control

Valve

Type Charge Average

Btu/hr Peak

Btu/hr Min Max Discharge Liquid

Q450 R-404A 6 lbs. 7,000 9,600 0.020 0.035 500 psig

safe working

pressure

coupling

P/N

83-6035-3

coupling

P/N

83-6034-3

Manitowoc

P/N

83-6809-3

Q600 R-404A 8 lbs. 9,000 13,900 0.045 0.060

Q800 R-404A 8 lbs. 12,400 19,500 0.045 0.060

2,500 psig

burst

pressure

mounting

flange P/N

83-6006-3

mounting

flange P/N

83-6005-3

substitutes

Q1000 R-404A 9.5 lbs. 16,000 24,700 0.065 0.085

Q1300 R-404A 14 lbs.124,000 35,500 0.085 0.105

Q1600 R-404A 17 lbs.136,000 50,000 0.130 0.170

Q1800 R-404A 17 lbs.

Amount reflects additional R-404A refrigerant added to nameplate charge for 50' to 100' line sets, to ensure proper operation at all ambient

conditions. Q1300 has 1.5 lbs. additional R-404A. Q1600 and Q1800 has 2.0 lbs. additional R-404A

36,000 50,000 0.130 0.170

SV1615

SINGLE CIRCUIT REMOTE

CONDENSER

ELECTRICAL

DISCONNECT

DISCHARGE

LINE

LIQUID LINE

ELECTRICAL

DISCONNECT

ELECTRICAL

SUPPLY

ICE MACHINE

BIN

DISCHARGE

REFRIGERANT

LINE

LIQUID

REFRIGERANT

LINE

36.00"

(91.44 cm)

DROP

Section 2 Installation Instructions

Part No. 80-1100-3 2-19

Installation Check List

Is the Ice Machine level?

Has all of the internal packing been removed?

Have all of the electrical and water connections

been made?

Has the supply voltage been tested and checked

against the rating on the nameplate?

Is there proper clearance around the ice machine

for air circulation?

Has the ice machine been installed where

ambient temperatures will remain in the range of

35° - 110°F (1.7° - 43.3°C)?

Has the ice machine been installed where the

incoming water temperature will remain in the

range of 33° - 90°F (0.6° - 32.2°C)?

Is there a separate drain for the water-cooled

condenser?

Is the water trough drain plug installed? (The drain

plug is taped to the top of the water pump).

Are the ice machine and bin drains vented?

Are all electrical leads free from contact with

refrigeration lines and moving equipment?

Has the owner/operator been instructed

regarding maintenance and the use of

Manitowoc Cleaner and Sanitizer?

Has the owner/operator completed the warranty

registration card?

Has the ice machine and bin been sanitized?

Is the toggle switch set to ice? (The toggle switch

is located directly behind the front panel).

Is the ice thickness control set correctly? (Refer

to Operational Checks on page 3-4 of this

manual to check/set the correct ice bridge

thickness).

Additional Checks for Remote Models

Has the receiver service valve been opened?

Does the remote condenser fan operate properly

after start-up?

Has the remote condenser been located where

ambient temperatures will remain in the range of

-20° - 120°F ( -6.6 - 49°C).

Is the line set routed properly?

Installation Instructions Section 2

2-20 Part No. 80-1100-3

THIS PAGE INTENTIONALLY LEFT BLANK

Part No. 80-1100-3 3-1

Section 3

Maintenance

Component Identification

Figure 3-1. Component Identification (Typical Q450 Shown)

WATER COOLED

MODEL

CONDENSER WATER

REGULATING VALVE

WATER

CONDENSER

ICE THICKNESS

PROBE EVAPORATOR

HIGH PRESSURE CUTOUT/

MANUAL RESET

(When applicable)

WATER

CURTAIN

WATER

TROUGH

ICE/OFF/CLEAN

SWITCH

WATER

PUMP

BIN SWITCH

DISTRIBUTION

TUBE

SV1604G

SV1605

HARVEST VALVE

AIR CONDENSER

REMOTE COUPLINGS

COMPRESSOR

DRAIN HOSE

WATER DUMP VALVE

Maintenance Section 3

3-2 Part No. 80-1100-3

Operational Checks

GENERAL

Manitowoc ice machines are factory-operated and

adjusted before shipment. Normally, new installations do

not require any adjustment.

To ensure proper operation, always follow the

Operational Checks:

• when starting the ice machine for the first time

• after a prolonged out of service period

• after cleaning and sanitizing

NOTE: Routine adjustments and maintenance

procedures are not covered by the warranty.

WATER LEVEL

The water level sensor is set to maintain the proper

water level above the water pump housing. The water

level is not adjustable.

If the water level is incorrect, check the water level probe

for damage (probe bent, etc.). Repair or replace the

probe as necessary.

Figure 3-2. Water Level Probe

ICE THICKNESS CHECK

The ice thickness probe is factory-set to maintain the ice

bridge thickness at 1/8" (3.2 mm).

NOTE: Make sure the water curtain is in place when

performing this check. It prevents water from splashing

out of the water trough.

1. Inspect the bridge connecting the cubes. It should

be about 1/8" (3.2 mm) thick.

2. If adjustment is necessary, turn the ice thickness

probe adjustment screw clockwise to increase

bridge thickness, counterclockwise to decrease

bridge thickness.

NOTE: Turning the adjustment 1/3 of a turn will change

the ice thickness about 1/16" (1.5 mm).

Figure 3-3. Ice Thickness Check

3. Make sure the ice thickness probe wire and the

bracket do not restrict movement of the probe.

SV1616

SV1208

ADJUSTING SCREW

1/8” ICE BRIDGE THICKNESS

Section 3 Maintenance

Part No. 80-1100-3 3-3

HARVEST SEQUENCE WATER PURGE

The harvest sequence water purge adjustment may be

used when the ice machine is hooked up to special

water systems, such as a de-ionized water treatment

system.

• The harvest sequence water purge may be set to 15,

30, or 45 seconds.

• During the harvest sequence water purge, the water

fill valve energizes and de-energizes by time. The

water purge must be at the factory setting of 45

seconds for the water fill valve to energize during the

last 15 seconds of the water purge. If it is set to less

than 45 seconds, the water fill valve will not energize

during the water purge.

Figure 3-4. Water Purge Adjustment

Cleaning the Condenser

AIR-COOLED CONDENSER

(SELF-CONTAINED AND REMOTE MODELS)

A dirty condenser restricts airflow, resulting in

excessively high operating temperatures. This reduces

ice production and shortens component life. Clean the

condenser at least every six months. Follow the steps

below.

1. The washable aluminum filter on self-contained ice

machines is designed to catch dust, dirt, lint and

grease. This helps keep the condenser clean. Clean

the filter with a mild soap and water solution.

Figure 3-5. Self-Contained Air-Cooled Filter

2. Clean the outside of the condenser (bottom of a

remote condenser) with a soft brush or a vacuum

with a brush attachment. Clean from top to bottom,

not side to side. Be careful not to bend the

condenser fins.

Continued on next page …

Important

The harvest sequence water purge is factory-set at

45 seconds. A shorter purge setting (with standard

water supplies such as city water) is not

recommended. This can increase water system

cleaning and sanitizing requirements.

30 45

SV1617

CONTROL

BOARD

WATER PURGE

ADJUSTMENT

Warning

Disconnect electric power to the ice machine and

the remote condenser at the electric service switch

before cleaning the condenser.

Caution

The condenser fins are sharp. Use care when

cleaning them.

SV1608

AIR FILTER

Maintenance Section 3

3-4 Part No. 80-1100-3

3. Shine a flashlight through the condenser to check

for dirt between the fins. If dirt remains:

A. Blow compressed air through the condenser fins

from the inside. Be careful not to bend the fan

blades.

B. Use a commercial condenser coil cleaner.

Follow the directions and cautions supplied with

the cleaner.

4. Straighten any bent condenser fins with a fin comb.

Figure 3-6. Straighten Bent Condenser Fins

5. Carefully wipe off the fan blades and motor with a

soft cloth. Do not bend the fan blades. If the fan

blades are excessively dirty, wash with warm, soapy

water and rinse thoroughly.

WATER-COOLED CONDENSER

AND WATER REGULATING VALVE

Symptoms of restrictions in the condenser water circuit

include:

• Low ice production

• High water consumption

• High operating temperatures

• High operating pressures

If the ice machine is experiencing any of these symptoms,

the water-cooled condenser and water regulating valve

may require cleaning due to scale build-up.

The cleaning procedures require special pumps and

cleaning solutions. Follow the manufacturer’s

instructions for the specific cleaner being used.

Caution

If you are cleaning the condenser fan blades with

water, cover the fan motor to prevent water

damage.

CONDENSER

SV1515

FIN COMB

“COMB”

DOWN

ONLY

Section 3 Maintenance

Part No. 80-1100-3 3-5

Interior Cleaning and Sanitizing

GENERAL

Clean and sanitize the ice machine every six months for

efficient operation. If the ice machine requires more

frequent cleaning and sanitizing, consult a qualified

service company to test the water quality and

recommend appropriate water treatment or installation

of AuCS accessory (Automatic Cleaning System). If

required, an extremely dirty ice machine may be taken

apart for cleaning and sanitizing.

MANITOWOC’S PATENTED CLEANING OR

SANITIZING TECHNOLOGY

Manitowoc Ice Machines include technology that allows

the initiation and completion of a cleaning or sanitizing

cycle at the flip of a switch. This cycle will permit

cleaning or sanitizing of all surfaces that come in contact

with the water distribution system. Periodic maintenance

must be performed that includes sanitizing the bin (or

dispenser) and adjacent surface areas, which cannot be

contacted by the water distribution system.

This technology will also allow initiation and completion

of a clean or sanitize cycle, after which the ice machine

automatically starts ice making again.

Refer to the cleaning or sanitizing procedure for

complete details.

The AuCS Accessory can be set to automatically start

and finish a clean or sanitize cycle every 2, 4, or 12

weeks. This accessory monitors ice-making cycles and

initiates a cleaning or sanitizing cycle automatically.

Refer to Automatic Cleaning System (AuCS) Accessory

for further details.

ALPHASAN

The goal of AlphaSan is to keep the plastic surfaces of

an ice machine cleaner, by reducing or delaying the

formation of bio-film. The active ingredient in

AlphaSan is the element silver in the form of silver ions

(Ag+). AlphaSan slowly releases silver ions via an ion

exchange mechanism. When AlphaSan is

compounded directly into a plastic part, a controlled

release of silver ions from the surface is regulated to

maintain an effective concentration at or near the

surface of the plastic ice machine part. AlphaSan’s

unique ability to effectively control the release of silver

not only protects against undesired discoloration of the

plastic, but also will last the life of the plastic part.

Although AlphaSan helps prevent bio-film build up it

does not eliminate the need for periodic cleaning and

maintenance. AlphaSan has no adverse effect on the

taste of the ice or beverage.

Caution

Use only Manitowoc approved Ice Machine Cleaner

(part number 94-0546-3) and Sanitizer (part number

94-0565-3). It is a violation of Federal law to use

these solutions in a manner inconsistent with their

labeling. Read and understand all labels printed on

bottles before use.

Caution

Do not mix Cleaner and Sanitizer solutions together.

It is a violation of Federal law to use these solutions

in a manner inconsistent with their labeling.

Warning

Wear rubber gloves and safety goggles (and/or face

shield) when handling ice machine Cleaner or

Sanitizer.

Maintenance Section 3

3-6 Part No. 80-1100-3

CLEANING PROCEDURE

Ice machine cleaner is used to remove lime scale or

other mineral deposits. It is not used to remove algae or

slime. Refer to the section on Sanitizing for removal of

algae and slime.

Step 1 Set the toggle switch to the OFF position after

ice falls from the evaporator at the end of a Harvest

cycle. Or, set the switch to the OFF position and allow

the ice to melt off the evaporator.

Step 2 To start cleaning, place the toggle switch in the

CLEAN position. The water will flow through the water

dump valve and down the drain. The Clean light will turn

on to indicate the ice machine is in the Cleaning mode.

Step 3 Wait about one minute or until water starts to

flow over the evaporator.

Step 4 Add the proper amount of Manitowoc Ice

Machine Cleaner to the water trough.

Step 5 The ice machine will automatically time out a

ten minute cleaning cycle, followed by six rinse cycles,

and stop. The Clean light will turn off to indicate the

Cleaning mode is completed. This entire cycle lasts

approximately 25 minutes.

Step 6 When the cleaning process stops, move the

toggle switch to OFF position. Refer to “Sanitizing

Procedure” on the next page.

Step 7

A. The ice machine may be set to start and finish a

cleaning procedure then automatically start ice

making again.

B. You must wait about one minute into the

cleaning cycle (until water starts to flow over the

evaporator) then move the switch from CLEAN

to ICE position.

C. When the cleaning cycle is completed, an ice

making sequence will start automatically.

Caution

Never use anything to force ice from the evaporator.

Damage may result.

Model Amount of Cleaner

Q200 Q280 Q320 Q370 3 ounces (90 ml)

Q420 Q450 Q600 Q800 5 ounces (150 ml)

Q1000 Q1300

Q1600 Q1800 9 ounces (270 ml)

Important

After the toggle switch is moved to the ICE position,

opening the curtain switch will interrupt the cleaning

sequence. The sequence will resume from the point

of interruption when the curtain switch closes.

Section 3 Maintenance

Part No. 80-1100-3 3-7

SANITIZING PROCEDURE

Use sanitizer to remove algae or slime. Do not use it to

remove lime scale or other mineral deposits.

Step 1 Set the toggle switch to the OFF position after

ice falls from the evaporator at the end of a Harvest

cycle. Or, set the switch to the OFF position and allow

the ice to melt off the evaporator.

Step 2 Refer to Removal of Parts For Cleaning/

Sanitizing and remove ice machine parts.

Step 3 Mix a solution of water and sanitizer.

Step 4 Use the sanitizing solution and a sponge or

cloth to sanitize (wipe) all parts and interior surfaces of

the ice machine. Sanitize the following areas:

A. Side walls

B. Base (area above water trough)

C. Evaporator plastic parts

D. Bin or dispenser

Step 5 Rinse all sanitized areas with clear water.

Step 6 Install the removed parts, restore power and

place toggle switch in the ice position.

Caution

Never use anything to force ice from the evaporator.

Damage may result.

Warning

Disconnect electric power to the ice machine (and

dispenser if applicable) at the electric switch box

before proceeding.

Solution Type Water Mixed With

Sanitizer 4 gal. (15 l) 3 oz (90 ml) sanitizer

Maintenance Section 3

3-8 Part No. 80-1100-3

AUTOMATIC CLEANING SYSTEM (AuCS)

This accessory monitors ice making cycles and initiates

cleaning (or sanitizing) procedures automatically. The

AuCS Accessory can be set to automatically clean or

sanitize the ice machine every 2, 4, or 12 weeks.

Automatic Operation

The following occurs when the toggle switch is in the ICE

position:

• The ice machine control board counts the number of

ice harvest cycles.

•The AuCS

 accessory interrupts the ice making

mode and starts the cleaning (or sanitizing) mode

when the harvest count equals the “Frequency of

Cleaning” setting of the AuCS.

• When the automatic cleaning (or sanitizing) cycle is

complete (approximately 25 minutes), ice making

resumes automatically, and the “Harvest Count” is

reset to zero.

Manual Start Operation

Step 1 Set the toggle switch to the OFF position after

ice falls from the evaporator at the end of a Harvest

cycle. Or, set the switch to the OFF position and allow

the ice to melt off the evaporator.

Step 2 To start the automatic cleaning system, move

the toggle switch to the CLEAN position. The water will

flow through the water dump valve and down the drain.

The Clean light will turn on to indicate the ice machine is

in the Self Cleaning mode. The AuCS then

automatically adds cleaner or sanitizer to the ice

machine.

Step 3 The ice machine will automatically time out a

ten minute cleaning or sanitizing cycle, followed by six

rinse cycles, (de-energize the Clean light) and stop. This

entire cycle lasts approximately 25 minutes.

Step 4 After the cleaning or sanitizing cycle stops,

move the toggle switch to ICE position.

Step 5

A. The ice machine may be set to start and finish a

cleaning or sanitizing cycle, then automatically

start ice making again.

B. You must wait about one minute into the

cleaning cycle (until water starts to flow over the

evaporator), then move the toggle switch from

CLEAN to ICE position.

C. When the cleaning or sanitizing cycle is

completed, the clean light will turn off and an ice

making sequence will start automatically.

Caution

Refer to the AuCS Accessory Installation - Use

and Care Manual for complete details on the

installation, operation, maintenance and cautionary

statements of this accessory.

Important

Opening the curtain switch will interrupt the cleaning

or sanitizing sequence. The sequence will resume

from the point of interruption when the curtain re-

closes.

Caution

Never use anything to force ice from the evaporator.

Damage may result.

Section 3 Maintenance

Part No. 80-1100-3 3-9

REMOVAL OF PARTS FOR CLEANING/SANITIZING

1. Turn off the water supply to the ice machine at the

water service valve.

2. Remove the water curtain and the components you

want to clean or sanitize. See the following pages for

removal procedures for these parts.

3. Soak the removed part(s) in a properly mixed

solution.

4. Use a soft-bristle brush or sponge (NOT a wire

brush) to carefully clean the parts.

5. Use the solution and a brush to clean the top, sides,

and bottom evaporator extrusions; the inside of the

ice machine panels; and the entire inside of the bin.

6. Thoroughly rinse all of the parts and surfaces with

clean water.

7. Install the removed parts.

NOTE: Incomplete rinsing of the ice thickness probe or

water level probe may leave a residue. This could cause

the ice machine to malfunction. For best results, brush or

wipe the probes off while rinsing it. Thoroughly dry the

probes before installing them.

8. Turn on the water and electrical supply.

Warning

Disconnect electric power to the ice machine at the

electric switch box before proceeding.

Warning

Wear rubber gloves and safety goggles (and/or face

shield) when handling Ice Machine Cleaner or

Sanitizer.

Solution Type Water Mixed With

Cleaner 1 gal. (4 l) 16 oz (500 ml) cleaner

Sanitizer 4 gal. (15 l) 1 oz (30 ml) sanitizer

Caution

Do not mix Cleaner and Sanitizer solutions together.

It is a violation of Federal law to use these solutions

in a manner inconsistent with their labeling.

Caution

Do not immerse the water pump motor in the

cleaning or sanitizing solution.

Maintenance Section 3

3-10 Part No. 80-1100-3

Water Dump Valve

The water dump valve normally does not require

removal for cleaning. To determine if removal is

necessary:

1. Locate the water dump valve.

2. Set the toggle switch to ICE.

3. While the ice machine is in the freeze mode, check

the dump valve’s clear plastic outlet drain hose for

leakage.

A. If the dump valve is leaking, remove,

disassemble and clean it.

B. If the dump valve is not leaking, do not remove

it. Instead, follow the “Cleaning Procedure” on

Page 3-5.

Follow the procedure below to remove the dump valve.

1. If so equipped, remove the water dump valve shield

from its mounting bracket.

2. Lift and slide the coil retainer cap from the top of the

coil.

3. Note the position of the coil assembly on the valve

for assembly later. Leaving the wires attached, lift

the coil assembly off the valve body and the

enclosing tube.

4. Press down on the plastic nut on the enclosing tube

and rotate it 1/4 turn. Remove the enclosing tube,

plunger, and plastic gasket from the valve body.

NOTE: At this point, the water dump valve can easily be

cleaned. If complete removal is desired, continue with

step 5.

Figure 3-7. Dump Valve Removal

NOTE: During cleaning, do not stretch, damage or

remove the spring from the plunger. If it is removed, slide

the spring’s flared end into the plunger’s slotted top

opening until the spring contacts the plunger spring stop.

5. Remove the valve body.

6. Remove the tubing from the dump valve by twisting

the clamps off.

7. Remove the two screws securing the dump valve

and the mounting bracket.

Figure 3-8. Dump Valve Disassembly

Warning

Disconnect the electric power to the ice machine at

the electric service switch box and turn off the water

supply before proceeding.

Important

The plunger and the inside of the enclosing tube

must be completely dry before assembly.

CAP

PLUNGER

SPRING STOP

SPRING

PLUNGER

DIAPHRAM

VALVE BODY

ENCLOSING

TUBE

COIL

Section 3 Maintenance

Part No. 80-1100-3 3-11

Water Pump

1. Disconnect the water pump power cord.

Figure 3-9. Water Pump Removal

2. Disconnect the hose from the pump outlet.

3. Loosen the screws securing the pump mounting

bracket to the bulkhead.

4. Lift the pump and bracket assembly off the screws.

Ice Thickness Probe

1. Compress the side of the ice thickness probe near

the top hinge pin and remove it from the bracket.

Figure 3-10. Ice Thickness Probe Removal

NOTE: At this point, the ice thickness probe can easily

be cleaned. If complete removal is desired, continue with

step 2 below.

2. Disconnect the wire lead from the control board

inside the electrical control box.

Ice Thickness Probe Cleaning

1. Mix a solution of Manitowoc ice machine cleaner

and water (2 ounces of cleaner to 16 ounces of

water) in a container.

2. Soak ice thickness probe in container of cleaner/

water solution while disassembling and cleaning

water circuit components (soak ice thickness probe

for 10 minutes or longer).

3. Clean all ice thickness probe surfaces including all

plastic parts (do not use abrasives). Verify the ice

thickness probe cavity is clean. Thoroughly rinse ice

thickness probe (including cavity) with clean water,

then dry completely. Incomplete rinsing and

drying of the ice thickness probe can cause

premature harvest.

4. Reinstall ice thickness probe, then sanitize all ice

machine and bin/dispenser interior surfaces.

Warning

Disconnect the electric power to the ice machine at

the electric service switch box and turn off the water

supply.

SV1618

POWER

CORD

WATER

PUMP

LOOSEN

SCREWS

PUMP

OUTLET

Warning

Disconnect the electric power to the ice machine at

the electric service switch box.

SV1619

DISCONNECT

WIRE LEAD

COMPRESS

HINGE PIN TO

REMOVE

ICE

THICKNESS

PROBE

Maintenance Section 3

3-12 Part No. 80-1100-3

Water Level Probe

1. Loosen the screw that holds the water level probe in

place. The probe can easily be cleaned at this point

without proceeding to step 2.

2. If complete removal is required, disconnect the wire

lead from the control board inside the electrical

control box.

Figure 3-11. Water Level Probe Removal

Water Inlet Valve

The water inlet valve normally does not require removal

for cleaning. Follow the instructions below to determine if

removal is necessary.

1. Set the ICE/OFF/CLEAN switch to OFF. Locate the

water inlet valve (in the compressor area of the ice

machine). It pours water into the water trough.

2. When the ice machine is off, the water inlet valve

must completely stop water flow into the machine.

Watch for water flow. If water flows, remove,

disassemble and clean the valve.

3. When the ice machine is on, the water inlet valve

must allow the proper water flow through it. Set the

toggle switch to ON. Watch for water flow into the ice

machine. If the water flow is slow or only trickles into

the ice machine, remove, disassemble, and clean

the valve.

Follow the procedure below to remove the water inlet

valve.

1. Remove the valve shield if necessary.

2. Remove the filter access screws that hold the valve

in place.

NOTE: The water inlet valve can be disassembled and

cleaned without disconnecting the incoming water

supply line to the ice machine.

3. Remove, clean, and install the filter screen.

4. If necessary, remove the enclosure tube access

screws to clean interior components.

Figure 3-12. Water Inlet Valve Removal

Figure 3-13. Exploded View of Water Inlet Valve

Warning

Disconnect the electrical power to the ice machine

at the electrical disconnect before proceeding.

SCREW

WATER

LEVEL

PROBE

SV1621

WATER

TROUGH WIRE

LEAD

ICE

MACHINE

SIDE

PANEL

Warning

Disconnect the electric power to the ice machine at

the electric service switch box and turn off the water

supply before proceeding.

SV1622

FILTER

ACCESS

SCREWS

INCOMING

WATER

LINE WATER

INLET

VALVE

SV1623

ENCLOSURE TUBE

ACCESS SCREWS

ELECTRICAL

SOLENOID

RESTRICTOR

(FLAT SIDE MUST

FACE OUT)

MOUNTING

PLATE

FILTER

ACCESS

SCREWS

FITTING

O-RING

ENCLOSURE

TUBE

SPRING

RUBBER

SEAL

VALVE

BODY

FILTER

SCREEN

Section 3 Maintenance

Part No. 80-1100-3 3-13

Water Distribution Tube

1. Disconnect the water hose from the distribution

tube.

Figure 3-14. Water Distribution Tube Removal

1. Loosen the two thumbscrews which secure the

distribution tube.

2. Lift the right side of the distribution tube up off the

locating pin, then slide it back and to the right.

3. Disassemble for cleaning.

A. Twist both of the inner tube ends until the tabs

line up with the keyways.

B. Pull the inner tube ends outward.

Figure 3-15. Water Distribution Tube Disassembly

Water Curtain

1. Gently flex the curtain in the center and remove it

from the right side.

Figure 3-16. Water Curtain Removal

2. Slide the left pin out.

Caution

Do not force this removal. Be sure the locating pin is

clear of the hole before sliding the distribution tube

out.

SV1620

1. LIFT UP

2. SLIDE BACK

3. SLIDE TO RIGHT

DISTRIBUTION

TUBE

THUMBSCREW

LOCATING

SV1211

INNER TUBE

TAB

KEYWAY

INNER TUBE

SV1213

STEP 1

STEP 2

Maintenance Section 3

3-14 Part No. 80-1100-3

Water Treatment/Filtration

GENERAL

Local water conditions may require the installation of a

water treatment system to inhibit scale formation, filter

out sediment, and remove chlorine taste and odor.

Consult your local distributor for information on

Manitowoc’s full line of NSF-certified Tri-Liminator

filtration systems.

FILTER REPLACEMENT PROCEDURE

Tri-Liminator systems include a pre-filter and a primary

filter. For maximum filtration efficiency, replace the

primary filter cartridge every six months. If the filter

gauge reading drops below 20 psig prior to six months

usage, replace the pre-filter first.

1. Turn off the water supply at the inlet shutoff valve.

Figure 3-17. Typical Tri-Liminator

Water Filtration System

2. Depress the pressure release button to relieve the

pressure.

3. Unscrew the housing from the cap.

4. Remove the used filter cartridge from the housing

and discard it.

5. Remove the O-ring from the housing groove. Wipe

the housing groove and the O-ring clean.

6. Lubricate the O-ring with petroleum jelly.

7. Press the O-ring into the housing groove.

8. Insert a new filter cartridge into the housing. Make

sure it slips down over the housing standpipe.

9. Screw the housing on to the cap and carefully hand-

tighten it.

10. Repeat steps 3-9 for each filter housing.

11. Turn on the water supply to allow the housing and

filter to slowly fill with water.

12. Depress the pressure release button to release

trapped air from the housing.

13. Check for leaks.

CAP

CARTRIDGE

SEAL

PRESSURE

RELEASE BUTTON

PRE-FILTER

PRIMARY

FILTER

OUTLET SIDE

O-RING

SHUT OFF

VALVE

SEAL

HOUSING

INLET SIDE

Caution

Hand-tighten only. Do not overtighten. Do not use a

spanner wrench.

Section 3 Maintenance

Part No. 80-1100-3 3-15

Removal from Service/Winterization

GENERAL

Special precautions must be taken if the ice machine is

to be removed from service for an extended period of

time or exposed to ambient temperatures of 32°F (0°C)

or below.

Follow the applicable procedure below.

SELF-CONTAINED AIR-COOLED ICE MACHINES

1. Disconnect the electric power at the circuit breaker

or the electric service switch.

2. Turn off the water supply.

3. Remove the water from the water trough.

4. Disconnect and drain the incoming ice-making water

line at the rear of the ice machine.

5. Blow compressed air in both the incoming water and

the drain openings in the rear of the ice machine

until no more water comes out of the inlet water lines

or the drain.

6. Make sure water is not trapped in any of the water

lines, drain lines, distribution tubes, etc.

WATER-COOLED ICE MACHINES

1. Perform steps 1-6 under “Self-Contained Air-Cooled

Ice Machines.”

2. Disconnect the incoming water and drain lines from

the water-cooled condenser.

3. Insert a large screwdriver between the bottom spring

coils of the water regulating valve. Pry upward to

open the valve.

Figure 3-18. Pry Open the Water Regulating Valve

4. Hold the valve open and blow compressed air

through the condenser until no water remains.

REMOTE ICE MACHINES

1. Move the ICE/OFF/CLEAN switch to OFF.

2. “Frontseat” (shut off) the receiver service valves.

Hang a tag on the switch as a reminder to open the

valves before restarting.

3. Perform steps 1-6 under “Self-Contained Air-Cooled

Ice Machines.”

AUCS Accessory

Refer to the AuCS Accessory manual for winterization

of the AuCS Accessory.

Caution

If water is allowed to remain in the ice machine in

freezing temperatures, severe damage to some

components could result. Damage of this nature is

not covered by the warranty.

SV1624

Maintenance Section 3

3-16 Part No. 80-1100-3

THIS PAGE INTENTIONALLY LEFT BLANK

Part No. 80-1100-3 4-1

Section 4

Ice Machine Sequence of Operation

Self-Contained Air- and Water-Cooled

Q200/Q280/Q320/Q370/Q420/Q450/Q600/Q800/Q1000/Q1300/Q1600/Q1800

INITIAL START-UP OR START-UP AFTER

AUTOMATIC SHUT-OFF

1. Water Purge

Before the compressor starts, the water pump and water

dump solenoid are energized for 45 seconds, to

completely purge the ice machine of old water. This

feature ensures that the ice making cycle starts with

fresh water.

The harvest valve(s) is also energized during water

purge, although it stays on for an additional 5 seconds

(50 seconds total on time) during the initial refrigeration

system start-up.

2. Refrigeration System Start-Up

The compressor starts after the 45 second water purge,

and it remains on throughout the entire Freeze and

Harvest Sequences. The water fill valve is energized at

the same time as the compressor. It remains on until the

water level sensor closes for 3 continuous seconds, or

until a six-minute time period has expired. (See “Water

Inlet Valve Safety Shutoff,” Page 6-50.) The harvest

valve(s) remains on for 5 seconds during initial

compressor start-up and then shuts off.

At the same time the compressor starts, the condenser

fan motor (air-cooled models) is supplied with power

throughout the entire Freeze and Harvest Sequences.

The fan motor is wired through a fan cycle pressure

control, therefore it may cycle on and off. (The

compressor and condenser fan motor are wired through

the contactor. As a result, anytime the contactor coil is

energized, the compressor and fan motor are supplied

with power.)

FREEZE SEQUENCE

3. Prechill

The compressor is on for 30 seconds prior to water flow,

to prechill the evaporator.

4. Freeze

The water pump restarts after the 30 second prechill. An

even flow of water is directed across the evaporator and

into each cube cell, where it freezes. The water fill valve

will cycle on and then off one more time to refill the water

trough.

When sufficient ice has formed, the water flow (not the

ice) contacts the ice thickness probe. After

approximately 7 seconds of continual water contact, the

harvest sequence is initiated. The ice machine cannot

initiate a harvest sequence until a 6 minute freeze lock

has been surpassed.

Figure 4-1. Freeze Sequence

(Typical Q450 Shown)

Continued on next page …

Ice Machine Sequence of Operation Section 4

4-2 Part No. 80-1100-3

HARVEST SEQUENCE

5. Water Purge

The water pump continues to run, and the water dump

valve energizes for 45 seconds to purge the water in the

sump trough. The water fill valve energizes (turns on)

and de-energizes (turns off) strictly by time. The water fill

valve energizes for the last 15 seconds of the 45-second

water purge. The water purge must be at the factory

setting of 45 seconds for the fill valve to energize during

the last 15 seconds of the Water Purge. If set at less

than 45 seconds the water fill valve does not energize

during the water purge.

After the 45 second water purge, the water fill valve,

water pump and dump valve de-energize. (Refer to

“Water Purge Adjustment” on Page 3-3 for details.) The

harvest valve also opens at the beginning of the water

purge to divert hot refrigerant gas into the evaporator.

6. Harvest

The harvest valve(s) remains open and the refrigerant

gas warms the evaporator causing the cubes to slide, as

a sheet, off the evaporator and into the storage bin. The

sliding sheet of cubes swings the water curtain out,

opening the bin switch. The momentary opening and re-

closing of the bin switch terminates the harvest

sequence and returns the ice machine to the freeze

sequence (Step 3 - 4.)

Figure 4-2. Harvest Sequence (Typical Q450 Shown)

AUTOMATIC SHUT-OFF

7. Automatic Shut-Off

When the storage bin is full at the end of a harvest

sequence, the sheet of cubes fails to clear the water

curtain and will hold it open. After the water curtain is

held open for 7 seconds, the ice machine shuts off. The

ice machine remains off for 3 minutes before it can

automatically restart.

The ice machine remains off until enough ice has been

removed from the storage bin to allow the ice to fall clear

of the water curtain. As the water curtain swings back to

the operating position, the bin switch re-closes and the

ice machine restarts (steps 1 - 2), provided the 3 minute

delay period is complete.

Figure 4-3. Automatic Shut-Off (Typical Q450

Shown)

Section 4 Ice Machine Sequence of Operation

Part No. 80-1100-3 4-3

Remote

Q450/Q600/Q800/Q1000/Q1300/Q1600/Q1800

INITIAL START-UP OR START-UP AFTER

AUTOMATIC SHUT-OFF

1. Water Purge

Before the compressor starts, the water pump and water

dump solenoid are energized for 45 seconds, to

completely purge the ice machine of old water. This

feature ensures that the ice making cycle starts with

fresh water.

The harvest valve and harvest pressure regulating

(HPR) solenoid valves also energize during water purge,

although they stay on for an additional 5 seconds (50

seconds total on time) during the initial refrigeration

system start-up.

2. Refrigeration System Start-Up

The compressor and liquid line solenoid valve energize

after the 45 second water purge and remain on

throughout the entire Freeze and Harvest Sequences.

The water fill valve is energized at the same time as the

compressor. It remains on until the water level sensor

closes for 3 continuous seconds, or until a six-minute

time period has expired. (See “Water Inlet Valve Safety

Shutoff,” Page 6-50.). The harvest valve and HPR

solenoid valves remain on for 5 seconds during initial

compressor start-up and then shut off.

The remote condenser fan motor starts at the same time

the compressor starts and remains on throughout the

entire Freeze and Harvest Sequences. (The compressor

and condenser fan motor are wired through the

contactor, therefore, anytime the contactor coil is

energized, the compressor and fan motor are on.)

FREEZE SEQUENCE

3. Prechill

The compressor is on for 30 seconds prior to water flow,

to prechill the evaporator.

4. Freeze

The water pump restarts after the 30 second prechill. An

even flow of water is directed across the evaporator and

into each cube cell, where it freezes. The water fill valve

will cycle on and then off one more time to refill the water

trough. (See Page 4-1.)

When sufficient ice has formed, the water flow (not the

ice) contacts the ice thickness probe. After

approximately 7 seconds of continual water contact, the

harvest sequence is initiated. The ice machine cannot

initiate a harvest sequence until a 6 minute freeze lock

has been surpassed.

Figure 4-4. Freeze Sequence (Typical Q450 Shown)

Continued on next page …

Ice Machine Sequence of Operation Section 4

4-4 Part No. 80-1100-3

HARVEST SEQUENCE

5. Water Purge

The water pump continues to run, and the water dump

valve energizes for 45 seconds to purge the water in the

sump trough. The water fill valve energizes (turns on)

and de-energizes (turns off) strictly by time. The water fill

valve energizes for the last 15 seconds of the 45-second

water purge. The water purge must be at the factory

setting of 45 seconds for the fill valve to energize during

the last 15 seconds of the Water Purge. If set at less

than 45 seconds the water fill valve does not energize

during the water purge.

After the 45 second water purge, the water fill valve,

water pump and dump valve de-energize. (Refer to

“Water Purge Adjustment” on Page 3-3 for details.) The

harvest valve(s) and HPR solenoid valve also open at

the beginning of the water purge.

6. Harvest

The HPR valve and the harvest valve(s) remain open

and the refrigerant gas warms the evaporator causing

the cubes to slide, as a sheet, off the evaporator and into

the storage bin. The sliding sheet of cubes swings the

water curtain out, opening the bin switch. The

momentary opening and re-closing of the bin switch

terminates the harvest sequence and returns the ice

machine to the freeze sequence (Step 3 - 4.)

Figure 4-5. Harvest Sequence (Typical Q450 Shown)

AUTOMATIC SHUT-OFF

7. Automatic Shut-Off

When the storage bin is full at the end of a harvest

sequence, the sheet of cubes fails to clear the water

curtain and will hold it open. After the water curtain is

held open for 7 seconds, the ice machine shuts off. The

ice machine remains off for 3 minutes before it can

automatically restart.

The ice machine remains off until enough ice has been

removed from the storage bin to allow the ice to drop

clear of the water curtain. As the water curtain swings

back to the operating position, the bin switch re-closes

and the ice machine restarts (steps 1 - 2) provided the 3

minute delay period is complete.

Figure 4-6. Automatic Shut-Off (Typical Q450

Shown)

Part No. 80-1100-3 5-1

Section 5

Water System Ice Making Sequence of Operation

NOTE: The sequence of operation is the same for self-

contained and remote models.

INITIAL START-UP OR START-UP AFTER

AUTOMATIC SHUT-OFF

1. Before the ice machine starts, the water pump and

water dump solenoid are energized for 45 seconds

to purge old water from the water trough. This

ensures that the ice-making cycle starts with fresh

water. The water fill valve energizes after the 45-

second water purge, and remains on until the water

level probe is satisfied.

FREEZE CYCLE

2. To pre-chill the evaporator, there is no water flow

over the evaporator for the first 30 seconds of the

freeze cycle.

3. The water pump starts after the 30-second pre-chill.

An even flow of water is directed across the

evaporator and into each cube cell.

During the first 45 seconds of the Freeze Cycle, the

water fill valve cycles on and off as many times as

needed to refill the water trough.

After the 45 seconds, the water fill valve cycles on

and off one more time to refill the water trough. The

water fill valve then remains off for the duration of

the Freeze Cycle.

WATER INLET VALVE SAFETY SHUT-OFF

This feature limits the water inlet valve to a six-minute on

time. Regardless of the water level probe input, the

control board automatically shuts off the water inlet valve

if it remains on for 6 continuous minutes.

Figure 5-1. Water Flow Over the Evaporator

SV1677

TO DRAIN

WATER DUMP VALVE

TO DISTRIBUTION TUBE

WATER PUMP

WATER INLET VALVE

Water System Ice Making Sequence of Operation Section 5

5-2 Part No. 80-1100-3

HARVEST CYCLE

4. The water pump and water dump solenoid are

energized for 45 seconds to purge the water from

the water trough. The water fill valve energizes for

the last 15 seconds of the 45-second purge cycle, to

flush sediment from the bottom of the water trough.

5. After the 45-second purge, the water pump and

water dump valve de-energize.

AUTOMATIC SHUT-OFF

There is no water flow during an automatic shut-off.

Figure 5-2. Water Flow Down the Drain

SV1677

TO DRAIN

WATER DUMP VALVE

TO DISTRIBUTION TUBE

WATER PUMP

WATER INLET VALVE

Part No. 80-1100-3 6-1

Section 6

Electrical System

Energized Parts Charts

SELF-CONTAINED AIR- AND WATER-COOLED MODELS

1. Initial Start-Up or Start-Up After Automatic Shut-Off

Condenser Fan Motor

The fan motor is wired through a fan cycle pressure

control, therefore, it may cycle on and off.

Harvest Water Purge

The circuit board has an adjustable water purge in the

harvest cycle. This permits a 15, 30 or 45 second purge

cycle.

Auto Shut-Off

The ice machine remains off for 3 minutes before it can

automatically restart. The ice machine restarts (steps 1-

2) immediately after the delay period, if the bin switch re-

closes prior to 3 minutes.

Safety Timers

The control board has the following non-adjustable

safety timers:

FREEZE SEQUENCE

• The ice machine is locked into the freeze cycle for

the first 6 minutes, not allowing the ice thickness

probe to initiate a harvest sequence.

• The maximum freeze time is 60 minutes, at which

time the control board automatically initiates a

harvest sequence (steps 5-6).

HARVEST SEQUENCE

The maximum harvest time is 3-1/2 minutes, at which

time the control board automatically terminates the

harvest sequence. If the bin switch is open, the ice

machine will go to automatic shut-off (step 7). If the bin

switch is closed, the ice machine will go to the freeze

sequence (steps 3-4).

Ice Making

Sequence Of

Operation

Control Board Relays Contactor

Length

Of Time

1 2 3 4 5 5A 5B

Water

Pump Water Fill

Valve Harvest

Valve(s)

Water

Dump

Valve

Contactor

Coil Com-

pressor Condenser

Fan Motor

START-UP 1

1. Water Purge On Off On On Off Off Off 45 Seconds

2. Refrigeration

System

Start-Up Off On On Off On On May Cycle

On/Off 5 Seconds

FREEZE

SEQUENCE

3. Pre-Chill Off May cycle On/

Off during first

45 sec.

-----------

Cycles On,

then Off 1

more time

Locked Out

After Six

Minutes

Off Off On On May Cycle

On/Off 30 Seconds

4. Freeze On Off Off On On May Cycle

On/Off

Until 7 sec.

water contact

with ice

thickness probe

HARVEST

SEQUENCE

5. Water Purge On 30 sec. Off,

15 sec. On On On On On May Cycle

On/Off Factory-set at

45 Seconds

6. Harvest Off Off On Off On On May Cycle

On/Off Bin switch

activation

7. AUTOMATIC

SHUT-OFF Off Off Off Off Off Off Off Until bin switch

re-closes

Electrical System Section 6

6-2 Part No. 80-1100-3

REMOTE MODELS

1. Initial Start-Up or Start-Up After Automatic Shut-Off

Auto Shut-Off

The ice machine remains off for 3 minutes before it can

automatically restart. The ice machine restarts (steps 1-

2) immediately after the delay period, if the bin switch re-

closes prior to 3 minutes.

Harvest Water Purge

The circuit board has an adjustable water purge in the

harvest cycle. This permits a 15, 30 or 45 second purge

cycle.

Safety Timers

The control board has the following non-adjustable

safety timers:

FREEZE SEQUENCE

• The ice machine is locked into the freeze cycle for

the first 6 minutes, not allowing the ice thickness

probe to initiate a harvest sequence.

• The maximum freeze time is 60 minutes, at which

time the control board automatically initiates a

harvest sequence (steps 5-6).

HARVEST SEQUENCE

• The maximum harvest time is 3-1/2 minutes, at which

time the control board automatically terminates the

harvest sequence. If the bin switch is open, the ice

machine will go to automatic shut-off (step 7). If the

bin switch is closed, the ice machine will go to the

freeze sequence (steps 3-4).

Ice Making

Sequence Of

Operation

Control Board Relays Contactor

Length

Of Time

1 2 3 4 5 5A 5B

Water

Pump Water Fill

Valve

a. Harvest

Valve(s) Water

Dump

Valve

Contactor

Coil Com-

pressor Condenser

Fan Motor

b. HPR

Solenoid

b. Liquid

Line

Solenoid

START-UP 1

1. Water Purge On Off On On Off Off Off 45 Seconds

2. Refrigeration

System

Start-Up Off On On Off On On On 5 Seconds

FREEZE

SEQUENCE

3. Pre-Chill Off May cycle

On/Off during

first 45 sec.

------------

Cycles On,

then Off 1

more time

Locked Out

After Six

Minutes

Off Off On On On 30 Seconds

4. Freeze On Off Off On On On

Until 7 sec.

water

contact with

ice thickness

probe

HARVEST

SEQUENCE

5. Water Purge On 30 sec. Off,

15 sec. On On On On On On Factory-set

at 45

Seconds

6. Harvest Off Off On Off On On On Bin switch

activation

7. AUTOMATIC

SHUT-OFF Off Off Off Off Off Off Off Until bin

switch re-

closes

Section 6 Electrical System

Part No. 80-1100-3 6-3

Wiring Diagram Sequence of

Operation

SELF-CONTAINED MODELS

Initial Start-Up or Start-Up After

Automatic Shut-Off

1. WATER PURGE

Before the compressor starts, the

water pump and water dump

solenoid are energized for 45

seconds to purge old water from the

ice machine. This ensures that the

ice-making cycle starts with fresh

water.

The harvest valve(s) is also

energized during the water purge. In

the case of an initial refrigeration

start-up, it stays on for an additional

5 seconds (50 seconds total).

Figure 6-1. Self-Contained — Water Purge

Table 6-1. Self-Contained Models

1. Water Purge (45 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Closed / ON

#2 Water Fill Valve Open / OFF

#3 Harvest Solenoid Closed / ON

#4 Water Dump Valve Closed / ON

#5 Contactor Coil Open / OFF

Compressor OFF

Condenser Fan Motor OFF

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

*OVERLOAD

FAN CYCLE CONTROL

BIN SWITCH

TB35

TB33 (52)

(51)

(48)

CONTACTOR

CONTACTS

(42)

(66)

(64)

ICE THICKNESS PROBE

WATER LEVEL PROBE

NOT USED

B35

HIGH PRES

CUTOUT

TB32

(55)

RUN CAPACITOR

RUN CAPACITOR**

TB34

(53)

(47)

(85) (86)

COMPRESSOR

FAN MOTOR

(AIR COOLED ONLY)

(45)

(46) (50)

PTCR

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

CLEAN LIGHT

WATER LEVEL

(49)

(63)

(62)

(66)

(65)

(69) ICE

OFF

CLEAN

(67) (68)

LOW D.C.

VOLTAGE

PLUG

(62)

TOGGLE SWITCH

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB37

(74)

(59)

(73)

(56) CONTACTOR

COIL

TERMINATES AT

PIN CONNECTION

TB3

TB30

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(58)

FUSE (7A)

TRANS.

(61)

(60)

TB31

(76)

(98)

(57)

(99)

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

(77)

(80)

(21) (22)

WATER

VALVE

TB30

(20)

SV1646-1

Electrical System Section 6

6-4 Part No. 80-1100-3

2. REFRIGERATION SYSTEM

START-UP

The compressor starts after the 45-

second water purge, and it remains

on throughout the Freeze and

Harvest cycles.

The water fill valve is energized at

the same time as the compressor. It

remains on until the water level

sensor closes for 3 continuous

seconds.

The harvest valve(s) remains on for

the first 5 seconds of the initial

compressor start-up.

At the same time the compressor

starts, the condenser fan motor (air-

cooled models) is supplied with

power. It continues to be supplied

with power throughout the Freeze

and Harvest cycles.

The fan motor is wired through a fan

cycle pressure control, and may

cycle on and off. (The compressor

and the condenser fan motor are

wired through the contactor. Any time

the contactor coil is energized, these

components are supplied with

power.)

Figure 6-2. Self-Contained — Refrigeration System Start-Up

Table 6-2. Self-Contained Models

2. Refrigeration System Start Up (5 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Closed / ON

#3 Harvest Solenoid Closed / ON

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

*OVERLOAD

FAN CYCLE CONTROL

BIN SWITCH

TB35

TB33 (52)

(51)

(48)

CONTACTOR

CONTACTS

(42)

(66)

(64)

ICE THICKNESS PROBE

WATER LEVEL PROBE

NOT USED

B35

HIGH PRES

CUTOUT

TB32

(55)

RUN CAPACITOR

RUN CAPACITOR**

TB34

(53)

(47)

(85) (86)

COMPRESSOR

FAN MOTOR

(AIR COOLED ONLY)

(45)

(46) (50)

PTCR

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

CLEAN LIGHT

WATER LEVEL

(49)

(63)

(62)

(66)

(65)

(69) ICE

OFF

CLEAN

(67) (68)

LOW D.C.

VOLTAGE

PLUG

(62)

TOGGLE SWITCH

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB37

(74)

(59)

(73)

(56) CONTACTOR

COIL

TERMINATES AT

PIN CONNECTION

TB3

TB30

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(58)

FUSE (7A)

TRANS.

(61)

(60)

TB31

(76)

(98)

(57)

(99)

(75)

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

(77)

(80)

HARVEST

(21) (22)

WATER

VALVE

TB30

(20)

SV1646-2

Section 6 Electrical System

Part No. 80-1100-3 6-5

Freeze Sequence

3. PRE-CHILL

To pre-chill the evaporator, the

compressor runs for 30 seconds prior

to water flow.

The water fill valve remains on until

the water level sensor closes for

three continuous seconds.

Figure 6-3. Self-Contained — Pre-Chill

Table 6-3. Self-Contained Models

3. Pre-Chill (30 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Closed / ON

#3 Harvest Solenoid Open / OFF

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

*OVERLOAD

FAN CYCLE CONTROL

BIN SWITCH

TB35

TB33 (52)

(51)

(48)

CONTACTOR

CONTACTS

(42)

(66)

(64)

ICE THICKNESS PROBE

WATER LEVEL PROBE

NOT USED

B35

HIGH PRES

CUTOUT

TB32

(55)

RUN CAPACITOR

RUN CAPACITOR**

TB34

(53)

(47)

(85) (86)

COMPRESSOR

FAN MOTOR

(AIR COOLED ONLY)

(45)

(46) (50)

PTCR

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

CLEAN LIGHT

WATER LEVEL

(49)

(63)

(62)

(66)

(65)

(69) ICE

OFF

CLEAN

(67) (68)

LOW D.C.

VOLTAGE

PLUG

(62)

TOGGLE SWITCH

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB37

(74)

(59)

(73)

(56) CONTACTOR

COIL

TERMINATES AT

PIN CONNECTION

TB3

TB30

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(58)

FUSE (7A)

TRANS.

(61)

(60)

TB31

(76)

(98)

(57)

(99)

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

(77)

(80)

(21) (22)

WATER

VALVE

TB30

(20)

SV1646-3

Electrical System Section 6

6-6 Part No. 80-1100-3

4. FREEZE

The water pump starts after the 30-

second pre-chill. An even flow of

water is directed across the

evaporator and into each cube cell,

where it freezes.

After six minutes the water inlet valve

is locked out and can not add

additional water.

When sufficient ice has formed, the

water flow (not the ice) contacts the

ice thickness probes. After

approximately 7 seconds of continual

contact, a harvest cycle is initiated.

NOTE: The ice machine cannot

initiate a harvest cycle until a 6-

minute freeze lock has expired.

Figure 6-4. Self-Contained — Freeze

Table 6-4. Self-Contained Models

4. Freeze (Until 7 Seconds of Water Contact with Ice Thickness Probe)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Closed / ON

#2 Water Fill Valve Cycles ON then OFF

#3 Harvest Solenoid Open / OFF

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

*OVERLOAD

FAN CYCLE CONTROL

BIN SWITCH

TB35

TB33 (52)

(51)

(48)

CONTACTOR

CONTACTS

(42)

(66)

(64)

ICE THICKNESS PROBE

WATER LEVEL PROBE

NOT USED

B35

HIGH PRES

CUTOUT

TB32

(55)

RUN CAPACITOR

RUN CAPACITOR**

TB34

(53)

(47)

(85) (86)

COMPRESSOR

FAN MOTOR

(AIR COOLED ONLY)

(45)

(46) (50)

PTCR

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

CLEAN LIGHT

WATER LEVEL

(49)

(63)

(62)

(66)

(65)

(69) ICE

OFF

CLEAN

(67) (68)

LOW D.C.

VOLTAGE

PLUG

(62)

TOGGLE SWITCH

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB37

(74)

(59)

(73)

(56) CONTACTOR

COIL

TERMINATES AT

PIN CONNECTION

TB3

TB30

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(58)

FUSE (7A)

TRANS.

(61)

(60)

TB31

(76)

(98)

(57)

(99)

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

(77)

(80)

(21) (22)

WATER

VALVE

TB30

(20)

SV1646-4

Section 6 Electrical System

Part No. 80-1100-3 6-7

Harvest Sequence

5. WATER PURGE

The water pump continues to run,

and the water dump valve energizes

for 45 seconds to purge the water in

the sump trough. The water fill valve

energizes (turns on) and de-

energizes (turns off) strictly by time.

The water fill valve energizes for the

last 15 seconds of the 45-second

water purge. The water purge must

be at the factory setting of 45

seconds for the fill valve to energize

during the last 15 seconds of the

Water Purge. If set at less than 45

seconds, the water fill valve does not

energize during the water purge.

After the 45 second water purge, the

water fill valve, water pump and

dump valve de-energize. (Refer to

“Water Purge Adjustment” on Page

3-3 for details.) The harvest valve

also opens at the beginning of the

water purge to divert hot refrigerant

gas into the evaporator.

Figure 6-5. Self-Contained — Water Purge

Table 6-5. Self-Contained Models

5. Water Purge (45 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Closed / ON

#2 Water Fill Valve Cycles OFF then ON

#3 Harvest Solenoid Closed / ON

#4 Water Dump Valve Closed / ON

#5 Contactor Coil Closed / ON

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

*OVERLOAD

FAN CYCLE CONTROL

BIN SWITCH

TB35

TB33 (52)

(51)

(48)

CONTACTOR

CONTACTS

(42)

(66)

(64)

ICE THICKNESS PROBE

WATER LEVEL PROBE

NOT USED

B35

HIGH PRES

CUTOUT

TB32

(55)

RUN CAPACITOR

RUN CAPACITOR**

TB34

(53)

(47)

(85) (86)

COMPRESSOR

FAN MOTOR

(AIR COOLED ONLY)

(45)

(46) (50)

PTCR

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

CLEAN LIGHT

WATER LEVEL

(49)

(63)

(62)

(66)

(65)

(69) ICE

OFF

CLEAN

(67) (68)

LOW D.C.

VOLTAGE

PLUG

(62)

TOGGLE SWITCH

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB37

(74)

(59)

(73)

(56) CONTACTOR

COIL

TERMINATES AT

PIN CONNECTION

TB3

TB30

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(58)

FUSE (7A)

TRANS.

(61)

(60)

TB31

(76)

(98)

(57)

(99)

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

(77)

(80)

(21)

WATER

VALVE

(22)

TB30

(20)

SV1646-5

Electrical System Section 6

6-8 Part No. 80-1100-3

6. HARVEST

The harvest valve(s) remains open,

allowing refrigerant gas to warm the

evaporator. This causes the cubes to

slide, as a sheet, off the evaporator

and into the storage bin.

The sliding sheet of cubes swings the

water curtain out, opening the bin

switch. This momentary opening and

closing of the bin switch terminates

the Harvest Cycle and returns the ice

machine to the Freeze Cycle (steps

3-4).

Figure 6-6. Self-Contained — Harvest

Table 6-6. Self-Contained Models

6. Harvest (Until Bin Switch Activation)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Open / OFF

#3 Harvest Solenoid Closed / ON

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

*OVERLOAD

FAN CYCLE CONTROL

BIN SWITCH

TB35

TB33 (52)

(51)

(48)

CONTACTOR

CONTACTS

(42)

(66)

(64)

ICE THICKNESS PROBE

WATER LEVEL PROBE

NOT USED

B35

HIGH PRES

CUTOUT

TB32

(55)

RUN CAPACITOR

RUN CAPACITOR**

TB34

(53)

(47)

(85) (86)

COMPRESSOR

FAN MOTOR

(AIR COOLED ONLY)

(45)

(46) (50)

PTCR

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

CLEAN LIGHT

WATER LEVEL

(49)

(63)

(62)

(66)

(65)

(69) ICE

OFF

CLEAN

(67) (68)

LOW D.C.

VOLTAGE

PLUG

(62)

TOGGLE SWITCH

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB37

(74)

(59)

(73)

(56) CONTACTOR

COIL

TERMINATES AT

PIN CONNECTION

TB3

TB30

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(58)

FUSE (7A)

TRANS.

(61)

(60)

TB31

(76)

(98)

(57)

(99)

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

(77)

(80)

(21) (22)

WATER

VALVE

TB30

(20)

SV1646-6

Section 6 Electrical System

Part No. 80-1100-3 6-9

Automatic Shut-Off

7. AUTOMATIC SHUT-OFF

If the storage bin is full at the end of a

harvest cycle, the sheet of cubes fails

to clear the water curtain and holds it

open. After the water curtain is held

open for 7 seconds, the ice machine

shuts off.

The ice machine remains off until

enough ice is removed from the

storage bin to allow the sheet of

cubes to drop clear of the water

curtain. As the water curtain swings

back to the operating position, the bin

switch closes and the ice machine

restarts (steps 1-2).

NOTE: The ice machine must remain

off for 3 minutes before it can

automatically restart.

Figure 6-7. Self-Contained — Automatic Shut-Off

Table 6-7. Self-Contained Models

7. Automatic Shut-Off (Until Bin Switch Closes)

Toggle Switch ICE

Bin Switch Open

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Open / OFF

#3 Harvest Solenoid Open / OFF

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Open / OFF

Compressor OFF

Condenser Fan Motor OFF

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

*OVERLOAD

FAN CYCLE CONTROL

BIN SWITCH

TB35

TB33 (52)

(48)

CONTACTOR

CONTACTS

(42)

(51)

(64)

(66)

ICE THICKNESS PROBE

WATER LEVEL PROBE

NOT USED

B35

HIGH PRES

CUTOUT

TB32

(55)

TB3

RUN CAPACITOR

RUN CAPACITOR**

TB34

(47)

(86)

COMPRESSOR

(53)

(85)

FAN MOTOR

(AIR COOLED ONLY)

(45)

(46) (50)

PTCR

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

CLEAN LIGHT

WATER LEVEL

(49)

(63)

(62)

(66)

(65)

(69)

(67) ICE

OFF

CLEAN

(68)

LOW D.C.

VOLTAGE

PLUG

(62)

TOGGLE SWITCH

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB37

(74)

(59)

(73)

(56) CONTACTOR

COIL

TERMINATES AT

PIN CONNECTION

TB3

TB30

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(58)

FUSE (7A)

TRANS.

(61)

(60)

TB31

(76)

(98)

(57)

(99)

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

(77)

(80)

(21) (22)

WATER

VALVE

TB30

(20)

SV1646-7

Electrical System Section 6

6-10 Part No. 80-1100-3

REMOTE MODELS

Initial Start-Up Or Start-Up After

Automatic Shut-Off

1. WATER PURGE

Before the compressor starts, the

water pump and water dump

solenoid are energized for 45

seconds to purge old water from the

ice machine. This ensures that the

ice-making cycle starts with fresh

water.

NOTE: The harvest valve and

harvest pressure regulating (HPR)

solenoid valve are also energized

during the water purge. In the case of

an initial refrigeration start-up, they

stay on for an additional 5 seconds

(50 seconds total).

Figure 6-8. Remote — Water Purge

Table 6-8. Remote Models

1. Water Purge (45 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Closed / ON

#2 Water Fill Valve Open / OFF

#3 Harvest Solenoid Closed / ON

Harvest Pressure Regulating (HPR) Solenoid Closed / ON

#4 Water Dump Valve Closed / ON

#5 Contactor Coil Open / OFF

Liquid Line Solenoid De-energized

Compressor OFF

Condenser Fan Motor OFF

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

TERMINATES AT

PIN CONNECTION

*OVERLOAD

BIN SWITCH

ICE THICKNESS PROBE

(F1)

TB33 (52)

(51)

(48)

B35 L1

(42)

CONTACTOR

CONTACTS

(66)

WATER LEVEL PROBE

NOT USED

(64)

TB32

B35

(55)

HIGH PRES

CUTOUT

(74)

(73)

REMOTE

FAN MOTOR

RUN CAPACITOR

PTCR

TB34

(53)

REMOTE CONDENSER

(F2)

(45)

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

RUN CAPACITOR

TOGGLE SWITCH

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL

ICE

(68)

R(46)

(49)

(47)

COMPRESSOR

(62)

(66) (69)

(67)

OFF

CLEAN

LOW D.C.

VOLTAGE

PLUG

(63)

(65)

(62)

RR(50) TB3

(56) TB3

TB3

CONTACTOR

COIL

VIEW FOR WIRING

(57)

(58)

FUSE (7A)

TRANS.

(61)

(60)

HARVEST (80)

TB31

TB37

(76)

(98)

(59)

(99)

SOLENOID

DUMP

SOLENOID

WATER

PUMP

SOLENOID

TB3

(82)

(83)

(81)

(75)

LIQUID LINE

(77)

HPR

SOLENOID

(79)(78)

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(22)(21)

WATER

VALVE

(20)

SV1648-1

Section 6 Electrical System

Part No. 80-1100-3 6-11

2. REFRIGERATION SYSTEM

START-UP

The compressor, remote condenser

fan motor and liquid line solenoid

valve energize after the 45-second

water purge, and remain on

throughout the Freeze and Harvest

cycles.

The water fill valve is energized at

the same time as the compressor. It

remains on until the water level

sensor closes for 3 continuous

seconds.

The harvest valve and harvest

pressure regulating (HPR) solenoid

valve remain on for the first 5

seconds of the initial compressor

start-up.

NOTE: (The compressor and the

condenser fan motor are wired

through the contactor. Any time the

contactor coil is energized, these

components are supplied with

power.)

Figure 6-9. Remote — Refrigeration System Start-Up

Table 6-9. Remote Models

2. Refrigeration System Start-Up (5 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Closed / ON

#3 Harvest Solenoid Closed / ON

Harvest Pressure Regulating (HPR) Solenoid Closed / ON

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Liquid Line Solenoid Energized

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

TERMINATES AT

PIN CONNECTION

*OVERLOAD

BIN SWITCH

ICE THICKNESS PROBE

(F1)

TB33 (52)

(51)

(48)

B35 L1

(42)

CONTACTOR

CONTACTS

(66)

WATER LEVEL PROBE

NOT USED

(64)

TB32

B35

(55)

HIGH PRES

CUTOUT

(74)

(73)

REMOTE

FAN MOTOR

RUN CAPACITOR

PTCR

TB34

(53)

REMOTE CONDENSER

(F2)

(45)

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

RUN CAPACITOR

TOGGLE SWITCH

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL

(68) ICE

R(46)

(49)

(47)

COMPRESSOR

(62)

(66) (69)

(67)

OFF

CLEAN

LOW D.C.

VOLTAGE

PLUG

(63)

(65)

(62)

RR(50) TB3

(56) COIL

VIEW FOR WIRING

TB3

CONTACTOR

TB3

(57)

(58)

FUSE (7A)

TRANS.

(61)

(60)

HARVEST (80)

TB31

TB37

(76)

(98)

(59)

(99)

SOLENOID

WATER

PUMP

SOLENOID

TB3

LIQUID LINE

(81)

(82)

(75)

DUMP

(83)

HPR

SOLENOID

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(22)(21)

WATER

VALVE

(77)

(79)(78)

(20)

SV1648-2

Electrical System Section 6

6-12 Part No. 80-1100-3

Freeze Sequence

3. PRE-CHILL

To pre-chill the evaporator, the

compressor runs for 30 seconds prior

to water flow.

NOTE: The water fill valve remains

on until the water level sensor closes

for three continuous seconds.

Figure 6-10. Remote — Pre-Chill

Table 6-10. Remote Models

3. Pre-Chill (30 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Closed / ON

#3 Harvest Solenoid Open / OFF

Harvest Pressure Regulating (HPR) Solenoid Open / OFF

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Liquid Line Solenoid Energized

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

TERMINATES AT

PIN CONNECTION

*OVERLOAD

BIN SWITCH

ICE THICKNESS PROBE

(F1)

TB33 (52)

(51)

(48)

B35 L1

(42)

CONTACTOR

CONTACTS

(66)

WATER LEVEL PROBE

NOT USED

(64)

TB32

B35

(55)

HIGH PRES

CUTOUT

(74)

(73)

REMOTE

FAN MOTOR

RUN CAPACITOR

PTCR

TB34

(53)

REMOTE CONDENSER

(F2)

(45)

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

RUN CAPACITOR

TOGGLE SWITCH

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL

(68) ICE

R(46)

(49)

(47)

COMPRESSOR

(62)

(66) (69)

(67)

OFF

CLEAN

LOW D.C.

VOLTAGE

PLUG

(63)

(65)

(62)

RR(50) TB3

(56) COIL

VIEW FOR WIRING

TB3

CONTACTOR

TB3

(57)

(58)

FUSE (7A)

TRANS.

(61)

(60)

HARVEST (80)

TB31

TB37

(76)

(98) (99)

(75)

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

SOLENOID

TB3

(82)

(59) (83)

LIQUID LINE

HPR

SOLENOID

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(22)(21)

WATER

VALVE

(77)

(79)(78)

(20)

SV1648-3

Section 6 Electrical System

Part No. 80-1100-3 6-13

4. FREEZE

The water pump starts after the 30-

second pre-chill. An even flow of

water is directed across the

evaporator and into each cube cell,

where it freezes.

After six minutes the water inlet valve

is locked out and can not add

additional water.

When sufficient ice has formed, the

water flow (not the ice) contacts the

ice thickness probes. After

approximately 7 seconds of continual

contact, a harvest cycle is initiated.

NOTE: The ice machine cannot

initiate a harvest cycle until a 6-

minute freeze lock has expired.

Figure 6-11. Remote — Freeze

Table 6-11. Remote Models

4. Freeze (Until 7 Seconds of Water Contact with Ice Thickness Probe)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Closed / ON

#2 Water Fill Valve Cycles / ON then OFF

#3 Harvest Solenoid Open / OFF

Harvest Pressure Regulating (HPR) Solenoid Open / OFF

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Liquid Line Solenoid Energized

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

TERMINATES AT

PIN CONNECTION

*OVERLOAD

BIN SWITCH

ICE THICKNESS PROBE

(F1)

TB33 (52)

(51)

(48)

B35 L1

(42)

CONTACTOR

CONTACTS

(66)

(64)

WATER LEVEL PROBE

NOT USED

TB32

B35

(55)

HIGH PRES

CUTOUT

(74)

(73)

REMOTE

FAN MOTOR

RUN CAPACITOR

PTCR

TB34

(53)

REMOTE CONDENSER

(F2)

(45)

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

RUN CAPACITOR

TOGGLE SWITCH

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL

(68) ICE

R(46)

(49)

(47)

COMPRESSOR

(62)

(66) (69)

(67)

OFF

CLEAN

LOW D.C.

VOLTAGE

PLUG

(63)

(65)

(62)

RR(50) TB3

(56) COIL

VIEW FOR WIRING

TB3

CONTACTOR

TB3

(57)

(58)

FUSE (7A)

TRANS.

(61)

(60)

HARVEST (80)

TB31

TB37

(76)

(98)

(59)

(99)

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

SOLENOID

TB3

(82)

(83)

LIQUID LINE

(75)

HPR

SOLENOID

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(22)(21)

WATER

VALVE

(77)

(79)(78)

(20)

SV1648-4

Electrical System Section 6

6-14 Part No. 80-1100-3

Harvest Sequence

5. WATER PURGE

The water pump continues to run,

and the water dump valve energizes

for 45 seconds to purge the water in

the sump trough. The water fill valve

energizes (turns on) and de-

energizes (turns off) strictly by time.

The water fill valve energizes for the

last 15 seconds of the 45-second

water purge. The water purge must

be at the factory setting of 45

seconds for the fill valve to energize

during the last 15 seconds of the

Water Purge. If set at less than 45

seconds the water fill valve does not

energize during the water purge.

NOTE: After the 45 second water

purge, the water fill valve, water

pump and dump valve de-energize.

(Refer to “Water Purge Adjustment”

on Page 3-3 for details.) The harvest

valve and HPR solenoid also open at

the beginning of the water purge to

divert hot refrigerant gas into the

evaporator.

Figure 6-12. Remote — Water Purge

Table 6-12. Remote Models

5. Water Purge (45 Seconds)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Closed / ON

#2 Water Fill Valve Cycles / OFF then ON

#3 Harvest Solenoid Closed / ON

Harvest Pressure Regulating (HPR) Solenoid Closed / ON

#4 Water Dump Valve Closed / ON

#5 Contactor Coil Closed / ON

Liquid Line Solenoid Energized

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

TERMINATES AT

PIN CONNECTION

*OVERLOAD

BIN SWITCH

ICE THICKNESS PROBE

(F1)

TB33 (52)

(51)

(48)

B35 L1

(42)

CONTACTOR

CONTACTS

(66)

(64)

WATER LEVEL PROBE

NOT USED

TB32

B35

(55)

HIGH PRES

CUTOUT

(74)

(73)

REMOTE

FAN MOTOR

RUN CAPACITOR

PTCR

TB34

(53)

REMOTE CONDENSER

(F2)

(45)

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

RUN CAPACITOR

TOGGLE SWITCH

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL

(68) ICE

R(46)

(49)

(47)

COMPRESSOR

(62)

(66) (69)

(67)

OFF

CLEAN

LOW D.C.

VOLTAGE

PLUG

(63)

(65)

(62)

RR(50) TB3

(56) COIL

VIEW FOR WIRING

TB3

CONTACTOR

TB3

(57)

(58)

FUSE (7A)

TRANS.

(61)

(60)

HARVEST (80)

TB31

TB37

(76)

(98) (99)

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

SOLENOID

TB3

(82)

(83)

(59)

(75)

LIQUID LINE

HPR

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(22)(21)

WATER

VALVE

(77)

(79)(78)

SOLENOID

(20)

SV1648-5

Section 6 Electrical System

Part No. 80-1100-3 6-15

6. HARVEST

The harvest valve(s) and HPR

solenoid valve remain open, allowing

refrigerant gas to warm the

evaporator. This causes the cubes to

slide, as a sheet, off the evaporator

and into the storage bin.

The sliding sheet of cubes swings the

water curtain out, opening the bin

switch. This momentary opening and

closing of the bin switch terminates

the Harvest Cycle and returns the ice

machine to the Freeze Cycle (steps

3-4).

Figure 6-13. Remote — Harvest

Table 6-13. Remote Models

6. Harvest (Until Bin Switch Activation)

Toggle Switch ICE

Bin Switch Closed

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Open / OFF

#3 Harvest Solenoid Closed / ON

Harvest Pressure Regulating (HPR) Solenoid Closed / ON

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Closed / ON

Liquid Line Solenoid Energized

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

TERMINATES AT

PIN CONNECTION

*OVERLOAD

BIN SWITCH

ICE THICKNESS PROBE

(F1)

TB33 (52)

(51)

(48)

B35 L1

(42)

CONTACTOR

CONTACTS

(66)

(64)

WATER LEVEL PROBE

NOT USED

TB32

B35

(55)

HIGH PRES

CUTOUT

(73) (74)

REMOTE

FAN MOTOR

RUN CAPACITOR

PTCR

TB34

(53)

REMOTE CONDENSER

(F2)

(45)

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

RUN CAPACITOR

TOGGLE SWITCH

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL

(68) ICE

R(46)

(49)

(47)

COMPRESSOR

(62)

(66) (69)

(67)

OFF

CLEAN

LOW D.C.

VOLTAGE

PLUG

(63)

(65)

(62)

RR(50) TB3

(56) COIL

VIEW FOR WIRING

TB3

CONTACTOR

TB3

(57)

(58)

FUSE (7A)

TRANS.

(61)

(60)

HARVEST (80)

TB31

TB37

(76)

(98)

(59)

(99)

SOLENOID

DUMP

SOLENOID

WATER

PUMP

SOLENOID

TB3

(82)

(83)

(81)

(75)

LIQUID LINE

HPR

SOLENOID

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(22)(21)

WATER

VALVE

(77)

(79)

(78)

(20)

SV1648-6

Electrical System Section 6

6-16 Part No. 80-1100-3

Automatic Shut-Off

7. AUTOMATIC SHUT-OFF

If the storage bin is full at the end of a

harvest cycle, the sheet of cubes fails

to clear the water curtain and holds it

open. After the water curtain is held

open for 7 seconds, the ice machine

shuts off.

The ice machine remains off until

enough ice is removed from the

storage bin to allow the sheet of

cubes to drop clear of the water

curtain. As the water curtain swings

back to the operating position, the bin

switch closes and the ice machine

restarts.

NOTE: The ice machine must remain

off for 3 minutes before it can

automatically restart.

Figure 6-14. Remote — Automatic Shut-Off

Table 6-14. Remote Models

7. Automatic Shut-Off (Until Bin Switch Closes)

Toggle Switch ICE

Bin Switch Open

Control Board Relays

#1 Water Pump Open / OFF

#2 Water Fill Valve Open / OFF

#3 Harvest Solenoid Open / OFF

Harvest Pressure Regulating (HPR) Solenoid Open / OFF

#4 Water Dump Valve Open / OFF

#5 Contactor Coil Open / OFF

Liquid Line Solenoid De-energized

Compressor ON

Condenser Fan Motor ON

Safety Controls (Which could stop ice machine operation)

High Pressure Cut-Out Closed

Main Fuse (On Control Board) Closed

TERMINATES AT

PIN CONNECTION

*OVERLOAD

BIN SWITCH

ICE THICKNESS PROBE

(F1)

TB33 (52)

(51)

(48)

B35 L1

(42)

CONTACTOR

CONTACTS

(66)

(64)

WATER LEVEL PROBE

NOT USED

TB32

B35

(55)

HIGH PRES

CUTOUT

(74)

(73)

REMOTE

FAN MOTOR

RUN CAPACITOR

PTCR

TB34

(53)

REMOTE CONDENSER

(F2)

(45)

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

RUN CAPACITOR

TOGGLE SWITCH

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL

(68) ICE

R(46)

(49)

(47)

COMPRESSOR

(62)

(66) (69)

(67)

OFF

CLEAN

LOW D.C.

VOLTAGE

PLUG

(63)

(65)

(62)

RR(50) TB3

(56) COIL

VIEW FOR WIRING

TB3

CONTACTOR

TB3

(57)

(58)

FUSE (7A)

TRANS.

(61)

(60)

HARVEST (80)

TB31

TB37

(76)

(98)

(59)

(99)

(75)

SOLENOID

DUMP

SOLENOID

(81)

WATER

PUMP

LIQUID LINE

SOLENOID

TB3

(82)

(83)

HPR

SOLENOID

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

(22)(21)

WATER

VALVE

(77)

(79)(78)

(20)

SV1648-7

Section 6 Electrical System

Part No. 80-1100-3 6-17

Wiring Diagrams

The following pages contain electrical wiring diagrams. Be sure you are referring to the correct diagram for the ice

machine which you are servicing.

WIRING DIAGRAM LEGEND

The following symbols are used on all of the wiring diagrams:

* Internal Compressor Overload

(Some models have external compressor overloads)

** Fan Motor Run Capacitor

(Some models do not incorporate fan motor run capacitor)

TB Terminal Board Connection

(Terminal board numbers are printed on the actual terminal board)

( ) Wire Number Designation

(The number is marked at each end of the wire)

—>>— Multi-Pin Connection

(Electrical Box Side) —>>— (Compressor Compartment Side)

Warning

Always disconnect power before working on

electrical circuitry.

Electrical System Section 6

6-18 Part No. 80-1100-3

Q200/Q280/Q320 - SELF CONTAINED - 1 PHASE WITH TERMINAL BOARD

TB31

TB37

TB32

TB35

TB34

(53)

TB33 (52)

(51)

(48)

(50)

(49)

(47)

(55)

(61)

(77)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(73)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

TB3

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

B35

TB3

CONTACTOR

CONTACTS

(42)

COMPRESSOR

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

PTCR

TB3

LOW D.C.

VOLTAGE

PLUG

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

*OVERLOAD

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(21) (22)

WATER

VALVE

NOT USED

(20)

SV1654

Section 6 Electrical System

Part No. 80-1100-3 6-19

Q280/Q370 - SELF CONTAINED - 1 PHASE WITHOUT TERMINAL BOARD

4START

CAPACITOR

POTENTIAL

RELAY

COMPRESSOR

TERMINAL LAYOUT

VIEWED FROM END

OF COMPRESSOR

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

SAFETY LIMIT CODE LIGHT

HARVEST LIGHT/

WATER LEVEL

CLEAN LIGHT

BIN SWITCH LIGHT

CLEAN

OFF

ICE

(68)

(69)

(62)

(49)

(47)

COMPRESSOR

OVERLOAD INTERNAL

{230V 50/60 HZ}

(86)(85)

(51)

(48)

CONTACTOR

CONTACTS

(42)

FAN CYCLE CONTROL

RUN CAPACITOR**

FAN MOTOR

(AIR COOLED ONLY)

(50)

VIEW FOR

WIRING

SEE SERIAL PLATE FOR VOLTAGE

L2 (N)

(74)

TERMINATES AT

PIN CONNECTION

(59)

(58)

(56)

(98)

DUMP

SOLENOID

(57)

(81)

(99)

(75)

(80)

(76)

HARVEST

SOLENOID

(77)

WATER

VALVE

(21) (22)

(60)

(61)

(55)

HIGH PRES

CUTOUT

WATER LEVEL PROBE

NOT USED

ICE THICKNESS PROBE

LOW D.C.

VOLTAGE

PLUG

BIN SWITCH

(64)

(66) (66)

(67)

(63)

(62)

CONTACTOR

COIL

WATER

PUMPFUSE (7A)

TRANS.

(65)

(89)

(88)

(20)

(46) (44)

(45)

SV3018

Electrical System Section 6

6-20 Part No. 80-1100-3

Q320 - SELF CONTAINED - 1 PHASE WITHOUT TERMINAL BOARD

*OVERLOAD

OVERLOAD

(51)

(48)

(45)

(46)

(49)

(47)

(48)

(50)

(49)

(47)

(55)

(61)

(20)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(22)

WATER

PUMP

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

CONTACTS

(42)

COMPRESSOR

RUN CAPACITOR

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

PTCR

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

CLEAN LIGHT

WATER LEVEL

WATER LEVEL PROBE

(77)

(80)

WATER

VALVE

NOT USED

(89)

(88)

(21)

SV2070

Section 6 Electrical System

Part No. 80-1100-3 6-21

Q420/Q450/Q600/Q800/Q1000 - SELF CONTAINED -

1 PHASE WITH TERMINAL BOARD

TB31

TB37

TB32

B35

TB34

*OVERLOAD

(53)

TB33 (52)

(51)

(48) (45)

(46) (50)

(49)

(47)

(55) (61)

(21)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(73)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(22)

WATER

PUMP

TB30

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

TB35

TB3

CONTACTOR

CONTACTS

(42)

COMPRESSOR RUN CAPACITOR

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

PTCR

TB3

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(77)

(80)

WATER

VALVE

NOT USED

(20)

SV1646

Electrical System Section 6

6-22 Part No. 80-1100-3

Q420/Q450/Q600/Q800/Q1000 - SELF CONTAINED -

1 PHASE WITHOUT TERMINAL BOARD

*Overload C

(51)

(48)

(45) (46)

(49)

(50)

(47)

(55) (61)

(20) (21)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

DUMP

SOLENOID (81)

(22)

WATER

PUMP

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

CONTACTS

(42)

COMPRESSOR

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

L2 (N

)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

PTCR

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

CLEAN LIGHT

WATER LEVEL

WATER LEVEL PROBE

(77)

(80)

WATER

VALVE

NOT USED

(89)

(88)

SV2071

Section 6 Electrical System

Part No. 80-1100-3 6-23

Q800/Q1000 - SELF CONTAINED - 3 PHASE WITH TERMINAL BOARD

TB31

TB37

(77)

(76)

(98)

(74)

(59)

(73)

(99)

(85) (86)

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

TB3

CONTACTOR

COIL

TB3

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

(61)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

TB32

TB35

TB34

(53)

TB33 (52)

HIGH PRES

CUTOUT

(96)

(42)

COMPRESSOR

L3 L2 L1

TB35

T3 T1

(55)

TB3

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

(21) (22)

WATER

VALVE

WATER LEVEL PROBE

NOT USED

(20)

SV1647a

Electrical System Section 6

6-24 Part No. 80-1100-3

Q800/Q1000 - SELF CONTAINED - 3 PHASE WITHOUT TERMINAL BOARD

L1L2L3

(51)

(55)

(61)

(20) (21)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

DUMP

SOLENOID (81)

(22)

WATER

PUMP

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

CONTACTS

T1T3

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH 68

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

CLEAN LIGHT

WATER LEVEL

WATER LEVEL PROBE

(77)

(80)

WATER

VALVE

NOT USED

(89)

(88)

(42)

SV2072

Section 6 Electrical System

Part No. 80-1100-3 6-25

Q1300/Q1800 - SELF CONTAINED - 1 PHASE WITH TERMINAL BOARD

TB31

TB37

TB32

TB35

TB34

*OVERLOAD

(53)

TB33 (52)

(51)

(48) (45)

(46) (50)

(49)

(47)

(55)

(61)

(77)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(73)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

LH HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

TB3

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

TB35 TB3

CRANKCASE HEATER (94)

(95)

B35 TB3

CONTACTOR

CONTACTS

CONTACTOR

CONTACTS

(96)

(42)

COMPRESSOR RUN CAPACITOR

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

L2(N)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

PTCR (44)

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

WATER

VALVE

(21)

(22)

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(87)

(88)

RH HARVEST

SOLENOID

AUCS DISPENSE TIME

(20)

SV1652

Electrical System Section 6

6-26 Part No. 80-1100-3

Q1300/Q1600/Q1800 - SELF CONTAINED - 1 PHASE WITHOUT TERMINAL BOARD

*OVERLOAD

(51)

(48)

(95)

(45)

(46)

(49)

(47)

(50)

(94)

(96)

(55)

(61)

(20) (21)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(22)

WATER

PUMP

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

CONTACTS

CONTACTOR

CONTACTS

L1 L2

COMPRESSOR

CRANKCASE HEATER

RUN CAPACITOR

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

L2 (N

)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

PTCR

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

AUCS DISPENSE TIME

(77) (80)

WATER

VALVE

(89)

(88)

(42)

SV2075

Section 6 Electrical System

Part No. 80-1100-3 6-27

Q1300/Q1800 - SELF CONTAINED - 3 PHASE WITH TERMINAL BOARD

TB31

TB37

(77)

(76)

(98)

(74)

(59)

(73)

(99)

(85) (86)

(75)

LH HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

TB30

CONTACTOR

COIL

TB30

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

(61)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

TB30

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

TB32

TB35

TB34

(53)

TB33 (52)

HIGH PRES

CUTOUT

TB35 CRANKCASE HEATER (94)

(95)

(96)

(42)

COMPRESSOR

L3 L2 L1

TB35

T3 T1

(55)

LOW D.C.

VOLTAGE

PLUG

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

N - 50H

ONLY

TB30

NOTE: WIRE (96) IS NOT USED ON 50HZ

TB30

CLEAN LIGHT

WATER LEVEL LIGHT

WATER

VALVE

(21)

(22)

(87)

(88)

RH HARVEST

SOLENOID

AUCS DISPENSE TIME

WATER LEVEL PROBE

(20)

SV1653

Electrical System Section 6

6-28 Part No. 80-1100-3

Q1300/Q1600/Q1800 - SELF CONTAINED - 3 PHASE WITHOUT TERMINAL BOARD

(77)

(76)

(98) (99)

(85) (86)

(75)

LH HARVEST

SOLENOID

DUMP

SOLENOID (81)

(80)

WATER

PUMP

CONTACTOR

COIL

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

(61)

(60)

(57)

(59)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

(51)

HIGH PRES

CUTOUT

CRANKCASE HEATER

(94)

(95)

CONTACTOR

CONTACTS

(96)

COMPRESSOR

L3 L2 L1

L2L3

T3 T1

LOW D.C.

VOLTAGE

PLUG

(64)

(88)

(89) (55)

(42)

(63)

BIN SWITCH

(62)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

N - 50H

ONLY

NOTE: WIRE (96) IS NOT USED ON 50HZ

CLEAN LIGHT

WATER LEVEL LIGHT

WATER

VALVE

(21)(20) (22)

(87)

RH HARVEST

SOLENOID

AUCS DISPENSE TIME

WATER LEVEL PROBE

(88)

SV3008

Section 6 Electrical System

Part No. 80-1100-3 6-29

Q450/Q600/Q800/Q1000 - REMOTE - 1 PHASE WITH TERMINAL BOARD

TB31

TB37

TB32

TB35

(55)

(77)

(76)

(98)

(59)

(99)

(75)

HPR

SOLENOID

(79)(78)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

LIQUID LINE

SOLENOID

TB3

(82)

(83)

HIGH PRES

CUTOUT

REMOTE

FAN MOTOR

RUN CAPACITOR

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

REMOTE CONDENSER

TERMINATES AT

PIN CONNECTION

(F1) (F2)

(61)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

(74)

(73) TB3

CONTACTOR

COIL

TB34

*OVERLOAD

(53)

TB33 (52)

(51)

(48) (45)

(46) (50)

(49)

(47)

B35

CONTACTOR

CONTACTS

(42)

COMPRESSOR RUN CAPACITOR

PTCR

TB3

LOW D.C.

VOLTAGE

PLUG

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(22)(21)

WATER

VALVE

NOT USED

(20)

SV1648

Electrical System Section 6

6-30 Part No. 80-1100-3

Q450/Q600/Q800/Q1000 - REMOTE - 1 PHASE WITHOUT TERMINAL BOARD

*OVERLOAD

(51)

(48)

(42)

(45)

(46)

(49)

(47)

RR (50)

(94)

(55) (61)

(20) (21)

(77)

(60)

(98)

(57)

(74)

(58)

(59) (83) (82)

(99)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

HPR

SOLENOID

DUMP

SOLENOID

(81)

(22)

WATER

PUMP

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

CONTACTS

COMPRESSOR

RUN CAPACITOR

LIQUID LINE

SOLENOID

REMOTE

FAN MOTOR

REMOTE CONDENSER

RUN CAPACITOR**

L2 (

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

PTCR

F1 F2

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

AUCS DISPENSE TIME

(88) (80)

(78) (79)

WATER

VALVE

(89)

(88)

SV2073

Section 6 Electrical System

Part No. 80-1100-3 6-31

Q800/Q1000 -REMOTE - 3 PHASE WITH TERMINAL BOARD

TB31

TB37

TB32

TB35

TB34

(53)

TB33 (52)

(55)

(77)

(76)

(98)

(59)

(99)

(75)

HPR

SOLENOID

(79)

(78)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

LIQUID LINE

SOLENOID

TB3

(82)

(83)

HIGH PRES

CUTOUT

TB3

CONTACTOR

CONTACTS

(96)

(42)

COMPRESSOR

REMOTE

FAN MOTOR

RUN CAPACITOR

EE SERIAL PLATE FOR VOLTAGE CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

REMOTE CONDENSER

L3 L2 L1

TB35

T3 T1

TERMINATES AT

PIN CONNECTION

(F1) (F2)

(61)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

(74)

(73) TB3

CONTACTOR

COIL

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(22)

(21)

WATER

VALVE

AUCS DISPENSE TIME

(20)

SV1649

Electrical System Section 6

6-32 Part No. 80-1100-3

Q800/Q1000 -REMOTE - 3 PHASE WITHOUT TERMINAL BOARD

(55)

(89)

(88)

(42)

(51)

(85)

(77)

(76)

(98)

(59)

(99)

(75)

HPR

SOLENOID (79)

(78)

HARVEST

SOLENOID

DUMP

SOLENOID (81)

(80)

WATER

PUMP

LIQUID LINE

SOLENOID

(82)

(74)

(83)

HIGH PRES

CUTOUT

CONTACTOR

CONTACTS

COMPRESSOR

REMOTE

FAN MOTOR

RUN CAPACITOR

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

REMOTE CONDENSER

L3 L2 L1

T3 T1

(F1)

(F2)

(61)

(20)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

COIL

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(22)

(21)

WATER

VALVE

NOT USED

SV2074

Section 6 Electrical System

Part No. 80-1100-3 6-33

Q1300/Q1800 - REMOTE - 1 PHASE WITH TERMINAL BOARD

TB31

TB37

TB32

B35

TB34

(53)

TB33 (52)

(51)

(55)

(77)

(76)

(98)

(59)

(99)

(75)

WATER

VALVE (22)

(21)

LH HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

LIQUID LINE

SOLENOID

TB3

(82)

(83)

HIGH PRES

CUTOUT

TB35

CONTACTOR

CONTACTS

(42)

REMOTE

FAN MOTOR

RUN CAPACITOR

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

REMOTE CONDENSER

TERMINATES AT

PIN CONNECTION

(F1)

(F2)

(61)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

TB3

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

*OVERLOAD

(48) (45)

(46) (50)

(49)

(47)

(74)

(73) TB3

CONTACTOR

COIL

TB35 TB3

CRANKCASE HEATER (94)(95)

TB3

CONTACTOR

CONTACTS

(96)

COMPRESSOR RUN CAPACITOR

PTCR (44)

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

HPR

SOLENOID

(87)(88)

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(79)(78)

RH HARVEST

SOLENOID

AUCS DISPENSE TIME

(20)

SV1650

Electrical System Section 6

6-34 Part No. 80-1100-3

Q1300/Q1600/Q1800 - REMOTE - 1 Phase Without Terminal Board

TB37

(48)

(51)

(55)(89)

(88)

(42)

(77)

(76)

(98)

(59)

(99)

(75)

RH HARVEST

SOLENOID

(87)

(88)

HPR

SOLENOID

(79)

(78)

LH HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

LIQUID LINE

SOLENOID

(82)

(83)

HIGH PRES

CUTOUT

CONTACTOR

CONTACTS CONTACTOR

RUN CAPACITOR

CONTACTS

(49)

(96)

(74)

(94)

(47)

(45)

(46) (50)

(44) PTCR

(95)

COMPRESSOR

CRANKCASE HEATER

*OVERLOAD

REMOTE

FAN MOTOR

RUN CAPACITOR

SEE SERIAL PLATE FOR VOLTAGECAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

REMOTE CONDENSER

L2 (N)

(F1) (F2)

(F2)

(61)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

COIL

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67)

(68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(22)

(21)(20)

WATER

VALVE

AUCS DISPENSE TIME

SV2076

Section 6 Electrical System

Part No. 80-1100-3 6-35

Q1300/Q1800 - REMOTE - 3 PHASE WITH TERMINAL BOARD

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

TB31

TB37

TB32

TB35

TB34

(53)

TB33 (52)(51)

(55)

(77)

(76)

(98)

(59)

(99)

(75)

WATER

VALVE (22)

(21)

LH HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

LIQUID LINE

SOLENOID

TB30

(82)

(83)

HIGH PRES

CUTOUT

TB35 TB30

CRANKCASE HEATER (94)

TB30

CONTACTOR

CONTACTS

(96)

(42)

COMPRESSOR

REMOTE

FAN MOTOR

RUN CAPACITOR

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

REMOTE CONDENSER

L3 L2 L1

L2L3 TB35

T3 T1

TERMINATES AT

PIN CONNECTION

(F1)

(F2)

(61)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

TB30

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

(74)

(73) TB30

CONTACTOR

COIL

(95)

N - 50H

ONLY

NOTE: WIRE (96) IS NOT USED ON 50HZ

TB30

HPR

SOLENOID

(87)

(88)

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(79)

(78)

RH HARVEST

SOLENOID

AUCS DISPENSE TIME

(20)

SV1651

Electrical System Section 6

6-36 Part No. 80-1100-3

Q1300/Q1600/Q1800 - REMOTE - 3 PHASE WITHOUT TERMINAL BOARD

(55)(89)

(88)

(42)

(51)

(95) (94)

(96) (96)

NOTE: WIRE (96) IS NOT USED ON 50HZ

(77)

(76)

(98)

(59)

(99)

(75)

HPR

SOLENOID

(87)

(88)

(79)

(78)

RH HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(80)

WATER

PUMP

LIQUID LINE

SOLENOID

(82)(83)

HIGH PRES

CUTOUT

CONTACTOR

CONTACTS

COMPRESSOR

REMOTE

FAN MOTOR

RUN CAPACITOR

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

REMOTE CONDENSER

L3 L2 L1

T3 T1

(F1)

(F2)

(61)

(20)

(60)

(57)

(58)

FUSE (7A)

TRANS.

(56)

(74)

ICE THICKNESS PROBE

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

CONTACTOR

COIL

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(22)

(21)

WATER

N - 50 H

ONL

VALVE

NOT USED

LH HARVEST

SOLENOID

SV2077

Section 6 Electrical System

Part No. 80-1100-3 6-37

THIS PAGE INTENTIONALLY LEFT BLANK

Electrical System Section 6

6-38 Part No. 80-1100-3

Component Specifications and Diagnostics

MAIN FUSE

Function

The control board fuse stops ice machine operation if

electrical components fail causing high amp draw.

Specifications

The main fuse is 250 Volt, 7 amp.

Check Procedure

1. If the bin switch light is on with the water curtain

closed, the fuse is good.

2. Remove the fuse. Check the resistance across the

fuse with an ohm meter.

BIN SWITCH

Function

Movement of the water curtain controls bin switch

operation. The bin switch has two main functions:

1. Terminating the harvest cycle and returning the ice

machine to the freeze cycle.

This occurs when the bin switch is opened and

closed again within 7 seconds during the harvest

cycle.

2. Automatic ice machine shut-off.

If the storage bin is full at the end of a harvest cycle,

the sheet of cubes fails to clear the water curtain and

holds it open. After the water curtain is held open for

7 seconds, the ice machine shuts off. The ice

machine remains off until enough ice is removed

from the storage bin to allow the sheet of cubes to

drop clear of the water curtain. As the water curtain

swings back to the operating position, the bin switch

closes and the ice machine restarts, provide the

three-minute delay has expired.

Specifications

The bin switch is a magnetically operated reed switch.

The magnet is attached to the lower right corner of the

water curtain. The switch is attached to the evaporator-

mounting bracket.

The bin switch is connected to a varying D.C. voltage

circuit. (Voltage does not remain constant.)

NOTE: Because of a wide variation in D.C. voltage, it is

not recommended that a voltmeter be used to check bin

switch operation.

Warning

High (line) voltage is applied to the control board

(terminals #55 and #56) at all times. Removing the

control board fuse or moving the toggle switch to

OFF will not remove the power supplied to the

control board.

Warning

Disconnect electrical power to the entire ice

machine before proceeding.

Reading Result

Open (OL) Replace fuse

Closed (O) Fuse is good

Important

The water curtain must be ON (bin switch(s) closed)

to start ice making.

Section 6 Electrical System

Part No. 80-1100-3 6-39

Check Procedure

1. Set the toggle switch to OFF.

2. Watch the bin switch light on the control board.

3. Move the water curtain toward the evaporator. The

bin switch must close. The bin switch light “on”

indicates the bin switch has closed properly.

Move the water curtain away from the evaporator. The

bin switch must open. The bin switch light “off” indicates

the bin switch has opened properly.

OHM Test

1. Disconnect the bin switch wires to isolate the bin

switch from the control board.

2. Connect an ohmmeter to the disconnected bin

switch wires.

3. Cycle the bin switch open and closed numerous

times by opening and closing the water curtain.

NOTE: To prevent misdiagnosis:

• Always use the water curtain magnet to cycle the

switch (a larger or smaller magnet will affect switch

operation).

• Watch for consistent readings when the bin switch is

cycled open and closed (bin switch failure could be

erratic).

Water Curtain Removal Notes

The water curtain must be on (bin switch closed) to start

ice making. While a freeze cycle is in progress, the water

curtain can be removed and installed at any time without

interfering with the electrical control sequence.

If the ice machine goes into harvest sequence while the

water curtain is removed, one of the following will

happen:

• Water curtain remains off:

When the harvest cycle time reaches 3.5 minutes

and the bin switch is not closed, the ice machine

stops as though the bin were full.

• Water curtain is put back on:

If the bin switch closes prior to reaching the 3.5-

minute point, the ice machine immediately returns to

another freeze sequence prechill.

Electrical System Section 6

6-40 Part No. 80-1100-3

COMPRESSOR ELECTRICAL DIAGNOSTICS

The compressor will not start or will trip repeatedly on

overload.

Check Resistance (Ohm) Values

NOTE: Compressor windings can have very low ohm

values. Use a properly calibrated meter.

Perform the resistance test after the compressor cools.

The compressor dome should be cool enough to touch

(below 120°F/49°C) to assure that the overload is closed

and the resistance readings will be accurate.

SINGLE PHASE COMPRESSORS

1. Disconnect power from the cuber and remove the

wires from the compressor terminals.

2. The resistance values must be within published

guidelines for the compressor. The resistance

values between C and S and between C and R,

when added together, should equal the resistance

value between S and R.

3. If the overload is open, there will be a resistance

reading between S and R, and open readings

between C and S and between C and R. Allow the

compressor to cool, then check the readings again.

THREE PHASE COMPRESSORS

1. Disconnect power from the cuber and remove the

wires from the compressor terminals.

2. The resistance values must be within published

guidelines for the compressor. The resistance

values between L1 and L2, between L2 and L3, and

between L3 and L1 should all be equal.

3. If the overload is open, there will be open readings

between L1 and L2, between L2 and L3, and

between L3 and L1. Allow the compressor to cool,

then check the readings again.

Check Motor Windings to Ground

Check continuity between all three terminals and the

compressor shell or copper refrigeration line. Scrape

metal surface to get good contact. If continuity is

present, the compressor windings are grounded and the

compressor should be replaced.

Determine if the Compressor is Seized

Check the amp draw while the compressor is trying to

start.

COMPRESSOR DRAWING LOCKED ROTOR

The two likely causes of this are:

• Defective starting component

• Mechanically seized compressor

To determine which you have:

1. Install high and low side gauges.

2. Try to start the compressor.

3. Watch the pressures closely.

A. If the pressures do not move, the compressor is

seized. Replace the compressor.

B. If the pressures move, the compressor is turning

slowly and is not seized. Check the capacitors

and start relay.

COMPRESSOR DRAWING HIGH AMPS

The continuous amperage draw on start-up should not

be near the maximum fuse size indicated on the serial

tag.

The voltage when the compressor is trying to start must

be within ±10% of the nameplate voltage.

Diagnosing Capacitors

• If the compressor attempts to start, or hums and trips

the overload protector, check the starting

components before replacing the compressor.

• Visual evidence of capacitor failure can include a

bulged terminal end or a ruptured membrane. Do not

assume a capacitor is good if no visual evidence is

present.

• A good test is to install a known good substitute

capacitor.

• Use a capacitor tester when checking a suspect

capacitor. Clip the bleed resistor off the capacitor

terminals before testing.

Section 6 Electrical System

Part No. 80-1100-3 6-41

PTCR DIAGNOSTICS

What is a PTCR?

A PTCR (or Positive Temperature Coefficient Resistor) is

made from high-purity, semi-conducting ceramics.

A PTCR is useful because of its resistance versus

temperature characteristic. The PTCR has a low

resistance over a wide (low) temperature range, but

upon reaching a certain higher temperature, its

resistance greatly increases, virtually stopping current

flow. When the source of heat is removed, the PTCR

returns to its initial base resistance.

In severe duty cycles, it can be used to repeatedly

switch (virtually stop) large currents at line voltages.

PTCR’s have been used for many years in millions of

HVAC applications. In place of using the conventional

start relay/start capacitor, a simple PTCR provides the

starting torque assistance to PSC (Permanent Split

Capacitor) single-phase compressors, which can

equalize pressures before starting.

Compressor Start Sequence

PTCR’s provide additional starting torque by increasing

the current in the auxiliary (start) winding during starting.

The PTCR is wired across the run capacitor (in series

with the start winding).

1. It is important for the refrigerant discharge and

suction pressures to be somewhat equalized prior to

the compressor starting. To assure equalization of

pressures the harvest valve (and HPR valve on

remotes) will energize for 45 seconds prior to

compressor starting. The harvest valve (and HPR

valve on remotes) remains on for an additional 5

seconds while the compressor is starting.

2. When starting the compressor, the contactor closes

and the PTCR, which is at a low resistance value,

allows high starting current to flow in the start

winding.

3. The current passing through the PTCR causes it to

rapidly heat up, and after approximately .25-1

second it abruptly “switches” to a very high

resistance, virtually stopping current flow through it.

4. At this point the motor is up to speed and all current

going through the start winding will now pass

through the run capacitor.

5. The PTCR remains hot and at a high resistance as

long as voltage remains on the circuit.

6. It is important to provide time between compressor

restarts to allow the PTCR to cool down to near its

initial temperature (low resistance). When the

contactor opens to stop the compressor, the PTCR

cools down to its initial low resistance and is again

ready to provide starting torque assistance. To

assure the PTCR has cooled down, during an

automatic shut-off, the Q model ice machines have a

built-in 3-minute off time before it can restart.

Electrical System Section 6

6-42 Part No. 80-1100-3

Q-Model Automatic Shut-Off and Restart

When the storage bin is full at the end of a harvest cycle,

the sheet of cubes fails to clear the water curtain and will

hold it open. After the water curtain is held open for 7

seconds, the ice machine shuts off. To assure the PTCR

has cooled, the ice machine remains off for 3 minutes

before it can automatically restart.

The ice machine remains off until enough ice has been

removed from the storage bin to allow the ice to fall clear

of the water curtain. As the water curtain swings back to

operating position, the bin switch closes and the ice

machine restarts, provided the three-minute delay period

is complete.

Figure 6-15. During Start-Up (First .25 - 1.0 Seconds)

Figure 6-16. After Start-Up

(Current Flows Through Run Capacitor)

Troubleshooting PTCR’s

WHY A GOOD PTCR MAY FAIL

TO START THE COMPRESSOR

The PTCR must be cooled before attempting to start the

compressor, otherwise the high starting torque may not

last long enough.

For example, if the PTCR is properly cooled, say 60°F

(15.6°C) when the compressor starts, it will take .25 to

1.0 seconds before its temperature reaches 260°F

(126.6°C), and current flow is stopped.

If the PTCR is still warm, say 160°F (71.1°C) when the

compressor starts, it will take only .125 to .50 seconds

before its temperature reaches 260°F (126.6°C), and

current flow is stopped. This decreased time may be

insufficient to start the compressor.

A good PTCR may be too hot to operate properly at

start-up because:

• The ice machine’s 3-minute delay has been

overridden. Opening and closing the service

disconnect or cycling the toggle switch from OFF to

ICE will override the delay period.

• The control box temperature is too high. Though

rare, very high air temperatures (intense sunlight,

etc.) can greatly increase the temperature of the

control box and its contents. This may require a

longer off time to allow the PTCR to cool.

• The compressor has short-cycled, or the compressor

overload has opened. Move the toggle switch to OFF

and allow the compressor and PTCR to cool.

Continued on next page …

SV1506

L1 L2

CONTACTOR

CONTACTS RUN CAPACITOR

PTCR

COMPRESSOR

SV1507

L1 L2

CONTACTOR

CONTACTS RUN CAPACITOR

PTCR

COMPRESSOR

Section 6 Electrical System

Part No. 80-1100-3 6-43

There are other problems that may cause compressor

start-up failure with a good PTCR in a new, properly

wired ice machine.

• The voltage at the compressor during start-up is too

low.

Manitowoc ice machines are rated at ±10% of

nameplate voltage at compressor start-up. (Ex: An

ice machine rated at 208-230 should have a

compressor start-up voltage between 187 and 253

volts.)

• The compressor discharge and suction pressures

are not matched closely enough or equalized.

These two pressures must be somewhat equalized

before attempting to start the compressor. The

harvest valve (and HPR valve on remotes) energizes

for 45 seconds before the compressor starts, and

remains on 5 seconds after the compressor starts.

Make sure this is occurring and the harvest valve

(and HPR solenoid) coil is functional before

assuming that the PTCR is bad.

CHECKING THE PTCR

1. Visually inspect the PTCR. Check for signs of

physical damage.

NOTE: The PTCR case temperature may reach 210°F

(100°C) while the compressor is running. This is normal.

Do not change a PTCR just because it is hot.

2. Wait at least 10 minutes for the PTCR to cool to

room temperature.

3. Remove the PTCR from the ice machine.

4. Measure the resistance of the PTCR as shown

below. If the resistance falls outside of the

acceptable range, replace it.

Figure 6-17. Manitowoc PTCR’s 8505003 & 8504993

Figure 6-18. Manitowoc PTCR 8504913

Warning

Disconnect electrical power to the entire ice

machine at the building electrical disconnect box

before proceeding.

Model Manitowoc

Part Number Cera-Mite

Part Number

Room

Temperature

Resistance

Q200

Q280

Q320

Q420

Q450

8505003 305C20 22-50 Ohms

Q600

Q800

Q1000

8504993 305C19 18-40 Ohms

Q1300

Q1600

Q1800

8504913 305C9 8-22 Ohms

SV1540

SV1541

Electrical System Section 6

6-44 Part No. 80-1100-3

ICE/OFF/CLEAN TOGGLE SWITCH

Function

The switch is used to place the ice machine in ICE, OFF

or CLEAN mode of operation.

Specifications

Double-pole, double-throw switch. The switch is

connected into a varying low D.C. voltage circuit.

Check Procedure

NOTE: Because of a wide variation in D.C. voltage, it is

not recommended that a volt meter be used to check

toggle switch operation.

1. Inspect the toggle switch for correct wiring.

2. Isolate the toggle switch by disconnecting all wires

from the switch, or by disconnecting the Molex

connector and removing wire #69 from the toggle

switch.

3. Check across the toggle switch terminals using a

calibrated ohm meter. Note where the wire numbers

are connected to the switch terminals, or refer to the

wiring diagram to take proper readings.

4. Replace the toggle switch if ohm readings do not

match all three switch settings.

CONTROL BOARD RELAYS

Function

The control board relays energize and de-energize

system components.

Specifications

Relays are not field replaceable. There are five relays on

the control board:

Switch Setting Terminals Ohm Reading

ICE

66-62 Open

67-68 Closed

67-69 Open

CLEAN

66-62 Closed

67-68 Open

67-69 Closed

OFF

66-62 Open

67-68 Open

67-69 Open

Relay Controls

#1 Water Pump

#2 Water Inlet Valve

#3 Harvest Valve / HPR Valve (Remotes)

#4 Water Dump Valve

#5 Contactor (Self-Contained)

Contactor / Liquid Line Solenoid (Remotes)

Section 6 Electrical System

Part No. 80-1100-3 6-45

ELECTRONIC CONTROL BOARD

Figure 6-19. Control Board

SV1588

AC LINE VOLTAGE

ELECTRICAL

PLUG (NUMBERS

MARKED ON

WIRES)

MAIN FUSE (7A)

AUTOMATIC

CLEANING

SYSTEM (AuCS)

ACCESSORY PLUG

ICE THICKNESS

PROBE (3/16''

CONNECTION)

WATER LEVEL

PROBE

JUMPER USED

ON Q1300/Q1600/

Q1800 ONLY

DC LOW VOLTAGE

ELECTRICAL PLUG

(NUMBERS

MARKED ON

WIRES)

CLEAN LIGHT

YELLOW

WATER LEVEL

PROBE LIGHT

GREEN

BIN SWITCH

LIGHT GREEN

HARVEST LIGHT/

SAFETY LIMIT

CODE LIGHT

RED

Electrical System Section 6

6-46 Part No. 80-1100-3

General

Q-Model control boards use a dual voltage transformer.

This means only one control board is needed for both

115V and 208-230V use.

Safety Limits

In addition to standard safety controls, such as the high

pressure cut-out, the control board has built-in safety

limits.

These safety limits protect the ice machine from major

component failures. For more information, see “Safety

Limits” on Page 7-13.

Inputs

The control board, along with inputs, controls all

electrical components, including the ice machine

sequence of operation. Prior to diagnosing, you must

understand how the inputs affect the control board

operation.

Refer to specific component specifications (inputs),

wiring diagrams and ice machine sequence of operation

sections for details.

As an example, refer to “Ice Thickness Probe” on the

next page for information relating to how the probe and

control board function together.

This section will include items such as:

• How a harvest cycle is initiated

• How the harvest light functions with the probe

• Freeze time lock-in feature

• Maximum freeze time

• Diagnosing ice thickness control circuitry

Section 6 Electrical System

Part No. 80-1100-3 6-47

Ice Thickness Probe (Harvest Initiation)

HOW THE PROBE WORKS

Manitowoc’s electronic sensing circuit does not rely on

refrigerant pressure, evaporator temperature, water

levels or timers to produce consistent ice formation.

As ice forms on the evaporator, water (not ice) contacts

the ice thickness probe. After the water completes this

circuit across the probe continuously for 6-10 seconds, a

harvest cycle is initiated.

Figure 6-20. Ice Thickness Probe

HARVEST/SAFETY LIMIT LIGHT

This light’s primary function is to be on as water contacts

the ice thickness probe during the freeze cycle, and

remain on throughout the entire harvest cycle. The light

will flicker as water splashes on the probes.

The light’s secondary function is to continuously flash

when the ice machine is shut off on a safety limit, and to

indicate which safety limit shut off the ice machine.

FREEZE TIME LOCK-IN FEATURE

The ice machine control system incorporates a freeze

time lock-in feature. This prevents the ice machine from

short cycling in and out of harvest.

The control board locks the ice machine in the freeze

cycle for six minutes. If water contacts the ice thickness

probe during these six minutes, the harvest light will

come on (to indicate that water is in contact with the

probe), but the ice machine will stay in the freeze cycle.

After the six minutes are up, a harvest cycle is initiated.

This is important to remember when performing

diagnostic procedures on the ice thickness control

circuitry.

To allow the service technician to initiate a harvest cycle

without delay, this feature is not used on the first cycle

after moving the toggle switch OFF and back to ICE.

MAXIMUM FREEZE TIME

The control system includes a built-in safety which will

automatically cycle the ice machine into harvest after 60

minutes in the freeze cycle.

ICE THICKNESS CHECK

The ice thickness probe is factory-set to maintain the ice

bridge thickness at 1/8" (3.2 mm).

NOTE: Make sure the water curtain is in place when

performing this check. It prevents water from splashing

out of the water trough.

1. Inspect the bridge connecting the cubes. It should

be about 1/8" (3.2 mm) thick.

2. If adjustment is necessary, turn the ice thickness

probe adjustment screw clockwise to increase

bridge thickness, or counterclockwise to decrease

bridge thickness.

NOTE: Turning the adjustment 1/3 of a turn will change

the ice thickness about 1/16" (1.5 mm).

Figure 6-21. Ice Thickness Check

Make sure the ice thickness probe wire and the bracket

do not restrict movement of the probe.

Ice Thickness Probe Cleaning

1. Mix a solution of Manitowoc ice machine cleaner

and water (2 ounces of cleaner to 16 ounces of

water) in a container.

2. Soak ice thickness probe in container of cleaner/

water solution while disassembling and cleaning

water circuit components (soak ice thickness probe

for 10 minutes or longer).

3. Clean all ice thickness probe surfaces including all

plastic parts (do not use abrasives). Verify the ice

thickness probe cavity is clean. Thoroughly rinse ice

thickness probe (including cavity) with clean water,

then dry completely. Incomplete rinsing and

drying of the ice thickness probe can cause

premature harvest.

4. Reinstall ice thickness probe, then sanitize all ice

machine and bin/dispenser interior surfaces.

SV1730A

SV1208

ADJUSTING SCREW

1/8” ICE BRIDGE THICKNESS

Electrical System Section 6

6-48 Part No. 80-1100-3

DIAGNOSING ICE THICKNESS CONTROL CIRCUITRY

Ice Machine Does Not Cycle Into Harvest When Water Contacts The Ice Thickness Control Probe

Step 1 Bypass the freeze time lock-in feature by moving the ICE/OFF/CLEAN switch to OFF and back to ICE. Wait

until the water starts to flow over the evaporator.

Step 2 Clip the jumper wire leads to the ice thickness probe and any cabinet ground.

Figure 6-22. Step 2

Step 3 Disconnect the ice thickness probe from the control board at terminal 1C. Clip the jumper wire leads to

terminal 1C on the control board and any cabinet ground. Monitor the harvest light.

Figure 6-23. Step 3

Step 2 Jumper wire connected from probe to ground

Monitoring of Harvest Light Correction

The harvest light comes on, and 6-10 seconds later, ice

machine cycles from freeze to harvest. The ice thickness control circuitry is functioning properly. Do

not change any parts.

The harvest light comes on but the ice machine stays in the

freeze sequence. The ice thickness control circuitry is functioning properly. The

ice machine is in a six-minute freeze time lock-in. Verify step 1

of this procedure was followed correctly.

The harvest light does not come on. Proceed to Step 3, below.

Step 3 Jumper wire connected from control board terminal 1C to ground

Monitoring of Harvest Light Correction

The harvest light comes on, and 6-10 seconds later, ice

machine cycles from freeze to harvest. The ice thickness probe is causing the malfunction.

The harvest light comes on but the ice machine stays in the

freeze sequence. The control circuitry is functioning properly. The ice machine is

in a six-minute freeze time lock-in (verify step 1 of this

procedure was followed correctly).

The harvest light does not come on. The control board is causing the malfunction.

SV1588ASV3010

EVAPORATOR

ICE THICKNESS PROBE

GROUND

JUMPER WIRE

CLEAN LIGHT

WATER LEVEL LIGHT

BIN SWITCH LIGHT

HARVEST/SAFETY LIMIT LIGHT

SV3011 SV1588G

GROUND

JUMPER WIRE

EVAPORATOR

ICE THICKNESS PROBE CLEAN LIGHT

WATER LEVEL LIGHT

BIN SWITCH LIGHT

HARVEST/SAFETY LIMIT LIGHT

Section 6 Electrical System

Part No. 80-1100-3 6-49

Ice Machine Cycles Into Harvest Before Water Contact With The Ice Thickness Probe

Step 1 Bypass the freeze time lock-in feature by moving the ICE/OFF/CLEAN switch to OFF and back to ICE. Wait

until the water starts to flow over the evaporator, then monitor the harvest light.

Step 2 Disconnect the ice thickness probe from the control board at terminal 1C.

Figure 6-24. Step 2

Step 2 Disconnect probe from control board terminal 1C.

Monitoring of Harvest Light Correction

The harvest light stays off and the ice machine remains in the

freeze sequence. The ice thickness probe is causing the malfunction.

Verify that the Ice Thickness probe is adjusted correctly.

The harvest light comes on, and 6-10 seconds later, the ice

machine cycles from freeze to harvest. The control board is causing the malfunction.

SV1588SV3011

ICE THICKNESS PROBE CLEAN LIGHT

WATER LEVEL LIGHT

BIN SWITCH LIGHT

HARVEST/SAFETY LIMIT LIGHT

Electrical System Section 6

6-50 Part No. 80-1100-3

Water Level Control Circuitry

WATER LEVEL PROBE LIGHT

The water level probe circuit can be monitored by

watching the water level light. The water level light is on

when water contacts the probe, and off when no water is

in contact with the probe. The water level light functions

any time power is applied to the ice machine, regardless

of toggle switch position.

Figure 6-25. Freeze Cycle Water Level Setting

During the freeze cycle, the water level probe is set to

maintain the proper water level above the water pump

housing. The water level is not adjustable. If the water

level is incorrect, check the water level probe for

damage (probe bent, etc.). Repair or replace the probe

as necessary.

WATER INLET VALVE SAFETY SHUT-OFF

In the event of a water level probe failure, this feature

limits the water inlet valve to a six-minute on time.

Regardless of the water level probe input, the control

board automatically shuts off the water inlet valve if it

remains on for 6 continuous minutes. This is important to

remember when performing diagnostic procedures on

the water level control circuitry.

FREEZE CYCLE CIRCUITRY

Manitowoc’s electronic sensing circuit does not rely on

float switches or timers to maintain consistent water

level control. During the freeze cycle, the water inlet

valve energizes (turns on) and de-energizes (turns off) in

conjunction with the water level probe located in the

water trough.

During the first 45 seconds of the Freeze Cycle:

• The water inlet valve is on when there is no water in

contact with the water level probe.

• The water inlet valve turns off after water contacts

the water level probe for 3 continuous seconds.

• The water inlet valve will cycle on and off as many

times as needed to fill the water trough.

After 45 seconds into the Freeze Cycle:

The water inlet valve will cycle on, and then off one more

time to refill the water trough. The water inlet valve is

now off for the duration of the freeze sequence.

HARVEST CYCLE CIRCUITRY

The water level probe does not control the water inlet

valve during the harvest cycle. During the harvest cycle

water purge, the water inlet valve energizes (turns on)

and de-energizes (turns off) strictly by time. The harvest

water purge adjustment dial may be set at 15, 30 or 45

seconds.

NOTE: The water purge must be at the factory setting

of 45 seconds for the water inlet valve to energize during

the last 15 seconds of the Water Purge. If set at 15 or 30

seconds the water inlet valve will not energize during the

harvest water purge.

SV1616

30 45

SV1617

CONTROL BOARD

HARVEST

WATER PURGE

ADJUSTMENT

Section 6 Electrical System

Part No. 80-1100-3 6-51

DIAGNOSING FREEZE CYCLE POTABLE WATER

LEVEL CONTROL CIRCUITRY

Problem: Water Trough Overfilling During The

Freeze Cycle

Step 1 Start a new freeze sequence by moving the ICE/

OFF/CLEAN toggle switch to OFF, then back to ICE.

Step 2 Wait until the freeze cycle starts

(approximately 45 seconds, the freeze cycle starts when

the compressor energizes) then connect a jumper from

the water level probe to any cabinet ground.

Figure 6-26. Step 2

Continued on next page …

Important

This restart must be done prior to performing

diagnostic procedures. This assures the ice

machine is not in a freeze cycle water inlet valve

safety shut-off mode. You must complete the entire

diagnostic procedure within 6 minutes of starting.

Important

For the test to work properly you must wait until the

freeze cycle starts, prior to connecting the jumper

wire. If you restart the test you must disconnect the

jumper wire, restart the ice machine, (step 1) and

then reinstall the jumper wire after the compressor

starts.

Step 2 Jumper wire connected from probe to ground

Is water flowing into the

water trough? The Water Level Light is: The Water Inlet Valve

Solenoid Coil is: Cause

no on De-Energized This is normal operation.

Do not change any parts.

yes on De-Energized The water inlet valve is

causing the problem.

yes off Energized Proceed to step 3.

SV1621a

CLEAN LIGHT

WATER LEVEL LIGHT

BIN SWITCH LIGHT

HARVEST/SAFETY LIMIT LIGHT

YELLOW

GR EEN

RED

JUMP ER

GR OUND

Electrical System Section 6

6-52 Part No. 80-1100-3

Problem: Water Trough Overfilling During The

Freeze Cycle (continued)

Step 3 Allow ice machine to run. Disconnect the water

level probe from control board terminal 1F, and connect

a jumper wire from terminal 1F to any cabinet ground.

Remember if you are past 6 minutes from starting, the

ice machine will go into a freeze cycle water inlet valve

safety shut-off mode, and you will be unable to complete

this test. If past 6 minutes you must restart this test by

disconnecting the jumper wire, restarting the ice

machine, (step 1) and then reinstalling the jumper wire to

terminal 1F, after the compressor starts.

Figure 6-27. Step 3

Step 3 Jumper wire connected from control board terminal 1F to ground

Is water flowing into

the water trough? The Water Level

Light is: The Water Inlet Valve

Solenoid Coil is: Cause

no on De-Energized The water level probe is causing the problem.

Clean or replace the water level probe.

yes off Energized The control board is causing the problem.

yes on De-Energized The water fill valve is causing the problem.

SV1588b

CLEAN LIGHT

WATER LEVEL LIGHT

BIN SWITCH LIGHT

HARVEST/SAFETY LIMIT LIGHT

YELLOW

GREEN

RED

JUMPER

GROUND

Section 6 Electrical System

Part No. 80-1100-3 6-53

Problem: Water Will Not Run Into The Sump Trough

During The Freeze Cycle

Step 1 Verify water is supplied to the ice machine, and

then start a new freeze sequence by moving the ICE/

OFF/CLEAN toggle switch to OFF then back to ICE.

Step 2 Wait until the freeze cycle starts (approximately

45 seconds, the freeze cycle starts when the

compressor energizes), and then refer to chart.

Step 3 Leave the ice machine run, then disconnect the

water level probe from control board terminal 1F.

Figure 6-28. Step 3

Important

This restart must be done prior to performing

diagnostic procedures. This assures the ice machine

is not in a freeze cycle water inlet valve safety shut-

off mode. You must complete the entire diagnostic

procedure within 6 minutes of starting.

Step 2 Checking for normal operation

Is water flowing into

the water trough? The Water Level

Light is: The Water Inlet Valve

Solenoid Coil is: Cause

yes off Energized This is Normal Operation don’t change any parts

no on or off Energized Or De-Energized Proceed to step 3

Important

For the test to work properly you must wait until the

freeze cycle starts, prior to disconnecting the water

level probe. If you restart the test you must

reconnect the water level probe, restart the ice

machine, (step 1) and then disconnect the water

level probe after the compressor starts.

Step 3 Disconnect water level probe from control board terminal 1F

Is water flowing into

the water trough? The Water Level

Light is: The Water Inlet Valve

Solenoid Coil is: Cause

yes off Energized The water level probe is causing the problem.

Clean or replace the water level probe.

no off Energized The water inlet valve is causing the problem.

no on or off De-Energized The control board is causing the problem.

YELLOW

GREEN

RED

SV1621G SV1588

CLEAN LIGHT

WATER LEVEL LIGHT

BIN SWITCH LIGHT

HARVEST/SAFETY LIMIT

LIGHT

DISCONNECT

WATER LEVEL

PROBE FROM

TERMINAL 1F

Electrical System Section 6

6-54 Part No. 80-1100-3

Diagnosing An Ice Machine That Will Not Run

NOTE: Refer to wiring diagram on Page 6-55 for component and sequence identification.

Warning

High (line) voltage is applied to the control board

(terminals #55 and #56) at all times. Removing

control board fuse or moving the toggle switch to

OFF will not remove the power supplied to the

control board.

Step Check Notes

1Verify primary voltage supply to ice

machine. Verify that the fuse or circuit breaker is closed.

2Verify the high-pressure cutout is closed. The H.P.C.O. is closed if primary power voltage is present at terminals

#55 and #56 on the control board.

3Verify control board fuse is OK. If the bin switch light functions, the fuse is OK.

4Verify the bin switch functions properly. A defective bin switch can falsely indicate a full bin of ice.

5Verify ICE/OFF/CLEAN toggle switch

functions properly. A defective toggle switch may keep the ice machine in the OFF mode.

6Verify low DC voltage is properly

grounded. Loose DC wire connections may intermittently stop the ice machine.

7Replace the control board. Be sure Steps 1-6 were followed thoroughly. Intermittent problems are

not usually related to the control board.

Section 6 Electrical System

Part No. 80-1100-3 6-55

Q0420/Q0450/Q0600/Q0800/Q1000 - SELF CONTAINED -

1 PHASE WITH TERMINAL BOARD

TB31

TB37

TB32

B35

TB34

*OVERLOAD

(53)

TB33 (52)

(51)

(48) (45)

(46) (50)

(49)

(47)

(55) (61)

(21)

(76)

(60)

(98)

(57)

(74)

(58)

(59)

(73)

(99)

(85) (86)

FUSE (7A)

TRANS.

(56)

ICE THICKNESS PROBE

(75)

HARVEST

SOLENOID

DUMP

SOLENOID

(81)

(22)

WATER

PUMP

TB30

CONTACTOR

COIL

HIGH PRES

CUTOUT

BIN SWITCH LIGHT

HARVEST LIGHT/

SAFETY LIMIT CODE LIGHT

LOW D.C.

VOLTAGE

PLUG

TB35

TB3

CONTACTOR

CONTACTS

(42)

COMPRESSOR RUN CAPACITOR

FAN CYCLE CONTROL

FAN MOTOR

(AIR COOLED ONLY)

RUN CAPACITOR**

L2 (N)

SEE SERIAL PLATE FOR VOLTAGE

CAUTION: DISCONNECT POWER BEFORE WORKING

ON ELECTRICAL CIRCUITRY.

DIAGRAM SHOWN DURING FREEZE CYCLE

TERMINATES AT

PIN CONNECTION

PTCR

TB3

(64)

(63)

BIN SWITCH

(62)

(66)

(65)

(69)

(67) (68)

TOGGLE SWITCH

ICE

OFF

CLEAN

(66)

(62)

VIEW FOR WIRING

INTERNAL WORKING

VIEW

CLEAN LIGHT

WATER LEVEL LIGHT

WATER LEVEL PROBE

(77)

(80)

WATER

VALVE

NOT USED

(20)

SV2071

Electrical System Section 6

6-56 Part No. 80-1100-3

THIS PAGE INTENTIONALLY LEFT BLANK

Part No. 80-1100-3 7-1

Section 7

Refrigeration System

Sequence of Operation

SELF-CONTAINED AIR OR WATER -COOLED MODELS

Figure 7-1. Self-Contained Prechill and Freeze Cycle

(Models Q200/Q280/Q320/Q370/Q420/Q450/Q600/Q800/Q1000)

Prechill Refrigeration Sequence

No water flows over the evaporator during the prechill.

The refrigerant absorbs heat (picked up during the

harvest cycle) from the evaporator. The suction pressure

decreases during the prechill.

Freeze Cycle Refrigeration Sequence

The refrigerant absorbs heat from water running over the

evaporator surface. The suction pressure gradually

drops as ice forms.

HEAT

EXCHANGER

EVAPORATOR

CONDENSER

COMPRESSOR

EXPANSION VALVE

HARVEST SOLENOID VALVE

AIR OR WATER

DRIER

STRAINER

RECEIVER

(WATER COOLED ONLY)

LOW PRESSURE VAPORLOW PRESSURE LIQUIDHIGH PRESSURE LIQUID

IGH PRESSURE VAPOR

SV1569

Refrigeration System Section 7

7-2 Part No. 80-1100-3

Figure 7-2. Self-Contained Harvest Cycle (Models Q200/Q280/Q320/Q370/Q420/Q450/Q600/Q800/Q1000)

Harvest Cycle Refrigeration Sequence

Hot gas flows through the energized harvest valve,

heating the evaporator. The harvest valve is sized to

allow the proper amount of refrigerant into the

evaporator. This specific sizing (along with the proper

system refrigerant charge) assures proper heat transfer,

without the refrigerant condensing and slugging the

compressor.

HEAT

EXCHANGER

EVAPORATOR

CONDENSER

COMPRESSOR

EXPANSION VALVE

HARVEST SOLENOID VALVE

AIR OR WATER

DRIER

STRAINER

RECEIVER

(WATER COOLED ONLY)

LOW PRESSURE VAPORLOW PRESSURE LIQUIDHIGH PRESSURE LIQUIDHIGH PRESSURE VAPOR

SV1570

Section 7 Refrigeration System

Part No. 80-1100-3 7-3

REMOTE MODELS

Figure 7-3. Remote Pre-Chill and Freeze Cycle (Models Q450/Q600/Q800/Q1000)

Prechill Refrigeration Sequence

No water flows over the evaporator during the prechill.

The refrigerant absorbs heat (picked up during the

harvest cycle) from the evaporators. The suction

pressure decreases during the prechill.

Freeze Cycle Refrigeration Sequence

The refrigerant absorbs heat from the water running over

the evaporator surface. The suction pressure gradually

drops as ice forms.

The headmaster control valve maintains discharge

pressure in ambient temperatures below 70°F (21.1°C).

(See “Headmaster Control Valve” on Page 7-30.)

HEAT

EXCHANGER

EVAPORATOR

SOLENOID

LINE

LIQUID

CHECK VALVE

SERVICE

RECEIVER

CONDENSER

REMOTE

COMPRESSOR

RECEIVER

EXPANSION VALVE

HARVEST SOLENOID VALVE

VALVE

HARVEST PRESSURE

REGULATING VALVE

H.P.R. SOLENOID

VALVE

CHECK VALVE

DRIER

STRAINER

HEAD

PRESSURE

CONTROL

VALVE

HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR

SV1566

Refrigeration System Section 7

7-4 Part No. 80-1100-3

Figure 7-4. Remote Harvest Cycle (Models Q450/Q600/Q800/Q1000)

Harvest Cycle Refrigeration Sequence

Hot gas flows through the energized harvest valve,

heating the evaporator. The harvest valve is sized to

allow the proper amount of hot gas into the evaporator.

This specific harvest valve sizing, along with the harvest

pressure regulating (H.P.R.) system, assures proper

heat transfer, without the hot gas condensing to liquid

and slugging the compressor.

The harvest pressure regulating (H.P.R.) valve helps

maintain the suction pressure during the harvest cycle.

(See “H.P.R. System” on Page 7-27.)

HEAT

EXCHANGER

EVAPORATOR

SOLENOID

LINE

LIQUID

CHECK VALVE

SERVICE

RECEIVER

CONDENSER

REMOTE

COMPRESSOR

RECEIVER

EXPANSION VALVE

HARVEST SOLENOID VALVE

VALVE

HARVEST PRESSURE

REGULATING VALVE

H.P.R. SOLENOID

VALVE

CHECK VALVE

DRIER

STRAINER

HEAD

PRESSURE

CONTROL

VALVE

HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR

SV1567

Section 7 Refrigeration System

Part No. 80-1100-3 7-5

Figure 7-5. Remote Automatic Shut-Off (Models Q450/Q600/Q800/Q1000)

Automatic Shut-Off

The compressor and liquid line solenoid valve are de-

energized simultaneously when the contactor contacts

open.

During the off cycle, the check valve prevents refrigerant

from migrating back into the high side, and the liquid line

solenoid prevents refrigerant from migrating back into

the low side. This protects the compressor from

refrigerant migration during the off cycle, preventing

refrigerant slugging upon start-up.

HEAT

EXCHANGER

EVAPORATOR

SOLENOID

LINE

LIQUID

CHECK VALVE

SERVICE

RECEIVER

CONDENSER

REMOTE

COMPRESSOR

RECEIVER

EXPANSION VALVE

HARVEST SOLENOID VALVE

VALVE

HARVEST PRESSURE

REGULATING VALVE

H.P.R. SOLENOID

VALVE

CHECK VALVE

DRIER

STRAINER

HEAD

PRESSURE

CONTROL

VALVE

LIQUID/VAPOR EQUALIZED TO AMBIENT CONDITIONS

SV1568

Refrigeration System Section 7

7-6 Part No. 80-1100-3

Q1300/Q1600/Q1800 REFRIGERATION TUBING SCHEMATICS

Figure 7-6. Q1300/Q1600/Q1800 Self-Contained Air- or Water-Cooled Models

NOTE: The refrigeration sequence for self-contained

dual expansion valve ice machines is identical to self-

contained single expansion valve ice machines. See

Pages 7-1 and 7-2 for sequence of operation.

HARVEST

SOLENOID VALVE

AIR OR WATER COOLED

CONDENSER

COMPRESSOR

HEAT

EXCHANGE

RECEIVER

DRIER

STRAINER

EXPANSION VALVE

EVAPORATOR

HARVEST

SOLENOID VALVE

SV1512

Section 7 Refrigeration System

Part No. 80-1100-3 7-7

Figure 7-7. Q1300/Q1600/Q1800 Remote Models

NOTE: The refrigeration sequence for remote dual

expansion valve ice machines is identical to remote

single expansion valve ice machines. See Pages 7-3,

7-4 and 7-5 for sequence of operation.

COMPRESSOR

HEAT

EXCHANGE

DRIER

CHECK VALVE

RECEIVER

HEAD

PRESSURE

CONTROL

VALVE

H.P.R. SOLENOID

REGULATING VALVE

HARVEST PRESSURE

REMOTE

CONDENSER

CHECK VALVE

VALVE

RECEIVER

SERVICE

SOLENOID

LINE

LIQUID

VALVE

EXPANSION VALVE

EVAPORATOR

EXPANSION VALVE

STRAINER

HARVEST

SOLENOID VALVE

HARVEST

SV1513

Refrigeration System Section 7

7-8 Part No. 80-1100-3

Operational Analysis (Diagnostics)

GENERAL

When analyzing the refrigeration system, it is important

to understand that different refrigeration component

malfunctions may cause very similar symptoms.

Also, many external factors can make good refrigeration

components appear bad. These factors can include

improper installation, or water system malfunctions such

as hot incoming water supply or water loss.

The following two examples illustrate how similar

symptoms can result in a misdiagnosis.

1. An expansion valve bulb that is not securely

fastened to the suction line and/or not insulated will

cause a good expansion valve to flood. If a service

technician fails to check for proper expansion valve

bulb mounting, he may replace the expansion valve

in error.

The ice machine now functions normally. The

technician erroneously thinks that the problem was

properly diagnosed and corrected by replacing the

expansion valve. Actually, the problem (loose bulb)

was corrected when the technician properly

mounted the bulb of the replacement expansion

valve.

The service technician’s failure to check the

expansion valve bulb for proper mounting (an

external check) resulted in a misdiagnosis and the

needless replacement of a good expansion valve.

2. An ice machine that is low on charge may cause a

good expansion valve to starve. If a service

technician fails to verify the system charge, he may

replace the expansion valve in error.

During the replacement procedure, recovery,

evacuation and recharging are performed correctly.

The ice machine now functions normally. The

technician erroneously thinks that the problem was

properly diagnosed and corrected by replacing the

expansion valve.

The service technician’s failure to check the ice

machine for a low charge condition resulted in a

misdiagnosis and the needless replacement of a

good expansion valve.

When analyzing the refrigeration system, use the

Refrigeration System Operational Analysis Table. This

table, along with detailed checklists and references, will

help prevent replacing good refrigeration components

due to external problems.

Section 7 Refrigeration System

Part No. 80-1100-3 7-9

BEFORE BEGINNING SERVICE

Ice machines may experience operational problems only

during certain times of the day or night. A machine may

function properly while it is being serviced, but

malfunctions later. Information provided by the user can

help the technician start in the right direction, and may

be a determining factor in the final diagnosis.

Ask these questions before beginning service:

• When does the ice machine malfunction? (night, day,

all the time, only during the freeze cycle, etc.)

• When do you notice low ice production? (one day a

week, every day, on weekends, etc.)

• Can you describe exactly what the ice machine

seems to be doing?

• Has anyone been working on the ice machine?

• Is anything (such as boxes) usually stored near or on

the ice machine which could obstruct airflow around

the machine?

• During “store shutdown,” is the circuit breaker, water

supply or air temperature altered?

• Is there any reason why incoming water pressure

might rise or drop substantially?

ICE PRODUCTION CHECK

The amount of ice a machine produces directly relates to

the operating water and air temperatures. This means

an ice machine in a 70°F (21.1°C) room with 50°F

(10.0°C) water produces more ice than the same model

ice machine in a 90°F (32.2°C) room with 70°F (21.1°C)

water.

1. Determine the ice machine operating conditions:

Air temp. entering condenser: _______ °

Air temp. around ice machine: _______ °

Water temp. entering sump trough: _______ °

2. Refer to the appropriate 24 Hour Ice Production

Chart. (These charts begin on Page 7-33.) Use the

operating conditions determined in Step 1 to find

published 24 hour ice production: ______

3. Perform an actual ice production check. Use the

formula below.

4. Compare the results of step 3 with step 2. Ice

production is normal when these numbers match

closely. If they match closely, determine if:

• another ice machine is required.

• more storage capacity is required.

• relocating the existing equipment to lower the

load conditions is required.

Contact the local Manitowoc distributor for

information on available options and accessories.

1. __________

Freeze Time

+ __________

Harvest Time

= __________

Total Cycle Time

2. 1440

Minutes in 24

Hours

÷ __________

Total Cycle Time

= __________

Cycles Per Day

3. __________

Weight of One

Harvest

x __________

Cycles Per Day

= __________

Actual 24 Hour Ice

Production

Important

Times are in minutes.

Example: 1 min., 15 sec. converts to 1.25 min.

(15 seconds ÷ 60 seconds = .25 minutes)

Weights are in pounds.

Example: 2 lb., 6 oz. converts to 2.375 lb.

(6 oz. ÷ 16 oz. = .375 lb.)

Weighing the ice is the only 100% accurate

check. However, if the ice pattern is normal and the

1/8" thickness is maintained, the ice slab weights

listed with the 24 Hour Ice Production Charts may

be used.

Refrigeration System Section 7

7-10 Part No. 80-1100-3

INSTALLATION/VISUAL INSPECTION CHECKLIST WATER SYSTEM CHECKLIST

A water-related problem often causes the same

symptoms as a refrigeration system component

malfunction.

Example: A water dump valve leaking during the freeze

cycle, a system low on charge, and a starving TXV have

similar symptoms.

Water system problems must be identified and

eliminated prior to replacing refrigeration components.

Possible Problem Corrective Action

Ice machine is not level Level the ice machine

Improper clearance around

top, sides and/or back of ice

machine

Reinstall according to the

Installation Manual

Air-cooled condenser filter is

dirty Clean the condenser filter

and/or condenser

Ice machine is not on an

independent electrical circuit Reinstall according to the

Installation Manual

Water filtration is plugged (if

used) Install a new water filter

Water drains are not run

separately and/or are not

vented

Run and vent drains

according to the Installation

Manual

Remote condenser line set is

improperly installed Reinstall according to the

Installation Manual

Possible Problem Corrective Action

Water area (evaporator) is

dirty Clean as needed

Water inlet pressure not

between 20 and 80 psi Install a water regulator valve

or increase the water

pressure

Incoming water temperature

is not between 35°F (1.7°C)

and 90°F (32.2°C).

If too hot, check the hot water

line check valves in other

store equipment

Water filtration is plugged (if

used) Install a new water filter

Water dump valve leaking

during the freeze cycle Clean/replace dump valve as

needed

Vent tube is not installed on

water outlet drain See Installation Instructions

Hoses, fittings, etc., are

leaking water Repair/replace as needed

Water fill valve is stuck open Clean/replace as needed

Water is spraying out of the

sump trough area Stop the water spray

Uneven water flow across the

evaporator Clean the ice machine

Water is freezing behind the

evaporator Correct the water flow

Plastic extrusions and

gaskets are not secured to

the evaporator

Remount/replace as needed

Water does not flow over the

evaporator (not trickle)

immediately after the prechill

Clean/replace water level

probe as needed

Section 7 Refrigeration System

Part No. 80-1100-3 7-11

ICE FORMATION PATTERN

Evaporator ice formation pattern analysis is helpful in ice

machine diagnostics.

Analyzing the ice formation pattern alone cannot

diagnose an ice machine malfunction. However, when

this analysis is used along with Manitowoc’s

Refrigeration System Operational Analysis Table, it can

help diagnose an ice machine malfunction.

Improper ice formation can be caused by any number of

problems.

Example: An ice formation that is “extremely thin on

outlet” could be caused by a hot water supply, a dump

valve leaking water, a faulty water fill valve, a low

refrigerant charge, etc.

1. Normal Ice Formation

Ice forms across the entire evaporator surface.

At the beginning of the freeze cycle, it may appear that

more ice is forming on the intlet of the evaporator than

on the outlet. At the end of the freeze cycle, ice

formation on the outlet will be close to, or just a bit

thinner than, ice formation on the intlet. The dimples in

the cubes at the outlet of the evaporator may be more

pronounced than those on the intlet. This is normal.

The ice thickness probe must be set to maintain the ice

bridge thickness at approximately 1/8". If ice forms

uniformly across the evaporator surface, but does not

reach 1/8" in the proper amount of time, this is still

considered normal.

2. Extremely Thin at Evaporator Outlet

There is no ice, or a considerable lack of ice formation

on the outlet of the evaporator (tubing outlet).

Examples: No ice at all on the outlet of the evaporator,

but ice forms on the intlet half of the evaporator. Or, the

ice at the outlet of the evaporator reaches 1/8" to initiate

a harvest, but the intlet of the evaporator already has

1/2" to 1" of ice formation.

Figure 7-8. Extremely Thin Ice Formation at

Evaporator Outlet

Important

Keep the water curtain in place while checking the

ice formation pattern to ensure no water is lost.

SV1576

OUTLET

INLET

ICE

Refrigeration System Section 7

7-12 Part No. 80-1100-3

3. Extremely Thin at Evaporator Inlet

There is no ice, or a considerable lack of ice formation

on the intlet of the evaporator (tubing inlet). Examples:

The ice at the outlet of the evaporator reaches 1/8" to

initiate a harvest, but there is no ice formation at all on

the intlet of the evaporator.

Figure 7-9. Extremely Thin Ice Formation at

Evaporator Inlet

4. Spotty Ice Formation

There are small sections on the evaporator where there

is no ice formation. This could be a single corner, or a

single spot in the middle of the evaporator. This is

generally caused by loss of heat transfer from the tubing

on the back side of the evaporator.

Figure 7-10. Spotty Ice Formation

5. No Ice Formation

The ice machine operates for an extended period, but

there is no ice formation at all on the evaporator.

Figure 7-11. Q1300/Q1600/Q1800 Evaporator Tubing

SV1575

OUTLET

INLET

ICE

SV1577

OUTLET

INLET

ICE

Important

The Q1300 Q1600 and Q1800 model machines

have left and right expansion valves and separate

evaporator circuits. These circuits operate

independently from each other. Therefore, one may

operate properly while the other is malfunctioning.

Example: If the left expansion valve is starving, it

may not affect the ice formation pattern on the entire

right side of the evaporator.

SV1571

OUTLET

INLET

OUTLET

INLET

Section 7 Refrigeration System

Part No. 80-1100-3 7-13

SAFETY LIMITS

General

In addition to standard safety controls, such as high

pressure cut-out, the control board has two built in safety

limit controls which protect the ice machine from major

component failures. There are two control boards with

different safety limit sequences. Original production

control boards have a black micro-processor. Current

production and replacement control boards have an

orange label on the control board microprocessor.

Safety Limit #1: If the freeze time reaches 60 minutes,

the control board automatically initiates a harvest cycle.

Control Board with black microprocessor

If 3 consecutive 60-minute freeze cycles occur, the ice

machine stops.

Control Board with orange label on microprocessor.

If 6 consecutive 60-minute freeze cycles occur, the ice

machine stops.

Safety Limit #2: If the harvest time reaches 3.5

minutes, the control board automatically returns the ice

machine to the freeze cycle.

Control Board with black microprocessor

If three consecutive 3.5 minute harvest cycles occur, the

ice machine stops.

Control Board with orange label on microprocessor.

If 500 consecutive 3.5 minute harvest cycles occur, the

ice machine stops.

Safety Limit Indication

Control Board with Black Microprocessor

When a safety limit condition is exceeded for 3

consecutive cycles the ice machine stops and the

harvest light on the control board continually flashes on

and off. Use the following procedures to determine

which safety limit has stopped the ice machine.

1. Move the toggle switch to OFF.

2. Move the toggle switch back to ICE.

3. Watch the harvest light. It will flash one or two times,

corresponding to safety limits 1 and 2, to indicate

which safety limit stopped the ice machine.

After safety limit indication, the ice machine will restart

and run until a safety limit is exceeded again.

Control Board with Orange Label

When a safety limit condition is exceeded for 3

consecutive cycles the control board enters the limit into

memory and the ice machine continues to run. Use the

following procedures to determine if the control board

contains a safety limit indication.

1. Move the toggle switch to OFF.

2. Move the toggle switch back to ICE.

3. Watch the harvest light. If a safety limit has been

recorded, the harvest light will flash one or two

times, corresponding to safety limit 1 or 2.

When a safety limit condition is exceeded (6 consecutive

cycles for Safety Limit #1 or 500 cycles for Safety Limit

#2) the ice machine stops and the harvest light on the

control board continually flashes on and off. Use the

following procedures to determine which safety limit has

stopped the machine.

1. Move the toggle switch to OFF.

2. Move the toggle switch back to ICE.

3. Watch the harvest light. It will flash one or two times,

corresponding to safety limit 1 or 2 to indicate which

safety limit stopped the ice machine.

After safety limit indication, the ice machine will restart

and run until a safety limit is exceeded again.

Orange Label

Refrigeration System Section 7

7-14 Part No. 80-1100-3

Analyzing Why Safety Limits May Stop the Ice

Machine

According to the refrigeration industry, a high percentage

of compressors fail as a result of external causes. These

can include: flooding or starving expansion valves, dirty

condensers, water loss to the ice machine, etc. The

safety limits protect the ice machine (primarily the

compressor) from external failures by stopping ice

machine operation before major component damage

occurs.

The safety limit system is similar to a high pressure cut-

out control. It stops the ice machine, but does not tell

what is wrong. The service technician must analyze the

system to determine what caused the high pressure cut-

out, or a particular safety limit, to stop the ice machine.

The safety limits are designed to stop the ice machine

prior to major component failures, most often a minor

problem or something external to the ice machine. This

may be difficult to diagnose, as many external problems

occur intermittently.

Example: An ice machine stops intermittently on safety

limit #1 (long freeze times). The problem could be a low

ambient temperature at night, a water pressure drop, the

water is turned off one night a week, etc.

When a high pressure cut-out or a safety limit stops the

ice machine, they are doing what they are supposed to

do. That is, stopping the ice machine before a major

component failure occurs.

Refrigeration and electrical component failures may also

trip a safety limit. Eliminate all electrical components and

external causes first. If it appears that the refrigeration

system is causing the problem, use Manitowoc’s

Refrigeration System Operational Analysis Table, along

with detailed charts, checklists, and other references to

determine the cause.

The following checklists are designed to assist the

service technician in analysis. However, because there

are many possible external problems, do not limit your

diagnosis to only the items listed.

Section 7 Refrigeration System

Part No. 80-1100-3 7-15

Safety Limit #1

Refer to page 7-13 for control board identification and safety limit operation.

Control Board with Black Microprocessor - Freeze Time exceeds 60 minutes for 3 consecutive freeze cycles

Control Board with Orange Label on Microprocessor - Freeze time exceeds 60 minutes for 6 consecutive freeze

cycles.

SAFETY LIMIT NOTES

• Because there are many possible external problems,

do not limit your diagnosis to only the items listed in

this chart.

• A continuous run of 100 harvests automatically

erases the safety limit code.

• The control board will store and indicate only one

safety limit – the last one exceeded.

• If the toggle switch is moved to the OFF position and

then back to the ICE position prior to reaching the

100-harvest point, the last safety limit exceeded will

be indicated.

• If the harvest light did not flash prior to the ice

machine restarting, then the ice machine did not stop

because it exceeded a safety limit.

Possible Cause Check/Correct

Improper installation See “Installation/Visual Inspection Checklist” on Page 7-10

Water system Low water pressure (20 psi min.)

High water pressure (80 psi max.)

High water temperature (90°F/32.2°C max.)

Clogged water distribution tube

Dirty/defective water fill valve

Dirty/defective water dump valve

Defective water pump

Electrical system Ice thickness probe out of adjustment

Harvest cycle not initiated electrically

Contactor not energizing

Compressor electrically non-operational

Restricted condenser

air flow (air-cooled models)

High inlet air temperature (110°F/43.3°C max.)

Condenser discharge air recirculation

Dirty condenser filter

Dirty condenser fins

Defective fan cycling control

Defective fan motor

Restricted condenser water flow (water-cooled models) Low water pressure (20 psi min.)

High water temperature (90°F/32.2°C max.)

Dirty condenser

Dirty/defective water regulating valve

Water regulating valve out of adjustment

Refrigeration system Non-Manitowoc components

Improper refrigerant charge

Defective head pressure control (remotes)

Defective harvest valve

Defective compressor

TXV starving or flooding (check bulb mounting)

Non-condensables in refrigeration system

Plugged or restricted high side refrigerant lines or component

Refrigeration System Section 7

7-16 Part No. 80-1100-3

Safety Limit #2

Refer to page 7-13 for control board identification and safety limit operation.

Control Board with Black Microprocessor - Harvest time exceeds 3.5 minutes for 3 consecutive harvest cycles.

Control Board with Orange Label on Microprocessor - Harvest time exceeds 3.5 minutes for 500 consecutive

harvest cycles.

SAFETY LIMIT NOTES

• Because there are many possible external problems,

do not limit your diagnosis to only the items listed in

this chart.

• A continuous run of 100 harvests automatically

erases the safety limit code.

• The control board will store and indicate only one

safety limit – the last one exceeded.

• If the toggle switch is moved to the OFF position and

then back to the ICE position prior to reaching the

100-harvest point, the last safety limit exceeded will

be indicated.

• If the harvest light did not flash prior to the ice

machine restarting, then the ice machine did not stop

because it exceeded a safety limit.

Possible Cause Check/Correct

Improper installation See “Installation/Visual Inspection Checklist” on Page 7-10

Water system Water area (evaporator) dirty

Dirty/defective water dump valve

Vent tube not installed on water outlet drain

Water freezing behind evaporator

Plastic extrusions and gaskets not securely mounted to the

evaporator

Low water pressure (20 psi min.)

Loss of water from sump area

Clogged water distribution tube

Dirty/defective water fill valve

Defective water pump

Electrical system Ice thickness probe out of adjustment

Ice thickness probe dirty

Bin switch defective

Premature harvest

Refrigeration system Non-Manitowoc components

Water regulating valve dirty/defective

Improper refrigerant charge

Defective head pressure control valve (remotes)

Defective harvest pressure control (HPR) valve (remotes)

Defective harvest valve

TXV flooding (check bulb mounting)

Defective fan cycling control

Section 7 Refrigeration System

Part No. 80-1100-3 7-17

ANALYZING DISCHARGE PRESSURE

DURING FREEZE OR HARVEST CYCLE

Procedure

1. Determine the ice machine operating conditions:

Air temp. entering condenser ______

Air temp. around ice machine ______

Water temp. entering sump trough ______

2. Refer to Operating Pressure Chart for ice machine

being checked. (These charts begin on Page 7-33.)

Use the operating conditions determined in step 1 to

find the published normal discharge pressures.

Freeze Cycle _______ Harvest Cycle_______

3. Perform an actual discharge pressure check.

4. Compare the actual discharge pressure (step 3) with

the published discharge pressure (step 2).

The discharge pressure is normal when the actual

pressure falls within the published pressure range for the

ice machine’s operating conditions.

Freeze Cycle Discharge Pressure High Checklist

Freeze Cycle Discharge Pressure Low Checklist

NOTE: Do not limit your diagnosis to only the items listed in the checklists.

Freeze

Cycle PSIG Harvest

Cycle PSIG

Beginning of Cycle __________ __________

Middle of Cycle __________ __________

End of Cycle __________ __________

Possible Cause Check/Correct

Improper installation See “Installation/Visual Inspection Checklist” on Page 7-10

Restricted condenser air flow (air-cooled models) High inlet air temperature (110°F/43.3°C max.)

Condenser discharge air recirculation

Dirty condenser filter

Dirty condenser fins

Defective fan cycling control

Defective fan motor

Restricted condenser water flow (water-cooled

models) Low water pressure (20 psi min.)

High inlet water temperature (90°F/32.2°C max.)

Dirty condenser

Dirty/defective water regulating valve

Water regulating valve out of adjustment

Improper refrigerant charge Overcharged

Non-condensables in system

Wrong type of refrigerant

Other Non-Manitowoc components in system

High side refrigerant lines/component restricted (before mid-condenser)

Defective head pressure control valve (remote models)

Possible Cause Check/Correct

Improper installation See “Installation/Visual Inspection Checklist” on Page 7-10

Improper refrigerant charge Undercharged

Wrong type of refrigerant

Water regulating valve (water-cooled condensers) Out of adjustment

Defective

Other Non-Manitowoc components in system

Defective head pressure control valve (remote models)

Defective fan cycle control

Refrigeration System Section 7

7-18 Part No. 80-1100-3

ANALYZING SUCTION PRESSURE

DURING FREEZE CYCLE

The suction pressure gradually drops throughout the

freeze cycle. The actual suction pressure (and drop rate)

changes as the air and water temperatures entering the

ice machine change. This affects freeze cycle times.

To analyze and identify the proper suction pressure drop

throughout the freeze cycle, compare the published

suction pressure to the published freeze cycle time.

“Operating Pressure” and “Freeze Cycle Time” charts

can be found later in this section.

NOTE: Analyze discharge pressure before analyzing

suction pressure. High or low discharge pressure may

be causing high or low suction pressure.

Procedure

Step Example Using QY0454A Model Ice Machine

1. Determine the ice machine operating

conditions.

Air temp. entering condenser: 90°F/32.2°C

Air temp. around ice machine: 80°F/26.7°C

Water temp. entering water fill valve: 70°F/21.1°C

2A. Refer to “Cycle Time” and “Operating

Pressure” charts for ice machine model being

checked. Using operating conditions from Step

1, determine published freeze cycle time and

published freeze cycle suction pressure.

Published freeze cycle time: Published freeze cycle suction pressure:

13.7 - 14.1 minutes 55-36 PSIG

2B. Compare the published freeze cycle time

and published freeze cycle suction pressure.

Develop a chart.

Published Freeze Cycle Time (minutes)

1 3 5 7 9 12 14

55 52 48 44 41 38 36

Published Freeze Cycle Suction Pressure (psig)

3. Perform an actual suction pressure check at

the beginning, middle and end of the freeze

cycle. Note the times at which the readings are

taken.

Beginning of freeze cycle: 59 PSIG at 1 minute

Middle of freeze cycle: 48 PSIG at 7 minutes

End of freeze cycle: 40 PSIG at 14 minutes

4. Compare the actual freeze cycle suction

pressure (Step 3) to the published freeze cycle

time and pressure comparison (Step 2B).

Determine if the suction pressure is high, low

or acceptable.

Time Into

Freeze Cycle Published

Pressure Actual

Pressure Result

1 minutes

7 minutes

14 minutes

55 PSIG

44 PSIG

36 PSIG

59 PSIG

48 PSIG

40 PSIG

High

Section 7 Refrigeration System

Part No. 80-1100-3 7-19

Freeze Cycle Suction Pressure High Checklist

Freeze Cycle Suction Pressure Low Checklist

NOTE: Do not limit your diagnosis to only the items

listed in the checklists.

Possible Cause Check/Correct

Improper installation See “Installation/Visual Inspection Checklist” on Page 7-10

Discharge pressure Discharge pressure is too high, and is affecting low side

(See “Freeze Cycle Discharge Pressure High Checklist” on Page 7-16)

Improper refrigerant charge Overcharged

Wrong type of refrigerant

Other Non-Manitowoc components in system

H.P.R. solenoid leaking

harvest valve stuck open

TXV flooding (check bulb mounting)

Defective compressor

Possible Cause Check/Correct

Improper installation See “Installation/Visual Inspection Checklist” on Page 7-10

Discharge pressure Discharge pressure is too low, and is affecting low side

(See “Freeze Cycle Discharge Pressure Low Checklist” on Page 7-16)

Improper refrigerant charge Undercharged

Wrong type of refrigerant

Other Non-Manitowoc components in system

Improper water supply over evaporator (See “Water System Checklist” on page 7-10)

Loss of heat transfer from tubing on back side of evaporator

Restricted/plugged liquid line drier

Restricted/plugged tubing in suction side of refrigeration system

TXV starving

Refrigeration System Section 7

7-20 Part No. 80-1100-3

SINGLE EXPANSION VALVE ICE MACHINES -

COMPARING EVAPORATOR INLET AND

OUTLET TEMPERATURES

NOTE: This procedure will not work on the dual

expansion valve Q1300 Q1600 and Q1800 ice

machines.

The temperatures of the suction lines entering and

leaving the evaporator alone cannot diagnose an ice

machine. However, comparing these temperatures

during the freeze cycle, along with using Manitowoc’s

Refrigeration System Operational Analysis Table, can

help diagnose an ice machine malfunction.

The actual temperatures entering and leaving the

evaporator vary by model, and change throughout the

freeze cycle. This makes documenting the “normal” inlet

and outlet temperature readings difficult. The key to the

diagnosis lies in the difference between the two

temperatures five minutes into the freeze cycle. These

temperatures must be within 7° of each other.

Use this procedure to document freeze cycle inlet and

outlet temperatures.

1. Use a quality temperature meter, capable of taking

temperature readings on curved copper lines.

2. Attach the temperature meter sensing device to the

copper lines entering and leaving the evaporator.

3. Wait five minutes into the freeze cycle.

4. Record the temperatures below and determine the

difference between them.

5. Use this with other information gathered on the

Refrigeration System Operational Analysis Table to

determine the ice machine malfunction.

Important

Do not simply insert the sensing device under the

insulation. It must be attached to and reading the

actual temperature of the copper line.

______________

Inlet Temperature ______________

Outlet Temperature

_______________

Difference

Must be within 7° at 5

minutes into freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-21

HARVEST VALVE TEMPERATURE CHECK

NOTE: This procedure requires checking both harvest

valves on dual expansion valve Q1300 and Q1800 ice

machines.

General

A harvest valve requires a critical orifice size. This

meters the amount of hot gas flowing into the evaporator

during the harvest cycle. If the orifice is even slightly too

large or too small, long harvest cycles will result.

A too-large orifice causes refrigerant to condense to

liquid in the evaporator during the harvest cycle. This

liquid will cause compressor damage. A too-small orifice

does not allow enough hot gas into the evaporator. This

causes low suction pressure, and insufficient heat for a

harvest cycle.

Refer to the Parts Manual for proper valve application. If

replacement is necessary, Use only “original” Manitowoc

replacement parts.

Harvest Valve Analysis

Symptoms of a harvest valve remaining partially open

during the freeze cycle can be similar to symptoms of

either an expansion valve or compressor problem. The

best way to diagnose a harvest valve is by using

Manitowoc’s Ice Machine Refrigeration System

Operational Analysis Table.

Use the following procedure and table to help determine

if a harvest valve is remaining partially open during the

freeze cycle.

1. Wait five minutes into the freeze cycle.

2. Feel the inlet of the harvest valve(s).

3. Feel the compressor discharge line.

4. Compare the temperature of the inlet of the harvest

valves to the temperature of the compressor

discharge line.

Important

Feeling the harvest valve outlet or across the

harvest valve itself will not work for this comparison.

The harvest valve outlet is on the suction side (cool

refrigerant). It may be cool enough to touch even if

the valve is leaking.

Warning

The inlet of the harvest valve and the compressor

discharge line could be hot enough to burn your

hand. Just touch them momentarily.

Findings Comments

The inlet of the

harvest valve is cool

enough to touch and

the compressor

discharge line is hot.

This is normal as the discharge line

should always be too hot to touch and

the harvestharvest valve inlet,

although too hot to touch during

harvest, should be cool enough to

touch after 5 minutes into the freeze

cycle.

The inlet of the

harvest valve is hot

and approaches the

temperature of a hot

compressor

discharge line.

This is an indication something is

wrong, as the harvest valve inlet did

not cool down during the freeze cycle.

If the compressor dome is also entirely

hot, the problem is not a harvest valve

leaking, but rather something causing

the compressor (and the entire ice

machine) to get hot.

Both the inlet of the

harvest valve and

the compressor

discharge line are

cool enough to

touch.

This is an indication something is

wrong, causing the compressor

discharge line to be cool to the touch.

This is not caused by a harvest valve

leaking.

Refrigeration System Section 7

7-22 Part No. 80-1100-3

DISCHARGE LINE TEMPERATURE ANALYSIS

General

Knowing if the discharge line temperature is increasing,

decreasing or remaining constant can be an important

diagnostic tool. Maximum compressor discharge line

temperature on a normally operating ice machine

steadily increases throughout the freeze cycle.

Comparing the temperatures over several cycles will

result in a consistent maximum discharge line

temperature.

Ambient air temperatures affect the maximum discharge

line temperature.

Higher ambient air temperatures at the condenser =

higher discharge line temperatures at the compressor.

Lower ambient air temperatures at the condenser =

lower discharge line temperatures at the compressor.

Regardless of ambient temperature, the freeze cycle

discharge line temperature will be higher than 160°F

(71.1°C) on a normally operating ice machine.

Procedure

Connect a temperature probe on the compressor

discharge line with-in 6" of the compressor and insulate.

Observe the discharge line temperature for the last three

minutes of the freeze cycle and record the maximum

discharge line temperature.

Discharge Line Temperature Above 160°F (71.1°C) At

End Of Freeze Cycle:

Ice machines that are operating normally will have

consistent maximum discharge line temperatures above

160°F (71.1°C).

Discharge Line Temperature Below 160°F (71.1°C) At

End Of Freeze Cycle

Ice machines that have a flooding expansion valve will

have a maximum discharge line temperature that

decreases each cycle.

Verify the expansion valve sensing bulb is 100%

insulated and sealed airtight. Condenser air contacting

an incorrectly insulated sensing bulb will cause

overfeeding of the expansion valve.

Verify the expansion valve sensing bulb is positioned

and secured correctly.

Section 7 Refrigeration System

Part No. 80-1100-3 7-23

THIS PAGE INTENTIONALLY LEFT BLANK

Refrigeration System Section 7

7-24 Part No. 80-1100-3

HOW TO USE THE REFRIGERATION SYSTEM

OPERATIONAL ANALYSIS TABLES

General

These tables must be used with charts, checklists and

other references to eliminate refrigeration components

not listed on the tables and external items and problems

which can cause good refrigeration components to

appear defective.

The tables list five different defects that may affect the

ice machine’s operation.

NOTE: A low-on-charge ice machine and a starving

expansion valve have very similar characteristics and

are listed under the same column.

NOTE: Before starting, see “Before Beginning Service”

on Page 7-9 for a few questions to ask when talking to

the ice machine owner.

Procedure

Step 1 Complete the “Operation Analysis” column.

Read down the left “Operational Analysis” column.

Perform all procedures and check all information listed.

Each item in this column has supporting reference

material to help analyze each step.

While analyzing each item separately, you may find an

“external problem” causing a good refrigerant

component to appear bad. Correct problems as they are

found. If the operational problem is found, it is not

necessary to complete the remaining procedures.

Step 2 Enter check marks (√) in the small boxes.

Each time the actual findings of an item in the

“Operational Analysis” column matches the published

findings on the table, enter a check mark.

Example: Freeze cycle suction pressure is determined

to be low. Enter a check mark in the “low” box.

Step 3 Add the check marks listed under each of the

four columns. Note the column number with the highest

total and proceed to “Final Analysis.”

NOTE: If two columns have matching high numbers, a

procedure was not performed properly and/or supporting

material was not analyzed correctly.

Final Analysis

The column with the highest number of check marks

identifies the refrigeration problem.

COLUMN 1 - HARVEST VALVE LEAKING

A leaking harvest valve must be replaced.

COLUMN 2 - LOW CHARGE/TXV STARVING

Normally, a starving expansion valve only affects the

freeze cycle pressures, not the harvest cycle pressures.

A low refrigerant charge normally affects both pressures.

Verify the ice machine is not low on charge before

replacing an expansion valve.

1. Add refrigerant charge in 2 to 4 oz. increments as a

diagnostic procedure to verify a low charge. If the

problem is corrected, the ice machine is low on

charge. Find the refrigerant leak.

The ice machine must operate with the nameplate

charge. If the leak cannot be found, proper

refrigerant procedures must still be followed Change

the liquid line drier. Then, evacuate and weigh in the

proper charge.

2. If the problem is not corrected by adding charge, the

expansion valve is faulty.

On dual expansion valve ice machines, change only

the TXV that is starving. If both TXV’s are starving,

they are probably good, and are being affected by

some other malfunction, such as low charge.

COLUMN 3 - TXV FLOODING

A loose or improperly mounted expansion valve bulb

causes the expansion valve to flood. Check bulb

mounting, insulation, etc., before changing the valve. On

dual expansion valve machines, the service technician

should be able to tell which TXV is flooding by analyzing

ice formation patterns. Change only the flooding

expansion valve.

COLUMN 4 - COMPRESSOR

Replace the compressor and start components. To

receive warranty credit, the compressor ports must be

properly sealed by crimping and soldering them closed.

Old start components must be returned with the faulty

compressor.

Section 7 Refrigeration System

Part No. 80-1100-3 7-25

REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES

Q, J and B Model Single Expansion Valve

This table must be used with charts, checklists and other references to eliminate

refrigeration components not listed on the table and external items and problems,

which can cause good refrigeration components to appear defective.

Operational Analysis 1234

Ice Production Air-Temperature Entering Condenser_____________

Water Temperature Entering Ice Machine_________

Published 24 hour ice production________________

Calculated (actual) ice production_______________

NOTE: The ice machine is operating properly if the ice fill patterns is normal and ice production is within 10% of charted

capacity.

Installation and Water

System

All installation and water related problems must be corrected before proceeding with chart.

Ice Formation Pattern Ice formation is extremely

thin on outlet of evaporator

-or-

No ice formation on the

entire evaporator

Ice formation is extremely

thin on outlet of evaporator

-or-

No ice formation on entire

evaporator

Ice formation normal

-or-

Ice formation is extremely

thin on inlet of evaporator

-or-

No ice formation on entire

evaporator

Ice formation normal

-or-

No ice formation on entire

evaporator

Safety Limits

Refer to “Analyzing Safety

Limits” to eliminate all non-

refrigeration problems.

Stops on safety limit:

1Stops on safety limit:

1 or 2 Stops on safety limit:

Freeze Cycle

Discharge Pressure

_____ ______ ______

1 minute Middle End

into cycle

If discharge pressure is High or Low refer to freeze cycle high or low discharge pressure problem checklist to eliminate

problems and/or components not listed on this table before proceeding.

Freeze Cycle

Suction Pressure

_____ ______ ______

1 minute Middle End

If suction pressure is High or Low refer to freeze cycle high or low suction pressure problem checklist to eliminate problems

and/or components not listed on this table before proceeding.

Suction pressure is High Suction pressure is Low or

Normal Suction pressure is High Suction pressure is High

Wait 5 minutes into the freeze

cycle.

Compare temperatures of

evaporator inlet and

evaporator outlet.

Inlet ____ ° F (° C)

Outlet ____ ° F (° C)

Difference ____ ° F (° C)

Inlet and outlet

within 7°

of each other

Inlet and outlet

not within 7°

of each other

-and-

Inlet is colder than outlet

Inlet and outlet

within 7°

of each other

-or-

Inlet and outlet

not within 7°

of each other

-and-

Inlet is warmer than outlet

Inlet and outlet

within 7°

of each other

Wait 5 minutes into the freeze

cycle.

Compare temperatures of

compressor discharge line

and harvest valve inlet.

The harvest valve inlet is

Hot

-and-

approaches the temperature

of a Hot compressor

discharge line.

The harvest valve inlet is

Cool enough to hold hand

-and-

the compressor discharge

line is Hot.

The harvest valve inlet is

Cool enough to hold hand

-and-

the compressor discharge

line is Cool

enough to hold hand on.

The harvest valve inlet is

Cool enough to hold hand

-and-

the compressor discharge

line is Hot.

Discharge Line Temperature

Record freeze cycle discharge

line temperature at the end of

the freeze cycle

_________°F (°C)

Discharge line temperature

160°F (71.1°C)

or higher

at the end of the freeze

cycle

Discharge line temperature

160°F (71.1°C)

or higher

at the end of the freeze

cycle

Discharge line temperature

less than

160°F (71.1°C)

at the end of the freeze

cycle

Discharge line temperature

160°F (71.1°C)

or higher at the end of the

freeze cycle

Final Analysis

Enter total number of boxes

checked in each column.

Harvest Valve Leaking Low On Charge

-Or-

TXV Starving TXV Flooding Compressor

Refrigeration System Section 7

7-26 Part No. 80-1100-3

Q and J Model Dual Expansion Valve

This table must be used with charts, checklists and other references to eliminate

refrigeration components not listed on the table and external items and problems,

which can cause good refrigeration components to appear defective.

Operational Analysis 1234

Ice Production Air-Temperature Entering Condenser____________

Water Temperature Entering Ice Machine_________

Published 24 hour ice production________________

Calculated (actual) ice production________________

NOTE: The ice machine is operating properly if the ice production

and ice formation pattern is normal and ice production is within 10% of charted capacity.

Ice Formation Pattern

Left side_____________

___________________

Right side ___________

___________________

Ice formation is

extremely thin on

outet of one side of

evaporator

-or-

No ice formation on

one side of

evaporator

Ice formation is

extremely thin on

outlet of one or both

sides of evaporator

-or-

No ice formation on

entire evaporator

Ice formation normal

-or-

Ice formation is

extremely thin on inlet

of one side of

evaporator

-or-

No ice formation on

entire evaporator

Ice formation normal

-or-

No ice formation on

entire evaporator

Safety limits

Refer to “Analyzing Safety

Limits” to eliminate problems

and/or components not listed

on this table

Stops on safety limit:

1Stops on safety limit:

1 or 2 Stops on safety limit:

Freeze Cycle

DISCHARGE pressure

_____ ______ ______

1 minute Middle End

into cycle

If discharge pressure is High or Low refer to a freeze cycle high or low discharge pressure

problem checklist to eliminate problems and/or components not listed on this table before

proceeding.

Freeze Cycle

SUCTION pressure

_____ ______ ______

Beginning Middle End

If suction pressure is High or Low refer to a freeze cycle high or low suction pressure problem

checklist to eliminate problems and/or components not listed on this table before proceeding.

Suction pressure is

High Suction pressure is

Low or Normal Suction pressure is

High Suction pressure is

High

Harvest Valve

Wait 5 minutes into the freeze

cycle.

Compare temperatures of

compressor discharge line

and both harvest valve inlets.

One harvest valve

inlet is Hot

-and-

approaches the

temperature of a Hot

compressor

discharge line.

Both harvest valve

inlets are

Cool enough

to hold hand on

-and-

the compressor

discharge line is Hot.

Both harvest valve

inlets are Cool

enough

to hold hand on

-and-

the compressor

discharge line is

Cool enough

to hold hand on.

Both harvest valve

inlets are Cool

enough

to hold hand on

-and-

the compressor

discharge line is Hot.

Discharge Line Temperature

Record freeze cycle discharge

line temperature at the end of

the freeze cycle

_________°F (°C)

Discharge line

temperature

160°F (71.1°C)

or higher

at the end of the

freeze cycle

Discharge line

temperature

160°F (71.1°C)

or higher

at the end of the

freeze cycle

Discharge line

temperature

less than

160°F (71.1°C)

at the end of the

freeze cycle

Discharge line

temperature

160°F (71.1°C)

or higher

at the end of the

freeze cycle

Final Analysis

Enter total number of boxes

checked in each column.

Harvest Valve

Leaking Low On Charge

-Or-

TXV Starving

TXV Flooding Compressor

Section 7 Refrigeration System

Part No. 80-1100-3 7-27

HARVEST PRESSURE REGULATING

(H.P.R.) SYSTEM

Remotes Only

GENERAL

The harvest pressure regulating (H.P.R.) system

includes:

• Harvest pressure regulating solenoid valve (H.P.R.

solenoid). This is an electrically operated valve which

opens when energized, and closes when de-

energized.

Figure 7-12. H.P.R. Solenoid

• Harvest pressure regulating valve (H.P.R. valve).

This is a non-adjustable pressure regulating valve

which modulates open and closed, based on the

refrigerant pressure at the outlet of the valve. The

valve closes completely and stops refrigerant flow

when the pressure at the outlet rises above the valve

setting.

Figure 7-13. H.P.R. Valve

SV1427

INLET OUTLET

FLOW

SV3053

OUTLET

INLET

Refrigeration System Section 7

7-28 Part No. 80-1100-3

FREEZE CYCLE

The H.P.R. system is not used during the freeze cycle.

The H.P.R. solenoid is closed (de-energized), preventing

refrigerant flow into the H.P.R. valve.

HARVEST CYCLE

During the harvest cycle, the check valve in the

discharge line prevents refrigerant in the remote

condenser and receiver from backfeeding into the

evaporator and condensing to liquid.

The H.P.R. solenoid is opened (energized) during the

harvest cycle, allowing refrigerant gas from the top of the

receiver to flow into the H.P.R. valve. The H.P.R. valve

modulates open and closed, raising the suction pressure

high enough to sustain heat for the harvest cycle,

without allowing refrigerant to condense to liquid in the

evaporator.

In general, harvest cycle suction pressure rises, then

stabilizes in the range of 75-100 psig (517-758 kPA).

Exact pressures vary from model to model. These can

be found in the “Operational Refrigerant Pressures”

charts, beginning on Page 7-32.

Section 7 Refrigeration System

Part No. 80-1100-3 7-29

HPR DIAGNOSTICS

Steps 1 through 4 can be quickly verified without

attaching a manifold gauge set or thermometer.

All questions must have a yes answer to continue

the diagnostic procedure.

1. Liquid line warm?

(Body temperature is normal)

If liquid line is warmer or cooler than body

temperature, refer to headmaster diagnostics.

2. Ice fill pattern normal?

Refer to “Ice Formation Pattern” if ice fill is not

normal.

3. Freeze time normal?

(Refer to Cycle Times/Refrigerant Pressures/24

Hour Ice Production Charts)

Shorter freeze cycles - Refer to headmaster

diagnostics.

Longer freeze cycles - Refer to water system

checklist, then refer to Refrigeration Diagnostic

Procedures.

4. Harvest time is longer than normal and control board

indicates safety limit #2?

(Refer to Cycle Times/Refrigerant Pressures/24

Hour Ice Production Charts)

Connect refrigeration manifold gauge set to the

access valves on the front of the ice machine, and a

thermometer thermocouple on the discharge line

within 6" of the compressor (insulate thermocouple).

5. Establish baseline by recording suction and

discharge pressure, discharge line temperature and

freeze & harvest cycle times. (Refer to section 7

“Operational Analysis” for data collection detail).

6. Freeze cycle Head Pressure 220 psig or higher?

If the head pressure is lower than 220 psig refer to

headmaster diagnostics.

7. Freeze cycle Suction Pressure normal?

Refer to analyzing suction pressure if suction

pressure is high or low.

8. Discharge line temperature is 160°F (71.1°C) or

higher at end of freeze cycle?

If less than 160°F (71.1°C) check expansion valve

bulb mounting and insulation.

9. Harvest cycle suction and discharge pressures are

lower than indicated in the cycle times/refrigerant

pressures/24 hour ice production chart?

Replace Harvest Pressure Regulating system (HPR

Valve and HPR solenoid valve).

Refrigeration System Section 7

7-30 Part No. 80-1100-3

HEADMASTER CONTROL VALVE

Manitowoc remote systems require headmaster control

valves with special settings. Replace defective

headmaster control valves only with “original” Manitowoc

replacement parts.

Operation

The R404A headmaster control valve is non adjustable.

At ambient temperatures of approximately 70°F (21.1°C)

or above, refrigerant flows through the valve from the

condenser to the receiver inlet. At temperatures below

this (or at higher temperatures if it is raining), the head

pressure control dome’s nitrogen charge closes the

condenser port and opens the bypass port from the

compressor discharge line.

In this modulating mode, the valve maintains minimum

head pressure by building up liquid in the condenser and

bypassing discharge gas directly to the receiver.

Diagnosing

1. Determine the air temperature entering the remote

condenser.

2. Determine if the head pressure is high or low in

relationship to the outside temperature. (Refer to the

proper “Operational Pressure Chart” later in this

section.) If the air temperature is below 70°F

(21.1°C), the head pressure should be modulating

about 225 PSIG.

3. Determine the temperature of the liquid line entering

the receiver by feeling it. This line is normally warm;

“body temperature.”

4. Using the information gathered, refer to the chart

below.

NOTE: A headmaster that will not bypass, will function

properly with condenser air temperatures of

approximately 70°F (21.1°C) or above. When the

temperature drops below 70°F (21.1°C), the headmaster

fails to bypass and the ice machine malfunctions. Lower

ambient conditions can be simulated by rinsing the

condenser with cool water during the freeze cycle.

Symptom Probable Cause Corrective Measure

Valve not maintaining pressures Non-approved valve Install a Manitowoc Headmaster control

valve with proper setting

Discharge pressure extremely high;

Liquid line entering receiver feels hot Valve stuck in bypass Replace valve

Discharge pressure low; Liquid line

entering receiver feels extremely cold Valve not bypassing Replace valve

Discharge pressure low; Liquid line

entering receiver feels warm to hot Ice machine low on charge See “Low on Charge Verification” on

Page 7-31

Section 7 Refrigeration System

Part No. 80-1100-3 7-31

LOW ON CHARGE VERIFICATION

The remote ice machine requires more refrigerant

charge at lower ambient temperatures than at higher

temperatures. A low on charge ice machine may

function properly during the day, and then malfunction at

night. Check this possibility.

If you cannot verify that the ice machine is low on

charge:

1. Add refrigerant in 2 lb. increments, but do not

exceed 6 lbs.

2. If the ice machine was low on charge, the

headmaster function and discharge pressure will

return to normal after the charge is added. Do not let

the ice machine continue to run. To assure operation

in all ambient conditions, the refrigerant leak must

be found and repaired, the liquid line drier must be

changed, and the ice machine must be evacuated

and properly recharged.

3. If the ice machine does not start to operate properly

after adding charge, replace the headmaster.

FAN CYCLE CONTROL VS. HEADMASTER

A fan cycle control cannot be used in place of a

headmaster. The fan cycle control is not capable of

bypassing the condenser coil and keeping the liquid line

temperature and pressure up.

This is very apparent when it rains or the outside

temperature drops. When it rains or the outside

temperature drops, the fan begins to cycle on and off. At

first, everything appears normal. But, as it continues

raining or getting colder, the fan cycle control can only

turn the fan off. All the refrigerant must continue to flow

through the condenser coil, being cooled by the rain or

low outside temperature.

This causes excessive sub-cooling of the refrigerant. As

a result, the liquid line temperature and pressure are not

maintained for proper operation.

Refrigeration System Section 7

7-32 Part No. 80-1100-3

Pressure Control Specifications and

Diagnostics

FAN CYCLE CONTROL

(Self-Contained Air-Cooled Models Only)

Function

Cycles the fan motor on and off to maintain proper

operating discharge pressure.

The fan cycle control closes on an increase, and opens

on a decrease in discharge pressure.

Specifications

Check Procedure

1. Verify fan motor windings are not open or grounded,

and fan spins freely.

2. Connect manifold gauges to ice machine.

3. Hook voltmeter in parallel across the fan cycle

control, leaving wires attached.

4. Refer to chart below.

HIGH PRESSURE CUT-OUT (HPCO) CONTROL

Function

Stops the ice machine if subjected to excessive high-

side pressure.

The HPCO control is normally closed, and opens on a

rise in discharge pressure.

Specifications

Cut-out: 450 psig ±10

Cut-in: Manual or automatic reset

(Must be below 300 psig to reset).

Check Procedure

1. Set ICE/OFF/CLEAN switch to OFF, (Manual reset

HPCO reset if tripped).

2. Connect manifold gauges.

3. Hook voltmeter in parallel across the HPCO, leaving

wires attached.

4. On water-cooled models, close the water service

valve to the water condenser inlet. On self-contained

air-cooled and remote models, disconnect the fan

motor.

5. Set ICE/OFF/CLEAN switch to ICE.

6. No water or air flowing through the condenser will

cause the HPCO control to open because of

excessive pressure. Watch the pressure gauge and

record the cut-out pressure.

Replace the HPCO control if it:

• Will not reset (below 300 psig)

• Does not open at the specified cut-out point

Model Cut-In (Close) Cut-Out (Open)

Q200/Q280

Q320/Q370/Q420

Q450/Q600 250 psig ±5 200 psig ±5

Q800/Q1000

Q1300/ Q1800 275 psig ±5 225 psig ±5

At: Reading Should Be: Fan Should Be:

above cut-in 0 volts running

below cut-out line voltage off

Warning

If discharge pressure exceeds 460 psig and the

HPCO control does not cut out, set ICE/OFF/

CLEAN switch to OFF to stop ice machine

operation.

Section 7 Refrigeration System

Part No. 80-1100-3 7-33

Cycle Time/24 Hour Ice Production/

Refrigerant Pressure Charts

Q200 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q200 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 11.5-13.5 13.8-16.1 15.2-17.8

1.0-2.5

80/26.7 13.8-16.1 15.6-18.2 17.0-19.8

90/32.2 16.1-18.7 18.6-21.6 20.5-23.8

100/37.8 19.8-23.0 23.6-27.4 25.5-29.6

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 270 230 210

80/26.7 230 205 190

90/32.2 200 175 160

100/37.8 165 140 130

Based on average ice slab weight of 2.44 - 2.81 lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 195-260 60-28 120-190 85-110

70/21.1 195-260 60-28 120-190 85-110

80/26.7 210-270 65-28 160-190 90-110

90/32.2 240-290 70-30 190-210 100-120

100/37.8 270-330 70-35 220-240 120-140

110/43.3 310-390 85-40 250-270 120-150

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 11.5-13.5 12.8-15.0 14.5-16.9

1-2.5

80/26.7 12.0-14.1 13.5-15.7 15.2-17.8

90/32.2 12.6-14.7 14.1-16.5 16.1-18.7

100/37.8 13.1-15.4 14.8-17.3 17.0-19.8

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 270 245 220

80/26.7 260 235 210

90/32.2 250 225 200

100/37.8 240 215 190

Based on average ice slab weight of 2.44 - 2.81 lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 240 480 2100

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 225-235 60-28 170-200 90-110

70/21.1 225-235 60-28 170-200 90-110

80/26.7 225-240 60-28 175-205 90-110

90/32.2 225-245 65-30 175-205 90-115

100/37.8 225-250 70-32 180-210 90-115

110/43.3 225-260 75-34 185-215 90-120

Suction pressure drops gradually throughout the freeze cycle

Refrigeration System Section 7

7-34 Part No. 80-1100-3

Q280 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q280 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 10.6-12.5 11.8-13.8 12.6-14.7

1.0-2.5

80/26.7 11.5-13.5 12.8-15.0 13.8-16.1

90/32.2 12.6-14.7 14.1-16.5 15.2-17.8

100/37.8 14.5-16.9 16.5-19.3 18.0-21.0

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 290 265 250

80/26.7 270 245 230

90/32.2 250 225 210

100/37.8 220 195 180

Based on average ice slab weight of 2.44 - 2.81 lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 195-250 60-20 150-190 70-90

70/21.1 195-250 60-20 150-190 70-90

80/26.7 220-280 60-26 180-220 70-90

90/32.2 250-310 66-30 190-220 80-100

100/37.8 280-350 70-32 220-250 80-110

110/43.3 310-390 85-40 250-270 80-120

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 10.6-12.5 12.0-14.1 12.3-14.4

1-2.5

80/26.7 10.8-12.7 12.3-14.4 13.8-16.1

90/32.2 11.0-13.0 12.6-14.7 14.1-16.5

100/37.8 11.3-13.2 12.8-15.0 14.5-16.9

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 290 260 255

80/26.7 285 255 230

90/32.2 280 250 225

100/37.8 275 245 220

Based on average ice slab weight of 2.44 - 2.81 lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 250 490 3400

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around

Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 225-235 60-28 190-200 75-90

70/21.1 225-235 60-28 190-200 80-90

80/26.7 225-240 60-28 190-200 80-90

90/32.2 225-245 62-28 190-200 80-90

100/37.8 225-250 62-30 190-200 80-90

110/43.3 225-260 64-32 195-205 80-95

Suction pressure drops gradually throughout the freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-35

Q320 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q320 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 12.2-13.9 13.1-14.9 14.2-16.2

1-2.5

80/26.7 13.6-15.5 14.8-16.8- 16.1-18.4

90/32.2 16.1-18.4 17.7-20.2 19.7-22.3

100/37.8 19.7-22.3 22.0-25.0 25.0-28.3

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 310 290 270

80/26.7 280 260 240

90/32.2 240 220 200

100/37.8 200 180 160

Based on average ice slab weight of 2.94 - 3.31lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 200-250 50-36 150-180 75-90

70/21.1 200-250 50-36 160-190 80-100

80/26.7 220-280 50-36 170-200 90-110

90/32.2 230-320 54-38 180-220 90-120

100/37.8 270-360 56-40 200-250 95-140

110/43.3 280-380 58-42 210-260 95-150

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 12.6-14.4 13.6-15.5 15.4-17.6

1-2.5

80/26.7 13.1-14.9 14.2-16.2 16.1-18.4

90/32.2 13.6-15.5 14.8-16.8 16.9-19.2

100/37.8 14.2-16.2 15.4-17.6 17.7-20.2

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 300 280 250

80/26.7 290 270 240

90/32.2 280 260 230

100/37.8 270 250 220

Based on average ice slab weight of 2.94 - 3.31 lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 270 560 3200

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 225-235 50-36 160-180 80-110

70/21.1 225-235 50-36 170-190 85-115

80/26.7 225-240 50-36 170-200 85-115

90/32.2 225-250 50-36 170-210 90-120

100/37.8 225-260 52-36 170-210 90-120

110/43.3 225-265 54-36 175-215 95-125

Suction pressure drops gradually throughout the freeze cycle

Refrigeration System Section 7

7-36 Part No. 80-1100-3

Q370 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q370 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 10.3-11.7 11.7-13.4 12.6-14.4

1-2.5

80/26.7 11.3-12.9 12.6-14.4 13.9-15.8

90/32.2 12.9-14.7 13.9-15.8 15.4-17.6

100/37.8 14.5-16.5 16.1-18.4 17.3-19.7

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 360 320 300

80/26.7 330 300 275

90/32.2 295 275 250

100/37.8 265 240 225

Based on average ice slab weight of 2.94 - 3.31lb

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 200-250 60-34 145-165 75-95

70/21.1 215-250 60-36 150-170 85-100

80/26.7 250-290 65-38 165-185 90-110

90/32.2 260-330 70-40 175-195 100-120

100/37.8 300-380 80-41 195-220 130-150

110/43.3 310-390 80-42 200-225 135-155

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 10.3-11.7 11.0-12.5 12.2-13.9

1-2.5

80/26.7 10.6-12.1 11.3-12.9 12.6-14.4

90/32.2 11.0-12.5 11.7-13.4 13.1-14.4

100/37.8 11.3-12.9 12.2-13.9 13.6-15.5

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 360 340 310

80/26.7 350 330 300

90/32.2 340 320 290

100/37.8 330 310 280

Based on average ice slab weight of 2.94 - 3.31lb

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 220 490 3700

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 225-235 60-32 150-170 85-100

70/21.1 225-235 60-33 150-170 85-105

80/26.7 225-240 65-36 155-175 90-110

90/32.2 225-240 68-38 155-175 90-110

100/37.8 235-260 75-40 175-200 100-120

110/43.3 240-265 85-40 185-205 105-125

Suction pressure drops gradually throughout the freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-37

Q420/450 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q420/450 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 9.7-11.4 10.9-12.8 12.0-14.0

1-2.5

80/26.7 10.9-12.8 12.3-14.4 13.3-15.6

90/32.2 12.3-14.4 14.1-16.5 15.5-18.0

100/37.8 14.5-17.0 16.5-19.2 18.3-21.3

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 530 480 440

80/26.7 480 430 400

90/32.2 430 380 350

100/37.8 370 330 300

Based on average ice slab weight of 4.12 - 4.75lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 195-260 45-30 150-170 75-90

70/21.1 200-260 47-33 165-180 80-100

80/26.7 230-265 50-35 165-185 80-100

90/32.2 260-290 55-36 190-210 90-110

100/37.8 290-340 60-38 215-235 105-125

110/43.3 195-260 45-30 235-255 125-140

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 9.9-11.7 11.4-13.4 12.6-14.8

1-2.5

80/26.7 10.1-11.9 11.7-13.7 13.0-15.2

90/32.2 10.4-12.2 12.0-14.0 13.3-15.6

100/37.8 10.6-12.5 12.3-14.4 13.7-16.0

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 520 460 420

80/26.7 510 450 410

90/32.2 500 440 400

100/37.8 490 430 390

Based on average ice slab weight of 4.12 - 4.75 lb.

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 400 740 2400

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 235-245 50-35 165-180 85-100

70/21.1 235-245 50-35 165-180 85-100

80/26.7 235-245 50-35 165-180 85-100

90/32.2 235-245 52-35 165-180 85-100

100/37.8 235-245 52-35 165-185 85-100

110/43.3 240-250 55-36 165-185 85-100

Suction pressure drops gradually throughout the freeze cycle

Refrigeration System Section 7

7-38 Part No. 80-1100-3

Q450 SERIES

Remote

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q600 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 10.6-12.5 12.0-14.0 13.3-15.6

1-2.5

80/26.7 10.9-12.8 12.3-14.4 13.7-16.0

90/32.2 11.1-13.1 12.6-14.8 14.1-16.5

100/37.8 12.0-14.0 13.7-16.0 15.5-18.0

110/43.3 13.3-15.6 15.5-18.0 17.6-20.6

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 490 440 400

80/26.7 480 430 390

90/32.2 470 420 380

100/37.8 440 390 350

110/43.3 400 350 310

Based on average ice slab weight of 4.12- 4.75lb

Regular cube derate is 7%

Ratings with JC0495 condenser, dice or half dice cubes

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

-20/-28.9 to

50/10.0 225-245 50-32 175-190 85-100

70/21.1 230-250 50-32 175-190 85-100

80/26.7 240-260 52-32 180-195 85-100

90/32.2 245-270 54-35 185-200 85-100

100/37.8 280-310 57-37 190-205 90-105

110/43.3 290-325 64-39 190-205 95-110

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 7.1-8.4 7.8-9.2 8.6-10.1

1-2.5

80/26.7 7.8-9.2 8.6-10.1 9.5-11.2

90/32.2 8.6-10.1 9.5-11.2 10.4-12.2

100/37.8 9.5-11.2 10.6-12.5 12.0-14.0

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 690 640 590

80/26.7 640 590 540

90/32.2 590 540 500

100/37.8 540 490 440

Based on average ice slab weight of 4.12- 4.75lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 195-260 42-22 155-180 75-95

70/21.1 220-290 44-22 160-185 85-100

80/26.7 220-305 52-22 160-190 90-110

90/32.2 250-325 52-23 175-195 95-115

100/37.8 280-355 54-30 195-210 95-125

110/43.3 300-385 56-32 200-225 100-135

Suction pressure drops gradually throughout the freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-39

Q600 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q600 SERIES

Remote

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 7.4-8.7 8.2-9.7 9.5-11.2

1-2.5

80/26.7 7.5-8.9 8.4-9.9 9.7-11.4

90/32.2 7.8-9.2 8.7-10.3 9.9-11.7

100/37.8 7.9-9.4 8.9-10.5 10.1-11.9

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 670 610 540

80/26.7 660 600 530

90/32.2 640 580 520

100/37.8 630 570 510

Based on average ice slab weight of 4.12 - 4.75 lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 600 1250 6800

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 225-235 46-25 140-184 80-102

70/21.1 225-235 46-26 148-184 82-104

80/26.7 225-235 48-26 154-186 86-108

90/32.2 225-240 48-26 154-190 86-108

100/37.8 225-245 50-28 162-194 86-112

110/43.3 225-250 52-28 165-200 86-115

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 7.9-9.4 8.9-10.5 9.5-11.2

1-2.5

80/26.7 8.0-9.4 9.0-10.6 9.6-11.3

90/32.2 8.1-9.5 9.1-10.7 9.7-11.4

100/37.8 8.4-9.9 9.5-11.2 10.1-11.9

110/43.3 8.9-10.5 10.1-11.9 10.9-12.8

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 630 570 540

80/26.7 625 565 535

90/32.2 620 560 530

100/37.8 600 540 510

110/43.3 570 510 480

Based on average ice slab weight of 4.12- 4.75 lb

Regular cube derate is 7%

Ratings with JC0895 condenser, dice or half dice cubes

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

-20/-28.9 to

50/10.0 220-250 42-26 152-170 75-100

70/21.1 225-260 44-26 155-172 82-100

80/26.7 245-265 46-26 156-174 82-100

90/32.2 250-265 48-26 157-174 84-100

100/37.8 265-295 52-26 158-176 84-100

110/43.3 300-335 52-28 158-176 84-105

Suction pressure drops gradually throughout the freeze cycle

Refrigeration System Section 7

7-40 Part No. 80-1100-3

Q800 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q800 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 8.9-10.2 9.7-11.1 10.3-11.9

1-2.5

80/26.7 9.3-10.7 10.2-11.7 10.9-12.5

90/32.2 10.3-11.9 11.4-13.1 12.3-14.1

100/37.8 12.1-13.8 13.3-15.2 14.4-16.5

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 800 740 700

80/26.7 770 710 670

90/32.2 700 640 600

100/37.8 610 560 520

Based on average ice slab weight of 5.75- 6.50 lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 220-280 31-18 135-180 65-90

70/21.1 220-280 32-18 140-180 70-90

80/26.7 225-280 36-20 140-180 70-95

90/32.2 260-295 38-22 150-200 80-100

100/37.8 300-330 40-24 210-225 80-100

110/43.3 320-360 44-26 210-240 85-120

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 8.7-10.1 9.5-11.0 10.9-12.5

1-2.5

80/26.7 8.9-10.2 9.7-11.1 11.0-12.7

90/32.2 9.0-10.3 9.8-11.3 11.2-12.9

100/37.8 9.1-10.5 10.0-11.5 11.4-13.1

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 810 750 670

80/26.7 800 740 660

90/32.2 790 730 650

100/37.8 780 720 640

Based on average ice slab weight of 5.75- 6.50lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 640 1420 6000

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 225-235 33-20 160-185 65-85

70/21.1 225-235 34-20 165-185 70-85

80/26.7 225-235 34-20 165-185 70-85

90/32.2 225-235 36-22 165-185 70-85

100/37.8 225-235 36-22 165-185 70-85

110/43.3 225-240 38-24 170-190 75-90

Suction pressure drops gradually throughout the freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-41

Q800 SERIES

Remote

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q1000 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 9.5-11.0 10.6-12.2 11.6-13.4

1-2.5

80/26.7 9.7-11.1 10.8-12.4 11.9-13.6

90/32.2 9.8-11.3 11.0-12.6 12.1-13.8

100/37.8 10.6-12.2 11.9-13.6 13.2-15.1

110/43.3 11.9-13.6 13.4-15.4 14.7-16.9

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 750 685 630

80/26.7 740 675 620

90/32.2 730 665 610

100/37.8 685 620 565

110/43.3 620 555 510

Based on average ice slab weight of 5.75- 6.50lb

Regular cube derate is 7%

Ratings with JC0895 condenser, dice or half dice cubes

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

-20/-28.9 to

50/10.0 220-250 30-22 180-200 65-90

70/21.1 225-250 32-22 190-200 70-90

80/26.7 240-260 33-22 190-205 70-90

90/32.2 255-265 34-22 195-205 70-90

100/37.8 275-295 38-24 200-210 70-90

110/43.3 280-320 40-26 200-225 75-100

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 9.9-10.6 10.6-11.4 11.3-12.2

1-2.5

80/26.7 10.2-11.0 11.2-12.0 11.9-12.8

90/32.2 10.9-11.7 11.9-12.8 12.8-13.7

100/37.8 12.1-13.0 13.2-14.1 14.2-15.2

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 980 920 870

80/26.7 950 880 830

90/32.2 900 830 780

100/37.8 820 760 710

Based on average ice slab weight of 7.75 - 8.25lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 220-280 38-18 135-180 65-90

70/21.1 220-280 40-18 140-180 70-90

80/26.7 225-280 42-20 140-180 70-95

90/32.2 260-295 42-22 150-200 80-100

100/37.8 300-330 42-24 210-225 80-100

110/43.3 320-360 44-24 210-240 85-120

Suction pressure drops gradually throughout the freeze cycle

Refrigeration System Section 7

7-42 Part No. 80-1100-3

Q1000 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q1000 SERIES

Remote

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 10.0-10.7 10.6-11.4 12.1-13.0

1-2.5

80/26.7 10.1-10.9 10.8-11.6 12.3-13.2

90/32.2 10.2-11.0 10.9-11.7 12.5-14.3

100/37.8 10.4-11.1 11.0-11.8 12.6-14.4

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 970 920 820

80/26.7 960 910 810

90/32.2 950 900 800

100/37.8 940 890 790

Based on average ice slab weight of 7.75- 8.25lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 750 1500 6200

Water regulating valve set to maintain 230 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 225-235 36-18 160-185 65-85

70/21.1 225-235 38-18 165-185 70-85

80/26.7 225-235 40-18 165-185 70-85

90/32.2 225-235 40-20 165-185 70-85

100/37.8 225-235 40-20 165-185 70-85

110/43.3 225-240 42-20 170-190 75-90

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 10.5-11.3 11.3-12.2 12.1-13.0

1-2.5

80/26.7 10.7-11.5 11.5-12.3 12.3-13.2

90/32.2 10.8-11.6 11.6-12.5 12.5-13.4

100/37.8 11.5-12.3 12.5-13.4 13.4-14.3

110/43.3 12.3-13.2 13.4-14.3 14.4-15.5

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 930 870 820

80/26.7 915 860 810

90/32.2 906 850 800

100/37.8 860 800 750

110/43.3 810 750 700

Based on average ice slab weight of 7.75- 8.25lb

Regular cube derate is 7%

Ratings with JC1095 condenser, dice or half dice cubes

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

-20/-28.9 to

50/10.0 220-250 40-22 180-200 65-90

70/21.1 225-250 40-22 190-200 70-90

80/26.7 240-260 42-22 190-205 70-90

90/32.2 255-265 44-22 195-205 70-90

100/37.8 275-295 44-24 200-210 70-90

110/43.3 280-320 46-26 200-225 75-100

Suction pressure drops gradually throughout the freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-43

Q1300 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q1300 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 9.4-10.5 9.9-11.1 10.9-12.2

1-2.5

80/26.7 9.9-11.1 10.6-11.8 11.6-12.9

90/32.2 11.0-12.3 11.5-12.8 12.8-14.2

100/37.8 12.3-13.7 13.2-14.7 14.7-16.3

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 1320 1260 1160

80/26.7 1260 1190 1100

90/32.2 1150 1110 1010

100/37.8 1040 980 890

Based on average ice slab weight of 10.0- 11.0 lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 220-280 40-20 140-170 65-80

70/21.1 220-280 40-20 145-170 70-80

80/26.7 220-280 42-22 150-185 70-80

90/32.2 245-300 48-26 160-190 70-85

100/37.8 275-330 50-26 160-210 70-90

110/43.3 280-360 52-28 165-225 75-100

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 9.0-10.1 9.8-10.9 11.4-12.6

1-2.5

80/26.7 9.1-10.1 9.8-11.0 11.6-12.9

90/32.2 9.2-10.3 10.0-11.2 12.0-13.3

100/37.8 9.4-10.5 10.1-11.3 12.2-13.6

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 1370 1280 1120

80/26.7 1360 1270 1100

90/32.2 1340 1250 1070

100/37.8 1320 1240 1050

Based on average ice slab weight of 10.0 - 11.0 lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 1150 2220 7400

Water regulating valve set to maintain 240 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 235-245 40-18 150-180 70-80

70/21.1 235-245 40-18 150-180 70-80

80/26.7 235-245 40-20 150-180 70-80

90/32.2 235-250 42-20 150-180 70-80

100/37.8 235-255 44-20 150-180 70-80

110/43.3 240-265 46-20 150-180 70-80

Suction pressure drops gradually throughout the freeze cycle

Refrigeration System Section 7

7-44 Part No. 80-1100-3

Q1300 SERIES

Remote

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q1600 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 9.9-11.1 10.9-12.2 11.7-13.0

1-2.5

80/26.7 10.0-11.2 11.0-12.3 11.1-12.4

90/32.2 10.1-11.3 11.1-12.4 10.7-11.9

100/37.8 10.8-12.0 11.8-13.2 12.8-14.2

110/43.3 11.7-13.0 12.9-14.3 13.8-15.4

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 1260 1160 1090

80/26.7 1250 1150 1140

90/32.2 1240 1140 1180

100/37.8 1170 1080 1010

110/43.3 1090 1000 940

Based on average ice slab weight of 10.0- 11.0 lb

Ratings with JC1395 condenser, dice or half dice cubes

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

-20/-28.9 to

50/10.0 220-250 40-22 135-170 75-95

70/21.1 240-260 40-22 140-180 80-95

80/26.7 240-270 41-22 140-190 80-95

90/32.2 250-290 42-22 140-200 80-95

100/37.8 280-320 46-22 140-210 80-95

110/43.3 310-360 48-24 140-220 85-100

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 7.2-8.1 8.0-9.0 8.9-9.9

1-2.580/26.7 7.3-8.2 8.1-9.1 9.2-10.2

90/32.2 7.4-8.2 8.2-9.1 9.6-10.7

100/37.8 7.4-8.3 8.4-9.4 9.7-10.8

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 1650 1510 1390

80/26.7 1635 1500 1350

90/32.2 1625 1490 1300

100/37.8 1620 1450 1290

70/21.1 1650 1510 1390

Based on average ice slab weight of 13.0 -14.12 lb

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 1400 2235 6500

Water regulating valve set to maintain 240 PSIG discharge pressure

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

-20/-28.9 to

50/10.0 235-245 48-24 145-170 70-90

70/21.1 235-265 52-26 150-175 70-90

80/26.7 235-270 52-26 150-175 75-95

90/32.2 235-280 52-28 155-180 75-95

100/37.8 240-285 52-28 155-180 80-100

110/43.3 240-290 54-28 155-185 80-100

Suction pressure drops gradually throughout the freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-45

Q1600 SERIES

Remote

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q1800 SERIES

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20 to 70

-29 to 21.1 7.5-8.4 8.2-9.2 9.0-10.1

1 - 2.5

90/32.2 8.0-8.9 8.6-9.6 9.2-10.3

100/37.8 8.4-9.3 9.2-10.2 9.7-10.8

110/43.3 9.2-10.3 10.0-11.2 10.4-11.6

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20 to 70

-29 to 21.1 1600 1478 1370

90/32.2 1523 1425 1340

100/37.8 1460 1350 1290

110/43.3 1343 1250 1213

Based on average ice slab weight of 13.0- 14.12lb

Ratings with JC1895 condenser, dice or half dice cubes

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

-20 to 50/-29

to 10.0 220-255 52-26 100-120 70-85

70/21.1 250-270 56-28 110-120 75-90

80/26.7 250-275 56-28 110-120 75-90

90/32.2 255-285 56-28 110-120 80-90

100/37.8 270-310 56-30 115-130 80-95

110/43.3 305-350 58-32 120-135 80-100

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 8.5-9.3 9.4-10.3 9.9-10.9

1-2.5

80/26.7 9.0-9.9 9.8-10.8 10.5-11.5

90/32.2 9.6-10.5 10.4-11.5 11.1-12.2

100/37.8 10.6-11.6 11.5-12.6 12.4-13.6

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 1880 1720 1640

80/26.7 1780 1650 1560

90/32.2 1690 1570 1480

100/37.8 1550 1440 1350

Based on average ice slab weight of 13.0 - 14.12lb

Regular cube derate is 7%

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 220-280 40-20 155-190 60-80

70/21.1 220-280 40-20 160-190 65-80

80/26.7 230-290 42-20 160-190 65-80

90/32.2 260-320 44-22 185-205 70-90

100/37.8 300-360 46-24 210-225 75-100

110/43.3 320-400 48-26 215-240 80-100

Suction pressure drops gradually throughout the freeze cycle

Refrigeration System Section 7

7-46 Part No. 80-1100-3

Q1800 SERIES

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Q1800 SERIES

Remote

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

24 Hour Ice Production

Operating Pressures

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 8.7-9.6 9.6-10.5 10.8-11.9

1-2.5

80/26.7 9.0-9.9 9.6-10.6 10.8-11.9

90/32.2 9.1-10.1 9.7-10.7 10.9-12.0

100/37.8 9.2-10.1 9.8-10.7 11.1-12.1

Times in minutes

Air Temp.

Around Ice

Machine

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

70/21.1 1840 1690 1520

80/26.7 1780 1680 1520

90/32.2 1760 1670 1510

100/37.8 1750 1660 1490

Based on average ice slab weight of 13.0- 14.12lb

Regular cube derate is 7%

Condenser

Water

Consumption

90/32.2 Air Temperature

Around Ice Machine

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

Gal/24 hours 2000 2670 7750

Water regulating valve set to maintain 240 PSIG discharge pressure

Air Temp.

Around Ice

Machine

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

50/10.0 235-245 36-20 170-190 65-80

70/21.1 235-245 38-20 170-190 65-80

80/26.7 235-245 40-20 170-190 65-80

90/32.2 235-250 42-22 175-190 65-80

100/37.8 235-255 44-22 175-190 65-80

110/43.3 235-260 46-22 175-190 65-80

Suction pressure drops gradually throughout the freeze cycle

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

Time

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 9.1-10.0 9.8-10.8 10.7-11.7

1-2.5

80/26.7 9.3-10.2 10.1-11.1 10.9-12.0

90/32.2 9.5-10.5 10.3-11.4 11.1-12.2

100/37.8 10.1-11.1 11.1-12.2 11.9-13.0

110/43.3 11.0-12.1 12.1-13.2 12.7-13.9

Times in minutes

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10.0 70/21.1 90/32.2

-20/-28.9 to

70/21.1 1770 1650 1540

80/26.7 1735 1615 1510

90/32.2 1700 1580 1480

100/37.8 1620 1480 1400

110/43.3 1500 1380 1320

Based on average ice slab weight of 13.0 - 14.12lb

Regular cube derate is 7%

Ratings with JC1895 condenser, dice or half dice cubes

Air Temp.

Entering

Condenser

°F/°C

Freeze Cycle Harvest Cycle

Discharg

Pressure

PSIG

Suction

Pressure

PSIG

Discharge

Pressure

PSIG

Suction

Pressure

PSIG

-20/-28.9 to

50/10.0 220-250 38-24 160-180 60-80

70/21.1 220-260 40-24 170-180 60-80

80/26.7 250-270 48-24 175-190 70-90

90/32.2 250-280 50-24 180-200 80-90

100/37.8 270-300 52-28 205-215 80-95

110/43.3 300-350 54-28 205-230 80-100

Suction pressure drops gradually throughout the freeze cycle

Section 7 Refrigeration System

Part No. 80-1100-3 7-47

Refrigerant Recovery/Evacuation and Recharging

NORMAL SELF-CONTAINED MODEL PROCEDURES

Refrigerant Recovery/Evacuation

Do not purge refrigerant to the atmosphere. Capture

refrigerant using recovery equipment. Follow the

manufacturer’s recommendations.

CONNECTIONS

1. Suction side of the compressor through the suction

service valve.

2. Discharge side of the compressor through the

discharge service valve.

SELF-CONTAINED RECOVERY/EVACUATION

1. Place the toggle switch in the OFF position.

2. Install manifold gauges, charging cylinder/scale, and

recovery unit or two-stage vacuum pump.

Figure 7-14. Recovery/Evacuation Connections

3. Open (backseat) the high and low side ice machine

service valves, and open high and low side on

manifold gauges.

4. Perform recovery or evacuation:

A. Recovery: Operate the recovery unit as directed

by the manufacturer’s instructions.

B. Evacuation prior to recharging: Pull the system

down to 250 microns. Then, allow the pump to

run for an additional half hour. Turn off the pump

and perform a standing vacuum leak check.

NOTE: Check for leaks using a halide or electronic leak

detector after charging the ice machine.

5. Refer to Charging Procedures.

Important

Manitowoc Ice, Inc. assumes no responsibility for

the use of contaminated refrigerant. Damage

resulting from the use of contaminated refrigerant is

the sole responsibility of the servicing company.

Important

Replace the liquid line drier before evacuating and

recharging. Use only a Manitowoc (O.E.M.) liquid

line filter drier to prevent voiding the warranty.

MANIFOLD SET

OPEN

BACKSEATED

VACUUM PUMP/

RECOVERY UNIT

CLOSED

OPEN

LOW SIDE

SERVICE

VALVE

HIGH SIDE

SERVICE

VALVE

BACKSEATED

OPEN

SV1404A

Refrigeration System Section 7

7-48 Part No. 80-1100-3

Self-Contained Charging Procedures

1. Be sure the toggle switch is in the OFF position.

Figure 7-15. Charging Connections

2. Close the vacuum pump valve, the low side service

valve, and the low side manifold gauge valve.

3. Open the high side manifold gauge valve, and

backseat the high side service valve.

4. Open the charging cylinder and add the proper

refrigerant charge (shown on nameplate) through

the discharge service valve.

5. Let the system “settle” for 2 to 3 minutes.

6. Place the toggle switch in the ICE position.

7. Close the high side on the manifold gauge set. Add

any remaining vapor charge through the suction

service valve (if necessary).

NOTE: Manifold gauges must be removed properly to

ensure that no refrigerant contamination or loss occurs.

8. Make sure that all of the vapor in the charging hoses

is drawn into the ice machine before disconnecting

the charging hoses.

A. Run the ice machine in freeze cycle.

B. Close the high side service valve at the ice

machine.

C. Open the low side service valve at the ice

machine.

D. Open the high and low side valves on the

manifold gauge set. Any refrigerant in the lines

will be pulled into the low side of the system.

E. Allow the pressures to equalize while the ice

machine is in the freeze cycle.

F. Close the low side service valve at the ice

machine.

Remove the hoses from the ice machine and install the

caps.

Important

The charge is critical on all Manitowoc ice

machines. Use a scale or a charging cylinder to

ensure the proper charge is installed.

MANIFOLD SET

CLOSED

FRONTSEATED

CHARGING

CYLINDER VACUUM PUMP/

RECOVERY UNIT

OPEN

CLOSED

LOW SIDE

SERVICE

VALVE

HIGH SIDE

SERVICE

VALVE

BACKSEATED

OPEN

SV1404B

Section 7 Refrigeration System

Part No. 80-1100-3 7-49

NORMAL REMOTE MODEL PROCEDURES

Refrigerant Recovery/Evacuation

Do not purge refrigerant to the atmosphere. Capture

refrigerant using recovery equipment. Follow the

manufacturer’s recommendations.

CONNECTIONS

Make these connections:

• Suction side of the compressor through the suction

service valve.

• Discharge side of the compressor through the

discharge service valve.

• Receiver outlet service valve, which evacuates the

area between the check valve in the liquid line and

the pump down solenoid.

• Access (Schrader) valve on the discharge line quick-

connect fitting, located on the outside of the

compressor/evaporator compartment. This

connection evacuates the condenser. Without it, the

magnetic check valves would close when the

pressure drops during evacuation, preventing

complete evacuation of the condenser.

NOTE: Manitowoc recommends using an access valve

core removal and installation tool on the discharge line

quick-connect fitting. This permits access valve core

removal. This allows for faster evacuation and charging,

without removing the manifold gauge hose.

REMOTE RECOVERY/EVACUATION

1. Place the toggle switch in the OFF position.

2. Install manifold gauges, charging cylinder/scale, and

recovery unit or two-stage vacuum pump.

3. Open (backseat) the high and low side ice machine

service valves.

4. Open the receiver service valve halfway.

5. Open high and low side on the manifold gauge set.

6. Perform recovery or evacuation:

A. Recovery: Operate the recovery unit as directed

by the manufacturer’s instructions.

B. Evacuation prior to recharging: Pull the system

down to 250 microns. Then, allow the pump to

run for an additional hour. Turn off the pump and

perform a standing vacuum leak check.

NOTE: Check for leaks using a halide or electronic leak

detector after charging the ice machine.

7. Refer to Charging Procedures.

Important

Manitowoc Ice, Inc. assumes no responsibility for

the use of contaminated refrigerant. Damage

resulting from the use of contaminated refrigerant is

the sole responsibility of the servicing company.

Important

Replace the liquid line drier before evacuating and

recharging. Use only a Manitowoc (O.E.M.) liquid

line filter drier to prevent voiding the warranty.

Important

Recovery/evacuation of a remote system requires

connections at four points for complete system

evacuation. See the drawing on next page.

Refrigeration System Section 7

7-50 Part No. 80-1100-3

Figure 7-16. Recovery/Evacuation Connections

SCHRAEDER FITTING

QU ICK CO NNECT

DISCHARGE LINE

CO NTR O L VALVE

HEAD PRESSU RE

RE M O TE CO NDENSER

CLO SED

SCA LE

OPEN

REC O V ER Y UNIT

VACUUM PUM P/

SER VICE VALVE

1/2 OPEN

RECEI VER

M ANIFO LD SET

OPEN

DRIER

SO LEN O ID

LINE

VALVE

REG ULATING

PRESSU RE

HAR VEST

LIQU ID

(BAC K SEATED )

SER VICE VALVE

CHEC K VALVE

TEE

OPEN

HIGH SIDE

(BAC K SEATED )

SER VICE VALVE

LO W SIDE

CO M PRESSO R

HAR VEST

PRESSURE

SO LEN O ID

VALVE

EX PANSIO N

VALVE

CHEC K

STRAINER

VALVES

SO LEN O ID

H O T GAS

HEAT E XCHANGER EV APO RAT O R

SV1461

Section 7 Refrigeration System

Part No. 80-1100-3 7-51

Remote Charging Procedures

1. Be sure the toggle switch is in the OFF position.

2. Close the vacuum pump valve, the low and high side

service valves (frontseat), and the low side manifold

gauge valve.

3. Open the charging cylinder and add the proper

refrigerant charge (shown on nameplate) into the

system high side (receiver outlet valve and

discharge lines quick-connect fitting).

4. If the high side does not take the entire charge,

close the high side on the manifold gauge set, and

backseat (open) the low side service valve and

receiver outlet service valve. Start the ice machine

and add the remaining charge through the low side

(in vapor form) until the machine is fully charged.

5. Ensure all vapor in charging hoses is drawn into the

machine, then disconnect the manifold gauges.

NOTE: Backseat the receiver outlet service valve after

charging is complete and before operating the ice

machine. If the access valve core removal and

installation tool is used on the discharge quick-connect

fitting, reinstall the Schraeder valve core before

disconnecting the access tool and hose.

6. Run the ice machine in freeze cycle.

7. Close the high side service valve at the ice machine.

8. Open the low side service valve at the ice machine.

9. Open the high and low side valves on the manifold

gauge set. Any refrigerant in the lines will be pulled

into the low side of the system.

10. Allow the pressures to equalize while the ice

machine is in the freeze cycle.

11. Close the low side service valve at the ice machine.

12. Remove the hoses from the ice machine and install

the caps.

Refrigeration System Section 7

7-52 Part No. 80-1100-3

SCHRAEDER FITTING

QU ICK CO NNECT

DISCHARGE LINE

CO NTR O L VALVE

HEAD PRESSURE

RE M O TE CO NDENSER

CLO SED

SCA LE REC O VER Y U NIT

VACUUM PU M P/

SER VICE VALVE

1/2 OPEN

RECEI V ER

M ANIFO LD SET

OPEN

DRIER

SO LEN O ID

LINE

VALVE

REG ULATING

PRESSURE

HAR VEST

LIQU ID

(BAC K SEATED )

SER VICE VALVE

CHEC K VALVE

TEE

OPEN

HIGH SIDE

(BAC K SEATED )

SER VICE VALVE

LO W SIDE

CO M PRESSO R

HAR VEST

PRESSU RE

SO LEN O ID

VALVE

EX PANSIO N

VALVE

CHEC K

STRAINER

VALVES

SO LEN O ID

H O T GAS

HEAT E X CHANGER EVAPO RAT O R

SV1462

Figure 7-17. Remote Charging Connections

Section 7 Refrigeration System

Part No. 80-1100-3 7-53

SYSTEM CONTAMINATION CLEAN-UP

General

This section describes the basic requirements for

restoring contaminated systems to reliable service.

Determining Severity Of Contamination

System contamination is generally caused by either

moisture or residue from compressor burnout entering

the refrigeration system.

Inspection of the refrigerant usually provides the first

indication of system contamination. Obvious moisture or

an acrid odor in the refrigerant indicates contamination.

If either condition is found, or if contamination is

suspected, use a Total Test Kit from Totaline or a similar

diagnostic tool. These devices sample refrigerant,

eliminating the need to take an oil sample. Follow the

manufacturer’s directions.

If a refrigerant test kit indicates harmful levels of

contamination, or if a test kit is not available, inspect the

compressor oil.

1. Remove the refrigerant charge from the ice

machine.

2. Remove the compressor from the system.

3. Check the odor and appearance of the oil.

4. Inspect open suction and discharge lines at the

compressor for burnout deposits.

5. If no signs of contamination are present, perform an

acid oil test.

Check the chart below to determine the type of cleanup

required.

Important

Manitowoc Ice, Inc. assumes no responsibility for

the use of contaminated refrigerant. Damage

resulting from the use of contaminated refrigerant is

the sole responsibility of the servicing company.

Contamination/Cleanup Chart

Symptoms/Findings Required Cleanup Procedure

No symptoms or suspicion of contamination Normal evacuation/recharging procedure

Moisture/Air Contamination symptoms

Refrigeration system open to atmosphere for longer than 15

minutes

Refrigeration test kit and/or acid oil test shows contamination

Leak in water-cooled condenser

No burnout deposits in open compressor lines

Mild contamination cleanup procedure

Mild Compressor Burnout symptoms

Oil appears clean but smells acrid

Refrigeration test kit or acid oil test shows harmful acid content

No burnout deposits in open compressor lines

Mild contamination cleanup procedure

Severe Compressor Burnout symptoms

Oil is discolored, acidic, and smells acrid

Burnout deposits found in the compressor and lines, and in

other components

Severe contamination cleanup procedure

Refrigeration System Section 7

7-54 Part No. 80-1100-3

Mild System Contamination Cleanup Procedure

1. Replace any failed components.

2. If the compressor is good, change the oil.

3. Replace the liquid line drier.

NOTE: If the contamination is from moisture, use heat

lamps during evacuation. Position them at the

compressor, condenser and evaporator prior to

evacuation. Do not position heat lamps too close to

plastic components, or they may melt or warp.

4. Follow the normal evacuation procedure, except

replace the evacuation step with the following:

A. Pull vacuum to 1000 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psi.

B. Pull vacuum to 500 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psi.

C. Change the vacuum pump oil.

D. Pull vacuum to 250 microns. Run the vacuum

pump for 1/2 hour on self-contained models, 1

hour on remotes.

NOTE: You may perform a standing vacuum test to

make a preliminary leak check. You should use an

electronic leak detector after system charging to be sure

there is no leak.

5. Charge the system with the proper refrigerant to the

nameplate charge.

6. Operate the ice machine.

Severe System Contamination Cleanup Procedure

1. Remove the refrigerant charge.

2. Remove the compressor.

3. Disassemble the harvest solenoid valve. If burnout

deposits are found inside the valve, install a rebuild

kit, and replace manifold strainer, TXV and harvest

pressure regulating valve.

4. Wipe away any burnout deposits from suction and

discharge lines at compressor.

5. Sweep through the open system with dry nitrogen.

6. Install a new compressor and new start components.

7. Install a suction line filter-drier with acid and

moisture removal capability (P/N 89-3028-3). Place

the filter drier as close to the compressor as

possible.

8. Install an access valve at the inlet of the suction line

drier.

9. Install a new liquid line drier.

Continued on next page …

Important

Dry nitrogen is recommended for this procedure.

This will prevent CFC release. Important

Refrigerant sweeps are not recommended, as they

release CFC’s into the atmosphere.

Section 7 Refrigeration System

Part No. 80-1100-3 7-55

10. Follow the normal evacuation procedure, except

replace the evacuation step with the following:

A. Pull vacuum to 1000 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psi.

B. Change the vacuum pump oil.

C. Pull vacuum to 500 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psi.

D. Change the vacuum pump oil.

E. Pull vacuum to 250 microns. Run the vacuum

pump for 1/2 hour on self-contained models, 1

hour on remotes.

NOTE: You may perform a standing vacuum test to

make a preliminary leak check. You should use an

electronic leak detector after system charging to be sure

there is no leak.

11. Charge the system with the proper refrigerant to the

nameplate charge.

12. Operate the ice machine for one hour. Then, check

the pressure drop across the suction line filter-drier.

A. If the pressure drop is less than 1 psi, the filter-

drier should be adequate for complete cleanup.

B. If the pressure drop exceeds 1 psi, change the

suction line filter-drier and the liquid line drier.

Repeat until the pressure drop is acceptable.

13. Operate the ice machine for 48-72 hours. Then,

remove the suction line drier and change the liquid

line drier.

14. Follow normal evacuation procedures.

REPLACING PRESSURE CONTROLS WITHOUT

REMOVING REFRIGERANT CHARGE

This procedure reduces repair time and cost. Use it

when any of the following components require

replacement, and the refrigeration system is operational

and leak-free.

• Fan cycle control (air-cooled only)

• Water regulating valve (water-cooled only)

• High pressure cut-out control

• High side service valve

• Low side service valve

1. Disconnect power to the ice machine.

2. Follow all manufacturer’s instructions supplied with

the pinch-off tool. Position the pinch-off tool around

the tubing as far from the pressure control as

feasible. (See the figure on next page.) Clamp down

on the tubing until the pinch-off is complete.

3. Cut the tubing of the defective component with a

small tubing cutter.

4. Solder the replacement component in place. Allow

the solder joint to cool.

5. Remove the pinch-off tool.

6. Re-round the tubing. Position the flattened tubing in

the proper hole in the pinch off tool. Tighten the

wingnuts until the block is tight and the tubing is

rounded. (See the drawing on next page.)

NOTE: The pressure controls will operate normally once

the tubing is re-rounded. Tubing may not re-round

100%.

Important

Dry nitrogen is recommended for this procedure.

This will prevent CFC release.

Important

This is a required in-warranty repair procedure.

Warning

Do not unsolder a defective component. Cut it out of

the system. Do not remove the pinch-off tool until

the new component is securely in place.

Refrigeration System Section 7

7-56 Part No. 80-1100-3

Figure 7-18. Using Pinch-Off Tool

SV1406

Section 7 Refrigeration System

Part No. 80-1100-3 7-57

FILTER-DRIERS

The filter-driers used on Manitowoc ice machines are

manufactured to Manitowoc specifications.

The difference between Manitowoc driers and off-the-

shelf driers is in filtration. Manitowoc driers have dirt-

retaining filtration, with fiberglass filters on both the inlet

and outlet ends. This is very important because ice

machines have a back-flushing action which takes place

during every harvest cycle.

These filter-driers have a very high moisture removal

capability and a good acid removal capability.

The size of the filter-drier is important. The refrigerant

charge is critical. Using an improperly sized filter-drier

will cause the ice machine to be improperly charged with

refrigerant.

Listed below are the recommended O.E.M. field

replacement driers:

TOTAL SYSTEM REFRIGERANT CHARGES

NOTE: All ice machines on this list are charged using

R-404A refrigerant.

Model Drier

Size

End

Connection

Size

Part

Number

Self-Contained Air

and Water Cooled

Q200 /Q280/Q320

Q370/Q420/Q450

Q600/Q800/Q1000

UK-032S 1/4" 89-3025-3

Remote Air Cooled

Q450/Q600

Q800/Q1000 UK-083S 3/8" 89-3027-3

All Condenser

Type

Q1300/Q1600

Q1800

UK-083S 3/8" 89-3027-3

Suction Filter UK-165S 5/8" 89-3028-3

Suction Filter used when cleaning up severely contaminated systems

Important

Driers are covered as a warranty part. The drier

must be replaced any time the system is opened for

repairs.

Important

This information is for reference only. Refer to the

ice machine serial number tag to verify the system

charge. Serial plate information overrides

information listed on this page.

Series Version Charge

Q200 Air-Cooled 18 oz.

Water-Cooled 15 oz.

Q210 Air-Cooled 15 oz

Water-Cooled 11 oz

Q280 Air-Cooled 18 oz

Water-Cooled 15 oz

Q320 Air-Cooled 20 oz.

Water-Cooled 16 oz.

Q370 Air-Cooled 20 oz.

Water-Cooled 17 oz.

Q420/Q450

Air-Cooled 24 oz.

Water-Cooled 22 oz.

Remote 6 lb.

Q600

Air-Cooled 28 oz.

Water-Cooled 22 oz.

Remote 8 lb.

Q800

Air-Cooled 36 oz.

Water-Cooled 25 oz.

Remote 8 lb.

Q1000

Air-Cooled 38 oz.

Water-Cooled 32 oz.

Remote 9.5 lb.

Q1300

Air-Cooled 48 oz.

Water-Cooled 44 oz.

Remote 12.5 lb. *

*For remote line sets with lengths between 50' and 100' refer to

chart on Page 2-13

Q1600 Water-Cooled 46 oz.

Remote 15 lb.*

Q1800

Air-Cooled 56 oz.

Water-Cooled 46 oz.

Remote 15 lb.*

Refrigeration System Section 7

7-58 Part No. 80-1100-3

REFRIGERANT DEFINITIONS

Recover

To remove refrigerant, in any condition, from a system

and store it in an external container, without necessarily

testing or processing it in any way.

Recycle

To clean refrigerant for re-use by oil separation and

single or multiple passes through devices, such as

replaceable core filter-driers, which reduce moisture,

acidity and particulate matter. This term usually applies

to procedures implemented at the field job site or at a

local service shop.

Reclaim

To reprocess refrigerant to new product specifications

(see below) by means which may include distillation. A

chemical analysis of the refrigerant is required after

processing to be sure that product specifications are

met. This term usually implies the use of processes and

procedures available only at a reprocessing or

manufacturing facility.

Chemical analysis is the key requirement in this

definition. Regardless of the purity levels reached by a

reprocessing method, refrigerant is not considered

“reclaimed” unless it has been chemically analyzed and

meets ARI Standard 700 (latest edition).

New Product Specifications

This means ARI Standard 700 (latest edition). Chemical

analysis is required to assure that this standard is met.

Section 7 Refrigeration System

Part No. 80-1100-3 7-59

REFRIGERANT RE-USE POLICY

Manitowoc recognizes and supports the need for proper

handling, re-use, and disposal of, CFC and HCFC

refrigerants. Manitowoc service procedures require

recapturing refrigerants, not venting them to the

atmosphere.

It is not necessary, in or out of warranty, to reduce or

compromise the quality and reliability of your customers’

products to achieve this.

Manitowoc approves the use of:

1. New Refrigerant

• Must be of original nameplate type.

2. Reclaimed Refrigerant

• Must be of original nameplate type.

• Must meet ARI Standard 700 (latest edition)

specifications.

3. Recovered or Recycled Refrigerant

• Must be recovered or recycled in accordance

with current local, state and federal laws.

• Must be recovered from and re-used in the same

Manitowoc product. Re-use of recovered or

recycled refrigerant from other products is not

approved.

• Recycling equipment must be certified to ARI

Standard 740 (latest edition) and be maintained

to consistently meet this standard.

• Recovered refrigerant must come from a

“contaminant-free” system. To decide whether

the system is contaminant free, consider:

– Type(s) of previous failure(s)

– Whether the system was cleaned, evacuated

and recharged properly following failure(s)

– Whether the system has been contaminated

by this failure

– Compressor motor burnouts and improper

past service prevent refrigerant re-use.

– Refer to “System Contamination Cleanup” to

test for contamination.

4. “Substitute” or “Alternative” Refrigerant

• Must use only Manitowoc-approved alternative

refrigerants.

• Must follow Manitowoc-published conversion

procedures.

Important

Manitowoc Ice, Inc. assumes no responsibility for

use of contaminated refrigerant. Damage resulting

from the use of contaminated, recovered, or

recycled refrigerant is the sole responsibility of the

servicing company.

Refrigeration System Section 7

7-60 Part No. 80-1100-3

HFC REFRIGERANT QUESTIONS AND ANSWERS

Manitowoc uses R-404A and R-134A HFC refrigerants

with ozone depletion potential (ODP) factors of zero

(0.0). R-404A is used in ice machines and reach-in

freezers and R-134A is used in reach-in refrigerators.

1. What compressor oil does Manitowoc require for

use with HFC refrigerants?

Manitowoc products use Polyol Ester (POE) type

compressor oil. It is the lubricant of choice among

compressor manufacturers.

2. What are some of the characteristics of POE oils?

They are hygroscopic, which means they have the

ability to absorb moisture. POE oils are 100 times

more hygroscopic than mineral oils. Once moisture

is absorbed into the oil, it is difficult to remove, even

with heat and vacuum. POE oils are also excellent

solvents, and tend to “solvent clean” everything

inside the system, depositing material where it is not

wanted.

3. What do these POE oil characteristics mean to me?

You must be more exacting in your procedures. Take

utmost care to prevent moisture from entering the

refrigeration system. Refrigeration systems and

compressors should not be left open to the

atmosphere for more than 15 minutes. Keep oil

containers and compressors capped at all times to

minimize moisture entry. Before removing the

system charge to replace a faulty component, be

sure you have all of the needed components at the

site. Remove new system component plugs and

caps just prior to brazing. Be prepared to connect a

vacuum pump immediately after brazing.

4. Are there any special procedures required if a POE

system is diagnosed with a refrigerant leak?

For systems found with positive refrigerant system

pressure, no special procedures are required.

For systems found without any positive refrigerant

pressure, assume that moisture has entered the

POE oil. After the leak is found and repaired, the

compressor oil must be changed. The compressor

must be removed and at least 95% of the oil drained

from the suction port of the compressor. Use a

“measuring cup” to replace the old oil with exactly

the same amount of new POE oil, such as Mobil

EAL22A.

Remember, care must be taken to prevent moisture

from getting into the refrigeration system during

refrigeration repairs.

5. How do I leak-check a system containing HFC

refrigerant?

Use equipment designed for HFC detection. Do not

use equipment designed for CFC detection. Consult

leak detection equipment manufacturers for their

recommendations. Also, standard soap bubbles will

work with HFC refrigerants.

6. Does Manitowoc use a special liquid line filter-drier

with HFC refrigerants?

Yes. Manitowoc uses an ALCO “UK” series filter-

drier for increased filtration and moisture removal.

During a repair, Manitowoc recommends installing

the drier just before hooking up a vacuum pump.

Continued on next page …

Section 7 Refrigeration System

Part No. 80-1100-3 7-61

7. Is other special equipment required to service HFC

refrigerants?

No. Standard refrigeration equipment such as

gauges, hoses, recovery systems, vacuum pumps,

etc., are generally compatible with HFC refrigerants.

Consult your equipment manufacturer for specific

recommendations for converting existing equipment

to HFC usage. Once designated (and calibrated, if

needed) for HFC use, this equipment should be

used specifically with HFC refrigerants only.

8. Do I have to recover HFC refrigerants?

Yes. Like other refrigerants, government regulations

require recovering HFC refrigerants.

9. Will R-404A or R-134A separate if there is a leak in

the system?

No. Like R-502, the degree of separation is too small

to detect.

10. How do I charge a system with HFC refrigerant?

The same as R-502. Manitowoc recommends

charging only liquid refrigerant into the high side of

the system.

Refrigeration System Section 7

7-62 Part No. 80-1100-3

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Section 7 Refrigeration System

Part No. 80-1100-3 7-63

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