Manitowoc S Ice Machine 80 1480 3 Users Manual S__sm_8014803(S_Cvr)

2015-02-09

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S Model
Ice Machines

Service
Manual

Thank you for selecting a Manitowoc Ice Machine, the dependability leader in ice making equipment and related products.
With proper installation, care and maintenance, your new Manitowoc Ice Machine will provide you with many years of
reliable and economical performance.

This manual is updated as new information and models
are released. Visit our website for the latest manual.
www.manitowocice.com

Part Number 80-1480-3
01/2005

Safety Notices

Procedural Notices

As you work on a S-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.

As you work on a S-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 safety notices:

Throughout this manual, you will see the following types
of procedural notices:

! 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.

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.
NOTE: Text set off as a Note provides you with simple,
but useful, extra information about the procedure you
are performing.

Read These Before Proceeding:
! Caution

! 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.

Proper installation, care and maintenance are
essential for maximum ice production and troublefree operation of you Manitowoc Ice Machine.
Read and understand this manual. It contains
valuable care and maintenance information. If you
encounter problems not covered by this manual, do
not proceed, contact Manitowoc Ice, Inc. We will be
happy to provide assistance.

Important
Routine adjustments and maintenance procedures
outlined in this manual are not covered by the
warranty.

We reserve the right to make product improvements at any time.
Specifications and design are subject to change without notice.

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
OR
• 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
© 2004 Manitowoc Ice, Inc.

Table of Contents

Section 1
General Information
Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Read a Model Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Cube Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bin Caster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Bagger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Guardian Sachet Packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Arctic Pure Water Filter System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manitowoc Cleaner and Sanitizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AuCS® Automatic Cleaning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model/Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Owner Warranty Registration Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Labor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Authorized Warranty Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
1-1
1-1
1-2
1-2
1-2
1-2
1-2
1-2
1-2
1-2
1-3
1-4
1-4
1-4
1-4
1-4
1-4
1-4
1-4

Section 2
Installation Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Machine Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S320/S420 Air and Water-Cooled Ice Machines . . . . . . . . . . . . . . . . . . . .
S600 Air and Water-Cooled Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . .
S600 Remote Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S300/S450/S500/S850/S1000 Air and Water-Cooled Ice Machines . . . . .
S500/S850/S1000 Remote Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . .
S1400 / S1800 Air and Water-Cooled Ice Machines . . . . . . . . . . . . . . . . .
S1400 / S1800 Remote Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Storage Bin Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30 inch (76 cm) Ice Storage Bins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22 Inch (56 cm) Ice Storage Bins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48 Inch (130 cm) Ice Storage Bins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Condenser Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JC0495/JC0895/JC1395 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location of Ice Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Machine Heat of Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Drain Plug and Leveling the Ice Storage Bin . . . . . . . . . . . . . . . .
Air-Cooled Baffle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum Circuit Ampacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
For United Kingdom Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Part No. 80-1480-3

2-1
2-1
2-1
2-2
2-2
2-3
2-4
2-5
2-5
2-6
2-6
2-6
2-6
2-6
2-6
2-7
2-7
2-8
2-8
2-9
2-9
2-9
2-9
2-9
2-10
2-10
2-10
2-10
2-10

Table of Contents (continued)
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Supply and Drain Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Inlet Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drain Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Tower Applications
(Water-Cooled Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Supply and Drain Line Sizing/Connections . . . . . . . . . . . . . . . . . . . .
Remote Condenser/Line Set Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Ice Machines
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Guidelines for Routing Line Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calculating Remote Condenser Installation Distances . . . . . . . . . . . . . . . .
Lengthening or Reducing Line Set Lengths . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting A Line Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Receiver Service Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Ice Machine Usage with Non-Manitowoc Multi-Circuit Condensers
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Head Pressure Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Condenser Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condenser DT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Connect Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Non-Manitowoc Multi-Circuit Condenser Sizing Chart . . . . . . . . . . . . . . . . .
Installation Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional Checks for Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Starting the Ice Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AuCS® Automatic Cleaning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-11
2-11
2-11
2-11
2-12
2-12
2-12
2-12
2-12
2-13
2-14
2-14
2-15
2-15
2-16
2-17
2-17
2-17
2-18
2-18
2-18
2-18
2-18
2-18
2-18
2-18
2-19
2-20
2-20
2-21
2-21

Section 3
Ice Machine Operation
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Start-Up or Start-Up After Automatic Shut-Off . . . . . . . . . . . . . . . . . .
Freeze Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Harvest Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Shut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warm Water Rinse Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operational Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Harvest Sequence Water Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1
3-2
3-2
3-2
3-3
3-3
3-3
3-3
3-4
3-4
3-4
3-4
3-5

Part No. 80-1480-3

Table of Contents (continued)
Section 4
Maintenance
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Machine Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water-Cooled Condenser and Water Regulating Valve . . . . . . . . . . . . . . . . .
AlphaSan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Guardian . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sachet Replacement Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sachet Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clean Up Procedure for Damaged Packet . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Cleaning and Sanitizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sanitizing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal of Parts For Cleaning/Sanitizing . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Front Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal from Service/Winterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Contained Air-Cooled Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . .
Water-Cooled Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Ice Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AuCS Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1
4-1
4-1
4-1
4-2
4-2
4-3
4-3
4-3
4-3
4-3
4-4
4-4
4-4
4-5
4-6
4-12
4-13
4-13
4-13
4-13
4-13
4-13

Section 5
Before Calling For Service
Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Limit Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1
5-2

Energized Parts Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Contained Air- And Water-Cooled Models . . . . . . . . . . . . . . . . . . . . .
Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagram Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Contained Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagram Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S300/S320/S420/ S450- Self Contained - 1 Phase . . . . . . . . . . . . . . . . . .
S500/S600/S850/S1000 - Self Contained - 1 Phase . . . . . . . . . . . . . . . . .
S850/S1000 - Self Contained - 3 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . .
S500/S600/S850/S1000 - Remote - 1 Phase . . . . . . . . . . . . . . . . . . . . . . .
S850/S1000 - Remote - 3 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S1400/S1800 - Self-Contained - 1 Phase . . . . . . . . . . . . . . . . . . . . . . . . . .
S1400/S1800 - Self-Contained - 3 Phase . . . . . . . . . . . . . . . . . . . . . . . . . .
S1400/S1800 - Remote - 1 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S1400/S1800 - Remote - 3 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Specifications and Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bin Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compressor Electrical Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PTCR Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosing Start Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ICE/OFF/CLEAN Toggle Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-1
6-1
6-2
6-3
6-3
6-11
6-18
6-18
6-19
6-20
6-21
6-22
6-23
6-24
6-25
6-26
6-27
6-28
6-28
6-28
6-30
6-31
6-34
6-34
6-35

Section 6
Electrical System

Part No. 80-1480-3

Table of Contents (continued)
Ice Thickness Probe (Harvest Initiation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How The Probe Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Harvest Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeze Time Lock-In Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Freeze Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosing Ice Thickness Control Circuitry . . . . . . . . . . . . . . . . . . . . . . . . .
Water Level Control Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Level Probe Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Inlet Valve Safety Shut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeze Cycle Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Harvest Cycle Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosing Water Level Control Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosing An Ice Machine That Will Not Run . . . . . . . . . . . . . . . . . . . . . . . .

6-37
6-37
6-37
6-37
6-37
6-37
6-38
6-39
6-39
6-39
6-39
6-39
6-40
6-42

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Contained Air or Water -Cooled Models . . . . . . . . . . . . . . . . . . . . . . . .
Remote Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S1400/S1800 Self-Contained Tubing Schematic . . . . . . . . . . . . . . . . . . . .
S1400/S1800 Remote Tubing Schematic . . . . . . . . . . . . . . . . . . . . . . . . . .
Operational Analysis (Diagnostics) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Beginning Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Production Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation/Visual Inspection Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water System Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Formation Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analyzing Discharge Pressure
During Freeze or Harvest Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analyzing Suction Pressure
During Freeze Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single Expansion Valve Ice Machines Comparing Evaporator Inlet and Outlet Temperatures . . . . . . . . . . . . . . . .
Harvest Valve Temperature Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Discharge Line Temperature Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use the Refrigeration System
Operational Analysis Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigeration System Operational Analysis Tables . . . . . . . . . . . . . . . . . . .
Refrigeration System Operational Analysis Tables . . . . . . . . . . . . . . . . . . .
Harvest Pressure Regulating
(H.P.R.) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headmaster Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Control Specifications and Diagnostics . . . . . . . . . . . . . . . . . . . . .
Fan Cycle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Pressure Cut-Out (HPCO) Control . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts . . . . . . . . .
S300 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S320 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S420 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S450 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S500 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S600 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S850 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S1000 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S1400 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S1800 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-1
7-1
7-3
7-6
7-7
7-8
7-8
7-9
7-9
7-10
7-10
7-11
7-13

Section 7
Refrigeration System

7-16
7-17
7-19
7-20
7-21
7-22
7-23
7-24
7-25
7-27
7-29
7-29
7-29
7-30
7-31
7-32
7-33
7-34
7-35
7-36
7-38
7-39
7-41
7-42

Part No. 80-1480-3

Table of Contents (continued)
Refrigerant Recovery/Evacuation and Recharging . . . . . . . . . . . . . . . . . . . .
Normal Self-Contained Model Procedures . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Remote Model Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Contamination Clean-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Pressure Controls Without
Removing Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total System Refrigerant Charges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Re-Use Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HFC Refrigerant Questions and Answers . . . . . . . . . . . . . . . . . . . . . . . . . .

Part No. 80-1480-3

7-44
7-44
7-46
7-50
7-52
7-54
7-55
7-56
7-57
7-58

Table of Contents (continued)

Part No. 80-1480-3

Section 1

General Information

Section 1
General Information
Model Numbers

How to Read a Model Number

This manual covers the following models:
Self-Contained
Air-Cooled
SD0302A
SY0304A
SD0322A
SY0324A
SR0420A
SD0422A
SY0424A
SD0452A
SY0454A
SR0500A
SD0502A
SY0504A
SD0602A
SY0604A
SR0850A
SD0852A
SY0854A
SD1002A
SY1004A
SD1402A
SY1404A
SR1800A
SD1802A
SY1804A

Self-Contained
Water-Cooled
SD0303W
SY0305W
SD0323W
SY0325W
SR0421W
SD0423W
SY0425W
SD0453W
SY0455W
SR501W
SD0503W
SY0505W
SD0603W
SY0605W
SR0851W
SD0853W
SY0855W
SD1003W
SY1005W
SD1403W
SY1405W
SR1801W
SD1803W
SY1805W

Remote
------------------------SD0592N
SY0594N
SD0692N
SY0694N
SR0890N
SD0892N
SY0894N
SD1092N
SY1094N
SD1492N
SY1494N
SR1890N
SD1892N
SY1894N

9 REMOTE
AIR-COOLED

# CUBE SIZE

CONDENSER TYPE

0
1
2
3
4
5

AIR-COOLED
WAT ER-COOLED
AIR-COOLED
WAT ER-COOLED
AIR-COOLED
WAT ER-COOLED

REGULAR
REGULAR
DICE
DICE
HALF-DICE
HALF-DICE

S Y 1094
ICE MACHINE
MODEL
ICE CUBE SIZE
R REGULAR
D DICE
Y HALF DICE

ICE MACHINE
SERIES
CONDENSER TYPE
A SELF-CONTAINED AIR-COOLED
W SELF-CONTAINED WAT ER-COOLED
N REMOTE AIR-COOLED

Ice Cube Sizes

Regular

Dice

Half Dice

1-1/8" x 1-1/8" x 7/8"
7/8" x 7/8" x 7/8"
3/8" x 1-1/8" x 7/8"
2.86 x 2.86 x 2.22 cm 2.22 x 2.22 x 2.22 cm 0.95 x 2.86 x 2.22 cm

NOTE: Model numbers ending in 3 indicate a 3-phase
unit. Example: SY1004A3

! 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
PERSONAL INJURY POTENTIAL
Remove all ice machine panels before lifting and
installing.

Part Number 80-1480-3

1-1

General Information

Section 1

Accessories

MANITOWOC CLEANER AND SANITIZER

Contact your Manitowoc distributor for these optional
accessories:

Manitowoc Ice Machine Cleaner and Sanitizer are
available in convenient 16 oz. (473 ml) bottles. These
are the only cleaner and sanitizer approved for use with
Manitowoc products.

BIN CASTER
Replaces standard legs.
ICE BAGGER
Maximize profits from bagged ice sales with this
convenient accessory. This sturdy unit rests on the bin
door frame, and adapts for left or right side filling.
GUARDIANf SACHET PACKETS
Guardian sachet packets release chlorine dioxide on a
controlled basis to inhibit the growth of bacteria and
slime.
Guardian sachet packets are available through your
local Manitowoc Ice Machine dealer.
ARCTIC PUREf WATER FILTER SYSTEM
Engineered specifically for Manitowoc ice machines,
This water filter is an efficient, dependable, and
affordable method of inhibiting scale formation, filtering
sediment, and removing chlorine taste and odor.

1-2

Cleaner Part Number
16 ounce Bottle - 94-0546-3
AuCS®-SO - 94-0546-3
AuCS®-SI - 40-1326-3

Sanitizer Part Number
16 ounce Bottle - 94-0565-3
AuCS®-SO - 94-0565-3
AuCS®-SI - 40-1327-3

AUCS® AUTOMATIC CLEANING SYSTEM
This accessory reduces equipment cleaning expense.
The AuCS® accessory monitors ice making cycles and
initiates cleaning procedures automatically.
DISPENSER
A counter-top dispenser is ideal for cafeterias and many
types of self-service facilities. Manitowoc auto-fill, floorstanding ice dispensers meet the strict sanitary
requirements of the food service, lodging and health
care industries.

Part Number 80-1480-3

Section 1

General Information

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.

SV13147

MODEL/SERIAL DECAL
LOCATION

Model/Serial Number Location

Part Number 80-1480-3

1-3

General Information

Section 1

Owner Warranty Registration Card
GENERAL

EXCLUSIONS

The packet containing this manual also includes
warranty information. Warranty coverage begins the day
your new ice machine is installed.

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

Important
Complete and mail the OWNER WARRANTY
REGISTARATION CARD as soon as possible to
validate the installation date.
If you do not return your OWNER WARRANTY
REGISTRATION CARD, Manitowoc will use the date of
sale to the Manitowoc Distributor as the first day of
warranty coverage for your new ice machine.

Warranty Coverage
GENERAL

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.

The following Warranty outline is provided for your
convenience. For a detailed explanation, read the
warranty bond shipped with each product.

5. Parts or assemblies subjected to misuse, abuse,
neglect or accidents.

Contact your local Manitowoc Distributor, Manitowoc Ice,
Inc. or visit our website at www.manitowocice.com if you
need further warranty information.

6. Damage or problems caused by installation,
cleaning and/or maintenance procedures
inconsistent with the technical instructions
provided in this manual.

Important
This product is intended exclusively for commercial
application. No warranty is extended for personal,
family, or household purposes.
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.

1-4

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.
NOTE: If the dealer you purchased the ice machine from
is not authorized to perform warranty service, contact
your Manitowoc distributor or Manitowoc Ice, Inc. for the
name of the nearest authorized service representative.
Service Calls
Normal maintenance, adjustments and cleaning as
outlined in this manual are not covered by the
warranty. If you have followed the procedures listed on
page 5-1 of this manual, and the ice machine still does
not perform properly, call your authorized service
company.

Part Number 80-1480-3

Section 2

Installation Instructions

Section 2
Installation Instructions
General
These instructions are provided to assist the qualified
installer. Check your local Yellow Pages for the name of
the nearest Manitowoc distributor, or call Manitowoc Ice,
Inc. for information regarding start-up services.

Important
Failure to follow these installation guidelines may
affect warranty coverage.

Ice Machine Dimensions
S320/S420 AIR AND WATER-COOLED ICE MACHINES

ELECTRICAL

AUCS
ELECTRICAL

2.20" (5.58cm)
5.0" (12.7cm)

H
19.3"
(49.0 cm)

3.25" (8.3cm)
4" (10cm)

2.6"
1.8"
(6.6cm)(4.6cm)

AUCS
TUBING &
MODULAR
WIRE

4.21" (10.69cm)

5.06" (12.85cm)

2.85" (7.30cm)

1.1" (2.6cm)
6.68" (16.96cm)

8.49" (21.56cm)
17.0" (43.2cm)

Ice Machine
S320
S420

Part Number 80-1480-3

CONDENSER WATER
OUTLET 1/2"FPT
(Water-Cooled Only)

Dimension W
22 in. (55.9 cm)
22 in. (55.9 cm)

AUXILLARY BASE DRAIN
1/2"CPVC SOCKET
WATER INLET
CONDENSER WATER
3/8"FPT
INLET 3/8"FPT
(Water-Cooled Only)
DRAIN 1/2"NPTF

Dimension D
24.5 in. (62.2 cm)
24.5 in. (62.2 cm)

Dimension H
21.5 in (54.6 cm)
21.5 in (54.6 cm)

2-1

Installation Instructions

Section 2

S600 AIR AND WATER-COOLED ICE MACHINES

1.50" (3.81cm)

ELECTRICAL
8.50" (21.60cm)

AUCS
CONNECTIONS

6.50" (16.5cm)

CONDENSER WATER
OUTLET 1/2"FPT
(Water-Cooled Only)

2.61"
(6.62cm)
5.06" (12.85cm)
1.81"
6.68" (16.96cm)
(4.59cm)

2.85" (7.30cm)

D
AUXILLARY BASE DRAIN
1/2"CPVC SOCKET
CONDENSER WATER
INLET 3/8"FPT
(Water-Cooled Only)
DRAIN 1/2"NPTF

7.75" (19.7 cm)

WATER INLET
3/8"FPT

4.25" (10.81 cm)

17.25" (43.81 cm)

Ice Machine
S600

Dimension A
11.5 in (29.2 cm)

Dimension B
9.0 in (22.9 cm)

Dimension W
30 in. (76.2 cm)

Dimension D
24.50 in. (62.2 cm)

Dimension H
21.5 in (54.6 cm)

S600 REMOTE ICE MACHINES

ELECTRICAL

1.50" (3.81cm)

A
B

REMOTE CONDENSER
ELECTRICAL

1.81"
(4.59cm)

2.61"
(6.62cm)

6.25" (15.88cm)

5.06" (12.85cm)

AUXILLARY BASE
DRAIN 1/2"CPVC
SOCKET

6.68" (16.96cm)
11.50" (29.21cm)

WATER INLET
3/8"FPT

16.0" (40.64cm)

DRAIN 1/2"NPTF

Ice Machine
S600

2-2

Dimension A
11.5 in (29.2 cm)

Dimension B
9.0 in (22.9 cm)

Dimension W
30 in. (76.2 cm)

REFRIGERANT
LIQUID LINE
REFRIGERANT
DISCHARGE LINE

Dimension D
24.50 in. (62.2 cm)

Dimension H
21.5 in (54.6 cm)

Part Number 80-1480-3

Section 2

Installation Instructions

S300/S450/S500/S850/S1000 AIR AND WATER-COOLED ICE MACHINES

ELECTRICAL
2.20" (5.58cm)

A
B

C
E
1.81"
(4.59cm)

2.61"
(6.62cm)

AUCS
CONNECTIONS

4.21" (10.69cm)

2.85" (7.30cm)

5.06" (12.85cm)

1.06 (2.7cm)
6.68" (16.96cm)

CONDENSER WATER
OUTLET 1/2"FPT
(Water-Cooled Only)

D
AUXILLARY BASE
DRAIN 1/2"CPVC
SOCKET

8.49" (21.56cm)
25.52" (64.82cm)

SV3143

CONDENSER WATER
INLET 3/8"FPT
(Water-Cooled Only)

WATER INLET
3/8"FPT

SV3143B

DRAIN 1/2"NPTF

Width, Depth, and Height Dimensions
Ice Machine
S300
S450
S500
S850
S1000

Dimension W
30 in. (76.2 cm)
30 in. (76.2 cm)
30 in. (76.2 cm)
30 in. (76.2 cm)
30 in. (76.2 cm)

Dimension D
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)

Dimension H
16.5 in (41.9 cm)
21.5 in (54.6 cm)
21.5 in (54.6 cm)
26.5 in (67.3 cm)
26.5 in (67.3 cm)

Electrical and AuCS Dimensions
Ice Machine
S300
S450
S500
S850
S1000

Electrical
Dimension A
Dimension B
14.00 in (35.6 cm)
NA
19.25 in (48.9 cm)
17.5 in (44.45 cm)
19.25 in (48.9 cm)
17.5 in (44.45 cm)
23.82 in (60.5 cm) 22.32 in (56.69 cm)
23.82 in (60.5 cm) 22.32 in (56.69 cm)

Part Number 80-1480-3

Dimension C
10.0 in (25.4 cm)
8.5 in (21.6 cm)
8.5 in (21.6 cm)
8.5 in (21.6 cm)
8.5 in (21.6 cm)

AuCS
Dimension E
6.0 in (15.24 cm)
8.5 in (21.6 cm)
8.5 in (21.6 cm)
8.5 in (21.6 cm)
8.5 in (21.6 cm)

Dimension F
4.0 in (10.16 cm)
6.5 in (16.5 cm)
6.5 in (16.5 cm)
6.5 in (16.5 cm)
6.5 in (16.5 cm)

2-3

Installation Instructions

Section 2

S500/S850/S1000 REMOTE ICE MACHINES

ELECTRICAL

REMOTE CONDENSER
ELECTRICAL

2.20" (5.58cm)

H
B

1.81"
(4.59cm)

2.61"
(6.62cm)

1.06 (2.69cm)

6.12" (15.54cm)

5.06" (12.85cm)

6.68" (16.96cm)
12.26" (42.27cm)

WATER INLET
3/8"FPT

16.64" (64.82cm)

DRAIN 1/2"NPTF

SV3146

Ice Machine
S300
S450
S500
S850
S1000

2-4

Dimension A
14.00 in (35.6 cm)
19.25 in (48.9 cm)
19.25 in (48.9 cm)
23.82 in (60.5 cm)
23.82 in (60.5 cm)

Dimension B
NA
17.5 in (44.45 cm)
17.5 in (44.45 cm)
22.32 in (56.69 cm)
22.32 in (56.69 cm)

Dimension W
30 in. (76.2 cm)
30 in. (76.2 cm)
30 in. (76.2 cm)
30 in. (76.2 cm)
30 in. (76.2 cm)

REFRIGERANT
LIQUID LINE
REFRIGERANT
DISCHARGE LINE

Dimension D
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)
24.50 in. (62.2 cm)

SV3146B

Dimension H
16.5 in (41.9 cm)
21.5 in (54.6 cm)
21.5 in (54.6 cm)
26.5 in (67.3 cm)
26.5 in (67.3 cm)

Part Number 80-1480-3

Section 2

Installation Instructions

S1400 / S1800 AIR AND WATER-COOLED ICE MACHINES

2.50" (6.35cm)

ELECTRICAL

A
B

C
11.0" (27.9cm)

AuCS
Connections

E
2.0" (5.1cm)

WATER INLET
3/8"FPT

5.75" (14.6cm)

CONDENSER WATER
OUTLET 1/2"FPT
(Water-Cooled Only)

1.1" (2.8cm)

4.0"
7.8" (19.8cm)
(10.2cm)
10.25" (26.0cm)

CONDENSER WATER
INLET 3/8"FPT
(Water-Cooled Only)

D
3.0" (7.6cm)

11.0" (27.9cm)

3.75" (9.5cm)

AUXILLARY BASE DRAIN
1/2"CPVC SOCKET

DRAIN 1/2"NPTF

Width, Depth, and Height Dimensions
Ice Machine
S1400
S1800

Dimension W
48 in. (121.9 cm)
48 in. (121.9 cm)

Dimension D
24.5 in. (62.2 cm)
24.5 in. (62.2 cm)

Dimension H
29.5 in (74.9 cm)
29.5 in (74.9 cm)

Electrical and AuCS Dimensions
Electrical
Dimension A
Dimension B
22.75 in (57.8 cm)
22.25 in (56.5 cm)
22.75 in (57.8 cm)
22.25 in (56.5 cm)

Ice Machine
S1400
S1800

AuCS
Dimension E
9.5 in (24.1 cm)
9.5 in (24.1 cm)

Dimension C
14.0 in (35.6 cm)
14.0 in (35.6 cm)

Dimension F
7.5 in (19.1 cm)
7.5 in (19.1 cm)

S1400 / S1800 REMOTE ICE MACHINES

2.50" (6.35cm)

ELECTRICAL

A
B

C
11.0" (27.9cm)
8.0"
(20.3cm)

AuCS
Connections
WATER INLET
3/8"FPT

E
2.0" (5.1cm)

CONDENSER WATER
INLET 3/8"FPT
(Water-Cooled Only)

5.75" (14.6cm)

1.1" (2.8cm)

4.0"
7.8" (19.8cm)
(10.2cm)
10.25" (26.0cm)

CONDENSER WATER
OUTLET 1/2"FPT
(Water-Cooled Only)

D
3.0" (7.6cm)

11.0" (27.9cm)

AUXILLARY BASE DRAIN
1/2"CPVC SOCKET

3.75" (9.5cm)

REFRIGERANT
LIQUID LINE
DRAIN 1/2"NPTF

23.75" (60.3cm)
28.25" (71.8cm)

REFRIGERANT
DISCHARGE LINE

Ice Machine
S1400
S1800

Dimension A
22.75 in (57.8 cm)
22.75 in (57.8 cm)

Part Number 80-1480-3

Dimension B
22.25 in (56.5 cm)
22.25 in (56.5 cm)

Dimension W
48 in. (121.9 cm)
48 in. (121.9 cm)

Dimension D
24.5 in. (62.2 cm)
24.5 in. (62.2 cm)

Dimension H
29.5 in (74.9 cm)
29.5 in (74.9 cm)

2-5

Installation Instructions

Section 2

Ice Storage Bin Dimensions
30 INCH (76 CM) ICE STORAGE BINS

48 INCH (130 CM) ICE STORAGE BINS

SV1609

Bin Model
B170
B420
B570

SV1297

Dimension A
29.5 in (74.9 cm)
34.0 in (86.3 cm)
34.0 in (86.3 cm)

Dimension B
19.1 in (48.5 cm)
32.0 in (81.3 cm)
44.0 in (111.7 cm)

B970

Remote Condenser Dimensions
JC0495/JC0895/JC1395

22 INCH (56 CM) ICE STORAGE BINS

SV1297

SV1614

Bin Model
B320
B420

2-6

Dimension A
34.0 in (86.3 cm)
34.0 in (86.3 cm)

Dimension B
32.0 in (81.3 cm)
44.0 in (111.7 cm)

Part Number 80-1480-3

Section 2

Installation Instructions

Location of Ice Machine

Ice Machine Heat of Rejection

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).

•

Remote air cooled - The air temperature must be at
least -20°F (-29°C), but must not exceed 120°F
(49°C)

•

The location must not be near heat-generating
equipment or in direct sunlight and must be protected
from weather.

•

The location must not obstruct air flow through or
around the ice machine. Refer to the chart below for
clearance requirements.
S300 / S320/
S420/ S450/S500/
S600/S850/S1000
Top/Sides
Back

S1400/S1800
Top/Sides
Back

Self-Contained
Air-Cooled

Water-Cooled
and Remote*

8" (20.3 cm)
5" (12.7 cm)

Self-Contained
Air-Cooled
24" (61.0 cm)
12" (30.5 cm)

Water-Cooled
and Remote*
8" (20.3 cm)
5" (12.7 cm)

*There is no minimum clearance required for water-cooled or
remote ice machines. This value is recommended for efficient
operation and servicing only.

Series
Ice Machine
S300
S320
S420
S450
S500
S600
S850
S1000
S1400
S1800

Heat of Rejection
Air Conditioning
Peak
3800
6000
3800
6000
7000
9600
7000
9600
7000
9600
9000
13900
12000
18000
16000
22000
19000
28000
24000
36000

B.T.U./Hour
Because the heat of rejection varies during the ice making cycle,
the figure shown is an average.

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 aircooled 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.

! 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”.

Part Number 80-1480-3

2-7

Installation Instructions

Section 2

Removing Drain Plug and Leveling the Ice
Storage Bin
1. Remove threaded plug from drain fitting.
2. Screw the leveling legs onto the bottom of the bin.
3. Screw the foot of each leg in as far as possible.

! Caution
The legs must be screwed in tightly to prevent them
from bending.

Air-Cooled Baffle
SELF-CONTAINED AIR-COOLED ONLY
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.

4. Move the bin into its final position.
5. Level the bin to assure that the bin door closes and
seals properly. Use a level on top of the bin. Turn the
base of each foot as necessary to level the bin.
6. Inspect bin gasket prior to ice machine installation.
(Manitowoc bins come with a closed cell foam
gasket installed along the top surface of the bin.)

AIR
BAFFLE

7. Remove all panels from ice machine before lifting.
Remove both front panels, top cover, left and right
side panels.

SCREWS

8. Install ice machine on bin.

THREAD LEVELING
LEG INTO BASE OF
CABINET

SV1607

Air Baffle

SV1606

Leveling Leg and Foot

2-8

Part Number 80-1480-3

Section 2

Installation Instructions

Electrical Service
Important

GENERAL

Observe correct polarity of incoming line voltage.

! Warning
All wiring must conform to local, state and national
codes.
VOLTAGE
The maximum allowable voltage variation is ±10% of the
rated voltage at ice machine start-up (when the electrical
load is highest).

! Warning
The ice machine must be grounded in accordance
with national and local electrical codes.

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.
ELECTRICAL REQUIREMENTS
Refer to Ice Machine Model/Serial Plate for voltage/
amperage specifications.

S Series Ice Machines (* indicates preliminary data)
Ice Machine

S300

S320

S420/S450

S500

S600

S850

S1000

S1400

S1800

Voltage
Phase
Cycle
115/1/60
230/1/50
115/1/60
208-230/1/60
230/1/50
115/1/60
208-230/1/60
230/1/50
115/1/60
208-230/1/60
230/1/50
208-230/1/60
230/1/50
208-230/1/60
208-230/3/60
230/1/50
208-230/1/60
208-230/3/60
230/1/50
208-230/1/60
208-230/3/60
230/1/50
208-230/1/60
208-230/3/60
230/1/50

Part Number 80-1480-3

Air-Cooled
Maximum
Minimum
Fuse/Circuit
Circuit Amps
Breaker
20
12.9
15
6.4
15
11.3
15
6.0
15
6.0
20
13.6
15
6.3
15
6.7
20
13.0
15
7.3
15
6.5
15
8.3
15
6.7
20
11.3
15
7.8
20
10.5
20
13.6
15
9.9
20
12.6
30
17.5
20
13.2
30
15.1
40
23.5
20
13.4
40
21.9

Water Cooled
Maximum
Minimum
Fuse/Circuit
Circuit Amps
Breaker
20
12.1
15
5.9
15
10.5
15
5.6
15
5.6
20
12.9
15
5.9
15
6.4
20
12.3
15
6.9
15
5.9
15
7.9
15
6.1
20
10.3
15
6.8
20
9.1
20
12.6
15
8.9
20
11.2
30
16.1
20
11.8
30
13.7
40
22.1
20
12.0
40
20.5

Remote
Maximum
Minimum
Fuse/Circuit
Circuit Amps
Breaker
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
20
14.1
N/A
N/A
N/A
N/A
15
8.9
15
7.1
20
10.6
15
7.8
20
9.7
20
12.8
15
9.9
20
12.0
30
17.1
20
12.8
30
14.7
40
23.1
20
13.0
40
21.5

2-9

Installation Instructions

Section 2

Self-Contained Electrical Wiring Connections
! Warning
These diagrams are not intended to show proper
wire routing, wire sizing, disconnects, etc., only the
correct wire connections.

SELF CONTAINED ICE MACHINE
208-230/3/60

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.
SELF CONTAINED ICE MACHINE
115/1/60 OR 208-230/1/60

GROUND

L1
N=115V
OR
L2=208-230V

GROUND

SV1258

TO SEPARATE
FUSE/BREAKER

ICE MACHINE
CONNECTIONS

SV1190
L1

GROUND

ICE MACHINE
CONNECTIONS

SELF CONTAINED ICE MACHINE
230/1/50

GROUND

TO SEPARATE
FUSE/BREAKER
N

GROUND
GROUND

ICE MACHINE
CONNECTIONS
SV1191

TO SEPARATE
FUSE/BREAKER.
DISCONNECT ALL
POLES.

For United Kingdom Only
As the colors of the wires in the mains lead of the appliance may not correspond with the colored markings
identifying the terminals in your plug, proceed as follows:
•

The wire which is colored 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 colored green or green and yellow.

•

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

•

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

2-10

Part Number 80-1480-3

Section 2

Installation Instructions

Remote Electrical Wiring Connections

REMOTE ICE MACHINE
WITH SINGLE CIRCUIT MODEL CONDENSER
208-230/3/60 OR 380-415/3/50

! Warning
These diagrams are not intended to show proper
wire routing, wire sizing, disconnects, etc., only the
correct wire connections.

SINGLE
CIRCUIT
REMOTE
CONDENSER

All electrical work, including wire routing and
grounding, must conform to local, state and national
electrical codes.

GROUND

Though wire nuts are shown in the drawings, the ice
machine field wiring connections may use either
wire nuts or screw terminals.

GROUND

F2
F1

REMOTE ICE MACHINE
WITH SINGLE CIRCUIT MODEL CONDENSER
115/1/60 OR 208-230/1/60

L1
SINGLE
CIRCUIT
L2
REMOTE
CONDENSER

NOTE: FAN
MOTOR IS
208-230V

ICE
MACHINE

NOTE:
CONDENSER FAN
MOTOR VOLTAGE
MATCHES ICE
MACHINE
VOLTAGE (115V
OR 208-230V)

L3
GROUND

GROUND
TO SEPARATE
FUSE/BREAKER

SV1199

REMOTE ICE MACHINE
WITH SINGLE CIRCUIT MODEL CONDENSER
230/1/50

F2
F1
ICE
MACHINE

L1
N=115V OR L2=208-230V

L2
GROUND

SV1255

L
SINGLE CIRCUIT 1
REMOTE
CONDENSER
L2

NOTE: FAN
MOTOR IS
220-240V

GROUND
TO SEPARATE
FUSE/BREAKER

ICE
MACHINE

F1
L1

N
GROUND

SV1256

Part Number 80-1480-3

GROUND
TO SEPARATE
FUSE/BREAKER
(220-240).
DISCONNECT ALL
POLES.

2-11

Installation Instructions

Section 2

Water Supply and Drain Requirements

DRAIN CONNECTIONS

WATER SUPPLY

Follow these guidelines when installing drain lines to
prevent drain water from flowing back into the ice
machine and storage bin:

Local water conditions may require treatment of the
water to inhibit scale formation, filter sediment, and
remove chlorine odor and taste.

Important
If you are installing a Manitowoc Arctic Puref water
filter system, refer to the Installation Instructions
supplied with the filter system for ice making water
inlet connections.

•

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.

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.

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.

•

Install a water shut-off valve for both the ice making
and condenser water lines.

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.

•

Insulate water inlet lines to prevent condensation.

•

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).

! Caution
Do not apply heat to water valve inlet fitting. This will
damage plastic valve body.

2-12

Part Number 80-1480-3

Section 2

Installation Instructions

WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS

! Caution
Plumbing must conform to state and local codes.

Location

Water Temperature

Water Pressure

Ice Machine Fitting

Ice Making
Water Inlet

35°F (1.6°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

Tubing Size Up to Ice
Machine Fitting
3/8" (.95 cm) minimum
inside diameter

Ice Making
Water Drain

---

1/2" Female
Pipe Thread

1/2" (1.27 cm) minimum
inside diameter

Condenser
Water Inlet

40°F (4.4°C) Min.
90°F (32.2°C) Max.

20 psi (137.9 kPA) Min.
150 psi (1034.2 kPA) Max.

Condenser
Water Drain

---

Bin Drain

---

3/8" Female Pipe Thread
1/2" Female
Pipe Thread
3/4" Female
Pipe Thread

1/2" (1.27 cm) minimum
inside diameter
3/4" (1.91 cm) minimum
inside diameter

3/8” FPT ICE MAKING WATER INLET FITTING,
PLASTIC FITTING ON OPPOSITE SIDE DO NOT
APPLY HEAT

ELECTRICAL ENTRANCE

18” (46 CM) VENT TUBE

3/8” FPT CONDENSER WATER INLET
(WATER COOLED UNITS ONLY
1/2” DRAIN CONNECTION
PLASTIC FITTING ON OPPOSITE
SIDE DO NOT APPLY HEAT

1/2” FPT CONDENSER WATER DRAIN
(WATER COOLED UNITS ONLY)
1/2” (1.3 CM) MIN
DRAIN ID

1/2” CPVC SOCKET AUXILLARY BASE
DRAIN

AIR GAP
DO NOT TRAP DRAIN LINE,
LEAVE AIR GAP BETWEEN
DRAIN TUBE AND DRAIN

OPEN, TRAPPED AND
VENTED DRAIN

SV3142

Typical Water Supply Drain Installation

Part Number 80-1480-3

2-13

Installation Instructions

Section 2

Remote Condenser/Line Set Installation

Ice Machine

S500

S600/S800/S1000

Remote Single
Circuit
Condenser
JC0495

JC0895

S1400/S1800

JC1395

*Line Set
RT
RL

Discharge Line
1/2" (1.27 cm)
1/2" (1.27 cm)

Line Set*
RT-20-R404A
RT-35-R404A
RT-50-R404A
RT-20-R404A
RT-35-R404A
RT-50-R404A
RL-20-R404A
RL-35-R404A
RL-50-R404A

IMPORTANT
EPA CERTIFIED TECHNICIANS
If remote line set length is between 50' and 100' (15.2530.5 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: ___________________

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.)

! Warning
Liquid Line
5/16" (.79 cm)
3/8" (.95 cm)

Air Temperature Around the Condenser
Minimum
Maximum
-20°F (-29°C)
120°F (49°C)

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.

! Caution

REMOTE ICE MACHINES
REFRIGERANT CHARGE

Never add more than nameplate charge to the
refrigeration system for any application.

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.

Ice Machine
S500
S600
S850
S1000
S1400
S1800

2-14

Nameplate Charge
(Charge Shipped in Ice Machine)
6 lb. (96 oz.)
6.5 lb.(104 oz)
8.5 lb. (136 oz.)
8.5 lb. (136 oz.)
11 lb. (176 oz.)
12.5 lb. (200 oz.)

Refrigerant to be Added for
50'-100' Line Sets
1.5 lb. (24 oz.)
1.5 lb. (24 oz.)
2 lb. (32 oz.)
2 lb. (32 oz.)
2 lb. (32 oz.)
1 lb. (16 oz.)

Maximum System Charge
(Never Exceed)
7.5 lb. (120 oz.)
8 lb. (128 oz.)
10.5 lb. (168 oz.)
10.5 lb. (168 oz.)
13 lb. (208 oz.)
13.5 lb. (216 oz.)

Part Number 80-1480-3

Section 2

Installation Instructions

GENERAL

GUIDELINES FOR ROUTING LINE SETS

Condensers must be mounted horizontally with the fan
motor on top.

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.

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.

! 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.

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 (as
shown below). 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 (as shown below). Do
not coil tubing vertically.
3. Required - Keep outdoor refrigerant line runs as
short as possible.

DOWNWARD
HORIZONTAL
SPIRAL

1
1

SV1204

Routing Line Sets

Part Number 80-1480-3

2-15

Installation Instructions

Section 2
Make the following calculations to make sure the line set
layout is within specifications.

CALCULATING REMOTE CONDENSER
INSTALLATION DISTANCES
Line Set Length

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.)

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 (-29°C) and 120°F (49°C),
with line set lengths of up to 100' (30.5 m).

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.)

Line Set Rise/Drop

3. Insert the measured horizontal distance into the
formula below. No calculation is necessary.

The maximum rise is 35' (10.7 m).
The maximum drop is 15' (4.5 m).

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.

! 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.
Calculated Line Set Distance
The maximum calculated 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.

Maximum Line Set Distance Formula
Step 1.
Step 2.
Step 3.
Step 4.

Measured Rise (35' [10.7 m] Maximum)
______ x 1.7
Measured Drop (15' [4.5 m] Maximum)
______ x 6.6
Measured Horizontal Distance (100' [30.5 m] Maximum)
Total Calculated Distance 150' (45.7 m)

=
=

_______
_______
_______
_______

H
R

SV1196

Combination of a Rise and a
Horizontal Run

2-16

Calculated Rise
Calculated Drop
Horizontal Distance
Total Calculated Distance

SV1195

Combination of a Drop and a
Horizontal Run

SV1194

Combination of a Rise, a Drop
and a Horizontal Run

Part Number 80-1480-3

Section 2

Installation Instructions

LENGTHENING OR REDUCING LINE SET LENGTHS

REMOTE RECEIVER SERVICE VALVE

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 receiver service valve is closed during shipment.
Open the valve prior to starting the ice machine.

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,
purge with nitrogen and insulate all tubing. Do not
change the tube sizes. Evacuate the lines and place
about 5 oz (143g) of vapor refrigerant charge in each
line.

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.

REMOVE FRONT, TOP,
AND LEFT SIDE PANEL
FOR ACCESS TO
RECEIVER VALVE

CONNECTING A LINE SET
TURN
COUNTERCLOCKWISE
TO OPEN

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 brassto-brass seating. Torque to the following
specifications:
Liquid Line
10-12 ft lb.
(13.5-16.2 N•m)

Discharge Line
35-45 ft lb.
(47.5-61.0 N•m)

SV1603

RECEIVER SERVICE
VALVE CAP (TURN
COUNTERCLOCKWISE
TO REMOVE)

Backseating the Receiver Service Valve

6. Check all fittings and valve caps for leaks.
7. Make sure Schraeder cores are seated and
Schraeder caps are on and tight.

Part Number 80-1480-3

2-17

Installation Instructions

Section 2

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

FAN MOTOR

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. S-Model ARI certified
standard ratings only apply when used with a Manitowoc
remote condenser.

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.

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.

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.
HEAD PRESSURE CONTROL VALVE
Any remote condenser connected to a Manitowoc SModel 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.

INTERNAL CONDENSER VOLUME
The multi-circuit condenser internal volume must not be
less than or exceed that used by Manitowoc (see chart
on next page). 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.)

! Caution
Never add more than nameplate charge to ice
machine for any application.
QUICK CONNECT FITTINGS

! Caution
Do not use a fan cycling control to try to maintain
discharge pressure. Compressor failure will result.

2-18

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.

Part Number 80-1480-3

Section 2

Installation Instructions

NON-MANITOWOC MULTI-CIRCUIT CONDENSER SIZING CHART
Ice
Machine
Model

Refrigerant
Type

Charge

Heat of Rejection
Average
Btu/hr

Peak
Btu/hr

Internal
Condenser
Volume (cu ft)
Min

Design
Pressure

Max

S500

R-404A

6 lbs.

7,000

9,600

0.020

0.035

S600

R404A

6.5 lbs.

9,000

13,900

0.045

0.060

S850

R-404A

8.5 lbs.

12,000

18,000

0.045

0.060

S1000
S1400

R-404A
R-404A

8.5 lbs.
11 lbs.

16,000
19,000

22,000
28,000

0.045
0.085

0.060
0.105

S1800

R-404A

12.5 lbs.

24,000

36,000

0.085

0.105

500 psig
(3447 kpa)
(34.47 bar)
safe working
pressure
2,500 psig
(17237 kpa)
(172.37 bar)
burst
pressure

Quick Connect StubsMale Ends
Discharge

Liquid

Head
Pressure
Control
Valve

coupling
P/N
83-6035-3

coupling
P/N
83-6034-3

Manitowoc
P/N
83-6809-3

mounting
flange P/N
83-6006-3

no
mounting
flange P/N substitutes
83-6005-3

SINGLE CIRCUIT REMOTE
CONDENSER

ELECTRICAL
DISCONNECT
DISCHARGE
LINE

LIQUID LINE

TO CIRCUIT
BREAKER
PANEL

ELECTRICAL
DISCONNECT
ICE MACHINE

ELECTRICAL
SUPPLY
36.00"
(91.44 cm)
DROP
BIN

DISCHARGE
REFRIGERANT
LINE

LIQUID
REFRIGERANT
LINE
SV1615

Typical Single Circuit Remote Condenser Installation

Part Number 80-1480-3

2-19

Installation Instructions

Section 2

Installation Check List

F
F
F
F
F
F
F
F
F

Is the Ice Machine level?
Has all of the internal packing been
removed?
Have all of the electrical and water
connections been made?

F
F
F

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 (1.6° - 43.3°C)?
Has the ice machine been installed where the
incoming water temperature will remain in the
range of 35° - 90°F (1.6° - 32.2°C)?
Is there a separate drain for the water-cooled
condenser?

F
F

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 to check/set
the correct ice bridge thickness).

Additional Checks for Remote Models

F
Is there a separate drain for the bin?

F
F
F
F

2-20

Are the ice machine and bin drains vented?

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 ( -29 - 49°C).
Is the line set routed properly?
Are both refrigeration lines to remote
condenser run so they do not lay in water
and are properly insulated?

Part Number 80-1480-3

Section 2

Installation Instructions

Before Starting the Ice Machine

AuCS® Automatic Cleaning System

All Manitowoc ice machines are factory-operated and
adjusted before shipment. Normally, new installations do
not require any adjustment.

This optional accessory monitors ice making cycles and
initiates cleaning procedures automatically. The AuCS®
accessory can be set to automatically clean or sanitize
the ice machine every 2, 4 or 12 weeks. Refer to the
AuCS® Installation, Use and Care Manual for details.

To ensure proper operation, follow the Operational
Checks in Section 3 of this manual. Starting the ice
machine and completing the Operational Checks are the
responsibilities of the owner/operator.
Adjustments and maintenance procedures outlined in
this manual are not covered by the warranty.

! Warning
Potential Personal Injury Situation
Do not operate equipment that has been misused.
abused, neglected, damaged, or altered/modified
from that of original manufactured specifications.

Part Number 80-1480-3

2-21

Installation Instructions

Section 2

THIS PAGE INTENTIONALLY LEFT BLANK

2-22

Part Number 80-1480-3

Section 3

Ice Machine Operation

Section 3
Ice Machine Operation
Component Identification

Water Distribution Tube

Toggle Switch

Water Curtain

Dump Valve

Check Valve
sv3149

Ice Thickness Probe

Bin Switch

Water Level Probe

Water Pump

Water Inlet Location
Water Inlet Valve
(Located in Refrigeration Compartment)
sv3150

Part Number 80-1480-3

3-1

Ice Machine Operation

Section 3

Sequence Of Operation
NOTE: The toggle switch must be in the ice position and
the water curtain must be in place on the evaporator
before the ice machine will start.
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.
When Used - The air compressor energizes for the last
10 seconds of the cycle.
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. The harvest valve(s)
remains on for 5 seconds during initial compressor startup and then shuts off.

FREEZE SEQUENCE
3. Prechill
The compressor is on for 30 seconds (60 seconds initial
cycle) prior to water flow, to prechill the evaporator. The
water fill valve remains on until the water level probe is
satisfied.
4. Freeze
The water pump restarts after the 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 10 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.
NOTE: Freeze lock is bypassed after moving the toggle
switch from OFF to ICE position for the first cycle only.

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.)

3-2

Part Number 80-1480-3

Section 3

Ice Machine Operation

HARVEST SEQUENCE

SAFETY TIMERS

5. Water Purge

The control board has the following non-adjustable
safety timers:

The harvest valve(s) opens at the beginning of the water
purge to divert hot refrigerant gas into the evaporator.
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.
After the 45 second water purge, the water fill valve,
water pump and dump valve de-energize. (Refer to
“Water Purge Adjustment” for details.)

•

The ice machine is locked into the freeze cycle for 6
minutes before a harvest cycle can be initiated.
Freeze lock is bypassed after moving the toggle
switch from OFF to ICE position for the first cycle
only.

•

The maximum freeze time is 60 minutes at which
time the control board automatically initiates a
harvest sequence (steps 5 & 6).

•

The maximum harvest time is 3.5 minutes at which
time the control board automatically initiates a freeze
sequence (steps 3 & 4).

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.)
When Used - The air compressor energizes after 35
seconds and remains energized throughout the entire
harvest cycle. The air compressor will automatically
energize for 60 seconds when the harvest cycle time
exceeded 75 seconds in the previous cycle.
AUTOMATIC SHUT-OFF

WARM WATER RINSE CYCLE
Closing the back of the evaporator allows ice to build up
on the rear of the evaporator and the plastic evaporator
frame parts. After 200 freeze/harvest cycles have been
complete the control board will initiate a warm water
rinse.
After the 200th harvest cycle ends:
•

The Clean and Harvest LED’s energize to indicate
the ice machine is in a warm water rinse.

•

The compressor and harvest valve remain
energized.

•

The water pump energizes.

•

The water inlet valve energizes until water contacts
the water level probe.

•

The compressor and harvest valve warm the water
for 5 minutes, then de-energize.

•

The water pump remains energized for an additional
5 minutes (10 minute total on time) then deenergizes.

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 30 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.

Part Number 80-1480-3

NOTE: The warm water rinse cycle can be terminated by
moving the toggle switch to the OFF position, then back to ICE.

3-3

Ice Machine Operation

Section 3

Operational Checks

ICE THICKNESS CHECK

GENERAL

The ice thickness probe is factory-set to maintain the ice
bridge thickness at 1/8" (.32 cm).

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.

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" (.32 cm) thick.
2. If adjustment is necessary, turn the ice thickness
probe adjustment screw clockwise to increase
bridge thickness, counterclockwise to decrease
bridge thickness. Set at 1/4” gap between ice
machine and evaporator as starting point, then
adjust to achieve a 1/8” bridge thickness.

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.). Clean the water level probe with ice machine
cleaner, rinse thoroughly and re-check operation. Repair
or replace the probe as necessary.

ADJUSTING SCREW

1/8” ICE BRIDGE THICKNESS

SV3132

Ice Thickness Check
3. Make sure the ice thickness probe wire and the
bracket do not restrict movement of the probe.

Water Level Probe Location

3-4

Part Number 80-1480-3

Section 3

Ice Machine Operation

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.

! Warning

•

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.

Disconnect electric power to the ice machine at the
electrical disconnect before proceeding.

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.
•

The harvest sequence water purge is factory set for
45 seconds. Repositioning the jumper will set the
harvest water purge to 0 seconds. This setting does
not affect the SeCs or AuCs (cleaning) sequences.

45 second
setting

0 second
setting

SV3139
SV3140

Water Purge Adjustment
For your safety and to eliminate errors, we recommend
that a qualified service technician make the harvest
water purge adjustment.

Part Number 80-1480-3

3-5

Ice Machine Operation

Section 3

THIS PAGE INTENTIONALLY LEFT BLANK

3-6

Part Number 80-1480-3

Section 4

Maintenance

Section 4
Maintenance
General

Cleaning the Condenser

You are responsible for maintaining the ice machine in
accordance with the instructions in this manual.
Maintenance procedures are not covered by the
warranty.

GENERAL

! Warning
If you do not understand the procedures or the
safety precautions that must be followed, call your
local Manitowoc service representative to perform
the maintenance procedures for you.
We recommend that you perform the following
maintenance procedures a minimum of once every six
months to ensure reliable, trouble-free operation and
maximum ice production.

Ice Machine Inspection
! Warning
Disconnect electric power to the ice machine and
the remote condensing unit at the electric service
switch before cleaning the condenser.
Check all water fittings and lines for leaks. Also, make
sure the refrigeration tubing is not rubbing or vibrating
against other tubing, panels, etc.
Do not put anything (boxes, etc.) on the sides or back of
the ice machine. There must be adequate airflow
through and around the ice machine to maximize ice
production and ensure long component life.

Exterior Cleaning
Clean the area around the ice machine as often as
necessary to maintain cleanliness and efficient
operation. Use cleaners designed for use with stainless
steel products.

! Warning
Disconnect electric power to the ice machine head
section and the remote condensing unit at the
electric service switches before cleaning the
condenser.
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.

! Warning
The condenser fins are sharp. Use care when
cleaning them.
1. The washable aluminum filter on self-contained ice
machines is designed to catch dust dirt lint and
grease. Clean the filter with a mild soap and water.
2. Clean the outside of the condenser with a soft brush
or a vacuum with a brush attachment. Be careful not
to bend the condenser fins.
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.
Continued on Next Page...

Sponge any dust and dirt off the outside of the ice
machine with mild soap and water. Wipe dry with a
clean, soft cloth.
Heavy stains should be removed with stainless steel
wool. Never use plain steel wool or abrasive pads. They
will scratch the panels.

Part Number 80-1480-3

4-1

Maintenance

Section 4

4. Straighten any bent condenser fins with a fin comb.
“COMB” DOWN
ONLY

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

CONDENSER

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.

FIN
COMBS

Because the cleaning procedures require special pumps
and cleaning solutions, qualified maintenance or service
personnel must perform them.

AlphaSan
SV1515

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.

! Caution
If you are cleaning the condenser fan blades with
water, cover the fan motor to prevent water damage
and disconnect electrical power.

4-2

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.

Part Number 80-1480-3

Section 4

Maintenance

Guardianf
Slime is a leading cause of ice machine breakdowns and biological growth is a health concern. The Guardianf system
releases chlorine dioxide on a controlled basis to inhibit the growth of bacteria and fungi that form slime and cause
malodors in the food zone of ice machines. The Guardianf will not control mineral or other water borne buildup. Your
water quality will determine the length of time before mineral buildup affects ice machine performance. Mineral
buildup must be removed as often as necessary to ensure trouble-free operation of the ice machine.
INSTALLATION

SACHET REPLACEMENT FREQUENCY

If the Guardian system has been ordered, install the
sachet holder in the inside of the front panel.

Sachet packet(s) require replacement every thirty (30)
days or whenever they come in direct contact with water.
Refer to chart below for requirements.

1. Loosen the left screw and open the left front door.
The right front panel does not need to be removed.

Ice Machine
S300/S320/S420/S450/S500/S600
S850/S1000/S1400/S1800

Sachet Use
1
1 or 2*

*Although one sachet is recommended, extreme conditions may
necessitate using two sachet packets.

Guardianf sachet packets are available through your
local Manitowoc ice machine dealer.
SACHET REPLACEMENT PROCEDURE
1. Loosen the left screw and open the left front door.
The right front panel does not need to be removed.
Loosen
Screw

Screw Location
2. Inside the front panel there are two thumbscrew
holes covered by stickers, pierce the sticker with a
screwdriver.
3. Attach the sachet holder to the front panel by
inserting the thumbsrews through the holes in the
sachet holder and tightening the thumbscrews
4. Remove the new sachet packet from foil package
and install into holder. Removing the foil package
allows moisture in the air to activate the sachet
contents.
5. Close the left front door and tighten the screw.

2. Remove and discard spent Guardian sachet
packets.
3. Remove the new sachet packet from foil package
and install into holder. Removing the foil package
allows moisture in the air to activate the sachet
contents.
4. Close the left front door and tighten the screw.
5. Discard the use sachet packet in the trash.
CLEAN UP PROCEDURE FOR DAMAGED PACKET
1. Remove all ice from bin/dispenser and discard.
2. Initiate a cleaning and sanitizing sequence on the
ice machine (see next pages).
3. Clean the bin/dispenser. Flush the drain thoroughly
to prevent future drain blockage.
4. Sanitize the bin/dispenser.
5. Install a replacement sachet packet and reinstall all
panels.

Inside Left
Front Door

Guardian

Guardianf Location

Part Number 80-1480-3

4-3

Maintenance

Section 4

Interior Cleaning and Sanitizing
! Caution

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. An extremely
dirty ice machine must be taken apart for cleaning and
sanitizing.

! 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.

Never use anything to force ice from the evaporator.
Damage may result.
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 two minutes or until water starts to
flow over the evaporator.
Step 4 Add the proper amount of Manitowoc Ice
Machine Cleaner to the water trough.
Model
S300/S320/S420
S450/S500/S600/S850/S1000/
S1400/S1800

Amount of Cleaner
3 ounces (88 ml)
5 ounces (148 ml)
9 ounces (266 ml)

CLEANING PROCEDURE

! 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.
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 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 cycle is completed. This entire cycle lasts
approximately 30 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
self-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 self-cleaning cycle is completed, an
ice making sequence will start automatically.

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.

4-4

Part Number 80-1480-3

Section 4

Maintenance

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 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

! Caution
Never use anything to force ice from the evaporator.
Damage may result.

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.

! Warning
Disconnect electric power to the ice machine (and
dispenser if applicable) at the electric switch box
before proceeding.
Step 2 Refer to Removal of Parts For Cleaning/
Sanitizing and remove ice machine parts.
Step 3 Mix a solution of water and sanitizer.
Solution Type
Sanitizer

Water
4 gal. (15 l)

Part Number 80-1480-3

Mixed With
3 oz (90 ml) sanitizer

4-5

Maintenance

Section 4

REMOVAL OF PARTS FOR CLEANING/SANITIZING
1. Turn off the electrical and water supply to the ice
machine (and dispenser when applicable).

5. Use a soft-bristle brush or sponge (NOT a wire
brush) to carefully clean the parts.

! Caution
! Warning
Disconnect electric power to the ice machine (and
dispenser if applicable) at the electric switch box
before proceeding.

! Caution

2. Remove all ice from the bin.
3. Remove the water curtain and the components you
want to clean or sanitize. See the following pages for
removal procedures for these parts.

! Warning
Wear rubber gloves and safety goggles (and/or face
shield) when handling Ice Machine Cleaner or
Sanitizer.
4. Soak the removed part(s) in a properly mixed
solution.
Solution Type
Cleaner
Sanitizer

4-6

Water
1 gal. (4 l)
4 gal. (15 l)

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.

Mixed With
16 oz (500 ml) cleaner
3 oz (90 ml) sanitizer

Do not immerse the water pump motor in the
cleaning or sanitizing solution.
6. Use the sanitizing solution and a sponge or cloth to
sanitize (wipe) the interior of the ice machine and
the entire inside of the bin/dispenser.
7. Thoroughly rinse all of the parts and surfaces with
clear water.
8. 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.
9. Turn on the water and electrical supply.

Part Number 80-1480-3

Section 4

Maintenance
2. Ice Thickness Probe

1. Water Curtain
A. Gently flex the curtain in the center and remove
it from the right side.

A. Compress the hinge pin on the top of the ice
thickness probe.

B. Slide the left pin out.
STEP 1

STEP 2

COMPRESS
HINGE PIN TO
REMOVE

SV3153
SV3135

Water Curtain Removal
Ice Thickness Probe Removal

B. Pivot the ice thickness probe to disengage one
pin then the other. The ice thickness probe can
be cleaned at this point without complete
removal. Follow Step C for complete removal.

! Warning
Disconnect the electric power to the ice machine at
the electric service switch box.
C. Disconnect the ice thickness control wiring from
the control board.

Part Number 80-1480-3

4-7

Maintenance

Section 4

3. Water Distribution Tube

! Warning
Removing the distribution tube while the water
pump is running will allow water to spray from ice
machine. Disconnect the electrical power to the ice
machine and dispenser at the electric service switch
box and turn off the water supply.

4. Water Trough
A. Depress tabs on right and left side of the water
trough.
B. Allow front of water trough to drop as you pull
forward to disengage the rear pins.

NOTE: Distribution tube thumbscrews are retained by orings to prevent loss. Loosen thumbscrews but do not
pull thumbscrews out of distribution tube.
A

B
DEPRESS TABS

Water Distribution Tube Removal
A. Remove outer half of distribution tube by
loosening the four (4) thumbscrews (o-rings
retain thumbscrews to distribution tube).
B. Pull inner half of water distribution tube forward
to release slip joint from water pump tubing
connection.

4-8

Part Number 80-1480-3

Section 4

Maintenance
Water Pump

Water Level Probe
1. Remove the water trough.

! Warning
! Warning
Disconnect the electrical power to the ice machine
at the electrical disconnect before proceeding.
2. The water level probe normally does not require
removal for cleaning. The probe can be wiped and
cleaned in place or proceed to step 3.
3. Pull the water level probe straight down to
disengage.

Disconnect the electric power to the ice machine at
the electric service switch box and turn off the water
supply before proceeding.
1. Empty the water trough.
A. Move the toggle switch from OFF to ICE.
B. Wait 45 seconds.
C. Place toggle switch in OFF position.

4. Lower the water level probe until the wiring
connector is visible. Disconnect the wire lead from
the water level probe.
5. Remove the water level probe from the ice machine.

WATER
PUMP

WATER
PUMP BASE

SV3091

Water Pump Removal
WATER LEVEL PROBE

SV3141

2. Remove the water trough.
3. The water pump normally does not require removal
for cleaning. The water pump base can be wiped
and cleaned in place or proceed to step 4.
4. Grasp pump and pull straight down on pump
assembly until water pump disengages and
electrical connector is visible.
5. Disconnect the electrical connector.
6. Remove the water pump assembly from ice
machine.
7. Do not soak the water pump in cleaner or sanitizer.
Wipe the pump and ice machine base clean.

Part Number 80-1480-3

4-9

Maintenance

Section 4

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.

Important
The plunger and the inside of the enclosing tube
must be completely dry before assembly.
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.

A. If the dump valve is leaking, remove,
disassemble and clean it.

6. Remove the tubing from the dump valve by twisting
the clamps off.

B. If the dump valve is not leaking, do not remove
it. Instead, follow the “Ice Machine Cleaning
Procedure”.

7. Remove the two screws securing the dump valve
and the mounting bracket.

Follow the procedure below to remove the dump valve.
CAP

PLUNGER
SPRING STOP

! Warning
Disconnect the electric power to the ice machine at
the electric service switch box and turn off the water
supply before proceeding.

COIL

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.

SPRING

PLUNGER

ENCLOSING
TUBE

DIAPHRAM

VALVE BODY

Dump Valve Disassembly

NOTE: At this point, the water dump valve can easily be
cleaned. If complete removal is desired, continue with
step 5.

4-10

Part Number 80-1480-3

Section 4
Evaporator Tray Removal
1. Remove the water trough.
2. Remove thumbscrew on left side of tray.

Maintenance
Drain Line Check Valve
The drain line check valve normally does not require
removal for cleaning. Water loss from the sump trough
will indicate removal and cleaning are required.

3. Allow left side of tray to drop as you pull the tray to
the left side. Continue until the outlet tube
disengages from the right side.

sv3154

1. Remove check valve and tube assembly.
A. Tip assembly to right until tubing disengages.
B. Lift up on assembly to remove.
2. Remove insulation from check valve assembly.
3. Remove vinyl tubing from top of check valve.
4. Soak in cleaner solution 10 minutes, and then flush
with water to remove debris.

Part Number 80-1480-3

4-11

Maintenance

Section 4

Water Inlet Valve

Removing the Front Panels

The water inlet valve normally does not require removal
for cleaning. Refer to Section 5 for a list of causes for
“No Water Entering Water Trough” or “Water Overflows
Water Trough.

NOTE: The front panels do not normally have to be
removed. If needed perform the following procedure.

1. When the ice machine is off, the water inlet valve
must completely stop water flow into the machine.
2. 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, refer to Section 5.
Follow the procedure below to remove the water inlet
valve.

1. Loosen screws. Do not remove they are retained by
o-rings to prevent loss.
2. 30 Inch and 48 Inch Models Only: To remove right
front door lift up and remove (22 inch machines have
a single door, proceed to step 3).

! Warning

Disconnect the electric power to the ice machine
and dispenser at the electric service switch box and
turn off the water supply before proceeding.
1. Remove the 1/4” hex head screws.
2. Remove, clean, and install the filter screen.

2
FILTER
ACCESS
SCREWS

Door Removal
3. Open left front door to 45 degrees.
WATER
INLET
VALVE

4. Support with left hand, depress top pin, tilt top of
door forward and lift out of bottom pin to remove.

SV1622

4-12

Part Number 80-1480-3

Section 4

Maintenance

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.

! Caution

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.

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.
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.
SV1624

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.

Part Number 80-1480-3

4-13

Maintenance

Section 4

THIS PAGE INTENTIONALLY LEFT BLANK

4-14

Part Number 80-1480-3

Section 5

Before Calling For Service

Section 5
Before Calling For Service
Checklist
If a problem arises during operation of your ice machine, follow the checklist below before calling service. Routine
adjustments and maintenance procedures are not covered by the warranty.
Problem
Ice machine does not operate.

Ice machine stops, and can be restarted
by moving the toggle switch to OFF and
back to ICE.
Ice machine does not release ice or is
slow to harvest.

Ice machine does not cycle into harvest
mode.

Possible Cause
No electrical power to the ice machine
and/or condensing unit.
High pressure cutout tripping.
ICE/OFF/CLEAN toggle switch set
improperly.
Water curtain stuck open.
Remote receiver service valve and/or
Liquid/suction line shut off valves are
closed.
Safety limit feature stopping the ice
machine.
Ice machine is dirty.
Ice machine is not level.
Low air temperature around ice machine
head section.
Fan cycling control does not de-energize
condenser fan motor.
The six-minute freeze time lock-in has
not expired yet.
Ice thickness probe is dirty.
Ice thickness probe is disconnected.
Ice thickness probe is out of adjustment.
Uneven ice fill (thin at the top of
evaporator).

Ice quality is poor (soft or not clear).

Poor incoming water quality.

Water filtration is poor.
Ice machine is dirty.
Water dump valve is not working.
Water softener is working improperly (if
applicable).

Part Number 80-1480-3

To Correct
Replace the fuse/reset the breaker/turn
on the main switch.
Clean condenser coil. (See Section 4)
Move the toggle switch to the ICE
position.
Water curtain must be installed and
swinging freely. (See Section 4)
Open the valve(s). (See Section 2)

Refer to “Safety Limit Feature” on the
next page.
Clean and sanitize the ice machine.
(See Section 4)
Level the ice machine. (See Section 2)
Air temperature must be at least 35°F
(1.6°C).
Verify pressure is below cut-out setpoint,
replace fan cycling control.
Wait for the freeze lock-in to expire.
Clean and sanitize the ice machine.
(See Section 4)
Connect the wire.
Adjust the ice thickness probe.
(See Section 3)
Verify sufficient water level in sump
trough. Contact a qualified service
company to check refrigeration system.
Contact a qualified service company to
test the quality of the incoming water and
make appropriate filter
recommendations.
Replace the filter.
Clean and sanitize the ice machine.
(See Section 4)
Disassemble and clean the water dump
valve. (See Section 4)
Repair the water softener.

5-1

Before Calling For Service

Problem
Ice machine produces shallow or
incomplete cubes, or the ice fill pattern on
the evaporator is incomplete.

Low ice capacity.

Section 5

Possible Cause
Ice thickness probe is out of adjustment.

To Correct
Adjust the ice thickness probe.
(See Section 4)
Water trough level is too low.
Check the water level probe for damage.
(See Section 3)
Water inlet valve filter screen is dirty.
Remove the water inlet valve and clean
the filter screen. (See Section 4)
Water filtration is poor.
Replace the filter.
Hot incoming water.
Connect the ice machine to a cold water
supply. (See Section 2)
Water inlet valve is not working.
Replace the water inlet valve.
Incorrect incoming water pressure.
Water pressure must be 20-80 psi
(1.4 bar - 5.5 bar)
Ice machine is not level.
Level the ice machine.
(See Section 2)
Water inlet valve filter screen is dirty.
Remove the water inlet valve and clean
the filter screen. (See Section 4)
Incoming water supply is shut off.
Open the water service valve.
Water inlet valve stuck open or leaking.
Place toggle switch in OFF position, if
water continues to enter water trough
replace the water inlet valve.
The condenser is dirty.
Clean the condenser. (See Section 4)
High air temperature entering condenser. Air temperature must not exceed 120°F

(39°C)

Safety Limit Feature
In addition to the standard safety controls, such as the
high pressure cutout, your Manitowoc ice machine
features built-in safety limits which will stop the ice
machine if conditions arise which could cause a major
component failure.
Before calling for service, re-start the ice machine using
the following procedure:

1. Move the ICE/OFF/CLEAN switch to OFF and then
back to ICE.
A. If the safety limit feature has stopped the ice
machine, it will restart after a short delay.
Proceed to step 2.
B. If the ice machine does not restart, see “Ice
machine does not operate” on the previous
page.
2. Allow the ice machine to run to determine if the
condition is recurring.
A. If the ice machine stops again, the condition has
recurred. Call for service.
B. If the ice machine continues to run, the condition
has corrected itself. Allow the ice machine to
continue running.

5-2

Part Number 80-1480-3

Section 5

Before Calling For Service

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 80-1480-3

5-3

Before Calling For Service

Section 5

THIS PAGE INTENTIONALLY LEFT BLANK

5-4

Part Number 80-1480-3

Section 6

Electrical System

Section 6
Electrical System
Energized Parts Charts
SELF-CONTAINED AIR- AND WATER-COOLED MODELS
Control Board Relays
Ice Making
Sequence Of
Operation

START-UP 1
1. Water Purge

2. Refrigeration
System Start-Up
FREEZE
SEQUENCE
3. Pre-Chill

4. Freeze

Water
Pump

Harvest
Valve
(Left)

Harvest
Valve
(Right)*

On
(when
used)

Off

Air
Comp.*

Water
Inlet
Valve

Dump
Valve

Off

6. Harvest

Off

Contactor
Coil

Comp.

Cond.
Fan
Motor

Off

45 Seconds

Off

5 Seconds

May Cycle
On/Off

Initial Start-Up
is 60 Seconds
30 Seconds
thereafter

Length
Of Time

10 sec.
On

On; after
35 sec.

Off

35 sec.
Off

HARVEST
SEQUENCE
5. Water Purge

7. AUTOMATIC
SHUT-OFF

Contactor

Off

May
Cycle
On/Off
during
the first
45 sec.

Off

May Cycle
On/Off

Until 10 sec.
water contact
with ice
thickness
probe

30 sec.
Off,
15 sec.
On

May Cycle
On/Off

Factory-set at
45 Seconds

Off

May Cycle
On/Off

Bin switch
activation

Off

Until bin
switch
re-closes &
3 min. delay

Cycles
Off, then
On one
more
time

Off

1. Initial Start-Up or Start-Up After Automatic Shut-Off
* Not Used on all Models

Condenser Fan Motor
The fan motor is wired through a fan cycle pressure control, therefore,
it may cycle on and off.

Safety Timers
The control board has the following non-adjustable safety timers:
•

The ice machine is locked into the freeze cycle for 6 minutes,
before a harvest sequence can be initiated. The freeze lock is
bypassed when the toggle switch is moved from the OFF to ICE
position on the first cycle only.

•

The maximum freeze time is 60 minutes, at which time the control
board automatically initiates a harvest sequence (steps 5-6).

•

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).

Harvest Water Purge
The circuit board has an adjustable water purge in the harvest cycle.
This permits a 0 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.

Part Number 80-1480-3

6-1

Electrical System

Section 6

REMOTE MODELS
Control Board Relays
Ice Making
Sequence Of
Operation

Water
Pump

Harvest
Valve
(Left)
HPR
Valve

Harvest
Valve
(Right)*

Air
Comp.*

Water
Inlet
Valve

Dump
Valve

Off

START-UP 1
1. Water Purge

35 sec.
Off
10 sec.
On

2. Refrigeration
System
Start-Up

Off

FREEZE
SEQUENCE
3. Pre-Chill

4. Freeze

Contactor

Off

May
Cycle
On/Off
during
first
45 sec.

Contactor
Coil
Liquid Line
Solenoid

Comp.

Cond.
Fan
Motor

Off

45 Seconds

Off

5 Seconds

Initial StartUp is 60
Seconds
30 Seconds
thereafter

Off

Length
Of Time

Off

Until 10 sec.
water
contact with
ice
thickness
probe

30 sec.
Off,
15 sec.
On

Factory-set
at 45
Seconds

Cycles
Off then
On one
more
time

HARVEST
SEQUENCE
5. Water Purge

On; after
35 sec.

6. Harvest

Off

Bin switch
activation

7. AUTOMATIC
SHUT-OFF

Off

Until bin
switch recloses

1. Initial Start-Up or Start-Up After Automatic Shut-Off
*Not used on all models

Auto Shut-Off

Safety Timers

The ice machine remains off for 3 minutes before it can
automatically restart. The ice machine restarts (steps 12) immediately after the delay period, if the bin switch recloses prior to 3 minutes.

The control board has the following non-adjustable
safety timers:
•

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 freeze lock
is bypassed when the toggle switch is moved from
the OFF to ICE position on the first cycle only.

•

The maximum freeze time is 60 minutes, at which
time the control board automatically initiates a
harvest sequence (steps 5-6).

•

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).

Harvest Water Purge
The circuit board has an adjustable water purge in the
harvest cycle. This permits a 0 or 45 second purge
cycle.

6-2

Part Number 80-1480-3

Section 6
Wiring Diagram Sequence of
Operation

Electrical System

L2 or N

L1
Ground

SELF-CONTAINED MODELS
Initial Start-Up or Start-Up After
Automatic Shut-Off

(89)

(20)

(55)
(61)

High
Pressure
Cutout
(88)

The harvest valve(s) is also
energized during the water purge. In
the case of an initial refrigeration
start-up or auto shut-off, it stays on
for an additional
5 seconds (50 seconds total).

(42)

(99)

(22)

Control Board
(2)
(6)
(5)
(1)
(7)
(4)

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.

Water Valve
(21)
Harvest Valve
(77)

(60)

(80)
Dump Valve

(75)

(76)
(81)
Water Pump
(98)

(57)

Trans.
(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Contactor Coil

(25)

(56)
Air Compressor
(26)

Ice Thickness
Probe

(9)

Water Level Probe

(8)

Low DC
Voltage
Plug

Bin Switch

(74)

(6)
Clean
OFF
ICE

(1)
(2)

(Red)
Compressor

When Used - The air compressor
energizes for the last 10 seconds of
the cycle.

Contactor
Contacts
(Black)
L1
(51)

Overload

(Yellow)

Run Capacitor

(46)

(50)
(45)

(85)

(86)

PTCR
Fan Motor

Fan Cycle
Control
Run Capacitor

SV3137-2

Self-Contained — Water Purge
Table 6-1. Self-Contained Models
1. Water Purge (45 Seconds)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left)
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

Part Number 80-1480-3

ICE
Closed
ON
ON
ON (When Used)
35 sec. OFF / 10 sec. ON
OFF
ON
Open / OFF
OFF
OFF
Closed
Closed

6-3

Electrical System
2. REFRIGERATION SYSTEM
START-UP
The compressor starts after the 45second water purge, and it remains
on throughout the Freeze and
Harvest cycles.

Section 6
L2 or N

L1
Ground
(89)

(20)

(55)
(61)

High
Pressure
Cutout
(88)

(42)

Harvest Valve
(77)
(80)
Dump Valve
(76)
(81)

(60)

(75)

Water Pump

(57)

(98)

Trans.

The harvest valve(s) remains on for
the first 5 seconds of the initial
compressor start-up and then shuts
off.

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, the
compressor and fan motor are
supplied with power.)

(99)

(22)

Control Board
(2)
(6)
(5)
(1)
(7)
(4)

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

At the same time the compressor
starts, the condenser fan motor (aircooled models) is supplied with
power throughout the entire freeze
and harvest sequences.

Water Valve
(21)

(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Contactor Coil

(25)

(56)
Air Compressor

(26)
Ice Thickness
Probe

(9)

Water Level Probe

(8)

Low DC
Voltage
Plug

(6)
Clean
OFF
ICE

(1)
(2)

(Red)
Compressor
Contactor
Contacts
(Black)
L1
(51)

Overload

(74)

Bin Switch

(Yellow)

(46)

Run Capacitor
(50)
(45)

(85)

(86)

PTCR
Fan Motor

Fan Cycle
Control
Run Capacitor

SV3137-4

Self-Contained — Refrigeration System Start-Up
Table 6-2. Self-Contained Models
2. Refrigeration System Start Up (5 Seconds)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left)
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

6-4

ICE
Closed
OFF
ON
ON (When Used)
ON (When Used)
ON
OFF
Closed / ON
ON
OFF
Closed
Closed

Part Number 80-1480-3

Section 6

Electrical System

Freeze Sequence

L2 or N

3. PRE-CHILL

Ground

To pre-chill the evaporator, the
compressor runs for 30 seconds (60
seconds initial cycle) prior to water
flow.

(89)

Water Valve
(21)
(22)

(20)

(55)
(61)

High
Pressure
Cutout
(88)

Control Board
(2)
(6)
(5)
(1)
(7)
(4)

The water fill valve remains on until
the water level probe is satisfied.
(42)

(99)

Harvest Valve
(77)
(80)
Dump Valve
(76)
(81)

(60)

(75)

Water Pump

(57)

(98)

Trans.
(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Contactor Coil

(25)

(56)
Air Compressor

(26)
Ice Thickness
Probe

(9)

Water Level Probe

(8)

Low DC
Voltage
Plug

(74)

Bin Switch
(6)
Clean
OFF
ICE

(1)
(2)

(Red)
Compressor
Overload

Contactor
Contacts

(Yellow)

(46)

Run Capacitor
(50)

(Black)
(45)

L1
(51)

(85)

(86)

PTCR
Fan Motor

Fan Cycle
Control
Run Capacitor

SV3137-3

Self-Contained — Pre-Chill
Table 6-3. Self-Contained Models
3. Pre-Chill (60 Seconds Initial Cycle - 30 Seconds thereafter)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left)
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

Part Number 80-1480-3

ICE
Closed
OFF
OFF
OFF (When Used)
OFF (When Used)
On
OFF
Closed / ON
ON
May Cycle ON / OFF
Closed
Closed

6-5

Electrical System
4. FREEZE
The water pump starts after the prechill. An even flow of water is directed
across the evaporator and into each
cube cell, where it freezes.

Section 6
L2 or N

L1
Ground
(89)

(20)

(55)
(61)

High
Pressure
Cutout
(88)

Control Board
(2)
(6)
(5)
(1)
(7)
(4)

The water fill valve will cycle off then
on one more time to refill the water
trough.
(42)

When sufficient ice has formed, the
water flow (not the ice) contacts the
ice thickness probes. After
approximately 10 seconds of
continual contact, a harvest cycle is
initiated.
NOTE: The ice machine cannot
initiate a harvest cycle until a 6minute freeze lock has expired.

Water Valve
(21)
(22)

(99)

Harvest Valve
(77)
(80)
Dump Valve
(76)
(81)

(60)

(75)

Water Pump

(57)

(98)

Trans.
(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Contactor Coil

(25)

(56)
Air Compressor

(26)
Ice Thickness
Probe

(9)

Water Level Probe

(8)

Low DC
Voltage
Plug

(74)

Bin Switch
(6)
Clean
OFF
ICE

(1)
(2)

(Red)
Compressor
Contactor
Contacts
(Black)
L1
(51)

Overload

(Yellow)

(46)

Run Capacitor
(50)
(45)

(85)

(86)

PTCR
Fan Motor

Fan Cycle
Control
Run Capacitor

SV3137-5

Self-Contained — Freeze
Table 6-4. Self-Contained Models
4. Freeze (Until 10 Seconds of Water Contact with Ice Thickness Probe)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left)
#3
Harvest Valve (Right)
#4
Air Compressor
#5

Water Inlet Valve

#6
Water Dump Valve
#7
Contactor Coil
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

6-6

ICE
Closed
ON
OFF
OFF (When Used)
OFF (When Used)
Cycles OFF, then ON
one more time
OFF
Closed / ON
ON
May Cycle ON / OFF
Closed
Closed

Part Number 80-1480-3

Section 6

Electrical System

Harvest Sequence

L2 or N

5. WATER PURGE

Ground

The harvest valve(s) opens at the
beginning of the water purge to divert
hot refrigerant gas into the
evaporator.

(89)

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 and de-energizes strictly
by time. The water fill valve energizes
for the last 15 seconds of the 45second water purge.
After the 45 second water purge, the
water fill valve, water pump and
dump valve de-energize. (Refer to
“Water Purge Adjustment” for
details.)
The air compressor (when used) will
energize after 35 seconds.

Water Valve
(21)
(22)

(20)

(55)
(61)

High
Pressure
Cutout
(88)

Control Board
(2)
(6)
(5)
(1)
(7)
(4)

(42)

(99)

Harvest Valve
(77)
(80)

(60)

Dump Valve
(76)
(81)

(75)

Water Pump

(57)

(98)

Trans.
(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Contactor Coil

(25)

(56)
Air Compressor

(26)
Ice Thickness
Probe

(9)

Water Level Probe

(8)

Low DC
Voltage
Plug

(74)

Bin Switch
(6)
Clean
OFF
ICE

(1)
(2)

(Red)
Compressor
Contactor
Contacts
(Black)
L1
(51)

(Yellow)

Overload

Run Capacitor

(46)

(50)
(45)

(85)

(86)

PTCR
Fan Motor

Fan Cycle
Control
Run Capacitor

SV3137-6

Self-Contained — Water Purge
Table 6-5. Self-Contained Models
5. Water Purge (45 Seconds)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left)
#3
Harvest Valve (Right)
#4
Air Compressor
#5

Water Inlet Valve

#6
Water Dump Valve
#7
Contactor Coil
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

Part Number 80-1480-3

ICE
Closed
ON
ON
ON (When Used)
ON; after 35 seconds
30 seconds OFF,
15 seconds ON
ON
Closed / ON
ON
OFF; May Cycle ON
Closed
Closed

6-7

Electrical System
6. HARVEST
The harvest valve(s) remains open
and the refrigerant gas warms 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).

Section 6

L2 or N

L1
Ground
(89)

Water Valve
(21)
(22)

(20)

(55)
(61)

High
Pressure
Cutout
(88)

Control Board
(2)
(6)
(5)
(1)
(7)
(4)

(42)

Harvest Valve
(77)
(80)

(60)

Dump Valve
(76)
(81)

(75)

Water Pump

(57)

(98)

Trans.
(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Contactor Coil

(25)

(56)
Air Compressor

(26)

The air compressor (when used)
remains energized throughout the
entire harvest cycle. The air
compressor will automatically
energize after 60 seconds when the
harvest cycle time exceeded 75
seconds in the previous cycle.

(99)

Ice Thickness
Probe

(9)

Water Level Probe

(8)

Low DC
Voltage
Plug

(74)

Bin Switch
(6)
Clean
OFF
ICE

(1)
(2)

(Red)
Compressor
Contactor
Contacts
(Black)
L1
(51)

Overload

(Yellow)

(46)

Run Capacitor
(50)
(45)

(85)

(86)

PTCR
Fan Motor

Fan Cycle
Control
Run Capacitor

SV3137-7

Table 6-6. Self-Contained Models
6. Harvest (Until Bin Switch Activation)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left)
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

6-8

ICE
Closed
OFF
ON
ON (When Used)
ON (When Used)
OFF
OFF
Closed / ON
ON
OFF; May Cycle ON
Closed
Closed

Part Number 80-1480-3

Section 6

Electrical System

Automatic Shut-Off
7. AUTOMATIC SHUT-OFF

L2 or N

L1
Ground

When 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 30 seconds,
the ice machine shuts off.

(89)

(20)

(55)
(61)

High
Pressure
Cutout
(88)

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), provided the 3
minute delay period is complete.

Water Valve
(21)
(22)

Control Board
(2)
(6)
(5)
(1)
(7)
(4)

(42)

(99)

Harvest Valve
(77)
(80)
Dump Valve
(76)
(81)

(60)

(75)

Water Pump

(57)

(98)

Trans.
(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Contactor Coil

(25)

(56)
Air Compressor

(26)
Ice Thickness
Probe

(9)

Water Level Probe

(8)

Low DC
Voltage
Plug

NOTE: The ice machine must remain
off for 3 minutes before it can
automatically restart.

(74)

Bin Switch
(6)
Clean
OFF
ICE

(1)
(2)

(Red)
Compressor
Contactor
Contacts
(Black)
L1
(51)

Overload

(Yellow)

(46)

Run Capacitor
(50)
(45)

(85)

(86)

PTCR
Fan Motor

Fan Cycle
Control
Run Capacitor

SV3137-1

Self-Contained — Automatic Shut-Off
Table 6-7. Self-Contained Models
7. Automatic Shut-Off (Until Bin Switch Closes)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left)
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

Part Number 80-1480-3

ICE
Open
OFF
OFF
OFF (When Used)
OFF (When Used)
OFF
OFF
Open / OFF
OFF
OFF
Closed
Closed

6-9

Electrical System

Section 6

THIS PAGE INTENTIONALLY LEFT BLANK

6-10

Part Number 80-1480-3

Section 6

Electrical System

REMOTE MODELS
Water Valve

Initial Start-Up Or Start-Up After
Automatic Shut-Off

(22)

Ground
(89)

(21)

(20)

(L1)

(88)

HPR Valve
(78)

(55)

(61)

(79)
(77)

Control Board

High Pressure
Cut-out

(2)
(6)
(5)
(1)

(60)

Harvest Valve
Dump Valve
(98)

(57)
(58)

(99)

(83)

Fuse 7A

(22)
(59)
L2

Liquid Line
Solenoid

(75)

Contactor Coil

(56)
(25)
Ice Thickness
Probe

(81)

Water Pump

Trans
(42)

(80)

(76)

(7)
(4)

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 or auto
shut-off, they stay on for an additional
5 seconds (50 seconds total).

(L2)
(82)

(26)

Air Compressor

(9)
(8)

Bin Switch

Low DC
Voltage
Plug

Water Level
Probe

(74)

(6)
Clean
OFF
ON

(1)
(2)

Red

Contactor
Contacts

Compressor

Run
Cap.

Yellow
(46)

(50)

Black
(L1)

(45)
(51)

(F1)

PTCR
(F2)
Remote Fan Motor
Remote
Condenser
Run Capacitor

SV3158-1

Remote - Water Purge
Table 6-8. Remote Models
1. Water Purge (45 Seconds)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left) / HPR Valve
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil / Liquid Line Solenoid
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

Part Number 80-1480-3

ICE
Closed
ON
ON
ON (When Used)
35 sec. OFF / 10 sec. ON
OFF
ON
Open / OFF
OFF
OFF
Closed
Closed

6-11

Electrical System

Section 6

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.

Water Valve
(21)

(20)

(L1)

(22)

Ground
(89)

(88)

(78)

(55)

(61)

(79)
(77)

Control Board

High Pressure
Cut-out

(2)
(6)
(5)
(1)

(60)

Harvest Valve
Dump Valve
(98)

(57)
(58)

(99)

(83)

Fuse 7A

Liquid Line
Solenoid

(59)
L2

(22)
(75)

Contactor Coil

(56)
(25)
Ice Thickness
Probe

(81)

Water Pump

Trans
(42)

(80)

(76)

(7)
(4)

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.)

(L2)
(82)

HPR Valve

(26)

Air Compressor

(9)
(8)

Bin Switch

Low DC
Voltage
Plug

Water Level
Probe

(74)

(6)
(1)
(2)

Clean
OFF
ON

Red

Contactor
Contacts

Compressor

Run
Cap.

Yellow
(46)

(50)

Black
(L1)

(45)
(51)

(F1)

PTCR
(F2)
Remote Fan Motor
Remote
Condenser
Run Capacitor

Table 6-9. Remote Models

Remote — Refrigeration System Start-Up

2. Refrigeration System Start Up (5 Seconds)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left) / HPR Valve
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil / Liquid Line Solenoid
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

6-12

SV3158-2

ICE
Closed
OFF
ON
ON (When Used)
ON (When Used)
ON
OFF
Closed / ON
ON
ON
Closed
Closed

Part Number 80-1480-3

Section 6

Electrical System

Freeze Sequence
3. PRE-CHILL
To pre-chill the evaporator, the
compressor runs for 30 seconds (60
seconds initial cycle) prior to water
flow.

Water Valve
(21)

(20)

(L1)

(22)

Ground
(89)

(88)

(L2)
(82)

HPR Valve
(78)

(55)

(61)

(79)
(77)

Control Board

High Pressure
Cut-out

(2)
(6)
(5)
(1)

NOTE: The water fill valve remains
on until the water level probe is
satisfied.

(60)
(76)

(7)
(4)

Dump Valve
(98)

(57)
(58)

(99)

(83)

Fuse 7A

(22)
(59)
L2

(25)

Liquid Line
Solenoid

(75)

Contactor Coil

(56)

Ice Thickness
Probe

(81)

Water Pump

Trans
(42)

(80)

Harvest Valve

(26)

Air Compressor

(9)
(8)

Bin Switch

Low DC
Voltage
Plug

Water Level
Probe

(74)

(6)
Clean
OFF
ON

(1)
(2)

Red

Contactor
Contacts

Compressor

Run
Cap.

Yellow
(46)

(50)

Black
(L1)

(45)
(51)

(F1)

PTCR
(F2)
Remote Fan Motor
Remote
Condenser
Run Capacitor

SV3158-3

Remote — Pre-Chill
Table 6-10. Remote Models
3. Pre-Chill (60 Seconds Initial Cycle - 30 Seconds thereafter)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left) / HPR Valve
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil / Liquid Line Solenoid
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

Part Number 80-1480-3

ICE
Closed
OFF
OFF
OFF (When Used)
OFF (When Used
ON
OFF
Closed / ON
ON
May Cycle ON / OFF
Closed
Closed

6-13

Electrical System

Section 6

4. FREEZE
The water pump starts after the 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 off then
on one more time to refill the water
trough.
When sufficient ice has formed, the
water flow (not the ice) contacts the
ice thickness probes. After
approximately 10 seconds of
continual contact, a harvest cycle is
initiated.

Water Valve
(21)

(20)

(L1)
Ground
(89)

(88)

(L2)
(82)

HPR Valve
(78)

(55)

(61)

(79)
(77)

Control Board

High Pressure
Cut-out

(2)
(6)
(5)
(1)

(76)
Dump Valve
(98)

(57)

Trans
(42)

(80)

Harvest Valve

(60)

(7)
(4)

(81)
(99)

Water Pump
(83)

(58)

Fuse 7A
(59)
L2

(25)
Ice Thickness
Probe

Liquid Line
Solenoid

(22)
(75)

Contactor Coil

(56)

NOTE: The ice machine cannot
initiate a harvest cycle until a 6minute freeze lock has expired.

(22)

(26)

Air Compressor

(9)

Water Level
Probe

Bin Switch

(8)

Low DC
Voltage
Plug

(74)

(6)
Clean
OFF
ON

(1)
(2)
Red

Contactor
Contacts

Compressor

Run
Cap.
Yellow
(46)

(50)

Black
(L1)

(45)
(51)

(F1)

PTCR
(F2)
Remote Fan Motor
Remote
Condenser
Run Capacitor

Table 6-11. Remote Models

Remote — Freeze

4. Freeze (Until 10 Seconds of Water Contact with Ice Thickness Probe)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left) / HPR Valve
#3
Harvest Valve (Right)
#4
Air Compressor
#5

Water Inlet Valve

#6
Water Dump Valve
#7
Contactor Coil / Liquid Line Solenoid
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

6-14

SV3158-4

ICE
Closed
ON
OFF
OFF (When Used)
OFF (When Used)
Cycles OFF, then ON
one more time
OFF
Closed / ON
ON
ON
Closed
Closed

Part Number 80-1480-3

Section 6

Electrical System

Harvest Sequence
5. WATER PURGE
The harvest valve and HPR solenoid
also open at the beginning of the
water purge to divert hot refrigerant
gas into the evaporator.
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 deenergizes (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”
for details.)

Water Valve
(21)

(20)

(L1)
Ground
(89)

(88)

(22)

(L2)
(82)

HPR Valve
(78)

(55)

(61)

(79)
(77)

Control Board

High Pressure
Cut-out

(2)
(6)
(5)
(1)

Harvest Valve

(60)
(76)

(7)
(4)

Dump Valve
(98)

(57)

Trans
(42)

(80)

(81)
(99)

Water Pump
(83)

(58)

Fuse 7A
(59)
L2

Ice Thickness
Probe

(22)
(75)

Contactor Coil

(56)
(25)

Liquid Line
Solenoid

(26)

Air Compressor

(9)

Water Level
Probe

Bin Switch

(8)

Low DC
Voltage
Plug

(74)

(6)
(1)
(2)

Clean
OFF
ON

Red

Contactor
Contacts

Compressor

Run
Cap.
Yellow
(46)

(50)

Black
(L1)

(45)
(51)

(F1)

PTCR
(F2)
Remote Fan Motor
Remote
Condenser
Run Capacitor

SV3158-5
SV3158-6

Remote — Water Purge
Table 6-12. Remote Models
5. Water Purge (45 Seconds)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left) / HPR Valve
#3
Harvest Valve (Right)
#4
Air Compressor
#5

Water Inlet Valve

Part Number 80-1480-3

ICE
Closed
ON
ON
ON (When Used)
ON; after 35 seconds
30 seconds OFF,
15 seconds ON
ON
Closed / ON
ON
ON
Closed
Closed

6-15

Electrical System

Section 6

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).

Water Valve
(21)

(20)

(L1)
Ground
(89)

(88)

(L2)
(82)

HPR Valve
(78)

(55)

(61)

(79)
(77)

Control Board

High Pressure
Cut-out

(2)
(6)
(5)
(1)

(76)
Dump Valve
(98)

(57)

Trans
(42)

(80)

Harvest Valve

(60)

(7)
(4)

(81)
(99)

Water Pump
(83)

(58)

Fuse 7A
(59)
L2

(25)
Ice Thickness
Probe

Liquid Line
Solenoid

(22)
(75)

Contactor Coil

(56)

The air compressor (when used)
energizes after 35 seconds into the
harvest cycle. The air compressor
will automatically energize after 60
seconds when the harvest cycle time
exceeded 75 seconds in the previous
cycle.

(22)

(26)

Air Compressor

(9)

Water Level
Probe

Bin Switch

(8)

Low DC
Voltage
Plug

(74)

(6)
Clean
OFF
ON

(1)
(2)
Red

Contactor
Contacts

Compressor

Run
Cap.
Yellow
(46)

(50)

Black
(L1)

(45)
(51)

(F1)

PTCR
(F2)
Remote Fan Motor
Remote
Condenser
Run Capacitor

Remote — Harvest
Table 6-13. Remote Models
6. Harvest (Until Bin Switch Activation)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left) / HPR Valve
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil / Liquid Line Solenoid
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

6-16

ICE
Closed
OFF
ON
ON (When Used)
ON (When Used)
OFF
OFF
Closed / ON
ON
ON
Closed
Closed

Part Number 80-1480-3

Section 6

Electrical System

Automatic Shut-Off
7. AUTOMATIC SHUT-OFF

Water Valve
(20)

(L1)

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 30 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.

(21)

Ground
(89)

(88)

(L2)
(82)

HPR Valve
(78)

(55)

(61)

(79)
(77)

Control Board

High Pressure
Cut-out

(2)
(6)
(5)
(1)

(76)
Dump Valve
(98)

(57)

Trans
(42)

(80)

Harvest Valve

(60)

(7)
(4)

(81)
(99)

Water Pump
(83)

(58)

Fuse 7A
(59)
L2
(56)
(25)
Ice Thickness
Probe

NOTE: The ice machine must remain
off for 3 minutes before it can
automatically restart.

(22)

(26)

Liquid Line
Solenoid

(22)
(75)

Contactor Coil

Air Compressor

(9)
(8)

Low DC
Voltage
Plug

Water Level
Probe

(74)

Bin Switch
(6)
Clean
OFF
ON

(1)
(2)
Red

Contactor
Contacts

Compressor

Run
Cap.
Yellow
(46)

(50)

Black
(L1)

(45)
(51)

PTCR

(F1)

(F2)
Remote Fan Motor
Remote
Condenser
Run Capacitor

SV3158-7

Remote — Automatic Shut-Off
Table 6-14. Remote Models
7. Automatic Shut-Off (Until Bin Switch Closes)
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Harvest Valve (Left) / HPR Valve
#3
Harvest Valve (Right)
#4
Air Compressor
#5
Water Inlet Valve
#6
Water Dump Valve
#7
Contactor Coil / Liquid Line Solenoid
#7A
Compressor
#7B
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)

Part Number 80-1480-3

ICE
Open
OFF
OFF
OFF (When Used)
OFF (When Used)
OFF
OFF
Open / OFF
OFF
OFF
Closed
Closed

6-17

Electrical System

Section 6

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.

! Warning
Always disconnect power before working on electrical circuitry.
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)

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)

6-18

Part Number 80-1480-3

Section 6

Electrical System

S320 SELF CONTAINED- 1 PHASE
SEE SERIAL PLATE FOR VOLTAGE
L2 OR N
L1

(21)

(20)
GROUND

WATER
VALVE

(61)

(22)

CONTROL BOARD
(55)

(89)

(2)
(60)

(6)
HIGH PRESSURE
CUTOUT

HARVEST
SOLENOID

(5)

(80)
(75)

(76)

(1)

(88)

(99)

(77)

DUMP
SOLENOID

(7)
(57)

(4)

(81)

(98)
TRANS.

WATER
PUMP

FUSE (7A)

CLEAN
LEFT BIN
RIGHT BIN
RMT BIN
WTR PROBE
ICE PROBE
HARV
SL-1
SL-2

(42)

ICE THICKNESS
PROBE

(58)
(59)

CONTACTOR
COIL

(56)

(9)
(8)
(6)

LOW D.C.
VOLTAGE
PLUG

WATER LEVEL
PROBE

TERMINATES AT
PIN CONNECTION

(74)

BIN
SWITCH

CLEAN
(2)

(1)

OFF
ICE

START
CAPACITOR

C
S

L1
CONTACTOR
CONTACTS

(49)

14
CURRENT
RELAY

(51)
(48)

(85)

FAN CYCLE CONTROL

FAN MOTOR
(AIR COOLED ONLY)
RUN CAPACITOR**

Part Number 80-1480-3

6-19

Electrical System

Section 6

S300/S420/S450- SELF CONTAINED - 1 PHASE

Water Valve
L1

(20)
Ground

(21)

(61)

(22)

Control
Board
(89)

(55)

Harvest Valve
(77)

(2)
(60)

(6)
(88)

(80)

(5)

High Pressure
Cutout

Dump Valve
(75)

(76)

(1)
(7)

(81)

(4)

(57)
(98)

Water Pump
(99)

Trans.
(58)

Fuse (7a)

(59)

(42)

Ice Thickness
Probe

Contactor
Coil

(56)
(25)

Air Compressor
(When Used)

(26)

(74)
(9)

(8)

Bin Switch
(6)

Low DC
Voltage
Plug

Clean
OFF
ICE

(1)
(2)

Compressor
S

R
Contactor
Contacts

Terminates at
Pin Connection

Clean
Left Bin
Right Bin
Rmt Bin
Wtr Probe
Ice Probe
Harvest
SL-1
SL-2

Water Level Probe

(47)

Overload

Run
Capacitor
S

(53)
L1

(49)

(48)
5
(51)

L2 or N

(99)

(46)

(44)

1
(45)

(52)

R
C
Compressor
Terminal Layout
Viewed from End of
Compressor
(50)

(85)

(86)
Fan Motor

Fan Cycle
Control

6-20

Run Capacitor

Part Number 80-1480-3

Section 6

Electrical System

S500/S600/S850/S1000/S1200 - SELF CONTAINED - 1 PHASE

L2 or N
Ground

(99)

Water Valve
(20)
(89)

(21)

(55)

(22)

(61)

(88)

Control
Board
(2)

High Pressure
Cutout

Harvest Valve
(77)
(60)

(6)

(80)

(5)

Dump Valve
(76)

(1)
(7)

(75)
(81)
Water Pump

(4)
(98)

(57)

(99)

Trans.
Fuse (7a)

(58)
(59)

(42)

Clean
Left Bin
Right Bin
Rmt Bin
Wtr Probe
Ice Probe
Harvest
SL-1
SL-2
Ice Thickness
Probe

Contactor
Coil

(56)
(26)

Air Compressor
(When Used)

(25)

(74)
(9)

Water Level Probe

Terminates at
Pin Connection

Bin Switch

(8)
(6)

Low DC
Voltage
Plug

Clean
OFF
ICE

(1)
(2)
(Red)
Compressor

Run
Capacitor

(Yellow)

Contactor
Contacts

Overload
(50)

(46)

(Black)

(45)

L1
(51)

(85)

Fan Cycle
Control

(86)

PTCR
Fan Motor

Run Capacitor

Part Number 80-1480-3

SV3130

6-21

Electrical System

Section 6

S850/S1000/S1200 - SELF CONTAINED - 3 PHASE

(99)

Water Valve

Ground

(20)

(21)

(61)
(89)

(22)

Control
Board

(55)

Harvest Valve

High Pressure
Cutout

(77)
(80)

(60)

(6)

(88)

(5)

Dump Valve
(76)

(1)
(7)

(81)

(4)

Water Pump
(57)

(98)
(99)

Trans.
(58)

Fuse (7a)

Terminates at
Pin Connection
(59)

Clean
Left Bin
Right Bin
Rmt Bin
Wtr Probe
Ice Probe
Harvest
SL-1
SL-2

(42)

Ice Thickness
Probe

Air Compressor
(When Used)
(25)
(74)
(9)

(8)

Bin Switch
(6)

Low DC
Voltage
Plug

Water Level Probe

Contactor
Coil

(56)

(26)

(75)

(1)

Clean
OFF
ICE

(2)

(75)

L3 L2 L1

Contactor
Contacts
Fan Motor
(51)

(85)
Fan Cycle
Control

(86)

Run Capacitor

Compressor

SV3131

6-22

Part Number 80-1480-3

Section 6

Electrical System

S500/S600/S850/S1000 - REMOTE - 1 PHASE

Water Valve
L1

(22)

(21)

(20)

L2 or N

Ground
HPR Valve
(89)

(78)

(55)

(79)

(61)

(88)

Harvest Valve

Control
Board
(2)

High Pressure
Cutout

(82)

(77)
(80)

(60)

(6)

Dump Valve
(76)

(5)

(81)

(1)
(7)

Water Pump

(4)

(98)

(57)

(99)

Trans.
(83)
(58)

Fuse (7a)

Clean
Left Bin
Right Bin
Rmt Bin
Wtr Probe
Ice Probe
Harvest
SL-1
SL-2

(42)

Ice Thickness
Probe

Contactor
Coil

(56)

(75)

(26)
Air Compressor
(When Used)

(25)

(74)

(9)

(8)

Bin Switch

Low DC
Voltage
Plug

Water Level Probe

(22)

Liquid Line
Solenoid

(59)

(6)

Clean
OFF
ICE

(1)
(2)
(Red)
Compressor

Run
Capacitor

(Yellow)

Contactor
Contacts

Overload

(50)
R

(46)

(Black)
(45)

L1
(51)

(F1)

PTCR

(F2)

Remote Condenser
Fan Motor

Run Capacitor
SV3158

Part Number 80-1480-3

6-23

Electrical System

Section 6

S850/S1000 - REMOTE - 3 PHASE
Water Valve
L3

(22)

(21)

(20)
L1
Ground

HPR Valve

(89)

(55)

(78)

(61)

(77)
(80)

(2)
(6)

(88)

(79)
Harvest Valve

Control
Board

High Pressure
Cutout

(82)

(60)

Dump Valve
(76)

(5)

(81)

(1)
(7)

Water Pump
(98)

(57)

(4)

(99)
(82)

Liquid Solenoid
(83)

Trans.
(58)
Fuse (7a)

(22)

(75)

(59)
L2

Clean
Left Bin
Right Bin
Rmt Bin
Wtr Probe
Ice Probe
Harvest
SL-1
SL-2

(42)

Ice Thickness
Probe

Contactor Coil
(56)
(26)

(74)
(9)

(8)

Bin Switch

Low DC
Voltage
Plug

Water Level Probe

(6)

(2)
(74)

Air Compressor
(When Used)

(25)

(1)

Clean
OFF
ICE
(75)

(75)
L3 L2 L1

Contactor
Contacts
F1
(51)

Fan Motor

Compressor

Run Capacitor

SV3159

6-24

Part Number 80-1480-3

Section 6

Electrical System

S1400/S1600/S1800 - SELF-CONTAINED - 1 PHASE
WATER
VALVE

L2 OR N

(21)

(20)

(22)
(89)

(55)

LH HARVEST
(77) SOLENOID

(61)

(87)

CONTROL BOARD

HIGH PRESSURE
CUTOUT

(88)

(2)

(6)

(88)

(99)

RH HARVEST
SOLENOID

(60)

(80)

(5)
(76)

(1)
(57)

(4)

(81)

DUMP
SOLENOID

(7)
(98)

WATER
PUMP

TRANS.
FUSE (7A)

(58)

TERMINATES AT
PIN CONNECTION
(59)

CLEAN
LEFT BIN
RIGHT BIN
RMT BIN
WTR PROBE
ICE PROBE
HARVEST
SL-1
SL-2

(42)

ICE THICKNESS
PROBE

AIR
COMP

CONTACTOR
COIL

(56)
AIR

(26)

COMPRESSOR
WHEN USED

(25)
(9)

(74)
(8)

WATER LEVEL
PROBE

(75)

BIN
(6)

LOW D.C.
VOLTAGE
PLUG

SWITCH

CLEAN
OFF
ICE

(1)

(2)

(RED)
RUN

COMPRESSOR
R

CONTACTOR
CONTACTS

*OVERLOAD

(51)

(85)

(YELLOW)
(46)

(BLACK)
L1

CAPACITOR

PTCR
(86)

R
(50)

(45)

(44)
FAN MOTOR
(AIR COOLED ONLY)

FAN CYCLE
CONTROL

RUN CAPACITOR**

Part Number 80-1480-3

6-25

Electrical System

Section 6

S1400/S1600/S1800 - SELF-CONTAINED - 3 PHASE
WATER
VALVE
(21)

(20)

(22)
L3

LH HARVEST
SOLENOID
(77)

(61)

(87)

(55)

(89)

(99)

(88)

CONTROL BOARD
(2)

HIGH PRESSURE
CUTOUT

(6)

RH HARVEST
SOLENOID

(60)

(80)

(5)
(88)

(76)

(1)

DUMP
SOLENOID

(7)
(57)

(4)

(81)

(98)
WATER
PUMP

TRANS.
FUSE (7A)

(58)
(59)

CLEAN
LEFT BIN
RIGHT BIN
RMT BIN
WTR PROBE
ICE PROBE
HARV
SL-1
SL-2

(42)

ICE THICKNESS
PROBE

AIR
COMP

AIR
COMPRESSOR
WHEN USED

(75)

(25)
(9)
(8)

WATER LEVEL
PROBE

CONTACTOR
COIL

(56)
(26)

TERMINATES AT
PIN CONNECTION

(6)

LOW D.C.
VOLTAGE
PLUG
(1)

BIN
SWITCH

(74)

CLEAN
OFF
ICE

(2)

L3 L2

CONTACTOR
CONTACTS
(51)

FAN MOTOR
(AIR COOLED ONLY)
(85)

(86)

FAN CYCLE CONTROL
T2

RUN CAPACITOR**

T3 T1
COMPRESSOR

6-26

Part Number 80-1480-3

Section 6

Electrical System

S1400/S1600/S1800 - REMOTE - 1 PHASE
WATER
VALVE
(21)

(20)

(22)

HPR
SOLENOID
(55)

(89)

(82)

(78)

HIGH PRESSURE
CUTOUT

CONTROL BOARD

(88)

(2)

(79)

RH HARVEST
SOLENOID
(88)

(61)

L2 OR N

(87)

(77)
(60)

(6)
(5)

LH HARVEST
SOLENOID

(80)

(76)

(1)
(7)

DUMP
SOLENOID

(57)

(4)

(81)
(99)

(98)

WATER
PUMP

TRANS.
(58)
FUSE (7A)

(83)
LIQUID
SOLENOID

(59)
CLEAN
LEFT BIN
RIGHT BIN
RMT BIN
WTR PROBE
ICE PROBE
HARV
SL-1
SL-2

(42)

ICE THICKNESS
PROBE

AIR
COMP
(56)
(26)

(75)

CONTACTOR
COIL
AIR
COMPRESSOR
WHEN USED

(25)
(9)
(74)
(8)

WATER LEVEL
PROBE

(6)

LOW D.C.
VOLTAGE
PLUG

BIN
SWITCH
CLEAN
OFF
ICE

(1)

(2)
(RED)
RUN
CAPACITOR

COMPRESSOR
R
CONTACTOR
CONTACTS

*OVERLOAD
(BLACK)

(YELLOW)

(46)

R
R

PTCR

(50)

(45)

(44)
(51)

(F2)

(F1)

REMOTE
FAN MOTOR
REMOTE CONDENSER

RUN CAPACITOR

Part Number 80-1480-3

6-27

Electrical System

Section 6

S1400/S1600/S1800 - REMOTE - 3 PHASE
WATER
VALVE
(21)

(20)
L1

HPR
SOLENOID
(78)
(89)

(55)

RH HARVEST
SOLENOID
(88)

HIGH PRESSURE
CUTOUT

(22)

(82)
(79)

(87)

(61)

(88)

(77)

CONTROL BOARD
(2)
(60)

(6)

(80)

LH HARVEST
SOLENOID

(5)

(76)

(1)

DUMP
SOLENOID

(7)

(81)
(99)

(98)

(57)

(4)

WATER
PUMP
TRANS.
(83)

(58)
FUSE (7A)

LIQUID
SOLENOID
(59)

(42)

CLEAN
LEFT BIN
RIGHT BIN
RMT BIN
WTR PROBE
ICE PROBE
HARV
SL-1
SL-2
ICE THICKNESS
PROBE

(75)

AIR
COMP

CONTACTOR
COIL

(56)

AIR
COMPRESSOR
WHEN USED

(26)

(25)
(9)
(74)
(8)

WATER LEVEL
PROBE

LOW D.C.
VOLTAGE
PLUG

(6)
(1)

BIN
SWITCH

CLEAN
OFF
ICE

(2)

L3 L2

(F2)

CONTACTOR
CONTACTS
(F1)

(51)
T2
T3 T1

REMOTE
FAN MOTOR

COMPRESSOR

RUN CAPACITOR
REMOTE CONDENSER

6-28

Part Number 80-1480-3

Section 6

Electrical System

Component Specifications and Diagnostics
MAIN FUSE

BIN SWITCH

Function

The control board fuse stops ice machine operation if
electrical components fail causing high amp draw.

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.

Specifications
The main fuse is 250 Volt, 7 amp.

This occurs when the bin switch is opened and
closed again within 30 seconds during the harvest
cycle.

Check Procedure

! 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.
1. If the bin switch light is on with the water curtain
closed, the fuse is good.

! Warning

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
30 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.

Disconnect electrical power to the entire ice
machine before proceeding.
2. Remove the fuse. Check the resistance across the
fuse with an ohm meter.
Reading
Open (OL)
Closed (O)

Result
Replace fuse
Fuse is good

Important
The water curtain must be ON (bin switch(s) closed)
to start ice making.
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 right
bulkhead wall.
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.

Part Number 80-1480-3

6-29

Electrical System

Section 6

Symptoms

Water Curtain Removal Notes

Bin Switch Fails Open

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.

•

The ice machine will not start with the toggle switch
in the ice position, but runs normally with the toggle
switch in the clean position.

Bin Switch Fails Closed
•

Safety limit 2 is recorded in the control board
memory and the harvest cycle continues after the ice
opens and closes the water curtain (harvest cycle is
3.5 minutes long).

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 3.5minute point, the ice machine immediately returns to
another freeze sequence prechill.

Diagnostic Aids:
•

Always use the water curtain magnet to cycle the
switch (a larger or smaller magnet will affect switch
operation).

•

Readings are affected by your test lead connection
and VOM battery strength. Verify you have solid
connections and a correctly functioning VOM before
testing bin switch.

•

Open the curtain for 3 seconds, then close the
curtain for 3 seconds. This will allow your VOM
display to settle.

•

With the bin switch closed your meter reading should
be 0 (0 to 10 is acceptable). With the curtain open the
reading must be infinity (OL).

Continuity 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 25 times by
opening and closing the water curtain. Watch for
consistent readings each time the bin switch is
cycled open and closed (bin switch failure could be
erratic).

6-30

Part Number 80-1480-3

Section 6

Electrical System

COMPRESSOR ELECTRICAL DIAGNOSTICS

Determine if the Compressor is Seized

The compressor will not start or will trip repeatedly on
overload.

Check the amp draw while the compressor is trying to
start.

Check Resistance (Ohm) Values

COMPRESSOR DRAWING LOCKED ROTOR

NOTE: Compressor windings can have very low ohm
values. Use a properly calibrated meter.

The two likely causes of this are:

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.

•

Defective starting component

•

Mechanically seized compressor

To determine which you have:
1. Install high and low side gauges.

SINGLE PHASE COMPRESSORS

2. Try to start the compressor.

1. Disconnect power from the cuber and remove the
wires from the compressor terminals.

3. Watch the pressures closely.
A. If the pressures do not move, the compressor is
seized. Replace the compressor.

2. 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.

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.
Diagnosing Capacitors

2. The resistance values between L1 and L2, between
L2 and L3, and between L3 and L1 should all be
equal.

•

If the compressor attempts to start, or hums and trips
the overload protector, check the starting
components before replacing the compressor.

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.

•

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.

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.

Part Number 80-1480-3

6-31

Electrical System

Section 6

PTCR DIAGNOSTICS

Compressor Start Sequence

What is a PTCR?

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).

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.

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 S model ice machines have a
built-in 3-minute off time before it can restart.

6-32

Part Number 80-1480-3

Section 6

Electrical System

S-Model Automatic Shut-Off and Restart

Troubleshooting PTCR’s

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 30
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.

WHY A GOOD PTCR MAY FAIL
TO START THE COMPRESSOR

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.
L1
L2
CONTACTOR
CONTACTS
C

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:

RUN CAPACITOR
R

The PTCR must be cooled before attempting to start the
compressor, otherwise the high starting torque may not
last long enough.

•

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.

S
COMPRESSOR

SV1506

PTCR

During Start-Up (First .25 - 1.0 Seconds)
L2

CONTACTOR
CONTACTS
C

RUN CAPACITOR
R

Continued on next page …

S
COMPRESSOR

PTCR

SV1507

After Start-Up
(Current Flows Through Run Capacitor)

Part Number 80-1480-3

6-33

Electrical System

Section 6

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.)

•

Model
S500/S600
S850/S1000
S1200/S1400
S1600/S1800

Room
Manitowoc
Cera-Mite
Temperature
Part Number Part Number
Resistance
8505003
305C20
22-50 Ohms
8504993
305C19
18-40 Ohms
8504913

305C9

8-22 Ohms

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.

SV1540

CHECKING THE PTCR
Manitowoc PTCR’s 8505003 & 8504993

! Warning
Disconnect electrical power to the entire ice
machine at the building electrical disconnect box
before proceeding.
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.

SV1541

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.

6-34

Manitowoc PTCR 8504913

Part Number 80-1480-3

Section 6

Electrical System

DIAGNOSING START COMPONENTS

HARVEST ASSIST AIR COMPRESSOR

If the compressor attempts to start, or hums and trips the
overload protector, check the start components before
replacing the compressor.

Function

Capacitor
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.
Relay
The relay has a set of contacts that connect and
disconnect the start capacitor from the compressor start
winding. The contacts on the relay are normally closed
(start capacitor in series with the start winding). The
relay senses the voltage generated by the start winding
and opens the contacts as the compressor motor starts.
The contacts remain open until the compressor is deenergized.
Relay Operation Check
1. Disconnect wires from relay terminals.

The air compressor breaks the vacuum between the
sheet of ice and the evaporator which results in shorter
harvest cycles.
Specifications
115 Volt or 230 Volt - matches the ice machine voltage.
Check Procedure
1. Verify when the air compressor should be running in
the sequence of operation.
2. If the compressor is not running when it should be
check voltage at the control board.
3. If there is no voltage present at the control board,
replace the control board.
4. If there is voltage present at the control board check
for voltage at the air compressor connector.
5. If there is no voltage present at the air compressor
connector replace wire.
6. If there is voltage at the air compressor connector,
use a volt ohm meter to verify there is no continuity
through the motor windings then replace motor.

2. Verify the contacts are closed.
Measure the resistance between terminals 1 and 2.
No continuity indicates open contacts. Replace the
relay.
3. Check the relay coil.
Measure the resistance between terminals 2 and 5.
No resistance indicates an open coil. Replace the
relay.

Part Number 80-1480-3

6-35

Electrical System

Section 6

ICE/OFF/CLEAN TOGGLE SWITCH
Function
The switch is used to place the ice machine in ICE, OFF
or CLEAN mode of operation.
Specifications
Single-pole, single-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 the Molex
connector.
3. Check continuity across the toggle switch terminals.
Note where the wire numbers are connected to the
switch terminals, or refer to the wiring diagram to
take proper readings.
Switch Setting
ICE

CLEAN

OFF

Terminals
1-6
1-2
2-6
1-6
1-2
2-6
1-6
1-2
2-6

Ohm Reading
Open
Closed
Open
Closed
Open
Open
Open
Open
Open

4. Replace the toggle switch if ohm readings do not
match all three switch settings.

6-36

Part Number 80-1480-3

Section 6

Electrical System

ELECTRONIC CONTROL BOARD

N 115V
L2 208-230V
PRIMARY POWER SUPPLY

AC LINE VOLTAGE
ELECTRICAL
PLUG (NUMBERS
MARKED ON
WIRES)

MAIN FUSE (7A)

AIR COMPRESSOR
(NOT USED ON
ALL MODELS)

WATER PURGE
ADJUSTMENT

CLEAN LIGHT (YELLOW)
LEFT BIN LIGHT (GREEN)
RIGHT BIN LIGHT (GREEN)
REMOTE BIN LIGHT (GREEN)
WATER PROBE LIGHT (GREEN)
ICE PROBE LIGHT (GREEN)
HARVEST LIGHT (RED)
SAFETY LIMIT 1 LIGHT (RED)
SAFETY LIMIT 2 LIGHT (RED)
ICE THICKNESS
PROBE (3/16''
CONNECTION)

AUTOMATIC CLEANING
SYSTEM (AuCS) PLUG

DC LOW VOLTAGE
ELECTRICAL PLUG
(NUMBERS MARKED ON
WIRES)

WATER LEVEL PROBE

REMOTE BIN

SV3129

Control Board

Part Number 80-1480-3

6-37

Electrical System

Section 6

General

Inputs

S-Model control boards use a dual voltage transformer.
This means only one control board is needed for both
115V and 208-230V use.

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.

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” in Section 7.

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:

6-38

•

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

Part Number 80-1480-3

Section 6

Electrical System

Ice Thickness Probe (Harvest Initiation)

ICE THICKNESS CHECK

HOW THE PROBE WORKS

The ice thickness probe is factory-set to maintain the ice
bridge thickness at 1/8" (.32 cm).

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.

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" (.32 cm) thick.
2. If adjustment is necessary, turn the ice thickness
probe adjustment screw clockwise to increase
bridge thickness, or counterclockwise to decrease
bridge thickness. Set a 1/4” gap between the ice
thickness probe and evaporator as a starting point.
Then adjust to achieve a 1/8” bridge thickness.
NOTE: The starting point before final adjustment is
approximately a 3/16 inch gap.
ADJUSTING SCREW

SV3135
1/8” ICE BRIDGE THICKNESS

Ice Thickness Probe
ICE PROBE 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 probe.
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.

Part Number 80-1480-3

SV3132

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.

6-39

Electrical System

Section 6

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.
Step 2 Wait until the water starts to flow over the evaporator (freeze cycle).
Step 3 Disconnect the ice thickness control from the control board, then connect a jumper wire from the control
board to any cabinet ground and monitor the harvest light.
Monitoring of Harvest Light
The harvest light comes on, and 10 seconds later, ice machine
cycles from freeze to harvest.
The harvest light comes on but the ice machine stays in the
freeze sequence.
The harvest light does not come on.

Correction
The ice thickness probe is causing the malfunction.
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 control board is causing the malfunction.

HARVEST LIGHT

ICE THICKNESS
PROBE CONNECTION

Ice Machine Cycles Into Harvest Before Water Contact With The Ice Thickness Probe
Step 1 Disconnect the ice thickness probe from the control board.
Step 2 Wait until water starts to flow over the evaporator, then monitor the harvest light:
Monitoring of Harvest Light
The harvest light stays off and the ice machine remains in the
freeze sequence.
The harvest light comes on, and 10 seconds later, the ice
machine cycles from freeze to harvest.

6-40

Correction
The ice thickness probe is causing the malfunction.
Verify that the Ice Thickness probe is adjusted correctly.
The control board is causing the malfunction.

Part Number 80-1480-3

Section 6

Electrical System

Water Level Control Circuitry

FREEZE CYCLE CIRCUITRY

WATER LEVEL PROBE LIGHT

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.

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.
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 position.
Reposition 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 6-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.

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 and deenergizes strictly by time. The harvest water purge
jumper may be set at 45 seconds (top and center
terminals) or 0 seconds (center and bottom terminals).
Set the harvest water purge to 0 seconds when reverse
osmosis or deionized water is used. Use the factory
setting of 45 seconds for all other types of water.
HARVEST WATER PURGE ADJUSTMENT

45 SECOND
JUMPER
POSITION

0 SECOND
JUMPER
POSITION

SV3139
SV3140

Part Number 80-1480-3

6-41

Electrical System

Section 6

DIAGNOSING WATER LEVEL CONTROL CIRCUITRY
Problem: Water Trough Overfilling During The
Freeze Cycle

Step 2 Wait until the freeze cycle starts
(the freeze cycle starts when the water pump energizes).

Step 1 Start a new freeze sequence by moving the ICE/
OFF/CLEAN toggle switch to OFF, then back to ICE. (if
water flows with the switch off, check the water inlet
valve).

Step 3 Disconnect water level probe wire from control
board and connect a jumper from the control board
terminal and any cabinet ground, then refer to chart.

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.

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.

GREEN WATER LEVEL LIGHT

WATER LEVEL PROBE CONNECTION
SV3135

Step 3

Is water flowing into
the water trough?
NO
YES
YES

6-42

Step 3 Jumper wire connected from control board terminal to ground
The Water Level
The Water Inlet Valve
Cause
Light is:
Solenoid Coil is:
The water level probe is causing the problem.
ON
De-Energized
Clean or replace the water level probe.
ON
Energized
The control board is causing the problem.
OFF
De-Energized
The water fill valve is causing the problem.

Part Number 80-1480-3

Section 6

Electrical System

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).
Step 3 Disconnect the water level probe from the water
level probe terminal on the control board.

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.

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 shutoff mode. You must complete the entire diagnostic
procedure within 6 minutes of starting.

GREEN WATER LEVEL LIGHT

DISCONNECT WATER
LEVEL PROBE FROM
CONTROL BOARD
TERMINAL
SV3135

Step 3

Is water flowing into
the water trough?
YES
NO
NO

Part Number 80-1480-3

Step 3 Disconnect water level probe from control board terminal
The Water Level
The Water Inlet Valve
Cause
Light is:
Solenoid Coil is:
OFF
Energized
The water level probe is causing the problem.
Clean or replace the water level probe.
OFF
Energized
The water inlet valve is causing the problem.
ON OR OFF
De-Energized
The control board is causing the problem.

6-43

Electrical System

Section 6

Diagnosing An Ice Machine That Will Not Run
! 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
1
2
3
4
5
6
7

6-44

Check
Verify primary voltage supply to ice
machine.
Verify the high-pressure cutout is closed.
Verify control board fuse is OK.
Verify the bin switch functions properly.
Verify ICE/OFF/CLEAN toggle switch
functions properly.
Verify low DC voltage is properly
grounded.
Replace the control board.

Notes
Verify that the fuse or circuit breaker is closed.
The H.P.C.O. is closed if primary power voltage is present at terminals
#55 and #56 on the control board.
If the bin switch light functions, the fuse is OK.
A defective bin switch can falsely indicate a full bin of ice.
A defective toggle switch may keep the ice machine in the OFF mode.
Loose DC wire connections may intermittently stop the ice machine.
Be sure Steps 1-6 were followed thoroughly. Intermittent problems are
not usually related to the control board.

Part Number 80-1480-3

Section 6

Electrical System

S1000 - SELF CONTAINED 1 PHASE WITH TERMINAL BOARD

4
6
5

SV2071

Part Number 80-1480-3

6-45

Electrical System

Section 6

THIS PAGE INTENTIONALLY LEFT BLANK

6-46

Part Number 80-1480-3

Section 7

Refrigeration System

Section 7
Refrigeration System
Sequence of Operation
SELF-CONTAINED AIR OR WATER -COOLED MODELS
EVAPORATOR

HEAT
EXCHANGER

EXPANSION VALVE

HOT GAS SOLENOID VALVE

X
COMPRESSOR

STRAINER

AIR OR WATER
CONDENSER

DRIER
RECEIVER
(WATER COOLED ONLY)

HIGH PRESSURE VAPOR

HIGH PRESSURE LIQUID

LOW PRESSURE LIQUID

LOW PRESSURE VAPOR
SV1569

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

Freeze Cycle 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.

The refrigerant absorbs heat from water running over the
evaporator surface. The suction pressure gradually
drops as ice forms.

Part Number 80-1480-3

7-1

Refrigeration System

Section 7

EVAPORATOR

HEAT
EXCHANGER

EXPANSION VALVE

HOT GAS SOLENOID VALVE

COMPRESSOR

STRAINER

AIR OR WATER
CONDENSER

DRIER
RECEIVER
(WATER COOLED ONLY)

HIGH PRESSURE VAPOR

HIGH PRESSURE LIQUID

LOW PRESSURE LIQUID

LOW PRESSURE VAPOR
SV1570

Figure 7-2. Self-Contained Harvest Cycle
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.

7-2

Part Number 80-1480-3

Section 7

Refrigeration System

REMOTE MODELS
EVAPORATOR

HEAT
EXCHANGER

EXPANSION VALVE
STRAINER

COMPRESSOR

HOT GAS SOLENOID VALVE
REMOTE
CONDENSER

CHECK VALVE

LIQUID
LINE
SOLENOID
VALVE

HARVEST PRESSURE
REGULATING VALVE

HEAD
PRESSURE
CONTROL
VALVE

X
DRIER
H.P.R. SOLENOID
VALVE

CHECK VALVE

RECEIVER
SERVICE
VALVE

RECEIVER

HIGH PRESSURE VAPOR

HIGH PRESSURE LIQUID

LOW PRESSURE LIQUID

LOW PRESSURE VAPOR

SV1566

Figure 7-3. Remote Pre-Chill and Freeze Cycle
Prechill Refrigeration Sequence

Freeze Cycle 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.

The refrigerant absorbs heat from the water running over
the evaporator surface. The suction pressure gradually
drops as ice forms.

Part Number 80-1480-3

The headmaster control valve maintains discharge
pressure in ambient temperatures below 70°F (21.1°C).
(See “Headmaster Control Valve”.)

7-3

Refrigeration System

Section 7
EVAPORATOR

HEAT
EXCHANGER

EXPANSION VALVE
STRAINER
COMPRESSOR

HOT GAS SOLENOID VALVE
REMOTE
CONDENSER

CHECK VALVE
LIQUID
LINE
SOLENOID
VALVE

DRIER

RECEIVER
SERVICE
VALVE

HEAD
PRESSURE
CONTROL
VALVE

HARVEST PRESSURE
REGULATING VALVE

H.P.R. SOLENOID
VALVE

R
CHECK VALVE

RECEIVER

HIGH PRESSURE VAPOR

HIGH PRESSURE LIQUID

LOW PRESSURE LIQUID

LOW PRESSURE VAPOR

SV1567

Figure 7-4. Remote Harvest Cycle
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”.)

7-4

Part Number 80-1480-3

Section 7

Refrigeration System
EVAPORATOR

HEAT
EXCHANGER

EXPANSION VALVE
STRAINER

COMPRESSOR

HOT GAS SOLENOID VALVE
REMOTE
CONDENSER

CHECK VALVE

X
LIQUID
LINE
SOLENOID
VALVE

HEAD
PRESSURE
CONTROL
VALVE

HARVEST PRESSURE
REGULATING VALVE

DRIER

X
RECEIVER
SERVICE
VALVE

H.P.R. SOLENOID
VALVE

B
R
CHECK VALVE

RECEIVER

LIQUID/VAPOR EQUALIZED TO AMBIENT CONDITIONS

SV1568

Figure 7-5. Remote Automatic Shut-Off
Automatic Shut-Off
The compressor and liquid line solenoid valve are deenergized 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.

Part Number 80-1480-3

7-5

Refrigeration System

Section 7

S1400/S1600/S1800 SELF-CONTAINED TUBING SCHEMATIC

HEAT
EXCHANGER

EXPANSION VALVE

HARVEST
SOLENOID VALVE
COMPRESSOR

EVAPORATOR

HARVEST
SOLENOID VALVE
STRAINER

DRIER

RECEIVER

AIR OR WATER COOLED
CONDENSER

NOTE: The refrigeration sequence for self-contained
dual expansion valve ice machines is identical to selfcontained single expansion valve ice machines. See
Pages 7-1 and 7-2 for sequence of operation.

7-6

Part Number 80-1480-3

Section 7

Refrigeration System

S1400/S1600/S1800 REMOTE TUBING SCHEMATIC

HEAT
EXCHANGER

EXPANSION VALVE

LLSV

EVAPORATOR

HARVEST
SOLENOID VALVE

COMPRESSOR
STRAINER
DRIER

CHECK VALVE

HPR VALVE
CHECK VALVE
HEAD
PRESSURE
CONTROL
VALVE

REMOTE
CONDENSER

RECEIVER

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.

Part Number 80-1480-3

7-7

Refrigeration System
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.

Section 7
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.

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.

7-8

Part Number 80-1480-3

Section 7
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.

Refrigeration System
2. Refer to the appropriate 24 Hour Ice Production
Chart. 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.
__________

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?

•

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?

Freeze Time

1440
2.

Minutes in 24
Hours

Weight of One
Harvest

__________

Harvest Time

__________

Total Cycle Time

__________

__________
Total Cycle Time

__________
Cycles Per Day

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)

ICE PRODUCTION CHECK

Weights are in pounds.
Example: 2 lb., 6 oz. converts to 2.375 lb.
(6 oz. ÷ 16 oz. = .375 lb.)

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
condensing unit with a 90°F (32.2°C) outdoor ambient
temperature and 70°F (21.1°C) water.

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.

1. Determine the ice machine operating conditions:
Air temp. entering condenser:
_______ °
Air temp. around ice machine:
_______ °
Water temp. entering sump trough: _______ °

4. Compare the results of step 3 with step 2. Ice
production checks that are within 10% of the chart
are considered normal. 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.

Part Number 80-1480-3

7-9

Refrigeration System

Section 7

INSTALLATION/VISUAL INSPECTION CHECKLIST
Possible Problem
Ice machine is not level
Condenser is dirty
Water filtration is plugged (if
used)
Water drains are not run
separately and/or are not
vented
Line set is improperly
installed

7-10

Corrective Action
Level the ice machine
Clean the condenser
Install a new water filter
Run and vent drains
according to the Installation
Manual
Reinstall according to the
Installation Manual

WATER SYSTEM CHECKLIST
A water-related problem often causes the same
symptoms as a refrigeration system component
malfunction.
Water system problems must be identified and
eliminated prior to replacing refrigeration components.
Possible Problem
Water area (evaporator) is
dirty
Water inlet pressure not
between 20 and 80 psi
(1-5 Bar, 138- 552 kPa)
Incoming water temperature
is not between 35°F (1.6°C)
and 90°F (32.2°C).
Water filtration is plugged (if
used)
Water dump valve leaking
during the freeze cycle
Vent tube is not installed on
water outlet drain
Hoses, fittings, etc., are
leaking water
Water fill valve is stuck open
Water is spraying out of the
sump trough area
Uneven water flow across the
evaporator
Water is freezing behind the
evaporator
Plastic extrusions and
gaskets are not secured to
the evaporator

Corrective Action
Clean as needed
Install a water regulator valve
or increase the water
pressure
If too hot, check the hot water
line check valves in other
store equipment
Install a new water filter
Clean/replace dump valve as
needed
See Installation Instructions
Repair/replace as needed
Clean/replace as needed
Stop the water spray
Clean the ice machine
Correct the water flow
Remount/replace as needed

Part Number 80-1480-3

Section 7

Refrigeration System

ICE FORMATION PATTERN

2. Extremely Thin at Evaporator Outlet

Evaporator ice formation pattern analysis is helpful in ice
machine diagnostics.

There is no ice, or a considerable lack of ice formation at
the outlet of the evaporator.

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.

Examples: No ice at all at the outlet half of the
evaporator, but ice forms at the inlet half of the
evaporator. Or, the ice at the outlet of the evaporator
reaches 1/8" to initiate a harvest, but the inlet of the
evaporator already has 1/2" to 1" of ice formation.

Improper ice formation can be caused by any number of
problems.

Possible cause: Water loss, low on refrigerant, starving
TXV, faulty water fill valve etc.

Important
Keep the water curtain in place while checking the
ice formation pattern to ensure no water is lost.
1. Normal Ice Formation

NO ICE or THIN ICE

Ice forms across the entire evaporator surface.
At the beginning of the freeze cycle, it may appear that
more ice is forming at the inlet of the evaporator than at
the outlet. At the end of the freeze cycle, ice formation at
the outlet will be close to, or just a bit thinner than, ice
formation at the inlet. The dimples in the cubes at the
outlet of the evaporator may be more pronounced than
those at the inlet. This is normal.

OUTLET

ICE

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.
INLET

Figure 7-6. Extremely Thin Ice Formation at
Evaporator Outlet

Part Number 80-1480-3

7-11

Refrigeration System

Section 7

3. Extremely Thin at Evaporator Inlet

5. No Ice Formation

There is no ice, or a considerable lack of ice formation at
the inlet of the evaporator. Examples: The ice at the
outlet of the evaporator reaches 1/8" to initiate a harvest,
but there is no ice formation at all at the inlet of the
evaporator.

The ice machine operates for an extended period, but
there is no ice formation at all on the evaporator.
Possible causes: Water inlet valve, water pump, starving
expansion valve, low refrigerant charge, compressor,
etc.

Possible causes: Insufficient water flow, flooding TXV,
etc.

OUTLET
OUTLET

ICE

INLET
INLET

Figure 7-9. No Ice Formation

Figure 7-7. 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.

Important
The S1400 S1600 and S1800 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.

OUTLET

ICE

OUTLET

INLET
INLET

Figure 7-8. Spotty Ice Formation

Figure 7-10. S1400/S1600/S1800 Evaporator Tubing

7-12

Part Number 80-1480-3

Section 7
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.
Safety Limit #1: If the freeze time reaches 60 minutes,
the control board automatically initiates a harvest cycle.
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.
If 500 consecutive 3.5 minute harvest cycles occur, the
ice machine stops.
Safety Limit Indication
When a safety limit condition is exceeded:
•

Six consecutive cycles for safety limit 1 - the
control board enters the limit into memory.

•

Three consecutive cycles for safety limit 2 - 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 safety limit lights (SL-1 and SL-2). If a
safety limit has been recorded, either the SL-1 light
will flash once or the SL-2 light will flash twice,
corresponding to safety limit 1 or 2 to indicate which
safety limit stopped the ice machine.

Part Number 80-1480-3

Refrigeration System
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 cutout 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 cutout, 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.
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.

7-13

Refrigeration System

Section 7

Safety Limit #1
Refer to previous page for safety limit operation.
Freeze time exceeds 60 minutes for 6 consecutive freeze cycles.
Possible Cause
Improper installation
Water system

Electrical system

Miscellaneous

Refrigeration system

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.

7-14

Check/Correct
See “Installation/Visual Inspection Checklist”
Low water pressure [20 psi (138 kPa) min.]
High water pressure [80 psi (552 kPa) 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
Loss of water from sump area
Low incoming voltage
Ice thickness probe out of adjustment
Harvest cycle not initiated electrically
Contactor not energizing
Compressor electrically non-operational
Defective fan cycling control
Defective fan motor
Restricted condenser airflow
High inlet air temperature (Self-Contained -110°F/43.3°C max.;
Remote - 120°F/49°C max.)
Condenser discharge air recirculation
Dirty condenser filter
Dirty condenser
Restricted condenser water flow
Low water pressure [20 psi (138 kPa) min.]
High water temperature (90°F/32.2°C max.)
Dirty/defective water regulating valve
Water regulating valve out of adjustment
Improper refrigerant charge
Non-Manitowoc components
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

•

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 a Safety Limit light did not flash prior to the ice
machine restarting, then the ice machine did not stop
because it exceeded a safety limit.

Part Number 80-1480-3

Section 7

Refrigeration System

Safety Limit #2
Refer to page 7-11 for safety limit operation.
Harvest time exceeds 3.5 minutes for 500 consecutive harvest cycles.
Possible Cause
Improper installation
Water system

Electrical system

Refrigeration system

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.

Part Number 80-1480-3

Check/Correct
See “Installation/Visual Inspection Checklist”
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 (138 kPa) min.]
Loss of water from sump area
Clogged water distribution tube
Dirty/defective water fill valve
Defective water pump
Ice thickness probe out of adjustment
Ice thickness probe dirty
Bin switch defective
Premature harvest
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

•

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 a Safety Limit light did not flash prior to the ice
machine restarting, then the ice machine did not stop
because it exceeded a safety limit.

7-15

Refrigeration System

Section 7
3. Perform an actual discharge pressure check.

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.
Use the operating conditions determined in step 1 to
find the published normal discharge pressures.
Freeze Cycle _______

Beginning of Cycle
Middle of Cycle
End of Cycle

Freeze Cycle
PSIG (kPa)
__________
__________
__________

Harvest Cycle
PSIG (kPa)
__________
__________
__________

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.

Harvest Cycle _______

Freeze Cycle Discharge Pressure High Checklist
Possible Cause
Improper installation
Restricted condenser air flow (air-cooled models)

Restricted condenser water flow (water-cooled
models)

Improper refrigerant charge

Other

Check/Correct
See “Installation/Visual Inspection Checklist”
High inlet air temperature (Self-Contained -110°F/43.3°C max.;
Remote - 120°F/49°C max.)
Condenser discharge air recirculation
Dirty condenser filter
Dirty condenser
Defective fan cycling control
Defective fan motor
Low water pressure [20 psi (138 kPa) min.]
High inlet water temperature (90°F/32.2°C max.)
Dirty condenser
Dirty/defective water regulating valve
Water regulating valve out of adjustment
Overcharged
Non-condensables in system
Wrong type of refrigerant
Non-Manitowoc components in system
High side refrigerant lines/component restricted (before mid-condenser)
Defective head pressure control valve (remote models)

Freeze Cycle Discharge Pressure Low Checklist
Possible Cause
Improper installation
Improper refrigerant charge
Water regulating valve (water-cooled condensers)
Other

Check/Correct
See “Installation/Visual Inspection Checklist”
Undercharged
Wrong type of refrigerant
Out of adjustment
Defective
Non-Manitowoc components in system
Defective head pressure control valve (remote models)
Defective fan cycle control

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

7-16

Part Number 80-1480-3

Section 7

Refrigeration System
NOTE: Analyze discharge pressure before analyzing
suction pressure. High or low discharge pressure may
be causing high or low suction pressure.

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.
Procedure
Step
1. Determine the ice machine operating
conditions.
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.

Example Using SY1004A Model Ice Machine
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
Published freeze cycle time:
8.5 - 9.8 minutes

Published freeze cycle suction pressure:
58-28 PSIG

Published Freeze Cycle Time (minutes)

2B. Compare the published freeze cycle time
and published freeze cycle suction pressure.
Develop a chart.

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.
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.

Part Number 80-1480-3

Beginning of freeze cycle:
Middle of freeze cycle:
End of freeze cycle:
Time Into
Freeze Cycle
1 minutes
5 minutes
10 minutes

Published
Pressure
58 PSIG
43 PSIG
28 PSIG

70 PSIG at 1 minute
57 PSIG at 7 minutes
40 PSIG at 14 minutes
Actual
Pressure
70 PSIG
48 PSIG
40 PSIG

Result
High
High
High

7-17

Refrigeration System

Section 7

Freeze Cycle Suction Pressure High Checklist
Possible Cause
Improper installation
Discharge pressure
Improper refrigerant charge
Other

Check/Correct
See “Installation/Visual Inspection Checklist”
Discharge pressure is too high, and is affecting low side
(See “Freeze Cycle Discharge Pressure High Checklist” )
Overcharged
Wrong type of refrigerant
Non-Manitowoc components in system
H.P.R. solenoid leaking
Harvest valve stuck open
TXV flooding (check bulb mounting)
Defective compressor

Freeze Cycle Suction Pressure Low Checklist
Possible Cause
Improper installation
Discharge pressure
Improper refrigerant charge
Other

Check/Correct
See “Installation/Visual Inspection Checklist”
Discharge pressure is too low, and is affecting low side
(See “Freeze Cycle Discharge Pressure Low Checklist”)
Undercharged
Wrong type of refrigerant
Non-Manitowoc components in system
Improper water supply over evaporator (See “Water System Checklist” )
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

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

7-18

Part Number 80-1480-3

Section 7
SINGLE EXPANSION VALVE ICE MACHINES COMPARING EVAPORATOR INLET AND
OUTLET TEMPERATURES
NOTE: This procedure will not work on the dual
expansion valve 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.

Refrigeration System
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.

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.
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.
______________

______________

Inlet Temperature

Outlet Temperature

_______________
Difference
Must be within 7° at 5
minutes into freeze cycle

Part Number 80-1480-3

7-19

Refrigeration System
HARVEST VALVE TEMPERATURE CHECK

Section 7
3. Feel the compressor discharge line.

General
NOTE: This procedure requires checking both harvest
valves on dual expansion valve S1400 and S1800 ice
machines.
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.

! Warning
The inlet of the harvest valve and the compressor
discharge line could be hot enough to burn your
hand. Just touch them momentarily.
4. Compare the temperature of the inlet of the harvest
valves to the temperature of the compressor
discharge line.
Findings
The inlet of the
harvest valve is cool
enough to touch and
the compressor
discharge line is hot.

Comments
This is normal as the discharge line
should always be too hot to touch and
the harvest 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
This is an indication something is
harvest valve is hot wrong, as the harvest valve inlet did
and approaches the not cool down during the freeze cycle.
temperature of a hot If the compressor dome is also entirely
compressor
hot, the problem is not a harvest valve
discharge line.
leaking, but rather something causing
the compressor (and the entire ice
machine) to get hot.
Both the inlet of the This is an indication something is
harvest valve and
wrong, causing the compressor
the compressor
discharge line to be cool to the touch.
discharge line are
This is not caused by a harvest valve
cool enough to
leaking.
touch.

1. Wait five minutes into the freeze cycle.
2. Feel the inlet of the harvest valve(s).

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.

7-20

Part Number 80-1480-3

Section 7

Refrigeration System

DISCHARGE LINE TEMPERATURE ANALYSIS

Procedure

General

Connect a temperature probe on the compressor
discharge line with-in 6" of the compressor and insulate.

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 and/
or higher inlet water temperature = higher discharge line
temperatures at the compressor.
Lower ambient air temperatures at the condenser and/or
lower supply water temperature= lower discharge line
temperatures at the compressor.
Regardless of ambient and water temperatures, the
freeze cycle discharge line temperature will be higher
than 160°F (71.1°C) [S850/S1000 Air & Water Machines
Only - 140°F (60°C)] on a normally operating ice
machine.

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.

S850/S1000 Air and Water Ice Machines Only:
Discharge Line Temperature Above 140°F (60°C) At
End Of Freeze Cycle:
Ice machines that are operating normally will have
consistent maximum discharge line temperatures above
140°F (60°C).
Discharge Line Temperature Below 140°F (60°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.

Part Number 80-1480-3

7-21

Refrigeration System
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”
for a few questions to ask when talking to the ice
machine owner.
Procedure
Step 1 Record the ice machine model number.
Step 2 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.
NOTE: Discharge Line Temperature will vary by model.
Refer to the model number to verify the correct
temperature to analyze.
Step 3 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 4 Add the check marks listed under each of the
four columns. Note the column number with the highest
total and proceed to “Final Analysis.”

Section 7
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 they 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.

NOTE: If two columns have matching high numbers, a
procedure was not performed properly and/or supporting
material was not analyzed correctly.

7-22

Part Number 80-1480-3

Section 7

Refrigeration System

REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES
S Models Single Expansion Valve - Ice Machine Model Number_________________
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
Ice Production

Installation and Water System
Ice Formation Pattern

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.
All installation and water related problems must be corrected before proceeding with chart.
Ice formation is extremely
thin on outlet of evaporator
-orNo ice formation on the
entire evaporator

Ice formation is extremely
thin on outlet of evaporator
-orNo ice formation on entire
evaporator

Ice formation normal
-orIce formation is extremely
thin on inlet of evaporator
-orNo ice formation on entire
evaporator

Ice formation normal
-orNo ice formation on entire
evaporator

Stops on safety limit:
1

Stops on safety limit:
1 or 2

Stops on safety limit:
1

Safety Limits
Refer to “Analyzing Safety Limits” to
eliminate all non-refrigeration
problems.

Freeze Cycle
Discharge Pressure
_____
______
1 minute Middle
into cycle
Freeze Cycle
Suction Pressure
_____
______
1 minute Middle

______
End

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.

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.

______
End

Wait 5 minutes into the freeze cycle.
Compare temperatures of

evaporator inlet & evaporator
outlet.
Inlet
____ ° F (° C)
Outlet
____ ° F (° C)
Difference ____ ° F (° C)
Wait 5 minutes into the freeze cycle.
Compare temperatures of

compressor discharge line
and harvest valve inlet.
Discharge Line Temperature
Record freeze cycle discharge line
temperature at the end of the freeze
cycle

_________°F (°C)

Suction pressure is High

Suction pressure is Low or
Normal

Suction pressure is High

Inlet and outlet
within 7°
of each other

Inlet and outlet
not within 7°
of each other
-andInlet is colder than outlet

Inlet and outlet
within 7°
of each other
-orInlet and outlet
not within 7°
of each other
-andInlet is warmer than outlet

Inlet and outlet
within 7°
of each other

The harvest valve inlet is
Hot
-andapproaches the temperature
of a Hot compressor
discharge line.

The harvest valve inlet is
Cool enough to hold hand
on
-andthe compressor discharge
line is Hot.

The harvest valve inlet is
Cool enough to hold hand
on
-andthe compressor discharge
line is Cool
enough to hold hand on.

The harvest valve inlet is
Cool enough to hold hand
on
-andthe compressor discharge
line is Hot.

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

S850/S1000
Air & Water Only

Discharge line temperature
140°F (60°C) or higher at
the end of the freeze cycle

Discharge line temperature
140°F (60°C)
or higher at the end of the
freeze cycle

Discharge line temperature
less than
140°F (60°C) at the end of
the freeze cycle

Discharge line
temperature 140°F (60°C)
or higher at the end of
the freeze cycle

Harvest Valve Leaking

Low On Charge
-OrTXV Starving

TXV Flooding

Compressor

Final Analysis
Enter total number of boxes checked
in each column.

Part Number 80-1480-3

7-23

Refrigeration System

Section 7

REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES
S Models Dual Expansion Valve - Ice Machine Model Number_________________
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
Ice Production

Installation and Water System
Ice Formation Pattern
Left Side__________________

Ice formation is extremely
thin on outlet of one side of
evaporator
-orNo ice formation on entire
evaporator

Ice formation normal
-orIce formation is extremely
thin at inlet of one side of
evaporator
-orNo ice formation on entire
evaporator

Ice formation normal
-orNo ice formation on entire
evaporator

Stops on safety limit:
1 or 2

Right Side_________________
Safety Limits
Refer to “Analyzing Safety Limits” to
eliminate all non-refrigeration
problems.

Freeze Cycle
Discharge Pressure
_____
______
1 minute Middle
into cycle
Freeze Cycle
Suction Pressure
_____
______
1 minute Middle

______
End

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.

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.

______
End

Wait 5 minutes into the freeze cycle.
Compare temperatures of

compressor discharge line
and both harvest valve inlets.
Discharge Line Temperature
Record freeze cycle discharge line
temperature at the end of the freeze
cycle

Suction pressure is
High

Suction pressure is
Low or Normal

Suction pressure is
High

One harvest valve inlet is
Hot
-andapproaches the temperature
of a Hot compressor
discharge line.

Both harvest valve inlets are
Cool enough to hold hand
on
-andthe compressor discharge
line is Hot.

Both harvest valve inlets are
Cool enough to hold hand
on
-andthe compressor discharge
line is Cool
enough to hold hand on.

Both harvest valve inlets
are Cool enough to hold
hand on
-andthe compressor discharge
line is Hot.

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

Harvest Valve Leaking

Low On Charge
-OrTXV Starving

TXV Flooding

Compressor

_________°F (°C)
Final Analysis
Enter total number of boxes checked
in each column.

7-24

Part Number 80-1480-3

Section 7

Refrigeration System

HARVEST PRESSURE REGULATING
(H.P.R.) SYSTEM

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.

Remotes Only
GENERAL

HARVEST CYCLE

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 deenergized.

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).

INLET

OUTLET
FLOW

Exact pressures vary from model to model. These can
be found in the “Operational Refrigerant Pressures”
charts.

SV1427

Figure 7-11. 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.

INLET

SV3053
OUTLET

Figure 7-12. H.P.R. Valve

Part Number 80-1480-3

7-25

Refrigeration System
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.

Section 7
5. Freeze cycle Head Pressure 220 psig (1517 kPa) or
higher?
If the head pressure is lower than 220 psig
(1517 kPa) refer to headmaster diagnostics.
6. Freeze cycle Suction Pressure normal?
Refer to analyzing suction pressure if suction
pressure is high or low.
7. 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).

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).
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).

7-26

Part Number 80-1480-3

Section 7

Refrigeration System
Diagnosing

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.

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.)
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
Valve not maintaining pressures

Probable Cause
Non-approved valve

Discharge pressure extremely high;
Liquid line entering receiver feels hot
Discharge pressure low; Liquid line
entering receiver feels extremely cold
Discharge pressure low; Liquid line
entering receiver feels warm to hot
Ice machine has safety limit #1 on cold
mornings.

Valve stuck in bypass

Corrective Measure
Install a Manitowoc Headmaster control
valve with proper setting
Replace valve

Valve not bypassing

Replace valve

Ice machine low on charge

Locate and repair refrigerant leak.

Part Number 80-1480-3

7-27

Refrigeration System

Section 7

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.

7-28

Part Number 80-1480-3

Section 7

Refrigeration System

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.

HIGH PRESSURE CUT-OUT (HPCO) CONTROL
Function
Stops the ice machine if subjected to excessive highside pressure.
The HPCO control is normally closed, and opens on a
rise in discharge pressure.
Specifications
Cut-out:

450 psig ±10 (3103 kPa ±69, 31 Bar ±.69)

Cut-in:

Manual or automatic reset
Must be below 300 psig (2068 kPa, 20.68
Bar ±.69) to reset

Specifications
Model
S300 / S320
S420 / S450
S500 / S600
S850
S1000 / S1200
S1400 / S1600
S1800

Cut-In (Close)

Cut-Out (Open)

250 psig ±5
1723 kPa ±34
17.23 Bar ±.34

200 psig ±5
1517 kPa ±34
1517 Bar ±.34

275 psig ±5
1896 kPa ±34
18.96 Bar ±.34

225 psig ±5
1551 kPa ±34
15.51 Bar ±.34

Check Procedure
1. Set ICE/OFF/CLEAN switch to OFF.
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.

Check Procedure
1. Verify fan motor windings are not open or grounded,
and fan spins freely.

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.

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.

! Warning
At:
above cut-in
below cut-out

Reading Should Be:
0 volts
line voltage

If discharge pressure exceeds 460 psig (2068 kPa,
20.68 Bar ) and the HPCO control does not cut out,
set ICE/OFF/CLEAN switch to OFF to stop ice
machine operation.

Fan Should Be:
running
off

Replace the HPCO control if it:

Part Number 80-1480-3

•

Will not reset [below 300 psig (2068 kPa, 20.68 Bar )]

•

Does not open at the specified cut-out point

7-29

Refrigeration System

Section 7

Cycle Time/24 Hour Ice Production/
Refrigerant Pressure Charts
These charts are used as guidelines to verify correct ice
machine operation.
Accurate collection of data is essential to obtain the
correct diagnosis.
•

Refer to “OPERATIONAL ANALYSIS TABLE” for the
list of data that must be collected for refrigeration
diagnostics. This list includes: before beginning
service, ice production check, installation/visual
inspection, water system checklist, ice formation
pattern, safety limits, comparing evaporator inlet/
outlet temperatures, discharge and suction pressure
analysis.

•

Ice production checks that are within 10% of the
chart are considered normal. This is due to variances
in water and air temperature. Actual temperatures
will seldom match the chart exactly.

•

Zero out manifold gauge set before obtaining
pressure readings to avoid misdiagnosis.

•

Discharge and suction pressure are highest at the
beginning of the cycle. Suction pressure will drop
throughout the cycle. Verify the pressures are within
the range indicated.

•

Record beginning of freeze cycle suction pressure
one minute after water pump energizes.

•

Regular cube production derate is 7%

•

50Hz production derate is 7%

•

50Hz regular cube total production derate is 14%

7-30

Part Number 80-1480-3

Section 7

Refrigeration System

S300 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.3-11.0
10.0-11.8
10.8-12.7
12.3-14.4

10.4-12.2
11.3-13.2
12.3-14.4
13.5-15.7

11.5-13.5
12.6-14.7
13.5-15.7
14.8-17.3

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.8-11.6
10.0-11.8
10.4-12.2
10.6-12.5

10.8-12.7
11.0-13.0
11.5-13.5
11.8-13.8

12.0-14.1
12.3-14.4
12.6-14.7
12.8-15.0

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

325
305
285
255

295
275
255
235

270
250
235
215

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

310
305
295
290

285
280
270
265

260
255
250
245

Based on average ice slab weight of 2.44 - 2.81lb

Based on average ice slab weight of 2.44 - 2.81 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
195-245
50-23
135-160
75-110
50/10.0
70/21.1
195-260
55-24
135-165
80-110
80/26.7
220-290
60-25
150-170
90-120
90/32.2
250-330
70-27
170-195
115-135
100/37.8
285-370
74-28
200-220
130-155
110/43.3
330-415
78-30
230-250
150-175
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal/24 hours

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
250
485
2100

Water regulating valve set to maintain 230 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
235-245
50-24
140-180
75-100
50/10.0
70/21.1
235-245
60-25
160-190
90-120
80/26.7
235-265
65-27
160-190
100-130
90/32.2
230-275
65-27
160-190
100-135
100/37.8
230-275
65-28
160-190
100-140
110/43.3
230-275
65-28
170-200
100-140
Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-31

Refrigeration System

Section 7

S320 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

12.3-14.0
13.1-14.9
15.2-17.3
18.0-20.4

13.1-14.9
14.6-16.6
17.2-19.5
19.8-22.4

14.1-16.0
15.8-18.0
18.0-20.4
20.8-23.5

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

12.7-14.4
13.1-14.9
13.6-15.5
14.1-16.0

13.6-15.5
14.1-16.0
14.6-16.6
15.2-17.3

15.2-17.3
15.2-17.3
15.8-18.0
16.5-18.7

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

340
320
280
240

320
290
250
220

300
270
240
210

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

330
320
310
300

310
300
290
280

280
280
270
260

Based on average ice slab weight of 3.25 - 3.65 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
195-260
60-34
130-160
80-115
50/10.0
70/21.1
195-260
70-36
130-165
90-120
80/26.7
215-295
75-36
140-165
110-125
90/32.2
240-320
80-38
155-180
120-135
100/37.8
290-365
90-40
175-215
14-165
110/43.3
325-415
95-42
200-230
160-185
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal / per
100 lbs of ice

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
90

160

1010

Water regulating valve set to maintain 230 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
225-245
60-38
150-185
85-105
50/10.0
70/21.1
225-245
68-38
150-190
100-120
80/26.7
225-250
78-39
155-195
110-145
90/32.2
225-255
80-40
155-200
115-145
100/37.8
225-260
82-41
155-205
120-150
110/43.3
225-265
85-42
155-210
120-150
Suction pressure drops gradually throughout the freeze cycle

7-32

Part Number 80-1480-3

Section 7

Refrigeration System

S420 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.4-10.0
9.9-10.6
10.4-11.1

10.2-10.8
10.7-11.5
11.4-12.1

11.1-11.8
11.7-12.5
12.5-13.3

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.9-9.5
9.1-9.8
9.4-10.0

9.6-10.3
9.9-10.6
10.2-10.8

10.7-11.5
11.1-11.8
11.4-12.1

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

450
430
410

420
400
380

390
370
350

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

470
460
450

440
430
420

400
390
380

Based on average ice slab weight of 3.40 - 3.60 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
195-255
50-30
125-150
70-90
50/10.0
70/21.1
195-270
60-30
135-190
80-115
80/26.7
220-285
62-32
135-195
80-115
90/32.2
250-320
70-34
175-195
85-115
100/37.8
290-390
75-35
190-215
115-140
110/43.3
320-400
80-37
225-250
130-170
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal / per
100 lbs of ice

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
NA

200

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
70/21.1
225-265
52-30
160-190
85-100
80/26.7
230-265
56-30
170-190
90-110
90/32.2
230-270
62-31
170-195
95-115
100/37.8
235-275
65-31
170-200
100-120
110/43.3
240-280
65-32
170-205
100-120
Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-33

Refrigeration System

Section 7

S450 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.4-10.0
9.9-10.6
10.4-11.1

10.2-10.8
10.7-11.5
11.4-12.1

11.1-11.8
11.7-12.5
12.5-13.3

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.9-9.5
9.1-9.8
9.4-10.0

9.6-10.3
9.9-10.6
10.2-10.8

10.7-11.5
11.1-11.8
11.4-12.1

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

450
430
410

420
400
380

390
370
350

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

470
460
450

440
430
420

400
390
380

Based on average ice slab weight of 3.40 - 3.60 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
195-255
50-30
125-150
70-90
50/10.0
70/21.1
195-270
60-30
135-190
80-115
80/26.7
220-285
62-32
135-195
80-115
90/32.2
250-320
70-34
175-195
85-115
100/37.8
290-390
75-35
190-215
115-140
110/43.3
320-400
80-37
225-250
130-170
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal / per
100 lbs of ice

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
NA

200

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
70/21.1
225-265
52-30
160-190
85-100
80/26.7
230-265
56-30
170-190
90-110
90/32.2
230-270
62-31
170-195
95-115
100/37.8
235-275
65-31
170-200
100-120
110/43.3
240-280
65-32
170-205
100-120
Suction pressure drops gradually throughout the freeze cycle

7-34

Part Number 80-1480-3

Section 7

Refrigeration System

S500 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.5-11.2
10.4-12.2
11.4-13.4
13.7-16.0

11.1-13.1
12.3-14.4
13.3-15.6
15.0-17.5

12.0-14.0
12.6-14.8
14.1-16.5
15.9-18.6

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.3-10.9
9.7-11.4
9.9-11.7
10.1-11.9

10.6-12.5
10.9-12.8
10.9-12.8
11.4-13.4

12.0-14.0
12.3-14.4
12.6-14.8
13.0-15.2

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

540
500
460
390

470
430
400
360

440
420
380
340

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

550
530
520
510

490
480
480
460

440
430
420
410

Based on average ice slab weight of 4.12 - 4.75lb

Based on average ice slab weight of 4.12 - 4.75 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
200-255
44-26
130-160
75-90
50/10.0
70/21.1
200-255
47-28
135-160
80-95
80/26.7
220-295
50-29
160-175
90-105
90/32.2
250-325
55-31
175-205
105-120
100/37.8
270-370
60-32
200-225
120-145
110/43.3
290-425
75-36
220-260
150-165
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal / per
100 lbs of ice

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
87

138

458

Water regulating valve set to maintain 230 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
225-235
45-30
160-180
80-115
50/10.0
70/21.1
225-260
45-30
165-195
90-120
80/26.7
225-265
46-31
165-195
95-120
90/32.2
230-265
46-32
165-195
95-120
100/37.8
230-270
48-32
165-200
100-125
110/43.3
235-270
50-32
165-205
105-125
Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-35

Refrigeration System

Section 7

S500 SERIES

S600 SERIES

Remote

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.9-11.7

11.1-13.1

12.6-14.8

9.9-11.7
10.1-11.9
10.9-12.8
12.0-14.0

11.4-13.4
11.4-13.4
12.3-14.4
13.3-15.6

12.6-14.8
12.6-14.8
13.3-15.6
14.1-16.5

Harvest
Time

1-2.5

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

7.6-9.0
7.8-9.2
8.6-10.1
9.9-11.7

8.4-9.9
8.8-10.3
9.5-11.2
10.9-12.8

9.1-10.7
9.3-10.9
10.2-11.9
11.4-13.4

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

Times in minutes

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

520

470

420

520
510
480
440

460
460
430
400

420
420
400
380

Based on average ice slab weight of 4.12 - 4.75 lb
Ratings with JC495 condenser, dice or half dice cubes

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
-20/-28.9 to
210-240
42-29
105-160
75-100
50/10.0
70/21.1
235-250
48-31
105-165
85-100
80/26.7
245-260
50-32
110-165
85-100
90/32.2
250-270
52-33
110-170
90-105
100/37.8
265-315
60-34
125-175
90-110
110/43.3
295-365
62-35
130-185
95-115

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

650
640
590
520

600
580
540
480

560
550
510
460

Based on average ice slab weight of 4.12 - 4.75 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
220-255
45-27
140-160
60-80
50/10.0
70/21.1
220-270
45-28
145-170
70-90
80/26.7
230-300
50-30
165-185
75-95
90/32.2
265-345
54-32
180-215
80-105
100/37.8
300-395
60-35
210-245
85-120
110/43.3
340-430
65-39
240-280
100-140
Suction pressure drops gradually throughout the freeze cycle

Suction pressure drops gradually throughout the freeze cycle

7-36

Part Number 80-1480-3

Section 7

Refrigeration System

S600 SERIES

Self-Contained Water-Cooled

Remote

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

7.6-9.0
7.8-9.2
7.9-9.4
8.1-9.5

7.9-9.4
8.1-9.5
8.2-9.7
8.4-9.9

8.6-10.1
8.8-10.3
8.8-10.3
9.1-10.7

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production
Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Gal / per
100 lbs of ice

Water Temperature °F/°C

50/10.0

70/21.1

90/32.2

7.9-9.4

8.8-10.3

9.3-10.9

7.9-94
8.1-9.5
8.8-10.3
9.7-11.4

8.9-10.58.9-10.5
9.7-11.4
10.6-12.5

9.5-11.2
9.7-11.4
10.4-12.2
11.4-13.4

Harvest
Time

1-2.5

24 Hour Ice Production

50/10.0

70/21.1

90/32.2

650
640
630
620

630
620
610
600

590
580
580
560

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
110

Freeze Time
Water Temperature °F/°C

Times in minutes

Based on average ice slab weight of 4.12 - 4.75lb

Condenser
Water
Consumption

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

170

870

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

630

580

550

630
620
580
530

570
570
530
490

530
540
500
460

Based on average ice slab weight of 4.12 - 4.75 lb
Ratings with JC495 condenser, dice or half dice cubes

Operating Pressures

Water regulating valve set to maintain 2340 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
225-235
36-26
140-190
65-95
50/10.0
70/21.1
225-235
36-26
140-190
65-95
80/26.7
225-245
40-28
150-195
70-100
90/32.2
230-255
40-29
160-200
70-100
100/37.8
230-260
40-30
170-205
75-105
110/43.3
230-260
40-30
180-210
80-110

Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
-20/-28.9 to
210-240
40-29
130-190
62-80
50/10.0
70/21.1
225-250
50-30
130-200
75-95
80/26.7
245-275
52-31
130-200
75-100
90/32.2
245-285
52-32
135-200
80-100
100/37.8
260-315
55-32
140-200
80-100
110/43.3
290-365
60-34
170-200
85-100
Suction pressure drops gradually throughout the freeze cycle

Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-37

Refrigeration System

Section 7

S850 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.0-9.3
8.5-9.8
9.7-11.1
10.7-12.3

8.9-10.2
9.4-10.8
10.9-12.5
12.1-13.8

9.3-10.7
9.8-11.3
11.4-13.1
12.8-14.6

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

7.9-9.1
8.0-9.3
8.1-9.4
8.2-9.5

8.7-10.1
8.9-10.2
9.0-10.3
9.1-10.5

9.8-11.3
10.0-11.5
10.2-11.7
10.3-11.9

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

870
830
740
680

800
760
670
610

770
730
640
580

Based on average ice slab weight of 5.75 - 6.50lb
Regular cube derate is 7%

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
200-250
40-28
130-145
70-85
50/10.0
70/21.1
200-250
40-28
130-145
70-85
80/26.7
230-275
50-28
150-165
70-90
90/32.2
260-310
54-32
165-185
85-105
100/37.8
300-355
65-32
180-210
105-125
110/43.3
325-405
70-38
215-235
120-150
Suction pressure drops gradually throughout the freeze cycle

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

880
870
860
850

810
800
790
780

730
720
710
700

Based on average ice slab weight of 5.75- 6.50lb
Regular cube derate is 7%

Condenser
Water
Consumption
Gal/24 hours

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
50/10.0
70/21.1
90/32.2
690
1420
5200

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
225-235
46-28
150-160
75-90
50/10.0
70/21.1
225-235
46-28
150-160
75-90
80/26.7
225-240
50-30
155-175
80-95
90/32.2
230-270
60-30
155-185
85-105
100/37.8
240-275
60-30
165-185
90-110
110/43.3
245-280
60-30
175-190
95-115
Suction pressure drops gradually throughout the freeze cycle

7-38

Part Number 80-1480-3

Section 7

Refrigeration System

S850 SERIES

S1000 SERIES

Remote

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.6-9.9

9.1-10.5

9.7-11.1

8.9-10.2
9.1-10.5
9.8-11.3
10.9-12.5

9.5-11.0
9.8-11.3
10.7-12.3
11.9-13.6

10.0-11.5
11.3-11.9
11.2-12.9
12.5-14.4

Harvest
Time

1-2.5

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

6.3-7.3
6.9-8.1
7.8-9.0
9.3-10.7

6.9-8.0
7.6-8.8
8.5-9.8
10.2-11.7

7.6-8.8
8.4-9.6
9.4-10.8
11.0-12.7

Harvest
Time

.75-2.00

Times in minutes

24 Hour Ice Production
24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

820

780

740

800
780
730
670

750
730
680
620

720
700
650
590

Based on average ice slab weight of 5.75 -6.50 lb
Ratings with JC0895 condenser
Regular cube derate production 7%

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering
Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
-20/-28.9 to
220-250
50-30
100-160
70-90
50/10.0
70/21.1
220-260
50-30
100-160
70-90
80/26.7
240-265
50-30
100-160
75-90
90/32.2
250-280
52-30
100-160
75-95
100/37.8
280-320
52-30
110-165
75-95
110/43.3
310-365
62-31
125-170
80-100

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1060
980
890
770

990
910
830
710

910
840
760
660

Based on average ice slab weight of 5.75 - 6.50lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
195-255
50-26
130-145
70-90
50/10.0
70/21.1
220-275
50-26
130-145
70-90
80/26.7
235-290
52-28
150-165
75-95
90/32.2
265-330
58-28
165-185
85-110
100/37.8
300-360
60-31
180-210
95-120
110/43.3
330-415
66-32
215-235
115-145
Suction pressure drops gradually throughout the freeze cycle

Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-39

Refrigeration System

Section 7

S1000 SERIES

Self-Contained Water-Cooled

Remote

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

6.8-7.9
6.9-8.0
6.9-8.1
7.0-8.1

7.4-8.6
7.5-8.7
7.6-8.8
7.7-8.9

8.5-9.8
8.6-9.9
8.7-10.1
8.9-10.2

Harvest
Time

.75-2.00

Times in minutes

24 Hour Ice Production
Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Gal/24 hours

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

7.1-8.3

7.6-8.8

8.4-9.6

7.5-8.7
7.7-8.9
8.1-9.4
8.7-10.1

8.0-9.3
8.2-9.5
8.7-10.1
9.4-10.8

8.9-10.2
9.1-10.5
9.7-11.1
10.7-12.3

Harvest
Time

.75-2.00

Times in minutes

Water Temperature °F/°C

24 Hour Ice Production

50/10.0

70/21.1

90/32.2

1000
990
980
970

930
920
910
900

830
820
810
800

Based on average ice slab weight of 5.75- 6.50lb

Condenser
Water
Consumption

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
50/10.0
70/21.1
90/32.2
710
1500
5100

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
235-245
40-24
160-175
75-90
50/10.0
70/21.1
235-245
40-25
160-175
75-90
80/26.7
235-250
42-26
170-185
80-95
90/32.2
240-270
48-28
175-205
85-105
100/37.8
250-280
52-28
180-210
90-110
110/43.3
250-285
54-28
185-215
95-115

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

960

910

840

920
900
860
810

870
850
810
760

800
780
740
680

Based on average ice slab weight of 5.75- 6.50lb
Ratings with JC0895 condenser

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
-20/-28.9 to
220-255
40-26
100-170
65-90
50/10.0
70/21.1
245-260
40-27
100-170
65-90
80/26.7
245-285
42-28
100-170
65-95
90/32.2
250-300
44-28
100-175
65-100
100/37.8
275-330
48-29
115-180
65-105
110/43.3
310-375
56-31
125-195
65-105
Suction pressure drops gradually throughout the freeze cycle

Suction pressure drops gradually throughout the freeze cycle

7-40

Part Number 80-1480-3

Section 7

Refrigeration System

S1200 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

7.3-8.2
7.6-8.5
8.4-9.4
9.5-10.6

8.3-9.3
8.6-9.6
9.2-10.3
10.5-11.7

8.8-9.8
9.2-10.3
10.1-11.3
11.4-12.6

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

7.1-7.9
7.4-8.2
7.5-8.4
7.9-8.8

7.8-8.7
7.9-8.8
8.1-9.1
8.2-9.2

9.1-10.1
9.1-10.1
9.3-10.4
9.4-10.5

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1230
1190
1090
980

1100
1070
1010
900

1050
1010
930
840

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1260
1220
1200
1150

1160
1150
1120
1110

1020
1020
1000
990

Based on average ice slab weight of 7.5 - 8.25 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
50/10.0
195-255
36-23
135-155
65-85
70/21.1
220-275
38-24
140-180
70-90
80/26.7
240-300
38-25
155-180
75-95
90/32.2
265-340
38-26
175-195
85-100
100/37.8
310-390
40-27
200-215
95-110
110/43.3
340-430
42-29
225-240
115-130
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal / per
100 lbs of ice

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
91

150

660

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
50/10.0
235-245
36-24
150-175
70-85
70/21.1
235-245
36-24
150-185
70-90
80/26.7
235-250
38-25
160-190
80-95
90/32.2
240-270
40-26
170-195
80-105
100/37.8
250-280
40-26
175-205
85-110
110/43.3
250-285
42-26
180-215
90-115
Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-41

Refrigeration System

Section 7

S1400 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.4-9.4
8.9-9.9
10.2-11.2
11.6-12.9

9.4-10.5
9.9-11.1
10.9-12.2
12.8-14.2

10.0-11.2
10.8-12.0
11.8-13.2
13.8-15.4

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.9-10.0
8.9-10.0
8.9-10.0
9.0-10.1

9.8-10.9
9.8-10.9
9.6-10.7
10.0-11.2

11.2-12.5
11.4-12.6
11.6-12.9
11.7-13.0

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1450
1390
1250
1100

1320
1260
1160
1010

1250
1170
1080
940

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1380
1380
1380
1370

1280
1280
1300
1250

1130
1120
1100
1090

Based on average ice slab weight of 10 - 11 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
50/10.0
220-280
40-28
150-180
70-90
70/21.1
220-280
42-28
160-180
70-90
80/26.7
225-290
44-30
160-180
70-90
90/32.2
260-310
46-30
180-200
80-100
100/37.8
290-360
48-31
200-220
90-115
110/43.3
320-400
50-32
220-250
100-140
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal / per
100 lbs of ice

90/32.2 Air Temperature
Around Ice Machine
Water Temperature °F/°C
59/15.0
70/21.1
90/32.2
90

145

590

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
50/10.0
235-245
40-28
160-175
70-90
70/21.1
235-245
42-29
160-175
75-100
80/26.7
235-260
42-30
170-195
80-105
90/32.2
240-270
42-30
180-200
85-110
100/37.8
250-280
43-30
185-200
90-110
110/43.3
250-285
44-31
190-205
90-115
Suction pressure drops gradually throughout the freeze cycle

7-42

Part Number 80-1480-3

Section 7

Refrigeration System

S1400 SERIES

S1600 SERIES

Remote

Self-Contained Air-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.1-10.1

10.1-11.3

11.0-12.3

9.2-10.2
9.4-10.5
9.9-11.1

10.0-11.2
10.4-11.6
11.1-12.4

11.2-12.5
11.4-12.6
12.3-13.7

Harvest
Time

1-2.5

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.6-10.5
10.0-11.0
11.1-12.2
12.5-13.7

10.7-11.7
11.3-12.4
12.2-13.3
13.7-15.0

11.1-12.2
12.1-13.2
12.2-13.3
15.1-16.5

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production
24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1360

1240

1150

1350
1320
1260

1250
1210
1140

1130
1120
1040

Based on average ice slab weight of 10 - 11 lb
Ratings with JC1395 condenser

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
-20/-28.9 to
210-240
38-28
100-160
70-85
50/10.0
70/21.1
240-265
40-28
110-170
70-90
80/26.7
250-275
41-29
110-180
70-95
90/32.2
250-290
42-30
110-180
70-95
100/37.8
275-335
43-31
110-185
75-100
110/43.3
310-375
45-32
120-190
80-100

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1690
1630
1490
1340

1540
1460
1370
1230

1480
1380
1370
1130

Based on average ice slab weight of 13.0 - 14.125 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
50/10.0
220-280
46-27
150-165
70-90
70/21.1
220-280
50-28
150-165
70-90
80/26.7
240-300
55-32
155-175
75-95
90/32.2
270-330
58-34
165-185
80-100
100/37.8
310-375
65-36
185-200
90-105
110/43.3
330-415
70-38
200-245
95-115
Suction pressure drops gradually throughout the freeze cycle

Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-43

Refrigeration System

Section 7

S1600 SERIES

Self-Contained Water-Cooled

Remote

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

9.8-10.8
10.1-11.1
10.2-11.2
10.4-11.5

10.9-12.0
11.0-12.1
11.1-12.2
11.4-12.5

12.4-13.6
12.7-13.9
12.8-14.0
13.0-14.3

Harvest
Time

1-2.5

Times in minutes

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

10.4-11.5

11.2-12.3

12.4-13.6

10.5-11.5
10.8-11.9
11.7-12.8

11.7-12.8
11.7-12.8
12.9-14.1

12.5-13.7
13.0-14.3
13.8-15.2

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production
Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

24 Hour Ice Production

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1660
1610
1600
1570

1510
1500
1480
1450

1350
1320
1310
1290

Based on average ice slab weight of 13.0 - 14.125 lb

Condenser
Water
Consumption
Gal / per
100 lbs of ice

Air Temperature / Water Temperature °F
59/15.0
70/21.1
90/32.2
100

150

Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1570

1470

1350

1560
1520
1420

1420
1420
1300

1340
1290
1220

Based on average ice slab weight of 13.0 - 14.125 lb
Ratings with JC1395 condenser

Operating Pressures

550

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
50/10.0
235-245
46-27
160-175
70-90
70/21.1
235-275
50-27
160-180
70-95
80/26.7
240-280
52-28
160-190
70-100
90/32.2
240-285
52-28
160-190
75-100
100/37.8
250-290
52-29
165-195
75-100
110/43.3
255-295
52-30
170-200
80-100

Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
-20/-28.9 to
220-230
40-28
100-160
65-85
50/10.0
70/21.1
250-275
50-28
100-170
70-85
80/26.7
250-290
50-28
100-175
70-90
90/32.2
255-300
52-30
100-175
75-95
100/37.8
270-340
54-31
110-180
75-95
110/43.3
310-370
56-32
120-190
80-100
Suction pressure drops gradually throughout the freeze cycle

Suction pressure drops gradually throughout the freeze cycle

7-44

Part Number 80-1480-3

Section 7

Refrigeration System

S1800 SERIES

Self-Contained Air-Cooled

Self-Contained Water-Cooled

NOTE: These characteristics may vary depending on
operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.7-9.6
9.4-10.3
10.0-11.0
11.2-12.3

9.6-10.6
10.2-11.2
10.7-11.8
12.2-13.3

10.4-11.5
10.9-12.0
11.8-12.9
13.0-14.3

Harvest
Time

1-2.5

Times in minutes

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.5-9.4
8.5-9.4
8.6-9.4
8.7-9.6

9.2-10.1
9.3-10.3
9.4-10.4
9.6-10.5

10.7-11.8
10.9-12.0
11.1-12.2
11.2-12.3

Harvest
Time

.1-2.5

Times in minutes

24 Hour Ice Production

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1830
1720
1630
1470

1680
1600
1530
1370

1570
1510
1410
1290

Air Temp.
Around Ice
Machine
°F/°C
70/21.1
80/26.7
90/32.2
100/37.8

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1870
1870
1860
1830

1750
1730
1710
1690

1530
1510
1490
1470

Based on average ice slab weight of 13- 14.125 lb

Based on average ice slab weight of 13 - 14.125 lb

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
220-255
40-25
160-170
70-85
50/10.0
70/21.1
220-275
40-26
160-180
70-85
80/26.7
225-290
42-28
175-200
80-95
90/32.2
260-330
44-28
175-200
80-95
100/37.8
300-380
46-30
190-215
90-110
110/43.3
320-415
50-30
210-250
105-140
Suction pressure drops gradually throughout the freeze cycle

Condenser
Water
Consumption
Gal / per
100 lbs of ice

Air Temperature / Water Temperature °F
59/15.0
70/21.1
90/32.2
95

155

510

Water regulating valve set to maintain 240 PSIG discharge pressure

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice Discharge Suction Discharge Suction
Machine
Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
50/10.0
235-245
40-25
160-190
70-90
70/21.1
235-265
40-26
160-190
70-90
80/26.7
240-270
42-26
165-190
70-90
90/32.2
240-275
45-27
165-190
70-90
100/37.8
245-280
50-28
165-190
70-95
110/43.3
245-290
52-28
175-200
80-100
Suction pressure drops gradually throughout the freeze cycle

Part Number 80-1480-3

7-45

Refrigeration System

Section 7

S1800 SERIES
Remote
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Freeze Time
Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

8.9-9.8

10.0-11.0

10.7-11.7

9.0-9.9
9.2-10.1
9.6-10.5
10.4-11.5

10.1-11.1
10.1-11.1
10.0-11.0
11.5-12.6

10.8-11.9
10.8-11.9
11.6-12.7
12.5-13.7

Harvest
Time

1-2.5

Times in minutes

24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
-20/-28.9 to
70/21.1
80/26.7
90/32.2
100/37.8
110/43.3

Water Temperature °F/°C
50/10.0

70/21.1

90/32.2

1800

1630

1540

1780
1750
1690
1570

1620
1610
1630
1440

1520
1520
1430
1340

Based on average ice slab weight of 13- 14.125 lb
Ratings with JC1395 condenser

Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering Discharge Suction Discharge Suction
Condenser Pressure Pressure Pressure Pressure
°F/°C
PSIG
PSIG
PSIG
PSIG
-20/-28.9 to
250-220
44-26
110-170
65-85
50/10.0
70/21.1
280-240
50-28
115-180
70-90
80/26.7
290-245
50-28
115-180
70-90
90/32.2
300-250
52-28
120-195
70-90
100/37.8
340-260
60-28
125-210
70-90
110/43.3
390-295
60-30
125-220
80-100
Suction pressure drops gradually throughout the freeze cycle

7-46

Part Number 80-1480-3

Section 7

Refrigeration System

Refrigerant Recovery/Evacuation and Recharging
NORMAL SELF-CONTAINED MODEL PROCEDURES

SELF-CONTAINED RECOVERY/EVACUATION

Refrigerant Recovery/Evacuation

1. Place the toggle switch in the OFF position.

Do not purge refrigerant to the atmosphere. Capture
refrigerant using recovery equipment. Follow the
manufacturer’s recommendations.

2. Install manifold gauges, scale, and recovery unit or
two-stage vacuum pump.
MANIFOLD SET

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.

OPEN

LOW SIDE
SERVICE
VALVE

BACKSEATED

OPEN

BACKSEATED

HIGH SIDE
SERVICE
VALVE

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.
CONNECTIONS
Manifold gauge sets must utilize low loss fittings to
comply with U.S. Government rules and regulations.
Make these connections:
1. Suction side of the compressor through the suction
service valve.
2. Discharge side of the compressor through the
discharge service valve.

VACUUM PUMP/
RECOVERY UNIT
OPEN
CLOSED

SV1404A

Figure 7-13. 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 500 microns. Then, allow the pump to
run for an additional half hour. Turn off the pump
and perform a standing vacuum leak check.
5. Follow the Charging Procedures.

Part Number 80-1480-3

7-47

Refrigeration System

Section 7
2. Close the vacuum pump valve, the low side service
valve, and the low side manifold gauge valve.

Self-Contained Charging Procedures

Important
The charge is critical on all Manitowoc ice
machines. Use a scale or a charging cylinder to
ensure the proper charge is installed.
1. Be sure the toggle switch is in the OFF position.

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.

MANIFOLD SET

LOW SIDE
SERVICE
VALVE

3. Open the high side manifold gauge valve, and
backseat the high side service valve.

CLOSED

OPEN

FRONTSEATED

BACKSEATED

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.

HIGH SIDE
SERVICE
VALVE

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.
CHARGING
CYLINDER

VACUUM PUMP/
RECOVERY UNIT

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.

CLOSED
OPEN

SV1404B

Figure 7-14. Charging Connections

C. Open the low side service valve at the ice
machine.

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.
G. Remove the hoses from the ice machine and
install the caps.

7-48

Part Number 80-1480-3

Section 7

Refrigeration System

NORMAL REMOTE MODEL PROCEDURES
Refrigerant Recovery/Evacuation
Do not purge refrigerant to the atmosphere. Capture
refrigerant using recovery equipment. Follow the
manufacturer’s recommendations.

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.

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.
CONNECTIONS

Important
Recovery/evacuation of a remote system requires
connections at four points for complete system
evacuation. See the drawing on next page.

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 500 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.

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 quickconnect 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.

Part Number 80-1480-3

7-49

Refrigeration System

Section 7

HEAT EXCHANGER

EVAPORATOR

EXPANSION
VALVE

SOLENOID
VALVES

LOW SIDE
SERVICE VALVE
(BACKSEATED)
COMPRESSOR

STRAINER

HARVEST
PRESSURE
SOLENOID
VALVE

CHECK
VALVE

HARVEST
PRESSURE
REGULATING
VALVE

HIGH SIDE
SERVICE VALVE
(BACKSEATED)

LIQUID
LINE
SOLENOID

DISCHARGE LINE
QUICK CONNECT
SCHRAEDER FITTING

DRIER

REMOTE CONDENSER

RECEIVER
SERVICE VALVE
1/2 OPEN

CHECK VALVE

R
C

HEAD PRESSURE
CONTROL VALVE
MANIFOLD SET

OPEN

TEE
OPEN

OPEN
VACUUM PUMP/
RECOVERY UNIT

SCALE
CLOSED

SV1461

Figure 7-15. Recovery/Evacuation Connections

7-50

Part Number 80-1480-3

Section 7
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.

Refrigeration System
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.

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).

6. Run the ice machine in freeze cycle.

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.

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.

5. Ensure all vapor in charging hoses is drawn into the
machine, then disconnect the manifold gauges.

Part Number 80-1480-3

7. Close the high side service valve at the ice machine.
8. Open the low side service valve at the ice machine.

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.

7-51

Refrigeration System

Section 7

EVAPORATOR

HEAT EXCHANGER

EXPANSION
VALVE

STRAINER

COMPRESSOR

HARVEST
PRESSURE
SOLENOID
VALVE

CHECK
VALVE

HARVEST
PRESSURE
REGULATING
VALVE

SOLENOID
VALVES

LOW SIDE
SERVICE VALVE
(BACKSEATED)

HIGH SIDE
SERVICE VALVE
(BACKSEATED)

LIQUID
LINE
SOLENOID

DISCHARGE LINE
QUICK CONNECT
SCHRAEDER FITTING

DRIER

REMOTE CONDENSER
RECEIVER
SERVICE VALVE
1/2 OPEN

CHECK VALVE

R
C

HEAD PRESSURE
CONTROL VALVE

MANIFOLD SET

TEE

CLOSED

OPEN

CLOSED
SCALE

VACUUM PUMP/
RECOVERY UNIT

SV1462

OPEN

Figure 7-16. Remote Charging Connections

7-52

Part Number 80-1480-3

Section 7

Refrigeration System

SYSTEM CONTAMINATION CLEAN-UP
General
This section describes the basic requirements for
restoring contaminated systems to reliable service.

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.

Determining Severity Of Contamination

3. Check the odor and appearance of the oil.

System contamination is generally caused by either
moisture or residue from compressor burnout entering
the refrigeration system.

4. Inspect open suction and discharge lines at the
compressor for burnout deposits.

Inspection of the refrigerant usually provides the first
indication of system contamination. Obvious moisture or
an acrid odor in the refrigerant indicates contamination.

5. If no signs of contamination are present, perform an
acid oil test.
Check the chart below to determine the type of cleanup
required.

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
Mild contamination cleanup procedure
Refrigeration test kit and/or acid oil test shows contamination
Leak in water-cooled condenser
No burnout deposits in open compressor lines
Mild Compressor Burnout symptoms
Oil appears clean but smells acrid
Mild contamination cleanup procedure
Refrigeration test kit or acid oil test shows harmful acid content
No burnout deposits in open compressor lines
Severe Compressor Burnout symptoms
Oil is discolored, acidic, and smells acrid
Severe contamination cleanup procedure
Burnout deposits found in the compressor and lines, and in
other components

Part Number 80-1480-3

7-53

Refrigeration System
Mild System Contamination Cleanup Procedure

Section 7
Severe System Contamination Cleanup Procedure

1. Replace any failed components.

1. Remove the refrigerant charge.

2. If the compressor is good, change the oil.

2. Remove the compressor.

3. Replace the liquid line drier.

3. Disassemble the harvest solenoid valve. If burnout
deposits are found inside the valve, install a new
harvest valve, and replace manifold strainer, TXV
and harvest pressure regulating valve.

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. Wipe away any burnout deposits from suction and
discharge lines at compressor.
5. Sweep through the open system with dry nitrogen.

Important
Dry nitrogen is recommended for this procedure.
This will prevent CFC release.
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 (35 kPa).
B. Pull vacuum to 500 microns. Break the vacuum
with dry nitrogen and sweep the system.
Pressurize to a minimum of 5 psi (35 kPa).
C. Change the vacuum pump oil.
D. Pull vacuum to 500 microns. Run the vacuum
pump for 1/2 hour on self-contained models, 1
hour on remotes.

Important
Refrigerant sweeps are not recommended, as they
release CFC’s into the atmosphere.
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 …

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.

7-54

Part Number 80-1480-3

Section 7

Refrigeration System

10. Follow the normal evacuation procedure, except
replace the evacuation step with the following:

Important
Dry nitrogen is recommended for this procedure.
This will prevent CFC release.

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)

A. Pull vacuum to 1000 microns. Break the vacuum
with dry nitrogen and sweep the system.
Pressurize to a minimum of 5 psi (35 kPa .35 bar).

•

Water regulating valve (water-cooled only)

•

High pressure cut-out control

B. Change the vacuum pump oil.

•

High side service valve

C. Pull vacuum to 500 microns. Break the vacuum
with dry nitrogen and sweep the system.
Pressurize to a minimum of 5 psi (35 kPa .35 bar).

•

Low side service valve

Important

D. Change the vacuum pump oil.

This is a required in-warranty repair procedure.

E. Pull vacuum to 500 microns. Run the vacuum
pump for 1/2 hour on self-contained models, 1
hour on remotes.

1. Disconnect power to the ice machine.

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 (7 kPa,
.7 bar), the filter-drier should be adequate for
complete cleanup.
B. If the pressure drop exceeds 1 psi (7 kPa, .7 bar),
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.

Part Number 80-1480-3

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.

! 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.
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%.

7-55

Refrigeration System

Section 7

SV1406

Figure 7-17. Using Pinch-Off Tool

7-56

Part Number 80-1480-3

Section 7

Refrigeration System

FILTER-DRIERS
The filter-driers used on Manitowoc ice machines are
manufactured to Manitowoc specifications.
The difference between Manitowoc driers and off-theshelf driers is in filtration. Manitowoc driers have dirtretaining 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.

Important
Driers are covered as a warranty part. The drier
must be replaced any time the system is opened for
repairs.

Listed below are the recommended O.E.M. field
replacement driers:

Model
S300A S300W
S320A S320W
S420A S420W
S450A S450W
S500A S500W
S600A S600W
S850A S850W
S1000A S1000W
S1200A S1200W
S500N S600N
S850N S1000N
S1400A S1400W
S1400N
S1600A S1600W
S1600N
S1800A S1800W
S1800N
Suction Filter

Drier
Size

End
Connection
Size

Part
Number

UK-032S

1/4"

89-3025-9

UK-052S

1/4"

89-3024-9

UK-053S

3/8"

89-3027-9

UK-165S

5/8"

89-3028-3

Suction Filter used when cleaning up severely contaminated systems

Part Number 80-1480-3

7-57

Refrigeration System

Section 7

TOTAL SYSTEM REFRIGERANT CHARGES

Additional Refrigerant Charges
For line sets between 50’ - 100’.

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
S300
S320
S420
S450

S500

S600

S850

S1000

S1200

S1400

S1600

S1800

Version
Air-Cooled
Water-Cooled
Air-Cooled
Water-Cooled
Air-Cooled
Water-Cooled
Air-Cooled
Water-Cooled
Air-Cooled
Water-Cooled
Remote
Air-Cooled
Water-Cooled
Remote
Air-Cooled
Water-Cooled
Remote
Air-Cooled
Water-Cooled
Remote
Air-Cooled
Water-Cooled
Air-Cooled
Water-Cooled
Remote
Air-Cooled
Water-Cooled
Remote
Air-Cooled
Water-Cooled
Remote

Charge
18 oz.
15 oz.
20 oz.
19 oz.
21 oz.
20 oz.
21 oz.
20 oz.
26 oz.
22 oz.
6 lb.
32 oz.
28 oz.
6.5 lb.
36 oz.
32 oz.
8.5 lb.
36 oz.
38 oz.
8.5 lb.
38 oz.
42 oz.
44 oz.
40 oz.
11 lb.
48 oz.
48 oz.
11.5 lb.
52 oz.
48 oz.
12.5 lb.

Series

S500
S600
S850/S1000
S1400
S1600
S1800

Refrigerant
Nameplate to be added
Charge
for 50’ - 100’
line sets
6 lb.
1.5 lb.
(96 oz.)
(24 oz.)
6.5 lb.
1.5 lb.
(104 oz.)
(24 oz.)
8.5 lb.
2 lb.
(136 oz.)
(32 oz.)
11 lb.
2 lb.
(176 oz.)
(32 oz.)
11.5 lb.
2 lb.
(184 oz.)
(32 oz.)
12.5 lb.
1 lb.
(200 oz.)
(16 oz.)

Maximum
System Charge
Never Exceed
7.5 lb.
(120 oz.)
8.0 lb.
(128 oz.)
10.5 lb.
(168 oz.)
13 lb.
(208 oz.)
13.5 lb.
(216 oz.)
13.5 lb.
(216 oz.)

NOTE: All ice machines on this list are charged using
R-404A refrigerant.

7-58

Part Number 80-1480-3

Section 7

Refrigeration System

REFRIGERANT DEFINITIONS

Reclaim

Recover

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.

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.

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.

Part Number 80-1480-3

7-59

Refrigeration System
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.

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.

Section 7
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)

Manitowoc approves the use of:

– Whether the system has been contaminated
by this failure

1. New Refrigerant
•

– Compressor motor burnouts and improper
past service prevent refrigerant re-use.

Must be of original nameplate type.

2. Reclaimed Refrigerant
•

Must be of original nameplate type.

•

Must meet ARI Standard 700 (latest edition)
specifications.

7-60

– 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.

Part Number 80-1480-3

Section 7

Refrigeration System

HFC REFRIGERANT QUESTIONS AND ANSWERS
Manitowoc uses R-404A and R-134A HFC refrigerants with ozone depletion potential (ODP) factors of zero (0.0). R404A 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.

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 filterdrier for increased filtration and moisture removal.
During a repair, Manitowoc recommends installing
the drier just before hooking up a vacuum pump.
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.

Remember, care must be taken to prevent moisture
from getting into the refrigeration system during
refrigeration repairs.

Part Number 80-1480-3

7-61

Refrigeration System

Section 7

THIS PAGE INTENTIONALLY LEFT BLANK

7-62

Part Number 80-1480-3

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