CARRIER Package Units(both Units Combined) Manual L0604601

User Manual: CARRIER CARRIER Package Units(both units combined) Manual CARRIER Package Units(both units combined) Owner's Manual, CARRIER Package Units(both units combined) installation guides

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50ZH030-060

3-Phase Packaged Heat Pump

Visit "vv'vv'vv.12_lrri_r. L"oin

installation, Start-Up and Service instructions

HEATING & COOLING

NOTE: Read the entire instruction manual belk_re starting the

installation.

TABLE OF CONTENTS

SAFETY CONS1 f)ERATIONS ..................................................... ]

INTRODUCTION .......................................................................... 2

RECEIVING AND INSTALLATION .......................................... 2

Check Equipn_ent ...................................................................... 2

IDENTIFY UNIT ................................................................ 2

INSPECT SHIPMENT ........................................................ 2

Provide Unit Support ................................................................ 2

SLAB MOUNT ................................................................... 2

GROUND MOUNT ............................................................ 2

Provide Clearances .................................................................... 2

Place Unit .................................................................................. 2

Select and Install Ductwork ..................................................... 2

INSTALL FLANGES FOR DUCTWORK CONNEC-

TIONS (50ZH060 ONLY) .................................................. 2

CONVERTING HORIZONTAL DISCHARGE UNITS TO

DOWNFLOW (VERTICAL) DISCHARGE ...................... 6

Provide liar Condensate Disposal ............................................. 6

Install Electrical Connections ................................................... 7

HIGH-VOLTAGE CONNECTIONS .................................. 7

ROUTING POWER LEADS INTO UNIT ........................ 7

CONNECTING GROUND LEAD TO UNIT GROUND.7

ROUTING CONTROL POWER WIRES .......................... 7

ACCESSORY ELECTRIC HEAT WIRING ..................... 7

SPECIAL PROCEDURES FOR 208-V OPERATION .....7

PRE-START-UP ............................................................................ 9

START-UP ..................................................................................... 9

Check lor Refi"igerant Leaks .................................................... 9

LOCATE AND REPAIR REFRIGERANT LEAKS AND

CHARGE THE UNIT AS FOLLOWS: ............................. 9

Start-Up Cooling Section and Make Adjustnlents ................ 10

CHECKING COOLING CONTROL OPERATION ....... 10

COMPRESSOR ROTATION ........................................... 10

Refrigerant Charge .................................................................. 10

NO CHARGE .................................................................... 10

LOW CHARGE COOLING ............................................. 10

TO USE THE COOLING CHARGING CHART ............ 11

HEATING MODE CHARGE ........................................... 11

Indoor Airflow and Airflow Adjustn-ients .............................. IX

FOR 208/230-V ................................................................. 11

FOR 460-V MOTORS ...................................................... 11

Unit Controls ........................................................................... l l

HIGH-PRESSURE RELIEF VALVE ............................... IX

LOSS OF CHARGE SWITCH ......................................... 11

COMPRESSOR OVERLOAD .......................................... 11

Sequence of Operation ............................................................ 14

FAN OPERATION ............................................................ 14

COOLING .......................................................................... 14

HEAT PUMP HEATING .................................................. 14

DEFROST .......................................................................... 14

ELECTRIC RESISTANCE HEATING ............................ 14

C00155

Fig. 1--Unit 50ZH

MAINTENANCE ......................................................................... 14

Air Filter .................................................................................. 16

Unit Top Removal (Outdoor-Coil Side) ................................ 16

Indoor Blower and Motor ....................................................... 16

Outdoor Coil, Indoor Coil and Condensate Drain Pan ........ 17

Outdoor Fan ............................................................................ 19

Electrical Controls and Wiring ............................................... 19

ReliTigerant Circuit .................................................................. 19

Indoor Airflow ........................................................................ 19

Metering Devices .................................................................... 19

Lubrication .............................................................................. 19

Liquid Line Strainer ................................................................ 19

High Flow Valves ................................................................... 19

TROUBLESHOOTING ............................................................... 22

START-UP CHECKLIST ............................................................ 23

NOTE TO 1NSTALLER--Beli_re installation, READ THESE

INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,

make sure the User's Manual and Replacement Guide are leli with

the unit alier installation.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be

hazardous due to system pressure and electrical components. Only

trained and qualified workers should install, repair, or service

air-conditioning equipment.

Untrained workers can perlimn basic maintenance hlnctions of

cleaning coils and l]lters. All other operations should be perlormed

by trained service people. When working on air-conditioning

equipment, pay attention to precautions in the literature, tags, and

labels attached to the unit, and other sali_ty precautions that may

apply.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

PC 101 Printed in U.S.A. Catalog No. 50ZH-6SI Pg 1 2-06 Replaces: New

Follow all salcty codes. Wear salety glasses and work gloves. Use

quenching cloth lk_r unbrazing operations. Have fire extinguisher

available lbr all brazing operations.

Belore perlkmning service or maintenance operations on

system, turn off main power to unit and install lockout tag.

Turn off accessory heater power switch if applicable. Elec-

trical shock can cause serious injury or death.

Recognize salety inlormation. This is tile salcty-alert symbol ,/_ .

Whelk yon see this symbol in instructions or manuals, be alert to

the potential lot personal injury.

Understand the signal words DANGER, WARNING, CAUTION,

and NOTE. These words are used with the salDty-alert symbol.

DANGER identifies the most serious hazards wlaich will result in

severe personal injury or death. WARNING signifies a hazard

which could result ilkpersonal injury or death. CAUTION is used

to identify unsaid practices which would result in minor personal

injury or product and property damage. NOTE is used to highlight

suggestions which will result in enhanced installation, reliability,

or operation.

These instructions cover mininmm requirements and conl()rnl to

existing national standards and salbty codes. In some instances,

these instructions exceed certain local codes and ordinances,

especially those that may not have kept up with changing residen-

tial construction practices. We require these instructions as a

minimum lbr a said installation.

INTRODUCTION

50ZH heat pump units are fully sell'contained and designed lbr

outdoor installation (See Fig. 1). As shown in Fig. 2-4, units are

shipped in a horizontal-discharge configuration lot installation on

a ground-level slab. All units can be field-converted to downflow

discharge configurations lot rooftop applications with a field-

supplied plenum.

RECEIVING AND INSTALLATION

Step 1--Check Equipment

IDENTIFY UNIT

The unit model number and serial number arc stamped on the unit

identification plate. Check this inlornmtion against shipping pa-

pers. Verify that unit voltage and amperage listed on unit rating

plate agree with power supplied Ibr equipment.

INSPECT SHIPMENT

Inspect Ibr shipping damage while unit is still on shipping pallet.

If unit appears to be damaged or is torn loose from its securing

points, have it exandned by transportation inspectors belkwe

removal. Forward claim papers directly to transportation company.

Manufacturer is not responsible lk)rany damage incurred ilktransit.

Check all items against shipping list. Immediately notify the

nearest Carrier Air Conditioning office il' any item is missing.

To prevent loss or damage, leave all parts ilk original packages

until installation.

Step 2--Provide Unit Support

SLAB MOUNT

Place the unit on a rigid, level surl'ace_ suitable to support the unit

weight. A concrete pad or a suitable fiberglass mounting pad is

recommended. The fiat surface should extend approximately 2-in.

beyond the unit casing on the 2 sides. The duct connection side and

condensate drain connection sides should be flush with the edge of

the flat surface.

A 6-in. wide gravel apron should be used around the flat sl.n'face to

prevent airlIow blockage by grass or shrubs. Do not secure the unit

to the flat snrlace except where required by local codes.

The unit should be level to within 1/4 inch. This is necessary lot

the unit drain to lunction properly.

GROUND MOUNT

The unit may also be installed directly on the ground if local codes

permit. Place unit on level ground prepared with gravel lor

condensate discharge.

Step 3--Provide Clearances

The required minimum service clearances and clearances to

combustibles are shown in Fig. 2-4. Adequate ventilation and

outdoor coil air must be provided.

The outdoor fan pulls air through the outdoor coil and discharges

it through the fan on the top cover. Be sure that the fan discharge

does not recirculate to the outdoor coil. Do not locate the unit in

either a corner or under an overhead obstruction. The minimum

clearance under a partial overhang (such as a normal house

overhang) is 48 in. above the unit top. The maxinmm horizontal

extension of a partial overhang nmst not exceed 48 inches.

Do not place the unit where water, ice, or snow fi'om an overhang

or roof will damage or flood the unit. The unit may be installed on

wood flooring or on Class A, B, or C roof covering materials.

Do not restrict outdoor coil airflow. An air restriction at either

the outdoor-air inlet or the fan discharge can be harmful to

compressor lilt.

Step 4--Place Unit

Unit can be moved with the rigging holds provided in the unit base.

Relcr to Table 1 Ik_roperating weights. U.se extreme caution to

pre_ent damage when movillg the unit. Unit must remain in an

upright position durit_g all moving operatiot_s. The unit must be

level with in 1/4" 12_rproper condensate drainage; the ground-level

pad nmst be level belbre setting the unit in place. When a

field-fabricated support is used, be sure that the support is level

and that it properly supports the unit.

Step 5--Select and Install Duetwork

The design and installation of the duct system must be in

accordance with:

*the standards of the NFPA (National Fire Protection Associa-

tion) lbr installation of nonresidence-type air conditioning and

ventilating systems

* NFPA90A or residence-type, NFPA90B; and/or local codes

and residence-type, NFPA 90B

* and/or local codes and ordinances

Select and size ductwork, supply-air registers and return-air grilles

according to ASHRAE (American Society o1' Heating, Refrigera-

tion, and Air Conditioning Engineers) recommendations.

Use the duct flanges provided on the supply- and return-air

openings on the side of the unit. See Fig. 2-4 lot connection sizes

and locations. The 14-in. round duct collars (size 030-048 units)

are shipped inside the unit attached to the indoor blower. They are

field-installed and nmst be removed l'rom the indoor cavity prior to

start-up, even if they are not used lbr installation.

INSTALL FLANGES FOR DUCTWORK CONNECTIONS

(50ZH060 ONLY)

The 50ZH060 units are shipped with flanges which nlust be

field-installed on the unit.

To install unit fhmges:

[

[95

CON;)

¢0 N\

_/94 0 _4080

[ ,_] 16 06]

°1o

REQUIRED CLEARANCE TO COMBUSTIBLE MATE

INCHES [rnm]

TOP QF UNIT ......................................................................................... 0

DUCT SIDE QF UNIT ............................................................................. 0

SIDE OPPOSITE DUCTS ...................................................................... 0

BOTTOM OF UNIT ................................................................................. 0

NEC. REQUIRED CLEARANCES.

INCHES [mini

BETWEEN UNITS, POWER ENTRY SIDE .................................... 42.00 [1666.8]

UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.01

UNIT AND BLOCK OR CONCRETE WALLS AND OTHER

GROUNDED SURFACES, POWER ENTRY SIDE ......................... 42.00 [1066.8]

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

INCHES [mm]

CONDENSER COIL ACCESS SIDE .............................................. 36.06 [762.01

POWER ENTRY SIDE .................................................................... 36.08 [762.0]

(EXCEPT FOR NEC REQUIREMENTS)

UNIT TQP ....................................................................................... 48.0011219.21

SIDE OPPOSITE DUCTS .............................................................. 36.00 1762.0]

LEGEND

NEC National Electrical Code

NOTES:

1. Clearances must be maintained to prevent recirculation of air from outdoor-

fan discharge, with the exception of the condenser coil (36.00 in [914.0 mini. A

removable fence or barricade requires no clearance.

2. Dimensions are in inches. Dimensions in [ ] are in millimeters.

BI OWER, CONTROl BOX AND EVAP COli

ACC{SS PANEL

COMPRESSOR PANEL \

\\\\\\

FIELD ENTRY TO\

SERVICE PORTS _\

\\\

UNIT

50ZH030

LEFT SIDE VIEW FRONT VIEW 26.772

[10540]

'°6 k ; L6,.,,2.,o,[I 20] _1]

I.D. x 12.7 DEEP RIGHT SIDE VIEW C00156

ELECTRICAL CHARACTERISTICS

208/230-3-60

UNIT WEIGHT

Ib kg

254 116

CENTER OF GRAVITY IN. (MM)

X Y Z

14.0 (358) 18.0 (483) 12.0 (305)

Fig. 2--Unit Base Dimensions--5OZH030

....... ?940 ...........................4080 ..............

J 57} [16 06]

j o

! x; lii{° )i°

t?'6 tj )/,

REAR VIEW _ o

DiC 1 3PE_ _gs

REQUIRED CLEARANCE TO COMBUSTIBLE MATL

INCHES [mm]

TOP OF UNIT ......................................................................................... 0

DUCT SIDE OF UNIT ............................................................................. 0

SIDE OPPOSITE DUCTS ...................................................................... 0

BOTTOM OF UNIT ................................................................................. 0

NEC. REQUIRED CLEARANCES.

INCHES mm

BETWEEN UN TS, POWER ENTRY S DE .................................... 42.00 066.8

UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.01

UNIT AND BLOCK OR CONCRETE WALLS AND OTHER

GROUNDED SURFACES, POWER ENTRY SIDE ......................... 42.00 [1066.81

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

INCHES [mm]

CONDENSER COIL ACCESS SIDE .............................................. 30.00 [762.0]

POWER ENTRY SIDE .................................................................... 30.00 [762.0]

(EXCEPT FOR NEC REOUIREMENTS)

UNIT TOP ....................................................................................... 48.00 [1219.2]

SIDE OPPOSITE DUCTS .............................................................. 30.00 [762.0]

LEGEND

NEC - National Electrical Code

NOTES:

1. Clearances must be maintained to prevent recirculation of air from outdoor-

fan discharge, with the exception of the condenser coil (36.00 in [914.0 mm]. A

removable fence or barricade requires no clearance.

2. Dimensions are in inches. Dimensions in [ ] are in millimeters.

CONDENSER ,

12950

{5098]

5o_iot,! O[ UNil

V'-P()_"A IOR \ \!l t

8i2

[iI (),A:[R, /q ' q _Os

COMPRESSOR PANEL \

[I.20]

LEFT SIDE VIEW FRONTVIEW [,0_o] RIGHT SIDE VIEW

[250]

C00003

UNIT

50ZH036

50ZH042

50ZH048

ELECTRICAL CHARACTERISTICS UNIT WEIGHT

Lb Kg X Y

208/230-3-80,

480-3-80 277 128 14.0 (388) 19.0 (483)

208/230-3-80,

480-3-80 295 134 14.0 (388) 19.0 (483)

208/230-3-80, 328 149 14.0 (388) 19.0 (483)

480-3-80

Fig. 3--Unit Base Dimensions--50ZH036-048

CENTER OF GRAVITY IN. (MM)

15.0 (381)

1176

[465]

3525

88]

3.5

44]

COND,

COIL_

\\\ -

DIMENSIONS IN [] ARE IN INCHES

_3528 [1389]

_35217

[IBIB9]

_537

[211]

O n

REAR VIEW

12950

[50198]

BOTTOM OF UNIT

EVAP. "II" t

706

[27

889 J

[350]

LEFT SIDE VIEW

UNIT

50ZH06O

80]

REQUIRED CLEARANCETO COMBUSTIBLE MATL. INCHES [mini

TOP OF UNIT ......................................................................................... 0

DUCT SIDE OF UNIT ............................................................................. 0

SIDE OPPOSITE DUCTS ...................................................................... 0

BOTTOM OF UNIT ................................................................................. 0

NEC. REQUIRED CLEARANCES.

INCHES [mmI

BETWEEN UNITS, POWER ENTRY SIDE .................................... 42.00 [1066.8]

UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.0]

UNIT AND BLOCK OR CONCRETE WALLS AND OTHER

GROUNDED SURFACES, POWER ENTRY SIDE ......................... 42.00 [1066.8]

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

INCHES [mr:l]

CONDENSER COIL ACCESS SIDE .............................................. 30.00 [762.0]

POWER ENTRY SIDE .................................................................... 30.00 [762.0]

(EXCEPT FOR NEC REQUIREMENTS[

UNIT TOP ....................................................................................... 48.00 [1219.21

SIDE OPPOSITE DUCTS .............................................................. 30.00 [762.0]

LEGEND

NEC National Electrical Code

NOTES:

1. Clearances must be maintained to prevent recirculation of air from outdoor-

fan discharge, with the exception of the condenser coil (36.00 in [914.0 mini. A

removable fence or barricade requires no clearance.

2. Dimensions are in inches. Dimensions in [ ] are in millimeters.

81215

[31199]

BOTTOM OF UNIT

CONTROL BOX AND EVAP C01L

ACCESS PANEL

690

[272]

COMPRESSOR PANELFIELD NTRYTO

iioooo-

FRONT VIEW 2o772

[I 0540]

UNIT WEIGHT

Lb Kg

368 187

_5490

[2161]

Fig. 4--Unit Base Dimensions--50ZH060

ELECTRICAL CHARACTERISTICS

208/230-3-60, 460-3-60

CENTER OF GRAVITY IN. (MM)

XYZ

14.0 (356) 20.0 (508) 18.0 (406)

I.D. RIGHT SIDE VIEW C00158

1. Five pieces of flange are shipped on tile return-air opening of

the unit. Remove the flanges from the shipping position (See

Fig. 5). Screws are field-supplied.

2. One piece of llange is used as it is shipped (straight). Bend the

other 4 pieces at right angles.

3. Install the straight flange on tile right side of tile return-air

opening in holes provided. (See Fig. 6). Flanges should stick

out li"om unit to allow l_)r connection of ductwork.

4. Install 2 hand-lbrmed flanges onto mtum air opening in holes

provided to lbrm a rectangle around the remm air opening.

5. Install remaining 2 hand-lbmled flanges around discharge air

opening in holes provided.

6. Duetwork can now be attached to flanges.

When designing and installing ductwork, consider the lollowing:

When connecting ductwork to units, do not drill deeper than

3/4 inch in shaded area shown in Fig. 7 or coil may be

damaged.

All units should have field-supplied filters installed in the

return-air side of the unit. Recommended sizes lbr filters are

shown in Table 1.

Avoid abrupt duct size increases and reductions. Abrupt change

in duct size adversely al'li:cts air perlbmmnce.

IMPORTANT: Use flexible connectors between ductwork and

unit to prevent transmission of vibration. Use suitable gaskets to

ensure weathertight and airtight seal. When electric heat is

installed, use lire proof canvas (or similar heat resistant material)

connector between ductwork and unit discharge connection. If

flexible duct is used, insert a sheet metal sleeve inside duct. Heat

resistant duct connector (or sheet metal sleeve) must ectend 24 in.

li"om the unit discharge connection flange into the ductwork.

Size ductwork lbr cooling air quantity (cfln). The minimum air

quantity lbr proper electric heater operation is listed in Table 2.

Heater lindt switches may trip at air quantities below those

recommended.

Insulate and weatherproof all external ductwork. Insulate and

cover with a vapor barrier all ductwork passing through

conditioned spaces. Follow latest Sheet Metal and Air Condi-

tioning Contractors National Association (SMACNA) and Air

Conditioning Contractors Association (ACCA) mininmm in-

stallation standards lbr residential heating and air conditioning

systems.

Secure all ducts to building structure. Flash, weatherproof, and

vibration-isolate duct openings in wall or ronf according to

good construction practices.

Fig. 8 shows a typical duct system with 5(tZH unit installed.

CONVERTING HORIZONTAL DISCHARGE UNITS TO

DOWNFLOW (VERTICAL) DISCHARGE

t • =

Belbre perlorming service or maintenance operations on

system, turn off main power to unit and install lockout tag.

Turn off accessory heater power switch if applicable. Elec-

trical shock can cause serious injury or death.

Units are dedicated side supply products. They are not convertible

to verlical air supply. A field-supplied plenum nmst be used to

convert to vertical air discharge.

Step 6--Provide for Condensate Disposal

NOTE: Be sure that condensate-water disposal methods comply

with local codes, restrictions, and practices.

FIVE PIECES OF DUCT

FLANGE ATTACHED

HERE FOR SHIPMENT

COOOO5

Fig. 5--Shipping Location of Duct Flanges

(Size 060 Only)

HAND FORM

STRAIGHT PIECE

C00006

Fig. 6--Flanges Installed on 50ZH060 Units

Unit removes condensate through a 1 3/64-in. 1D hole (using

314-in. OD piping or tubing) which is located at the end of the unit.

See Fig. 2-4 lbr location of condensate connection.

Condensate water can be drained directly onto the roof in rool_op

installations (where permitted) or onto a gravel apron in ground-

level installations. Install a field-supplied condensate trap at end of

condensate connection to ensure proper drainage. Make sure that

the outlet of the trap is at least 1 in. lower than the drain-pan

condensate connection to prevent the pan li"om overflowing. Prime

the trap with water. When using a gravel apron, make sure it slopes

away from the unit.

If the installation requires draining the condensate water away

from the unit, install a 2-in. trap using a 314-in. OD robing or pipe.

(See Fig. 9 and lit.) Make sure that the outlet of the trap is at least

1 in. lower than the unit drain-pan condensate connection to

prevent the pan li"om overflowing. Prime the trap with water.

Connect a drain tube using a minimum of 314-in. PVC, 314-in.

C00007

Fig. 7--Area Not to Be DriJJed More Than 3/4-in.

CPVC, or 3/4-in. copper pipe (all field supplied). Do not undersize

tile tube. Pitch the drain tube downward at a slope of at least 1 in.

lk)r every I0 ft of horizontal run. Be sure to check tile drain tube

liar leaks. Prime trap at the beginning of the cooling season

start-up. Allowable glues lot condensate trap connection are:

Standard ABS, CPVC, or PVC cement.

Step 7--1nstMI Electrical Connections

The unit cabinet nmst have an nninterrupted, unbroken

electrical ground to minimize the possibility of personal

injury if an electrical fault should occur. This ground may

consist of an electrical wire connected to the unit ground in

the control compartnlent, or conduit approved lot electrical

ground when installed in accordance with NEC (National

Electrical Code), ANSI (American National Standards

lnstitute)/NFPA (latest edition) (in Canada, Canadian Elec-

trical Code CSA C22.1 ) and local electrical codes. Failure to

adhere to this warning could result in serious injury or death.

Failure to lk_llow these precautions could result in damage to

the unit being installed:

1. Make all electrical connections in accordance with NEC

ANSI/NFPA (latest edition) and local electrical codes

governing such wiring. In Canada, all electrical connec-

tions nmst be in accordance with CSA standard C22.1

Canadian Electrical Code Part 1 and applicable local

codes. Relier to unit wiring diagram.

2. Use only copper conductor lbr connections between

field-supplied electrical disconnect switch and unit. DO

NOT USE ALUMINUM WIRE.

3. Be sure that high-voltage power to unit is within operating

voltage range indicated on unit rating plate.

4. Insulate low-voltage wires fol7 highest voltage contained

within conduit when low-voltage control wires are run in

same conduit as high-voltage wires.

5. Do not damage internal components when drilling through

any panel to mount electrical hardware, conduiL etc. On all

3-phase units, ensure phases are balanced within 2 percent.

Consult local power company %r correction of improper

voltage and/or phase imbalance.

HIGH-VOLTAGE CONNECTIONS

The unit nmst have a separate electrical service with a field-

supplied, waterproof disconnect switch mounted at, or within sight

fl'om tile unit. Reler to the unit rating plate lk)r maximum

fuse/circuit breaker size and minimum circuit amps (ampacity) lot

wire sizing. See Table 3 lot electrical data.

The field-supplied disconnect may be monnted on the unit over the

high-voltage inlet hole. See Fig. 2-4.

Operalion of nnit on inlproper lilac voltage constilnles abuse |

and may cause unit danlage lhal could allecl warranly. J

ROUTING POWER LEADS INTO UNIT

Use only copper wire between disconnect and unit. Tile high-

voltage leads should be in a conduit until they enter the unit;

conduit termination at the unit must be watertight. Run the

high-voltage leads through tile hole on the control box side of the

unit (see Fig. 11 lbr location). When the leads are inside the uniL

run leads to the control box (Fig. 121. On 3-phase units, connect

the leads to the black, yellow, and blue wires (see Fig. 13).

CONNECTING GROUND LEAD TO UNIT GROUND

Relier to Fig. 12 and 13. Connect the ground lead to the chassis

using tile nnit ground lug in tile control box.

ROUTING CONTROL POWER WIRES

Form a drip-loop with the thermostat leads belk_re routing them

into the unit. Route the thertnostat leads through grommeted hole

provided in 1.naitinto unit control box (See Fig. 11). Connect

therntostat leads and unit power leads as shown in Fig. 13 & 14.

Route thermostat wires through grommet providing a drip-loop at

the paneh Connect low-voltage leads to the thermostat as shown in

Fig. 14.

The unit translomler supplies 24-v power %r complete system

including accessory electrical heater. Trans%rnler is factory wired

%r 2311-voperation. If supply voltage is 208 v, rewire translimner

primary as described in the Special Procedures %r 2118-v Opera-

]ion section below.

ACCESSORY ELECTRIC HEAT WIRING

Relier to accessory electric heat installation instructions lot inlk_r-

marion on installing accessory electric heat. Accessory electric

heat wiring is shown in Fig. 15 - 17.

SPECIAL PROCEDURES FOR 2118-V OPERATION

Make sure that the power supply to the unit is switched OFF

and install lockout tag belk_re making any wiring changes.

Electrical shock can cause serious injury or death.

1. Remove wire nut from connection of ORG wire to BLK wire.

Disconnect the ORG translormer-primary lead from the BLK

wire. Save wire nut. See unit wiring label.

2. Remove tile wire nut from tile temdnal on tile end of the RED

translbrnlel'-prinlal T lead.

3. Save tile wire nut.

4. Connect the RED lead to the BLK wire l?'om which the ORG

lead was disconnected. Insulate with wire nut fi'onl Step 1.

5. Using the wire nut renloved l?'onl the RED lead, insulate the

loose tertninal on the ORG lead.

6. Wrap the wire nuts with electrical tape so that the metal

temdnals cannot be seen.

Indoor blower-motor speeds may need to be changed %r 2118-v

operation. Reler to Indoor Airflow and Airflow Adjustments

section. (See Table of Contents lor page number.)

UNiT 50ZH 048 060

OPERATING WEIGHT (Ibs) 328 368

COMPRESSOR TYPE

REFRIGERANT Charge (Ib)

REFRIGERANT METERING DEVICE

OUTDOOR COiL

Rows...Fins/in.

Face Area (sq ft)

OUTDOOR-FAN MOTOR CFM

Nominal Rpm

Motor Hp

Diameter (in.)

INDOOR COiL

Rows...Fins/in.

Face Area (sq ft)

iNDOOR FAN MOTOR

Blower Motor Size (in.)

Nominal Cfm

Rpm Range

Number of Speeds

Factory Speed Setting

Motor Hp

CONNECTING DUCT SIZES

Supply Air (in.)

Return Air (in.)

FIELD-SUPPLIED RETURN-AIR FILTERt

Throwaway (in.)

* 460-v motors are 2-speed or 3-speed.

Table 1 -- Physical Data

030 036 042

254 277 295

Scroll

R-22

5.8 I6.9 i6.6 ]

Acutrol TM System

Copper Tubes, Aluminum Plate

2...17 1...17 2...17

6.7 11.1 9.3

Propeller

2000 2600 2600

1100 1100 1100

1/4 1/4 1/4

20 20 20

Copper Tubes, Aluminum Plate

3...18 3...15 3...18

3.1 4.0 4.0

Direct Drive

10x8 10x9 10x9

1000 1200 1400

550-1000 800-1050 800-1050

333

Med Low Med

1/4 1/2 1/2

Round

I I

9.1 [ 9.7

Fins

2...17 2...17

11.1 12.7

26OO

1100

1/4

Fins

4...15

4.4

10 x 9

1600

1000-1100

Low

320O

1100

1/2

4...15

4.9

10 x 10

2000

950-1100

Low

Square

13.9 x 13.9

13.9 x 27.8

tRequired filter sizes shown are based on the ARI (Air Conditioning and Refrigeration Institute) rated airflow at a velocity of 300 ft/min for throwaway type or 450 ft/min

for high capacity type. Recommended filters are 1-in. thick.

l 24 x 30 24 x 30

PRE-START-UP

Failure to observe the lollowing warnings could result in

serious inju Uor death:

1. Follow recognized salk:ty practices and wear protective

goggles when checking or servicing reb'igerant system.

2. Do not operate compressor or provide any electric power to

unit unless compressor terndnal cover is in place and

secured.

3. Do not remove compressor terminal cover tmtil all electri-

cal sources arc disconnected and lockout tag is installed.

4. Relieve all pressure fl'om both high- and low-pressure sides

of the system belk_retouching or disturbing anything inside

temfiual box if refrigerant leak is suspected around con>

pressor terminals. Use accepted methods to recover refrig-

erant.

5. Never attempt to repair soldered connection while refrig-

erant system is under pressure.

6. Do not use torch to remove any component. System

contains oil and rel]'igerant under pressure. To remove a

component, wear protective goggles and proceed as lol-

lows:

a. Shut olT electrical power to unit and install lockout tag.

b. Relieve all refrigerant from system using both high- and

low-pressure ports. Use accepted methods to recover

refrigerant.

c. Cut component connecting tubing with tubing cutter and

remove component fi'om unit.

d. Carefully unsweat renmiuing tubing stubs when neces-

sary. Oil can ignite when exposed to torch flame.

Use the Start-Up Checklist supplied at the end of this book and

proceed as IkHlows to inspect and prepare the unit Ik_r initial

start-up:

1. Remove all access panels.

2. Read and I]Hlow instructions on all DANGER, WARNING,

CAUTION, and INFORMATION labels anached to, or

shipped with, unit.

Make the R_llowing inspections:

a. Inspect I_r shipping and handling damages such as broken

lines, loose parts, disconnected wires, etc.

b. Inspect lor oil at all refrigerant tubing connections and on

unit base. Detecting oil generally indicates a refrigerant

leak. Leak-test all refiigerant tubing connections using

electronic leak detector, or liquid-soap solution. If a refrig-

erant leak is detected, see I_Hlowing Check I_)rRefiigerant

Leaks section.

c. Inspect all field- and factory-wiring connections. Be sure

that connections are completed and tight. Ensure wires do

not contact rel_'igerant robing or sheet metal edges.

d. Inspect coil fins. If damaged during shipping and handling,

carelidly straighten fins with a fin comb.

3. Verify the lollowing conditions:

a. Make sure that outdoor-fan blade is correctly positioned in

fan orifice. Top edge of blade should be 3.125 in. down

l]'om outdoor coil outlet grille (size 030 048, See Fig. 23)

or hub should be 0.70g-in. away l_'om motor end bell (size

061L See Fig. 24). See Outdoor Fan Adjustment section.

b. Make sure that air filter is in place.

c. Make sure that condensate drain trap is filled with water to

ensure proper drainage.

IPower Wiring

-- Control Wiring

_ Condenser Airflow *Sepa ate disconnect per NEC

E_ (National Electrrca_Code required

_ eec _c hea erwhen s ng e

Evaporato_Arrf_ow point c_nectionrs not used¸ C0000t_

C00008

Table 2--Minimum Airflow for Safe Electric Heater

Operation (CFM)

SIZE

030 036 042 048 060

750 900 1050 1200 1500

Fig. 8--Typical installation

1" (25ram)MIN.

TRAP

OUTLET _

2" (50mm) MIN

C99013

Fig. 9--Condensate Trap (Using Tubing)

1" min. <TRAP

OUTLET

2" min.

C00009

Fig. lO-PVC Condensate Trap

d. Make sure that all tools and miscellaneous loose parts have

been renloved.

START-UP

Use the Start-Up Checklist supplied at the end of this book and

proceed as lk_llows:

Step 1--Check for Refrigerant Leaks

LOCATE AND REPAIR REFRIGERANT LEAKS AND

CHARGE THE UNIT AS FOLLOWS:

1. Using both high- and low-pressure ports, locale leaks and

reclaim renmining refrigerant to relieve system pressure.

2. Repair leak lk)llowing accepted practices.

NOTE: Install a liquid-line l]lter drier whenever the system has

been opened lk)r repair.

HIGH-VOLTAGE LOW-VOLTAGE

POWERWIRING WIRING ENTRY

ENTRY HOLE HOLE

Fig. 11--Unit Electrical Connection

COMPRESSOR

CONTACTOR

C00010

TRANSFORMER

0 o

0 (3,

ELECTRIC GROUND INDOOR OUTDOOR FAN MOTOR HIGH

HEATER LUG FAN AND COMPRESSOR VOLTAGE

FUSES RELAY START CAPACITOR LEADS

C00011

Fig. 12--Control Box Wiring

Step 2iStart-Up Cooling Section and Make Adjustments

W,W

Complete the required procedures given in the Pre-Start- Up

section this page belore starting the unit. Do not jumper any

sali:ty devices when operating the unit.

Do not operate the compressor in cooling mode when the

outdoor temperature is below 40 F.

Do not rapid-cycle the compressor. Allow 5 minntes between

"on" cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION

Start and check the unit (or proper cooling control operation as

follows:

1. Place room thermostat SYSTEM switch in OFF position.

Observe that blower motor starts when FAN switch is placed

in ON position and shuts down within 30 seecnnds when FAN

switch is placed in AUTO position.

2. Place SYSTEM switch in COOL position and FAN switch in

AUTO position. Set cooling control below room temperature.

Observe that compressor, outdoor fan, and indoor blower

motors start and that reversing valve shifts. Observe that

cooling cycle shuts down when control setting is satisfied.

Reversing valve (RV) remains energized.

3. Place system switch in HEAT position. Observe that compres-

sor, indoor fan and outdoor fan energize (Reversing Valve is

deenergized in heat pump heating mode). Set control above

room temperature. Observe that heating cycle shuts down

when control setting is satisfied.

4. When using an automatic changeover room thermostat, place

both SYSTEM and FAN switches in AUTO. positions.

Observe that unit operates in Cooling mode when temperature

control is set to "call li)r cooling" (below room temperature),

and unit operates in Heating mode when temperature control

is set to "call lot heating" (above room temperature).

COMPRESSOR ROTATION

On all 3 Phase units it is important to be ceriain compressor is

rotating in the proper direction. To determine whether or not

compressor is rotating in the proper direction:

1. Connect service ganges to suction and discharge pressure

fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge pressure

should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge pressure

does not rise to normal levels:

1. Turn off power to the unit and tag disconnect.

2. Reverse any two of the unit power leads.

3. Turn on power to the unit.

The suction and discharge pressure levels should now move to

their normal start-up levels.

NOTF:: When the compressor is rotation in the wrong direction,

the unit makes an elevated level of noise and does not provide

cooling.

Step a--Refrigerant Charge

Rel]'igerant Charge Amount of rel_'igerant charge is listed on

unit nameplate and in Table 1. Re{i:r to Carrier Rel?'igerant Service

Techniques Manual, Re{?'igerants section. Unit panels lnust be in

place when unit is operating during charging procedure. Unit nmst

operate a minimum of 15 minutes belk_rechecking charge.

NO CHARGE

Re{i:r to Can'ier Refrigerant Service Techniques. Use standard

evacuating techniques. Alter evacuating system, weigh in the

specified amount of re{5"igerant (re{i:r to Table 1).

LOW CHARGE COOLING

Using cooling charging chart (see Fig. 18 22),Vary rel?'igerant

until conditions of the chart are met. Note that charging chart is

difli:rent {?'omthose normally used. Charts are based on charging

the units to the correct superheat {k)r the various operating

conditions. An accurate pressure gauge and temperature-sensing

device is required. Connect the pressure gauge to the service port

on the suction line. Connect temperature sensing device to the

suction line near the colnpressnr and insulate it so that outdoor

ambient temperature does not al_i_ct reading.

GROUND

r LEAD

/SINGLE'PHASE I_- =--

3-PHASE / CONNECTIONS 4-

CONNECTIONS 1TO DISCONNECTI .

TO DISCONNECT1PER NEC L_ - - -

PER NEC | L

UNIT GROUND

_ Z__ BLK- -/

z__ YEL- -/

- z_- BLU- -/

Fig. 13--Line Power Connections C00012

THERMOSTAT

AND SUBBASE

L..__

L_.__.

_BRN--

-_ ORN --

_RED --

"_ GRN --

UNIT CONTROL POWER

SPLICE BOX

Fig. 14--Control Connections C99056

TO USE THE COOLING CHARGING CHART

This metllod is to be used in cooling mode only. Take tile outdoor

ambient temperature and read the suction pressure gauge. Reli:r to

charts to determine what the suction temperature should be. If

suction temperature is high, add rcl_'igerant. If suction temperature

is low, carefldly recover some of the charge. Recheck the suction

pressure as charge is adjusted.

Example: (See Fig. 18)

Outdoor Temperature 85°F

Suction Pressure--74 psig

Suction Temperature should be--60°F

Note--Suction Temperature may vary +/- 5°F.

HEATING MODE CHARGE

Do not attempt to adjust charge by cooling methods while in heat

pump heating mode. Recover refrigerant and weigh in according to

unit data plate relhigerant data.

Step 4--Indoor Airflow and Airflow Adjustments

NOTE: For cooling operation, the recommended airflow is 350 to

450 cfln per each 12,000 Bmh of rated cooling capacity.

Table 4 shows dry coil air delivery liar horizontal discharge units.

Tables 5-7 show pressure drops.

NOTE: Be sure that all supply- and return-air grilles are open,

free fi'om obstructions, and adjusted properly.

Disconnecl elech'ical power to the unil and inslall lockonl lag

before changing blower speed. Electrical shock can cause

serious injury or dealh.

To change the speed of the indoor Ian motor (IFM), remove the fan

motor speed leg lead fi'om the indoor fan relay (IFR) with units

030, 042, 048 & 060 or the time delay relay (TDR) on 036 size and

replace with lead lor desired blower motor speed, lnsuh_te the

removed lead to al,oM col/act l_ith chassis parts.

FOR 460-V MOTORS

The motor leads are color coded as lbllows:

3-SPEED (060 ONLY) 2-SPEED

black = high speed black = to purple

yellow = line

orange = medium speed purple = to black

blue = low speed red = line

To change the speed of the indoor tim motor (1FM) from low speed

to high speed, remove the red lead from the indoor-fan relay (IFR).

ON 2 Speed Motors: Insulate the red lead to avoid contact with

any chassis parts. Separate the black lead fi'om the purple lead.

Connect the black lead to the IFR. Insulate the purple lead to avoid

contact with any chassis parts. ON 3-Speed Motors: remove the

fan motor speed leg lead freln the indoor (indoor) fan relay (1FR)

and replace with lead liar desired blower motor speed.

Step 5--Unit Controls

All compressors have die Ibllowing internal-protection controls.

HIGH-PRESSURE RELIEF VALVE

This valve opens when the pressure differential between the low

and high side becomes excessive.

Airflow can be changed by changing the lead connections of the

blower motor.

Units 50ZH 036, 048, and 060 blower motors are factory wired li)r

low speed operation. Units 50ZH030 and 042 are factory wired li)r

medium speed operation.

LOSS OF CHARGE SWITCH

Located on the outdoor liquid line is a low-pressure switch which

functions as a loss-of-charge switch. This switch contains a

Schrader core depressor. This switch opens at 7 psig and closes at

22 psig. No adjusm_ent is necessary.

FOR 208/230-V

The motor leads are color-coded as lk_llows:

3-SPEED 2-SPEED

black = high speed black = high speed

blue = medium speed

red = low speed red = low speed

COMPRESSOR OVERLOAD

This overload interrupts power to the compressor when either the

current or internal temperature become excessive, and automati-

cally resets when the internal temperature drops to a sale level.

This overload may require up to 60 minutes (or longer) to reset;

therelore, if the internal overload is suspected of being open,

disconnect the electrical power to the unit and check the circuit

througla the overload with an ohnnneter or continuity tester.

(SEE NOTE#2]

NOTES

LOAD SIDE TRAM

XcB o

YEL DFT

PNK LPS

RN = ORN 'BLU_BLU _ZJ _

WHTI RED RED SEE ACCESSORY HEATER LABEL

II_.... _ BRN_<__ BRN_ W-HT _

BRN _ i i

24V _PxL ICE

COMPRESSOR BELAY

2,SEE PRICE PAGES FOR THERMOSTAT (TI,T2)

AND SUBBASE PART NUMBERS. C10 15 SEC cT1 T+6 MIN,

3.SET HEAT ANTICIPATOR AT .B

4,USE 75_C COPPER CONDUCTORS ONLY, CLOSES OPENS

[TSTAT)

BRN_EL_E_ COMPONENT ARRANGEMENT

INDOOR FAN

_I_ 41_I='Iml ' _ _LE_BLK_GRN ...........YE ELjIGNDBLL_..........

...........I

ACcON_sE_TIONoNB_yX I( 'CMAPC2Ap iFCMAPIA p

DISCONNECTIIT_ 24V POWER ENTRY _ _ _

__IL_I LCJ L_

FAN BEOUENCE

TDR

oT T+BO

ENERG]ZED OE ENERGIZED

DEFROST CYCLE

OFT

OF%OF

L o T T=30 T+IO M[N

LAST DEFROST T=50 MAXIMUM

CYCLE T=90

LEGEND

FIELD SPLICE C CONTACTOR,COMPRESSOR

CAP CAPACITOR

MARKED WIRE CB CIRCUIT BREAKER

TERMINAL (MARKEO) COMP COMPRESSOR MOTOR

CTB COMPRESSOR T[ME BELAY

0 TERMINAL (UNMARKED) EQUIP EQUIPMENT

E_ TERMINAL BLOCK FU FUSE

GNB GROUND

@ SPLICE DB DEFROST BOARD

(_@ SPLICE (MARKED) OFT DEFROST THERMOSTAT

OR OEFROST RELAY

PLU@ IFR INDOOR FAN RELAY

RECEPTACLE IFM INDOOR FAN MOTOR

LPS LOW PRESSURE SWITCH

-- FACTORY WIRING OFM OUTOOOR FAN MOTOR

I I F[ELD CONTROL WIRING PL PLUO

RVS REVERSING VALVE SOLENOID

I FIELD POWER WIRING SB SLOW BLOW FUSE

TDR TIME OELAY RELAY

Ill ACCESSORY OR OPTIONAL WIRING TRAN TRANSFORMER

TO INDICATE COMMON

POTENTIAL ONLY:

NOT TO REPRESENT WIRING

Fig. 15--208/230-3-60 Wiring Diagram

A06055

SCHEMATIC

- _ 480 3 80 OFR --

......... IELD _ ....... _C_ .... r ......

p BLK _ C CAP2

I_LT_YEL_r'__'¥ELI------7_YEL_ YEL_BRN_

LSU____I_._BLu_il--------_E'L| OT_

yOLU_ i /I ..... __

USED WITH _ BLU COMP

C.... r BLK:41 I I I YEL '

5,10,15 _ 20 KW _ YEL i BLU

SIZE 2 AW8 _BLU i RED

L, .............._-----fl--OLU--_--RED =_IO=_

SEE ELECTRIC _ _ i BLK_)IF _............. i YEL _ IFM

.... ......

_ |....... _EL J-._

IBLK'

.................... _ .,,I-- ...... --_

LOAD SIDE _ CB _

FRED--CX: ........

24V 8SOPXLICE

THERMOSTAT SUB BASE

FAN _°N ,

H_ _

(SEE NOTE_2)

m -

_ _ _ _ _ _ _ _ _ _BRN_

2SEE PRICE PAGES FOR THERMOSTAT

AND SUBBASEPART NUMBERS.

3SET HEAT ANTICIPATOR AT .8

4USE 75"C COPPER CONDUCTORSONLY.

COMPRESSOR DELAY

OTO_(TI,T2)

0 .5 SEC T T+5 MIN.

ol #_

CLOSES 0 NS

ITSTAT)

FAN SEQUENCE

TDR(1,3)

0 T T+BO

...._........ gR.....

BRNYELBLK_ COMPONENT ARRANGEMENT

DI_SCONNECT/_ ............. _ r_l r_l

PER NEC --

%TRAM

SPLICE

DEFROST CYCLE

OFT

OFI,OF_

L o T T=30 T+IO MIN

LAST DEFROST T=50 MAXIMUM

CYCLE T=90

LEGEND

FIELD SPLICE C CONTACTOR, COMPRESSOR

CAP CAPAC[TOR

MARKED WIRE CB C[RCU[T BREAKER

TERMINAL (MARKED) COMP COMPRESSOR MOTOR

CTD COMPRESSOR TIME DELAY

0 TERMINAL (UNMARKED) EQUIP EQU[PMENT

TERMINAL BLOCK GNO GROUND

DB DEFROST BOARD

@SPL]CE OFT DEFROST THERMOSTAT

(_o SPLICE (MARKED) DR DEFROST RELAY

PLUG IFM INDOOR FAN MOTOR

LPS LOW PRESSURE SWITCH

RECEPTACLE OFM OUTDOOR FAN MOTOR

-- FACTORY W[RIN8 OFR OUTDOOR FAN RELAY

PL PLUG

-- -- F]ELD CONTROL WIRIN8 QT QUADRUPLE TERMINAL

F]ELD POWER WIRING RVS REVERSING VALVE SOLENOID

TRAM TRANSFORMER

_m_ ACCESSORY OR OPTIONAL WIRING

TO ]NOICATE COMMON

POTENTIAL ONLY:

NOT TO REPRESENT WIRING

Fig. 16--460-3-60 Wiring Diagram

A06056

C _ = BRN(COMMON=)

Wl_ - -VLO-[S-TE-P-2L

w1_,i = VV_T_SZEPJ ).....

UNIT POWER

WIRING

FUSE BLOCK -

L24Z -, IYE'

t -, olBLK"

Step 6--Sequence of Operation

m q

i CONTACTOR2

CONTACTOR 1

YELl_ m _IYEL

F °!

AYTO-LIMIT BLK

C00014

Fig. 17--Accessory Electric Heater Wiring

FAN OPERATION

The FAN switch on the thermostat controls indoor fan operation.

When the FAN switch is placed in the ON position, the IFR

(indoor-fan relay) is energized through the G terminal on the

thermostat. The normally-open contacts close, which then provide

power to the indoor (evaporator) fan motor (IFM). The 1FM will

run continuously when the FAN switch is set to ON.

When the FAN switch is set to AUTO, the thermostat deenergizes

the IFR (provided them is not a call li)r cooling). The contacts ()pen

and the ]FM is deenergized. The 1FM will be energized only when

them is a call lot cooling, in heat pump heating mode or if the unit

is equipped with accessory electric heat, the indoor-fan motor will

also run while the accessory electric heat is energized.

NOTE: Some units are equipped with a time-delay relay. On

these units, the indoor lhn renmins on li)r 30 seconds alter G or Y

is deenergized.

COOLING

With the thermostat subbase in the cooling position, the thermostat

makes circuit R-O. This energizes the reversing valve solenoid

(RVS) and places the unit in standby condition R(r cooling.

NOTE: The defrost control board has a 5 minute compressor

anti-short cycle time delay built in between compressor starts.

On a call lor cooling, tile compressor contactor (C) and the IFR are

energized through the Y and G terminals of the thermostat.

Energizing the compressor contactor supplies power to the com-

pressor and the outdoor (condenser) fan motor (OFM). Energizing

the 1FR provides power to the IFM.

When the need fi)r cooling has been satisfied, the OFM, compres-

sor, and IFM (FAN on AUTO) are deenergized. If the unit is

equipped with a 30-second delay (036 size only), the indoor fan

will renmin energized li)r 30 seconds alter the compressor is

deenergized. The reversing valve solenoid renmins energized.

HEAT PUMP HEATING

On a call for heat, thernmsmt makes circuits R-Y and R-G. When

compressor time delay (5-minute _+2 minutes) is completed, a

circuit is made to C, starting COMP and OFM. Circuit R-G also

energizes 1FR and starts IFM after l-second delay.

Should room temperature continue to fall, circuit R-W is nmde

through second-stage thermostat bulb. If optional electric heat

package is used, a relay is energized, bringing on first bank of

supplemental electric heat. When thermostat is satisfied, contacts

open, deenergizing contactor and relay; motors and heaters deen-

ergize. The 1FM may be controlled by a tin(e-delay relay that keeps

the fan on fl)r 30 seconds.

DEFROST

Deli'ost board (DB) is a time and temperature comrol, which

includes a field-selectable time period between checks fl)r deli'ost

(30, 50 and 90 ndnutes). The time period is li_ctory-set at 30

minutes and should only be adjusted by a trained service person.

Electronic timer and delh)st cycle start only when contactor is

energized and defi'ost thermostat (DFT) is closed.

Deli'ost mode is identical to Cooling (((ode. The outdoor fan motor

stops because of "OFI" and "OF2" contacts opening on the defrost

board, a bank of optional electric heat turns on to warm air

supplying the conditioned space.

ELECTRIC RESISTANCE HEATING

If accessory electric heaters are installed, on a call fl)r "Emergency

Heat" the thermostat energizes W which energises the heater mlay

and in turn energizes the electric healers. The IFR is energized

which starts the indoor-fan motor. If the heaters are staged, W2 is

energized when the second stage of heating is required. When the

need fl)r heating is satislied, the heater and IFM are deenergized.

MAINTENANCE

To ensure continuing high perR(rnmnce, and to reduce the possi-

bility of premature equipment failure, periodic nmintenance nmst

be perli.)rmed on this equipment. This cooling unit should be

inspected at least once each year by a qualil]ed service person. To

troubleshoot cooling of units, reler to Troubleshooting chart in

back of book.

NOTE TO EQUIPMENT OWNER: Consult your local dealer

about the availability of a maintenance contract.

Table 3--Electrical Data--50ZH

UNiT 50ZR

SIZE

(-SERIES, IF

USED)

O3O

036

042

048

060

VOLTAGE

RANGE OFM IFM

V-PH-HZ

208/230-3-8

208/230-3-80

480-3-60

208/230-3-80

460-3-80

208/230-3-80

460-3-80

208/230-3-80

480-3-80

MIN

187

414

187

414

187

414

187

414

(See legend following Electrical Data charts)

COMPRESSOR

FLA

LRA FLA

ELECTRIC HEAT

Nominal KW* FLA

-/-

10.4/12.0

20.8/24.1

31.3/36.1

-/-

10.4/12.0

20.8/24.1

31.3/36.1

6.0

12.0

18.0

-/-

10.5/12.0

20.8/24.1

31.4/36.1

41.4/47.9

6.0

12.0

18.0

24.1

-/-

10.5/12.0

20.8/24.1

31.4/36.1

41.4/47.9

6.0

12.0

18.0

24.1

-/-

10.5/12.0

20.8/24.1

31.4/36.1

41.4/47.9

6.0

12.0

18 .0

23.9

SINGLE POINT POWER SUPPLY

MCA FUSE OR

CKT BKR

35/35

45/50

60/-

25/25

35/35

45/50

60/-

30/30

35/40

50/50

25/25

35/40

50/60

35/35

45/45

60/60

MAX RLA

254 10.0

254 11.4

508 5.7

254 13.9

508 6.8

254 12.8

508 6.4

254 15.9

508 8.0

-/-

3.8/5.0

63.0 1.5 5.8 7.5/10.0

11.3/15.0

-/-

3.8/5.0

77.0 1.5 2.8 7.5/10.0

11.3/15.0

39.0 0.8 1.5 10

-/-

3.8/5.0

88.0 1.5 2.8 7.5/10.0

11.3/15.0

15/20

44.0 0.8 1.5 10

-/-

3.8/5.0

93.0 1.5 4.2 7.5/10.0

11.3/15.0

15/20

46.5 0.8 2.1 10

-/-

3.8/5.0

124.0 3.1 6.2 7.5/10.0

11.3/15.0

14.9/19.9

59.6 1.5 3.2 10

19.9

16.8

29.9/31.8

42.8/46.9

56.1/61.9

18.6/18.6

31.7/33.6

44.6/48.7

57.8/63.7

9.9

16.9

24.4

31.9

21.7/21.7

34.8/36.7

47.7/51.8

60.9/66.8

73.4/81.6

10.8

18.3

25.8

33.3

40.9

21.7/21.70

34.8/36.7

47.7/51.8

61.0/66.8

73.7/81.8

10.9

18.4

25.9

33.4

41.0

29.2/29.2

42.3/44.2

55.2/59.3

68.4/74.3

81.2/89.3

14.7

22.2

29.7

37.2

44.6

MOCP

-/70

70/70

80/90

70/70

80/90

70/80

90/90

LE ENO CQUS

FLA -- Full Load Amps

LRA -- Locked Rotor Amps

MCA -- Minimum Circuit Amps

MOCP -- Maximum Overcurrent Protection

RLA -- Rated Load Amps

CKT BKR -- Circuit Breaker

NOTES:

1. In compliance with NEC (National Electrical Code) requirements

for multimotor and combination load equipment (refer to NEC

Articles 430 and 440), the overcurrent protective device for the

unit shall be Power Supply fuse. Canadian units may be

fuse or circuit breaker.

2. Minimum wire size is based on 60 C copper wire. If other than

60 C wire is used, or if length exceeds wire length in table,

determine size from NEC.

3. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply volt-

age is greater than 2%. Use the following formula to determine

the percentage of voltage imbalance.

% Voltage imbalance

= 100 x max voltage deviation from average voltage

average voltage

EXAMPLE: Supply voltage is 460-3-60.

A B C AB = 452 v

BC = 464 v

AC = 455 v

Average Voltage = 452 + 464 + 455

_ 1371

= 457

Determine maximum deviation from average voltage.

(AB) 457 452=5v

(B0) 464 457=7v

(AC) 457 455 =2v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x --

457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the

maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is

more than 2%, contact your local electric utility company

immediately.

The ability to properly perlbrn_ maintenance on this equip-

ment requires certain expertise, mechanical skills, tools and

equipment. If you do not possess these, do not attempt to

perlbrn_ any maintenance on this equipment, other than those

procedures recommended in the User's Manual. FAILURE

TO HEED THIS WARNING COULD RESULT IN SERI-

OtIS 1NJURY, DEATH OR DAMAGE TO THIS EQUIP-

MENT.

The minilnum maintenance requirements %r this equipment are as

lollows:

1. Inspect air filter(s) each month. Clean or replace when

necessary.

2. Inspect indoor coil, outdoor coil, drain pan, and condensate

drain each cooling and heating season lbr cleanliness. Clean

when necessary.

3. Inspect blower motor and wheel lot cleanliness each cooling

and heating season. Clean when necessary. For l]rst heating

season, inspect blower wheel bimonthly to determine proper

cleaning [?'equency.

4. Check electrical connections lbr tightness and controls lk_r

proper operation each cooling season. Service when neces-

sary.

5. Check the drain channel ilk the top cover periodically %r

blockage (leaves, insects). Clean as needed.

Failure to lollow these warnings could result in serious injury

or death:

1. Turn off electrical power to the unit and install lockout tag

beli_re perlorming any maintenance or service on the unit.

2. Use extreme caution when removing panels and parts. As

with any mechanical equipment, personal injury can result

15"oresharp edges, etc.

3. Never place anything combustible either on, or ilkcontact

with, the unit.

Step 1--Air Filter

NOTE: Never operate the unit without a suitable air lilter ilkthe

return-air duct system. Always replace the l]lter with the same size

as originally installed. See Table 1 lor recommended filter sizes

Inspect air filter(s) at least once each month and replace

(throwaway-type) or clean (cleanable-type) at least twice during

each cooling season or whenever the filters become clogged with

dust and lint.

Replace filters with the same dimensional size and type as

originally provided, when necessary.

Step 2--Unit Top Removal (Outdoor-Coil Side)

NOTE: When perli}rming maintenance or service procedures that

require removal of the unit top, be sure to per%rm all of the routine

maintenance procedures that require top removal, including coil

inspection and cleaning, and condensate drain pan inspection and

cleaning.

Disconnect and tag electrical power to the unit belk}re

removing top. Failure to adhere to this warning could cause

serious injury or death.

Only qualified service personnel should perlorm maintenance and

service procedures that require unit top removah

Reli:r to the lbllowing top removal procedures:

1. Remove 7 screws on unit top cover surface. (Save all screws.)

2. Remove 2 screws on unit top cover flange. (Save all screws.)

3. Lift top l?'om unit carefully. Set top on edge and make sum

that top is supported by unit side that is opposite duct (or

plennm) side.

4. Carefully replace and secure unit top to uniL using screws

removed ilk steps 1 and 2 above, when maintenance and/or

service procedures are completed.

Step 3--indoor Blower and Motor

For hmger lili:, operating economy, and continuing efficiency,

clean accunmlated dirt and grease l?'om the blower wheel and

motor annually.

Disconnect and tag electrical power to the unit bel_re

cleaning the blower wheel. Faihn'e to adhere to this warning

could cause serious injury or death.

To clean the blower wheel:

1. Access the blower assembly as lollows:

a. Remove top access panel.

b. Remove 3 screws that hold blower orifice ring to blower

housing. Save screws.

c. Loosen setscrew(s) which secure wheel to motor shaft.

2. Remove and clean blower wheel as lollows:

m E:: ::ikt:i:Kt=Kt : 41

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207130 -:J, lllillllllll :::lllllllill 1

30 40 50 60 70 80 90

SUCT!ON L!NE TEM PERATURE (°F)

I I IIIII

-1 4 10 16 21 27 32

SUCTION LINE TEMPERATURE (°C)

Fig. 18--Cooling Charging Chart--5OZH030 c°°_63

40 50

SUCTION LINE TEMPERATURE

gi-

11-

40 50 60 70

SUCTION LINETEMPERATURE

30 90

-1 4 10 16 21 27 32

SUCTION LINE TEMPERATURE

0166

II IllIII ._

.683 100-_ _ _ _ _:"

- - UTDOORTEMP = ,-11,--

oF oc

46 -

_ _8 38 :

552 _80

CO IIII III1[

_70 55 13 --

483

__ _-J=N-H =

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I111 I_[[I 1 Jl[ll l[[llJl[

I I I I 11 III I Ill I / I

207 30 IIIll Illlllll

IIII I II

30 40 50 60 70 80 90

164

SUCTION LINE TEMPERATURE (°F)

I I IIIII

-1 4 10 16 21 27 32

SUCTION LINE TEMPERATURE (C)

C00165

Fig. 20--Cooling Charging Chart--50ZH042 Units

[[Ll.L_I II ..........................................£[ 1! °F °C II.

,1108

621 _'90- E _ 95 35

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z60. i

348>o-

................ ,q ,,,,,,

30.

30 40 50 60 70 80 90

SUCTION LINETEMPERATURE

-1 4 10 16 21 27 32

SUCTION LINE TEMPERATURE (°C)

C00167

Fig. 22--Cooling Charging Chart--50ZH060 un ts

a. Lift wheel from housing. When handling and/or cleaning

blower wheel, be sure not to disturb balance weights (clips)

on blower wheel vanes.

b. Remove caked-on dirt from wheel and housing with a

brush. Remove lint and/or dirt accumulations l]'om wheel

and housing with vacuum cleaner, using a soft brush

attachment. Remove grease and oil with a mild solvent.

c. Reassemble blower into housing. Place upper orifice ring

on blower to judge location of the blower wheel. Blower

wheel should be approximately 0.2-in. below bottom of

orifice ring when centered correctly. Be sure setscrews am

tightened on motor and are not on round part of shaft.

d. Set upper orifice ring in place with 3 screws removed in

step 1 above.

e. Replace top access paneh

Step 4--Outdoor Coil, Indoor Coil, and Condensate

Drain Pan

Inspect the outdoor coil, indoor coil, and condensate drain pall at

least once beating and cooling season. Proper inspection and

cleaning requircs the removal of the unit top. See Unit Top

Removal section abole.

Remove all obstructions (including weeds and shrubs) that inter-

Ibm with the airflow through the outdoor coil. Straighten bent fins

with a fin conlb. If coated with dirt or lint, clean the coils with a

vacuum cleaner, using a soft brush attachment. Be careful not to

bend the l]ns. If coated with oil or grease, clean the coils with a

mild detergent-and-water-solution. Rinse coils with clear water,

using a garden hose. Be carclM not to splash water on motors,

Table 4--Dry Coil Air Delivery* Horizontal Discharge

(Deduct 10 percent for 208 Volt Operation)

Unit

030

036

042 t

048 t

080 t

Motor Speed

Low

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

230 AND 460 VOLT

External Static Pressure (in. wg)

Watts/CFM 0,1 0.2 0.3 0,4 0.5 0.8 0.7 0.8

Watts 288 285 282 279 274 268 261

Cfm 875 820 802 734 668 582 478

Watts 390 383 378 369 360 350 340

Cfm 1131 1090 1038 978 917 830 721

Watts 528 520 510 495 480 460 450

Cfm 1891 1338 1285 1200 1115 1018 920

Watts 450 435 420 400 380 335 326 311

Cfm 1231 1218 1204 1120 1008 950 863 751

Watts 470 450 445 410 388 359 338 321

Cfm 1302 1264 1205 1163 1081 940 873 783

Watts 660 635 610 575 540 505 485 460

Cfm 1700 1660 1581 1450 1297 1190 1095 999

Watts 478 458 440 411 378 350 327 317

Cfm 1303 1270 1224 1179 1126 1022 911 816

Watts 481 468 450 438 404 370 338 320

Cfm 1310 1280 1241 1181 1110 1022 943 811

Watts 798 678 647 618 578 540 500

Cfm 1736 1688 1618 1510 1421 1309 1187

Watts 801 760 730 688 650 600

Cfm 1898 1841 1757 1682 1564 1429

Watts

Cfm

Watts 870 842 818 782 696 632

Cfm 2000 1903 1799 1718 1625 1446

Watts 890 850 810 790 735 680 580 480

Cfm 1834 1820 1791 1762 1703 1640 1415 1159

Watts 1040 1018 1000 950 890 835 790 650

Cfm 2230 2102 2025 1960 1901 1855 1752 1468

Watts 1073 1038 1001 958 898 840 800 691

Cfm 2230 2202 2160 2122 2052 1926 1791 1588

0.9

460

1060

570

1333

828

1385

422

950

58O

1121

575

1202

t 480-v motors are 2-speed.

Air delivery values are based on operating voltage of 230-v. or 460-v., dry coil, without filter or electric heater. Deduct wet coil filter, and electric heater pressure drops

to obtain external static pressure availabe for ducting.

Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below

this point.

Dashes indicate portions of the table that are beyond the blower motor capacity or are not recommended.

Table 5--Wet Coil Pressure Drop Table 6--Filter Pressure Drop (In. wg)

UNIT SIZE UNiT FILTER CFM

5OZH SiZE SIZE

50ZH (IN.) 500 600 700 800 900 1000 1100 1200

030 080-042 24x24 0.06 0.07 0.08 0.08 0.09 0.09 0.09 0.10

048, 060 24 x 30

038

042

048

060

AIRFLOW

(CFM)

900

1000

1200

1000

1200

1400

1600

1000

1200

1400

1600

1400

1600

1800

1700

1800

2100

2300

PRESSURE DROP

(IN. WG)

0.08

0.07

0.09

0.11

0.12

0.04

0.08

0.09

0.07

0.08

0.09

0.07

0.08

0.09

0.10

1300 1400

0.11 0.12

0.08 0.09

UNiT FILTER CFM

SIZE SiZE

50ZH (IN.) 1500 1600 1700 1800 1900 2000 2100 2200 2300

030-042 24 x 24 0.14 0.15

048,060 24 x 30 0.10 0.11 0.12 0.13 0.14 0.15 0.18 0.17 0.18

insulation, wiring or air filter(s). For best results, spray outdoor-

coil fins from inside to outside the unit. On units with an outer and

inner outdoor coil, be sure 1o clean between the coils. Be sure to

flush all dirt and debris from the unit base.

Inspect the drain pan and condensate drain line when inspecting

the coils. Clean the drain pan and condensate drain by removing all

lk_reign matter from the pan. Flush the pan and drain tube with

clear water. Do not splash water on the insulation, motor, wiring,

Table 7--Accessory Electric Heat Pressure Drop

0n. wg)

ICFM

"E"E°"wI800I80011000112001140011600118001200012200

5-20 0.06 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25

or air filter(s). If the drain tube is restricted, clear it with a

"plumbers snake" or similar probe device. Ensure that the

auxiliary drain port above the drain tube is also clear.

Step 5--Outdoor Fan

Keep the Outdoor fan l?'ee l?'om all obstructions to ensure

proper cooling operation. Never place articles on top of the

unit. Damage to unit may result.

1. Shut off unit power supply and install lockout tag.

2. Remove outdoor-fan assembly (grille, motor, motor cover,

and fan) by removing screws and flipping assembly onto unit

top cover.

3. Loosen fan hub setscrews.

4. Adjust fan height as shown in Fig. 23 or 24.

5. Tighten setscrews.

6. Replace outdoor-fan assembly.

Step 6--Electrical Controls and Wiring

Inspect and check the electrical controls and wiring annually. Be

slu'e to tmw q_' rite electrical power to rite Httit and in.stall lockout

tag.

Remove the top panel to locate all the electrical controls and

wiring. Check all electrical connections lk_r tightness. Tighten all

screw connections. If any smoky or burned connections are

noticed, disassemble the connectiom clean all the parts, restrip the

wire end and reassemble the connection properly and securely.

I .......

3.125 in.

C00021

Fig. 23--Outdoor-Fan Adjustment (030-048 Size)

,....._flP _.., II I/ }

C02017

Fig. 24--Outdoor-Fan Adjustment (060 Size)

Check to ensure no wires are touching refrigerant tubing or sharp

sheet metal edges. Move and secure wires to isolate l_'om tubing

and sheet metal edges.

Al_er inspecting the electrical controls and wiring, replace all the

panels. Start the unit, and observe at least one complete cooling

cycle to ensure proper operation. If discrepancies are observed in

operating cycle, or if a suspected malluuction has occurred, check

each electrical component with the proper electrical instrumenta-

tion. Reli:r to the unit wiring label when making these checkouts.

NOTE: Reli3r to the Sequence of Operation section, as an aid in

determining proper control operation.

Step 7iRefrigerant Circuit

Inspect all rel}igerant tubing connections and the unit base liar oil

accunmlations annually. Detecting oil generally indicates a rel?'ig-

erant leak.

If oil is detected or if low cooling perIkmnance is suspected,

leak-test all refrigerant tubing using an electronic leak-detector, or

liquid-soap solution. If a rel_'igerant leak is detected, relcr to Check

Ii)r Refl'igerant Leaks section. (See Table of Contents Ii)r page

number.)

If no refl'igeraut leaks are R)und and low cooling perlbrmance is

suspected, reli:r to Rel?'igerant Charge. (See Table of Contents li)r

page number.)

Step 8--Indoor Airflow

The cooling airflow does not require checking unless improper

perlk>rmance is suspected. /[ aproblem eri,_t,_, be .s;uv, that all

.s'ltl)plx'- attd retur;l-air grilles are open and f}'(,e._}'om obstri¢ctions,

attd that the air.filter is clean. When necessary, relier to Indoor

Airflow and Airflow A_[justmeuts section to check the system

airflow.

Step 9--Metering Devices

Rel?'igerant metering devices are fixed orilices and are located in

the inlet header to the indoor and outdoor coils.

Check valves are also located in the liquid lines near the strainers.

The check valves are the smaller of the two components.

Step 10--Lubrication

L'OMPRESSOR The compressor is charged with the correct

amount of oil at the factory.

FAN MOTOR BEARINGS Fan motor bearings are perma-

nently lubricated. No lurtber lubrication of outdoor or indoor fan

motors is required.

Step 11--Liquid Line Strainer

The liquid line strainer (to protect metering device) is made of wire

mesh and is located in the liquid line on the inlet side of the

metering device.

Check valves are also located in the liquid lines near the strainers.

The Strainers are the larger of the two components.

Step 12--High Flow Valves

Located on the cou_pressor hot gas and suction tubes are High

Flow Valves. Large black plastic caps distinguish these valves

with ()-rings located inside the caps. These valves cannot be

accessed lk)r service in the field. Ensure the plastic caps are in

place and tight or the possibility of reI_'igerant leakage could occur.

A Open

B Closed

C Open

D Closed

LEGEND

LCS Loss of Charge Switch

] Acutrol Metering Device

r_ Check Valve indicates direction of

(Arrow flow)

HEATING CYCLE

1. Hot gas from compressor flows through the 4-way valve and is

directed to the cooling liquid line check valve. It is then condensed

and directed through subcooling circuits and out to the strainer

and the check valve in the heating liquid line.

2. The refrigerant then feeds the outdoor coil through the Acutrol

metering device on each circuit.

3. Each circuit evaporates the refrigerant and the circuits are com-

bined in the outdoor header with some of the circuits flowing th rough

the check valve.

4. The refrigerant then flows through the 4-way valve, accumulator,

and back to the compressor.

Fig. 25-Typical Heat Pump Operation, Heating Mode

C95045

80000

OUTDOOR COIL

Check Valves

A Ck)sed

B Open

C Ck)sed

D Open

LEGEND

LCS Loss of Charge Switch

] Acutrol Metering Device

r_ Check Valve (Arrow indicates direction of flow)

LCS

INDOOR COIL

COOLING CYCLE

1. Hot gas from compressor flows through the 4-way valve and is

directed to the heating liquid line check valve. It is then con-

densed and subcooled through converging circuits. Refrigerant leaves

the outdoor coil by way of the strainer and the check valve in the

cooling liquid line.

2. The refrigerant then feeds the indoor coil thR)ugh the Acutrol

metering device on each circuit.

3. Each circuit evaporates the refrigerant and the circuits are com-

bined in the indoor coil header with some of the circuits flowing

through the check valve.

4. The refrigerant then flows through the 4-way valve, accumulator,

and back to the compressor.

Fig. 26-Typical Heat Pump Operation, Cooling Mode

Balance Point Worksheet

C95044

eL)

70000

60000

50000

40000

30000

20000

10000

-10 10 20 30 40

Outdoor Air Temp (Deg F)

Fig. 27-50ZH Balance Point Chart

5O 6O

C01038rev2

SYMPTOM

Compressor and outdoor fan wiJl not start.

Compressor will not start but outdoor fan

runs.

Compressor cycles

(other than normaJJy satisfying thermostat).

Compressor operates continuousJy.

Excessive head pressure.

Head pressure too low.

Excessive suction pressure.

Suction pressure too low.

Compressor runs but

outdoor fan does not.

TabJe 8--TroubJeshooting--CooJing and Heating

CAUSE

Power Failure

Loss of Charge

Switch open

Fuse blown or circuit breaker tripped

Defective thermostat, contractor, transformer, or

control relay

Insufficient line voltage

Incorrect or faulty wiring

Thermostat setting too high

Faulty wiring or loose connections in compressor

circuit

Compressor motor burned out, seized, or internal

overload open

Defective run/start capacitor overload start relay

One leg of 3-phase power dead

Low input voltage

(20 percent low)

Refrigerant overcharge or undercharge

Loss of Charge

Switch open

Defective compressor

Insufficient line voltage

Blocked outdoor coil (cooling)

Defective run/start capacitor, overload or start

relay

Defective thermostat

Faulty outdoor-fan motor or capacitor

Restriction in refrigerant system

Dirty air filter

Unit undersized for load

Thermostat set too low

Low refrigerant charge

Leaking valves in compressor

Frosted outdoor coil with incorrect

defrost operation (heating)

Air in refrigerant system

outdoor coil dirty or restricted

Dirty air filter

Dirty outdoor coil

Refrigerant overcharged

Air in refrigerant system

Outdoor or indoor air restricted

or air is recirculating

Low refrigerant charge

Compressor valves leaking

Restriction in liquid tube

High heat load

Compressor valves leaking

Refrigerant overcharged

Dirty air filter (cooling)

Low refrigerant charge

Metering device or low side restricted

Insufficient indoor airflow (cooling)

Temperature too low in conditioned area (cooling)

Outdoor ambient below 40_'F (cooling)

Field-installed filter-drier restricted

Normally closed contacts on

defrost board open

REMEDY

Call power company

Evaluate unit for possible refrigerant leak

Replace fuse or reset circuit breaker

Replace component

Determine cause and correct

Check wiring diagram and rewire correctly

Lower thermostat setting below room tempera-

ture

Check wiring and repair or replace

Determine cause

Replace compressor

Determine cause and replace

Replace fuse or reset circuit breaker

Determine cause

Determine cause and correct

Recover refrigerant, evacuate system, and re-

charge to capacities shown on nameplate

Evaluate unit for possible refrigerant leak

Replace and determine cause

Determine cause and correct

Determine cause and replace

Replace thermostat

Replace

Locate restriction and remove

Replace filter

Decrease load or increase unit size

Reset thermostat

Locate leak repair, and recharge

Replace compressor

Check defrost time settings. Reset as necessary.

Check defrost temperature switch. Replace as necessary.

Recover refrigerant evacuate system and re-

charge

Clean coil or remove restriction

Replace filter

Clean coil

Recover excess refrigerant

Recover refrigerant evacuate system and re-

charge

Determine cause and correct

Check for leaks, repair and recharge

Replace compressor

Remove restriction

Check for source and eliminate

Replace compressor

Recover excess refrigerant

Replace Filter

Check for leaks repair, and recharge

Remove source of restriction

Increase air quantity

Check filter- replace if necessary

Reset thermostat

Install low-ambient kit

Replace

Check condition of relay on board.

Replace board if necessary.

START-UP CHECKMST

(REMOVE AND STORE IN JOB FILE)

I. PRELiMiNARY iNFORMATiON

Model No .............................................................................................................................................................

Serial No ..............................................................................................................................................................

Date ......................................................................................................................................................................

Technician ...........................................................................................................................................................

Customer Information(Name/Address) ...........................................................................................................................................................

II, PRE-START-UP

Verify that all packing materials have been removed from unit

Verify that condensate connection is installed per installation instructions

Check all electrical connections and terminals for tightness

Check wire proximity to refrigerant tubes and sheet metal edges

Check that indoor (indoor) air filter is clean and in place

Verify that unit installation is level

___ Check fan wheel propeller for location in housing and setscrew tightness

ill. START-UP

Supply Voltage: L1-L2 L2-L3 L3-L1

Compressor Amps: L1 (C) _ L2(S) L3(R)

Indoor Fan Amps: Outdoor Fan Amps:

TEMPERATURE-Cooling Mode

Outdoor Air Temperature: DB WB

Return-Air Temperature: DB WB

Cooling Supply Air: DB WB

PRESSURES-Cooling Mode

Refrigerant Suction psig

Suction Line Temp*

Refrigerant Discharge psig

Discharge Tempt

TEMPERATURE-Heating Mode

Outdoor Air Temperature:

Return-Air Temperature:

Cooling Supply Air:

PRESSURES-Heating Mode

Refrigerant Suction

Refrigerant Discharge

DB WB

psig

Suction Line Temp*

Discharge Tempt

Verify Refrigerant charge using charging tables

Verify that 3-phase scroll compressor is rotating in correct direction.

*Measured at suction inlet to compressor

1-Measured at liquid line leaving outdoor coil

2.3

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4

Tab 6 8 PC 101 Printed in USA Catalog No 50ZH-6SI Pg 24 2-06 Replaces: New

CARRIER Package Units(both Units Combined) Manual L0604601

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