Carrier Heat Pump 50CR User Manual

50CR

Infinityt Single--Packaged Heat Pump Units

With Puron^®(R--410A) Refrigerant

Sizes 024--060

Installation Instructions

NOTE: Read the entire instruction manual before starting the

installation.

NOTE: Installer: Make sure the Owner’s Manual and Service

Instructions are left with the unit after installation.

TABLE OF CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . 2

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

RECEIVING AND INSTALLATION . . . . . . . . . . . . . . . . 2--16

Check Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Identify Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Inspect Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Ground Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Use of Rigging Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Select and Install Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Converting Horizontal Discharge Units to Downflow

A05307

Fig. 1 -- Unit 50CR

(Vertical) Discharge Units . . . . . . . . . . . . . . . . . . . . . . . . . 9

Provide for Condensate Disposal . . . . . . . . . . . . . . . . . . . . . 9

Install Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . 11

High--Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . 11

Routing Power Leads Into Unit . . . . . . . . . . . . . . . . . . . . 11

Connecting Ground Lead to Ground Screw . . . . . . . . . . 11

Routing Control Wires . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Accessory Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Special Procedures for 208--v Operation . . . . . . . . . . . . . 16

PRE--START--UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

START--UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Unit Start--Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17--23

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Check for Refrigerant Leaks . . . . . . . . . . . . . . . . . . . . . . . . 20

Start--Up Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Checking Cooling and Heating Control Operation . . . . . 20

Checking and Adjusting Refrigerant Charge . . . . . . . . . . 22

Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

No Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Low Charge Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

To Use Cooling Charging Charts . . . . . . . . . . . . . . . . . . . 22

Indoor Airflow and Airflow Adjustments . . . . . . . . . . . . 22

Defrost Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Quiet Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Emergency Heat/Cool Mode . . . . . . . . . . . . . . . . . . . . . . . . 22

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24--28

Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Indoor Blower and Motor . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Outdoor Coil, Indoor Coil, and Condensate Drain Pan . . . . 25

Outdoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . . . . 26

Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Metering Devices–TXV & AccuRater Piston . . . . . . . . . . 26

Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

L o s s -- o f -- C h a r g e S w i t c h . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 7

High--Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Copeland Scroll Compressor (Puron Refrigerant) . . . . . . . 27

Refrigerant System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Servicing Systems on Roofs with Synthetic Materials . . . 27

Liquid--Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . 28

Puron (R--410A) Refrigerant Charging . . . . . . . . . . . . . . 28

System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

L o s s -- o f -- C h a r g e S w i t c h . . . . . . . . . . . . . . . . . . . . . . . . . 2 8

Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . 28

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

START--UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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HVACunit

base

HVAC unit

base

Gask eting

inner flange*

Screw

(NOTE A)

Screw

(NOTE A)

Gasketing

inner flange*

*Gasketing

outer flange

*Gasketing

outer flange

Wood nailer*

Flashing field

supplied

Flashing field

supplied

Roof curb*

Insulation(field

supplied)

Insulation(field

supplied)

Roofing material

field supplied

Roofing material

field supplied

Ductwork

field supplied

Ductwork

field supplied

Cant strip

field supplied

Cant strip

field supplied

Roof

*Provided with roof curb

Roof Curb for Small Cabinet

Roof Curb for Large Cabinet

Note A: When unit mounting screw is used,

retainer bracket must also be used.

Note A: When unit mounting screw is used,

retainer bracket must also be used.

Supply opening

(B x C)

BTyp.

CTyp.

R/A

S/A

Gasket around

duct

Short

Support

Insulated

deck pan

Gasket around

outer edge

Insulated

deck pan

Long

Support

Return opening

(B X C)

A05308

ODS CATALOG

NUMBER

UNIT SIZE

IN. (MM)

CPRFCURB006A00

8 (203)

11 (279)

16--1/2 (419)

28--3/4 (730)

30--3/8 (771)

44--5/16 (1126) 45--15/16 (1167)

50CR024 -036

CPRFCURB007A00 14 (356)

CPRFCURB008A00

CPRFCURB009A00 14 (356) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129)

8 (203) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129)

46--1/16 (1169)

50CR042 -060

NOTES:

1. Roof curb must be set up for unit being installed.

2. Seal strip must be applied, as required, to unit being installed.

3. Dimension in ( ) are in millimeters.

4. Roof curb is made of 16--gauge steel.

5. Table lists only the dimensions, per part number, that have changed.

6. Attach ductwork to curb (flanges of duct rest on curb).

7. Insulated panels: 1--in. thick fiberglass 1 lb. density.

8. Dimensions are in inches.

9. When unit mounting screw is used (see Note A), a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or seismic

conditions. This bracket is available through Micrometl.

Fig. 2 -- Roof Curb Dimensions

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MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B

1/4

B-C

1/4

A-C

1/4

C99065

Fig. 3 -- Unit Leveling Tolerances

OPTIONAL

RETURN

AIR

OPTIONAL

SUPPLY

AIR

OPENING

EVAP. COIL

COND. COIL

C99096

Fig. 4 -- Slab Mounting Detail

A06114

Fig. 5 -- Corner Weights (Lbs.)

CORNER WEIGHTS (SMALL CABINET)

CORNER WEIGHTS (LARGE CABINET)

Unit

Total Weight

Corner Weight 1

Corner Weight 2

Corner Weight 3

Corner Weight 4

024

349

030

349

036

373

Unit

Total Weight

Corner Weight 1

Corner Weight 2

Corner Weight 3

Corner Weight 4

042

438

106

177

048

463

127

177

060

499

107

136

186

141

150

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Step 4—Rig and Place Unit

USE OF RIGGING BRACKET

Rigging and handling of this equipment can be hazardous for many

reasons due to the installation location (roofs, elevated structures,

etc.).

Field Installation of Rigging Bracket

1. If applicable, remove unit from shipping carton. Leave top

shipping skid on the unit for use as a spreader bar to prevent

the rigging straps from damaging the unit. If the skid is not

available, use a spreaderbar ofsufficient length to protectthe

unit from damage.

Only trained, qualified crane operators and ground support staff

should handle and install this equipment.

When working with this equipment, observe precautions in the

literature,on tags, stickers,and labelsattached to the equipment,and

any other safety precautions that might apply.

2. Remove 4 screws in unit corner posts.

3. Attach each of the 4 metal rigging brackets under the panel

rain lip (See Fig. 8). Use the screws removed in step 2 above

to secure the brackets to the unit.

Training for operators of the lifting equipment should include, but

not be limited to, the following:

1. Application of the lifter to the load, and adjustment of the

lifts to adapt to various sizes or kinds of loads.

WARNING

2. Instruction in any special operation or precaution.

PROPERTY DAMAGE HAZARD

3. Condition of the load as it relates to operation of the lifting

kit, such as balance, temperature, etc.

Failure to follow this warning could result in personal

injury/death or property damage.

Follow all applicable safety codes. Wear safety shoes and work

gloves.

Rigging bracket MUST be under the rain lip to provide

adequate lifting.

INSPECTION

Prior to initial use, and at monthly intervals, all rigging brackets and

straps should be visually inspected for any damage, evidence of

wear, structural deformation, or cracks. Particular attention should

be paid to excessive wear at hoist hooking points and load support

areas. Brackets or straps showing any kind of wear in these areas

must not be used and should be discarded.

WARNING

PROPERTY DAMAGE HAZARD

Failure to follow this warning could result in personal

injury/death or property damage.

Do not strip screws when re--securing the unit. If a screw is

stripped, replace the stripped one with a larger diameter screw

(included).

WARNING

ELECTRICAL SHOCK HAZARD

Rigging/Lifting of Unit

Failure to follow this warning could result in personal injury

or death.

1. Bend top of brackets down approximately 30 degrees from

the corner posts.

Before installing or servicing system, always turn off main

power to system. There may be more than one disconnect

switch. Turn off accessory heater power switch if applicable.

Tag disconnect switch with a suitable warning label.

2. Attach straps of equal length to the rigging brackets at

opposite ends of the unit. Be sure straps are rated to hold the

weight of the unit (See Fig. 9).

3. Attach a clevis of sufficient strength in the middle of the

straps. Adjust the clevis location to ensure unit is lifted level

with the ground.

WARNING

UNIT FALLING HAZARD

4. After unit is securely in place detach rigging straps. Remove

corner posts, screws, and rigging brackets then reinstall

screws.

Failure to follow this warning could result in personal injury

or death.

Never stand beneath rigged units or lift over people.

WARNING

INTRODUCTION

UNIT FALLING HAZARD

The lifting/rigging bracket is engineered and designed to be

installed only on Small Packaged Products. This bracket is to be

used to rig/lift a Small Packaged Product onto roofs or other

elevated structures.

Failure to follow this warning could result in personal

injury/death or property damage.

When straps are taut, the clevis should be a minimum of 36

inches above the unit top cover.

WARNING

After the unit is placed on the roof curb or mounting pad, remove

the top crating. On 50CR060 units only, 2 wire ties fastened to the

outdoor coils and reversing valve/accumulator assembly must be

cut. Remove the left and front louvered panels and corner post to

access wire ties. The wire tie to be cut on the left is located

approximately 4 in. down the tube sheet. The wire tie to be cut on

the right is located approximately 6 in. down the tube sheet.

PROPERTY DAMAGE HAZARD

Failure to follow this warning could result in personal

injury/death or property damage.

Rigging brackets for one unit use only. When removing a

unit at the end of its useful life, use a new set of brackets.

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DETAIL

C03017

Fig. 8 -- Rigging Bracket Under Unit Rain Lip

A06113

MAXIMUM SHIPPING WEIGHT

UNIT SIZE

50CR024

50CR030

50CR036

50CR042

50CR048

50CR060

372

395

462

485

521

169

179

210

220

236

Fig. 9 -- Suggested Rigging

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Step 5—Select and Install Ductwork

CONVERTING HORIZONTAL DISCHARGE UNITS TO

DOWNFLOW (VERTICAL) DISCHARGE UNITS

Thedesign and installation ofthe ductsystem mustbe in accordance

with the standards of the NFPA for installation of non--residence

type air conditioning and ventilating systems, NFPA 90A or

residence type, NFPA 90B and/or local codes and ordinances.

WARNING

ELECTRICAL SHOCK HAZARD

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

according to ASHRAE (American Society of Heating,

Refrigeration, and Air Conditioning Engineers) recommendations.

Failure to follow this warning could result in personal injury

or death.

Before installing or servicing system, always turn off main

power to system. There may be more than one disconnect

switch.Turn off accessory heater power switch if applicable.

The unit has duct flanges on the supply-- and return--air openings on

the side of the unit.

WARNING

1. Open all electrical disconnects and install lockout tag before

starting any service work.

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury

or death.

2. Remove side duct covers to access bottom return and supply

knockouts.

For vertical supply and return units, tools or parts could drop

into ductwork, therefore, install a 90 degree turn in the return

ductwork between the unit and the conditioned space. If a 90

degree elbow cannot be installed, then a grille of sufficient

strength and density should be installed to prevent objects

from falling into the conditioned space. Units with electric

heaters require 90 degree elbow in supply duct.

NOTE: These panels are held in place with tabs similar to an

electrical knockout.

3. Use a screwdriver and hammer to remove the panels in the

bottom of the composite unit base.

4. Ensure the side duct covers are in place to block off the

horizontal air openings (See Fig. 11).

Step 6—Provide for Condensate Disposal

NOTE: Ensure that condensate--water disposal methods comply

When designing and installing ductwork, consider the following:

with local codes, restrictions, and practices.

1. Allunitsshouldhavefield--supplied filtersor accessory filter

rack installed in the return--air side of the unit.

Recommended sizes for filters are shown in Table 1.

Theunits disposeof condensatethrough a3/4 in.NPT femalefitting

that exits on the compressor end of the unit. Condensate water can

be drained directly onto the roof in rooftop 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

connectiontoprevent thepan fromoverflowing. Primethe trapwith

water. When using agravel apron,make sureit slopesaway fromthe

unit.

2. Avoid abrupt duct size increases and reductions. Abrupt

change in duct size adversely affects air performance.

IMPORTANT: Use flexible connectors between ductwork and

unit to prevent transmission of vibration. Use suitable gaskets to

ensure weather tight and airtight seal.When electricheat isinstalled,

use fireproof 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 extend 24--in. from electric

heater element.

If the installation requires draining the condensate water away from

the unit, install a field--supplied 2--in. trap at the condensate

connection to ensure proper drainage. Condensate trap is available

as an accessory or is field--supplied. 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 from overflowing. Connect a drain

trough using a minimum of field--supplied 3/4 --in. PVC or

field--supplied 3/4 --in. copper pipe at outlet end of the 2 --in. trap

(See Fig. 12). Do not undersize the tube. Pitch the drain trough

downward at aslope ofat least1 in.for every10 ft.of horizontalrun.

Be sure to check the drain trough for leaks. Prime the trap at the

beginning of the cooling season start--up.

3. Size ductwork for max cooling air quantity (400 cfm/ton).

4. Seal, insulate, and weatherproof all external ductwork. Seal,

insulate and cover with a vapor barrier all ductwork passing

through conditioned spaces. Follow latest Sheet Metal and

Air Conditioning Contractors National Association

(SMACNA) and Air Conditioning Contractors Association

(ACCA) minimum installation standards for residential

heating and air conditioning systems.

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

and vibration--isolate duct openings in wall or roof

according to good construction practices.

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Table 1—Physical Data -- Unit 50CR

UNIT SIZE

024

350

030

2--1/2

350

036

373

042

3--1/2

440

048

463

060

499

NOMINAL CAPACITY (ton)

OPERATING WEIGHT (lb.)

Compressor

Scroll

TXV

Refrigerant (R--410A) Quantity (lb.)

REFRIGERANT METERING DEVICE

7.5

9.5

10.8

11.5

14.0

0.038 (Left OD Coil)

0.046 (Right OD Coil)

0.042 (Left OD Coil)

0.052 (Right OD Coil)

ORIFICE OD (in.)

0.035 (2)

0.038 (2)

OUTDOOR COIL

Rows…Fins/in.

Face Area (sq. ft.)

OUTDOOR FAN

Nominal Cfm

2…21

12.3

2…21

12.3

2…21

13.6

2…21

15.4

2…21

17.2

2…21

19.4

2700

2800

3300

Diameter

Motor HP (RPM)

INDOOR COIL

1/8 (825)

1/4 (1100)

Rows…Fins/in.

Face Area (sq. ft.)

INDOOR BLOWER

Nominal Airflow (Cfm)

3…15

3.7

3…15

3.7

4…15

3.7

3…15

4.7

4…15

4.7

4…17

5.7

Comfort

Variable based on Comfort Roll back (see User Interface instructions for more information).

Efficiency

Max

700

800

10x10

1/2

875

1000

10x10

1/2

1050

1200

11x10

3/4

1225

1400

11x10

3/4

1400

1600

11x10

3/4

1750

2000

11x10

Size (in.)

Motor HP (RPM)

HIGH--PRESSURE SWITCH (psig)

650 ± 15

420 ± 25

Cutout

Reset (Auto)

LOSS--OF--CHARGE/LOW--PRESSURE SWITCH

(Liquid Line) (psig)

Cutout

20 ± 5

45 ± 10

Reset (Auto)

Return--Air Filters (in.)*

Throwaway

20x24x1

24x30x1

24x36x1

*Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 ft/minute

for throwaway type or 450 ft/minute for high--capacity type. Air filter pressure drop for non--standard filters must not exceed 0.08 in. wg.

USER

INTERFACE

RETURN

AIR

FROM

POWER

TOP COVER

SOURCE

DISCONNECT

PER NEC*

FROM

GAS LINE

*NEC - NATIONAL ELECTRICAL CODE

A06091

Fig. 10 -- Typical Installation

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CAUTION

UNIT COMPONENT DAMAGE HAZARD

Failure to follow this caution may 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

connections must be in accordance with CSA standard

C22.1 Canadian Electrical CodePart 1 and applicablelocal

codes. Refer to unit wiring diagram.

2. Use only copper conductor for 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. On 3--phase

units, ensure phases are balanced within 2 percent. Consult

local power company for correction of improper voltage

and/or phase imbalance.

Duct Covers

A05301

Fig. 11 -- 50CR with Duct Covers On

4. Insulate low--voltage wires for highest voltage contained

withinconduitwhen low--voltagecontrol wiresare insame

conduit as high--voltage wires.

5. Do not damageinternal componentswhen drilling through

any panel to mount electrical hardware, conduit, etc.

1” (25mm) MIN.

TRAP

OUTLET

2” (50mm) MIN.

ROUTING POWER LEADS INTO UNIT

Use only copper wire between disconnect and unit. The high

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

conduit termination at the duct panel must be watertight. Run the

high--voltage leads through the power entry knockout on the power

entry side panel. See Fig. 6 and 7 for location and size. For

single--phase units, connect leads to the black and yellow wires ; for

3--phaseunits, connectthe leadsto theblack, yellow, and bluewires.

C99013

Fig. 12 -- Condensate Trap

Step 7—Install Electrical Connections

WARNING

CONNECTING GROUND LEAD TO GROUND SCREW

ELECTRICAL SHOCK HAZARD

Connect the ground lead to the chassis usingthe groundscrew inthe

wiring splice box (See Fig. 14 and 17).

Failure to follow this warning could result in personal injury

or death.

ROUTING CONTROL POWER WIRES

The unit cabinet must have an uninterrupted, unbroken

electricalgroundtominimizethepossibility of personalinjury

if an electrical fault should occur. This ground may consist of

an electrical wire connected to the unit ground screw in the

control compartment, or conduit approved for electrical

ground when installed in accordance with NEC, ANSI/NFPA

American National Standards Institute/National Fire

Protection Association (latest edition) (in Canada, Canadian

Electrical Code CSA C22.1) and local electrical codes.

For detailed instruction on the low voltage connections to the User

Interface (UI), refer to the UI installation guide.

Form a drip--loop with thecontrol leadsbefore routingthem intothe

unit. Route the low voltage control leads through grommeted,

low--voltageholeprovidedintounit(SeeFig.6and7). Connectuser

interface leads to unit control power leads as shown in Fig. 14.

The unit transformer supplies 24--v power for complete system

including accessory electrical heater. A fuse is provided in the 24--v

circuit on the control board (See Fig. 19); see the caution label on

the transformer. Transformer is factory wired for 230--v operation.

If supply voltage is 208--v, rewire transformer primary as described

in Special Procedures for 208--v Operation section.

HIGH--VOLTAGE CONNECTIONS

The unit must have a separate electrical service with

field--supplied, waterproof disconnect switch mounted at, or within

sight from the unit. Refer to the unit rating plate, NEC and local

codes for maximum fuse/circuit breaker size and minimum circuit

amps (ampacity) for wire sizing (See Table 2 for electrical data).

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

high--voltage inlet hole (See Fig. 6 and 7).

If the unit has an electric heater, a second disconnect may be

required. Consult the Installation, Start--Up, and Service

Instructions provided with the accessory for electrical service

connections.

Operation of unit on improper line voltage constitutes abuse and

may cause unit damage that could affect warranty.

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Table 2—Electrical Data—50CR

SINGLE POINT POWER

SUPPLY

ELECTRIC HEAT

VOLTAGE

RANGE

V--PH--HZ

COMPRESSOR

OFM

FLA

IFM

FLA

UNIT SIZE

024

NOMINAL

kW*

-- / --

FLA

MCA

MOCP

MIN

MAX

RLA

LRA

-- / --

22.1/22.1

44.6/48.1

54.6/59.6

67.2/74.2

25.1/25.1

47.6/51.1

57.6/62.6

70.2/77.2

29.5/29.5

52.1/55.6

62.0/67.0

74.7/81.6

97.2/107.7

23.7/23.7

36.7/38.7

49.7/53.7

62.7/68.8

35.7/35.7

58.3/61.7

68.2/73.2

80.8/87.8

103.4/113.8

126.0/139.9

27.0/27.0

40.0/42.0

53.0/57.0

66.0/72.1

78.9/86.9

35.0/35.0

57.6/61.1

67.5/72.5

80.2/87.1

102.7/113.2

125.3/139.2

26.8/26.8

39.8/41.8

52.8/56.8

65.9/71.9

78.7/86.7

44.2/44.2

66.8/70.3

76.7/81.7

89.4/96.3

111.9/122.4

134.5/148.4

34.6/34.6

47.6/49.6

60.7/64.7

73.7/79.7

86.6/94.6

30/30

50/50

60/60

70/80

30/30

50/60

60/70

80/80

35/35

60/60

70/70

80/90

100/110

30/30

45/45

50/60

70/70

45/45

70/70

80/80

90/90

110/125

150/150

35/35

50/50

60/60

70/80

80/90

45/45

70/70

80/80

90/90

110/125

150/150

35/35

50/50

60/60

70/80

80/90

60/60

80/90

90/100

100/110

125/125

150/150

40/40

60/60

70/70

80/80

90/100

3.8/5

18.1/20.8

26.0/30.0

36.1/41.7

-- / --

208/230--1--60

187

253

13.5

61.0

0.9

4.3

5.4/7.2

7.5/10.0

-- / --

3.8/5

18.1/20.8

26.0/30.0

36.1/41.7

-- / --

030

15.9

16.9

12.2

73.0

83.0

77.0

5.4/7.2

7.5/10.0

-- / --

3.8/5

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

-- / --

208/230--1--60

208/230--3--60

187

253

0.9

1.6

6.8

5.4/7.2

7.5/10.0

11.3/15.0

-- / --

036

3.8/5.0

7.5/10.0

11.3/15.0

-- / --

10.4/12.0

20.8/24.1

31.3/36.1

-- / --

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

15.0/20.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

72.2/83.3

-- / --

208/230--1--60

208/230--3--60

208/230--1--60

208/230--3--60

208/230--1--60

208/230--3--60

187

253

22.4

15.4

21.3

14.7

26.9

17.6

105.0

88.0

0.9

1.6

1.5

6.8

9.1

042

3.8/5.0

7.2/10.0

11.3/15.0

15.0/20.0

-- / --

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48.0

-- / --

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

15.0/20.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

72.2/83.3

-- / --

109.0

91.0

048

3.8/5.0

7.5/10.0

11.3/15.0

15.0/20.0

-- / --

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48.0

-- / --

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

15.0/20.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

72.2/83.3

-- / --

145.0

123.0

060

3.8/5.0

7.5/10.0

11.3/15.0

15.0/20.0

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48.0

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EXAMPLE: Supply voltage is 230-3-60.

AB = 228 v

BC = 231 v

AC = 227 v

LEGEND

FLA

LRA

MCA

— Full Load Amps

— Locked Rotor Amps

-- Minimum Circuit Amps

228 + 231 + 227

Average Voltage =

MOCP — Maximum Overcurrent Protection

686

RLA

— Rated Load Amps

= 229

NOTES:

Determine maximum deviation from average voltage.

(AB) 229 - 228 = 1 v

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. The CGA (Canadian Gas

Association) units may be fuse or circuit breaker.

(BC) 231 - 229 = 2 v

(AC) 229 - 227 = 2 v

Maximum deviation is 2 v.

2. Minimum wire size is based on 60 C copper wire. I fother than

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

determine size from NE.C.

Determine percent of voltage imbalance.

229

% Voltage Imbalance = 100 x

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.

= 0.8%

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

maximum allowable 2%.

% Voltage imbalance

max voltage deviation from average voltage

= 100 x

IMPORTANT: If the supply voltage phase imbalance is

more than 2%, contact your local electric utility company

immediately.

average voltage

Heater capacity (kW) based on heater voltage of 208v & 240v.

If power distibution voltage to unit varies from rated heater

voltage, heater kW will vary accordingly.

C03014

Fig. 13 -- Electrical Data Legend

User Interface

Infinity Control Board

Outdoor Air Thermistor

(if used)

Humidifier

(Optional)

LEGEND

Field Control-Voltage Wiring

A05302

Fig. 14 -- Control Voltage Wiring Connections

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7.0

A05304

Fig. 15 -- Wiring Schematics--50CR Single Phase

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5.0

A05259

Fig. 16 -- Wiring Schematics--50CR Three Phase

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ACCESSORY INSTALLATION

A. Accessory Electric Heaters

GROUND SCREW

(IN SPLICE BOX)

GROUND

LEAD

Electric heaters may be installed in 50CR per instructions supplied

with electric heater package. See unit rating plate for

factory--approved electric heater kits.

BLK

SINGLE-PHASE

CONNECTIONS

TO DISCONNECT

PER NEC

NOTE: Units installed without electric heat should have a

factory--supplied sheet metal block--off plate installed over heater

opening. This reduces air leakage and formation of exterior

condensation.

YEL

BLU

3-PHASE

CONNECTIONS

B. Outdoor Air Thermistor (OAT)

NOTE: Use copper wire only.

A 2--screw terminal strip is provided for connection of an outdoor

temperature thermistor. This strip is marked OAT.

LEGEND

NEC – National Electrical Code

Field Wiring

NOTE: While the installation of an outdoor temperature sensor

using the Infinity control board OAT terminals is optional, certain

Infinity features (ComfortHeat, electric heat lockout, auto humidity

control) will be lost.

Splice Connections

C99057

Fig. 17 -- Line Power Connections

OAT input is used to supply outdoor temperature data for system

level functions and for temperature display on User Interface.

Using two wires of field--supplied thermostat wire cable, wire one

lead of thermistor to one screw terminal and the other lead to

remaining screw terminal; there is no polarity to be observed. It is

strongly recommended that two wires be used to connect the

thermistor to eliminate noise interference in temperature reading. If

there are not two spare wires available in cable, one wire may be

used to connect thermistor to OAT screw terminal 1 and the other

lead of the thermistor can be wired to 24--vac COM (C) wire. OAT

screw terminal 1 is terminal located closest to the ABCD system

communications and is marked with a small number 1 next to the

terminal strip.

NOTE: Mis--wiring OAT inputs will not cause damage to either

Infinity control or thermistor. If the thermistor is wired incorrectly,

no reading will appear at User Interface. Re--wire thermistor

correctly for normal operation.

C. Humidifier Connections

The Infinity control board terminal marked HUM is provided for

low voltage (24--vac) control of a humidifier. No humidistat is

required as User Interface monitors indoor humidity. When

commanded to operate humidifier, the unit control will energize the

HUM output to turn humidifier on and de--energize HUM output to

turn humidifier off. Wire HUM and C terminals directly to

humidifier as shown in Fig. 14.

SPECIAL PROCEDURES FOR 208--V OPERATION

Be sure unit disconnect switch is open.

A05303

Fig. 18 -- Control Plate

Disconnect the yellow primary lead from the transformer. See unit

wiring label. (See Fig. 15, 16 and 18)

The low--voltage circuit is fused by a board--mounted automotive

fuse placed in series with transformer SEC1 and R circuit. The C

circuit of transformer circuit is referenced to chassis groundthrough

a printed circuit run at SEC2 and metal control board mounting

eyelets. Check to be sure control board is mounted securely using

both factory--installed screws.

Connecttheyellow primary lead to thetransformer terminallabeled

200--v.

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3. Make the following inspections:

a. Inspect for shipping and handling damages, such as

broken lines, loose parts, disconnected wires, etc.

SEC-2

SEC-1

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

unit base. Detecting oil generally indicates a refrigerant

leak. Leak test all refrigerant tubing connections using

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

refrigerant leak is detected, see following Check for

Refrigerant Leaks section.

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

sure that connections are completed and tight.

d. Ensure wires do not touch refrigerant tubing or sharp

sheet metal edges.

e. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

4. Verify the following conditions:

a. Make sure that outdoor fan blade is correctly positioned

in fan orifice (See Fig. 24).

b. Make sure that condensate drain pan and trap are filled

with water to ensure proper drainage.

c. Make sure that all tools and miscellaneous loose parts

have been removed.

MOTOR

5. Compressors are internally spring mounted. Do not loosen

or remove compressor holddown bolts.

A03169

Fig. 19 -- Detail of Printed Circuit Board

PRE--START--UP

6. Each unit system has two Schrader--typeports, onelow--side

Schrader fitting located on the suction line, and one

high--side Schrader fitting located on the compressor

discharge line. Be sure that caps on the ports are tight.

START--UP

WARNING

Step 1—Unit Start--Up

FIRE,EXPLOSION,ELECTRICAL SHOCKHAZARD

NOTE: Always check high-- and low--voltage supply to the unit

components. Check the integrity of the plug receptacle connections

and unit wiring harness prior to assuming a component failure.

Failure to follow this warning could result in personal injury

or death and/or property damage.

1. Follow recognized safety practices and wear protective

goggles when checking or servicing refrigerant system.

2. Do not operate compressor or provide any electric power

to unit unless compressor terminal cover is in place and

secured.

3. Do not remove compressor terminal cover until all

electrical sources are disconnected and tagged.

4. Relieve and recover all refrigerant from system before

touching or disturbing anything inside terminal box if

refrigerant leak is suspected around compressor terminals.

5. Never attempt to repair soldered connection while

refrigerant system is under pressure.

A. LED Description:

LEDs built into Infinityt control board provide installer or service

person information concerning operation and/or fault condition of

the unit control and ECM motor. This information is also available

at the system user interface in text with basic troubleshooting

instructions. Careful use of information displayed will reduce the

need for extensive manual troubleshooting.

The amber LED located at bottom center of control adjacent to

motor harness plug is Motor Status LED and it is labeled MOTOR.

A second amber LED located in upper right center of control

adjacent to System Communications connector (A,B,C,D) is the

System Status LED and it is labeled STATUS. The green LED

labeled COMM is also located adjacent to System Communications

connector, below STATUS LED, and is used as an indicator of

system communications status. Status Codes will be displayed on

the STATUS LED using the following protocol:

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

contains oil and refrigerant under pressure.

7. To remove a component, wear protective goggles and

proceed as follows:

a. Shut off electrical power to unit and install lockout

tag.

b. Relieve and reclaim all refrigerant from system

using both high-- and low--pressure ports.

c. Cut component connecting tubing with tubing

cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs when

necessary. Oil can ignite when exposed to torch

flame.

1. The number of short flashes indicates first digit of code.

2. The number of long flashes indicates second digit of code.

3. A short flash is 0.25 seconds on. A long flash is 1 second on.

4. The time between flashes is 0.25 seconds.

5. The time between last short flash and first long flash is 1

second.

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

proceed as followsto inspectand preparethe unitfor initialstart--up:

6. The LED will be off for 2.5 seconds before repeating code.

B. Control

Start--Up

and

System

Communications

1. Remove all access panels.

Troubleshooting:

2. Read and follow instructions on all DANGER, WARNING,

CAUTION, and INFORMATION labels attached to, or

shipped with unit.

On power up, green COMM LED will be turned off until successful

system communications are established (this should happen within

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10 seconds). Once communications with User Interface are

successful, COMM LED will be lit and held on. At the same time,

amber STATUS LED will be lit and held continuously on until a

request for operating mode is received. The STATUS LED will be

on any time unit is in idle mode.

2. Recheck airflow and system static pressure using User

Interface service screens with access panel in place.

NOTE: Blower motor faults will not cause a lockout of blower

operation. The unit control will attempt to run the blower motor as

long as User Interface maintains a demand for airflow. The unit

control will not operate electric heaters while a fault condition

exists. The unit control communicates with the motor at least once

everyfiveseconds,evenwhenthemotoris idle.If, duringoperation,

the unit control does not communicate with the motor for more than

25 seconds, the motor will shut itself down and wait for

communications to be reestablished.

If, at any time, communications are not successful for a period

exceeding 2 minutes, the Infinity control willonly allow emergency

heating or cooling operation using a common thermostat and the R,

C, Y, O, W terminal strip connections and will display Status Code

16, System Communication Fault, on amber STATUS LED. No

further troubleshooting information will be available at User

Interface until communications are re--established.

D. Using Motor LED in Troubleshooting

If COMM LED does not light within proper time period and status

code is not displayed;

The MOTOR LED is connected to the blower motor

communicationlineand workswith theunit controlmicroprocessor

and the STATUS LED to provide unit operation and

troubleshooting information. When the motor is commanded to

operate, the MOTOR LED will beturned on and willflash each time

instructions are sent to the motor. When the motor is commanded to

stop, the MOTOR LED will be turned off.

1. Check system transformer high-- and low--voltage to be sure

the system is powered.

2. Check fuse on control board to be sure it is not blown. If fuse

is open, check system wiring before replacing it to be sure a

short does not cause a failure of replacement fuse.

If COMM LED does not light within proper time period and status

code is displayed,

If the MOTOR LED is lit, flashing, and the motor is running, or if

the MOTOR LED is off and the motor is stopped, operation is

normal and no motor fault exists.

1. Check system wiring to be sure User Interface is powered

and connections are made A to A, B to B, etc. and wiring is

not shorted. Mis--wiring or shorting of the ABCD

communications wiring will not allow successful

communications.

If the MOTOR LED is lit, flashing, and the motor does not run, or

if the MOTOR LED is off and the motor is running, check the

STATUS LED for the Status Code. Refer to the troubleshooting

instructions for the indicated Status Code in Section E, Unit

Troubleshooting.

NOTE:Shortingormis--wiringlow--voltage systemwiring willnot

cause damage to unit control or user interface but may cause low

voltage fuse to open.

E. Unit Troubleshooting

Unit faults indicated by flashing codes on the amber system

STATUS LED can be resolved using troubleshooting information

provided below. Codes are listed in order of their priority, highest

to lowest. Though multiple faults can exist at any time, only the

highest priority code will be displayed on STATUS LED. Clearing

the indicated fault when multiple faults exist will cause the next

highest priority Status Code tobe flashed.All existingfaults, aswell

as a fault history, can be viewed at User Interface.

C. ECM Motor Troubleshooting

The ECM motor used in this product consists of two parts: the

control module and the motor winding section. Do not assume

motor or module is defective if it will not start. Use the designed--in

LED information aids and follow troubleshooting steps described

below before replacing motor control module or entire motor.

Motor control module is available as a replacement part.

STATUS CODE 45, CONTROL BOARD TEST FAULT

VERIFY MOTOR WINDING SECTION

Unit control has failed internal start--up tests and must be replaced.

No other service procedure will correct.

WARNING

STATUS CODE 37, HEATER OUTPUT SENSED “ON” WHEN

NOT ENERGIZED:

ELECTRICAL SHOCK HAZARD

Unitcontrolisprovided with circuitry to detect presenceof a24--vac

signal on electric heater stage 1 and stage 2 outputs.

Failure to follow this warning could result in personal injury

or death.

After disconnecting power from the ECM motor, wait at least

5 minutes before removing the control section. Internal

capacitors require time to discharge.

If unit control detects a 24--vac signal on either heater stage output

and it is not supplying signal, Status Code 37 will be displayed on

STATUS LED. Unit control will turn off output and command

blower motor to supply an airflow determined to be safe for current

operation mode with electric heaters energized.

Before proceeding to replace a motor control module:

1. Check motor winding section to be sure it is functional.

To find the fault:

1. Stop all system operations at User Interface and check heater

stage 24--vac outputs.

2. Remove motor control module section and unplug winding

plug. Motor shaft should turn freely, resistance between any

two motor leads should be similar and resistance between

any motor lead and unpainted motor end should exceed

100,000 ohms.

2. Disconnect electric heater at power and check heater wiring

for faults. See Status Code 36 for more information.

STATUS CODE 44, MOTOR COMMUNICATION FAULT

3. Failing any of these tests, entire ECM motor must be

replaced.

The MOTOR LED is connected to the blower motor

communicationlineand workswith theunit controlmicroprocessor

and STATUS LED to provide unit operation and troubleshooting

information.

4. Passing all of the tests, motor control module alone can be

replaced.

MOTOR TURNS SLOWLY

When motor is commanded to operate, the MOTOR LED will be

turned on and will flash each time instructions are sent to the motor.

1. Low static pressure loading of blower while access panel is

removed will cause blower to run slowly. Particularly at low

airflow requests. This is normal, do not assume a fault exists.

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When the motor is commanded to stop, the MOTOR LED will be

turned off. The MOTOR LED will not flash to indicate

communications when it is turned off.

2. If symptoms persist, disconnect wiring harness at unit

control board and check for a resistance value greater than

5000 ohms.

3. Check for proper wiring of resistor assembly.

Unit control is constantly communicating with the motor, even

when the motor and MOTOR LED are off. If motor does not

acknowledge receipt of communications, the control will display

Status Code 44 on STATUS LED and continue to try to

communicate with the motor. If motor acknowledges

communication, status code will be cleared.

4. Make sure heater size installed is an approved size for unit

and size installed.

NOTE: Unit control will not operate electric heater until this Status

Code is resolved. If the heater size is set through the User Interface,

the heater will be operated as a single stage heater. If staging is

desired, the IDR value must be read in by the unit control.

If MOTOR LED is lit and flashing and motor does not run:

1. Check the STATUS LED. If STATUS LED is indicating a

Status 44 code, check the motor wiring harness for proper

connection to control and motor receptacles.

STATUS CODE 36, HEATER OUTPUT NOT SENSED WHEN

ENERGIZED

Unitcontrolisprovided with circuitry to detect presenceof a24--vac

signal on electric heater stage 1 and stage 2 outputs.

2. Check motor wiring harness to be sure all wiring complies

with wiring diagram description, makes a complete circuit

from connector to connector, and is not shorted.

If unit control energizes either heater stage and does not detect the

24--vac signal on output, Status Code 36 will be displayed on the

STATUS LED, unit control will continue to energize heater

output(s) and adjust blower operation to a safe airflow level for

energized electric heat stage(s).

3. Check 12--vdc low voltage supply to motor at pins 1 (+) and

2 (--) of motor header connection to unit control.

If all checks are normal, unit control is good and control module on

motor may need replacement. Check motor and Motor Control

Module following the instructions in Section C, ECM Motor

Troubleshooting.

To find the fault:

1. Check for 24--vac on heater stage outputs. Unit control or

sensing circuit may be bad.

Shorted or mis--wiring of the low voltage motor harness wiring will

not cause damage to unit control or to motor control module.

NOTE: It may be useful as an electric heater troubleshooting

procedure to disconnect the system communications to force Status

Code 16 enabling of emergency heat mode. It is difficult to know

which heater output is energized or not energized in normal

operation. When unit is operated in emergency heat mode using

electric heaters, both outputs are energized and de--engergized

together. Terminal strip inputs to control can then be connected R to

W to turn on both electric heat outputs. Heater output sensing

circuits can then be checked to resolve Status Code 36 or 37

problems.

If the MOTOR LED is off, STATUS LED is indicating a Status

Code 44 and motor is running:

1. Disconnect the motor harness at the unit control. If motor

continues to run, unit control is good and control module on

motor may need replacement.

STATUS CODE 25, INVALID MOTOR / MODEL SELECTION

On initial start--up, unit control shall poll motor for its size data and

check unit size data stored in unit control memory.

1. If motor size is incorrect for unit size or size data is invalid,

Status Code 25 will be displayed on STATUS LED.

STATUS CODE 41, BLOWER MOTOR FAULT

If MOTOR LED is lit and flashing and motor does not run:

2. If model size data is missing (as is the case when a

replacement control board is installed), system User

Interface will prompt installer to enter correct model size

from a list of valid sizes.

1. Check STATUS LED. If STATUS LED is indicating Status

Code 41, motor control has detected that the motor will not

come up to speed within 30 seconds of being commanded to

run or that the motor has been slowed to below 250 rpm for

more than 10 seconds after coming up to speed. Motor

wiring harness and unit control are operating properly, do

not replace.

3. If motor size is incorrect for model size, motor must be

replaced with proper size motor. Unit control will not

respond to operation requests until this fault condition is

resolved.

2. Check to be sure that the blower wheel is not rubbing the

housing.

STATUS CODE 26, INVALID HEATER SIZE

On initial power--up, unit control will write into memory electric

heater size as read from heater if heater is provided with Identifier

Resistor (IDR). Heater size must be valid for combination of indoor

and outdoor components installed. Unit control will read IDR value

connected to pins 1 and 2 of heater harness connector. If no resistor

is found, system User Interfacewill promptinstaller toverify thatno

heater is installed. Verifying that this is correct will establish that the

unit is operating without an electric heater accessory. Upon

choosing negative option, installer will be prompted to select heater

size installed from a list of valid heater sizes for unit size installed.

3. Check motor to be sure that the motor shaft is not seized

(motor control module must be removed and electronics

disconnected from windings to perform this check

properly).

4. Check motor windings section following instructions in

Section C, ECM Motor Troubleshooting.

If all these checks are normal, the motor control module may need

replacement.

STATUS CODE 16, SYSTEM COMMUNICATION FAULT

If heater ID resistor value read is invalid, Status Code 26 will be

displayed on STATUS LED.

If, at any time, system communications are not successful for a

period exceeding 2 minutes, the unit control will only allow

emergency heating or cooling operation using a common

thermostat,and theR,C,Y,O,W terminal strip connections and will

display Status code 16 on the amber STATUS LED (see section E,

Emergency Heating and Cooling Modes). No further unit

troubleshooting information will be available at the User Interface

until communications are re--established.

If heater installed is equipped with a resistor connected to pins 1 and

2 of heater harness connector and status code 26 is displayed on

STATUS LED:

1. Check wiring harness connectionsto besure connectionsare

secure.

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Check system wiring to be sure the User Interface is powered and

connections are made A to A, B to B, etc., and wiring is not shorted.

Mis--wiring or shorting of the ABCD communications wiring will

not allow successful communications. Correcting wiring faults will

clear the code and re--establish communications.

NOTE: Once the compressor has started and then has stopped, it

should not be started again until 4 minutes have elapsed. The

cooling cycle remains “on” until the room temperature drops to

point that is slightly below the cooling control setting of the user

interface. Additionally, there is a 5--minute compressor delay built

into the control for heat pump heating mode.

Shortingormis--wiringthelowvoltagesystemwiringwill notcause

damage to unit control or to User Interface but may cause the low

voltage fuse to open.

Step 3—Check for Refrigerant Leaks

Locate and repair refrigerant leaks and charge the unit as follows:

STATUS CODE 46, BROWNOUT CONDITION

1. Use both high-- and low--pressure ports to relieve system

pressure and reclaim remaining refrigerant.

If the secondary voltage of the transformer falls below 15--vac for

a period exceeding 4 seconds, Status Code 46 will be displayed on

STATUS LED and the User Interface will command the control

board to turn off Y output controlling compressor.

2. Repair leak following accepted practices.

NOTE: Install a bi--flow filter drier whenever the system has been

When secondary voltage rises above 17--vac for more than 4

seconds, the brownout condition is cleared and normal system

operation will resume subject to any minimum compressor

off--delayfunctionwhich maybe ineffect. Brownoutdoes notaffect

blower or electric heater operation.

opened for repair.

3. Check system for leaks using an approved method.

4. Evacuate refrigerant system and reclaim refrigerant if no

additional leaks are found.

5. Charge unit with Puron (R--410A) refrigerant, using a

volumetric--charging cylinder or accurate scale. Refer to unit

rating plate for required charge.

STATUSCODE53,OUTDOORAIR TEMPERATURESENSOR

FAULT

If an OAT sensor is found at power--up, input is constantly checked

to be within a valid temperature range. If sensor is found to be open

or shorted at any time after initial validation, Status Code 53 will be

displayed at amber STATUS LED.

Step 4—Start--Up Adjustments

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

section before starting the unit. Do not jumper any safety devices

when operating the unit. Do not operate the unit in cooling mode

when the outdoor temperature is below 40°F (unless accessory

low--ambient kit is installed). Do not rapid cycle the compressor.

Allow 5 min. between “on” cycles to prevent compressor damage.

Check for faults in wiring connecting sensor to OAT terminals.

Using an Ohm meter, check resistance of thermistor for a short or

open condition.

If thermistor is shorted or open, replace it to return the system to

normal operation.If faultis inthe wiringconnections, correctingthe

fault will clear the code and return the system to normal operation.

CHECKING COOLING AND HEATING CONTROL

OPERATION

Start and check the unit for proper control operation as follows:

NOTE: If fault condition is an open thermistor or a wiring problem

that appears to be an open thermistor and the power to the unit is

cycled off, the fault code will be cleared on the next power--up but

the fault will remain and system operation will not be as expected.

Thisisbecauseon power--up, theunit controlcannot discern the

difference between an open sensor or if a sensor is not installed.

1. Place room UI SYSTEM switch or MODE control in OFF

position. Observe that blower motor starts when FAN mode

is placed in FAN ON position and shuts down within 60 sec

(030--060 size) or 30 sec (024 size) when FAN MODE

switch is placed in AUTO position.

Step 2—Sequence of Operation

2. PlacesystemswitchorMODEcontrolinHEAT position.Set

control above room temperature. Observe that compressor,

outdoor fan, and indoor blower motors start. Observe that

heating cycle shuts down when control setting is satisfied.

The packaged heat pump is designed for installation with a

communicating User Interface. This unit will not respond to

commands provided by a common thermostat except under certain

emergency situations described in Step 1—Start--Up.

3. When using an automatic changeover room thermostat,

place both SYSTEM or MODE control and FAN mode

switches in AUTO positions. Observe that unit operates in

cooling mode when temperature control is set to “call for

cooling” (below room temperature), and unit operates in

heating mode when temperature control is set to “call for

heating” (above room temperature).

The User Interface uses temperature, humidity and other data

supplied from indoor and outdoor system components to control

heating or cooling system for optimum comfort. The unit will be

commanded by User Interface to supply airflow. The unit will

operate the indoor blower at requested airflow for most modes.

The nominal requested airflow will be 350 cfm per ton of nominal

cooling capacity as defined by unit size. Actual airflow request will

be adjusted from nominal using indoor and outdoor temperature

and indoor humidity data to optimize the system operation for

occupant comfort and system efficiency. Refer to User Interface

literature for further system control details.

IMPORTANT: Three--phase, scroll compressors are direction

oriented. Unit must be checked to ensure proper compressor

3--phase power lead orientation. If not corrected within 5 minutes,

the internal protector will shut off the compressor. The 3--phase

power leads to the unit must be reversed to correct rotation. When

turning backwards, the difference between compressor suction and

discharge pressures may be dramatically lower than normal.

Airflow during electric heater operation must be greater than a

minimum level for safe operation. If User Interface instructs unit to

turn on electric heat and the requested airflow is less than the

minimum level the unit control will override requested value.

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INDOOR COIL

OUTDOOR COIL

TXV in Metering

Position

LCS

HPS

Bypass

Position

LEGEND

HPS – High Pressure Switch

LCS – Loss of Charge Switch

Accurater Metering Device

Arrow indicates direction of flow

C03011

Fig. 20 -- Typical Heat Pump Operation, Cooling Mode

INDOOR COIL

OUTDOOR COIL

TXV in Bypass

Position

LCS

HPS

Metering

Position

LEGEND

HPS – High Pressure Switch

LCS – Loss of Charge Switch

Accurater Metering Device

Arrow indicates direction of flow

C03012

Fig. 21 -- Typical Heat Pump Operation, Heating Mode

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CHECKING AND ADJUSTING REFRIGERANT CHARGE

When Quiet Shift switch is placed in ON position, and a defrost is

initiated, the following sequence of operation will occur. Reversing

valve will energize, outdoor fan will turn off, compressor will turn

off for 30 sec and then turn back on to complete defrost. At the start

of heating after conclusion of defrost reversing valve will

de--energize, compressor will turn off for another 30 sec, and the

outdoor fan will stay off for 40 sec, before starting in the heating

mode.

The refrigerant system is fully charged with Puron (R--410A)

refrigerant and is tested and factory sealed.

NOTE: Adjustment of the refrigerant charge is not required unless

the unit is suspected of not having the proper R--410A charge. The

charging labeland thetablesshown referto system temperaturesand

pressures in cooling mode only. A refrigerant charging label is

attached to the outside of the service access door. If charge level is

suspect in heating mode, reclaim all refrigerant and charge to

informative plate amount. (This information may be obtained from

the physical data table also.) The charging label and the tables

shown refer to system temperatures and pressures in cooling mode

only. A refrigerant charging label is attached to the outside of the

service access door.

DEFROST

The defrost control is a time/temperature control which includes a

field--selectable time period (DIP switch 1 and 2 on the board)

between defrost cycles of 30, 60, 90, or 120 minutes (factory set at

30 minutes).

To initiate a forced defrost, two options are available depending on

the status of the defrost thermostat.

IMPORTANT: When evaluating the refrigerant charge, an

indicated adjustment to the specified factory charge must always be

very minimal. If a substantial adjustment is indicated, an abnormal

condition exists somewhere in the cooling system, such as

insufficient airflow across either coil or both coils.

If defrost thermostat is closed, speedup pins (J1) must be shorted by

placing a flat head screw driver in between for 5 sec and releasing,

to observe a complete defrost cycle. When the Quiet Shift switch is

selected, compressor will be turned off for two 30 sec intervals

during this complete defrost cycle, as explained previously. When

Quiet Shift switch is in factory default OFF position, a normal and

complete defrost cycle will be observed.

REFRIGERANT CHARGE

The amount of refrigerant charge is listed on the unit rating plate

and/or the physical data table. Refer to the Refrigeration Service

Techniques Manual, Refrigerants Section.

If defrost thermostat is in open position, and speedup pins are

shorted (with a flat head screw driver) for 5 sec and released, a short

defrost cycle will be observed (actual length is dependent upon the

selected Quiet Shift position). When Quiet Shift switch is in ON

position, the length of defrost is 1 minute (30 sec compressor off

period followed by 30 sec of defrost with compressor operation).

On return to heating operation, compressor will again turn off for an

additional 30 sec and the outdoor fan for 40 sec. When the Quiet

Shift is in OFF position, only a brief 30 sec cycle will be observed.

NO CHARGE

Check for leak. Use standard evacuating techniques. After

evacuating system, weigh in the specified amount of refrigerant

(refer to system rating plate).

LOW CHARGE COOLING

Use Cooling Charging Chart (Fig. 22). Vary refrigerant until the

conditions of the chart are met. Note that charging charts are

different from type normally used. Charts are based on charging the

units to correct subcooling for the various operating conditions.

Accurate pressure gauge and temperature sensing devices are

required. Connect the pressure gauge to the service port on the

suction line. Mount the temperature sensing device on the suction

line and insulate it so that the outdoor ambient does not affect the

reading. Indoor air CFM must be within the normal operating range

of the unit.

If it is desirable to observea completedefrost inwarmer weather,the

defrost thermostat must be closed as follows:

1. Turn off power to outdoor unit.

2. Disconnect outdoor fan motor lead from OF2 on control

board (See Fig. 23). Tape to prevent grounding.

3. Restartunitin heating mode,allowing frostto accumulateon

outdoor coil.

4. After

few minutes in heating mode, liquid--line

temperature should drop below closing point of defrost

thermostat (approximately 30°F).

TO USE COOLING CHARGING CHARTS

Take the liquid line temperature and read the manifold pressure

gauges. Refer to the chart to determine what the liquid line

temperature should be.

NOTE: Unit will remain in defrost until defrost thermostat reopens

at approximately 80°F coil temperature at liquid line or remainder

of defrost cycle time.

NOTE: If the problem causing the inaccurate readings is a

refrigerant leak, refer to Check for Refrigerant Leaks section.

5. Turn off power to outdoor and reconnect fan motor lead to

OF2 on control board after above forced defrost cycle.

INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS

NON--COMMUNICATING EMERGENCY COOLING

HEATING MODE

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

from obstructions, and adjusted properly.

This mode ofoperation isprovided onlyin thecase wherethe UIhas

failed or is otherwise unavailable. If communications cannot be

established with the UI, the Infinity control board will enable the

following thermostat input terminals to allow simple thermostatic

control of the 50CR unit:

Unit 50CR utilizes state of the art ECM (Electronic Computated

Motor) ID Blower Motors. See user interface instructions for

detailed information on adjusting airflow.

Step 5—Defrost Control

a. Y & O for cooling

QUIET SHIFT

b. W for electric heat (if applicable)

c. Y for heat pump heat

Quiet Shift is a field--selectable defrost mode, which will eliminate

occasional noise that could be heard at the start of defrost cycle and

restarting of heating cycle. It is selected by placing DIP switch 3 (on

defrost board) in ON position.

The Infinity control will respond to cooling and heating demands

with the maximum safe airflow based on electric heat size (if

applicable) and unit capacity.

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Required Subcooling oF (oC)

Outdoor Ambient Temperature

Required Liquid Line Temperature for a Specific Subcooling (R-410A)

Required Subcooling (^oF) Required Subcooling (^oC)

Model Size

Pressure

(psig)

Pressure

(kPa)

75 (24)

82 (28)

85 (29)

95 (35)

105 (41)

024

030

036

042

048

060

10.3 ( 5.7 )

9.3 ( 5.2 )

17.6 ( 9.8 )

12.8 ( 7.1 )

17.5 ( 9.7 )

13.7 ( 7.6 )

9.8 ( 5.4 )

8.8 ( 4.9 )

16.8 ( 9.3 )

12.7 ( 7.1 )

16.9 ( 9.4 )

13 ( 7.2 )

9.4 ( 5.2 )

8.6 ( 4.8 )

16.5 ( 9.2 )

12.7 ( 7.1 )

16.6 ( 9.2 )

13 ( 7.2 )

9 ( 5 )

8.6 ( 4.7 )

7 ( 3.9 )

14.3 ( 7.9 )

12.6 ( 7 )

14.8 ( 8.2 )

11.5 ( 6.4 )

189

196

203

210

217

224

231

238

245

252

260

268

276

284

292

300

309

318

327

336

345

354

364

374

384

394

404

414

424

434

444

454

464

474

484

494

504

514

524

534

1303

1351

1399

1448

1496

1544

1593

1641

1689

1737

1792

1848

1903

1958

2013

2068

2130

2192

2254

2316

2378

2440

2509

2578

2647

2716

2785

2854

2923

2992

3061

3130

3199

3268

3337

3406

3475

3544

3612

3681

7.8 ( 4.3 )

15.4 ( 8.6 )

12.6 ( 7 )

15.7 ( 8.7 )

14.5 ( 8.1 )

Charging Procedure

1- Measure Discharge line pressure by attaching a gauge to the service port.

2- Measure the Liquid line temperature by attaching a temperature sensing

device to it.

3- Insulate the temperature sensing device so that the Outdoor Ambient

doesn’t affect the reading.

4- Refer to the required Subcooling in the table based on the model size and

the Outdoor Ambient temperature.

5- Interpolate if the Outdoor ambient temperature lies in between the table

values. Extrapolate if the temperature lies beyond the table range.

6- Find the Pressure Value in the table corresponding to the the measured

Pressure of the Compressor Discharge line.

7- Read across from the Pressure reading to obtain the Liquid line

temperature for a required Subcooling

101

103

105

107

108

110

112

114

116

118

119

121

123

124

126

127

129

131

132

134

8- Add Charge if the measured temperature is higher than the table value.

100

102

103

105

107

109

111

113

114

116

118

119

121

122

124

126

127

129

100

102

104

106

108

109

111

113

114

116

117

119

121

122

124

101

103

104

106

108

109

111

112

114

116

117

119

101

103

104

106

107

109

111

112

114

C03027

Fig. 22 -- Cooling Charging Table--Subcooling

Table 3—ECM Wet Coil Pressure Drop (in. wg)

STANDARD CFM (SCFM)

UNIT

SIZE

600

700

800

900

0.012

0.019

–

1000

0.015

0.023

0.014

–

1100

–

1200

–

1300

–

1400

–

1500

–

1600

–

1700

–

1800

1900

2000

2100

024

030

036

042

048

060

0.005

0.007

0.010

–

0.007

0.010

0.018

0.027

0.017

–

0.021

0.032

0.020

0.027

–

0.024

0.037

0.024

0.032

–

0.042

0.027

0.036

–

0.047

0.031

0.041

0.029

–

0.035

0.046

0.032

0.039

0.052

0.036

0.043

0.057

0.040

–

0.063

0.045

0.068

0.049

–

0.053

Table 4—Filter Pressure Drop Table (in. wg)

CFM

FILTER SIZE

500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

20X20X1

24X30X1

24X36X1

0.05 0.07 0.08 0.1 0.12 0.13 0.14 0.15

—

0.05 0.6 0.07 0.07 0.08 0.09 0.1

—

0.06 0.07 0.07 0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.14

Table 5—Electric Heat Pressure Drop Table

Small Cabinet: 024--036

CFM

500

0.00

600

700

0.00

0.02

800

0.00

0.02

0.04

900

0.00

0.04

0.06

1000

0.00

0.02

0.06

0.08

1100

0.00

0.02

0.04

0.08

0.09

1200

0.00

0.03

0.06

0.10

0.11

1300

0.02

0.05

0.07

0.12

0.13

1400

0.04

0.07

0.09

0.14

0.15

1500

0.06

0.08

0.10

0.16

0.17

1600

0.07

0.09

0.11

0.18

0.19

5 kw

7.2 kw

10 kw

15 kw

20 kw

0.00

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Table 6—Electric Heat Pressure Drop Table

Large Cabinet: 042--060

CFM

1100

0.00

0.02

1200

0.00

0.02

0.03

1300

0.00

0.01

0.03

0.04

1400

0.01

0.02

0.04

0.05

1500

0.02

0.03

0.05

0.06

1600

0.03

0.04

0.06

0.07

1700

0.04

0.05

0.07

0.08

1800

0.05

0.06

0.08

0.09

1900

0.06

0.07

0.09

0.10

2000

0.07

0.08

0.10

0.11

2100

0.08

0.09

0.11

0.12

2200

0.09

0.10

0.12

0.13

2300

0.10

0.11

0.13

0.14

2400

0.11

0.12

0.14

0.15

2500

0.12

0.13

0.15

0.16

5kw

7.2 kw

10 kw

15 kw

20 kw

CESO130076–00

Speedup

Pins

Quiet

Shift

Defrost interval

DIP switches

Fig. 23 -- Defrost Control

MAINTENANCE

WARNING

To ensure continuing high performance, and to minimize the

possibility of premature equipment failure, periodic maintenance

must be performed on this equipment. This heat pump unit should

be inspected at least once each year by a qualified service person. To

troubleshoot unit, refer to Table 8, Troubleshooting Chart.

ELECTRICAL SHOCK HAZARD

Failure to follow these warnings could result in serious injury

or death:

1. Turn off electrical power to the unit before performing any

maintenance or service on this unit.

NOTE TO EQUIPMENT OWNER: Consult your local dealer

about the availability of a maintenance contract.

2. Use extreme caution when removing panels and parts.

3. Never place anything combustible either on or in contact

with the unit.

WARNING

PERSONAL INJURY AND UNIT DAMAGE HAZARD

Failure to follow this warning could result in personal injury

or death and possible unit component damage.

CAUTION

The ability to properly perform maintenance on this

equipment requires certain expertise, mechanical skills, tools

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

perform any maintenance on this equipment, other than those

procedures recommended in the Owner’s Manual.

UNIT OPERATION HAZARD

Failure to follow this caution may resultin equipmentdamage

or improper operation.

Errors made when reconnecting wires may cause improper

and dangerous operation. Label all wires prior to

disconnecting when servicing.

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The minimum maintenance requirements for this equipment are as

follows:

Step 4—Outdoor Fan

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

necessary.

CAUTION

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

cooling season for cleanliness. Clean when necessary.

UNIT OPERATION HAZARD

Failure to follow this caution may result in damage to unit

components.

3. Inspect blower motor and wheel for cleanliness each cooling

season. Clean when necessary.

Keep the condenser fan free from all obstructions to ensure

proper cooling operation. Never place articles on top of the

unit.

4. Check electrical connections for tightness and controls for

proper operation each cooling season. Service when

necessary.

1. Remove 6 screws holding outdoor grille and motor to top

cover.

Step 1—Air Filter

IMPORTANT: Never operate the unit without a suitable air filter

in the return--air duct system.Always replacethe filterwith thesame

dimensional size and type as originally installed. See Table 1 for

recommended filter sizes.

2. Turn motor/grille assembly upside down on top cover to

expose fan blade.

3. Inspect the fan blades for cracks or bends.

4. If fan needs to be removed, loosen setscrew and slide fan off

motor shaft.

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

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

each cooling season and twice during the heating season, or

whenever the filter becomes clogged with dust and lint.

5. When replacing fan blade, position blade so that the hub is

1/8 in. away from the motor end (1/8 in. of motor shaft will

be visible) (See Fig. 24).

Step 2—Indoor Blower and Motor

6. Ensure that set screw engages the flat area on the motor shaft

when tightening.

NOTE: All motors are pre--lubricated. Do not attempt to lubricate

these motors.

7. Replace grille.

For longerlife, operatingeconomy, andcontinuing efficiency,clean

accumulated dirt and grease from the blower wheel and motor

annually.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

Infinity Top

A06035

Disconnect and tag electrical powerto theunit beforecleaning

and lubricating the blower motor and wheel.

“A” DIMENSION

UNIT SIZE

Infinity

024

030

036

042

048

060

Step 3—Outdoor Coil, Indoor Coil, and Condensate

Drain Pan

Inspect the condenser coil, evaporator coil, and condensate drain

pan at least once each year.

The coils are easily cleaned when dry; therefore, inspect and clean

the coils either before or after each cooling season. Remove all

obstructions, including weeds and shrubs, that interfere with the

airflow through the condenser coil. Straighten bent fins with a fin

comb. If coated with dirt or lint, clean the coils with a vacuum

cleaner, using the soft brush attachment. Be careful not to bend the

fins. If coated with oil or grease, clean the coils with a mild detergent

and watersolution.Rinsecoilswith clearwater, using a garden hose.

Be careful not to splash water on motors, insulation, wiring, or air

filter(s). For best results, spray condenser coil fins from inside to

outside the unit. On units with an outer and inner condenser coil, be

sure to clean between the coils. Be sure to flush all dirt and debris

from the unit base.

Fig. 24 -- Fan Blade Clearance

Step 5—Electrical Controls and Wiring

Inspect and check the electrical controls and wiring annually. Be

sure to turn off the electrical power to the unit.

Remove access panel to locate all the electrical controls and wiring.

Check all electrical connections for tightness. Tighten all screw

connections. If any smoky or burned connections are noticed,

disassemble the connection, clean all the parts, re--strip the wire end

and reassemble the connection properly and securely.

After 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 malfunction has occurred, check

each electrical component with the proper electrical

instrumentation. Refer to the unit wiring label when making these

checks.

Inspect the drain pan and condensate drain line when inspecting the

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

foreign matter from the pan. Flush the pan and drain trough with

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

air filter(s). If the drain trough is restricted, clear it with a “plumbers

snake” or similar probe device.

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Balance Point Worksheet

Based on Entering Indoor Air of 70 Deg. F and Rated CFM

060

048

042

036

030

024

-20

-10

Outdoor Air Temp (Deg F)

C03008

Fig. 25 -- 50CR Balance Point Worksheet

Step 6—Refrigerant Circuit

Inspect all refrigerant tubing connections and the unit base for oil

accumulation annually. Detecting oil generally indicates a

refrigerant leak.

If oil is detected or if low performance is suspected, leak test all

refrigerant tubing using an electronic leak detector, or liquid--soap

solution. If a refrigerant leak is detected, refer to Check for

Refrigerant Leaks section.

If no refrigerant leaks are found and low performance is suspected,

refer to Checking and Adjusting Refrigerant Charge section.

Step 7—Indoor Airflow

Theheating and/orcooling airflowdoes notrequire checkingunless

improper performance is suspected. If a problem exists, be sure that

all supply-- and return--air grilles are open and free from

obstructions, and that the air filter is clean.

Step 8—Metering Devices--TXV & Accurater Piston

This unit uses 2 types of metering devices. The outdoor metering

device is a fixed orifice and iscontained inthe brass--hexbody inthe

liquid line feeding the outdoor coils. The indoor metering device is

a TXV--type device.

Step 9—Pressure Switches

C99097

Pressure switches are protective devices wired into control circuit

(low voltage). They shut off compressor if abnormally high or low

pressures are present in the refrigeration circuit. These pressure

switches are specifically designed to operate with Puron (R--410A)

systems. R--22 pressure switches must not be used as replacements

for the Puron (R--410A) system.

Fig. 26 -- Refrigerant Circuit

Step 10—Loss--of--Charge Switch

This switch is located on the liquid line and protects against low

suction pressures caused by such events as loss of charge, low

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airflow across indoor coil, dirty filters, etc. It opens on a pressure

drop at about 20 psig. If system pressureis abovethis, switchshould

be closed. To check switch:

REFRIGERANT

CAUTION

1. Turn off all power to unit.

2. Disconnect leads on switch.

PERSONAL INJURY, UNIT OPERATION HAZARD

3. Apply ohm meter leads across switch. You should have

continuity on a good switch.

Failure to follow this caution may result in personal injury,

equipment damage or improper operation.

This system uses Puron (R--410A) refrigerant which has

higher operating pressures than R--22 and other refrigerants.

No other refrigerant may be used in this system. Gauge set,

hoses,andrecoverysystemmustbe designedto handlePuron.

If you are unsure, consult the equipment manufacturer.

NOTE: Because these switches are attached to refrigeration system

under pressure, it is not advisable to remove this device for

troubleshooting unless you are reasonably certain that a problem

exists. If switch must be removed, remove and recover all system

charge so that pressure gauges read 0 psi. Never open system

without breaking vacuum with dry nitrogen.

COMPRESSOR OIL

Step 11—High--Pressure Switch

The compressor in this system uses a polyolester (POE) oil, Mobil

3MA POE. This oil is extremely hygroscopic, meaning it absorbs

water readily. POE oils can absorb 15 times as much water as other

oils designed for HCFC and CFC refrigerants. Take all necessary

precautions to avoid exposure of the oil to the atmosphere.

The high--pressure switch is located in the discharge line and

protects against excessive condenser coil pressure. It opens at 650

psig.

High pressure may be caused by a dirty outdoor coil, failed fan

motor, or outdoor air recirculation.

SERVICING SYSTEMS ON ROOFS WITH SYNTHETIC

MATERIALS

To check switch:

POE (polyolester) compressor lubricants are known to cause long

term damage to some synthetic roofing materials.

1. Turn off all power to unit.

2. Disconnect leads on switch.

Exposure, even if immediately cleaned up, may cause

embrittlement (leading to cracking) to occur in one year or more.

When performing any service that may risk exposure ofcompressor

oil to the roof, take appropriate precautions to protect roofing.

Procedures which risk oil leakage include, but are not limited to,

compressor replacement, repairing refrigerant leaks, and replacing

refrigerant components such as filter drier, pressure switch,

metering device, coil, accumulator, or reversing valve.

3. Apply ohm meter leads across switch. You should have

continuity on a good switch.

Step 12—Copeland Scroll Compressor (Puron Refrigerant)

The compressor used in this product is specifically designed to

operate with Puron (R--410A) refrigerant and cannot be

interchanged.

The compressor is an electrical (as well as mechanical) device.

Exercise extreme caution when working near compressors. Power

should be shut off, if possible, for most troubleshooting techniques.

Refrigerants present additional safety hazards.

Synthetic Roof Precautionary Procedure

1. Cover extended roof working area with an impermeable

polyethylene (plastic) drip cloth or tarp. Cover an

approximate 10 X 10 ft area.

2. Cover area in front of the unit service panel with a terry cloth

shop towel to absorb lubricant spills and prevent run--offs,

and protect drop cloth from tears caused by tools or

components.

WARNING

EXPLOSION,FIRE,ELECTRICAL SHOCKHAZARD

Failure to follow this warning could result in personal injury

or death and/or property damage.

3. Place terry cloth shop towel inside unit immediately under

component(s) to be serviced and prevent lubricant run--offs

through the louvered openings in the unit base.

Wear safety glasses and gloves when handling refrigerants.

Keep torches and other ignition sources away from

refrigerants and oils.

4. Perform required service.

5. Remove and dispose of any oil--contaminated material per

local codes.

The scroll compressor pumps refrigerant throughout the system by

the interaction of a stationary and an orbiting scroll. The scroll

compressor has no dynamic suction or discharge valves, and it is

more tolerant of stresses caused by debris, liquid slugging, and

flooded starts. The compressor is equipped with an anti--rotational

device and an internal pressure--relief port. The anti--rotational

device prevents the scroll from turning backwards and replaces the

need for a cycle protector.The pressure--reliefport isa safetydevice,

designed to protect against extreme high pressure. The relief port

has an operating range between 550 and 625 psi differential

pressure.

LIQUID--LINE FILTER DRIER

The biflow filter drieris specifically designed to operate with Puron.

Use only factory--authorized components. Filter drier must be

replaced whenever the refrigerant system is opened. When

removing a filter drier, use a tubing cutter to cut the drier from the

system. Do not unsweat a filter drier from the system. Heat from

unsweating will release moisture and contaminants from drier into

system.

PURON (R--410A) REFRIGERANT CHARGING

The Copeland scroll compressor uses Mobil 3MA POE oil. This

is the only oil allowed for oil recharge.

Refer to unit information plate and charging chart. Some R--410A

refrigerant cylinders contain a dip tube to allow liquid

refrigerant to flow from cylinder in upright position. For

cylinders equipped with a dip tube, charge Puron units with

cylinder in upright position and a commercial metering device in

manifold hose. Charge refrigerant into suction line.

Step 13—Refrigerant System

This step covers the refrigerant system of the 50CR, including the

compressor oil needed, servicing systems on roofs containing

synthetic materials, the filter drier, and refrigerant charging.

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Step 14—System Information

Unit Top

LOSS--OF--CHARGE SWITCH

The loss of charge switch is a protective device wired into control

circuit (low voltage). It shuts off the compressor if abnormally low

pressures are present in the refrigeration circuit.

Defrost

Sensor

NOTE: Because these switches are attached to refrigeration system

under pressure, it is not advisable to remove this device for

troubleshooting unless you are reasonably certain that a problem

exists. If switch must be removed, remove and recover all system

charge so that pressure gauges read 0 psi. Never open system

without breaking vacuum with dry nitrogen.

CHECK DEFROST THERMOSTAT

There is a liquid header with a brass distributor and feeder tube

going into outdoor coil. At the end of one of the feeder tubes, there

isa 3/8--in.OD stubtube approximately3 in.long (SeeFig. 27).The

defrost thermostat should be located on stub tube.

NOTE: There is only one stub tube used with liquid header, and on

most units it is the bottom circuit.

Detail A

The defrost thermostat signals heat pump that conditions are right

for defrost or that conditions have changed to terminate defrost. It

is a thermally--actuated switch clamped to outdoor coil to sense its

temperature. Normal temperature range is closed at 30° ± 3°F and

open at 80° ± 5°F.

TROUBLESHOOTING

See

Detail A

Refer to the Cooling and Heating Troubleshooting Chart (Table 7)

for troubleshooting information.

START--UP CHECKLIST

Use the Start--Up Checklist at the back of this manual.

A06068

Fig. 27 -- Defrost Sensor Location

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HEAT PUMP WITH PURON

REFRIGERATION SECTION QUICK--REFERENCE GUIDE

Puron refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement components are

designed to operate with Puron. Puron refrigerant cylinders are rose colored.

Puron refrigerant cylinders manufactured prior to March 1, 1999, have a dip tube that allows liquid to flow out of cylinder in

upright position. Cylinders manufactured March 1, 1999 and later DO NOT have a dip tube and MUST be positioned upside down

to allow liquid to flow.

Recovery cylinder service pressure rating must be 400 psig. DOT 4BA400 or DOT BW400.

Puron systems should be charged with liquid refrigerant. Use a commercial--type metering device in the manifold hose.

Manifold sets should be 750 psig high side and 200 psig low side with 520 psig low side retard.

Use hoses with 750 psig service pressure rating.

Leak detectors should be designed to detect HFC refrigerant.

Puron, as with other HFCs, is only compatible with POE oils.

Vacuum pumps will not remove moisture from oil.

Only use factory--specified liquid--line filter driers with rated working pressures no less than 600 psig.

Do not install a suction--line filter drier in liquid line.

POE oils absorb moisture rapidly. Do not expose oil to atmosphere.

POE oils may cause damage to certain plastics and roofing materials.

Wrap all filter driers and service valves with wet cloth when brazing.

A Puron liquid--line filter drier is required on every unit.

Do not use an R--22 TXV.

Never open system to atmosphere while it is under a vacuum.

When system must be opened for service, break vacuum with dry nitrogen and replace filter driers.

Do not vent Puron into the atmosphere.

Observe all warnings, cautions, and bold text.

Do not leave Puron suction line driers in place for more than 72 hrs.

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Table 7—Troubleshooting Chart

SYMPTOM

CAUSE

REMEDY

Call power company

Power failure

Fuse blown or circuit breaker tripped

Replace fuse or reset circuit breaker

Defective contactor, transformer, control relay, defrost

board, or high--pressure, loss--

of--charge or low--pressure switch

Replace component

Insufficient line voltage

Determine cause and correct

Check wiring diagram and rewire correctly

Reset UI setting

Compressor and outdoor fan

will not start

Incorrect or faulty wiring

User Interface setting too low/too high

DO NOT bypass this compressor time

delay–wait for 5 minutes until time--delay

relay is de--energized

Units have a 5--minute time delay

Faulty wiring or circuit

Loose connections in compressor

Check wiring and repair or replace

Compressor motor burned out, seized, or

internal overload open

Defective run capacitor, overload, or PTC (positive

temperature coefficient) thermistor

Determine cause

Replace compressor

Compressor will not start but condenser fan

runs

Determine cause and replace

Replace fuse or reset circuit breaker

Determine cause

One leg of 3--phase power dead

Low input voltage (20 percent low)

Determine cause and correct

Three--phase scroll compressor (size 030--

060 unit) has a low pressure differential

Correct the direction of rotation by reversing the

3--phase power leads to the unit

Scroll compressor is rotating in the wrong direction

Recover refrigerant, evacuate system, and re-

charge to capacities shown on rating plate

Refrigerant overcharge or undercharge

Defective compressor

Insufficient line voltage

Blocked outdoor coil

Defective run/start capacitor, overload or start relay

Faulty outdoor fan motor or capacitor

Damaged reversing valve

Restriction in refrigerant system

Dirty air filter

Replace and determine cause

Determine cause and correct

Determine cause and replace

Replace

Determine cause and correct

Locate restriction and remove

Replace filter

Compressor cycles (other than normally satis-

fying) cooling/heating calls

Unit undersized for load

UI temperature set too low/too high

Low refrigerant charge

Decrease load or increase unit size

Reset UI setting

Locate leak, repair, and recharge

Check defrost time settings

Reset as necessary

Check defrost temperature switch

Replace as necessary

Compressor operates continuously

Frosted coil with incorrect defrost operation

Recover refrigerant, evacuate system, and re-

charge

Air in system

Outdoor coil dirty or restricted

Dirty air filter

Clean coil or remove restriction

Replace filter

Dirty indoor or outdoor coil

Refrigerant overcharged

Clean coil

Recover excess refrigerant

Excessive head pressure

Recover refrigerant, evacuate system, and re-

charge

Air in system

(Heat) Indoor air restricted or recirculating

Indoor or outdoor air restricted or air short--cycling

Determine cause and correct

(Continued next page)

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Table 7—Troubleshooting Chart (Cont’d)

SYMPTOM

CAUSE

REMEDY

Low refrigerant charge

Restriction in liquid tube

(Cool) High Heat load

Reversing valve hung up or leaking internally

Refrigerant overcharged

(Cool) Dirty air filter

Check for leaks, repair and recharge

Remove restriction

Check for source and eliminate

Replace valve

Recover excess refrigerant

Replace filter

Head pressure too low

Excessive suction pressure

Move timer on control board to 30 minutes between

defrost cycles

(Heat) Outdoor coil frosted

Low refrigerant charge

Metering device or low side restricted

Check for leaks, repair and recharge

Remove source of restriction

Suction pressure too low

Increase air quantity

Check filter–replace if necessary

(Cool) Insufficient coil airflow

(Cool) Temperature too low in conditioned area

(Cool) Outdoor ambient below 55°F

Filter drier restricted

Reset UI setting

Install low--ambient kit

Replace

NC (normally closed) contacts on defrost board

open

Check condition of relay on board

Replace if necessary

Compressor runs but outdoor fan does not

IFM does not run

Blower wheel not secured to shaft

Insufficient voltage at motor

Properly tighten blower wheel to shaft

Determine cause and correct

Power connectors not properly sealed

Water dripping into motor

Connectors should snap easily; do not force

Verify proper drip loops in connector wires

IFM operation is intermittent

Gently pull wires individually to be sure they are

crimped into the housing

Connectors not firmly sealed

IFM-Indoor Fan Motor

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START-UP CHECKLIST

(Remove and Store in Job File)

I. Preliminary Information

MODEL NO.:_________________________________

SERIAL NO.:__________________________________

DATE:_______________________________________

TECHNICIAN:_________________________________

II. PRE-START-UP (Insert checkmark in box as each item is completed)

( ) VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

( ) REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS

( ) CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS

( ) CHECK GAS PIPING FOR LEAKS (WHERE APPLICABLE)

( ) CHECK THAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE

( ) VERIFY THAT UNIT INSTALLATION IS LEVEL

( ) CHECK FAN WHEEL, AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS

( ) MAKE SURE THAT - (If Applicable) ON 060 SIZE PURON HEATPUMP ONLY, THE TWO WIRE TIES FASTEN

TO THE OUTDOOR COILS AND REVERSING VALVE/ACCUMULATOR HAVE BEEN REMOVED

III. START-UP

ELECTRICAL

SUPPLY VOLTAGE __________________________________

COMPRESSOR AMPS_________________________________

INDOOR (EVAPORATOR) FAN AMPS___________

TEMPERATURES

OUTDOOR (CONDENSER) AIR TEMPERATURE ___________DB

RETURN-AIR TEMPERATURE ___________DB ___________WB

COOLING SUPPLY AIR ___________DB ___________WB

HEAT PUMP SUPPLY AIR ___________

ELECTRIC HEAT SUPPLY AIR ___________

PRESSURES

REFRIGERANT SUCTION ___________PSIG SUCTION LINE TEMP*___________

REFRIGERANT DISCHARGE ___________PSIG DISCHARGE TEMP†___________

( ) VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS

*Measured at suction inlet to compressor

†Measured at liquid line leaving condenser.

A05306

Catalog No: 50CR---1SI

Printed in U.S.A.

Edition Date: 03/06

Replaces: New

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

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