Carrier 50Js Users Manual

50JS to the manual 6989d00c-3bee-46c9-9c46-0510a5127899

2015-01-24

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50JS,JX018-060

Single-Package Heat Pump Units

Installation, Start-Up and Service Instructions

NOTE: Read the entire instruction manual before starting the

installation.

Index

SAFETY CONSIDERATIONS ...............................................1-4

General .................................................................................4

RECEIVING AND INSTALLATION..................................4-15

Check Equipment......................................................................4-5

Identify Unit..............................................................................4

Inspect Shipment.......................................................................5

Provide Unit Support...................................................................5

Roof Curb..................................................................................5

Slab Mount................................................................................5

Ground Mount...........................................................................5

Provide Clearances.......................................................................5

Rig and Place Unit....................................................................5-6

Select and Install Ductwork ....................................................6-8

Converting Horizontal Discharge Units to Downflow (Vertical)

Discharge...................................................................................6

Provide for Condensate Disposal............................................6-8

Install Electrical Connections.....................................................8

High-Voltage Connections........................................................8

Routing Power Leads Into Unit..........................................8-14

Connecting Ground Lead to Ground Lug..............................14

Special Procedures for 208-V Operation...............................15

PRE-START-UP.........................................................................15

START-UP.............................................................................15-20

Check for Refrigerant Leaks ..................................................15

Unit Start-Up Adjustment .................................................15-20

MAINTENANCE ..................................................................20-23

SYSTEM INFORMATION.......................................................23

Time Delay Relay...................................................................23

Pressure Switches....................................................................23

Defrost Thermostat .................................................................23

TROUBLESHOOTING .......................................................24-25

START-UP CHECKLIST.........................................................25

NOTE TO INSTALLER — READ THESE INSTRUCTIONS

CAREFULLY AND COMPLETELY before installing this unit.

Also, make sure the Owner’s Manual and Service Instructions are

left with the unit after installation.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be

hazardous due to system pressure and electrical components. Only

trained and qualified personnel should install, repair, or service

air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of

cleaning coils and filters. All other operations should be performed

by trained service personnel. When working on air-conditioning

equipment, observe precautions in the literature, tags and labels

attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use

quenching cloth for unbrazing operations. Have fire extinguisher

available for all brazing operations.

Improper installation, adjustment, alteration, service, mainte-

nance, or use can cause explosion, fire, electric shock, or

other occurrences, which could cause serious injury or death

or damage your property. Consult a qualified installer or

service agency for information or assistance. The qualified

installer or agency must use only factory-authorized kits or

accessories when modifying this product.

Recognize safety information. This is the safety-alert symbol .

When you see this symbol on the product or in instructions or

manuals, be alert to the potential for personal injury.

Understand the signal words — DANGER, WARNING, CAU-

TION, and NOTE. Danger identifies the most serious hazards,

which will result in severe personal injury or death. Warning

indicates a condition that could cause serious personal injury or

death. Caution is used to identify unsafe 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.

1. The power supply (volts, phase, and hertz) must correspond to

that specified on unit rating plate.

2. The electrical supply provided by the utility must be sufficient

to handle load imposed by this unit.

3. This installation must conform with local building codes and

with NEC (National Electrical Code). Refer to provincial and

local plumbing or waste water codes and other applicable local

codes.

Fig. 1—Model 50JS/JX

C99001

Visit www.carrier.com

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

Book 1 4

Tab 5a 5a PC 101 Catalog No. 565-057 Printed in U.S.A. Form 50JS,JX-1SI Pg 1 5-00 Replaces: 50JX-2SI

UNIT ELECTRICAL CHARACTERISTICS UNIT WEIGHT UNIT HEIGHT

IN. [MM]

"A"

CENTER OF GRAVITY

IN. [MM]

lb kg X Y Z

50JS018 208/230-1-60 283 128.4 37.02 [940.3] 19.5 [495.3] 16.8 [425.5] 15.0 [381.0]

50JS024 208/230-1-60 289 131.1 39.02 [991.1] 18.5 [469.9] 16.8 [425.5] 15.0 [381.0]

50JS030 208/230-1-60, 208/230-3-60 287 130.2 39.02 [991.1] 19.5 [495.3] 17.5 [444.5] 15.0 [381.0]

50JS036 208/230-1-60, 208/230-3-60, 460-3-60 291 132.0 37.02 [940.3] 19.5 [495.3] 17.8 [450.9] 13.0 [330.2]

50JS042 208/230-1-60, 208/230-3-60, 460-3-60 323 146.5 37.02 [940.3] 19.5 [495.3] 17.8 [450.9] 13.0 [330.2]

50JX024 208/230-1-60 299 135.6 41.02 [1041.9] 19.0 [482.6] 18.3 [463.6] 16.0 [406.4]

50JX030 208/230-1-60,208/230-3-60 320 145.2 37.02 [940.3] 20.0 [ 508] 19.3 [ 489.0] 17.6 [447.0]

50JX036 208/230-1-60,208/230-3-60, 460-3-60 328 148.8 37.02 [940.3] 20.0 [508] 19.0 [482.6] 16.5 [419.1]

Fig. 2—50JS018-042/50JX024-036 Unit Dimensions

C99007

REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES [mm]

EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]

POWER ENTRY SIDE....................................................................42.00 [1066.8]

(EXCEPT FOR NEC REQUIREMENTS)

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

SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]

DUCT PANEL .................................................................................12.00 [304.8] *

*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 304.8 [12.00] FROM

WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.

REQUIRED CLEARANCE TO COMBUSTIBLE MATL. INCHES [mm]

TOP OF UNIT...................................................................................14.00 [355.6]

DUCT SIDE OF UNIT.........................................................................2.00 [50.8]

SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]

BOTTOM OF UNIT.............................................................................0.50 [12.7]

ELECTRIC HEAT PANEL .................................................................36.00 [914.4]

NEC. REQUIRED CLEARANCES. INCHES [mm]

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]

UNIT ELECTRICAL CHARACTERISTICS UNIT WEIGHT UNIT HEIGHT

IN. [MM]

"A"

CENTER OF GRAVITY

IN. [MM]

lb kg X Y Z

50JS048 208/230-1-60, 208/230-3-60, 460-3-60 353 160.1 38.98 [990.2] 20.5 [520.7] 20.6 [523.8] 17.0 [431.8]

50JS060 208/230-1-60, 208/230-3-60, 460-3-60 418 189.6 38.98 [990.2] 19.5 [495.3] 19.8 [501.7] 17.0 [431.8]

50JX042 208/230-1-60, 208/230-3-60, 460-3-60 350 158.8 40.98 [1040.9] 21.0 [533.4] 20.5 [520.7] 16.6 [421.6]

50JX048 208/230-1-60, 208/230-3-60, 460-3-60 355 161.0 40.98 [1040.9] 20.0 [508.0] 21.3 [539.8] 18.0 [457.2]

50JX060 208/230-1-60, 208/230-3-60, 460-3-60 428 194.1 42.98 [1091.7] 21.0 [533.4] 20.0 [508.0] 17.6 [447.0]

Fig. 3—50JS048-060/50JX042-060 Unit Dimensions

C99006

REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES [mm]

EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]

POWER ENTRY SIDE....................................................................36.00 [914.0]

(EXCEPT FOR NEC REQUIREMENTS)

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

SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]

DUCT PANEL .................................................................................12.00 [304.8] *

*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 304.8 [12.00] FROM

WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.

REQUIRED CLEARANCE TO COMBUSTIBLE MATL. INCHES [mm]

TOP OF UNIT...................................................................................14.00 [355.6]

DUCT SIDE OF UNIT.........................................................................2.00 [50.8]

SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]

BOTTOM OF UNIT.............................................................................0.50 [12.7]

ELECTRIC HEAT PANEL .................................................................36.00 [914.4]

NEC. REQUIRED CLEARANCES. INCHES [mm]

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]

Before performing service or maintenance operations on

system, turn off main power to unit. Turn off accessory heater

power switch if applicable. Electrical shock could cause

severe injury or death.

Step 1—General

The 50JS and 50JX heat pumps are fully self-contained and

designed for outdoor installation (See Fig. 1). Standard units are

shipped in a horizontal-discharge configuration for installation on

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

(vertical) discharge configurations for rooftop applications.

RECEIVING AND INSTALLATION

Step 1—Check Equipment

IDENTIFY UNIT — The unit model number and serial number

are stamped on the unit identification plate. Check this information

against shipping papers.

3.0" 4.0"

BASE PAN

BOTTOM SUPPLY

0.75"

SIDE PANEL

SUPPORT RIB(S)

COUNTER FLASHING

(FIELD SUPPLIED) NAILER

ROOFING FELT

(FIELD SUPPLIED)

CANT STRIP

(FIELD SUPPLIED)

ROOFING MATERIAL

(FIELD SUPPLIED)

INSULATION

(FIELD SUPPLIED)

SEAL STRIP

(FACTORY SUPPLIED)

A99340

13/16

7/8

END VIEW

SUPPORT B

SUPPORT A (2)

SIDE

(2)

DECK PAN (INSULATED)

17 3/8

TYP. D

46 3/16

44 5/16

1 TYP.

END

(2)

A99320

UNIT SIZE ODS CATALOG NUMBER A

IN. [MM] B

IN. [MM] C

IN. [MM] D

IN. [MM]

50JS018-042 50JX024-036 CPRFCURB006A00 8 [203] 11-27/32 [301] 30-5/8 [778] 28-3/4 [730]

CPRFCURB007A00 14 [356] 11-27/32 [301] 30-5/8 [778] 28-3/4 [730]

50JS048-060 50JX042-060 CPRFCURB008A00 8 [203] 15/27/32 [402] 42-18/ [1070] 40-1/4 [1022]

CPRFCURB009A00 14 [356] 15-27/32 [402] 42-1/8 [1070] 40-1/4 [1022]

Fig. 4—Roof Curb Dimensions

NOTES:

1. Dimensions in [ ] are in millimeters.

2. Roof curb is made of 16 gage steel.

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

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

INSPECT SHIPMENT — Inspect for shipping damage while unit

is still on shipping pallet. If unit appears to be damaged or is torn

loose from its anchorage, have it examined by transportation

inspectors before removal. Forward claim papers directly to

transportation company. Manufacturer is not responsible for any

damage incurred in transit. Check all items against shipping list.

Immediately notify the nearest Carrier Air Conditioning office if

any item is missing. To prevent loss or damage, leave all parts in

original packages until installation.

Step 2—Provide Unit Support

ROOF CURB — Install accessory roof curb in accordance with

instructions shipped with curb (See Fig. 4). Install insulation, cant

strips, roofing, and flashing. Ductwork must be attached to curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical

for a watertight seal. Install gasketing material supplied with the

roof curb. Improperly applied gasketing also can result in air leaks

and poor unit performance.

Curb should be level to within 1/4 in. (See Fig. 5). This is

necessary for unit drain to function properly. Refer to accessory

roof curb installation instructions for additional information as

required.

SLAB MOUNT — Place the unit on a solid, level concrete pad

that is a minimum of 4 in. thick with 2 in. above grade (See Fig.

6). The slab should extend approximately 2 in. beyond the casing

on all 4 sides of the unit. Do not secure the unit to the slab except

when required by local codes.

GROUND MOUNT — The unit may be installed either on a slab

or placed directly on the ground if local codes permit. Place the

unit on level ground prepared with gravel for condensate dis-

charge.

Step 3—Provide Clearances

The required minimum service clearances are shown in Figs. 2 and

3. Adequate ventilation and outdoor air must be provided. The

outdoor fan draws air through the outdoor coil and discharges it

through the top fan grill. 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 36

in. above the unit top. The maximum horizontal extension of a

partial over-hang must not exceed 36 in. For extended overhangs,

provide a minimum clearance of 36 in.

IMPORTANT: Do not restrict outdoor airflow. An air restriction

at either the outdoor-air inlet or the fan discharge may be

detrimental to compressor life.

Do not place the unit where water, ice, or snow from an overhang

or roof will damage or flood the unit. Do not install the unit on

carpeting, tile, or other combustible materials. Slab-mounted units

should be at least 4 in. above the highest expected water and runoff

levels. Do not use unit if it has been under water.

Step 4—Rig and Place Unit

Rigging and handling of this equipment can be hazardous for many

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

etc.)

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 labels attached to the equipment,

and any other safety precautions that might apply.

Follow all applicable safety codes. Wear safety shoes and work

gloves.

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.

INSTALLATION

1. Remove unit from shipping carton. Leave top shipping skid on

the unit as a spreader bar to prevent the rigging straps from

damaging the unit. If the wood skid is not available, use a

spreader bar of sufficient length to protect unit from damage.

2. Position the lifting bracket assembly around the base of the

unit. Be sure the strap does not twist.

3. Place each of the 4 metal lifting brackets into the handholds in

the composite pan.

4. Thread lifting bracket strapping around bottom perimeter of

unit as follows:

a. Open lever of tension buckle (ratchet type).

b. Feed strapping through tension buckle as shown in Fig. 7.

c. Pull strapping through tension buckle unit taut.

d. Snap lever down to lock strap in tension buckle. To release

strapping, squeeze safety latch, lift lever, and pull webbing

outward.

Fig. 5—Unit Leveling Tolerances

C99065

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B B-C A-C

1/4 1/4 1/4

Fig. 6—Slab Mounting Detail

C99096

OPTIONAL

RETURN

AIR

OPENING

OPTIONAL

SUPPLY

AIR

OPENING

EVAP. COIL COND. COIL

Fig. 7—Threading Belt

C99067

HANDHOLD

FEED

HOOK

5. Tighten the tension buckle until it is taut. Lifting brackets

must be secure in the handholds.

6. Attach field-supplied clevis or hook of sufficient strength to

hole in the lifting bracket (See Fig. 8).

7. Attach the 2 safety straps directly to the clevis or hook at the

4 rigging brackets. DO NOT attach the safety straps to the

lifting brackets (See Fig. 8).

8. Position lifting point directly over the unit’s center of gravity.

9. Lift unit. When unit is directly over the roof curb, remove the

2 safety straps. Lower the equipment onto the roof curb.

Step 5—Select and Install Ductwork

The design and installation of the duct system must be 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 ordi-

nances.

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

according to ASHRAE (American Society of Heating, Refrigera-

tion, and Air Conditioning Engineers) recommendations.

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

the side of the unit.

When designing and installing ductwork, consider the following:

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

into ductwork and cause serious injury or death. 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.

1. All units should have field-supplied filters or accessory filter

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

sizes for filters are shown in Tables 1A and 1B.

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 electric heat is

installed, 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.

3. Size ductwork for cooling air quantity (cfm). The minimum

air quantity for proper electric heater operation is listed in

Tables 2A and 2B. Heater limit switches may trip at air

quantities below those recommended.

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) mini-

mum 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.

CONVERTING HORIZONTAL DISCHARGE UNITS TO

DOWNFLOW (VERTICAL) DISCHARGE UNITS

Before performing service or maintenance operations on

system, turn off main power to unit. Turn off accessory heater

power switch if applicable. Electrical shock could cause

serious injury or death.

1. Open all electrical disconnects before starting any service

work.

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

knock outs.

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

bottom of the base pan.

4. Reinstall the side duct covers to block off the horizontal air

openings.

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

electrical knockout.

NOTE: Avoid abrupt duct size increases and reductions. Abrupt

change in duct size adversely affects air performance.

Step 6—Provide for Condensate Disposal

NOTE: Ensure that condensate-water disposal methods comply

with local codes, restrictions, and practices.

UNIT MAXIMUM WEIGHT A B

Size lb. kg. in. mm. in. mm.

50JS018 305 138.4 19.5 495.3 16.75 425.5

50JS024 311 141.1 18.5 469.9 16.75 425.5

50JS030 309 140.2 19.5 495.3 17.50 444.5

50JS036 313 142.0 19.5 495.3 17.75 450.9

50JS042 345 156.4 19.5 495.3 17.75 450.9

50JS048 375 170.1 20.5 520.7 20.62 523.8

50JS060 440 199.6 19.5 495.3 19.75 501.7

50JX024 321 145.6 19.0 482.6 18.25 463.6

50JX030 342 155.2 20.0 508 19.25 489

50JX036 350 158.8 20.0 508 19.0 482.6

50JX042 372 168.8 21.0 533.4 20.5 520.7

50JX048 377 171.0 20.0 508 21.25 539.8

50JX060 450 204.2 21.0 533.4 20.0 508.0

Fig. 8—Suggested Rigging

C99075

PLACE RIGGING BRACKET ASSEMBLY IN 4

HAND HOLES AND INSTALL TIE DOWN STRAP

AROUND PERIMETER OF UNIT AND THROUGH

SPACE IN BRACKET ASSEMBLY

INSTALL SAFETY STRAPS TO

RIGGING CLEVIS AT 4 RIGGING BRACKETS

TIGHTEN STRAPPING SECURELY

WITH TENSION BUCKLE

SEE DETAIL A

DETAIL A

SCALE 0.250

914-137"

(36"-54")

“A”

“B”

Table 1A—Physical Data

UNIT SIZE 50JS018 50JS024 50JS030 50JS036 50JS042 50JS048 50JS060

NOMINAL CAPACITY (ton) 1-1/2 2 2-1/2 2-1/2 3-1/2 4 5

OPERATING WEIGHT (lb) 283 289 287 291 323 353 418

COMPRESSOR QUANTITY 1

TYPE RECIPROCATING COMPRESSOR SCROLL COMPRESSOR

REFRIGERANT R-22

REFRIGERANT METERING DEVICE Accurater ®

Refrigerant (R-22) Quantity (lb.) 5.6 5.2 5.8 7.1 7.6 7.8 8.6

ORIFICE ID (in.) 0.053 0.061 0.068 0.078 0.078 0.088 0.093

ORIFICE OD (in.) 0.040 0.049 2@0.042 2@0.046 2@0.052 2@0.057 2@0.061

OUTDOOR COIL

Rows...Fins/in.

Face Area (sq ft)

1....17

10.2 1....17

12.0 1....17

12.0 2....17

10.3 2....17

11.6 2....17

11.6

OUTDOOR FAN

Nominal Airflow (CFM)

Diameter

Motor HP (RPM)

2400

1/8 (825)

2400

1/8 (825)

2400

1/8 (825)

2800

1/4 (1100)

2400

1/8 (825)

3300

1/4 (1100)

3300

1/4 (1100)

INDOOR COIL

Rows...Fins/in.

Face Area (Sq Ft)

2....15

3.7 2....15

3.7 3....15

3.7 4....15

3.7 3....15

4.7 4....15

4.7

INDOOR BLOWER

Nominal Airflow (CFM)

Size (in.)

Motor (HP)

700

10x10

1/8

800

10x10

1/4

1000

11x10

1/4

1200

11x10

1/2

1250

11x10

3/4

1600

11x10

3/4

2000

11x10

RETURN-AIR FILTERS (in.)

Throwaway 20x20x1 20x20x1 20x20x1 20x24x1 24x30x1 24x30x1 24x30x1

Table 1B—Physical Data

UNIT SIZE 50JX024 50JX030 50JX036 50JX042 50JX048 50JX060

NOMINAL CAPACITY (ton) 2 2 1/2 3 3-1/2 4 5

OPERATING WEIGHT (lb) 299 320 328 350 355 420

COMPRESSOR QUANTITY 1

TYPE SCROLL COMPRESSOR

REFRIGERANT R-22

REFRIGERANT METERING DEVICE Accurater ®

Refrigerant (R-22) Quantity (lb.) 5.5 6.4 7.0 10.8 10.4 12.3

ORIFICE ID (in.) 0.065 0.073 0.076 0.080 0.088 0.0.93

ORIFICE OD (in.) 0.055 0.065 0.067 2@0.052 2@0.057 2@0.063

OUTDOOR COIL

Rows...Fins/in.

Face Area (sq ft)

1...17

14.6 2...17

10.9 2...17

14.4 2...17

16.4

OUTDOOR FAN

Nominal Airflow (CFM)

Diameter

Motor HP (RPM)

2350

1/8 (825)

2350

1/8 (825)

2800

1/4 (1100)

2800

1/8 (825)

3300

1/4 (1100)

3300

1/4 (1100)

INDOOR COIL

Rows...Fins/in.

Face Area (Sq Ft)

3...15

3.7 3...15

3.7 4...15

3.7 4..15

4.7 4...15

5.7

INDOOR BLOWER

Nominal Airflow (CFM)

Size (in.)

Motor (HP)

800

10x10

1/4

1000

11x10

1/4

1200

11x10

1/2

1400

11x10

3/4

1600

11x10

3/4

2000

11x10

RETURN-AIR FILTERS (in.)

Throwaway 20x20x1 20x20x1 20x24x1 24x30x1 24x30x1 24x30x1

NOTE: Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.

Table 2A—Minimum Airflow for Reliable Electric Heater Operation (Cfm)

SIZE 50JS018 50JS024 50JS030 50JS036 50JS042 50JS048 50JS060

AIRFLOW (CFM) 650 800 1000* 1200 1400 1600 2000

Table 2B—Minimum Airflow for Reliable Electric Heater Operation (Cfm)

SIZE 50JX024 50JX030 50JX036 50JX042 50JX048 50JX060

AIRFLOW (CFM) 800 1000* 1200 1400 1600 2000

* The 030 size models must be run on medium or high speed when used in conjunction with 15 Kw electric heat accessory.

The units dispose of condensate through a 3/4 in. NPT female

fitting 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 installa-

tions. 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 from 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 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. 11). Do not undersize the tube. Pitch the drain trough

downward at a slope of at least 1 in. every 10 ft of horizontal run.

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

beginning of the cooling season start-up.

Step 7—Install Electrical Connections

The unit cabinet must have an uninterrupted, 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 lug

in the control compartment, or conduit approved for electrical

ground when installed in accordance with NEC, ANSI/NFPA

American National Standards Institute/National Fire Protec-

tion Association (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 follow 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 must be in accordance with CSA standard C22.1

Canadian Electrical Code Part 1 and applicable local

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%. Consult local

power company for correction of improper voltage and/or

phase imbalance.

4. Insulate low-voltage wires for highest voltage contained

within conduit when low-voltage control wires are in same

conduit as high-voltage wires.

5. Do not damage internal components when drilling through

any panel to mount electrical hardware, conduit, etc.

HIGH-VOLTAGE CONNECTIONS — The unit must have a

separate electrical service with a field-supplied, waterproof dis-

connect 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 Tables 3A and 3B for electrical data).

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

high-voltage inlet hole (See Figs. 2-3).

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

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

tions provided with the accessory for electrical service connec-

tions.

Operation of unit on improper line voltage constitutes abuse and

may cause unit damage that could affect warranty.

ROUTING POWER LEADS INTO UNIT — Use only copper

wire between disconnect and unit. The high-voltage leads should

Fig. 9—Typical Installation

C99061

INDOOR

THERMOSTAT

DISCONNECT

PER NEC

FROM

POWER

SOURCE

RETURN

AIR

TOP COVER

Fig. 10—50JX with Duct Covers On

(Unit shown with optional louvered grille)

C99030

Accessory Duct Covers

Fig. 11—Condensate Trap

C99013

1” MIN.

2” MIN.

TRAP

OUTLET

Fig. 12—Wiring Schematics

A00073

FIELD SPLICE

TERMINAL (MARKED)

TERMINAL (UNMARKED)

SPLICE

SPLICE (MARKED)

FACTORY WIRING

FIELD CONTROL WIRING

FIELD POWER WIRING

ACCESSORY OR OPTIONAL

WIRING

TO INDICATE COMMON

POTENTIAL ONLY:

NOT TO REPRESENT WIRING

AHA ADJUSTABLE HEAT ANTICIPATOR

C CONTACTOR

CAP CAPACITOR

CB CIRCUIT BREAKER

COMP COMPRESSOR MOTOR

CTD COMPRESSOR TIME DELAY

DB DEFROST BOARD

DFT DEFROST THERMOSTAT

DR DEFROST RELAY

EQUIP EQUIPMENT

FU FUSE

GND GROUND

HR HEATER RELAY

HTR HEATER

IFM INDOOR FAN MOTOR

LPS LOW PRESSURE SWITCH

OFM OUTDOOR FAN MOTOR

QT QUADRUPLE TERMINAL

RVS REVERSING VALVE SOLENOID

S.B. SLOW BLOW FUSE

TC THERMOSTAT - COOLING

TDR TIME DELAY RELAY

TH THERMOSTAT - HEATING

TRAN TRANSFORMER

NOTES:

1. IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED, IT MUST BE

REPLACED WITH TYPE 90 DEGREE C WIRE OR IT’S EQUIVALENT.

2. SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES.

3. USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION.

4. FOR HIGH SPEED IFM, DISCONNECT RED

WIRE FROM TDR 3 AND CONNECT BLK WIRE FROM IFM.

FOR MEDIUM SPEED, DISCONNECT RED WIRE

FROM TDR 3 AND CONNECT BLU WIRE FROM IFM.

5. DEFROST TIMER TO BE SET AT 90 MINUTES EXCEPT FOR 50JS048, 060 MODELS

SET AT 50 MINUTES.

LEGEND

Fig. 13—Wiring Schematics

A00074

Fig. 14—Wiring Schematics

A00075

FIELD SPLICE

TERMINAL (MARKED)

TERMINAL (UNMARKED)

SPLICE

SPLICE (MARKED)

FACTORY WIRING

FIELD CONTROL WIRING

FIELD POWER WIRING

ACCESSORY OR OPTIONAL

WIRING

TO INDICATE COMMON

POTENTIAL ONLY:

NOT TO REPRESENT WIRING

AHA ADJUSTABLE HEAT ANTICIPATOR

C CONTACTOR

CAP CAPACITOR

CB CIRCUIT BREAKER

COMP COMPRESSOR MOTOR

CTD COMPRESSOR TIME DELAY

DB DEFROST BOARD

DFT DEFROST THERMOSTAT

DR DEFROST RELAY

EQUIP EQUIPMENT

GND GROUND

HR HEATER RELAY

HTR HEATER

IFM INDOOR FAN MOTOR

LPS LOW PRESSURE SWITCH

OFM OUTDOOR FAN MOTOR

OFR OUTDOOR FAN RELAY

QT QUADRUPLE TERMINAL

RVS REVERSING VALVE SOLENOID

TC THERMOSTAT - COOLING

TDR TIME DELAY RELAY

TH THERMOSTAT - HEATING

TRAN TRANSFORMER

NOTES:

1. IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED, IT MUST BE

REPLACED WITH TYPE 90 DEGREE C WIRE OR IT’S EQUIVALENT.

2. SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES.

3. USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION.

4. FOR HIGH SPEED IFM, DISCONNECT RED

WIRE FROM TDR 3 AND CONNECT BLK WIRE FROM IFM.

FOR MEDIUM SPEED, DISCONNECT RED WIRE

FROM TDR 3 AND CONNECT BLU WIRE FROM IFM.

5. DEFROST TIMER TO BE SET AT 90 MINUTES EXCEPT FOR 50JS048, 060 MODELS

SET AT 50 MINUTES.

LEGEND

Table 3A—Electrical Data—50JS

UNIT 50JS

SIZE V-PH-HZ

VOLTAGE

RANGE COMPRESSOR ODFM IDFM ELECTRIC HEAT POWER SUPPLY

Min Max RLA LRA FLA FLA Nominal KW* FLA MCA Max Fuse or CRCT Breaker MOCP

018 208/230-1-60 187 253 9 48 0.9 1.8 -/-

3.8/5

7.5/10

-/-

18.1/20.8

36.1/41.7

14.0/14.0

24.8/28.3

47.4/54.3

20/20

25/25

50/60

024 208/230-1-60 187 253 12.8 61 0.9 2 -/-

3.8/5

7.5/10

-/-

18.1/20.8

36.1/41.7

18.9/18.9

25.1/28.5

47.6/54.6

25/25

25/30

50/60

030

208/230-1-60 187 253 14.7 82 0.9 2

-/-

3.8/5

7.5/10

11.3/15

-/-

18.1/20.8

36.1/41.7

54.2/62.5

21.3/21.3

25.1/28.5

47.6/54.6

72.8/83.3

25/25

25/30

50/60

80/90

208/230-3-60 187 253 9.9 78 0.9 2

-/-

3.8/5

7.5/10

11.3/15

-/-

10.4/12

20.8/24.1

31.3/36.1

15.3/15.3

15.5/17.5

28.6/32.6

44.2/50.2

20/20

30/35

45/60

036

208/230-1-60 187 253 16.8 82 1.5 4.1

-/-

3.8/5

7.5/10

11.3/15

-/-

18.1/20.8

36.1/41.7

54.2/62.5

26.6/26.6

27.7/31.2

50.3/57.2

72.8/83.3

35/35

60/60

80/90

208/230-3-60 187 253 9.9 85 1.5 4.1

-/-

3.8/5

7.5/10

11.3/15

-/-

10.4/12

31.3/36.1

36.1/41.7

18.0/18.0

18.2/20.2

44.2/50.2

47.8/54.7

25/25

35/40

45/60

460-3-60 414 506 5.5 40 0.8 1.9

-/-

6.0

12.0

18.0

9.6

9.9

17.4

24.9

042

208/230-1-60 187 253 20.6 115 0.9 3.8

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

30.5/30.5

30.5/30.8

49.9/56.8

72.4/82.9

95.0/108.9

40/40

50/60

90.0

100/110

208/230-3-60 187 253 12.4 90 0.9 3.8

-/-

3.8/5

7.5/10

11.3/15

15/19.94

-/-

10.4/12

20.8/24.1

31.3/36.1

41.6/48

20.2/20.2

30.8/34.8

43.8/49.9

56.7/64.7

25/25

35/35

45/50

60/70

460-3-60 414 506 6.7 45 0.8 1.8

-/-

15-20

-/-

6.0

12.0

18.0

24.1

11.0

17.3

24.8

32.3

048

208/230-1-60 187 253 24.4 140 1.5 3.5

-/-

3.8/5

7.5/10

11.3/15

15/20

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

35.5/35.5

49.5/56.5

72.1/82.5

94.6/108.5

45/45

50/60

90.0

100/110

208/230-3-60 187 253 14.1 105 1.5 3.5

-/-

3.8/5

7.5/10

11.3/15

15/19.94

-/-

10.4/12

20.8/24.1

31.3/36.1

41.6/48.0

22.6/22.6

30.4/34.4

43.5/49.5

56.3/64.3

30/30

35/35

45/50

60/70

460-3-60 414 506 7.1 53 0.8 1.8

-/-

6.0

12.0

18.0

24.1

11.5

17.3

24.8

32.3

060

208/230-1-60 187 253 28.8 165 1.5 6.2

-/-

3.8/5

7.5/10

11.3/15

15/20

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

43.7/43.7

52.9/59.8

75.4/85.9

98.0/111.9

60/60

90.0

100/125

208/230-3-60 187 253 19.4 125 1.5 6.2

-/-

3.8/5

7.5/10

11.3/15

15/19.94

-/-

10.4/12

20.8/24.1

31.3/36.1

41.6/48.0

32.0/32.0

33.8/37.8

46.8/52.9

59.7/67.7

40/40

35/40

50/60

60/70

460-3-60 414 506 8 63 0.8 3.2

-/-

6.0

12.0

18.0

24.1

14.0

19.0

26.6

34.1

* Heater capacity (KW) based on heater voltage of 208v, 240v, and 480v. If power distribution voltage to unit varies from rated heater voltage, heater KW will vary

accordingly.

→Table 3B—Electrical Data—50JX

UNIT 50JX

SIZE V-PH-HZ

VOLTAGE

RANGE COMPRESSOR ODFM IDFM ELECTRIC HEAT POWER SUPPLY

Min Max RLA LRA FLA FLA Nominal KW* FLA MCA Max Fuse or CRCT Breaker MOCP

024 208/230-1-60 187 253.00 10.8 56 0.90 2 -/-

3.75/5.0

7.5/10

-/-

18.1/20.8

36.1/41.7

16.4/16.4

25.1/28.5

47.6/54.6

20/20

25/30

50/60

030

208/230-1-60 187 253 14 73 0.9 2.1

-/-

3.75/5.0

7.5/10

11.3/15

-/-

18.1/20.8

36.1/41.7

54.2/62.5

20.5/20.5

25.2/28.7

47.8/54.7

72.2/82.6

25/25

25/30

50/60

80/90

208/230-3-60 187 253 10.3 63 0.9 2.1

-/-

3.75/5.0

7.5/10

11.3/15

-/-

10.4/12.0

20.8/24.1

31.3/36.1

16.0/16.0

16.0/17.7

28.7/32.7

41.7/47.7

20/20

30/35

45/50

036

208/230-1-60 187 253 16.7 97 1.6 3.6

-/-

3.75/5.0

7.5/10

11.3/15

-/-

18.1/20.8

36.1/41.7

54.2/62.5

26.1/26.1

27.1/30.5

49.6/56.6

72.2/82.6

35/35

50/60

80/90

208/230-3-60 187 253 11.9 75 1.6 3.6

-/-

3.75/5.0

7.5/10

11.3/15

-/-

10.4/12.0

20.8/24.1

31.3/36.1

19.2/19.2

19.2/19.5

47.8/54.7

43.6/49.6

25/25

35/35

45/50

460-3-60 414 506 5.4 37.5 0.9 1.9

--/-

9.6

9.9

17.4

24.9

042

208/230-1-60 187 253 18.4 104 0.9 4.1

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

28.0/28.0

28.0/31.2

50.3/57.2

72.8/83.3

95.4/109.3

35/35

60/60

90.0

100/110

208/230-3-60 187 253 12.4 88 0.9 4.1

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48.0

20.5/20.5

31.2/35.2

44.2/50.2

57.1/65.1

25/25

35/40

45/60

60/70

460-3-60 414 506 5.8 44 0.9 2.0

-/-

10.2

17.5

25.1

32.6

048

208/230-1-60 187 253 23.4 104 1.6 4.1

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

18.1/20

36.1/41.7

54.2/62.5

72.2/83.8

35.0/35.0

50.3/57.2

72.8/83.3

95.4/109.3

45/45

60/60

90.0

100/110

208/230-3-60 187 253 13.5 88 1.6 4.1

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48

22.6/22.6

31.2/35.2

44.2/50.2

57.1/65.1

30/30

35/40

45/60

60/70

460-3-60 414 506 6.8 44 0.9 2

-/-

11.4

17.5

25.1

32.6

060

208/230-1-60 187 253 28.8 169 1.4 6.2

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

43.6/43.6

52.9/59.8

75.4/85.9

98.0/111.9

60/60

90.0

100/125

208/230-3-60 187 253 17.3 123 1.4 6.2

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48.0

29.2/29.2

33.8/37.8

46.8/52.9

59.7/67.7

35/35

35/40

50/60

60/70

460-3-60 414 506 9 62 0.9 3.2

-/-

15.4

19.0

26.6

34.1

* Heater capacity (KW) based on heater voltage of 208v, 240v, and 480v. If power distribution voltage to unit varies from rated heater voltage, heater KW will vary

accordingly.

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. 2 and 3 for location and size). When the leads are inside

the unit, run leads up the high-voltage raceway to the line wiring

splice box (See Fig. 12 through 14). For single-phase units,

connect leads to the black and yellow wires; for 3-phase units,

connect the leads to the black, yellow, and blue wires (See Fig.

17).

CONNECTING GROUND LEAD TO GROUND LUG — Refer

to Fig. 17. Connect the ground lead to the chassis using the ground

lug in the wiring splice box.

ROUTING CONTROL POWER WIRES — (24 V) — Form a

drip-loop with the thermostat leads before routing them into the

unit. Route the thermostat leads through grommeted, low-voltage

hole provided in unit into unit control power splice box (See Fig.

2 and 3). Connect thermostat leads to unit control power leads as

shown in Fig. 16.

The unit transformer supplies 24-v power for complete system

including accessory electrical heater. An automatic-reset circuit

breaker (See Fig. 18) is provided in the 24-v circuit; see the caution

label on the transformer or Fig. 19. 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.

Fig. 15—Electrical Data Legend C99024

452=5v

457=7v

455=2v

LEGEND

FLA — Full Load Amps

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

RLA — Rated Load Amps

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. The CGA (Canadian Gas

Association) 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

max voltage deviation from average voltage

= 100 x average voltage

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

452 + 464 + 455

Average Voltage = 3

1371

= 457

Determine maximum deviation from average voltage.

(AB) 457

(BC) 464

(AC) 457

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.

Fig. 16—Control Connections C99056

THERMOSTAT

AND SUBBASE UNIT CONTROL POWER

SPLICE BOX

BRN

WHT

YEL

GRN

RED

ORN

Fig. 17—Line Power Connections C99057

GROUND LUG

(IN SLPICE BOX)

BLU

YEL

BLK

GROUND

LEAD

SINGLE-PHASE

CONNECTIONS

TO DISCONNECT

PER NEC

3-PHASE

CONNECTIONS

LEGEND

NEC – National Electrical Code

Field Wiring

Splice Connections

NOTE: Use copper wire only.

Fig. 18—Control Wiring Plate

C99070

24 V Circuit Breaker

24 Volt Compartment

SPECIAL PROCEDURES FOR 208-V OPERATION

1. Disconnect the yellow primary lead (w110) from the trans-

former. See unit wiring label (See Fig. 12 through 14).

2. Connect the yellow primary lead (w110) to the transformer

terminal labeled 200v.

Indoor blower-motor speeds may need to be changed for 208-v

operation. Refer to indoor airflow and airflow adjustments section.

PRE-START-UP

Failure to observe the following warnings could result in

serious personal injury or death:

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 electri-

cal sources are disconnected.

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 refrig-

erant system is under pressure.

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

contains oil and refrigerant under pressure.

To remove a component, wear protective goggles and

proceed as follows:

a. Shut off electrical power to unit.

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 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 follows to inspect and prepare the unit for initial

start-up:

1. Remove access panel.

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

CAUTION, and INFORMATION labels attached to, or

shipped with, unit.

3. Make the following inspections:

a. Inspect for shipping and handling damages such as broken

lines, loose parts, disconnected wires, etc.

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 refrig-

erant 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. 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.

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.

5. Compressors are internally spring mounted. Do not loosen or

remove compressor hold-down bolts.

6. Each unit system has 2 Schrader-type ports, one low-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

Using the Start-Up Checklist supplied at the end of this book,

proceed as follows:

Step 1—Check for Refrigerant Leaks

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

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

pressure and reclaim remaining refrigerant

2. Repair leak following accepted practices.

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

been 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 R-22 refrigerant, using a volumetric-

charging cylinder or accurate scale. Refer to unit rating plate

for required charge. Be sure to add extra refrigerant to

compensate for internal volume of filter drier.

Step 2—Start-Up Adjustments

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

section on this page 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.

CHECKING COOLING AND HEATING CONTROL OPERA-

TION — Start and check the unit for proper 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 60 sec. when FAN

switch is placed in AUTO position.

Fig. 19—Transformer Label C99058

TRANSFORMER CONTAINS A MANUAL

RESET OVERCURRENT PROTECTOR

IT WILL NOT AUTOMATICALLY RESET

DISCONNECT POWER PRIOR TO

SERVICING

THIS COMPARTMENT MUST BE CLOSED

EXCEPT WHEN SERVICING

Fig. 20—Fan Blade Clearance C99009

FAN GRILLE

MOTOR

1/8" MAX BETWEEN

MOTOR AND FAN HUB MOTOR SHAFT

Fig. 22—Typical Heat Pump Operation, Cooling Mode

1. Hot gas from compressor flows through the 4-way valve and is directed to the outdoor coil. It is then condensed and subcooled through the coil circuits. Refrigerant leaves

the outdoor coil by way of the OD Accurater in the bypass position to the liquid line.

2. The refrigerant then feeds the indoor coil through the ID Accurater device in the metering position and distributes to each circuit.

3. Each circuit evaporates the refrigerant and the circuits are combined in the indoor coil header.

4. The refrigerant then flows through the 4-way valve, accumulator, and back to the compressor.

C99028

COMPRESSOR

ACCUMULATOR

OUTDOOR COIL INDOOR COIL

LCS

LEGEND

LCS – Loss of Charge Switch

Accurater® Metering Device

Arrow indicates direction of flow

Metering

Position

Bypass

Position

Fig. 21—Typical Heat Pump Operation, Heating Mode

1. Hot gas from compressor flows through the 4-way valve and is directed to the indoor coil. It is then condensed and subcooled through the coil circuits and then leaves

the indoor coil by way of the ID Accurater in the bypass position to the liquid line.

2. The refrigerant then feeds the outdoor coil through the OD Accurater device in the metering position and distributes to each circuit.

3. Each circuit evaporates the refrigerant and the circuits are combined in the outdoor coil header.

4. The refrigerant then flows through the 4-way valve, accumulator, and back to the compressor.

C99027

COMPRESSOR

ACCUMULATOR

OUTDOOR COIL INDOOR COIL

LCS

LEGEND

LCS – Loss of Charge Switch

Accurater® Metering Device

Arrow indicates direction of flow

Bypass

Position

Metering

Position

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

AUTO position. Set control below room temperature. Observe

that cooling cycle shuts down when control setting is satisfied.

3. Place system switch in HEAT 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.

4. When using an automatic changeover room thermostat, place

both SYSTEM and FAN switches in AUTO positions. Ob-

serve 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).

IMPORTANT: Three-phase, scroll compressors are direction ori-

ented. Unit must be checked to ensure proper compressor 3-phase

power lead orientation. If not corrected within 5 min., 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, scroll compressors emit elevated noise levels, and the

difference between compressor suction and discharge pressures

may be dramatically lower than normal.

CHECKING AND ADJUSTING REFRIGERANT CHARGE

— The refrigerant system is fully charged with R-22 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-22 charge.

Table 4A—Wet Coil Air Delivery

Unit 50JS 018-060 (Deduct 10% for 208v)*

UNIT MOTOR SPEED EXTERNAL STATIC PRESSURE (IN. WG)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

018

Low Watts - - - 214 191 170 -----

Cfm---821696575-----

Med Watts -----------

Cfm-----------

High Watts ----283274267----

Cfm----848707555----

024

Low Watts - - 237 214 191 ------

Cfm--971821696------

Med Watts ----368366365360---

Cfm----957872785688---

High Watts -------425414--

Cfm-------891735--

Low Watts 295 292 289 --------

Cfm928882802--------

Med Watts 388 383 377 372 366 361 -----

Cfm 1203 1120 1062 1004 930 838 -----

High Watts ----469458449442---

Cfm----1141 1027 924 828 - - -

Low Watts 592 581 567 552 538 525 512 499 - - -

Cfm 1499 1421 1351 1281 1207 1125 1034 936 - - -

Med Watts - - - 660 636 617 603 592 581 566 -

Cfm - - - 1475 1371 1274 1186 1105 1024 928 -

High Watts -----776761744725706689

Cfm-----1452 1356 1254 1145 1030 910

Low Watts 606 596 586 575 563 550 537 - - - -

Cfm 1464 1399 1341 1282 1218 1146 1066 - - - -

Med Watts 680 665 649 635 622 611 600 590 - - -

Cfm 1608 1535 1461 1387 1316 1247 1180 1111 - - -

High Watts 768 755 742 730 718 707 696 684 671 - -

Cfm 1656 1576 1508 1447 1390 1331 1268 1198 1119 - -

Low Watts 741 724 709 690 664 631 594 562 543 552 -

Cfm 1994 1937 1869 1797 1722 1645 1566 1480 1384 1269 -

Med Watts - - - 773 744 715 687 662 640 625 -

Cfm - - - 1957 1867 1787 1719 1653 1575 1463 -

High Watts -----799782773756704-

Cfm-----1914 1842 1774 1686 1538 -

Low Watts 742 723 698 666 629 591 559 540 - - -

Cfm 2197 2141 2103 2057 1988 1894 1783 1674 - - -

Med Watts 838 822 803 780 752 721 689 661 639 632 -

Cfm 2485 2406 2269 2127 2012 1937 1894 1855 1770 1571 -

High Watts - 934 913 891 866 837 806 776 750 735 -

Cfm - 2483 2391 2283 2170 2061 1960 1868 1780 1687 -

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

static pressure available for ducting.

NOTES:

1. 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.

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

3. Deduct 10% for 208v.

The charging label and the tables shown refer to system tempera-

tures and 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 nameplate amount. (This information may be obtained from the

physical data table also.)

IMPORTANT: When evaluating the refrigerant charge, an indi-

cated 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 insuf-

ficient airflow across either coil or both coils.

REFRIGERANT CHARGE — The amount of refrigerant charge

is listed on the unit nameplate and /or the physical data table. Refer

to the Refrigeration Service Techniques Manual, Refrigerants

Section.

NO CHARGE — Check for leak. Use standard evacuating tech-

niques. After evacuating system, weigh in the specified amount of

refrigerant (refer to system data plate).

LOW CHARGE COOLING — Use Cooling Charging Charts

(Figs. 23-35). 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 superheat

for the various operating conditions. Accurate pressure gage and

temperature sensing devices are required. Connect the pressure

gage 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 effect the reading. Indoor air CFM must

be within the normal operating range of the unit.

TO USE COOLING CHARGING CHARTS — Take the outdoor

ambient temperature and read the suction pressure gage. Refer to

the chart to determine what the suction temperature should be.

NOTE: If the problem causing the inaccurate readings is a

refrigerant leak, refer to Check for Refrigerant Leaks section.

Table 4B—Wet Coil Air Delivery

Unit 50JX 024-060 (Deduct 10% for 208v)*

UNIT MOTOR SPEED EXTERNAL STATIC PRESSURE (IN. WG)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

024

Low Watts 275 273 271 270 -------

Cfm923844754669-------

Med Watts - - - 359 353 350 347 341 - - -

Cfm - - - 941 876 814 737 622 - - -

High Watts ------447439431423-

Cfm------968869765659-

Low Watts 276 276 272 --------

Cfm963929781--------

Med Watts 375 377 371 362 354 350 -----

Cfm 1202 1170 1079 976 884 807 -----

High Watts ----469449435428---

Cfm----1174 988 828 718 - - -

Low Watts 462 451 431 411 394 381 -----

Cfm 1374 1290 1205 1116 1020 916 -----

Med Watts 523 506 490 471 449 426 -----

Cfm 1500 1408 1301 1190 1082 977 -----

High Watts - 645 628 610 595 584 575 ----

Cfm - 1474 1369 1267 1169 1069 962 ----

Low Watts 620 600 586 574 562 548 530 510 487 462 439

Cfm 1662 1621 1581 1540 1496 1447 1392 1331 1263 1186 1103

Med Watts ----686661634606577547517

Cfm----1722 1662 1594 1515 1427 1330 1227

High Watts -------757730704682

Cfm-------1669 1577 1486 1402

Low Watts 620 600 586 574 562 548 530 - 487 - -

Cfm 1662 1621 1581 1540 1496 1447 1392 1331 1263 - -

Med Watts 763 747 729 709 686 661 634 606 577 547 517

Cfm 1917 1868 1822 1774 1722 1662 1594 1515 1427 1330 1227

High Watts - - - 852 832 809 784 757 730 704 682

Cfm - - - 1982 1914 1839 1757 1669 1577 1486 1402

Low Watts 597 592 578 526 460 452 445 ----

Cfm 2265 2190 2101 2033 1974 1869 1614 ----

Med Watts 754 730 707 687 671 658 646 630 603 558 486

Cfm 2383 2282 2202 2134 2070 2005 1935 1858 1771 1667 1576

High Watts 901 876 856 836 813 785 755 723 696 681 687

Cfm 2480 2383 2301 2233 2175 2122 2066 1998 1910 1788 1619

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

static pressure available for ducting.

NOTES:

1. 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.

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

3. Deduct 10% for 208v.

INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS

For heating and cooling operation, the recommended airflow

is 350 to 450 cfm for each 12,000 Btuh of rated cooling

capacity. for units with optional electric heat, the airflow must

not be reduced below the levels stated in Tables 2A and 2B.

Tables 4A and 4B shows both heating and cooling airflows at

various external static pressures. Refer to these tables to determine

the airflow for the system being installed.

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

from obstructions, and adjusted properly.

Airflow can be changed by changing the lead connection of the

blower motor.

Unit 50JS and JX three-speed motors (except sizes JS 018 and JX

030) are factory wired for low speed operation. Unit 50JX 030 is

factory wired for medium speed. Unit 50JS 018 has a two-speed

motor wired for low speed.

For 208/230-v Motors:—The motor leads are color-coded as

follows:

3-SPEED

Black = high speed

Blue = medium speed

Red = low speed

Fig. 23—Cooling Charging Chart, 50JS 018 Units

C00026

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

-7 -1 4 10 16 21 27

SUCTION LINE TEMPERATURE (°F)

SUCTION LINE TEMPERATURE (°C)

689

620

551

483

414

345

276

207

100

(018) 60HZ CHARGING CHART

20.0 30.0 40.0 50.0 60.0 70.0 80.0

OUTDOOR TEMP

° F ° C

115 46

125 52

45 7

55 13

65 18

75 24

95 35

105 41

85 29

50JS500087

Fig. 24—Cooling Charging Chart, 50JS 024 Units

C00027

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

-7 -1 4 10 16 21 27

SUCTION LINE TEMPERATURE (°F)

SUCTION LINE TEMPERATURE (°C)

758

689

620

551

483

414

345

276

110

100

(024) 60HZ CHARGING CHART

20.0 30.0 40.0 50.0 60.0 70.0 80.0

OUTDOOR TEMP

° F ° C

115 46

125 52

45 7

55 13

65 18

75 24

95 35

105 41

85 29

50JS500088

Fig. 25—Cooling Charging Chart, 50JS030 Units

C00028

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

-7 -1 4 10 16 21 27

SUCTION LINE TEMPERATURE (°F)

SUCTION LINE TEMPERATURE (°C)

689

620

551

483

414

345

276

207

100

(030) 60HZ CHARGING CHART

20.0 30.0 40.0 50.0 60.0 70.0 80.0

OUTDOOR TEMP

° F ° C

115 46

125 52

45 7

55 13

65 18

75 24

95 35

105 41

85 29

50JS500089

Fig. 26—Cooling Charging Chart, 50JS 036 Units

C00029

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

-7 -1 4 10 16 21 27

SUCTION LINE TEMPERATURE (°F)

SUCTION LINE TEMPERATURE (°C)

689

620

551

483

414

345

276

207

100

(036) 60HZ CHARGING CHART

20.0 30.0 40.0 50.0 60.0 70.0 80.0

OUTDOOR TEMP

° F ° C

115 46

125 52

45 7

55 13

65 18

75 24

95 35

105 41

85 29

50JS500090

To change the speed of the blower motor (BM), remove the fan

motor speed leg lead from the blower relay (BR). This wire is

attached to IGC terminal BM for single-phase and 3-phase units.

To change the speed, remove and replace with lead for desired

blower motor speed. Insulate the removed lead to avoid contact

with chassis parts.

For 460-v GE Motors—The motor leads are color coded as

follows:

3-SPEED

Black = high

Violet = jumper

Orange = medium

Red = low

To change the speed of the blower motor (BM), remove fan motor

speed lead from the blower relay (BR) and replace with the lead

for the desired blower motor speed. The motor speed lead is

attached to terminal BM. For low and medium speeds black must

be connected to the jumper wire. Insulate removed lead end to

avoid contact with chassis parts. To select high speed on 460-v GE

motors, separate the black female quick connect (QC) from the

jumper lead male quick connect (QC) and connect the black lead

to the BR. Insulate the jumper to avoid contact with any chassis

parts.

MAINTENANCE

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 5.

NOTE TO EQUIPMENT OWNER: Consult your local dealer

about the availability of a maintenance contract.

The ability to properly perform maintenance on this equip-

ment 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 User’s Manual. FAILURE

TO HEED THIS WARNING COULD RESULT IN SERI-

OUS INJURY OR DEATH AND POSSIBLE DAMAGE TO

THIS EQUIPMENT.

Fig. 27—Cooling Charging Chart, 50JS 042 Units

C00030

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

-7 -1 4 10 16 21 27

SUCTION LINE TEMPERATURE (°F)

SUCTION LINE TEMPERATURE (°C)

689

620

551

483

414

345

276

207

100

(042) 60HZ CHARGING CHART

20.0 30.0 40.0 50.0 60.0 70.0 80.0

OUTDOOR TEMP

° F ° C

115 46

125 52

45 7

55 13

65 18

75 24

95 35

105 41

85 29

50JS500091

Fig. 28—Cooling Charging Chart, 50JS 048 Units

C00031

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

-7 -1 4 10 16 21 27

SUCTION LINE TEMPERATURE (°F)

SUCTION LINE TEMPERATURE (°C)

689

620

551

483

414

345

276

207

100

(048) 60HZ CHARGING CHART

20.0 30.0 40.0 50.0 60.0 70.0 80.0

OUTDOOR TEMP

° F ° C

115 46

125 52

45 7

55 13

65 18

75 24

95 35

105 41

85 29

50JS500092

Fig. 29—Cooling Charging Chart, 50JS 060 Units

C00032

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

-7 -1 4 10 16 21 27

SUCTION LINE TEMPERATURE (°F)

SUCTION LINE TEMPERATURE (°C)

689

620

551

483

414

345

276

207

100

(060) 60HZ CHARGING CHART

20.0 30.0 40.0 50.0 60.0 70.0 80.0

OUTDOOR TEMP

° F ° C

115 46

125 52

45 7

55 13

65 18

75 24

95 35

105 41

85 29

50JS500093

Fig. 30—Cooling Charging Chart, 50JX 024 Units

C99031

689 100.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

207

276

345

414

483

551

620

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

20.0

-7 272116104-1

SUCTION LINE TEMPERATURE (DEG. C)

80.070.060.050.040.030.0

50JX500219

(024) 60 Hz CHARGING CHART OUTDOOR

TEMP

F C

125 52

115 46

105 41

95 35

85 29

75 24

65 18

55 13

45 7

SUCTION LINE TEMPERATURE (DEG. F)

Fig. 31—Cooling Charging Chart, 50JX 030 Units

C99032

689 100.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

207

276

345

414

483

551

620

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

20.0

-7 272116104-1

80.070.060.050.040.030.0

50JX500220

(030) 60 Hz CHARGING CHART OUTDOOR

TEMP

F C

125 52

115 46

105 41

95 35

85 29

75 24

65 18

55 13

45 7

SUCTION LINE TEMPERATURE (DEG. C)

SUCTION LINE TEMPERATURE (DEG. F)

Fig. 32—Cooling Charging Chart, 50JX036 Units

C99033

689 100.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

207

276

345

414

483

551

620

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

20.0

-7 272116104-1

80.070.060.050.040.030.0

50JX500221

(036) 60 Hz CHARGING CHART OUTDOOR

TEMP

F C

125 52

115 46

105 41

95 35

85 29

75 24

65 18

55 13

45 7

SUCTION LINE TEMPERATURE (DEG. C)

SUCTION LINE TEMPERATURE (DEG. F)

Fig. 33—Cooling Charging Chart, 50JX 042 Units

C99034

689 100.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

207

276

345

414

483

551

620

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

20.0

-7 272116104-1

80.070.060.050.040.030.0

50JX500222

(042) 60 Hz CHARGING CHART OUTDOOR

TEMP

F C

125 52

115 46

105 41

95 35

85 29

75 24

65 18

55 13

45 7

SUCTION LINE TEMPERATURE (DEG. C)

SUCTION LINE TEMPERATURE (DEG. F)

Fig. 34—Cooling Charging Chart, 50JX 048 Units

C99035

SUCTION LINE TEMPERATURE (DEG. F)

689 100.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

207

276

345

414

483

551

620

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

20.0

-7 272116104-1

80.070.060.050.040.030.0

50JX500223

(048) 60 Hz CHARGING CHART OUTDOOR

TEMP

F C

125 52

115 46

105 41

95 35

85 29

75 24

65 18

55 13

45 7

SUCTION LINE TEMPERATURE (DEG. C)

Fig. 35—Cooling Charging Chart,50JX 060 Units

C99036

689 100.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

207

276

345

414

483

551

620

SUCTION LINE PRESSURE (KILOPASCALS)

SUCTION LINE PRESSURE (PSIG)

20.0

-7 272116104-1

SUCTION LINE TEMPERATURE (DEG. C)

80.070.060.050.040.030.0

SUCTION LINE TEMPERATURE (DEG. F)

50JX500224

(060) 60 Hz CHARGING CHART OUTDOOR

TEMP

F C

125 52

115 46

105 41

95 35

85 29

75 24

65 18

55 13

45 7

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.

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

with any mechanical equipment, personal injury can result

from sharp edges.

3. Never place anything combustible either on, or in contact

with, the unit.

Errors made when reconnecting wires may cause improper

and dangerous operation. Label all wires prior to disconnec-

tion when servicing.

The minimum maintenance requirements for this equipment are as

follows:

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

necessary.

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

cooling season for cleanliness. Clean when necessary.

3. Inspect blower motor and wheel for cleanliness each cooling

season. Clean when necessary.

4. Check electrical connections for tightness and controls for

proper operation each cooling season. Service when neces-

sary.

AIR FILTER

IMPORTANT: Never operate the unit without a suitable air filter

in the return-air duct system. Always replace the filter with the

same dimensional size and type as originally installed (See Tables

1A and 1B for 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.

INDOOR BLOWER AND MOTOR

NOTE: All motors are prelubricated. Do not attempt to lubricate

these motors.

For longer life, operating economy, and continuing efficiency,

clean accumulated dirt and grease from the blower wheel and

motor annually.

Disconnect and tag electrical power to the unit before

cleaning and lubricating the blower motor and wheel. Failure

to adhere to this warning could cause personal injury or death.

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-water solution.

Rinse coils with clear water, 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.

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. Ensure that the

auxiliary drain port above the drain trough is also clear.

OUTDOOR FAN

Keep the condenser fan free from all obstructions to ensure

proper cooling operation. Never place articles on top of the

unit. Damage to unit may result.

1. Inspect the fan blades for cracks or bends.

2. If fan needs to be removed, remove screws holding outdoor air

intake grille and remove grille.

3. Loosen the setscrew and slide the fan off the motor shaft.

4. 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. 20).

5. Ensure that setscrew engages the flat area on the motor shaft

when tightening.

6. Replace grille.

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, restrip 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 instrumenta-

tion. Refer to the unit wiring label when making these checkouts.

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

determining proper control operation.

REFRIGERANT CIRCUIT — Inspect all refrigerant tubing con-

nections and the unit base for oil accumulation annually. Detecting

oil generally indicates a refrigerant leak.

System under pressure. Relieve pressure and recover all

refrigerant before system repair or final unit disposal to avoid

personal injury or death. Use all service ports and open all

flow-control devices, including solenoid valves.

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.

INDOOR AIRFLOW — The indoor airflow does not require

checking unless 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. When

necessary, refer to Indoor Airflow and Airflow Adjustments

section to check the system airflow.

METERING DEVICES — Refrigerant metering devices are fixed

orifices and are located in the inlet header to the indoor and

outdoor coils.

LIQUID LINE STRAINERS — The liquid line strainers (to pro-

tect metering devices) are made of wire mesh and are located in the

liquid lines on the inlet side of the metering devices.

SYSTEM INFORMATION

TIME-DELAY RELAY — The Time-Delay Relay (TDR) is a

solid-state control, recycle delay timer which keeps indoor blower

operating for 60 sec. after thermostat is satisfied. This delay

enables blower to remove residual cooling in coil after compres-

sion shutdown, thereby improving efficiency of system. The

sequence of operation is that on closure of wall thermostat and at

end of a fixed on delay of 1 sec., fan relay is energized. When

thermostat is satisfied, an off delay is initiated. When fixed delay

of 60 ±5 sec. is completed, fan relay is de-energized and fan motor

stops. If wall thermostat closes during this delay, TDR is reset and

fan relay remains energized. TDR is a 24-v device that operates

within a range of 15v to 30v and draws about 0.5 amps. If the

blower runs continuously instead of cycling off when the fan

switch is set on AUTO, the TDR is probably defective and must be

replaced.

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.

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 gages 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 1 of the feeder tubes, there is a 3/8-in. OD stub tube

approximately 3 in. long. (See Fig. 37.) The defrost thermostat

should be located on stub tube. Note that there is only 1 stub tube

used with liquid header, and on most units it is the bottom circuit.

DEFROST THERMOSTATS — 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 tempera-

ture range is closed at 30˚ +/- 3˚F and open at 80˚ +/- 5˚F.

NOTE: The defrost thermostat must be located on the liquid side

of the outdoor coil on the bottom circuit and as close to the coil as

possible.

Fig. 36—Refrigerant Circuit

C99097

Fig. 37—Defrost Thermostat

C99029

FEEDER TUBE

STUB TUBE

DEFROST

THERMOSTAT

Table 5—Cooling and Heating Troubleshooting Chart

SYMPTOM CAUSE REMEDY

Compressor and outdoor fan will not start

Power failure Call power company

Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker

Defective thermostat, contactor, transformer, con-

trol relay or defrost board Replace component

Insufficient line voltage Determine cause and correct

Incorrect or faulty wiring Check wiring diagram and rewire correctly

Thermostat setting too high Lower thermostat setting below room tempera-

ture

Units have a 5-min. time delay DO NOT bypass this compressor time

delay—wait for 5 min. until time-delay relay is

deenergized

Compressor will not start but condenser fan

runs

Faulty wiring or loose connections in compressor

circuit Check wiring and repair or replace

Compressor motor burned out, seized, or internal

overload open Determine cause

Replace compressor

Defective run capacitor, overload, or PTC (posi-

tive temperature coefficient) thermistor Determine cause and replace

One leg of 3-phase power dead Replace fuse or reset circuit breaker

Determine cause

Low input voltage (20% low) Determine cause and correct

Three-phase scroll compressor (size 030-

060units) makes excessive noise, and there

may be a low pressure differential

Scroll compressor is rotating in the wrong direc-

tion Correct the direction of rotation by reversing the

3-phase power leads to the unit

Compressor cycles (other than normally sat-

isfying thermostat)

Refrigerant overcharge or undercharge Recover refrigerant, evacuate system, and re-

charge to capacities shown on nameplate

Defective compressor Replace and determine cause

Insufficient line voltage Determine cause and correct

Blocked outdoor coil Determine cause and correct

Defective run/start capacitor, overload or start

relay Determine cause and replace

Defective thermostat Replace thermostat

Faulty outdoor-fan motor or capacitor Replace

Damaged reversing valve Determine cause and correct

Restriction in refrigerant system Locate restriction and remove

Compressor operates continuously

Dirty air filter Replace filter

Unit undersized for load Decrease load or increase unit size

Thermostat set too low Reset thermostat

Low refrigerant charge Locate leak, repair, and recharge

Leaking valves in compressor Replace compressor

Frosted coil with incorrect defrost operation

Check defrost time settings

Reset as necessary

Check defrost temperature switch

Replace as necessary

Air in system Recover refrigerant, evacuate system, and re-

charge

Outdoor coil dirty or restricted Clean coil or remove restriction

Excessive head pressure

Dirty air filter Replace filter

Dirty indoor or outdoor coil Clean coil

Refrigerant overcharged Recover excess refrigerant

Air in system Recover refrigerant, evacuate system, and re-

charge

(Heat) Indoor air restricted or recirculating Determine cause and correct

Indoor or outdoor air restricted or air short-cycling Determine cause and correct

Head pressure too low

Low refrigerant charge Check for leaks, repair and recharge

Compressor valves leaking Replace compressor

Restriction in liquid tube Remove restriction

Excessive suction pressure

(Heat) Outdoor coil frosted Move timer on control board to 30 min. between

defrost cycles

(Cool) High Heat load Check for source and eliminate

Compressor valves leaking Replace compressor

Reversing valve hung up or leaking internally Replace valve

Refrigerant overcharged Recover excess refrigerant

Cooling and Heating Troubleshooting Chart (cont’d)

SYMPTOM CAUSE REMEDY

Suction pressure too low (Cool) Dirty air filter Replace filter

(Heat) Outdoor coil frosted Move timer on control board to 30 min. between

defrost cycles

Low refrigerant charge Check for leaks, repair and recharge

Metering device or low side restricted Remove source of restriction

(Cool) Insufficient coil airflow Increase air quantity

Check filter—replace if necessary

(Cool) Temperature too low in conditioned area Reset thermostat

(Cool) Outdoor ambient below 40°F Install low-ambient kit

Field-installed filter-drier restricted Replace

Compressor runs but outdoor fan does not NC (normally closed) contacts on defrost board

open Check condition of relay on board

Replace if necessary

IFM does not run Blower wheel not secured to shaft Properly tighten blower wheel to shaft

Insufficient voltage at motor Determine cause and correct

Power connectors not properly sealed Connectors should snap easily; do not force

IFM runs when it should be off

Motor programmed with a delay profile Allow a few min. for motor to shut off

With thermostat in off state, the voltage on G,

Y1,Y, Y2, W with respect to common, should be

1/2 of actual low voltage supply

If measured voltage is more than 1/2, the ther-

mostat is incompatible with motor

If voltage is less than 1/2, the motor has failed

IFM operation is intermittent

Water dripping into motor Verify proper drip loops in connector wires

Connectors not firmly sealed Gently pull wires individually to be sure they are

crimped into the housing

IFM—Indoor Fan Motor

START-UP CHECKLIST

(REMOVE AND STORE IN JOB FILE)

I. PRELIMINARY INFORMATION

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

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

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

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

II. PRE-START-UP

___ Verify that all packing materials have been removed from unit

___ Remove all shipping holddown bolts and brackets per installation instructions

___ Verify that condensate connection is installed per installation instructions

___ Check all electrical connections and terminals for tightness

___ 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 and setscrew tightness

III. START-UP

Supply Voltage: L1-L2 __________ L2-L3 _________ L3-L1 __________

Compressor Amps: L1 __________ L2 _________ L3 __________

Indoor Fan Amps: __________

TEMPERATURE

Outdoor-Air Temperature: __________ DB

Return-Air Temperature: __________ DB __________ WB

Heat Pump Supply Air: __________

Electric Heater Supply Air: __________

PRESSURES

Refrigerant Suction __________ psig

Refrigerant Discharge __________ psig

___ Verify refrigerant charge using charging tables

___ Verify 3-phase scroll compressor is rotating in correct direction

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

Book 1 4

Tab 5a 5a PC 101 Catalog No. 565-057 Printed in U.S.A. Form 50JS,JX-1SI Pg 28 5-00 Replaces: 50JX-2SI

Carrier 50Js Users Manual

50JS to the manual 6989d00c-3bee-46c9-9c46-0510a5127899

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