Carrier 50JS User Manual

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Installation, Start-Up and Service Instructions

NOTE: Read the entire instruction manual before starting the

installation. Index

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

General

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

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

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

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

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

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

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

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

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

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

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

SYSTEM INFORMATION.......................................................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.

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 andfilters. 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.

.................................................................................4

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

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

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

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

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

Converting Horizontal DischargeUnits to Downflow (Vertical)

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

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

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

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

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

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

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

SAFETY CONSIDERATIONS

50JS,JX018-060

C99001

Fig. 1—Model 50JS/JX

Improper installation, adjustment, alteration, service, maintenance, 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, CAUTION, 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 wastewater codes andother applicablelocal codes.

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

Page 2

REQUIRED CLEARANCE TO COMBUSTIBLE MATL.

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.

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

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]

INCHES [mm]

UNIT WEIGHT

lb kg X Y Z

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

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.

UNIT HEIGHT

IN. [MM]

"A"

CENTER OF GRAVITY

IN. [MM]

INCHES [mm]

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

C99007

Page 3

REQUIRED CLEARANCE TO COMBUSTIBLE MATL.

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.

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

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]

INCHES [mm]

UNIT WEIGHT

lb kg X Y Z

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

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.

UNIT HEIGHT

IN. [MM]

"A"

CENTER OF GRAVITY

IN. [MM]

INCHES [mm]

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

C99006

Page 4

46 3/16

44 5/16

SIDE PANEL

SUPPORT RIB(S)

SEAL STRIP (FACTORY SUPPLIED)

COUNTER FLASHING (FIELD SUPPLIED)

ROOFING FELT (FIELD SUPPLIED)

CANT STRIP (FIELD SUPPLIED)

0.75"

ROOFING MATERIAL (FIELD SUPPLIED)

17 3/8 TYP.

3.0"

BASE PAN

BOTTOM SUPPLY

NAILER

INSULATION (FIELD SUPPLIED)

4.0"

A99340

1 TYP.

END (2)

DECK PAN (INSULATED)

UNIT SIZE ODS CATALOG NUMBER

50JS018-042 50JX024-036

50JS048-060 50JX042-060

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] 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.

Before performing service or maintenance operations on system, turn offmain power to unit. Turnoff 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

SIDE (2)

SUPPORT B

SUPPORT A (2)

END VIEW

IN. [MM]

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 onthe unit identification plate. Check this information against shipping papers.

7/8

IN. [MM]

13/16

A99320

Page 5

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: Thegasketing ofthe unitto 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.

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B B-C A-C

1/4 1/4 1/4

C99065

Fig. 5—Unit Leveling Tolerances

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.

OPTIONAL

RETURN

AIR

OPENING

EVAP. COIL COND. COIL

OPTIONAL

SUPPLY

AIR

OPENING

C99096

Fig. 6—Slab Mounting Detail

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 ofthis equipmentcan behazardous formany 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.

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 discharge.

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

HANDHOLD

HOOK

FEED

C99067

Fig. 7—Threading Belt

Page 6

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).

914-137"

“A”

“B”

INSTALL SAFETY STRAPS TO RIGGING CLEVIS AT 4 RIGGING BRACKETS

PLACE RIGGING BRACKET ASSEMBLY IN 4 HAND HOLES AND INSTALL TIE DOWN STRAP AROUND PERIMETER OF UNIT AND THROUGH

SEE DETAIL A

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

SPACE IN BRACKET ASSEMBLY

(36"-54")

SCALE 0.250

TIGHTEN STRAPPING SECURELY WITH TENSION BUCKLE

DETAIL A

C99075

Fig. 8—Suggested Rigging

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) 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.

CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW (VERTICAL) DISCHARGE UNITS

Before performing service or maintenance operations on system, turn offmain power to unit. Turnoff accessory heater power switch if applicable. Electrical shock could cause serious injury or death.

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 andventilating systems,NFPA 90A or residence-type, NFPA 90B and/or local codes and ordinances.

Select and sizeductwork, supply-air registers, and return air grilles according to ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) recommendations.

The unit hasduct flanges on the supply- and return-airopenings on the side of the unit.

When designing and installing ductwork, consider the following:

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.

Page 7

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)

OUTDOOR FAN

Nominal Airflow (CFM)

Diameter

Motor HP (RPM)

INDOOR COIL

Rows...Fins/in.

Face Area (Sq Ft)

INDOOR BLOWER

Nominal Airflow (CFM)

Size (in.)

Motor (HP)

RETURN-AIR FILTERS (in.)

Throwaway

1....17

10.2

2400

1/8 (825)

2....15

3.7

700

10x10

1/8

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

1....17

12.0

2400

1/8 (825)

2....15

3.7

800

10x10

1/4

1....17

12.0

2400

1/8 (825)

3....15

3.7

1000

11x10

1/4

2....17

10.3

2800

1/4 (1100)

3....15

3.7

1200

11x10

1/2

2....17

10.3

2400

1/8 (825)

4....15

3.7

1250

11x10

3/4

2....17

11.6

3300

1/4 (1100)

3....15

4.7

1600

11x10

3/4

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)

OUTDOOR FAN

Nominal Airflow (CFM)

Diameter

Motor HP (RPM)

INDOOR COIL

Rows...Fins/in.

Face Area (Sq Ft)

INDOOR BLOWER

Nominal Airflow (CFM)

Size (in.)

Motor (HP)

RETURN-AIR FILTERS (in.)

Throwaway

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

1...17

14.6

2350

1/8 (825)

3...15

3.7

800

10x10

1/4

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

2...17

10.9

2350

1/8 (825)

3...15

3.7

1000

11x10

1/4

2...17

10.9

2800

1/4 (1100)

4...15

3.7

1200

11x10

1/2

2...17

14.4

2800

1/8 (825)

4..15

4.7

1400

11x10

3/4

2...17

14.4

3300

1/4 (1100)

4...15

4.7

1600

11x10

3/4

2....17

11.6

3300

1/4 (1100)

4....15

4.7

2000

11x10

2...17

16.4

3300

1/4 (1100)

4...15

5.7

2000

11x10

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.

Page 8

RETURN AIR

INDOOR THERMOSTAT

1” MIN.

TRAP OUTLET

2” MIN.

TOP COVER

FROM POWER SOURCE

DISCONNECT PER NEC

C99061

Fig. 9—Typical Installation

Accessory Duct Covers

C99030

Fig. 10—50JX with Duct Covers On

(Unit shown with optional louvered grille)

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 installations. Install a field-supplied condensate trap at end of condensate connection to ensure proper drainage. Make sure that the outlet of the trap is at least 1 in. lower than the drain-pan condensate connection to prevent the pan 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 oris field-supplied.Make surethat theoutlet ofthe 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.

C99013

Fig. 11—Condensate Trap

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 Protection Association (latest edition) (in Canada, Canadian Electrical 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 connections 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 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 Tables 3A and 3B for electrical data).

The field-supplied disconnectmay be mounted on theunit 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 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.

ROUTING POWER LEADS INTO UNIT — Use only copper wire between disconnect and unit. The high-voltage leads should

Page 9

FIELD SPLICE TERMINAL (MARKED) TERMINAL (UNMARKED) SPLICE SPLICE (MARKED) FACT OR Y WIRING FIELD CONTROL WIRING FIELD POWER WIRING ACCESSORY OR OPTIONAL WIRING TO INDICATE COMMON POTENTIAL ONLY: NOT TO REPRESENT WIRING

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

AHA ADJUSTABLE HEAT ANTICIPATOR C CONTACTOR CAP CAPACITOR CB CIRCUIT BREAKER COMP COMPRESSOR MOTOR CTD COMPRESSOR TIME DELA Y DB DEFROST BOARD DFT DEFROST THERMOST AT 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

Fig. 12—Wiring Schematics

A00073

Page 10

Fig. 13—Wiring Schematics

A00074

Page 11

LEGEND

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.

Fig. 14—Wiring Schematics

AHA ADJUSTABLE HEAT ANTICIPATOR C CONTACTOR CAP CAPACITOR CB CIRCUIT BREAKER COMP COMPRESSOR MOTOR CTD COMPRESSOR TIME DELA Y DB DEFROST BOARD DFT DEFROST THERMOST AT 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

A00075

Page 12

Table 3A—Electrical Data—50JS

UNIT 50JS

SIZE

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

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

030

036

042

048

060

* 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.

V-PH-HZ

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

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

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

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

460-3-60 414 506 5.5 40 0.8 1.9

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

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

460-3-60 414 506 6.7 45 0.8 1.8

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

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

460-3-60 414 506 7.1 53 0.8 1.8

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

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

460-3-60 414 506 8 63 0.8 3.2

VOLTAGE

RANGE

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

COMPRESSOR ODFM IDFM ELECTRIC HEAT POWER SUPPLY

-/-

3.8/5

7.5/10

-/-

3.8/5

7.5/10

-/-

3.8/5

7.5/10

11.3/15

-/-

3.8/5

7.5/10

11.3/15

-/-

3.8/5

7.5/10

11.3/15

-/-

3.8/5

7.5/10

11.3/15

-/5

10 15

-/5

10 15 20

-/-

3.8/5

7.5/10

11.3/15

15/19.94

-/5

10 15

15-20

-/-

3.8/5

7.5/10

11.3/15 15/20

-/-

3.8/5

7.5/10

11.3/15

15/19.94

-/5

10 15 20

-/-

3.8/5

7.5/10

11.3/15 15/20

-/-

3.8/5

7.5/10

11.3/15

15/19.94

-/5

10 15 20

-/-

18.1/20.8

36.1/41.7

-/-

18.1/20.8

36.1/41.7

-/-

18.1/20.8

36.1/41.7

54.2/62.5

-/-

10.4/12

20.8/24.1

31.3/36.1

-/-

18.1/20.8

36.1/41.7

54.2/62.5

-/-

10.4/12

31.3/36.1

36.1/41.7

-/-

6.0

12.0

18.0

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

-/-

10.4/12

20.8/24.1

31.3/36.1

41.6/48

-/-

6.0

12.0

18.0

24.1

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

-/-

10.4/12

20.8/24.1

31.3/36.1

41.6/48.0

6.0

12.0

18.0

24.1

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

-/-

10.4/12

20.8/24.1

31.3/36.1

41.6/48.0

6.0

12.0

18.0

24.1

14.0/14.0

24.8/28.3

47.4/54.3

18.9/18.9

25.1/28.5

47.6/54.6

21.3/21.3

25.1/28.5

47.6/54.6

72.8/83.3

15.3/15.3

15.5/17.5

28.6/32.6

44.2/50.2

26.6/26.6

27.7/31.2

50.3/57.2

72.8/83.3

18.0/18.0

18.2/20.2

44.2/50.2

47.8/54.7

9.6

9.9

17.4

24.9

30.5/30.5

30.5/30.8

49.9/56.8

72.4/82.9

95.0/108.9

20.2/20.2

30.8/34.8

43.8/49.9

56.7/64.7

11.0

17.3

24.8

32.3

35.5/35.5

49.5/56.5

72.1/82.5

94.6/108.5

22.6/22.6

30.4/34.4

43.5/49.5

56.3/64.3

11.5

17.3

24.8

32.3

43.7/43.7

52.9/59.8

75.4/85.9

98.0/111.9

32.0/32.0

33.8/37.8

46.8/52.9

59.7/67.7

14.0

19.0

26.6

34.1

20/20 25/25 50/60

25/25 25/30 50/60

20/20 20/20 30/35 45/60

35/35 35/35 60/60

25/25 25/25 35/40 45/60

15 15 20 25

40/40 40/40 50/60

25/25 25/25 35/35 45/50

15 15 20 25 35

45/45 45/45 50/60

30/30 30/30 35/35 45/50

15 15 20 25 35

60/60 60/60 60/60

40/40 40/40 35/40 50/60

20 20 20 30 35

80/90

90.0

100/110

60/70

90.0

100/110

60/70

90.0

100/125

60/70

Page 13

→Table 3B—Electrical Data—50JX

UNIT 50JX

SIZE

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

030

036

042

048

060

* 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.

V-PH-HZ

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

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

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

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

460-3-60 414 506 5.4 37.5 0.9 1.9

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

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

460-3-60 414 506 5.8 44 0.9 2.0

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

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

460-3-60 414 506 6.8 44 0.9 2

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

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

460-3-60 414 506 9 62 0.9 3.2

VOLTAGE

RANGE

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

COMPRESSOR ODFM IDFM ELECTRIC HEAT POWER SUPPLY

-/-

3.75/5.0

7.5/10

-/-

3.75/5.0

7.5/10

11.3/15

-/-

3.75/5.0

7.5/10

11.3/15

-/-

3.75/5.0

7.5/10

11.3/15

-/-

3.75/5.0

7.5/10

11.3/15

--/5

10 15

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/5

10 15 20

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/5

10 15 20

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/-

3.75/5.0

7.5/10

11.3/15

15.0/20.0

-/5

10 15 20

-/-

18.1/20.8

36.1/41.7

-/-

18.1/20.8

36.1/41.7

54.2/62.5

-/-

10.4/12.0

20.8/24.1

31.3/36.1

-/-

18.1/20.8

36.1/41.7

54.2/62.5

-/-

10.4/12.0

20.8/24.1

31.3/36.1

--/6

12 18

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

-/-

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48.0

-/6

12 18 24

-/-

18.1/20

36.1/41.7

54.2/62.5

72.2/83.8

-/-

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48

-/6

12 18 24

-/-

18.1/20.8

36.1/41.7

54.2/62.5

72.2/83.3

-/-

10.4/12.0

20.8/24.1

31.3/36.1

41.6/48.0

-/6

12 18 24

16.4/16.4

25.1/28.5

47.6/54.6

20.5/20.5

25.2/28.7

47.8/54.7

72.2/82.6

16.0/16.0

16.0/17.7

28.7/32.7

41.7/47.7

26.1/26.1

27.1/30.5

49.6/56.6

72.2/82.6

19.2/19.2

19.2/19.5

47.8/54.7

43.6/49.6

9.6

9.9

17.4

24.9

28.0/28.0

28.0/31.2

50.3/57.2

72.8/83.3

95.4/109.3

20.5/20.5

31.2/35.2

44.2/50.2

57.1/65.1

10.2

17.5

25.1

32.6

35.0/35.0

50.3/57.2

72.8/83.3

95.4/109.3

22.6/22.6

31.2/35.2

44.2/50.2

57.1/65.1

11.4

17.5

25.1

32.6

43.6/43.6

52.9/59.8

75.4/85.9

98.0/111.9

29.2/29.2

33.8/37.8

46.8/52.9

59.7/67.7

15.4

19.0

26.6

34.1

20/20 25/30 50/60

25/25 25/30 50/60

20/20 20/20 30/35 45/50

35/35 35/35 50/60

25/25 25/25 35/35 45/50

15 15 20 25

35/35 35/35 60/60

25/25 25/25 35/40 45/60

15 15 20 30 35

45/45 45/45 60/60

30/30 30/30 35/40 45/60

15 15 20 30 35

60/60 60/60 60/60

35/35 35/35 35/40 50/60

20 20 20 30 35

80/90

90.0

100/110

60/70

90.0

100/110

60/70

90.0

100/125

60/70

Page 14

LEGEND

FLA — Full Load Amps LRA — Locked Rotor Amps MCA — Minimum CircuitAmps 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 voltage is greater than 2%.

the percentage of voltage imbalance. % Voltage imbalance

max voltage deviation from average voltage

= 100 x

Use the following formula to determine

average voltage

Fig. 15—Electrical Data Legend

EXAMPLE: Supply voltage is 460-3-60.

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

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.

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

452=5v 457=7v 455=2v

= 1.53%

457

452 + 464 + 455

1371

= 457

C99024

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).

THERMOSTAT

AND SUBBASE

UNIT CONTROL POWER

BRN

ORN

RED

GRN

YEL

WHT

SPLICE BOX

C99056

Fig. 16—Control Connections

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 inthe 24-vcircuit; seethe 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.

GROUND LUG

(IN SLPICE BOX)

GROUND

LEAD

SINGLE-PHASE

L1 CONNECTIONS TO DISCONNECT PER NEC

3-PHASE CONNECTIONS

LEGEND

NOTE: Use copper wire only.

NEC – National Electrical Code

Field Wiring Splice Connections

Fig. 17—Line Power Connections

BLK

YEL

BLU

C99057

24 V Circuit Breaker

24 V olt Compartment

C99070

Fig. 18—Control Wiring Plate

Page 15

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. 19—Transformer Label

C99058

SPECIAL PROCEDURES FOR 208-V OPERATION

1. Disconnect the yellow primary lead (w110) from the transformer. 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 provideany 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.

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.

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 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. 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.

MOTOR

1/8" MAX BETWEEN MOTORAND FAN HUB

MOTOR SHAFT

FAN GRILLE

C99009

Fig. 20—Fan Blade Clearance

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 volumetriccharging 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 OPERATION — 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.

Page 16

OUTDOOR COIL

ACCUMULATOR

COMPRESSOR

Metering

Position

Bypass

Position

LCS

INDOOR COIL

LEGEND

LCS – Loss of Charge Switch

Accurater® Metering Device Arrow indicates direction of flow

C99027

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.

Fig. 21—Typical Heat Pump Operation, Heating Mode

INDOOR COIL

ACCUMULATOR

LEGEND

COMPRESSOR

OUTDOOR COIL

Bypass

Position

Metering

Position

LCS

LCS – Loss of Charge Switch

Accurater

Metering Device

Arrow indicates direction of flow

C99028

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.

Fig. 22—Typical Heat Pump Operation, Cooling Mode

Page 17

Table 4A—Wet Coil Air Delivery

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

UNIT MOTOR SPEED

Low

018

024

* Air delivery valuesare basedon operating voltage of 230 v or 460 v,wet coil, without filter or electric heater. Deduct filter and electricheater 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.

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

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

Cfm---821696575-----

Watts -----------

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

Watts ----283274267----

Cfm----848707555----

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

Cfm--971821696------

Watts ----368366365360---

Cfm----957872785688---

Watts -------425414--

Cfm-------891735--

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

Cfm928882802--------

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

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

Watts ----469458449442---

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

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

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

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

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

Watts -----776761744725706689

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

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

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

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

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

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

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

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

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

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

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

Watts -----799782773756704-

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

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

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

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

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

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

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

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

EXTERNAL STATIC PRESSURE (IN. WG)

2. Place SYSTEM switch in COOL position and FAN switch in AUTO position. Setcontrol below room temperature. Observe that cooling cycleshuts down when control settingis 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. Observe that unit operates in Cooling mode when temperature control is setto ‘‘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 oriented. 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.

Page 18

Table 4B—Wet Coil Air Delivery

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

UNIT MOTOR SPEED

Low

024

* Air delivery valuesare basedon operating voltage of 230 v or 460 v,wet coil, without filter or electric heater. Deduct filter and electricheater 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.

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

Low

Med

High

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

Cfm923844754669-------

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

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

Watts ------447439431423-

Cfm------968869765659-

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

Cfm963929781--------

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

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

Watts ----469449435428---

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

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

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

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

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

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

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

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

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

Watts ----686661634606577547517

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

Watts -------757730704682

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

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

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

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

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

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

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

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

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

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

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

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

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

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

EXTERNAL STATIC PRESSURE (IN. WG)

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. 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 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.

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 techniques. 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.

Page 19

689

100

620

551

483

414

SUCTION LINE PRESSURE (PSIG)

345

SUCTION LINE PRESSURE (KILOPASCALS)

276

(018) 60HZ CHARGING CHART

OUTDOOR TEMP ° F ° C

125 52

115 46

105 41

95 35 85 29

75 24 65 18

55 13

45 7

758

110

689

100

620

551

483

SUCTION LINE PRESSURE (PSIG)

414

SUCTION LINE PRESSURE (KILOPASCALS)

345

(024) 60HZ CHARGING CHART

OUTDOOR TEMP ° F ° C

125 52 115 46

105 41

95 35 85 29

75 24

65 18 55 13

45 7

207

20.0 30.0 40.0 50.0 60.0 70.0 80.0 SUCTION LINE TEMPERATURE (°F)

-7 -1 4 10 16 21 27 SUCTION LINE TEMPERATURE (°C)

50JS500087

C00026

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

OUTDOOR TEMP ° F ° C

125 52 115 46 105 41

95 35 85 29

75 24 65 18

55 13

45 7

50JS500089

C00028

689

100

620

551

483

414

SUCTION LINE PRESSURE (PSIG)

345

SUCTION LINE PRESSURE (KILOPASCALS)

276

207

20.0 30.0 40.0 50.0 60.0 70.0 80.0 SUCTION LINE TEMPERATURE (°F)

-7 -1 4 10 16 21 27 SUCTION LINE TEMPERATURE (°C)

(030) 60HZ CHARGING CHART

Fig. 25—Cooling Charging Chart, 50JS030 Units

276

20.0 30.0 40.0 50.0 60.0 70.0 80.0 SUCTION LINE TEMPERATURE (°F)

-7 -1 4 10 16 21 27 SUCTION LINE TEMPERATURE (°C)

50JS500088

C00027

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

OUTDOOR TEMP ° F ° C

125 52 115 46 105 41

95 35

85 29

75 24

65 18

55 13

45 7

50JS500090

C00029

689

100

620

551

483

414

SUCTION LINE PRESSURE (PSIG)

345

SUCTION LINE PRESSURE (KILOPASCALS)

276

207

20.0 30.0 40.0 50.0 60.0 70.0 80.0 SUCTION LINE TEMPERATURE (°F)

-7 -1 4 10 16 21 27 SUCTION LINE TEMPERATURE (°C)

(036) 60HZ CHARGING CHART

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

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 withoptional electricheat, theairflow 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

Page 20

OUTDOOR TEMP ° F ° C

125 52 115 46 105 41

95 35 85 29

75 24 65 18

55 13

45 7

50JS500091

689

100

620

551

483

414

SUCTION LINE PRESSURE (PSIG)

345

SUCTION LINE PRESSURE (KILOPASCALS)

276

207

20.0 30.0 40.0 50.0 60.0 70.0 80.0 SUCTION LINE TEMPERATURE (°F)

-7 -1 4 10 16 21 27 SUCTION LINE TEMPERATURE (°C)

(042) 60HZ CHARGING CHART

C00030

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

OUTDOOR TEMP ° F ° C

125 52 115 46

105 41

95 35 85 29 75 24

65 18 55 13

45 7

50JS500092

689

100

620

551

483

414

SUCTION LINE PRESSURE (PSIG)

345

SUCTION LINE PRESSURE (KILOPASCALS)

276

207

20.0 30.0 40.0 50.0 60.0 70.0 80.0 SUCTION LINE TEMPERATURE (°F)

-7 -1 4 10 16 21 27 SUCTION LINE TEMPERATURE (°C)

(048) 60HZ CHARGING CHART

C00031

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

OUTDOOR TEMP ° F ° C

125 52 115 46 105 41

95 35 85 29

75 24 65 18

55 13

45 7

50JS500093

689

100

620

551

483

414

SUCTION LINE PRESSURE (PSIG)

345

SUCTION LINE PRESSURE (KILOPASCALS)

276

207

20.0 30.0 40.0 50.0 60.0 70.0 80.0 SUCTION LINE TEMPERATURE (°F)

-7 -1 4 10 16 21 27 SUCTION LINE TEMPERATURE (°C)

(060) 60HZ CHARGING CHART

C00032

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

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 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 User’s Manual. FAILURE TO HEED THIS WARNING COULD RESULT IN SERIOUS INJURY OR DEATH AND POSSIBLE DAMAGE TO THIS EQUIPMENT.

Page 21

80.070.060.050.040.030.0

OUTDOOR

TEMP

F C 125 52 115 46 105 41 95 35

85 29

75 24

65 18

55 13

45 7

50JX500219

689 100.0

620

90.0

551

80.0

483

70.0

414

60.0

345

50.0

SUCTION LINE PRESSURE (PSIG)

276

40.0

SUCTION LINE PRESSURE (KILOPASCALS)

207

30.0

20.0

-7 272116104-1

(024) 60 Hz CHARGING CHART

SUCTION LINE TEMPERATURE (DEG. F)

SUCTION LINE TEMPERATURE (DEG. C)

C99031

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

80.070.060.050.040.030.0

OUTDOOR

TEMP

F C 125 52 115 46 105 41

95 35

85 29

75 24

65 18

55 13

45 7

50JX500221

C99033

689 100.0

620

90.0

551

80.0

483

70.0

414

60.0

345

50.0

SUCTION LINE PRESSURE (PSIG)

276

40.0

SUCTION LINE PRESSURE (KILOPASCALS)

207

30.0

20.0

-7 272116104-1

(036) 60 Hz CHARGING CHART

SUCTION LINE TEMPERATURE (DEG. F)

SUCTION LINE TEMPERATURE (DEG. C)

Fig. 32—Cooling Charging Chart, 50JX036 Units

80.070.060.050.040.030.0

OUTDOOR

TEMP

F C 125 52 115 46 105 41 95 35 85 29 75 24 65 18

55 13

45 7

50JX500223

C99035

689 100.0

620

90.0

551

80.0

483

70.0

414

60.0

345

50.0

SUCTION LINE PRESSURE (PSIG)

276

40.0

SUCTION LINE PRESSURE (KILOPASCALS)

207

30.0

20.0

-7 272116104-1

(048) 60 Hz CHARGING CHART

SUCTION LINE TEMPERATURE (DEG. F)

SUCTION LINE TEMPERATURE (DEG. C)

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

689 100.0

620

90.0

551

80.0

483

70.0

414

60.0

345

50.0

SUCTION LINE PRESSURE (PSIG)

276

40.0

SUCTION LINE PRESSURE (KILOPASCALS)

207

30.0

20.0

-7 272116104-1

(030) 60 Hz CHARGING CHART

SUCTION LINE TEMPERATURE (DEG. F)

SUCTION LINE TEMPERATURE (DEG. C)

115 46

95 35

75 24

55 13

80.070.060.050.040.030.0

OUTDOOR

TEMP

F C

125 52

105 41

85 29

65 18

45 7

50JX500220

C99032

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

689 100.0

620

90.0

551

80.0

483

70.0

414

60.0

345

50.0

SUCTION LINE PRESSURE (PSIG)

276

40.0

SUCTION LINE PRESSURE (KILOPASCALS)

207

30.0

20.0

-7 272116104-1

(042) 60 Hz CHARGING CHART

SUCTION LINE TEMPERATURE (DEG. F)

SUCTION LINE TEMPERATURE (DEG. C)

115 46

95 35

75 24

55 13

80.070.060.050.040.030.0

OUTDOOR

TEMP

F C

125 52

105 41

85 29

65 18

45 7

50JX500222

C99034

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

115 46

95 35

75 24

55 13

80.070.060.050.040.030.0

OUTDOOR

TEMP

F C

125 52

105 41

85 29

65 18

45 7

50JX500224

C99036

689 100.0

620

90.0

551

80.0

483

70.0

414

60.0

345

50.0

SUCTION LINE PRESSURE (PSIG)

276

40.0

SUCTION LINE PRESSURE (KILOPASCALS)

207

30.0

20.0

-7 272116104-1

(060) 60 Hz CHARGING CHART

SUCTION LINE TEMPERATURE (DEG. F)

SUCTION LINE TEMPERATURE (DEG. C)

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

Page 22

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 disconnection 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 necessary.

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 thiswarning could cause personal injury or death.

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 thedrain 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 is1/8 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 instrumentation. 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 connections and the unit base for oil accumulation annually. Detecting oil generally indicates a refrigerant leak.

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

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

Page 23

C99097

Fig. 36—Refrigerant Circuit

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 protect metering devices) aremade ofwire meshand arelocated 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 compression 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 seton AUTO, the TDR isprobably 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

FEEDER TUBE

STUB TUBE

DEFROST THERMOST AT

C99029

Fig. 37—Defrost Thermostat

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.

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.

Page 24

Table 5—Cooling and Heating Troubleshooting Chart

SYMPTOM CAUSE REMEDY

Compressor and outdoor fan will not start

Compressor will not start but condenser fan runs

Three-phase scroll compressor (size 030060units) makes excessive noise, and there may be a low pressure differential

Compressor cycles (other than normally satisfying thermostat)

Compressor operates continuously

Excessive head pressure

Head pressure too low

Excessive suction pressure

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 Insufficient line voltage Determine cause and correct Incorrect or faulty wiring Check wiring diagram and rewire correctly

Thermostat setting too high

Units have a 5-min. time delay

Faulty wiring or loose connections in compressor circuit

Compressor motor burned out, seized, or internal overload open

Defective run capacitor, overload, or PTC (positive temperature coefficient) thermistor

One leg of 3-phase power dead Low input voltage (20% low) Determine cause and correct Scroll compressor is rotating in the wrong direc-

tion

Refrigerant overcharge or undercharge 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 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 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

Air in system Outdoor coil dirty or restricted Clean coil or remove restriction

Dirty air filter Replace filter Dirty indoor or outdoor coil Clean coil Refrigerant overcharged Recover excess refrigerant

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

Indoor or outdoor air restricted or air short-cycling Determine cause and correct Low refrigerant charge Check for leaks, repair and recharge Compressor valves leaking Replace compressor Restriction in liquid tube Remove restriction

(Heat) Outdoor coil frosted (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

Replace component

Lower thermostat setting below room temperature

DO NOT bypass this compressor time delay—wait for 5 min. until time-delay relay is deenergized

Check wiring and repair or replace Determine cause

Replace compressor Determine cause and replace Replace fuse or reset circuit breaker

Determine cause

Correct the direction of rotation by reversing the 3-phase power leads to the unit

Recover refrigerant, evacuate system, and recharge to capacities shown on nameplate

Determine cause and replace

Check defrost time settings Reset as necessary Check defrost temperature switch Replace as necessary

Recover refrigerant, evacuate system, and recharge

Move timer on control board to 30 min. between defrost cycles

Page 25

Cooling and Heating Troubleshooting Chart (cont’d)

SYMPTOM CAUSE REMEDY

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

(Heat) Outdoor coil frosted Low refrigerant charge Check for leaks, repair and recharge

Metering device or low side restricted Remove source of restriction (Cool) Insufficient coil airflow (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 IFM does not run Blower wheel not secured to shaft Properly tighten blower wheel to shaft

IFM runs when it should be off

IFM operation is intermittent

IFM—Indoor Fan Motor

NC (normally closed) contacts on defrost board open

Insufficient voltage at motor Determine cause and correct Power connectors not properly sealed Connectors should snap easily; do not force 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

Water dripping into motor Verify proper drip loops in connector wires Connectors not firmly sealed

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

Move timer on control board to 30 min. between defrost cycles

Increase air quantity Check filter—replace if necessary

Check condition of relay on board Replace if necessary

If measured voltage is more than 1/2, the thermostat is incompatible with motor If voltage is less than 1/2, the motor has failed

Gently pull wires individually to be sure they are crimped into the housing

___ Verify refrigerant charge using charging tables ___ Verify 3-phase scroll compressor is rotating in correct direction

252627

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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