Carrier 50JS User Manual
Single-Package Heat Pump Units
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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
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]
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
2
C99007
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]
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
3
C99006
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)
B
0.75"
ROOFING MATERIAL
(FIELD SUPPLIED)
17 3/8
TYP.
3.0"
C
D
BASE PAN
BOTTOM SUPPLY
NAILER
INSULATION
(FIELD SUPPLIED)
4.0"
A99340
1 TYP.
B
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
3
SIDE
(2)
SUPPORT B
SUPPORT A (2)
A
END VIEW
A
IN. [MM]
B
IN. [MM]
C
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.
4
7/8
2
D
IN. [MM]
13/16
A99320
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.
A
B
C
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
2"
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
5
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.
6
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
22
1/8 (825)
2....15
3.7
700
10x10
1/8
20x20x1 20x20x1 20x20x1 20x24x1 24x30x1 24x30x1 24x30x1
1....17
12.0
2400
22
1/8 (825)
2....15
3.7
800
10x10
1/4
1....17
12.0
2400
22
1/8 (825)
3....15
3.7
1000
11x10
1/4
2....17
10.3
2800
22
1/4 (1100)
3....15
3.7
1200
11x10
1/2
2....17
10.3
2400
22
1/8 (825)
4....15
3.7
1250
11x10
3/4
2....17
11.6
3300
22
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
22
1/8 (825)
3...15
3.7
800
10x10
1/4
20x20x1 20x20x1 20x24x1 24x30x1 24x30x1 24x30x1
2...17
10.9
2350
22
1/8 (825)
3...15
3.7
1000
11x10
1/4
2...17
10.9
2800
22
1/4 (1100)
4...15
3.7
1200
11x10
1/2
2...17
14.4
2800
22
1/8 (825)
4..15
4.7
1400
11x10
3/4
2...17
14.4
3300
22
1/4 (1100)
4...15
4.7
1600
11x10
3/4
2....17
11.6
3300
22
1/4 (1100)
4....15
4.7
2000
11x10
1
2...17
16.4
3300
22
1/4 (1100)
4...15
5.7
2000
11x10
1
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.
7
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
8
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
9
A00073
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