Carrier 50HJQ014 Dimensions and installation guide

Installation, Start-Up
and Service Instructions
CONTENTS Page
SAFETY CONSIDERATIONS ..................1
INSTALLATION ............................1-10
Step 1 — Provide Unit Support ...............1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit .................1
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork ...........3
Step 4 — Make Unit Duct Connections ........3
Step5—TrapCondensate Drain .............3
Step 6 — Make Electrical Connections ........3
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 7 — Make Outdoor-Air Inlet
Adjustments ...............................8
• MANUAL OUTDOOR-AIR DAMPER
• OPTIONAL FACTORY-INSTALLED
ECONOMIZER
Step 8 — Install Outdoor-Air Hood ............9
START-UP ................................10-16
SERVICE ..................................16-22
TROUBLESHOOTING ......................22-25
START-UP CHECKLIST .....................CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per-
sonnel. When working on air-conditioning equipment, ob-
serve 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 ex-
tinguishers available for all brazing operations.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
INSTALLATION
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb
or adapter in accordance with instructions shipped with the
accessory. Accessory roof curb or adapter and information
required to field fabricate a roof curb or adapter are shown
in Fig. 1 and 2. Install insulation, cant strips, roofing, and
counter flashing as shown. Ductwork can be secured to roof
curb before unit is set in place.
IMPORTANT: The gasketing of the unit to the roof
curb or adapter is critical for a watertight seal. Install
gasket supplied with the roof curb or adapter as shown
in Fig. 1. Improperly applied gasket can result in air
leaks and poor unit performance.
Curb or adapter should be level. This is necessary to per-
mit unit drain to function properly. Unit leveling tolerance is
± 5 mm per linear m (±
1
⁄ 16 in. per linear ft) in any direction.
Refer to Accessory Roof Curb or Adapter Installation In-
structions for additional information as required.
ALTERNATE UNIT SUPPORT —When the curb or adapter
cannot be used, support unit with sleepers using unit curb or
adapter support area. If sleepers cannot be used, support long
sides of unit with a minimum of 3 equally spaced 100-mm
x 100-mm (4-in. x 4-in.) pads on each side.
Step 2 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with transportation
agency. Keep unit upright, and do not drop. Use spreader
bars over unit to prevent sling or cable damage. Rollers may
be used to move unit across a roof. Level by using unit frame
as a reference; leveling tolerance is±5mmperlinear m
(±
1
⁄ 16 in. per linear ft) in any direction. See Fig. 1 for ad-
ditional leveling tolerance information. Unit operating weight
is shown in Tables 1A and 1B.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Provide clearance around and above unit
for airflow, safety, and service access (Fig. 4).
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
ROOF MOUNT — Check building codes for weight distri-
bution requirements.
50HJQ014,016
Single-Package Rooftop
Heat Pump Unit
50 Hz
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 Catalog No. 005-035 Printed in U.S.A. Form 50HJQ-C2SI Pg 1 3-97 Replaces: 50HJQ-C1SI

ACCESSORY
PACKAGE NO. CURB HEIGHT DESCRIPTION ‘‘A’’ ‘‘B’’ ‘‘C’’
50PQ900221 18-29
(305) Standard Curb — 149High ———
50PQ900141 28-09
(610) Standard Curb
for Units Requiring
High Installation ———
50PQ900151 28-09
(610) Horizontal Supply and Return Curb 58-69 (1676) 08-2
1
⁄ 2 9
(64) 18-69 (457)
50DP900211 18-119
(584) Pre-Assembled,
High-Static,
Horizontal Adapter 68-29
(1880) 08-6
1
⁄ 4 9
(159) 18-2
5
⁄ 8 9
(371)
LEGEND
COMP SECT. — Compressor Section
NOTES:
1. Roof curb accessory is shipped unassembled.
2. Insulated panels, 13-mm (
1
⁄ 2 -in.) thick neoprene-coated, 0.9 kg (2 lb) density.
3. Dimensions in ( ) are in millimeters.
4. Direction of airflow.
5. Roof curb: 1.2 mm (18 gage) steel.
6. Attach all ductwork to roof curb. Fig. 1 — Roof Curbs and Horizontal Adapter Details
NOTE: To prevent the hazard of stagnant water build-up in the drain pan of the
indoor-air section, unit can only be pitched as shown.
2

Step 3 — Field Fabricate Ductwork — Secure all
ducts to building structure. Use flexible duct connectors be-
tween unit and ducts as required. Insulate and weatherproof
all external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
The 50HJQ units with electric heat require a 25-mm
(1-in.) clearance for the first 600 mm (24 in.) of ductwork.
Outlet grilles must not lie directly below unit discharge.
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90 de-
gree 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. Due to electric heater, supply duct
will require 90 degree elbow.
NOTE: For units equipped with electric heat, a 90-degree
elbow must be provided in the supply ductwork to comply
with UL(Underwriters’Laboratories) codes for use with elec-
tric heat.
Step 4 — Make Unit Duct Connections — Unit
is shipped for through-the-bottom duct connections.
Ductwork openings are shown in Fig. 5. Field-fabricated con-
centric ductwork may be connected as shown in Fig. 6 and
7. Attach all ductwork to roof curb and roof curb basepans.
Refer to installation instructions shipped with accessory roof
curb or adapter for more information.
Step5—TrapCondensate Drain — See Fig. 4
and 8 for drain location. Plug is provided in drain hole and
must be removed when unit is operating. One
3
⁄ 4 -in. half cou-
pling is provided inside unit indoor air section for conden-
sate drain connection. A 216 mm x 19 mm (8
1
⁄ 2 in. x
3
⁄ 4 -in.)
diameter nipple and a 51 mm x 19 mm (2-in. x
3
⁄ 4 -in.) di-
ameter pipe nipple are coupled to standard 19 mm (
3
⁄ 4 -in.)
diameter elbows to provide a straight path down through holes
in unit base rails (see Fig. 9). A trap at least 100 mm (4-in.)
deep must be used.
Step 6 — Make Electrical Connections
FIELD POWER SUPPLY — Unit is factory wired for
400 v.
When installing units, provide a disconnect of adequate
size per NEC (National Electrical Code, U.S.A.) require-
ments (Table 2).
All field wiring must comply with NEC and local
requirements.
Route power lines through control box access panel or unit
basepan (Fig. 4) to connections as shown on unit wiring dia-
gram and Fig. 10.
Operating voltage to compressor must be within voltage
range indicated on unit nameplate. Voltages between phases
must be balanced within 2% and the current must be bal-
anced within 10%.
Use the following formula to determine the percentage of
voltage imbalance.
Percentage of Voltage Imbalance
= 100 x max voltage deviation from average voltage
average voltage
Example: Supply voltage is 400-3-50.
AB = 392 v
BC = 404 v
AC = 395 v
Average Voltage = 392 + 404 + 395
3
=1191
3
= 397
Determine maximum deviation from average voltage:
(AB) 397 − 392 = 5 v
(BC) 404 − 397 = 7 v
(AC) 397 − 395 = 2 v
Maximum deviation is 7 v.
Determine the percentage of voltage imbalance:
Percentage of Voltage Imbalance = 100 x 7
397
= 1.76%
This amount of phase imbalance is satisfactory as it is be-
low the maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance
is more than 2%, contact your local electric utility com-
pany immediately.
Unit failure as a result of operation on improper line volt-
age or excessive phase imbalance constitutes abuse and may
cause damage to electrical components.
NOTE: Dimensions are in millimeters.
Fig. 2 — Horizontal Supply/Return Curb and
Horizontal Adapter Details
UNIT MAXIMUM
SHIPPING WEIGHT
Lb Kg
014 2092 948
016 2402 1089
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Tables 1A and 1B for unit operating weights.
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown. Use corner post from pack-
aging to protect coil from damage. Use bumper boards for spreader bars.
5. Weights do not include optional economizer. See Tables 1A and 1B for econo-
mizer weight.
6. Weights given are for aluminum indoor coil plate fins and copper outdoor coil plate
fins. Weights of other metal combinations are listed in Tables 1A and 1B.
All panels must be in place when rigging.
Fig. 3 — Rigging Details
3

Table 1A — Physical Data, SI
UNIT SIZE 50HJQ 014 016
OPERATING WT (kg)
Al/Al* 732 873
Al/Cu* 790 941
Cu/Cu* 822 982
Electric Heat 29 29
Economizer 50 50
Roof Curb† 90 90
COMPRESSOR Semi-Hermetic
Type (Number) 06D-328 (1) 06D-818 (2)
Cylinders 64
Oil Charge (L) 3.40 2.60
REFRIGERANT TYPE R-22
Charge (kg)
System 1 10.2 7.0
System 2 — 7.0
OUTDOOR COIL 10 mm, Internally-Grooved Copper Tubes, Aluminum
or Copper Plate Fins
Rows 33
Fins/m 590 590
Total Face Area (m
2
)2.02 2.02
OUTDOOR FAN Propeller Type, Direct Drive
Nominal L/s 4250 4250
Number...Diameter (mm) 3...559 3...559
Motor kW (17.9 R/s) 0.375 0.375
Watts Input (Total) 1090 1090
INDOOR COIL 10 mm, Internally-Grooved Copper Tubes, Aluminum
or Copper Plate Fins, Face Split
Expansion Device Fixed Orifice
Rows 33
Fins/m 590 590
Total Face Area (m
2
)1.63 1.63
INDOOR FAN Centrifugal, Adjustable Pitch Belt Drive
Quantity...Size (mm) 2...254 x 254 2...305 x 305
Nominal L/s 2360 2832
Fan R/s Range 17.0-21.0 14.7-17.7
Maximum Allowable R/s 25.8 25.8
Motor Pulley Pitch Diameter (mm) 109/135 124/150
Fan Pulley Pitch Diameter (mm) 152 200
Belt, Quantity...Type...Length (mm) 1...B...1143 1...BX...1270
Pulley Center Line Distance (mm) 343-394 338-376
Factory Speed Setting (R/s) 18.6 15.9
Motor kW (Service Factor) 2.78 (1.15) 3.75 (1.15)
Motor Frame Size 56H 184T
Motor Efficiency 0.81 0.85
HIGH-PRESSURE SWITCH
Cutout (kPa) 2939
Reset (kPa) 2208
LOW-PRESSURE/LOSS-OF-CHARGE SWITCH
Cutout (kPa) 48
Reset (kPa) 152
AIR INLET SCREENS Cleanable
Quantity...Size (mm) 2...508 x 635 x 25
1...508 x 508 x 25
RETURN-AIR FILTERS (TYPE) 10% Efficient — 51 mm (2-in.) Throwaway Fiberglass
Quantity...Size (mm) 4...508 x 508
4...406 x 508
LEGEND
Al — Aluminum
Cu — Copper
*Indoor coil fin material/outdoor coil fin material.
†Weight of 355 mm roof curb.
4

Table 1B — Physical Data, English
UNIT SIZE 50HJQ 014 016
OPERATING WT (lb)
Al/Al* 1615 1925
Al/Cu* 1745 2075
Cu/Cu* 1815 2165
Electric Heat 65 65
Economizer 110 110
Roof Curb† 200 200
COMPRESSOR Semi-Hermetic
Type (Number) 06D-328 (1) 06D-818 (2)
Cylinders 64
Oil Charge (oz) 115 88
REFRIGERANT TYPE R-22
Charge (lb)
System 1 22.5 15.5
System 2 — 15.5
OUTDOOR COIL
3
⁄ 8 in., Internally-Grooved Copper Tubes, Aluminum
or Copper Plate Fins
Rows 33
Fins/m 15 15
Total Face Area (sq ft) 21.7 21.7
OUTDOOR FAN Propeller Type, Direct Drive
Nominal Cfm 9000 9000
Number...Diameter (in.) 3...22 3...22
Motor Hp (1075 Rpm)
1
⁄ 21 ⁄ 2
Watts Input (Total) 1090 1090
INDOOR COIL
3
⁄ 8 in., Internally-Grooved Copper Tubes, Aluminum
or Copper Plate Fins, Face Split
Expansion Device Fixed Orifice
Rows 33
Fins/m 15 15
Total Face Area (sq ft) 17.5 17.5
INDOOR FAN Centrifugal, Adjustable Pitch Belt Drive
Quantity...Size (in.) 2...10 x 10 2...12 x 12
Nominal Cfm 5000 6000
Fan Rpm Range 1021-1259 884-1064
Maximum Allowable Rpm 1550 1550
Motor Pulley Pitch Diameter (in.) 4.3/5.3 4.9/5.9
Fan Pulley Pitch Diameter (in.) 6.0 7.9
Belt, Quantity...Type...Length (in.) 1...B...45 1...BX...50
Pulley Center Line Distance (in.) 13.5-15.5 13.3-14.8
Factory Speed Setting (Rpm) 1116 956
Motor Hp (Service Factor) 3.7 (1.15) 5 (1.15)
Motor Frame Size 56H 184T
Motor Efficiency 0.81 0.85
HIGH-PRESSURE SWITCH
Cutout (psig) 426
Reset (psig) 320
LOW-PRESSURE/LOSS-OF-CHARGE SWITCH
Cutout (psig) 7
Reset (psig) 22
AIR INLET SCREENS Cleanable
Quantity...Size (in.) 2...20 x 25 x 1
1...20 x 20 x 1
RETURN-AIR FILTERS (TYPE) 10% Efficient — 2-in. Throwaway Fiberglass
Quantity...Size (in.) 4...20 x 20
4...16 x 20
LEGEND
Al — Aluminum
Cu — Copper
*Indoor coil fin material/outdoor coil fin material.
†Weight of 14 in. roof curb.
5

UNIT
50HJQ MAXIMUM SHIPPING WEIGHT*
Lb Kg
014 2092 948
016 2402 1089
*Units with aluminum indoor and outdoor coil fins.
LEGEND
KO—Knockout
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Center of gravity.
3. Direction of airflow.
4. Ductwork to be attached to accessory roof curb or adapter only.
5. Minimum clearance:
a. Rear: 78-09(2134) for coil removal. This dimension can be re-
duced to 48-09(1219) if conditions permit coil removal from the
top.
b. Left side: 48-09(1219) for proper outdoor coil airflow.
c. Front: 48-09(1219) for control box access.
d. Rightside: 48-09(1219)for properoperationof damperand power
exhaust (if so equipped).
e. Top: 68-09(1829) to assure proper outdoor fan operation.
f. Local codes or jurisdiction may prevail.
6. With the exception of clearance for the outdoor coil and the damper
and power exhaust as stated in note no. 5, a removable fence or
barricade requires no clearance.
7. Dimensionsare fromoutside ofcorner post.Allow08-
5
⁄ 16 9(8)on each
side for top panel drip edge.
UNIT
50HJQ
WEIGHT OF CORNER*
ABCD
Lb Kg Lb Kg Lb Kg Lb Kg
014 366 166 356 161 360 163 534 242
016 464 211 496 225 477 217 487 221
*Weights are for unit only (aluminum indoor and outdoor coil fin
material) and do not include options or crating.
Fig. 4 — Base Unit Dimensions
UNIT
50HJQ
DIMENSIONS
XY
ft-in. mm ft-in. mm
014 3-1 947 3-2 965
016 3-6 1059 3-8 1105
6

NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 5 — Air Distribution — Through-the-Bottom
(50HJQ016 Shown)
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 6 — Concentric Duct Air Distribution
(50HJQ016 Shown)
Shaded area indicates block-off panels.
NOTES:
1. Dimensions A, A8and B, B8are obtained from field-supplied ceil-
ing diffuser.
2. Dimensions are in millimeters.
Fig. 7 — Concentric Duct Details
3/4" FPT DRAIN
CONNECTION 35 (1-3/8") DRAIN HOLE
NOTE: Dimension is in millimeters.
Fig. 8 — Condensate Drain Details
Fig. 9 — Condensate Drain Piping Details
LEGEND
EQUIP GND — Equipment Ground
kcmil — Thousand Circular Mils
NEC — National Electrical Code (U.S.A. Standard)
TB — Terminal Block
NOTE: The maximum wire size forTB1 is 185 mm
2
(350 kcmil) for all
unit voltages.
Fig. 10 — Field Power Wiring Connections
7

Table 2 — Electrical Data
UNIT
50HJQ VOLTAGE
VOLTAGE
RANGE COMPRESSOR OUTDOOR
FAN
MOTOR INDOOR FAN
MOTOR POWER EXHAUST OPTIONAL ELECTRIC HEAT POWER SUPPLY DISCONNECT SIZING
No. 1 No. 2
Min Max RLA LRA RLA LRA Qty FLA
(ea) LRA Hp FLA LRA FLA LRA FLA kW MCA MOCP* RLA LRA
014 400-3-50 342 440 19.9 114 — — 3 0.8 10.8 3.7 4.8 42.3
—— — — 32 50 31.2 189 34 23 75 80 44.6 189
57 40 103 110 71.1 189
2.3 6 — — 34 50 33.8 195 34 23 77 80 47.3 195
57 40 106 110 73.7 195
016 400-3-50 342 440 14.1 80 14.1 80 3 0.8 10.8 5 7.9 46
—— — — 42 50 44 238 34 23 85 90 48 238
57 40 113 125 75 238
2.3 6 — — 44 50 47 238 34 23 87 90 51 238
57 40 116 125 77 238
LEGEND
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code (U.S.A. Standard)
RLA — Rated Load Amps
*Fuse or HACR circuit breaker. This is the maximum size permissible; smaller
fuse size may be used where conditions permit.
NOTE: In compliance with NEC requirements for multimotor and combination
load equipment (refer to NECArticles 430 and 440), the overcurrent protective
device for the unit shall be fuse or HACR breaker.
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to the installation
instructions included with the accessory. Refer to unit Price
Pages or contact your local representative for more infor-
mation. Locate thermostat assembly on a solid wall in the
conditioned space to sense average temperature.
Route thermostat cable or equivalent single leads of
1.0 mm
2
(no. 18 AWG [American Wire Gage]) colored wire
from subbase terminals through conduit in unit to low-
voltage connections as shown on unit label wiring diagram
and in Fig. 11.
NOTE: For wire runs up to 15 m (50 ft), use 1.0 mm
2
(no. 18 AWG) insulated wire (35 C minimum). For 15 m to
22 m (50 to 75 ft), use 1.5 mm
2
(no. 16AWG) insulated wire
(35 C minimum). For over 22 m (75 ft), use 2.5 mm
2
(no.
14 AWG) insulated wire (35 C minimum). All wire larger
than 1.0 mm
2
(no. 18 AWG) cannot be directly connected to
the thermostat and will require a junction box and splice at
the thermostat. See Table 3 for American/European wire
conversions.
Set heat anticipator settings as indicated in Table 4. Set-
tings may be changed slightly to provide a greater degree of
comfort for a particular installation.
Refer to accessory remote control instructions as
required.
Step 7 — Make Outdoor-Air Inlet Adjustments
MANUAL OUTDOOR-AIR DAMPER —All units (except
those equipped with a factory-installed economizer) have a
manual outdoor-air damper to provide ventilation air. Damper
can be preset to admit up to 25% outdoor air into return-air
compartment. To adjust, loosen securing screws and move
damper to desired setting. Then retighten screws to secure
damper (Fig. 12).
OPTIONAL FACTORY-INSTALLED ECONOMIZER
Economizer Motor Control Module (Fig. 13-15) — Set to
the ‘‘D’’ setting (Fig. 14). The control module is located on
the economizer motor. See Fig. 13 and 15.
Damper Vent Position Setting
1. Set fan switch at ON position (continuous fan operation),
and close night switch if used.
2. Set system selector switch to OFF position.
3. Turn adjustment screw slowly until dampers assume de-
sired vent position. Do not manually operate economizer
motor since damage to motor will result.
NOTE: Refer to accessory installation instructions included
with the field-installed economizer for installation informa-
tion. Also see Economizer Adjustment section on page 19.
Table 3 — American/European Wire Conversions
AMERICAN EUROPEAN
Industry
Standard
Size
American
Conversion Size
(mm
2
)
Industry
Standard
Size (mm
2
)
18 AWG 0.82 1.0
16 AWG 1.30 1.5
14 AWG 2.08 2.5
12 AWG 3.30 4.0
10 AWG 5.25 6.0
8 AWG 6.36 10.0
6 AWG 13.29 16.0
4 AWG 21.14 25.0
3 AWG 26.65 —
2 AWG 33.61 35.0
1 AWG 42.39 50.0
1/0 AWG 53.49 —
2/0 AWG 67.42 70.0
3/0 AWG 85.00 95.0
4/0 AWG 107.19 120.0
250 kcmil 126.64 150.0
300 kcmil 151.97 —
350 kcmil 177.90 185.0
400 kcmil 202.63 240.0
500 kcmil 253.29 300.0
600 kcmil 303.95 —
LEGEND
AWG — American Wire Gage
kcmil — Thousand Circular Mils
Table 4 — Heat Anticipator Settings
UNIT
VOLTAGE HEATER kW STAGE 1 STAGE 2
400 23 .40 .40
40 .40 .66
LOW-VOLTAGE CONNECTIONS
Fig. 11 — Field Control Thermostat Wiring
8

Step 8 — Install Outdoor-Air Hood — The same
type of factory-installed hood is used on units with 25% air
ventilation and units with an economizer.
NOTE: The hood top panel, upper and lower filter retain-
ers, hood drain pan, and filter support bracket are secured
opposite the outdoor air end of the unit. The screens, hood
side panels, remaining section of filter support bracket, seal
strip, and all other hardware are in a package located inside
the return-air filter access panel (Fig. 16).
1. Attach seal strip to upper filter retainer. See Fig. 17.
2. Assemble hood top panel and side panels, upper filter re-
tainer, and hood drain pan (Fig. 18).
3. Secure lower filter retainer and long piece of filter sup-
port bracket to unit. See Fig. 18. Tighten screws.
4. Loosen sheet metal screws for base unit top panel located
above outdoor-air inlet opening, and remove screws for
hood side panels located on the sides of the outdoor-air
inlet opening.
5. Match notches in hood top panel to unit top panel screws.
Insert hood flange between unit top panel flange and unit.
Tighten screws.
6. Hold hood side panel flanges flat against unit, and install
screws removed in Step 4.
7. Insert outdoor-air inlet screens and spacer in channel cre-
ated by lower filter retainer and filter support bracket.
8. Attach remaining shorter section section of filter support
bracket.
Fig. 12 — 25% Outdoor-Air Section Details
OUTDOOR
AIR
THERMOSTAT
Fig. 13 — Economizer Damper Assembly —
End View
LED — Light-Emitting Diode
Fig. 14 — Economizer Control Module
Fig. 15 — Economizer Control Module Location
Fig. 16 — Outdoor-Air Hood Component Location
9

START-UP
Use the following information and complete Start-Up
Checklist on page CL-1 to check out unit PRIOR to start-up.
Unit Preparation — Check that unit has been installed
in accordance with these installation instructions and all
applicable codes.
Compressor Mounting — Loosen compressor hold-
down bolts until sideways movement of the washer
under each holddown bolt head can be obtained. Do not loosen
completely, as bolts are self-locking and will maintain
adjustment.
Internal Wiring — Check all electrical connections in
unit control boxes; tighten as required.
Refrigerant Service Ports and Valves — Each
50HJQ unit has 2 Schrader-type service ports per circuit; one
on the suction line and one on the liquid line. Be sure that
the caps on the ports are tight. The units also have 2 service
valves per circuit; one on the suction line and one on the
discharge line. Be sure all valves are open.
Crankcase Heaters — Heaters are energized as long
as there is power to unit.
IMPORTANT: Unit power must be on for 24 hours
prior to start-up. Otherwise, damage to compressor may
result.
Indoor Fan — Fan belt and pulleys are factory in-
stalled. See Table 5 for Air Quantity Limits. See Tables 6-9
for Fan Performance data. Be sure that fans rotate in the proper
direction. See Tables 10A and 10B for static pressure drops
for accessories and options. See Fig. 19 and 20 for fan per-
formance using horizontal adapter and power exhaust. To
alter fan performance, see Indoor Fan sections, pages 17
and 18.
Table 5 — Air Quantity Limits
UNIT
50HJQ MINIMUM MAXIMUM
L/s Cfm L/s Cfm
014 1770 3750 2950 6250
016 2125* 4500* 3540 7500
*Minimum airflow is 2644 L/s (5600 cfm) when electric heat is used.
NOTE: The 50DP900211 high-static regain adapter accessory may
be used to provide horizontal supply/return. NOTE: The 50DP900211 horizontal supply and return adapter ac-
cessoryimproves50HJQ fan performancebyincreasing external static
pressure by amount shown above.
Fig. 19 — Horizontal Supply/Return Fan Performance With 50DP900211 High-Static Regain Adapter
Fig. 17 − Seal Strip Location
(Air Hood Cross-Sectional View)
HOOD TOP
PANEL
HOOD SIDE
PANELS (2)
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
NOTE: The outdoor-air hood kit contains a baffle which is not used
on the 50HJQ units. Discard the baffle.
Fig. 18 — Outdoor-Air Hood Details
10

Table 6 — Fan Performance, 50HJQ014 (SI)
AIRFLOW
(L/s)
EXTERNAL STATIC PRESSURE (Pa)
50 100 150 200 250
R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW
1771 12.1 0.48 0.39 14.0 0.69 0.56 15.6 0.89 0.72 17.1 1.10 0.89 18.5 1.31 1.06
1889 12.6 0.61 0.50 14.4 0.82 0.67 16.0 1.03 0.84 17.5 1.25 1.01 18.9 1.46 1.18
2007 13.1 0.76 0.61 14.9 0.97 0.79 16.5 1.19 0.96 17.9 1.41 1.14 19.2 1.63 1.32
2125 13.6 0.91 0.74 15.4 1.14 0.92 16.9 1.36 1.10 18.3 1.58 1.28 19.6 1.81 1.46
2243 14.2 1.08 0.88 15.8 1.31 1.06 17.3 1.54 1.25 18.7 1.77 1.43 20.0 2.00 1.62
2361 14.7 1.27 1.03 16.3 1.50 1.22 17.8 1.74 1.41 19.1 1.97 1.60 20.4 2.20 1.79
2479 15.3 1.46 1.19 16.8 1.70 1.38 18.3 1.94 1.57 19.6 2.18 1.77 20.8 2.42 1.96
2597 15.8 1.67 1.36 17.4 1.92 1.55 18.7 2.16 1.75 20.0 2.41 1.95 21.2 2.65 2.15
2715 16.4 1.90 1.54 17.9 2.15 1.74 19.2 2.40 1.94 20.5 2.65 2.15 21.6 2.90 2.35
2833 17.0 2.14 1.74 18.4 2.39 1.94 19.7 2.65 2.15 20.9 2.91 2.35 22.1 3.16 2.56
2951 17.6 2.40 1.94 18.9 2.65 2.15 20.2 2.91 2.36 21.4 3.17 2.57 22.5 3.44 2.78
AIRFLOW
(L/s)
EXTERNAL STATIC PRESSURE (Pa)
300 350 400 450 500
R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW
1771 19.8 1.53 1.24 21.1 1.75 1.41 22.3 1.97 1.60 23.4 2.20 1.78 24.5 2.43 1.97
1889 20.1 1.68 1.36 21.4 1.91 1.55 22.5 2.14 1.73 23.6 2.37 1.92 24.7 2.60 2.11
2007 20.5 1.85 1.50 21.6 2.08 1.69 22.8 2.31 1.87 23.9 2.55 2.06 24.9 2.79 2.26
2125 20.8 2.04 1.65 22.0 2.27 1.84 23.1 2.50 2.03 24.1 2.74 2.22 25.2 2.98 2.42
2243 21.1 2.23 1.81 22.3 2.47 2.00 23.4 2.71 2.19 24.4 2.95 2.39 25.4 3.19 2.59
2361 21.5 2.44 1.98 22.6 2.68 2.17 23.7 2.92 2.37 24.7 3.17 2.57 25.7 3.42 2.77
2479 21.9 2.66 2.16 23.0 2.91 2.36 24.0 3.15 2.55 25.1 3.40 2.76 ———
2597 22.3 2.90 2.35 23.4 3.15 2.55 24.4 3.40 2.75 25.4 3.65 2.96 ———
2715 22.7 3.15 2.55 23.8 3.40 2.76 24.8 3.66 2.96 25.7 3.91 3.17 — — —
2833 23.1 3.42 2.77 24.2 3.67 2.97 25.2 3.93 3.18 — — — — — —
2951 23.6 3.70 2.99 24.6 3.96 3.20 25.6 4.22 3.42 — — — — — —
LEGEND
BkW — Fan Input kW × Motor Efficiency
FIOP — Factory-Installed Option
kW — Kilowatt Input to Motor
NOTES:
1. Boldface indicates field-supplied drive required.
2. indicates field supplied motor and drive required.
3. All other numbers indicate standard operation.
4. Factory-shipped motor drive range is 17.0 to 21.0 r/s. Other r/s’s
may require a field-supplied drive.
5. Maximum continuous BkW is 3.06 and maximum continuous kW
is 3.78.
6. Static pressure losses (i.e., economizer) must be added to exter-
nal static pressure before entering Fan Performance table.
7. Interpolation is permissible. Do not extrapolate.
8. Fan performance is based on wet coils, clean filters, and casing
losses. See Table 10A for accessory/FIOP static pressure
information.
9. Extensive motor and drive testing on these units ensures that the
full BkW range of the motor can be utilized with confidence. Using
your fan motors up to the watts rating shown will not result in nui-
sance tripping or premature motor failure. Unit warranty will not be
affected.
11

Table 7 — Fan Performance, 50HJQ016 (SI)
AIRFLOW
(L/s)
EXTERNAL STATIC PRESSURE (Pa)
50 100 150 200 250
R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW
2124 9.73 0.72 0.58 11.59 0.95 0.77 13.30 1.20 0.98 14.89 1.48 1.20 16.40 1.79 1.45
2266 10.15 0.84 0.68 11.94 1.08 0.88 13.59 1.35 1.09 15.12 1.63 1.32 16.57 1.94 1.57
2407 10.57 0.97 0.79 12.30 1.23 1.00 13.88 1.50 1.22 15.36 1.79 1.45 16.76 2.10 1.70
2549 10.99 1.12 0.91 12.66 1.39 1.12 14.20 1.67 1.35 15.62 1.97 1.59 16.98 2.29 1.85
2690 11.45 1.28 1.04 13.06 1.57 1.27 14.55 1.86 1.51 15.93 2.17 1.75 17.24 2.49 2.02
2832 11.86 1.46 1.18 13.42 1.75 1.42 14.87 2.06 1.66 16.21 2.37 1.92 17.48 2.70 2.19
2974 12.26 1.64 1.33 13.77 1.95 1.58 15.19 2.27 1.83 16.50 2.59 2.10 17.73 2.93 2.37
3115 12.72 1.86 1.50 14.18 2.18 1.76 15.56 2.50 2.03 16.83 2.84 2.30 18.03 3.19 2.58
3257 13.13 2.08 1.68 14.55 2.41 1.95 15.90 2.75 2.23 17.14 3.09 2.51 18.32 3.45 2.79
3398 13.56 2.32 1.88 14.93 2.66 2.16 16.25 3.01 2.44 17.46 3.37 2.73 18.61 3.73 3.02
3540 14.02 2.58 2.09 15.36 2.94 2.38 16.64 3.30 2.68 17.83 3.67 2.97 18.95 4.05 3.28
AIRFLOW
(L/s)
EXTERNAL STATIC PRESSURE (Pa)
300 350 400 450 500
R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW R/s kW BkW
2124 17.83 2.11 1.71 19.19 2.46 1.99 20.48 2.82 2.28 21.70 3.19 2.59 22.85 3.58 2.90
2266 17.96 2.27 1.84 19.28 2.62 2.12 20.55 2.99 2.42 21.76 3.37 2.73 22.92 3.77 3.05
2407 18.10 2.44 1.98 19.40 2.80 2.26 20.64 3.17 2.57 21.83 3.56 2.88 22.97 3.97 3.21
2549 18.28 2.63 2.13 19.53 2.99 2.42 20.74 3.37 2.73 21.91 3.76 3.05 23.04 4.17 3.38
2690 18.49 2.83 2.30 19.71 3.20 2.59 20.89 3.58 2.90 22.03 3.99 3.23 23.14 4.40 3.57
2832 18.70 3.05 2.47 19.88 3.42 2.77 21.03 3.81 3.09 22.14 4.22 3.41 23.22 4.64 3.76
2974 18.92 3.29 2.66 20.07 3.66 2.96 21.18 4.05 3.28 22.27 4.46 3.61 23.32 4.89 3.96
3115 19.19 3.55 2.87 20.30 3.93 3.18 21.39 4.32 3.50 22.44 4.74 3.84 23.48 5.17 4.19
3257 19.44 3.82 3.10 20.53 4.21 3.41 21.59 4.61 3.73 22.61 5.03 4.07 23.62 5.46 4.42
3398 19.71 4.11 3.33 20.77 4.51 3.65 21.80 4.91 3.98 22.81 5.33 4.32 23.79 5.77 4.68
3540 20.03 4.44 3.59 21.06 4.84 3.92 22.07 5.25 4.25 23.05 5.68 4.60 24.01 6.12 4.96
LEGEND
BkW — Fan Input kW × Motor Efficiency
FIOP — Factory-Installed Option
kW — Kilowatt Input to Motor
NOTES:
1. Boldface indicates field-supplied drive required.
2. indicates field-supplied motor and drive required.
3. All other numbers indicate standard operation.
4. Factory-shipped motor drive range is 14.7 to 17.7 r/s. Other r/s’s
may require a field-supplied drive.
5. Maximum continuous BkW is 4.2 and maximum continuous kW is
5.18.
6. Static pressure losses (i.e., economizer) must be added to exter-
nal static pressure before entering Fan Performance table.
7. Interpolation is permissible. Do not extrapolate.
8. Fan performance is based on wet coils, clean filters, and casing
losses. See Table 10A for accessory/FIOP static pressure
information.
9. Extensive motor and drive testing on these units ensures that the
full BkW range of the motor can be utilized with confidence. Using
your fan motors up to the watts rating shown will not result in nui-
sance tripping or premature motor failure. Unit warranty will not be
affected.
12

Table 8 — Fan Performance, 50HJQ014 (English)
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8 1.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
3750 724 481 0.55 838 685 0.78 937 889 1.01 1028 1097 1.25 1111 1309 1.49
4000 754 613 0.70 865 824 0.94 962 1034 1.18 1050 1247 1.42 1131 1463 1.67
4250 786 757 0.86 893 975 1.11 987 1191 1.36 1073 1408 1.60 1152 1629 1.86
4500 818 914 1.04 922 1138 1.30 1013 1360 1.55 1097 1583 1.80 1174 1808 2.06
4750 850 1084 1.23 951 1313 1.50 1040 1541 1.76 1122 1770 2.02 1197 2000 2.28
5000 883 1267 1.44 980 1501 1.71 1068 1736 1.98 1147 1969 2.24 1221 2204 2.51
5250 917 1464 1.67 1011 1703 1.94 1096 1943 2.21 1174 2183 2.49 1246 2423 2.76
5500 950 1675 1.91 1041 1918 2.19 1124 2165 2.47 1201 2409 2.75 1272 2655 3.02
5750 985 1901 2.17 1072 2147 2.45 1153 2400 2.73 1228 2650 3.02 1298 2901 3.31
6000 1020 2142 2.44 1103 2391 2.72 1183 2649 3.02 1256 2905 3.31 1324 3160 3.60
6250 1055 2398 2.73 1135 2650 3.02 1213 2912 3.32 1284 3175 3.62 1352 3435 3.91
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
1.2 1.4 1.6 1.8 2.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
3750 1190 1526 1.74 1265 1746 1.99 1337 1972 2.25 1405 2199 2.51 1471 2431 2.77
4000 1208 1684 1.92 1281 1908 2.17 1351 2136 2.43 1418 2368 2.70 1483 2603 2.97
4250 1227 1853 2.11 1299 2082 2.37 1367 2313 2.64 1433 2548 2.90 1496 2787 3.18
4500 1247 2036 2.32 1317 2268 2.58 1384 2503 2.85 1448 2742 3.12 1510 2983 3.40
4750 1269 2232 2.54 1337 2468 2.81 1403 2707 3.08 1465 2948 3.36 1526 3194 3.64
5000 1291 2441 2.78 1358 2680 3.05 1422 2923 3.33 1484 3168 3.61 1544 3418 3.89
5250 1315 2664 3.03 1380 2907 3.31 1443 3154 3.59 1503 3403 3.88 ———
5500 1339 2900 3.30 1403 3148 3.59 1464 3398 3.87 1524 3651 4.16 ———
5750 1364 3151 3.59 1426 3403 3.88 1486 3657 4.17 1545 3914 4.46 — — —
6000 1389 3416 3.89 1450 3672 4.18 1510 3930 4.48 — — — — — —
6250 1415 3695 4.21 1476 3957 4.51 1534 4219 4.81 — — — — — —
LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates field-supplied drive required.
2. indicates field supplied motor and drive required.
3. All other numbers indicate standard operation.
4. Factory-shippedmotordriverange is 1021to1259rpm. Other rpms
may require a field-supplied drive.
5. Maximum continuous bhp is 4.25 and maximum continuous watts
is 3775.
6. Static pressure losses (i.e., economizer) must be added to exter-
nal static pressure before entering Fan Performance table.
7. Interpolation is permissible. Do not extrapolate.
8. Fan performance is based on wet coils, clean filters, and casing
losses. See Table 10B for accessory/FIOP static pressure
information.
9. Extensive motor and drive testing on these units ensures that the
full bhp range of the motor can be utilized with confidence. Using
your fan motors up to the bhp rating shown will not result in nui-
sance tripping or premature motor failure. Unit warranty will not be
affected.
13

Table 9 — Fan Performance, 50HJQ016 (English)
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8 1.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
4500 584 717 0.8 695 952 1.1 798 1205 1.3 893 1483 1.7 984 1786 2.0
4800 609 839 0.9 717 1085 1.2 815 1346 1.5 907 1630 1.8 994 1938 2.2
5100 634 971 1.1 738 1229 1.4 833 1500 1.7 921 1791 2.0 1006 2104 2.4
5400 660 1118 1.3 760 1389 1.6 852 1669 1.9 937 1968 2.2 1019 2286 2.6
5700 687 1284 1.4 783 1566 1.8 873 1858 2.1 956 2165 2.4 1034 2490 2.8
6000 712 1458 1.6 805 1752 2.0 892 2055 2.3 973 2371 2.7 1049 2703 3.0
6300 736 1644 1.8 826 1952 2.2 911 2265 2.5 990 2591 2.9 1064 2930 3.3
6600 763 1856 2.1 851 2176 2.4 933 2502 2.8 1010 2837 3.2 1082 3186 3.6
6900 788 2078 2.3 873 2410 2.7 954 2747 3.1 1029 3093 3.5 1099 3451 3.9
7200 813 2316 2.6 896 2662 3.0 975 3011 3.4 1048 3367 3.8 1117 3734 4.2
7500 841 2584 2.9 921 2943 3.3 998 3304 3.7 1070 3672 4.1 1137 4049 4.5
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
1.2 1.4 1.6 1.8 2.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
4500 1070 2113 2.4 1151 2458 2.8 1229 2819 3.2 1302 3194 3.6 1371 3578 4.0
4800 1078 2269 2.5 1157 2620 2.9 1233 2990 3.3 1306 3374 3.8 1375 3769 4.2
5100 1086 2439 2.7 1164 2795 3.1 1238 3170 3.5 1310 3560 4.0 1378 3965 4.4
5400 1097 2626 2.9 1172 2986 3.3 1245 3366 3.8 1315 3763 4.2 1382 4174 4.7
5700 1110 2835 3.2 1183 3200 3.6 1253 3584 4.0 1322 3986 4.5 1388 4404 4.9
6000 1122 3053 3.4 1193 3422 3.8 1262 3810 4.3 1329 4216 4.7 1393 4638 5.2
6300 1135 3286 3.7 1204 3660 4.1 1271 4052 4.5 1336 4461 5.0 1399 4887 5.5
6600 1151 3549 4.0 1218 3928 4.4 1283 4325 4.8 1347 4739 5.3 1409 5169 5.8
6900 1167 3821 4.3 1232 4207 4.7 1295 4608 5.2 1357 5026 5.6 1417 5460 6.1
7200 1183 4113 4.6 1246 4505 5.0 1308 4912 5.5 1368 5335 6.0 1427 5773 6.5
7500 1202 4437 5.0 1264 4837 5.4 1324 5251 5.9 1383 5679 6.4 1440 6122 6.9
LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates field-supplied drive required.
2. indicates field-supplied motor and drive required.
3. All other numbers indicate standard operating range.
4. Factory-shipped motor drive range is 884 to 1064 rpm. Other rpms
may require a field-supplied drive.
5. Maximum continuous bhp is 5.90 and maximum continuous watts
are 5180. Do not adjust motor rpm such that motor maximum bhp
and/or watts is exceeded at the maximum operating cfm.
6. Static pressure losses (i.e., economizer) must be added to exter-
nal static pressure before entering Fan Performance table.
7. Interpolation is permissible. Do not extrapolate.
8. Fan performance is based on wet coils, clean filters, and casing
losses. See Table 10B for accessory/FIOP static pressure
information.
9. Extensive motor and drive testing on these units ensures that the
full horsepower and watts range of the motor can be utilized with
confidence. Using your fan motors up to the bhp rating shown will
not result in nuisance tripping or premature motor failure. Unit war-
ranty will not be affected.
14

Table 10A — Accessory/FIOP Static Pressure (Pa)
ACCESSORY/FIOP kW L/s
1770 2125 2395 2832 2949 3398 3540
Electric Heaters 23
40 12 15 15 17 17 20 22 30 22 32 27 37 30 42
Economizer — 7 10 12 17 17 22 25
Glycol Coil —3855658792109114
LEGEND
FIOP — Factory-Installed Option NOTES:
1. Heaters are rated at 400 v.
2. The static pressure must be added to external static pressure. The
sumandtheindoor-airsection entering-air L/s should thenbeused
in conjunction with Tables 6 and 7 to determine blower R/s, kW,
and BkW.
Table 10B — Accessory/FIOP Static Pressure (in. wg)
ACCESSORY/FIOP kW CFM
3750 4500 5000 6000 6250 7200 7500
Electric Heaters 23
40 0.05 0.06 0.06 0.07 0.07 0.08 0.09 0.12 0.09 0.13 0.11 0.15 0.12 0.17
Economizer — 0.03 0.04 0.05 0.07 0.07 0.09 0.10
Glycol Coil — 0.16 0.22 0.26 0.35 0.37 0.44 0.46
LEGEND
FIOP — Factory-Installed Option NOTES:
1. Heaters are rated at 400 v.
2. The static pressure must be added to external static pressure. The
sumandtheindoor-air section entering-aircfmshouldthen be used
inconjunctionwithTables8and9 to determine blower Rpm,Watts,
and Bhp.
Outdoor Fans and Motors — Fans and motors are
factory set. Refer to Outdoor-Fan Adjustment section on
page 18 as required.
Return-Air Filters — Check that correct filters are
installed in filter tracks. See Tables 1A and 1B. Do not op-
erate unit without return-air filters.
Outdoor-AirInletScreens — Outdoor-air inlet screens
must be in place before operating unit.
Accessory Field-Installed Economizer Adjust-
ment — Remove filter access panel. Check that outdoor-
air damper is closed and return-air damper is open.
Economizer operation and adjustment is described in
Base Unit Operation and Economizer Adjustment sections
on this page and page 19, respectively.
Base Unit Operation
COOLING, UNITS WITHOUT ECONOMIZER — With unit
main power on, set thermostat to COOL position and de-
sired room temperature. Set fan switch at AUTO. (on de-
mand) or ON (continuous) position.
On a rise in room temperature, cooling contact no. 1 in
the thermostat closes. The indoor and outdoor fan motors
start. If the 5-minute compressor time-delay (CTD) on the
defrost board (DB) is satisfied, then compressor no. 1
(size 016) or unloaded compressor (size 014) contactor is
energized and compressor will start. Compressor cycles on
demand of the thermostat to satisfy room conditions. Each
time the cooling contactor no. 1 opens, the CTD starts the
5-minute delay.
On 50HJQ016 units with an additional rise in room tem-
perature, cooling contactor no. 2 in the thermostat closes,
energizing compressor contactor no. 2. Compressor no. 2 starts
and cycles on demand of the thermostat to satisfy the oc-
cupied space demands.
On 50HJQ014 units, the compressor runs fully loaded on
a call for second stage cooling.
COOLING, UNITS WITH ECONOMIZER — Upon a call
for cooling, when outdoor ambient temperature is above the
temperature control setting, the indoor and outdoor fans and
compressor(s) energize. The economizer damper moves to
vent position.
Upon a first-stage call for cooling, when outdoor ambient
temperature is below the temperature control setting, the in-
door fan starts and economizer damper modulates to main-
tain mixed-air temperature. The compressors remain off.
Upon a second-stage call for cooling, compressor no. 1
(size 016) or loaded compressor (size 014) is energized and
mechanical cooling is integrated with economizer cooling.
Compressor no. 2 (size 016) is locked out. If the air tem-
perature is below 10 C (50 F), a cooling lockout switch pre-
vents the compressor(s) from running.
Fig. 20 — Fan Performance Using Accessory
Power Exhaust
15

When supply-air temperature drops below a fixed set point,
the economizer damper modulates to maintain the tempera-
ture at the fixed set point.
A freeze protection thermostat (FPT) is located on the in-
door coil. It detects frost build-up and turns off the com-
pressor(s), allowing the coil to clear. Once frost has melted,
the compressor can be reenergized.
HEATING, UNITS WITHOUT ECONOMIZER — With unit
main power on, set thermostat at HEAT position and desired
room temperature. Set fan switch at AUTO. (on demand) or
ON (continuous) position.
On a drop in room temperature, heating contact no. 1 in
the thermostat closes, energizing heat relay (HR), reversing
valve relay (RVR), reversing valve solenoids (RVS1 and RVS2)
and compressor no. 2 contactor. Compressor (size 014) or
compressor no. 2 (size 016) and indoor and outdoor fan mo-
tors start. If the 5-minute CTD on the DB is satisfied, then
compressor no. 1 contactor is energized and compressor
no. 1 will start.
On units equipped with electric heat, when additional heat
is needed, heating contactor no. 2 in the thermostat closes,
energizing W2.
HEATING, UNITSWITH ECONOMIZER — With unit main
power on, set thermostat at HEAT position and desired room
temperature. Set fan switch at AUTO. (on demand) or ON
(continuous) position.
On a drop in room temperature, heating contact no. 1 in
the thermostat closes, energizing heat relay (HR), reversing
valve relay (RVR), reversing valve solenoids (RVS1 and RVS2)
and compressor no. 2 contactor. Compressor no. 2 (size 016)
and indoor and outdoor fan motors start. If the 5-minute com-
pressor time delay (CTD) on the defrost board (DB) is sat-
isfied, then compressor (size 014) or compressor no. 1
(size 016) contactor is energized and compressor will start.
The outdoor-air damper stays at vent position while the in-
door fan is operating.
On units equipped with electric heat, when additional heat
is needed, heating contactor no. 2 in the thermostat closes,
energizing W2.
DEFROST CYCLE — When the temperature of the out-
door coil drops below −2 C (28 F) as sensed by the defrost
thermostat (DFT1 or DFT2), the defrost timer starts. At the
end of a timed period (field set at 30, 50, or 90 minutes), the
defrost cycle will begin. The defrost board energizes termi-
nals O and W2, energizes the defrost relay (DR), deener-
gizes the reversing valve solenoids (RVS1 and RVS2), and
energizes the electric heat. The outdoor-fan motors stop.
The unit continues to defrost either until the coil tempera-
ture as measured by DFT1 or DFT2 reaches 18 C (65 F), or
until unit completes a 10-minute defrost cycle. See Fig. 21
for DFT location.
During the defrost mode, when a circuit defrosts, RVS will
oscillate between heating and cooling modes until defrost
mode is complete. This will prevent the head pressure from
getting too high.
At the end of the defrost cycle, the electric heaters (if ap-
plicable) will be deenergized, the reversing valve solenoids
will be energized, and the outdoor fans will start.
AUTOMATIC CHANGEOVER — When the system selec-
tion switch is set atAUTO. position, unit automatically changes
from heating operation to cooling operation when the tem-
perature of the conditioned space rises to the cooling lever
setting. When the temperature of the conditioned space falls
to the heating lever setting, unit automatically changes from
cooling to heating operation (with a 1.7 C [3 F] deadband in
between).
CONTINUOUS AIR CIRCULATION — Turn unit power
on. Set system control at OFF position. Set fan switch at ON
position. The indoor-fan contactor is energized through the
thermostat switch and the indoor fan runs continuously.
CYCLE-LOC™ PROTECTION — If unit operation is in-
terrupted by an open high-pressure switch, low-pressure switch,
indoor coil freezestat, or by compressor internal line-break
device (overcurrent or overtemperature), and compressor is
calling for either cooling or heating, Cycle-LOC protection
device simultaneously locks out unit and lights a warning
light on the thermostat. Restart the unit by manually turning
thermostat to OFF and then to ON position. If any of the
protective devices opens again, the unit continues to lock
out until corrective action is taken.
NOTE: If the unit fails to operate due to compressor over-
current condition, restart by manually resetting circuit break-
ers at the unit. Restart cannot be accomplished at the room
thermostat.
EMERGENCY HEAT — If compressor is inoperative due
to a tripped safety device (high or low pressure, indoor coil
freezestat, overcurrent, or overtemperature), the Cycle-LOC
device locks out the compressor and lights a warning light
on the room thermostat. When the switch is on (thermostat
is set to the EM HT position), compressor circuit and out-
door thermostats are bypassed, and the second stage of ther-
mostat energizes the indoor blower and the electric resistance
heaters.
SERVICE
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Turn off ac-
cessory heater power switch if applicable. Electrical shock
could cause personal injury.
Cleaning — Inspect unit interior at beginning of each
heating and cooling season and as operating conditions re-
quire. Remove unit top panel and/or side panels for access
to unit interior.
INDOOR COIL— Clean as required with a commercial coil
cleaner.
OUTDOOR COIL — Clean outdoor coil annually and as
required by location and outdoor-air conditions. Inspect coil
monthly — clean as required.
CONDENSATE DRAIN — Check and clean each year at
start of cooling season.
FILTERS — Clean or replace at start of each heating and
cooling season, or more often if operating conditions re-
quire. Refer to Tables 1A and 1B for type and size.
DEFROST
THERMOSTAT
NOTE: Defrost thermostat is located at the bottom tee of circuit
no. 1 and the top tee of circuit no. 2.
Fig. 21 — Defrost Thermostat Location
16

OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use throw-
away filters in place of screens.
Lubrication
COMPRESSORS — Each compressor is charged with cor-
rect amount of oil at the factory. Observe the level in the
sight glass immediately after shutdown while the oil is still
warm. If the oil level is observed when the oil is cold, the
level observed may be a mixture of oil and refrigerant which
is not a true indication of the oil level. If oil level observed
is not between the low limit and high limit levels as indi-
cated in Fig. 22, add oil until it is in the correct range.
FAN SHAFT BEARINGS — For size 014 units, the bear-
ings are permanently lubricated. No field lubrication is re-
quired. For size 016 units, the bearings are of the pillow block
type and have grease fittings. The bearing opposite the mo-
tor end has an extended tube line so it can be lubricated from
the motor side. Lubricate the bearings twice annually.
Typical lubricants are given below:
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Mobil Mobilplex EP No. 1
Sunoco Prestige 42
Texaco Multifak 2
*Preferred lubricant because it contains rust and oxidation inhibitors.
OUTDOOR AND INDOOR-FAN MOTOR BEARINGS —
The outdoor and indoor-fan motors have permanently-
sealed bearings, so no field lubrication is necessary.
Indoor Fan, 50HJQ014 Units
PERFORMANCEADJUSTMENT — Fan motor pulleys on
the 50HJQ014 units are factory set for speed shown in
Tables 1A and 1B.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting plate nuts.
3. Loosen movable-pulley flange setscrew (see Fig. 23).
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maxi-
mum speed specified in Tables 1A and 1B .
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from mount-
ing plate.
SERVICE AND REPLACEMENT (see Fig. 24)
NOTE: To remove belts only, follow Steps 1-7.
1. Remove filter and supply-air section panels.
2. Remove unit top panel.
3. Remove coil guard.
4. Loosen screws A and B on both sides of motor mount
assembly.
5. Loosen screw C.
6. Rotate motor mount assembly (with motor attached) as
far as possible away from indoor coil.
7. Remove belt.
8. Rotate motor mount assembly back past original posi-
tion toward indoor coil.
9. Remove motor mounting nuts D and E (both sides).
10. Lift motor up through top of unit.
11. Reverse Steps 1-10 to install new motor.
12. Check and adjust belt tension as necessary.
Fig. 22 — Compressor Sight Glass Oil Level
Fig. 23 — Indoor-Fan Pulley Alignment
and Adjustment
Fig. 24 — 50HJQ014 Indoor-Fan Motor Section
17

Indoor Fan, 50HJQ016 Units
PERFORMANCEADJUSTMENT— Fan motor pulleys are
factory set for speed shown in Tables 1A and 1B.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen nuts on the 2 carriage bolts in the mounting base.
Install jacking bolt and plate under motor base (bolt and
plate are shipped in installer’s packet). Using bolt and
plate, raise motor to top of slide and remove belt. Secure
motor in this position by tightening the nuts on the car-
riage bolts.
3. Loosen movable-pulley flange setscrew (See Fig. 23).
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maxi-
mum speed specified in Tables 1A and 1B.
See Table 5 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Tables 1A and 1B for speed change
for each full turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section below.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from mount-
ing plate.
SERVICE AND REPLACEMENT (See Fig. 25) — The
50HJQ016 units use a fan motor mounting system that fea-
tures a slide-out motor mounting plate. To replace or service
the motor, slide out the bracket.
1. Remove the indoor-fan access panel and the heating con-
trol access panel.
2. Remove the center post (located between the indoor fan
and heating control access panels) and all screws secur-
ing it.
3. Loosen nuts on the two carriage bolts in the motor mount-
ing base.
4. Using jacking bolt under motor base, raise motor to top
of slide and remove belt. Secure motor in this position
by tightening the nuts on the carriage bolts.
5. Remove the belt drive.
6. Remove jacking bolt and tapped jacking bolt plate.
7. Remove the 2 screws that secure the motor mounting
plate to the motor support channel.
8. Remove the 3 screws from the end of the motor support
channel that interfere with the motor slide path.
9. Slide out the motor and motor mounting plate.
10. Disconnect wiring connections and remove the 4 mount-
ing bolts.
11. Remove the motor.
12. To install the new motor, reverse Steps 1-11.
13. Check and adjust belt tension as necessary.
Belt Tension Adjustment — To adjust belt tension:
1. Loosen fan motor bolts.
2. a. Size 014 units:
Move motor mounting plate up or down for proper belt
tension (
1
⁄ 2 -in. deflection with one finger).
b. Size 016 units:
Turn motor jacking bolt to move motor mounting plate
up or down for proper belt tension (
3
⁄ 8 -in. deflection at
midspan with one finger [9 lb force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure motor
in fixed position.
Outdoor-Fan Adjustment (Fig. 26)
1. Turn off unit power supply.
2. Remove access panel(s) closest to the fan to be adjusted.
3. Loosen fan hub setscrews.
4. Adjust the fan height on the shaft using a straightedge
placed across the fan orifice.
5. Tighten setscrews and replace panel(s).
6. Turn on unit power.
NOTE:An 89 mm (3
1
⁄ 2 -in.) bolt and threaded plate are included in the
installer’s packet. They can be added to the motor support channel
below the motor mounting plate to aid in raising the motor.
Fig. 25 — 50HJQ016 Indoor-Fan
Motor Section
NOTE:Dimensionsarein millimeters. Dimensionsin( ) are ininches.
Fig. 26 — Outdoor Fan Adjustment
18

Economizer Adjustment — Refer to Tables 11 and
12 for economizer checkout procedures. Make certain the
outdoor-air damper is fully closed and the return-air damper
is fully open before completing the following steps.
1. Turn on power to the unit.
2. Turn the thermostat fan switch to the ON position. The
damper will go to the vent position.
3. Adjust the vent position with the minimum position ad-
justment on the economizer control module. See
Fig. 14.
4. Set the system selector switch to COOLposition and set
the cooling temperature selector to its lowest setting.
NOTE: The cooling mode may also be simulated by re-
moving the thermostat wires from terminals Y1 and Y2
and installing a jumper between terminals R andY1. Re-
fer to unit label diagram for terminal locations.
5. Set the outdoor-air thermostat (OAT) located in the econo-
mizer section of the unit to 23.9 C (75 F).
6. If the outdoor temperature is below 23.9 C (75 F), the
economizer will control the mixed air with the mixed-
air sensor. If the outdoor air is above 23.9 C (75 F), place
a jumper around the contacts of the OAT.
7. Jumper terminal T to terminal T1 on the module (see
Fig. 14). The economizer will go to the full open
position. The outdoor-air damper will go to the full open
position, and the return-air damper will go to the full
closed position.
8. Adjust mechanical linkage, if necessary, for correct po-
sitioning. It may be necessary to remove the filters to
adjust the linkage.
9. Remove the jumper from around the contacts of the OAT
if installed in Step 6. Remove the jumper from termi-
nals T and T1 installed in Step 7.
10. If the cooling mode was simulated to operate the unit in
Step 4, remove the jumper and reconnect the thermostat
wires to terminals Y1 and Y2.
Table 11 — Economizer Checkout Procedures
TEST PROCEDURE RESULTS
A. Disconnect power at
TR and TR1.
Disconnect jumper
between P and
P1. See Fig. 14.
B. Jumper TR to 1.
C. Jumper T1 to T.
D. Disconnect outdoor-air
thermostat connections
from S
O
and +.
Factory-installed
800 ohm resistor
should remain connected
to S
R
and +.
E. Reconnect power to
terminals TR and TR1. 1. LED (light-emitting diode)
should be off.
2. Motor is in closed position.
TEST PROCEDURE RESULTS
A. Disconnect
factory-installed
resistor from
terminals S
R
and +. 1. LED (light-emitting diode)
should be on.
2. Motor drives toward open.
Table 12 — High and Low Outdoor-Air
Temperature Simulation
TEST PROCEDURE RESULTS
A. Reconnect factory-
installed 800 ohm resistor
between terminals
S
R
and +.
B. Connect 1200 ohm
checkout resistor
between terminals
S
O
and +.
C. Turn set point potentiom-
eter to position A. Low outdoor-air temperature
test results:
1. LED (light-emitting diode)
should be on.
2. Motor drives toward open.
D. Turn set point potentiom-
eter to position D.
E. Disconnect 1200 ohm
checkout resistor. High outdoor-air temperature
test results:
1. LED should be off.
2. Motor drives toward closed.
PowerFailure — Dampers have a spring return. In event
of power failure, dampers will return to fully closed position
until power is restored. Do not manually operate damper
motor.
Refrigerant Charge — Amount of refrigerant charge
is listed on unit nameplate and in Tables 1A and 1B. Refer
to Carrier GTAC II; Module 5; Charging, Recovery, Recy-
cling, and Reclamation section for charging methods and
procedures.
Unit panels must be in place when unit is operating dur-
ing charging procedure.
NO CHARGE — Use standard evacuating techniques.
After evacuating system, weigh in the specified amount of
refrigerant (refer to Tables 1A and 1B).
LOW CHARGE, COOLING — Using cooling charging chart
(see Fig. 27 and 28), add refrigerant until conditions of the
chart are met. Note that charging chart is different from those
normally used. Chart is based on charging units to correct
superheat for various operating conditions.An accurate pres-
sure gage and temperature sensing device are required. Con-
nect temperature sensing device to service port on suction
line and insulate it so that outdoor ambient temperature does
not affect reading. Indoor-air cfm must be within normal op-
erating range of unit.
TO USE COOLING CHARGING CHART — Take outdoor
ambient temperature and read the suction pressure gage.
Refer to appropriate chart to determine correct suction tem-
perature. If suction temperature is high, add refrigerant. If
suction temperature is low, carefully recover some of the charge.
Recheck suction pressure as charge is adjusted.
Example (Fig. 28)
Outdoor Temperature ....................29C(85F)
Suction Pressure ....................483Pa(70psig)
Suction Temperature Should Be ..........12.2 C (54 F)
(Suction Temperature may vary±5F.)
LOW CHARGE, HEATING — If outdoor ambient tempera-
ture is above 4.4 C (40 F), operate unit in cooling and refer
to Low Charge, Cooling section above. If outdoor ambient
is below 4.4 C (40 F), evacuate system and weigh in speci-
fied amount of refrigerant. (Refer to Tables 1A and 1B.)
19

Filter Drier — Replace whenever refrigerant system is
exposed to atmosphere.
Protective Devices
COMPRESSOR PROTECTION
Overcurrent — Each compressor has one manual reset, cali-
brated trip, magnetic circuit breaker. Do not bypass connec-
tions or increase the size of the circuit breaker to correct trouble.
Determine the cause of the trouble and correct it before re-
setting the breaker.
Overtemperature — Each compressor has an internal pro-
tector to protect it against excessively high discharge gas
temperatures.
Crankcase Heaters — Each compressor has a 125-watt crank-
case heater to prevent absorption of liquid refrigerant by oil
in the crankcase when the compressor is idle. Since power
for the crankcase heaters is drawn from the unit incoming
power, main unit power must be on for the heaters to be
energized.
IMPORTANT: After a prolonged shutdown or serv-
ice job, energize the crankcase heaters for 24 hours
before starting the compressors.
Compressor Lockout — If any of the safeties (high- or low-
pressure, freeze protection thermostat, compressor internal
thermostat) trip, or if there is loss of power to the compres-
sors, the CLO (compressor lockout) will lock the compres-
sors off. To reset, manually move the thermostat setting.
INDOOR-FAN MOTOR PROTECTION —A manual reset,
calibrated trip, magnetic circuit breaker protects against over-
current. Do not bypass connections or increase the size of
the breaker to correct trouble. Determine the cause and cor-
rect it before resetting the breaker.
OUTDOOR-FAN MOTOR PROTECTION — Each outdoor-
fan motor is internally protected against over-temperature.
HIGH- AND LOW-PRESSURE SWITCHES — If either
switch trips, or if the compressor overtemperature switch
activates, that refrigerant circuit will be automatically locked
out by the CLO. To reset, manually move the thermostat
setting.
FREEZE PROTECTION THERMOSTAT (FPT) — An
FPT is located on the indoor coil. It detects frost build-up
and turns off the compressor, allowing the coil to clear. Once
the frost has melted, the compressor can be reenergized by
resetting the CLO from the thermostat.
Relief Devices — All units have relief devices to pro-
tect against damage from excessive pressures (i.e., fire). These
devices protect the high and low side.
Control Circuit, 24-V — This control circuit is pro-
tected against overcurrent by a 3.2-amp circuit breaker. Breaker
can be reset. If it trips, determine cause of trouble before
resetting. A typical wiring diagram is shown in Fig. 29.
Replacement Parts — A complete list of replace-
ment parts may be obtained from your local distributor upon
request.
Fig. 27 — Cooling Charging Chart,
50HJQ014 Units
Fig. 28 — Cooling Charging Chart,
50HJQ016 Units
20