Carrier 12, 50LJQ008 User Manual
50LJQ008,012 (50 Hz)
Single-Package Rooftop Heat Pump Units
Installation, Start-Up and Service
Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS .................. 1
INSTALLATION ............................ 1-16
Step 1 — Provide Unit Support .............. 1
• ROOF CURB
• SLAB MOUNT
Step 2 — Field Fabricate Ductwork ........... 1
Step 3 — Make Field Connection for
Condensate Disposal .........................3
Step 4 — Rig and Place Unit ................. 3
Step 5 — Make Electrical Connections ....... 7
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 6 — Adjust Indoor-Fan Speed ...........13
START-UP ................................17-19
SERVICE ..................................19-21
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning equipment
can be hazardous due to system pressure and electrical components. Only trainedandqualified service personnel should
install, repair or service air conditioning equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service personnel. When working on air conditioning equipment, observe precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply.
Follow all safetycodes. Wearsafety glasses andwork gloves.
Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations.
Before performing service or maintenance operations on
unit, turn offmain power switch to unit. Electrical shock
could cause personal injury.
INSTALLATION
Unit is shipped in the vertical configuration. To convert to
horizontal configuration, remove side duct opening covers.
Using the same screws, install covers on vertical duct openings with the insulation-side down. Seals around duct openings must be tight.
IMPORTANT: An external filter kit MUST be used,
or the filters MUST be field-installed outside the unit
on horizontal applications with accessory economizer
or two-position damper. Otherwise, the economizer or
two-position must be partially removed to access the
filters. The area of the field-installed filters should be
equal to the area of the factory-installed filters.
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb
in accordance with instructions shipped with curb. See
Fig. 1. Install insulation, cant strips, roofing and counter flashing as shown. Ductwork must be attached to curb, not to the
unit. If electric or control power is to be routed through the
curb, attach the accessory thru-the-curb service connection
plates to the roof curb in accordance with the accessory installation instructions. Connection plates must be installed
before unit is set in roof curb.
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 1. Improperly applied gasket also can result in air leaks and poor
unit performance.
Curb should be level. Unit leveling tolerances are shown
in Fig. 2. This is necessary for unit drain to function properly. Refer to Accessory Roof Curb Installation Instructions
for additional information as required.
SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 152 mm (6 in.) beyond unit cabinet. The slab should be 203 mm (8 in.) thick
with 102 mm (4 in.) above grade. Install a gravel apron in
front of outdoor coil air inlet to prevent grass and foliage
from obstructing airflow. In areas where high snowfall
occurs, increase height of slab to ensure that snow does not
block coil.
NOTE: Horizontal units may be installed on a roof curb if
required.
Step 2 — Field Fabricate Ductwork — On verti-
cal discharge units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. For horizontal
applications, field-supplied flanges should be attached to horizontal discharge openings and all ductwork attached to the
flanges. 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.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with applicable fire codes.
Aminimumclearance to combustibles is not required around
ductwork on vertical discharge units. On horizontal discharge units, a minimum clearance of 25 mm (one in.) is
required for the first 305 mm (12 in.) of ductwork.
Cabinet return-air static shall not exceed −87 Pa
(−.35 in. wg) with economizer or −112Pa (−.45 in. wg) without economizer.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 015-015 Printed in U.S.A. Form 50LJQ-C1SI Pg 1 1-92 Replaces: New
ROOF CURB
ACCESSORY
50DJ901371
50DJ901381
‘‘A’’ UNIT SIZE
18-29
[356]
50LJQ008,012
28-09
[610]
UNIT SIZE ‘‘F’’ POWER ‘‘G’’ CONTROL
50LJQ008,012
19 [25] NPT or
29 [51] NPT
NOTES:
1. Roof curb accessory is shipped unassembled.
2. Insulated panels: 25 mm (one in.) thick polyurethane foam, .8 Kg (1
3. Dimensions in [ ] are in millimeters.
4. Roof curb: 16-gage steel.
5. Attachductworktocurb (flanges of duct rest on curb).
6. Service clearance 1219 mm (4 ft) on each side.
3
⁄49 [19] NPT 50DJ901311
7. Direction of airflow.
8. Control and power service plates are part of a separately shipped accessory package.
3
⁄4lb) density.
CONNECTOR
PKG. ACC.
Fig. 1 — Roof Curb Dimensions
2
MAXIMUM ALLOWABLE DIFFERENCE
A-B B-C A-C
mm in. mm in. mm in.
13 .5 25 1.0 25 1.0
Fig. 2 — Unit Leveling Tolerance
Step 3 — Make Field Connection for CondensateDisposal —
See Fig. 3. A3⁄4-in. FPT connection is located on the side of
the unit. Use a trap at least 100 mm (4 in.) deep, and protect
against freeze-up.
If drain line is run to a drain, pitch line away from unit at
25 mm (one in.) per 3 m (10 ft) of run. Do not use a pipe size
smaller than the unit connection.
Units must have an external trap added.
Step4 — Rig andPlace Unit — Inspect unit for trans-
portation damage. File any claim with transportation agency.
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used to
move unit across a roof. Level by using unit frame as a reference. See Tables 1A and 1B and Fig. 4 for additional information. Operating weight is shown in Tables 1A and 1B
and Fig. 4.
Lifting holes are provided in base rails as shown in
Fig. 4 and 5. Refer to rigging instructions on unit.
All panels must be in place when rigging.
POSITIONING — Maintain clearance around and above unit
to provide proper air flow and service access. See Fig. 5.
Position unit on roof curb so that the following clearances
are maintained; 6 mm (
1
⁄4in.) clearance between roof curb
and base rails on each side and front of unit: 29 mm (15⁄
in.) clearance between roof curb and rear of unit (see Fig. 1,
section C-C).
Do not install unit in an indoor location. Do not locate
unit air inlet near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove polyethylene shipping wrapper and rigging skid.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 100 mm (4 in.) trap is recommended.
Fig. 3 — External Trap Condensate Drain
32
NOTES:
1. Dimensions in ( ) is in millimeters.
2. Hood rigging shackles through holes in base rail, as shown in
detail ‘‘A’’. Holes in base rails are centered around the unit center
of gravity. Use wooden top skid when rigging to prevent rigging
straps from damaging unit.
3. Weightsdonotincludeeconomizer .SeeTables1A and 1B for economizer weights.
All panels must be in place when rigging.
Fig. 4 — Rigging Details
UNIT
50LJQ
008 840 381 87.38 2219 40.25 1022 41.31 1050
012 940 426 87.38 2219 40.25 1022 48.31 1253
MAX
WEIGHT
lb kg in. mm in. mm in. mm
‘‘A’’ ‘‘B’’ ‘‘C’’
DIMENSIONS
3
Table 1A — Physical Data (SI)
BASE UNIT 50LJQ 008 012
NOMINAL CAPACITY (kW) 23.2 28.8
OPERATING WEIGHT (kg)
Unit 381 426
With Economizer 401 446
Roof Curb 101 101
COMPRESSOR
Quantity 22
Oil (ml) (each compressor) 1627 2071
REFRIGERANT TYPE
Operating Charge (kg)
Circuit 1 3.7 4.0
Circuit 2 3.2 3.9
OUTDOOR FAN
Quantity...Diameter (mm) 1...660 1...660
Nominal L/s 2900 3260
Motor BkW...r/s .25...16.0 .25...16.0
OUTDOOR COIL
Rows...Fins/m 2...669 2...669
Total Face Area (sq m) 1.9 2.3
INDOOR FAN
Size (mm) 381 x 381 381 x 381
Type Drive Belt Belt
Nominal L/s 1200 1600
Motor BkW per NEC* 1.12 1.50
Maximum Continuous BkW 1.79 2.16
Motor Frame 56 56
Fan r/s Range 10.30-14.70 11.50-15.00
Motor Bearing Type Ball Ball
Maximum Fan r/s 26.7 26.7
Motor Pulley Pitch Diameter
A/B (mm)
Fan Pulley Pitch Diameter (mm) 140 178
Belt — Type...Length (mm) A...1219 A...1295
Pulley Center Line Distance (mm) 425-489 464-527
Fan Shaft Diameter at Pulley (mm) 25 25
Speed Change per Full Turn of
Movable Pulley Flange (r/s)
Movable Pulley Maximum Full
Turns from Closed Position
Factory Setting — Full Turns Open 55
Factory Speed Setting (r/s) 10.3 11.5
INDOOR COIL Enhanced Copper Tubes, Aluminum Double Wavy Fins,
Rows...Fins/m 3...590 3...590
Total Face Area (sq m) .74 .93
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (mm)
RETURN-AIR FILTERS Disposable
Quantity...Size (mm)
Enhanced Copper Tubes, Aluminum Fins, Acutrol™ Feed Device
61/86 86/112
.88 .70
55
4...406 x 508 x 50 4...508 x 508 x 50
LEGEND
BkW — Brake Kilowatt
NEC — National Electrical Code (U.S.A. Standard)
*Used to determine wire sizing per NEC.
Hermetic
R-22
Propeller
Centrifugal
Acutrol Feed Device
1...508 x 635 x 25
1...406 x 635 x 25
4
Table 1B — Physical Data (English)
BASE UNIT 50QJ 008 012
NOMINAL CAPACITY (tons) 6.6 8.2
OPERATING WEIGHT (lb)
Unit 840 940
With Economizer 884 984
Roof Curb 223 223
COMPRESSOR
Quantity 22
Oil (fluid oz) (each compressor) 55 70
REFRIGERANT TYPE
Operating Charge (lb-oz)
Circuit 1 8-2 8-14
Circuit 2 7-0 8-10
OUTDOOR FAN
Quantity...Diameter (in.) 1...26 1...26
Nominal Cfm 6100 6900
Motor Hp...Rpm
OUTDOOR COIL
Rows...Fins/in. 2...17 2...17
Total Face Area (sq ft) 20.5 25.0
INDOOR FAN
Size (in.) 15x15 15x15
Type Drive Belt Belt
Nominal Cfm 2600 3400
Horsepower per NEC* 1.5 2.0
Maximum Continuous Bhp 2.4 2.9
Motor Frame 56 56
Fan Rpm Range 622-882 692-896
Motor Bearing Type Ball Ball
Maximum Fan Rpm 1600 1600
Motor Pulley Pitch Diameter
A/B (in.)
Fan Pulley Pitch Diameter (in.) 5.5 7.0
Belt — Type...Length (in.) A...48 A...51
Pulley Center Line Distance (in.) 16.75-19.25 18.25-20.75
Fan Shaft Diameter at Pulley (in.) 11
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full
Turns from Closed Position
Factory Setting — Full Turns Open 55
Factory Speed Setting (Rpm) 620 690
1
⁄3...960
Enhanced Copper Tubes, Aluminum Fins, Acutrol™ Feed Device
2.4/3.4 3.4/4.4
52 42
55
INDOOR COIL Enhanced Copper Tubes, Aluminum Double Wavy Fins,
Rows...Fins/in. 3...15 3...15
Total Face Area (sq ft) 8.0 10.0
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (in.)
RETURN-AIR FILTERS
Quantity...Size (in.) 4...16 x 20 x 2 4...20 x 20 x 2
LEGEND
Bhp — Brake Horsepower
NEC — National Electrical Code (U.S.A. Standard)
*Used to determine wire sizing per NEC.
Hermetic
R-22
Propeller
Centrifugal
Acutrol Feed Device
1...20 x 25 x 1
1...16 x 25 x 1
Disposable
1
⁄3...960
5
UNIT
50LJQ
STD. UNIT
WEIGHT
Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm Ft-in. mm
ECONOMIZER
WEIGHT
CORNER
WEIGHT ‘‘A’’
CORNER
WEIGHT ‘‘B’’
CORNER
WEIGHT ‘‘C’’
CORNER
WEIGHT ‘‘D’’
008 840 381 44 20 182 83 156 71 231 105 271 123 2-0
012 940 426 44 20 204 93 174 79 259 117 303 137 1-2
NOTES:
1. Dimensions in [ ] are in millimeters.
2. Center of gravity.
3. Direction of airflow.
4. Ductwork to be attached to accessory roof curb only.
5. Minimum clearance (local codes or jurisdiction may prevail):
a. Bottom to combustible surfaces (when not using curb) 25 mm
(one in.).
b. Condenser coil, for proper airflow, 914 mm (36 in.) one side,
305 mm (12 in.) the other. The side getting the greater clearance is optional.
c. Overhead 1524 mm (60 in.) to assure proper outdoor fan
operation.
d. Between units, control box side, 1067 mm (42 in.).
e. Between unit and ungrounded surfaces, control box side, 914
mm (36 in.).
f. Between unit and block or concrete walls and other grounded
surfaces, control box side 1067 mm (42 in.).
g. Horizontal supply and return end, zero mm (zero in.).
6. With the exception of the clearance for the outdoor coil as stated
in notes 5b and c, a removable fence or barricade requires no
clearance.
‘‘H’’ ‘‘J’’ ‘‘K’’
7
⁄8632 3-55⁄161050 2-911⁄16856
7
⁄8378 4-15⁄161253 3-03⁄8924
CONNECTION SIZES
3
⁄89 dia [35] field power supply hole
A 1
1
⁄29 dia [64] power supply knockout
B 2
3
⁄49 dia [44] charging-port hole
C 1
7
⁄89 dia [22] field control wiring hole
D
3
⁄49-14 NPT condensate drain
E
F 29 dia [51] power supply knockout
Fig. 5 — Base Unit Dimensions
6
Step 5 — Make Electrical Connections
Unit cabinet must have uninterrupted, unbroken electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground
may consist of electrical wire connected to unit ground
lug in control compartment, or conduit approved for electrical ground when installed in accordance with U.S.A.
National Electrical Code (Ref: ANSI/NFPA 70-1987)
or equivalent local electrical codes. Failure to follow this
warning could result in the installer being liable for personal injury of others.
FIELD POWER SUPPLY — Pigtails are provided for field
wire connections. Use factory-supplied splices or copper/
aluminum connector.
When installing units, provide a disconnect per local codes.
All field wiring must comply with local requirements.
Install conduit through side panel openings. For units without electric heat, install conduit between disconnect and control box. Install power lines to terminal connections as shown
in Fig. 6. For units with electric resistance heat, refer to Table
2 to determine appropriate power wiring figure (Fig.7-13)
and route lines as indicated in appropriate figure.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate (also see
Table 2). On 3-phase units, voltages between phases must be
balanced within 2% and the current within 10%. Use the formula shown in Table 2, Note 3 to determine the % voltage
imbalance. Operation on improper line voltage or excessive
phase imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate any
applicable Carrier warranty.
When electric heat is installed, remove knockouts for appropriate size conduit from unit block-off panel and single
point box. Install conduit (rigid or electro-metallic tubing)
through conduit drip boot as shown in Fig. 14. Drip boot
eliminates the need for water tight conduit fittings at the single
point box. Refer to Fig. 15 for component locations.
LEGEND
C—Contactor
IFC — Indoor-Fan Contactor
TB — Terminal Block
Field Wiring
Factory Wiring
Splice Connection (Factory Supplied)
Fig. 6 — Power Wiring Connections
LEGEND FOR FIG. 7-13
EQUIP — Equipment
FU — Fuse
GND — Ground
HTR — Heater
TB — Terminal Block
Fig. 7 — Electric Heater Power Wiring Connections — 50LJQ, 220-3-50 and 400-3-50;
Single Point Kit 50DJ902021 and 50DJ902071
7
Fig. 8 — Electric Heater Power Wiring Connections — 50LJQ, 400-3-50;
Single Point Kit 50DJ902041 and 50DJ902101
Fig. 9 — Electric Heater Power Wiring Connections — 50LJQ, 400-3-50;
Single Point Kit 50DJ902061 and 50DJ902121
8
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