Carrier 50AJ v2 Installation Instructions
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500059-01 Printed in U.S.A. Form 50A-7SI Pg 1 8-09 Replaces: 50A-5SI
Installation Instructions CONTENTS
Page SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50 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 . . . . . . . . . . . . . . . 2 Step 4 Make Unit Duct Connections . . . . . . . . . . . 2 Step 5 Trap Condensate Drain . . . . . . . . . . . . . . . . 20 Step 6 Make Electrical Connections . . . . . . . . . . 20 POWER WIRING FIELD POWER SUPPLY FIELD CONTROL WIRING Step 7 Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 ECONOMIZER AND FIXED OUTDOOR
AIR DAMPER Step 8 Position Power Exhaust/Barometric
Relief Damper Hood. . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Step 9 Route Static Pressure Sensors . . . . . . . . 48 Step 10 Install All Accessories . . . . . . . . . . . . . . . 48 Step 11 Field Modifications. . . . . . . . . . . . . . . . . . . 50
SAFETY CONSIDERATIONS Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo- nents. Only trained and qualified service personnel should in- stall, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance functions 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, 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 extinguishers available for all brazing operations.
INSTALLATION
Step 1 Provide Unit Support
ROOF CURB For vertical discharge units, assemble or in- stall accessory roof curb in accordance with instructions shipped with this accessory. See Fig. 1-4. Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be installed to roof curb before unit is set in place. Curb should be level. This is necessary to permit unit drain to func- tion properly. Unit leveling tolerance is shown in Fig. 1-4. Refer to Accessory Roof Curb Installation Instructions for additional information as required. When accessory roof curb is used, unit may be installed on class A, B, or C roof covering material.
ALTERNATE UNIT SUPPORT When the preferred curb or slab mount cannot be used, support unit with sleepers on perimeter, using unit curb support area. If sleepers cannot be used, support long sides of unit (refer to Fig. 5-10) with a mini- mum number of 4-in. x 4-in. pads spaced as follows: 50AJ,AK,AW,AY020-035 units require 3 pads on each side; 50AJ,AK,AW,AY036-050 units require 4 pads on each side; 50AJ,AK,AW,AY051 and 060 units require 6 pads on each side. Unit may sag if supported by corners only.
Step 2 Rig and Place Unit Inspect unit for transportation damage. See Tables 1-6 for physical data and specifications. File any claim with transportation agency.
Do not drop unit; keep upright. Use spreader bars over unit to prevent sling or cable damage. This unit must be handled with a crane and can not be handled by a fork truck. Level by using unit frame as a reference; leveling tolerance is shown in Fig. 1-4. See Fig. 11 for additional information. Unit operating weight is shown in Tables 2-5.
WARNING
Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.
WARNING
1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life.
2. Do not store or use gasoline or other flammable va- pors and liquids in the vicinity of this or any other appliance.
CAUTION
1. All panels must be in place when rigging or damage to unit may occur.
2. Unit is not designed for handling by fork truck.
IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket with the roof curb as shown in Fig. 1-4. Improperly applied gasket can also result in air leaks and poor unit performance.
WEATHERMAKER
50AJ,AK,AW,AY020-060 Single Package Rooftop Units
Electric Cooling with Electric Heat Option with Scroll Compressor
and COMFORTLINK Controls
2
NOTE: On retrofit jobs, ductwork may be attached to the old unit instead of a roof curb. Be careful not to damage ductwork when removing old unit. Attach existing ductwork to roof curb instead of unit.
Four lifting lugs are provided on the unit base rails as shown in Fig. 5-11. Refer to rigging instructions on unit. POSITIONING Maintain clearance, per Fig. 5-11, around and above unit to provide minimum distance from combustible materials, proper airflow, and service access.
Do not install unit in an indoor location. Do not locate unit 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 distribu- tion requirements. See Fig. 12. Unit operating weight are shown in Tables 2-5.
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. NOTE: Due to width of the horizontal supply and return duct- work, provisions should be made for servicing of the outdoor air filters (i.e., catwalk over ductwork).
Ducts passing through an unconditioned space must be in- sulated and covered with a vapor barrier. Outlet grilles must not lie directly below unit discharge. The return duct must have a 90-degree elbow before opening into the building space if the unit is equipped with power exhaust.
To attach ductwork to roof curb, insert duct approximately 10 to 11 in. up into roof curb. Connect ductwork to 14-gage roof curb material with sheet metal screws driven from inside the duct.
Follow AMCA (Air Movement and Control Association) guidelines relating to ductwork connections to the unit. These guidelines recommend a minimum 21/2 equivalent duct diameters of straight duct connected to supply air inlet and
outlet openings before any transitions, fittings, dampers, etc. Failure to adhere to these guidelines may result in system ef- fects which can impact the units ability to achieve published performance.
Step 4 Make Unit Duct Connections 50AJ AND AK UNITS Unit is shipped for thru-the- bottom duct connections. Field-fabricated ductwork should be attached to the roof curb. Supply and return duct dimensions are shown in Fig. 5-7. Air distribution is shown in Fig. 13. Refer to installation instructions shipped with roof curb for more information. 50AW AND AY UNITS Remove shipping covers from supply and return air openings. Attach field-supplied ductwork to unit. Connect to the unit with a single duct for all supply openings and with a single duct for all return openings. Splitting of the airflow into branch ducts should not be done at the unit. Sufficient duct length should be used prior to branch- ing to ensure the air temperatures are well mixed within the ductwork. See Fig. 8-10 for duct opening dimensions. Secure all ducts to building structure. Air distribution is shown in Fig. 8-10 and Fig. 14.
Install accessory barometric relief or power exhaust in the field-fabricated return ductwork. Refer to Step 8 Position Power Exhaust/Barometric Relief Damper Hood section on page 48 for more information.
Instructions continued on page 20.
WARNING
For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90-degree elbow turn in the supply and 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.
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N O
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cl ud
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on om
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c
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N O
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cl ud
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c
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D im
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] a
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m ill
im et
er s.
A ll
ot he
r di
m en
si on
s ar
e in
in ch
es .
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11
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PE R
AT IN
G W
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H T
IN C
LU D
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A RG
ES T
IN D
O O
R FA
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D V
A RI
A B
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FR EQ
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C Y
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(V A
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LU M
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D im
en si
o n
s
5 0A
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6- 05
0
N O
T E
S :
1. W
ei gh
ts in
cl ud
e ec
on om
iz er
. 2.
c
en te
r o f g
ra vi
ty .
3. U
ni t c
le ar
an ce
s:
T op
o f u
ni ts
: n o
ov er
ha ng
C
on de
ns er
c oi
l: 4
- 0
[1 21
9]
E co
no m
iz er
s id
e: 6
- 0
[ 18
29 ]
H
ea t s
id e:
4 -
0 [
12 19
]
F ilt
er a
cc es
s si
de : 1
0 -
0 [3
04 8]
(f or
re m
ov al
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va po
ra to
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Fo r
sm al
le r
se rv
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an d
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at io
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s, c
on ta
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er in
g de
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m en
t. 5.
D im
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on s
in [
] a re
in m
ill im
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s. A
ll ot
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s ar
e in
in ch
es .
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F O
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N O
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1. W
ei gh
ts in
cl ud
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iz er
o r o
ut do
or a
ir da
m pe
r. 2.
c
en te
r o f g
ra vi
ty .
3. U
ni t c
le ar
an ce
s:
T op
o f u
ni ts
: n o
ov er
ha ng
C
on de
ns er
c oi
l: 4
- 0
[1 21
9]
E co
no m
iz er
s id
e: 6
- 0
[ 18
29 ]
H
ea t s
id e:
4 -
0 [
12 19
]
F ilt
er a
cc es
s si
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14
Table 1 Physical Data 50AJ,AK,AW,AY Units
LEGEND *Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper portion. Sizes 050-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have intertwined evaporator coils.
UNIT 50AJ,AK,AW,AY 020 025 027 030
NOMINAL CAPACITY (tons) 20 25 27 30
BASE UNIT See Base Unit Weights Table OPERATING WEIGHT (lb)
COMPRESSOR
Quantity...Type (Ckt 1, Ckt 2) 2SR*782AT/1SR*782AE 1SR*812AT, 1SR*942AT/1SR*942AE 2...SR*942AT/1SR*942AE 2SR*782AT/2SR*812AT
Number of Refrigerant Circuits 2 2 2 2 Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged Precharged
REFRIGERANT TYPE R-22 Operating Charge (lb-oz)
Circuit 1 26-8 33-8 35-8 29-0 Circuit 2 14-0 17-8 20-0 30-8
CONDENSER COIL* Internally Enhanced, 3/8 Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins Quantity 1 1 1 1 Rows...Fins/in. 2...15 3...15 3...15 4...15 Total Face Area (sq ft) 33.3 33.3 33.3 33.3
CONDENSER FAN Propeller Type Nominal Cfm 17,200 15,850 15,850 14,500 Quantity...Diameter (in.) 2...30 2...30 2...30 2...30 Motor Hp 1 1 1 1
EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits Tube Size (in.) 3/8 3/8 3/8 3/8 Rows...Fins/in. 3...15 3...15 4...15 4...15 Total Face Area (sq ft) 31.7 31.7 31.7 31.7
EVAPORATOR FAN Centrifugal Type Quantity...Size (in.) 2...20 X 15 2...20 X 15 2...20 X 15 2...20 X 15 Type Drive Belt Belt Belt Belt Nominal Cfm 8,000 10,000 11,000 12,000 Motor Hp 5 10 15 5 10 15 10 15 20 10 15 20 Motor Frame Size 184T 215T 254T 184T 215T 254T 215T 254T 256T 215T 254T 256T Motor Bearing Type Ball Ball Ball Ball Maximum Allowable Rpm 1200 1200 1200 1200 Motor Pulley Pitch Diameter (in.) 4.8 4.4 5.7 4.8 6.1 5.5 4.4 4.9 5.9 4.4 5.7 5.9 Nominal Motor Shaft Diameter (in.) 11/8 13/8 15/8 11/8 13/8 15/8 13/8 15/8 15/8 13/8 15/8 15/8 Fan Pulley Pitch Diameter (in.) 12.4 8.6 9.1 12.4 11.1 8.7 9.4 8.1 8.7 9.5 9.1 8.7 Nominal Fan Shaft Diameter (in.) 115/16 115/16 115/16 115/16 Belt Quantity 1 1 2 1 1 2 2 2 2 2 2 2 Belt Type BX56 BX50 5VX530 BX56 5VX570 5VX530 BX50 5VX530 5VX530 BX50 5VX530 5VX530 Belt Length (in.) 56 63 53 56 57 53 50 50 53 50 53 53 Pulley Center Line Distance (in.) 16.0-18.7 15.6-18.4 15.0-17.9 15.6-18.4 15.6-18.4 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9 Factory Speed Setting (rpm) 717 924 1096 773 962 1106 848 1059 1187 856 1096 1187
HIGH-PRESSURE SWITCH (psig) Cutout 426 426 426 426 Reset (Auto.) 320 320 320 320
MIXED-AIR FILTERS Quantity...Size (in.) Standard 10...20 x 24 x 2 10...20 x 24 x 2 10...20 x 24 x 2 10...20 x 24 x 2
Pleated 5... 20 x 20 x 4 5...20 x 24 x 4
5...20 x 20 x 4 5...20 x 24 x 4
5...20 x 20 x 4 5...20 x 24 x 4
5...20 x 20 x 4 5...20 x 24 x 4
OUTDOOR-AIR FILTERS
Quantity...Size (in.) 8...16 x 25 x 2 4...20 x 25 x 2
POWER EXHAUST Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan Housing
Motor, Quantity...Hp 4...1 Fan, Diameter...Width (in.) 11 x 10
Al Aluminum Cu Copper
15
Table 1 Physical Data 50AJ,AK,AW,AY Units (cont)
LEGEND *Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper portion. Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have intertwined evaporator coils.
UNIT 50AJ,AK,AW,AY 035 036 040 041
NOMINAL CAPACITY (tons) 35 35 40 40
BASE UNIT OPERATING WEIGHT (lb) See Base Unit Weights Table
COMPRESSOR
Quantity...Type (Ckt 1, Ckt 2) 1SR*812AT, 1SR*942AT/2SR*942AT
1SR*812AT, 1SR*942AT/ 2SR*942AT 2SR*942AT/2SM125 2...SR*942AT/2...SM125
Number of Refrigerant Circuits 2 2 2 2 Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged Precharged
REFRIGERANT TYPE R-22 Operating Charge (lb-oz)
Circuit 1 33-0 36-0 36-0 47-0 Circuit 2 38-0 58-0 47-0 47-0
CONDENSER COIL* Internally Enhanced, 3/8 Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins Quantity 1 2 2 2 Rows...Fins/in. 4...15 2...15/415 2...15/415 415/4...15 Total Face Area (sq ft) 33.3 66.7 66.7 66.7
CONDENSER FAN Propeller Type Nominal Cfm 14,500 30,000 30,000 30,000 Quantity...Diameter (in.) 2...30 4...30 4...30 4...30 Motor Hp 1 1 1 1
EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits Tube Size (in.) 1/2 1/2 1/2 1/2 Rows...Fins/in. 6...16 4...17 4...16 4...17 Total Face Area (sq ft) 31.3 31.3 31.3 31.3
EVAPORATOR FAN Centrifugal Type Quantity...Size (in.) 2...20 X 15 2...20 X 15 2...20 X 15 2...20 X 15 Type Drive Belt Belt Belt Belt Nominal Cfm 14,000 14,000 16,000 16,000 Motor Hp 15 20 25 15 20 25 15 20 25 15 20 25 Motor Frame Size 254T 256T 284T 254T 256T 284T 254T 256T 284T 254T 256T 284T Motor Bearing Type Ball Ball Ball Ball Maximum Allowable Rpm 1300 1300 1300 1300 Motor Pulley Pitch Diameter (in.) 5.1 5.7 6.2 5.3 5.7 7.5 5.3 5.7 7.5 5.3 5.7 6.5 Nominal Motor Shaft Diameter (in.) 15/8 15/8 17/8 15/8 15/8 17/8 15/8 15/8 17/8 157/8 157/8 171/8 Fan Pulley Pitch Diameter (in.) 8.7 8.7 8.7 9.5 9.5 11.1 9.5 9.5 11.1 9.5 9.5 11.1 Nominal Fan Shaft Diameter (in.) 115/16 115/16 115/16 115/16 Belt Quantity 2 2 2 2 2 2 2 2 2 2 2 2 Belt Type 5VX500 5VX530 5VX550 5VX530 5VX550 5VX590 5VX530 5VX550 5VX590 5VX530 5VX550 5VX590 Belt Length (in.) 50 53 55 53 55 59 53 55 59 53 55 59 Pulley Center Line Distance (in.) 15.0-17.9 15.0-17.9 15.0-17.9 15.0-17.9 15.0-17.9 14.6-17.6 15.0-17.9 15.0-17.9 14.6-17.6 15.0-17.9 15.0-17.9 14.6-17.6 Factory Speed Setting (rpm) 1025 1147 1247 976 1050 1182 976 1050 1182 976 1050 1182
HIGH-PRESSURE SWITCH (psig) Cutout 426 426 426 426 Reset (Auto.) 320 320 320 320
MIXED-AIR FILTERS Quantity...Size (in.) Standard 10...20 x 24 x 2 10...20 x 24 x 2 10...20 x 24 x 2 10...20 x 24 x 2
Pleated 5...20 x 20 x 4 5...20 x 24 x 4
5...20 x 20 x 4 5...20 x 24 x 4
5...20 x 20 x 4 5...20 x 24 x 4
5...20 x 20 x 4 5...20 x 24 x 4
OUTDOOR-AIR FILTERS
Quantity...Size (in.) 8...16 x 25 x 2 4...20 x 25 x 2
POWER EXHAUST Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan Housing Motor, Quantity...Hp 4...1 Fan, Diameter...Width (in.) 11 x 10
Al Aluminum Cu Copper
16
Table 1 Physical Data 50AJ,AK,AW,AY Units (cont)
LEGEND *Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper portion. Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have intertwined evaporator coils.
UNIT 50AJ,AK,AW,AY 050 051 060
NOMINAL CAPACITY (tons) 50 50 60
BASE UNIT OPERATING WEIGHT (lb) See Base Unit Weights Table
COMPRESSOR
Quantity...Type (Ckt 1, Ckt 2) 2SM125/1SM125, 1SM175 2...SM125/2...SM125 1...SM160,1...SM175/
1...SM160,1...SM175 Number of Refrigerant Circuits 2 2 2 Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged
REFRIGERANT TYPE R-22 Operating Charge (lb-oz)
Circuit 1 64-4 98-0 81-0 Circuit 2 58-8 98-0 81-0
CONDENSER COIL* Internally Enhanced, 3/8 Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins Quantity 2 2
4...15 2
Rows...Fins/in. 4...15 415 Total Face Area (sq ft) 66.7 100 100
CONDENSER FAN Propeller Type Nominal Cfm 25,600 38,400
6...30 38,400 6...30Quantity...Diameter (in.) 4...30
Motor Hp 1 1 1
EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits Tube Size (in.) 1/2 1/2
4...16 1/2
Rows...Fins/in. 6...16 4...17 Total Face Area (sq ft) 31.3 48.1 48.1
EVAPORATOR FAN Centrifugal Type Quantity...Size (in.) 2...20 X 15 3...20 X 15 3...20 X 15 Type Drive Belt Belt Belt Nominal Cfm 20,000 20,000 24,000
Motor Hp 20 25 30 20 25 30 40
(High Eff.)
40 (Prem.
Eff.) 25 30
40 (High Eff.)
40 (Prem.
Eff.) Motor Frame Size 256T 284T 286T 256T 284T 286T 324T 324T 284T 286T 324T 324T Motor Bearing Type Ball Ball Ball Maximum Allowable Rpm 1300 1200 1200 Motor Pulley Pitch Diameter (in.) 5.7 6.2 6.7 5.9 5.3 5.9 6.5 9.5 5.3 5.9 6.5 9.5 Nominal Motor Shaft Diameter (in.) 15/8 17/8 17/8 15/8 17/8 17/8 21/8 21/8 17/8 17/8 21/8 21/8 Fan Pulley Pitch Diameter (in.) 9.5 9.5 9.5 11.1 9.1 9.5 9.5 13.7 9.1 9.5 9.5 13.7 Nominal Fan Shaft Diameter (in.) 115/16 115/16 115/16 Belt Quantity 2 2 2 2 3 3 3 2 3 3 3 2 Belt Type 5VX550 5VX570 5VX570 5VX560 5VX530 5VX550 5V570 5VX650 5VX530 5VX550 5VX570 5VX650 Belt Length (in.) 55 57 57 56 53 55 57 65 53 55 57 65
Pulley Center Line Distance (in.) 15.0-17.9 14.6-17.6 14.6-17.6 15.0- 17.9
15.2- 17.5
14.7- 17.2 14.2-17.0 14.2-17.0 15.2-
17.5 14.7- 17.2 14.2-17.0 14.2-17.0
Factory Speed Setting (rpm) 1050 1142 1234 930 1019 1087 1197 1197 1019 1087 1197 1197
HIGH-PRESSURE SWITCH (psig) Cutout 426 426 426 Reset (Auto.) 320 320 320
MIXED-AIR FILTERS Quantity...Size (in.) Standard 10...20 x 24 x 2 16...20 x 24 x 2 16...20 x 24 x 2
Pleated 5...20 x 20 x 4 5...20 x 24 x 4
8...20 x 20 x 4 8...20 x 24 x 4
8...20 x 20 x 4 8...20 x 24 x 4
OUTDOOR-AIR FILTERS
Quantity...Size (in.) 8...16 x 25 x 2 12...16 x 25 x 2 12...16 x 25 x 2 4...20 x 25 x 2 6...20 x 25 x 2 6...20 x 25 x 2
POWER EXHAUST Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan Housing
Motor, Quantity...Hp 4...1 6...1 6...1 Fan, Diameter...Width (in.) 11 x 10 11 x 10 11 x 10
Al Aluminum Cu Copper
17
50 A
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27 70
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97
21 31
87 .7
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77 21
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