Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28 Installation And Service Instructions Manual
48PG20-28
Single Package Rooftop Units
Electric Cooling/Gas Heating with
Electromechanical Controls and PURON® (R-410A) Refrigerant
Installation, Start-Up and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ..........................1,2
INSTALLATION ......................................2-17
Step 1 — Provide Unit Support .........................2
• ROOF CURB
• ALTERNATE UNIT SUPPORT
• SLAB MOUNT
Step 2 — Remove Shipping Rails .......................2
Step 3 — Rig and Place Unit ............................2
• POSITIONING
• ROOF MOUNT
• INSTALLATION ONTO CURB
Step 4 — Field Fabricate Ductwork .....................9
Step 5 — Make Unit Duct Connections..................9
• VERTICAL CONFIGURATION
• HORIZONTAL APPLICATIONS
Step 6 — Install Flue Hood and Inlet Hood ............ 10
Step 7 — Trap Condensate Drain ..................... 10
Step 8 — Install Gas Piping ........................... 10
Step 9 — Make Electrical Connections.................11
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 10 — Install Outdoor-Air Hood................... 12
• MANUAL DAMPER ASSEMBLY
Step 11 — Position Optional Power
Exhaust or Barometric Relief Damper Hood ......... 16
Step 12 — Non-Fused Disconnect .................... 16
Step 13 — Install All Accessories..................... 16
PRE-START-UP ....................................... 18
START-UP...........................................18-45
Unit Preparation ...................................... 18
Compressor Mounting................................ 18
Refrigerant Service Ports ............................. 18
Crankcase Heater(s) .................................. 18
Compressor Rotation................................. 18
Internal Wiring........................................ 18
Subcooler Heat Exchanger (SHX) ..................... 18
Evaporator Fan ....................................... 18
Condenser Fans and Motors.......................... 19
Return-Air Filters ..................................... 19
Outdoor-Air Inlet Screens............................. 19
Gas Heat.............................................. 19
Optional EconoMi$er IV............................... 39
Operating Sequence .................................. 44
SERVICE............................................46-57
Cleaning .............................................. 46
Lubrication ........................................... 47
Manual Outdoor Air Damper .......................... 48
Economizer Adjustment .............................. 48
Evaporator Fan Service and Replacement ............ 48
Evaporator Fan Performance Adjustment............. 48
Evaporator Fan Belt Tension Adjustment ............. 48
Condenser Fan Adjustment........................... 49
Verify Sensor Performance ........................... 49
Economizer Operation During Power Failure.......... 49
Evacuation ........................................... 49
Refrigerant Charge ................................... 50
Gas Valve Adjustment ................................ 50
High Altitude.......................................... 51
Main Burners ......................................... 51
Filter Drier ............................................ 52
Protective Devices.................................... 52
Relief Devices ........................................ 52
Control Circuit, 24-V .................................. 52
Page
Replacement Parts.................................... 52
Diagnostic LEDs ...................................... 52
TROUBLESHOOTING .............................. 57-61
Unit Troubleshooting.................................. 57
EconoMi$er IV Troubleshooting....................... 60
Phase Loss Protection ................................ 61
UNIT START-UP CHECKLIST ........................CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, 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 personnel. When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers 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.
Puron (R-410A) refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron refrigerant equipment.
If service equipment is not rated for Puron refrigerant,
equipment damage or personal injury may result.
1. Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, personal
injury, or loss of life. Refer to the User’s Information
Manual provided with this unit for more details.
2. Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire
department.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Ta b 1 a 6 a
PC 111 Catalog No. 534-80211 Printed in U.S.A. Form 48PG-10SI Pg 1 9-05 Replaces: New
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure
testing field-supplied gas piping at pressures of 0.5 psig or
less, a unit connected to such piping must be isolated by
closing the manual gas valve(s).
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the units will automatically lock the
compressor out of operation. Manual reset will be required
to restart the compressor.
INSTALLATION
Step 1 — Provide Unit Support
ROOF CURB — Assemble or install accessory roof curb in
accordance with instructions shipped with this accessory. See
Fig. 1. Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be installed to roof curb before
unit is set in place. Ductwork must be attached to curb and not
to the unit. Curb must be level. This is necessary to permit unit
drain to function properly. Unit leveling tolerance is ±
1
/16in.
per linear ft in any direction. 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. Carrier roof curb accessories are for flat roofs or slab mounting.
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. Improperly applied gasket can also
result in air leaks and poor unit performance. Do not slide
unit to position on roof curb.
ALTERNATE UNIT SUPPORT — When a curb cannot be
used, install unit on a noncombustible surface. Support unit
with sleepers, using unit curb support area. If sleepers cannot
be used, support long sides of unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.
SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 6 in. beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to
prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
Step 2 — Remove Shipping Rails — Remove ship-
ping rails prior to lowering unit onto roof curb. See Fig. 2. The
rails are attached to the unit at both the return end and condenser end. Remove the screws from both ends of each rail. Be
careful not to drop the rails onto any surface that could be
damaged. Discard the rails. It is important to replace the screws
into the unit to avoid any air or water leakage.
Step 3 — Rig and Place Unit — Inspect unit for trans-
portation damage. See Tables 1-3 for physical data. File any
claim with transportation agency.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck. Damage to unit may
result.
Do not drop unit; keep upright. 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 ±
Fig. 3 for additional information. Unit rigging weight is shown
in Fig. 3.
Four lifting holes are provided in the unit base rails as
shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Maintain clearance, per Fig. 4, 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 air
inlets near exhaust vents or other sources of contaminated air.
For proper unit operation, adequate combustion and ventilation
air must be provided in accordance with Section 5.3 (Air for
Combustion and Ventilation) of the National Fuel Gas Code,
ANSI Z223.1 (American National Standards Institute).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Locate mechanical draft system flue assembly at least 4 ft
from any opening through which combustion products could
enter the building, and at least 4 ft from any adjacent building
(or per local codes). When unit is located adjacent to public
walkways, flue assembly must be at least 7 ft above grade.
ROOF MOUNT — Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.
INSTALLATION ONTO CURB — The 48PG units are designed to fit on either the accessory full perimeter curb. Correct
placement of the unit onto the curb is critical to operating performance. To aid in correct positioning,
ing holes have been added to the unit base rails. When placing
the unit, these holes should line up with the roof curb edge as
shown in Fig. 5 and 6, to assure proper duct opening alignment.
For placement on the roof curb, use the alignment holes located
approximately 2-in. from the end of the base rail on the return
end of the unit. See labels on the side of the unit for more
details.
Do not slide unit to position it when it is sitting on the curb.
Curb gasketing material may be damaged and leaks may
result.
1
/16in. per linear ft in any direction. See
3
/8-in. diameter locat-
Do not allow the shipping rail to drop on the roof surface.
Damage to the roof surface may result.
2
Fig. 1 — Roof Curb Details
3
SHIPPING RAILS
Fig. 2 — Shipping Rail Removal
MAX
UNIT SIZE
PG20
PG24
PG28
DOES NOT INCLUDE ERV ( ENERGY RECOVERY VENTILATOR) OPTION.
WEIGHT
CENTER OF GRAVITY ( IN.)
(LB) *
3825
4075
4300
X
66.5
66.5
70.5
Y
36.7 31.4
37.0
31.8
37.0
35.2
Z
NOTES:
1. Add 150 lb (68 kg) for domestic crating.
2. See label for unit location on roof curb.
Fig. 3 — Rigging Details
4
Fig. 4 — Base Unit Dimensions
5
Table 1 — Physical Data
UNIT 48PG 20 24 28
VO LTAGE 208/230 and 460 575 208/230 and 460 575 208/230 and 460 575
NOMINAL CAPACITY (Tons) 18 18 20 20 25 25
OPERATING WEIGHT (lb)
48 Series (Low Heat) Al/Al* 2480 2480 2588 2588 2773 2773
COMPRESSOR Fully Hermetic Scroll
Quantity 222233
Number of Refrigerant Circuits 222222
Oil (ounces) Comp A1, A2, B1 85, NA, 85 85, NA, 85 85, NA, 85 85, NA, 85 85, 85, 85 85, 85, 85
REFRIGERANT TYPE Puron® Refrigerant (R-410A)
Expansion Device TXV TXV TXV TXV TXV TXV
Change Type
Operating Charge (lb)
Circuit A 25.3 25.3 35.7 35.7 49.3 49.3
Circuit B 25.3 25.3 33.5 33.5 24.3 24.3
REFRIGERANT SUBCOOLER
Heat Exch anger Size B15Hx26x26 B15Hx26x26 B15Hx26x26 B15Hx26x26 B15Hx26x36 B15Hx26x36
Expansion Device TXV TXV TXV TXV TXV TXV
CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fins
Rows...Fins/inch 2...17 2...17 3...17 3...17 3...17 3...17
Quantity 223333
Length of Tube Sheets (in.) 80.3 80.3 80.3 80.3 80.3 80.3
Width (in.) 60 60 60 60 60 60
Total Face area (sq. ft) 33.46 33.46 33.46 33.46 33.46 33.46
CONDENSER FAN Propeller
Nominal Cfm (Total, all fans) 14,000 14,000 21,000 21,000 21,000 21,000
Quantity...Diameter (in.) 4...22 4...22 6...22 6...22 6...22 6...22
Motor Hp...Rpm
Watts input (Total) 1400 1400 2100 2100 2100 2100
EVAPORATOR COIL Enhanced Copper Tubes, Face Split, Aluminum Double-Wavy Fins
Rows...Fins/inch 4...15 4...15 4...15 4...15 4...15 4...15
Length of Tube Sheets (in.) 69.4 69.4 69.4 69.4 69.4 69.4
Width (in.) 48 48 48 48 60 60
Total Face area (sq ft) 23.13 23.13 23.13 23.13 28.92 28.92
EVAPORATOR FAN Centrifugal, Belt Type
Quantity...Size (in.) 2...15 x 11 2...15 x 11 2...15 x 11 2...15 x 11 2...15 x 11 2...15 x 11
Typ e D riv e Belt Belt Belt Belt Belt Belt
Nominal Cfm 7000 7000 8000 8000 10,000 10,000
Motor Bearing Type Ball Ball Ball Ball Ball Ball
Maximum Allowable Fan Rpm 1400 1400 1400 1400 1400 1400
FURNACE SECTION
Rollout Switch Cutout Temp (F) Vertical 225 225 225 225 225 225
Burner Orifice Diameter (in. ...drill size) 0.136...29 0.136...29 0.136...29 0.136...29 0.136...29 0.136...29
Gas Natural Natural Natural Natural Natural Natural
Thermostat Heat Anticipator Setting
Stage 1 (amps) 0.98 0.98 0.98 0.98 0.98 0.98
Stage 2 (amps) 0.44 0.44 0.44 0.44 0.44 0.44
Gas Input (Btuh) HIGH HEAT Stage 1 317,000 317,000 317,000 317,000 317,000 317,000
Efficiency (Steady State) % Vertical 82 82 82 82 82 82
Temperature Rise Range 25-55 25-55 25-55 25-55 25-55 25-55
Gas Input (Btuh) MEDIUM HEAT Stage 1 281,000 281,000 281,000 281,000 281,000 281,000
Efficiency (Steady State) % Vertical 81 81 81 81 81 81
Temperature Rise Range 25-55 25-55 25-55 25-55 25-55 25-55
Gas Input (Btuh) LOW HEAT Stage 1 199,000 199,000 199,000 199,000 199,000 199,000
Efficiency (Steady State) % Vertical 82 82 82 82 82 82
Temperature Rise Range 15-45 15-45 15-45 15-45 15-45 15-45
Manifold Pr essure
Natural Gas (in. wg) Vertical 3.00 3.00 3.00 3.00 3.00 3.00
Natural Gas (in. wg) Horizontal 2.95 2.95 2.95 2.95 2.95 2.95
Gas Valve Quantity 111111
Gas Valve Pressure Range (in. wg) 5.5-13.0 5.5-13.0 5.5-13.0 5.5-13.0 5.5-13.0 5.5-13.0
Min-Max Allowable (psig) .235-.469 .235-.469 .235-.469 .235-.469 .235-.469 .235-.469
Field Gas Connection Size (in...FPT)
HIGH-PRESSURE SWITCHES (psig)
Cutout 630±10 630±10 630±10 630±10 630±10 630±10
Reset (Auto) 505±20 505±20 505±20 505±20 505±20 505±20
OUTDOOR AIR INLET SCREENS
Quantity...Size (in.) 3...20 x 25 3...20 x 25 3...20 x 25 3...20 x 25 3...20 x 25 3...20 x 25
RETURN-AIR FILTERS
Quantity...Size (in.) 9...16 x 25 x 2 9...16 x 25 x 2 9...16 x 25 x 2 9...16 x 25 x 2 9...20 x 25 x 2 9...20 x 25 x 2
Stage 2 400,000 400,000 400,000 400,000 400,000 400,000
Stage 2 365,000 365,000 365,000 365,000 365,000 365,000
Stage 2 250,000 250,000 250,000 250,000 250,000 250,000
LEGEND
TXV — Thermostatic Expansion Valve
*Aluminum evaporator coil/aluminum condenser coil.
1
/4...1100
3
/
1
/4...1100
3
4
/
4
1
/4...1100
3
/
1
/4...1100
3
4
/
4
1
/4...1100
3
/
1
/4...1100
3
4
/
4
6
Table 2 — Fan Motor and Drive Data — Vertical Supply/Return
48PG
LOW RANGE
Motor Hp 3.753.7555
Motor Nominal Rpm 1750 1750 1750 1750 1750 1750
Maximum Continuous Bhp 4.26 5.75 4.26 5.75 5.75 5.75
Maximum Continuous Watts 3174 4290 3174 4290 4290 4290
Motor Frame Size 56HZ S184T 56HZ S184T S184T S184T
Motor Shaft Diameter (in.)
Fan Rpm Range 685-939 751-954 685-939 751-954 687-873 687-873
Motor Pulley Min. Pitch Diameter (in.) 2.7 3.7 2.7 3.7 3.7 3.7
Motor Pulley Max. Pitch Diameter (in.) 3.7 4.7 3.7 4.7 4.7 4.7
Blower Pulley Pitch Diameter (in.) 6.8 8.6 6.8 8.6 9.4 9.4
Blower Pulley Shaft Diameter (in.) 1
Blower Pulley Type FixedFixedFixedFixedFixedFixed
Pulley Center Line Distance (in.) 11.293-13.544 9.81-13.055 11.293-13.544 9.81-13.055 9.81-13.055 9.81-13.055
Belt, Quantity...Type...Length (in.) 1...BX38...39.8 1...BX40...41.8 1...BX38...39.8 1...BX40...41.8 1...BX41...42.8 1...BX41...42.8
Speed Change Per Turn — Moveable Pulley (rpm) 42 34 42 34 31 31
Moveable Pulley Maximum Full Turns 666666
Factory Speed Setting (rpm) 812 853 812 853 780 780
MID-LOW RANGE
Motor Hp 555555
Motor Nominal Rpm 1750 1750 1750 1750 1750 1750
Maximum Continuous Bhp 5.75 5.75 5.75 5.75 5.75 5.75
Maximum Continuous Watts 4290 4290 4290 4290 4290 4290
Motor Frame Size S184T S184T S184T S184T S184T S184T
Motor Shaft Diameter (in.) 1
Fan Rpm Range 949-1206 949-1206 949-1206 949-1206 805-1007 805-1007
Motor Pulley Min. Pitch Diameter (in.) 3.7 3.7 3.7 3.7 4.8 4.8
Motor Pulley Max. Pitch Diameter (in.) 4.7 4.7 4.7 4.7 6 6
Blower Pulley Pitch Diameter (in.) 6.8 6.8 6.8 6.8 10.4 10.4
Blower Pulley Shaft Diameter (in.) 1
Blower Pulley Type FixedFixedFixedFixedFixedFixed
Pulley Center Line Distance (in.) 9.81-13.055 9.81-13.055 9.81-13.055 9.81-13.055 9.81-13.055 9.81-13.055
Belt, Quantity...Type...Length (in.) 1...BX38...39.8 1...BX38...39.8 1...BX38...39.8 1...BX38...39.8 1...BX45...46.8 1...BX45...46.8
Speed Change Per Turn — Moveable Pulley (rpm) 43 43 43 43 34 34
Moveable Pulley Maximum Full Turns 666666
Factory Speed Setting (rpm) 1078 1078 1178 1078 906 906
MID-HIGH RANGE
Motor Hp 7.5 7.5 7.5 7.5 7.5 7.5
Motor Nominal Rpm 1750 1750 1750 1750 1750 1750
Maximum Continuous Bhp 8.63 8.63 8.63 8.63 8.63 8.63
Maximum Continuous Watts 6434 6434 6434 6434 6434 6434
Motor Frame Size S213T S213T S213T S213T S213T S213T
Motor Shaft Diameter (in.) 1
Fan Rpm Range 941-1176 941-1176 941-1176 941-1176 941-1176 941-1176
Motor Pulley Min. Pitch Diameter (in.) 4.8 4.8 4.8 4.8 4.8 4.8
Motor Pulley Max. Pitch Diameter (in.) 6.0 6.0 6.0 6.0 6.0 6.0
Blower Pulley Pitch Diameter (in.) 8.9 8.9 8.9 8.9 8.9 8.9
Blower Pulley Shaft Diameter (in.) 1
Blower Pulley Type FixedFixedFixedFixedFixedFixed
Pulley Center Line Distance (in.) 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179
Belt, Quantity...Type...Length (in.) 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8
Speed Change Per Turn —
Moveable Pulley (rpm)
Moveable Pulley Maximum Full Turns 666666
Factory Speed Setting (rpm) 1059 1059 1059 1059 1059 1059
HIGH RANGE
Motor Hp 10 10 10 10 10 10
Motor Nominal Rpm 1750 1750 1750 1750 1750 1750
Maximum Continuous Bhp 11.50 11.50 11.50 11.50 11.50 11.50
Maximum Continuous Watts 8579 8579 8579 8579 8579 8579
Motor Frame Size S215T S215T S215T S215T S215T S215T
Motor Shaft Diameter (in.) 1
Fan Rpm Range 1014-1297 1014-1297 1014-1297 1014-1297 1014-1297 1014-1297
Motor Pulley Min. Pitch Diameter (in.) 4.3 4.3 4.3 4.3 4.3 4.3
Motor Pulley Max. Pitch Diameter (in.) 5.5 5.5 5.5 5.5 5.5 5.5
Blower Pulley Pitch Diameter (in.) 7.4 7.4 7.4 7.4 7.4 7.4
Blower Pulley Shaft Diameter (in.) 1
Blower Pulley Type FixedFixedFixedFixedFixedFixed
Pulley Center Line Distance (in.) 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179
Belt, Quantity...Type...Length (in.) 2...BX38...39.8 2...BX38...39.8 2...BX38...39.8 2...BX38...39.8 2...BX38..39.8 2...BX38...39.8
Speed Change Per Turn — Moveable Pulley (rpm) 47 47 47 47 47 47
Moveable Pulley Maximum Full Turns 666666
Factory Speed Setting (rpm) 1156 1156 1156 1156 1156 1156
208/230 and 460 575 208/230 and 460 575 208/230 and 460 575
20 24 28
7
/
8
3
/
16
1
/
8
3
/
16
3
/
8
3
/
16
13/
13/
13/
11/
11/
13/
8
16
8
16
8
16
7
/
8
13/
16
11/
8
13/
16
13/
8
13/
16
13/
13/
13/
11/
11/
13/
13/
13/
13/
11/
11/
13/
8
16
8
16
8
16
8
16
8
16
8
16
11/
13/
11/
13/
13/
13/
39 39 39 39 39 39
3
/
8
3
/
16
13/
13/
8
16
13/
8
13/
16
13/
13/
13/
13/
8
16
8
16
13/
13/
8
16
8
16
8
16
8
16
7
Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return
48PG
LOW RANGE
Motor Hp ———— 5 5
Motor Nominal Rpm — — — — 1750 1750
Maximum Continuous Bhp ————5.755.75
Maximum Continuous Watts — — — — 4290 4290
Motor Frame Size — — — — S184T S184T
Motor Shaft Diameter (in.) ————1
Fan Rpm Range — — — — 687-873 687-873
Motor Pulley Min. Pitch Diameter (in.) ————3.73.7
Motor Pulley Max. Pitch Diameter (in.) ————4.74.7
Blower Pulley Pitch Diameter (in.) ————9.49.4
Blower Pulley Shaft Diameter (in.) ————1
Blower Pulley Type ————FixedFixed
Pulley Center Line Distance (in.) — — — — 9.81-13.055 9.81-13.055
Belt, Quantity...Type...Length (in.) — — — — 1...BX41...42.8 1...BX41...42.8
Speed Change Per Turn —
Moveable Pulley (rpm)
Moveable Pulley Maximum Full Turns ———— 6 6
Factory Speed Setting (rpm) ————780780
MID-LOW RANGE
Motor Hp 3.753.75 5 5
Motor Nominal Rpm 1750 1750 1750 1750 1750 1750
Maximum Continuous Bhp 4.26 5.75 4.26 5.75 5.75 5.75
Maximum Continuous Watts 3174 4290 3174 4290 4290 4290
Motor Frame Size 56HZ S184T 56HZ S184T S184T S184T
Motor Shaft Diameter (in.)
Fan Rpm Range 896-1227 873-1108 896-1227 873-1108 805-1007 805-1007
Motor Pulley Min. Pitch Diameter (in.) 2.7 3.7 2.7 3.7 4.8 4.8
Motor Pulley Max. Pitch Diameter (in.) 3.7 4.7 3.7 4.7 6.0 6.0
Blower Pulley Pitch Diameter (in.) 5.2 7.4 5.2 7.4 10.4 10.4
Blower Pulley Shaft Diameter (in.) 1
Blower Pulley Type Fixed Fixed Fixed Fixed Fixed Fixed
Pulley Center Line Distance (in.) 11.293-13.544 9.81-13.055 11.293-13.544 9.81-13.055 9.81-13.055 9.81-13.055
Belt, Quantity...Type...Length (in.) 1...BX35...36.8 1...BX38...39.8 1...BX35...36.8 1...BX38...39.8 1...BX45...46.8 1...BX45...46.8
Speed Change Per Turn —
Moveable Pulley (rpm)
Moveable Pulley Maximum Full Turns 666666
Factory Speed Setting (rpm) 1062 991 1062 991 906 906
MID-HIGH RANGE
Motor Hp 55557.57.5
Motor Nominal Rpm 1750 1750 1750 1750 1750 1750
Maximum Continuous Bhp 5.75 5.75 5.75 5.75 8.63 8.63
Maximum Continuous Watts 4290 4290 4290 4290 6434 6434
Motor Frame Size S184T S184T S184T S184T S213T S213T
Motor Shaft Diameter (in.) 1
Fan Rpm Range 1113-1414 1113-1414 1113-1414 1113-1414 941-1176 941-1176
Motor Pulley Min. Pitch Diameter (in.) 3.7 3.7 3.7 3.7 4.8 4.8
Motor Pulley Max. Pitch Diameter (in.) 4.7 4.7 4.7 4.7 6.0 6.0
Blower Pulley Pitch Diameter (in.) 5.8 5.8 5.8 5.8 8.9 8.9
Blower Pulley Shaft Diameter (in.) 1
Blower Pulley Type Fixed Fixed Fixed Fixed Fixed Fixed
Pulley Center Line Distance (in.) 9.81-13.055 9.81-13.055 9.81-13.055 9.81-13.055 9.025-12.179 9.025-12.179
Belt, Quantity...Type...Length (in.) 1...BX35...36.8 1...BX35...36.8 1...BX35...36.8 1...BX35...36.8 1...BX42...43.8 1...BX42...43.8
Speed Change Per Turn —
Moveable Pulley (rpm)
Moveable Pulley Maximum Full Turns 666666
Factory Speed Setting (rpm) 1264 1264 1264 1264 1059 1059
HIGH RANGE
Motor Hp 7.5 7.5 7.5 7.5 10 10
Motor Nominal Rpm 1750 1750 1750 1750 1750 1750
Maximum Continuous Bhp 8.63 8.63 8.63 8.63 11.50 11.50
Maximum Continuous Watts 6434 6434 6434 6434 8579 8579
Motor Frame Size S213T S213T S213T S213T S215T S215T
Motor Shaft Diameter (in.) 1
Fan Rpm Range 1096-1339 1096-1339 1096-1339 1096-1339 1014-1297 1014-1297
Motor Pulley Min. Pitch Diameter (in.) 5.4 5.4 5.4 5.4 4.3 4.3
Motor Pulley Max. Pitch Diameter (in.) 6.6 6.6 6.6 6.6 5.5 5.5
Blower Pulley Pitch Diameter (in.) 8.6 8.6 8.6 8.6 7.4 7.4
Blower Pulley Shaft Diameter (in.) 1
Blower Pulley Type Fixed Fixed Fixed Fixed Fixed Fixed
Pulley Center Line Distance (in.) 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179
Belt, Quantity...Type...Length (in.) 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX38...39.8 1...BX38...39.8
Speed Change Per Turn —
Moveable Pulley (rpm)
Moveable Pulley Maximum Full Turns 666666
Factory Speed Setting (rpm) 1218 1218 1218 1218 1156 1156
208/230 and 460 575 208/230 and 460 575 208/230 and 460 575
20 24 28
1
/
8
3
/
16
13/
11/
8
16
————3131
7
/
8
3
/
16
11/
8
13/
16
7
/
8
13/
16
13/
11/
13/
11/
8
16
8
16
13/
11/
8
16
55 39 55 39 34 34
1
/
8
3
/
16
11/
8
13/
16
11/
8
13/
16
13/
11/
13/
13/
8
16
8
16
13/
13/
8
16
50 50 50 50 39 39
3
/
8
3
/
16
13/
8
13/
16
13/
8
13/
16
13/
13/
13/
13/
8
16
8
16
13/
13/
8
16
41 41 41 41 47 47
8
(IN BASE RAIL)
EDGE FLANGE
ALIGNMENT
HOLES FOR
CURB-BOTH
SIDES
ALIGNMENT
HOLE
ALIGNMENT
HOLE SHOULD
LINE UP WITH
ROOF CURB
EDGE FLANGE
Fig. 5 — Alignment Hole Details
RETURN
OPENING
CURB
RETURN
OPENING
ROOF CURB
SUPPLY
OPENING
CURB
SUPPLY
OPENING
Fig. 6 — Alignment Hole Location
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90 degree
turn in the return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then
a grille of sufficient strength and density should be installed
to prevent objects from falling into the conditioned space.
HORIZONTAL APPLICATIONS — Horizontal units are
shipped with outer panels that allow for side by side horizontal
duct connections. If specified during ordering, the unit will be
shipped with the vertical duct openings blocked off from the
factory, ready for side supply installation. If the horizontal
supply/return option was not specified at time of ordering the
unit, a field-installed accessory kit is required to convert the
vertical unit into a horizontal supply configuration.
Installation of the duct block-off covers should be completed prior to placing the unit unless sufficient side clearance is
available. A minimum of 66 in. is required between the unit
and any obstruction to install the duct block-off covers. Side
supply duct dimensions and locations are shown on Fig. 4.
Install ductwork to horizontal duct flange connections on side
of unit.
ECONOMIZER
Step 4 — Field Fabricate Ductwork — On vertical
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 secured 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.
A minimum clearance is not required around ductwork.
Cabinet return-air static shall not exceed –0.35 in. wg with
economizer or 0.45 in. wg without economizer.
These units are designed for a minimum continuous returnair temperature in heating of 50 F (dry bulb), or an intermittent
operation down to 45 F (dry bulb), such as when used with a
night set-back thermostat.
To operate at lower return-air temperatures, a field-supplied
outdoor-air temperature control must be used to initiate both
stages of heat when the temperature is below 45 F. Indoor comfort may be compromised when these lower air temperatures
are used with insufficient heating temperature rise.
Step 5 — Make Unit Duct Connections
VERTICAL CONFIGURATION — Unit is shipped for vertical supply and return duct connections. Ductwork openings
are shown in Fig. 1 and 4. Duct connections for vertical
configuration are shown in Fig. 7. Field-fabricated concentric
ductwork may be connected as shown in Fig. 8 and 9. The unit
is designed to attach the ductwork to the roof curb. Do not
attach duct directly to the unit.
SEE
NOTE
AIR
IN
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
SEE
NOTE
HEAT
EXCHANGER
AIR
OUT
Fig. 7 — Air Distribution — Vertical Supply/Return
ECONOMIZER
HEAT
AIR OUT
SEE
NOTE
EXCHANGER
SEE
NOTE
AIR OUT
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
AIR IN
Fig. 8 — Air Distribution — Concentric Duct
9
NOTE: Dimensions A, A′,B,andB′ are obtained from field-supplied
ceiling diffuser.
Shaded areas indicate block-off pans.
Fig. 9 — Concentric Duct Details
Step 6 — Install Flue Hood and Inlet Hood —
Flue hood (smaller hood), inlet hood (larger hood), and screens
are shipped inside the unit in the fan section. To install, remove
the heat panel. The flue hood is attached to the heat section
panel from the outside using the screws provided. See Fig. 10.
The inlet hood is installed by inserting the hood through the
back of the heat panel. Attach the hood by inserting the screws
provided through the clearance holes in the heat panel and into
the intake hood.
Install the screens into both hoods using the screws and retaining nuts provided with the unit.
Attach the cover of the observation hole on the intake hood
and then replace the heat panel onto the unit to complete the installation.
NOTE: When properly installed, the flue hood will line up
with the combustion fan housing. See Fig. 11.
Step 7 — Trap Condensate Drain — See Fig. 12
for drain location. One3/4-in. half coupling is provided outside
unit evaporator section for condensate drain connection. A trap
at least 4-in. deep must be used. See Fig. 13.
All units must have an external trap for condensate drainage. Install a trap at least 4 in. deep and protect against freezeup. If drain line is installed downstream from the external trap,
pitch the line away from the unit at 1 in. per 10 ft of run. Do not
use a pipe size smaller than the unit connection.
Step 8 — Install Gas Piping — Unit is equipped for
use with natural gas. Refer to local building codes, or in the
absence of local codes, to ANSI Z223.1-latest year and
addendum Z223.1A-latest year entitled NFGC. In Canada,
installation must be in accordance with the CAN1.B149.1 and
CAN1.B149.2 installation codes for gas burning appliances.
Support gas piping. For example, a
have one field-fabricated support beam every 8 ft. Therefore,
an 18-ft long gas pipe would have a minimum of 3 support
beams.
Install field-supplied manual gas shutoff valve with a
NPT pressure tap for test gage connection at unit. The pressure
tap is located on the gas manifold, adjacent to the gas valve.
Field gas piping must include sediment trap and union. See
Fig. 14.
3
/4-in. gas pipe must
1
/8-in.
FLUE HOOD
INLET HOOD
Fig. 10 — Flue and Inlet Hood Locations
COMBUSTION
FAN HOUSING
HEAT
EXCHANGER
SECTION
INDUCED-DRAFT
MOTOR
MAIN BURNER
SECTION
Fig. 11 — Combustion Fan Housing Location
10
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing.
IMPORTANT: Natural gas pressure at unit gas connection
must not be less than 5.5 in. wg or greater than 13.0 in. wg.
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas connection.
Fig. 12 — Condensate Drain Details
Step 9 — Make Electrical Connections
FIELD POWER SUPPLY — Unit is factory wired for voltage shown on unit nameplate. Be sure to check for correct
voltage.
When installing units, provide disconnect per NEC (National Electrical Code) of adequate size (MOCP [Maximum Overcurrent protection] of unit is on the informative plate). See
Tables 4A and 4B. All field wiring must comply with NEC and
local codes. Size wire based on MCA (Minimum Circuit
Amps) on the unit informative plate. See Fig. 15 for power
wiring connection to the unit power terminal block and equipment ground.
Route power and ground lines through control box end panel or unit basepan (see Fig. 4) to connections as shown on unit
wiring diagram and Fig. 15.
The correct power phasing is critical to the operation of the
scroll compressors. An incorrect phasing will result in
compressor shutdown on thermal overload and possible
damage to compressor. Should this occur, power phase correction must be made to the incoming power.
Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if
an electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA (American
National Standards Institute/National Fire Protection Association), latest edition, and local electrical codes. Do not
use gas piping as an electrical ground. Failure to follow
this warning could result in the installer being liable for
personal injury of others.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. trap is recommended.
Fig. 13 — Condensate Drain Piping Details
Field wiring must conform to temperature limitations for
type “T” wire. All field wiring must comply with NEC and
local requirements.
Operating voltage to compressor must be within voltage
range indicated on unit nameplate. On 3-phase units, voltages
between phases must be balanced within 2%.
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may cause
damage to electrical components.
FIELD CONTROL WIRING — Unit can be controlled with
either a Carrier-approved accessory thermostat. Install thermostat according to the installation instructions included with
accessory. Locate thermostat assembly on a solid interior wall
in the conditioned space to sense average temperature.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals through conduit into unit to lowvoltage connections as shown on unit label wiring diagram and
in Fig. 16.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C Minimum). All
wire larger than no. 18 AWG cannot be directly connected at
the thermostat and will require a junction box and splice at the
thermostat.
Fig. 14 — Field Gas Piping
11
LEGEND
EQUIP — Equipment
GND — Ground
NEC — National Electrical Code
TB — Terminal Board
NOTE: The maximum wire size for TB1 is 2/0.
Fig. 15 — Field Power Wiring Connections
THERMOSTAT ASSEMBLY
REMOVABLE JUMPER
L
X
8
7
TB2J11
RH
Y1 Y2
RC
R
1
Y1 Y2
2
W1 W2 G C
W1 W2 G C X
45
3
6
Fig. 16 — Field Control Thermostat Wiring
Set heat anticipator settings as follows:
VO LTAGE
All 0.98 0.44
STAGE 1
(W1) ON
STAGE 1 AND 2
(W1 AND W2) ON
Settings may be changed slightly to provide a greater degree
of comfort for a particular installation.
Step 10 — Install Outdoor Air Hood — Per-
form the following procedure to install the outdoor-air hood on
units equipped with an economizer, two-position damper, or
manual outdoor air damper:
1. Remove blank panel from return end of unit (hood section). Save the screws. See Fig. 17 for shipping location
of components.
2. Hood sides are fastened to sides of outdoor air opening.
Remove the hood sides and save the screws (3 each side).
3. Remove the bracket holding the bottom half of the hood
in the shipping position. Remove the hood bottom half
and filters (or manual dampers on units so equipped)
from outdoor section.
NOTE: On units without economizers, the components
are attached to the unit basepan. To access the components, remove the panel below the outdoor air intake
section.
4. Remove inner filter track from shipping position in outdoor section. Position inner filter track so the track is
facing outward from the unit. Install the filter track with 4
screws provided.
5. Apply seal strip (provided) to back flange of both hood
sides where hood side connects to the unit back panel.
See Fig. 18.
6. Apply seal strip (provided) to top flange of both hood
sides where hood sides connect to the hood top panels.
See Fig. 18.
7. Install hood sides to the back panels using the screws
from Step 2. The sloped flanges point outward. The drip
edges of the side panels should face outward as well. The
filter guides to the hood sides. The flanges of the filter
guides should face inward to hold the filters in place.
See Fig. 18.
8. Apply seal strip along the entire length of the bottom
flange of the hood top. See Fig. 18.
9. Install the bottom part of the hood top using 4 screws provided. See Fig. 18.
10. Remove the packaging from filters (3) and install into the
filter tracks. Slide the filters to the sides then place the last
filter into the center of the filter track.
NOTE: For units with manual dampers, replace the end filters
with the manual dampers. Install the filter in the center
between the manual dampers.
11. Install the filter retainer track along the bottom edge of
the outdoor air hood using 4 screws provided. See
Fig. 18.
12. Install top section of the outdoor air hood using 9 screws
provided. See Fig. 18. See Fig. 19 for a picture of the assembled outdoor air hood.
NOTE: For filter removal, remove the four screws holding the
filter retainer. The filters can then be removed, cleaned, or
replaced. Install the filters by reversing the procedure.
MANUAL DAMPER ASSEMBLY — For units equipped
with manual dampers, the assembly process is similar to the
outdoor air hood for units with economizers. There are two
slide dampers shipped with the unit to allow for manual setting
of the outside air volume. When assembling the hood, place
one of the manual slide dampers in each of the end positions
and the remaining filter in the center position. The manual
dampers can then be moved to the appropriate position and
then locked into place using the screws mounted in the adjustment slots. See Fig. 20.
HOOD TOP
(TOP HALF)
HOOD
SIDE
RETURN AIR
SECTION
HOOD
SIDE
HOOD TOP
(BOTTOM HALF)
Fig. 17 — Outdoor-Air Hood Component
Shipping Location
12
Table 4A — Electrical Data (Units Without Optional Powered Convenience Outlet)
UNIT
NOMINAL
SIZE
VO LTAGE
48HG
(3 Ph, 60 Hz)
208/230 187 253 28.2 208 28.2 208 — — 4 0.25 1.5
20
208/230 187 253 32.1 240 32.1 240 — — 6 0.25 1.5
24
208/230 187 253 28.2 208 28.2 208 28.2 208 6 0.25 1.5
28
See Legend and Notes on page 15.
VO LTAGE
RANGE
Min Max RLA LRA RLA LRA RLA LRA Qty Hp
460 414 506 15.4 104 15.4 104 — — 4 0.25 0.7
575 518 633 12.8 83 12.8 83 — — 4 0.25 0.7
460 414 506 15.4 110 15.4 110 — — 6 0.25 0.7
575 518 633 12.8 88 12.8 88 — — 6 0.25 0.7
460 414 506 15.4 104 15.4 104 15.4 104 6 0.25 0.7
575 518 633 12.8 83 12.8 83 12.8 83 6 0.25 0.7
COMPRESSOR
No. 1 No. 2 No. 3
OFM IFM
FLA
Hp FLA Qty Hp
(ea)
3.7 10.6/ 9.6
5 16.7/15.2
7.5 24.2/22
10 30.8/28
3.7 4.8
57.6
7.5 11
10 14
56.1
7.5 9
10 11
3.7 10.6/ 9.6
5 16.7/15.2
7.5 24.2/22
10 30.8/28
3.7 4.8
57.6
7.5 11
10 14
56.1
7.5 9
10 11
5 16.7/15.2
7.5 24.2/22
10 30.8/28
57.6
7.5 11
10 14
56.1
7.5 9
10 11
POWER
EXHAUST
—— —
2 1 5.9 92/ 91 100/100 92/ 92 100/100 98/ 96
— — — 86/ 85 100/100 86/ 86 100/100 91/ 89
2 1 5.9 98/ 96 100/100 98/ 98 100/100 105/103
— — — 94/ 91 100/100 94/ 94 100/100 100/ 97
2 1 5.9 105/103 125/125 105/105 125/125 113/111
— — — 101/ 97 125/100 101/101 125/125 107/104
2 1 5.9 113/109 125/125 113/113 125/125 121/118
—— —
213.1 48 60 48 60 51
—— — 45 60 45 60 47
213.1 51 60 51 60 55
—— — 48 60 48 60 51
213.1 55 60 55 60 58
—— — 51 60 51 60 55
213.1 58 60 58 60 62
—— —
212.4 43 50 43 50 45
—— — 41 50 41 50 43
212.4 45 50 45 50 49
—— — 43 50 43 50 45
212.4 47 60 47 60 51
—— —
2 1 5.9 104/103 125/125 104/104 125/125 110/109
— — — 98/ 96 100/100 98/ 98 100/100 103/102
2 1 5.9 110/108 125/125 110/110 125/125 117/115
— — — 105/103 125/125 105/105 125/125 112/109
2 1 5.9 117/115 125/125 117/117 125/125 126/123
— — — 112/109 125/125 112/112 125/125 120/116
2 1 5.9 124/121 150/150 124/124 150/150 133/130
—— —
213.1 50 60 50 60 53
—— — 46 60 46 60 49
213.1 53 60 53 60 56
—— — 50 60 50 60 53
213.1 56 60 56 60 60
—— — 53 60 53 60 56
213.1 59 60 59 60 63
—— —
212.4 44 50 44 50 47
—— — 42 50 42 50 45
212.4 47 50 47 50 50
—— — 44 50 44 50 47
212.4 49 60 49 60 52
—— —
2 1 5.9 129/128 150/150 129/129 150/150 140/139
— — — 125/123 150/150 125/125 150/150 135/133
2 1 5.9 137/134 150/150 137/137 150/150 149/147
— — — 132/129 150/150 132/132 150/150 143/140
2 1 5.9 144/140 150/150 144/144 150/150 157/153
—— —
213.1 68 80 68 80 74
—— — 65 80 65 80 71
213.1 71 80 71 80 78
—— — 68 80 68 80 74
213.1 74 80 74 80 81
—— —
212.4 57 60 57 60 62
—— — 55 60 55 60 59
212.4 60 60 60 60 65
—— — 57 60 57 60 62
212.4 62 70 62 70 67
FLA
(ea)
COMBUSTION
FAN MO TOR
FLA MCA MOCP MCA MOCP FLA
0.5
0.3
0.24
0.5
0.3
0.24
0.5
0.3
0.24
POWER
SUPPLY*
80/ 79 100/100 80/ 80 100/100 84/ 83
42 50 42 50 44
38 50 38 50 40
92/ 91 100/100 92/ 92 100/100 96/ 95
44 50 44 50 46
39 50 39 50 41
117/116 125/125 117/117 125/125 127/125
62 70 62 70 67
52 60 52 60 56
POWER SUPPLY
UNITS WITH
OPTIONAL HACR
BREAKER
DISCONNECT
SIZE
13
Table 4B — Electrical Data (Units With Optional Powered Convenience Outlet)
UNIT
NOMINAL
SIZE
VO LTAGE
48HG
(3 Ph, 60 Hz)
208/230 187 253 28.2 208 28.2 208 — — 4 0.25 1.5
20
208/230 187 253 32.1 240 32.1 240 — — 6 0.25 1.5
24
208/230 187 253 28.2 208 28.2 208 28.2 208 6 0.25 1.5
28
VO LTAGE
RANGE
Min Max RLA LRA RLA LRA RLA LRA Qty Hp
460 414 506 15.4 104 15.4 104 — — 4 0.25 0.7
575 518 633 12.8 83 12.8 83 — — 4 0.25 0.7
460 414 506 15.4 110 15.4 110 — — 6 0.25 0.7
575 518 633 12.8 88 12.8 88 — — 6 0.25 0.7
460 414 506 15.4 104 15.4 104 15.4 104 6 0.25 0.7
575 518 633 12.8 83 12.8 83 12.8 83 6 0.25 0.7
COMPRESSOR
No. 1 No. 2 No. 3
OFM IFM
FLA
Hp FLA Qty Hp
(ea)
3.7 10.6/ 9.6
5 16.7/15.2
7.5 24.2 /22
10 30.8/28
3.7 4.8
57.6
7.5 11
10 14
56.1
7.5 9
10 11
3.7 10.6/ 9.6
5 16.7/15.2
7.5 24.2 /22
10 30.8/28
3.7 4.8
57.6
7.5 11
10 14
56.1
7.5 9
10 11
5 16.7/15.2
7.5 24.2 /22
10 30.8/28
57.6
7.5 11
10 14
56.1
7.5 9
10 11
POWER
EXHAUST
—— —
2 1 5.9 97/ 96 100/100 97/ 97 100/100 103/102
— — — 91/ 90 100/100 91/ 91 100/100 97/ 95
2 1 5.9 103/101 125/125 103/103 125/125 110/109
— — — 99/ 96 100/100 99/ 99 100/100 105/103
2 1 5.9 110/108 125/125 110/110 125/125 119/116
— — — 106/102 125/125 106/106 125/125 113/110
2 1 5.9 118/114 125/125 118/118 125/125 127/123
—— —
213.1 51 60 51 60 55
—— — 48 60 48 60 51
213.1 54 60 54 60 58
—— — 51 60 51 60 55
213.1 58 60 58 60 62
—— — 54 60 54 60 58
213.1 61 70 61 70 65
—— —
212.4 46 50 46 50 49
—— — 44 50 44 50 46
212.4 48 60 48 60 52
—— — 46 50 46 50 49
212.4 50 60 50 60 54
—— —
2 1 5.9 109/108 125/125 109/109 125/125 116/115
— — — 103/101 125/125 103/103 125/125 109/107
2 1 5.9 115/113 125/125 115/115 125/125 123/121
— — — 110/108 125/125 110/110 125/125 118/115
2 1 5.9 122/120 150/150 122/122 150/150 131/129
— — — 117/114 125/125 117/117 125/125 125/122
2 1 5.9 129/126 150/150 129/129 150/150 139/136
—— —
213.1 53 60 53 60 56
—— — 49 60 49 60 52
213.1 56 60 56 60 60
—— — 53 60 53 60 56
213.1 59 60 59 60 63
—— — 56 60 56 60 60
213.1 62 70 62 70 67
—— —
212.4 47 50 47 50 50
—— — 45 50 45 50 48
212.4 50 60 50 60 54
—— — 47 50 47 50 50
212.4 52 60 52 60 56
—— —
2 1 5.9 134/133 150/150 134/134 150/150 146/144
— — — 130/128 150/150 130/130 150/150 141/139
2 1 5.9 142/139 150/150 142/142 150/150 155/152
— — — 137/134 150/150 137/137 150/150 149/146
2 1 5.9 149/145 175/150 149/149 175/175 162/159
—— —
213.1 71 80 71 80 77
—— — 68 80 68 80 74
213.1 74 80 74 80 81
—— — 71 80 71 80 78
213.1 77 90 77 90 85
—— —
212.4 60 60 60 60 65
—— — 58 60 58 60 63
212.4 63 70 63 70 68
—— — 60 60 60 60 65
212.4 65 70 65 70 71
FLA
(ea)
COMBUSTION
FAN M OTO R
FLA MCA MOCP MCA MOCP FLA
0.5
0.3
0.24
0.5
0.3
0.24
0.5
0.3
0.24
POWER
SUPPLY*
85/ 84 100/100 85/ 85 100/100 90/ 89
45 60 45 60 48
41 50 41 50 43
97/ 96 100/100 97/ 97 100/100 102/101
47 60 47 60 49
42 50 42 50 45
122/121 150/125 122/122 150/150 133/131
65 80 65 80 70
55 60 55 60 59
POWER SUPPLY
UNITS WITH
OPTIONAL HACR
BREAKER
DISCONNECT
SIZE
14
LEGEND AND NOTES FOR TABLES 4A AND 4B
LEGEND
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA — Rated Load Amps
*Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440),
the overcurrent protective device for the unit shall be fuse or
HACR breaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%.
the percent voltage imbalance.
% Voltage Imbalance
= 100 x
max voltage deviation from average voltage
Use the following formula to determine
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage=
452 + 464 + 455
3
1371
=
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 - 452 = 5v
(BC) 464 - 457 = 7v
(AC) 457 - 455 = 2v
Maximum deviation is 7 v.
Determine percent voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%
7
457
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more
than 2%, contact the local electric utility company immediately.
3. The convenience outlet full load amps (FLA) are 5, 3, and 3 for
208/230, 460, 575-V units, respectively.
TOP HOOD
SECTION
SEAL
STRIP
LOCATION
BOTTOM
HOOD
SECTION
FILTER
RETAINER
MANUAL
DAMPER
(IF EQUIPPED)
NOTE: Units with manual damper only use one filter.
Fig. 18 — Outdoor-Air Hood Details
FILTER
GUIDE
HOOD
SIDE
FILTER
ADD
SEAL
STRIP
ADD
SEAL
STRIP
INNER
FILTER
TRACK
FILTER
GUIDE
HOOD
SIDE
ADD
SEAL
STRIP
UNIT
BACK
PANEL
ADD
SEAL
STRIP
15
Fig. 19 — Outdoor-Air Hood Assembled
LOCKING SCREW
MOVEABLE DAMPER
AIR FILTER POSITION
MOVEABLE DAMPER
Fig. 20 — Manual Damper Details
Step 11 — Position Optional Power Exhaust or
Barometric Relief Damper Hood —
power exhaust or barometric relief dampers are shipped
assembled and tilted back into the unit for shipping. Brackets
and extra screws are shipped in shrink wrap around the
dampers.
1. Remove 9 screws holding each damper assembly in
place. See Fig. 21. Each damper assembly is secured with
3 screws on each side and 3 screws along the bottom.
Save screws.
The optional
2. Pivot the damper assembly outward until top edge of the
damper assembly rests against the inside wall of unit.
3. Secure each damper assembly to unit with 6 screws
across top (3 screws provided) and bottom (3 screws
from Step 1) of damper.
4. With screws saved from Step 1, install brackets on each
side of damper assembly. See Fig. 22.
5. Remove tape from damper blades.
Step 12 — Non-Fused Disconnect — The handle
for the factory-installed non-fused disconnect is shipped inside
the unit to prevent the handle from damage during shipping.
Follow these steps to complete installation of the handle.
BESUREPOWERISSHUTOFFTOTHEUNITFROM
THE BUILDING POWER SUPPLY. Electrical shock
could cause personal injury.
1. Open the control box access door.
2. Remove the small cover plate located on the unit corner
post near the control section.
3. Remove the inner control box cover. The handle and shaft
are located in a plastic bag at the bottom of the control
box.
4. Insert the square shaft into the disconnect with the pins
vertical. On the 100-amp disconnect, the shaft is keyed
into the disconnect and can only be installed one way
(with the pins vertical).
5. Insert the handle through the corner post and onto the
shaft with the handle positioned so that “OFF” is on top.
6. Rotate the handle to the “ON” position to lock the pins
into the handle.
7. From the inside of the corner post, attach the handle
mounting screws to the handle. Slide the shaft fully into
the handle and tighten the set screw(s) on the disconnect
to lock the shaft. Tighten the screws that attach the handle
to the corner post.
8. Rotate the handle back to the “OFF” position.
9. Replace all panels and doors. Power can now be turned
back on to the unit.
Step 13 — Install All Accessories — After all of
the factory-installed options have been adjusted, install all
field-installed accessories. Refer to the accessory installation
instructions included with each accessory. Consult the Carrier
Price Pages for accessory package numbers for particular
applications.
Be careful when tilting blower assembly. Hoods and blowers are heavy and can cause injury if dropped.
16
Fig. 21 — Power Exhaust or Barometric Relief Damper Mounting Details
Fig. 22 — Bracket and Hood Positioning
17
PRE-START-UP
Failure to observe the following warnings could result in
serious personal injury.
1. Follow recognized safety practices and wear protective
goggles when checking or the servicing refrigerant
system.
2. Do not operate the compressor or provide any electric
power to the unit unless the compressor terminal cover
is in place and secured.
3. Do not remove the compressor terminal cover until all
electrical sources are disconnected.
4. Relieve all pressure from the system before touching or
disturbing anything inside the compressor terminal box
if refrigerant leak is suspected around the compressor
terminals.
5. Never attempt to repair a soldered connection while the
refrigerant system is under pressure.
6. Do not use torch to remove any component. The system contains oil and refrigerant under pressure. To
remove a component, wear protective goggles and proceed as follows:
a. Shut off gas and then electrical power to the unit.
Install lockout tag.
b. Relieve all pressure from the system using both
high-pressure and low-pressure ports.
c. Cut the component connection tubing with a tubing
cutter, and remove the component from the unit.
d. Carefully unsweat the remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Proceed as follows to inspect and prepare the unit for initial
start-up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING, CAU-
TION, and INFORMATION labels attached to, or
shipped with, the unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such as
broken lines, loose parts, or disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections
and on unit base. Detecting oil generally indicates a
refrigerant leak. Leak-test all refrigerant tubing connections using an electronic leak detector, halide
torch, or liquid-soap solution.
c. Inspect all field-wiring and factory-wiring connec-
tions. Be sure that connections are completed and
tight.
d. Inspect coil fins. If damaged during shipping and
handling, carefully straighten the fins with a fin
comb.
4. Verify the following conditions:
a. Make sure that condenser fan blade is correctly
positioned in the fan orifice. See Condenser-Fan
Adjustment section on page 49 for more details.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain trap is filled with
water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts
have been removed.
START-UP
Use the following information and 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 — Compressors are internally
spring mounted. Do not loosen or remove compressor holddown bolts.
Refrigerant Service Ports — Each independent re-
frigerant system has a total of 3 Schrader-type service gage
ports per circuit. One port is located on the suction line, one on
the compressor discharge line, and one on the liquid line. Be
sure that caps on the ports are tight.
Crankcase Heater(s) — Crankcase heaters are ener-
gized as long as there is power to the unit and the compressor is
not operating.
IMPORTANT: Unit power must be on for 24 hours prior
to start-up. Otherwise, damage to compressor may
result.
Compressor Rotation — On 3-phase units, it is impor-
tant to be certain the scroll compressor is rotating in the proper
direction. To determine whether or not compressor is rotating
in the proper direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pres-
sure does not rise to normal levels:
1. Note that the evaporator fan is probably also rotating in
the wrong direction.
2. Turn off power to the unit and install lockout tag.
3. Reverse any two of the unit power leads.
4. Turn on power to the unit.
The suction and discharge pressure levels should now move
to their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direc-
tion, the unit makes an elevated level of noise and does not
provide heating or cooling.
Compressor damage will occur if rotation is not immediately corrected.
Internal Wiring — Check all electrical connections in
unit control boxes; tighten as required.
Subcooler Heat Exchanger (SHX) — The subcool-
er heat exchanger adds approximately 10 to 15° F of subcooling to the system. Check all valves and TXV (thermostatic
expansion valve).
Evaporator Fan — Fan belt and variable pulleys are
factory-installed. See Tables 5-23 for fan performance data. Be
sure that fans rotate in the proper direction. See Table 24 for air
quantity limits. See Table 25 for evaporator fan motor specifications. See Table 26 for accessory/FIOP static pressure. See
Table 27 for fan rpm at various motor pulley settings. To alter
fan performance, see Evaporator Fan Performance Adjustment
sectiononpage48.
18
Condenser Fans and Motors — Condenser fans and
motors are factory set. Refer to Condenser-Fan Adjustment
section (page 49) as required.
Return-Air Filters — Check that correct filters are in-
stalled in filter tracks (see Table 1). Do not operate unit without
return-air filters.
NOTE: For units with 4-in. filter option, units are shipped with
standard 2-in. filters. To install 4-in. filters, the filter spacers
must be removed.
Outdoor-Air Inlet Screens — Outdoor-air inlet screens
must be in place before operating unit.
Gas Heat — Verify gas pressures before turning on heat as
follows:
1. Turn off field-supplied manual gas stop, located external
to unit.
2. Connect pressure gage to supply gas tap, located on fieldsupplied manual shutoff valve (see Fig. 14).
Table 5 — Fan Performance — 48PGD20 Vertical Supply/Return Units
3. Connect pressure gage to manifold pressure tap.
4. Turn on field-supplied manual gas stop. Temporarily
install the jumper wire between “R” and “W1” on TB2.
Set thermostat to HEAT and raise set point until heat
comes on.
5. After the unit has run for several minutes, verify the supply gas pressure is between 5.5 in. wg to 13.0 in. wg, and
the manifold pressure is 2.95 in. wg on horizontal discharge applications and 3.00 on vertical discharge applications. If manifold pressure must be adjusted, refer to
Gas Valve Adjustment section.
NOTE: Supply gas pressure must not exceed 13.0 in. wg.
6. Set thermostat to OFF.
7. Remove jumper wire if the unit will be operating under
thermostat mode.
8. Return thermostat to desired set point.
AIRFLOW
(Cfm)
5000 590 1.47 663 1.74 727 2.01 786 2.26 840 2.52
5500 633 1.82 703 2.11 764 2.40 820 2.67 872 2.94
6000 677 2.21 744 2.53 803 2.84 857 3.13 907 3.42
6500 722 2.67 786 3.01 842 3.33 894 3.64 942 3.95
7000 767 3.17 828 3.53 883 3.88 933 4.21 979 4.53
7500 813 3.74 871 4.12 924 4.48 972 4.83 1017 5.18
8000 859 4.36 915 4.77 966 5.15 1012 5.52 1056 5.88
8500 906 5.05 959 5.47 1008 5.87 1053 6.26 1096 6.64
9000 952 5.81 1004 6.25 1051 6.67 1095 7.07 1136 7.47
AIRFLOW
(Cfm)
5000 891 2.77 940 3.02 987 3.27 1032 3.52 1076 3.77
5500 921 3.21 968 3.48 1014 3.74 1057 4.01 1099 4.27
6000 954 3.70 999 3.99 1042 4.27 1084 4.55 1125 4.83
6500 988 4.25 1032 4.55 1073 4.85 1114 5.14 1153 5.44
7000 1024 4.85 1066 5.17 1106 5.48 1145 5.79 1183 6.10
7500 1060 5.51 1101 5.84 1140 6.17 1178 6.50 1215 6.82
8000 1098 6.23 1138 6.58 1176 6.92 1213 7.26 1249 7.60
8500 1137 7.01 1175 7.38 1212 7.74 1248 8.09 1283 8.45
9000 1176 7.86 1214 8.24 1250 8.61 1285 8.99 1319 9.36
Bhp — Brake Horsepower Input to Fan
Boldface indicates field-supplied motor/drive required.
NOTES:
1. Motor drive ranges:
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp
(C) Mid-High Range: 941-1176 r pm, 8.63 bhp
(D) High Range: 1014-1297 rpm, 11.50 bhp
All other rpms require field-supplied motor or drive.
2. See page 36 for general fan performance notes.
A
C
A
B
C
LEGEND
0.20.40.60.81.0
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
A
B
C
1.21.41.61.82.0
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
B
C
D
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
A
B
C
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
B
C
D
A
B
C
B
C
D
A
B
C
B
D
19
Table 6 — Fan Performance — 48PGE20 — Vertical Supply/Return Units
AIRFLOW
(Cfm)
5000 607 1.53 677 1.80 740 2.06 797 2.31 850 2.57
5500 652 1.90 719 2.19 779 2.47 833 2.74 884 3.01
6000 699 2.32 763 2.63 819 2.93 872 3.22 921 3.50
6500 746 2.79 807 3.12 861 3.44 911 3.75 958 4.05
7000 794 3.33 851 3.68 904 4.02 952 4.34 998 4.66
7500 842 3.93 897 4.30 947 4.65 994 5.00 1038 5.33
8000 891 4.59 943 4.98 991 5.35 1036 5.71 1079 6.07
8500 940 5.32 990 5.72 1036 6.11 1080 6.49 1121 6.87
9000 990 6.12 1037 6.54 1082 6.95 1124 7.35 1163 7.73
AIRFLOW
(Cfm)
5000 900 2.82 949 3.06 995 3.31 1040 3.56 1083 3.81
5500 933 3.27 979 3.54 1023 3.80 1066 4.06 1108 4.33
6000 967 3.79 1011 4.07 1054 4.35 1095 4.62 1135 4.90
6500 1003 4.35 1046 4.65 1087 4.94 1127 5.24 1165 5.53
7000 1041 4.98 1082 5.29 1122 5.60 1160 5.91 1197 6.22
7500 1079 5.67 1119 5.99 1158 6.32 1195 6.64 1231 6.96
8000 1119 6.42 1158 6.76 1195 7.10 1231 7.44 1267 7.78
8500 1160 7.23 1198 7.59 1234 7.95 1269 8.30 1303 8.65
9000 1202 8.12 1238 8.49 1273 8.87 1308 9.23 1341 9.60
Bhp — Brake Horsepower Input to Fan
Boldface indicates field-supplied motor/drive required.
NOTES:
1. Motor drive ranges:
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp
(C) Mid-High Range: 941-1176 r pm, 8.63 bhp
(D) High Range: 1014-1297 rpm, 11.50 bhp
All other rpms require field-supplied motor or drive.
2. See page 36 for general fan performance notes.
A
C
A
B
C
D
LEGEND
0.20.40.60.81.0
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
A
B
C
1.21.41.61.82.0
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
B
C
D
AVAILABLE EXTERNAL STATIC PRESSUSRE (in. wg)
A
B
C
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
B
C
D
A
B
C
B
C
D
A
B
C
B
D
20
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