Carrier 50PG16 series User manual

50PG16
Single Package Rooftop Units
Electric Cooling with PURONR(R---410A) Refrigerant
and COMFORTLinktControls
Installation Instructions
IMPORTANT: This installation instruction contains basic unit
installation information including installation of field control
devices. For information on unit start-up, service, and operation,
refer to the unit Controls, Start-Up, Operation, Service, and
Troubleshooting Instructions also enclosed in the unit literature
packet.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INSTALLATION 1-16.................................
Step 1 -- Provide Unit Support 1.........................
Step 2 -- Rig and Place Unit 3...........................
Step 3 -- Field Fabricate Ductwork 7......................
Step 4 -- Make Unit Duct Connections 7...................
Step 5 -- Install External Trap for Condensate Drain 7........
Step 6 -- Make Electrical Connections 9...................
Step 7 -- Install Outdoor--Air Hoods
(Units with Economizer) 15.....................
Step 8 -- Install All Accessories 16.......................
Step 9 -- Configure Controls 16.........................
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.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. There may be
more than one disconnect switch.
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in personal injury
or equipment damage.
Puronr(R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22
service equipment or components on Puronrrefrigerant
equipment.
CAUTION
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
!WARNING
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 ±1/16 in. 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.

2
C06310
Fig. 1 -- Base Unit Dimensions
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3
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.
Step 2 — Rig and Place Unit
Inspect unit for transportation damage. See Table 1 for physical
data. File any claim with transportation agency.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
All panels must be in place when rigging.
CAUTION
!
Do not drop unit; keep upright. Use spreader bars or top crating
over unit to prevent sling or cable damage. Rollers may be used to
move unit across a roof. Level by using unit rail as a reference;
leveling tolerance is ±1/16 in. per linear ft in any direction. See Fig.
2 for additional information. Unit rigging weight is shown in Fig.
2.
Rigging holes are provided in the unit base rails as shown in Fig. 2.
Refer to rigging instructions on unit.
Positioning
Maintain clearance, per Fig. 3, 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.
After unit is in position, remove top crating and polyethylene
sheet.
Roof Mount
Check building codes for weight distribution requirements. Unit
operating weight is shown in Table 1.
Installation Onto Curb
The 50PG units are designed to fit on the accessory full perimeter
curb. Correct placement of the unit onto the curb is critical to
operating performance. To aid in correct positioning, place unit on
roof curb to maintain 1/4-in. gap between the inside of rail and roof
curb on long sides and a 1/2-in. gap between the inside of rail and
roof curb on both duct and condenser ends. Refer to Fig. 1 and 3,
to assure proper duct opening alignment.
NOTE: Before positioning unit on curb make sure bottom drain
connection plug is tight. See Step 6 — Install External Trap for
Condensate Drain for details.
Hook 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.
CAU OTI
ACCESS PANEL MUST BE IN PLACE WHEN RIGGING.
N- NOTICE TO R GGERS:I
UNIT
SIZE
A B C D E MAX. WEIGHT
in. mm in. mm in. mm in. mm in. mm lb kg
16 100.4 2550 36-54 914-1371 52.4 1331 51.0 1295 35.0 889 1959 890
C06253
Fig. 2 -- 50PG Rigging Label
50PG16

4
Table 1 – Physical Data
BASE UNIT 50PG 16
NOMINAL CAPACITY (Tons) 15.0
OPERATING WEIGHT (lb)
Unit* 1771
Economizer
Vertical 149
Horizontal 149
Humidi-MiZer™System 64
Roof Curb
14-in. 240
24-in. 360
COMPRESSOR Fully Hermetic Scroll
Quantity 3
Oil Type Sys A Copeland 3MA
Sys B Copeland 3MA
Sys C Copeland 3MA
Number of Refrigerant Circuits 3
Oil (oz) Sys A 66
Sys B 66
Sys C 66
REFRIGERANT TYPE R-410A (Puron®Refrigerant)
Expansion Device TXV
Operating Charge (lb) Sys A 13.5
Sys B 15.0
Sys C 15.0
Operating Charge Total All Systems (lb) 43.5
Unit with Humidi-MiZer System
Operating Charge (lb) Sys A 18.8
Sys B 16.7
Sys C 18.8
Total All Systems (lb) 54.3
CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fins, Face Split
Condenser A (Outer)
Rows...Fins/in. 2…17
Face Area (sq ft) 26.6
Condenser B (Inner)
Rows...Fins/in. 2...17
Face Area (sq ft) 30.2
Humidi-MiZer Coil Enhanced Copper Tubes, Aluminum Lanced Fins
Rows...Fins/in. 1...17
Face Area (sq ft) 22.2
CONDENSER FAN Propeller
Quantity…Diameter (in.) 3...24
Nominal Cfm (Total, all fans) 12,500
Motor Hp 1/3
Nominal Rpm 1100
EVAPORATOR COIL Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Face Split
Rows…Fins/in. 3…15
Face Area (sq ft) 22.2
EVAPORATOR FAN Centrifugal Type, Belt Drive
Quantity…Size (in.) Low 1...15x15, 1...12x12
Mid-Low 1...15x15, 1...12x12
High 1...15x15, 1...12x12
Type Dri ve Low Belt
Mid-Low Belt
High Belt
Nominal Cfm 6000
Maximum Continuous Bhp Low 3.7
Mid-Low 5.25
High 7.5
Motor Frame Size Low 56
Mid-Low 56
HIgh S213T
Fan Rpm Range Low 710-879
Mid-Low 872-1066
High 1066-1260
Motor Bearing Type Ball
* See Legend on next page
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5
Table 1 — Physical Data (cont)
BASE UNIT 50PG (cont) 16
EVAPORATOR FAN (cont) Centrifugal Type, Belt Drive
Motor Pulley Pitch Diameter Min (in.) Low 4.2
Mid-Low 4.2
High 5.2
Motor Pulley PItch Diameter Max (in.) Low 5.2
Mid-Low 5.2
High 6.2
Fan Pulley Pitch Diameter Low 10.2
Mid-Low 8.5
High 8.5
Nominal Motor Shaft Diameter (in.) Low 7/8
Mid-Low 7/8
High 13/8
Belt…PitchLength(in.) Low 49.3
Mid-Low 47.8
High 43.8
Belt…Typ e Low AX
Mid-Low BX
High BX
Pulley Center Line Distance Min. (in.) Low 14.2
Mid-Low 10.8
High 8.6
Pulley Center Line Distance Max. (in.) Low 10.8
Mid-Low 14.2
High 12
Speed Change (rpm) Low 34
Mid-Low 41
High 41
Movable Turns Low 5
Mid-Low 5
High 5
FactoryPulleySetting(rpm) Low 812
Mid-Low 983
High 1191
Fan Shaft Diameter at Pulley (in.) 13/16
HIGH-PRESSURE SWITCH (psig)
Cutout 660 ±10
Reset (Auto.) 505 ±20
RETURN-AIR FILTERS Throwaway Type
Quantity…Size (in.) 8...20 x 20 x 2
LEGEND
TXV --- Thermostatic Expansion Valve
*Aluminum Evaporator/Aluminum Condenser coil fin material.
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6
C06306
Fig. 3 -- Roof Curb Details
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7
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Do not slide unit to position when it is sitting on the curb.
Curb gasketing material may be damaged and leaks may
result.
CAUTION
!
Step 3 — Field Fabricate Ductwork
On vertical units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. 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 if electric
heat is not used. Cabinet return-air static pressure (a negative
condition) shall not exceed 0.35--in. wg with economizer or
0.45--in. wg without economizer.
Step 4 — Make Unit Duct Connections
Vertical Supply/Return Configuration
Unit is shipped in vertical supply/return configuration. Ductwork
openings are shown in Fig. 1 and 3. Attach the ductwork to the
roof curb. Do not attach duct directly to the unit.
Duct connections are shown in Fig. 4. Field-fabricated concentric
ductwork may be connected as shown in Fig. 5.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90_turn
in the return ductwork between the unit and the conditioned
space. If a 90_elbow cannot be installed, then a grille of
sufficient strength and density should be installed to prevent
objects from falling into the conditioned space.
CAUTION
!
AIR
OUT
AIR
IN
ECONOMIZER
C06307
Fig. 4 -- Air Distribution -- Vertical Supply and Return
AIR OUT
AIR IN
AIR OUT
ECONOMIZER
C06308
Fig. 5 -- Air Distribution -- Concentric Duct
Horizontal Applications
Horizontal units are shipped with an outer panel that allows 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. Slide supply duct
dimensions and locations are shown on Fig. 3. Install ductwork to
horizontal duct flange connections on side of unit.
Units with electric heat require a 1-in. clearance for the first 24 in.
of ductwork. Outlet grilles must not lie directly below unit
discharge.
NOTE:A90_elbow must be provided in the supply ductwork to
comply with UL (Underwriters Laboratories) codes for use with
electric heat.
Step 5 — Install External Trap for Condensate
Drain
The unit’s 3/4-in. condensate drain connections are located on the
bottom and side of the unit. Unit discharge connections do not
determine the use of drain connections; either drain connection can
be used with vertical or horizontal applications. See Fig. 3 for
locations.
When using the standard side drain connection, make sure the plug
(red) in the alternate bottom connection is tight before installing the
unit. (See Fig. 7.)
To use the bottom drain connection for a roof curb installation,
relocate the factory-installed plug (red) from the bottom connection
to the side connection. A 1/2-in. socket extension can be used to
remove the plug. (See Fig. 7.) The piping for the condensate drain
and external trap can be completed after the unit is in place.
50PG16

8
ECONOMIZER HOODS
OUTDOOR AIR
SCREENS
(HIDDEN)
BAROMETRIC
RELIEF DAMPER
HOODS
ELECTRICAL
OPTIONS
PAN E L BASEPAN
CONNECTIONS
ACCESS PANEL
CONTROL BOX
AND COMPRESSOR
ACCESS DOOR
FILTER
ACCESS DOOR
ELECTRIC
HEAT ACCESS
PANEL
CONDENSER
COIL ACCESS
PAN E L
C06309
Fig. 6 -- Panel and Filter Locations
BOTTOM DRAIN
PLUG
SIDE DRAIN
PLUG
C06233
Fig. 7 -- Condensate Drain Pan
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9
OPTIONAL UNIONS
TO ALLOW FOR CONDENSATE
PAN REMOVAL
4" (102mm)
CONDENSATE
PAN ACCESS
PANEL
C06311
Fig. 8 -- External Trap for Condensate Drain
NOTE: Trap should be deep enough to offset maximum unit static difference
A
4-in. tra
p
is recommended.
C06291
Fig. 9 -- Condensate Drain Piping Details
DISCONNECT
PER NEC
FACTOR
POWER
WIRING
FIELD
POWER
WIRING
11
12
13
21
22
23
EQUIP GND
C.A1
Legend
C.A1 — Compressor Contactor (A1)
EQUIP —Equipment
GND — Ground
NEC — National Electrical Code
NOTE: The maximum wire size for C.A1 is 2/0.
C06237
Fig. 10 -- Field Power Wiring Connections
All units must have an external trap for condensate drainage. Install
a trap at least 4-in. deep and protect against freeze-up. 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 (3/4-in.). (See Fig. 8 and 9.)
The 50PG units are provided with a removable condensate pan for
ease of cleaning. It is recommended that a union be placed between
the unit and condensate drainage to ease the removal of the pan
during servicing. Adequate clearance should be allowed if removal
of condensate pan is required. Allow 54 in. between condensate
pan access panel and any obstruction for complete removal.
Step 6 — Make Electrical Connections
Field Power Supply
(For more details, refer to the Controls. Start--up, Operation and
Troubleshooting manual).
All 208/230-v units are factory wired for 230-v power supply. If
the 208/230-v unit is to be connected to a 208-v power supply, the
transformers (TRAN1 and TRAN2) must be rewired by moving
the black wire with the 1/4-in. female quick connect from the
230-volt connection and moving to the 200-volt 1/4-in. male
terminal on the primary side of the transformer.
Refer to unit label diagram for additional information. Leads are
provided for field wire connections. Use UL approved
copper/aluminum connector.
When installing units, provide safety disconnect per NEC
(National Electrical Code) Article 440 or local codes. For
non-fused disconnects, size the disconnect according to the sizing
data provided in the electrical data tables. If a fused disconnect is
used, determine the minimum size for the switch based on the
disconnect sizing data provided in the electrical data tables and
then coordinate the disconnect housing size to accommodate the
Maximum Overcurrent Protection (MOCP) device size as marked
on the unit informative plate. (See Table 2 and 3.) 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. 10
for power wiring connection to the unit leads and equipment
ground.
Route power and ground lines through control box end panel or
unit basepan (see Fig. 3) to connections as shown on unit wiring
diagram and Fig. 10. Factory leads may be wired directly to the
disconnect.
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Table 2 – Electrical Data — Units Without Optional Powered Convenience Outlet
UNIT
50PG
NOMINAL
POWER
SUPPLY
(V-PH-HZ)
VOLTAGE
RANGE
COMPR
NO. 1
COMPR
NO. 2
COMPR
NO. 3 OFM-
FLA
POWER
EXHAUST IFM
TYPE
IFM
FLA
ELECTRIC HEAT POWER SUPPLY CRSINGLE
PART NO.
(NOTE3)
DISCONNECT SIZE WIRING
FIG. NO.
MIN MAX RLA LRA RLA LRA RLA LRA QTY FLA CRHEATER
PART NO. FLA NOMINAL KW* MCA MOCP FLA LRA
16
208/230-3-60 187 253 18.1 137 18.1 137 17.6 123 1.9
— —
Low 10.2
— — —/— 74.2/ 74.2 90/ 90 —80/80 482/482 —
255A00 52.1/ 60.1 18.8/25.0 77.9/ 87.9 90/ 90 034 80/81 482/482 20
256A00 104.2/120.3 37.6/50.0 143.0/133.0 150/150 034 132/150 482/482 20
257A00 156.3/180.4 56.3/75.0 169.1/193.2 200/225 034 192/219 482/482 20
Mid-
Low 15.0
— — —/— 79.0/ 79.0 90/ 90 —86/ 86 491/491 —
255A00 52.1/ 60.1 18.8/25.0 83.9/ 93.9 90/100 034 86/ 86 491/491 20
256A00 104.2/120.3 37.6/50.0 149.0/139.0 150/175 034 137/156 491/491 20
257A00 156.3/180.4 56.3/75.0 175.1/199.2 200/225 034 197/225 491/491 20
High 19.4
— — —/— 83.4/ 83.4 100/100 —91/ 91 529/529 —
255A00 52.1/ 60.1 18.8/25.0 89.4/ 99.4 100/100 034 91/ 91 529/529 20
256A00 104.2/120.3 37.6/50.0 154.5/144.5 175/175 034 142/161 529/529 20
257A00 156.3/180.4 56.3/75.0 180.6/204.7 200/225 034 202/230 529/529 20
23.0
Low 10.2
— — —/— 77.2/ 77.2 90/ 90 —84/ 84 486/486 —
255A00 52.1/ 60.1 18.8/25.0 81.6/ 91.7 90/100 034 84/ 84 486/486 20
256A00 104.2/120.3 37.6/50.0 146.8/136.8 150/150 034 135/154 486/486 20
257A00 156.3/180.4 56.3/75.0 172.8/196.9 200/225 034 195/223 486/486 20
Mid-
Low 15.0
— — —/— 82.0/ 82.0 100/100 —89/ 89 495/495 —
255A00 52.1/ 60.1 18.8/25.0 87.6/ 97.7 100/100 034 89/ 90 495/495 20
256A00 104.2/120.3 37.6/50.0 152.8/142.8 175/175 034 141/159 495/495 20
257A00 156.3/180.4 56.3/75.0 178.8/202.9 200/225 034 200/228 495/495 20
High 19.4
— — —/— 86.4/ 86.4 100/100 —94/ 94 533/533 —
255A00 52.1/ 60.1 18.8/25.0 93.1/103.2 100/110 034 94/ 95 533/533 20
256A00 104.2/120.3 37.6/50.0 158.3/148.3 175/175 034 146/164 533/533 20
257A00 156.3/180.4 56.3/75.0 184.3/208.4 200/250 034 206/233 533/533 20
460-3-60 414 506 9.0 62 9.0 62 7.7 50 1.0
— —
Low 4.8
— — —/— 35.8 40 —39 215 —
258A00 30.1 25.0 43.6 45 035 40 215 21
259A00 60.1 50.0 66.1 80 036 75 215 22
260A00 90.2 75.0 96.2 100 036 109 215 22
Mid-
Low 7.4
— — —/— 38.4 45 —42 219 —
258A00 30.1 25.0 46.8 50 035 43 219 21
259A00 60.1 50.0 69.4 80 036 78 219 22
260A00 90.2 75.0 99.5 110 036 112 219 22
High 9.7
— — —/— 40.7 50 —44 238 —
258A00 30.1 25.0 49.7 50 035 46 238 21
259A00 60.1 50.0 72.3 80 036 80 238 22
260A00 90.2 75.0 102.3 125 036 115 238 22
21.2
Low 4.8
— — —/— 37.0 45 —40 217 —
258A00 30.1 25.0 45.1 50 035 41 217 21
259A00 60.1 50.0 67.6 80 036 76 217 22
260A00 90.2 75.0 97.7 100 036 111 217 22
Mid-
Low 7.4
— — —/— 39.6 45 —43 222 —
258A00 30.1 25.0 48.3 50 035 44 222 21
259A00 60.1 50.0 70.9 80 036 79 222 22
260A00 90.2 75.0 101.0 110 036 114 222 22
High 9.7
— — —/— 41.9 50 —46 241 —
258A00 30.1 25.0 51.2 60 036 47 241 21
259A00 60.1 50.0 73.8 80 036 82 241 22
260A00 90.2 75.0 103.8 125 036 116 241 22
575-3-60 518 633 6.8 50 6.8 50 6.1 40 0.8
— —
Low 2.8
— — —/— 26.6 30 —29 167 —
261A00 24.1 25.0 33.6 35 035 31 167 21
262A00 46.2 50.0 49.7 60 035 56 167 21
263A00 72.2 75.0 75.7 80 036 86 167 22
Mid-
Low 5.6
— — —/— 29.4 35 —32 181 —
261A00 24.1 25.0 37.1 40 035 34 181 21
262A00 46.2 50.0 53.2 60 035 60 181 21
263A00 72.2 75.0 79.2 90 036 89 181 22
High 7.8
— — —/— 31.6 35 —34 196 —
261A00 24.1 25.0 39.8 40 035 37 196 21
262A00 46.2 50.0 55.9 60 035 62 196 21
263A00 72.2 75.0 81.9 90 036 92 196 22
23.0
Low 2.8
— — —/— 29.6 35 —32 171 —
261A00 24.1 25.0 37.3 40 035 34 171 21
262A00 46.2 50.0 53.4 60 035 60 171 21
263A00 72.2 75.0 79.4 90 036 90 171 22
Mid-
Low 5.6
— — —/— 32.4 35 —35 185 —
261A00 24.1 25.0 40.8 45 035 38 185 21
262A00 46.2 50.0 56.9 60 035 63 185 21
263A00 72.2 75.0 82.9 90 036 93 185 22
High 7.8
— — —/— 34.6 40 —38 200 —
261A00 24.1 25.0 43.6 45 035 40 200 21
262A00 46.2 50.0 59.7 70 035 66 200 21
263A00 72.2 75.0 85.7 100 036 95 200 22
50PG16

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Table 3 – Electrical Data — Units With Optional Powered Convenience Outlet
UNIT
50PG
NOMINAL
POWER
SUPPLY
(V-PH-HZ)
VOLTAGE
RANGE
COMPR
NO. 1
COMPR
NO. 2
COMPR
NO. 3 OFM POWER EXHAUST IFM
TYPE
IFM ELECTRIC HEAT POWER SUPPLY CRSINGLE
PART NO.
(NOTE 3)
DISCONNECT SIZE
WIRING-
FIG. NO.
MIN MAX RLA LRA RLA LRA RLA LRA FLA QTY FLA FLA CRHEATER
PART NO. FLA NOMINAL KW* MCA MOCP FLA LRA
16
208/230-3-60 187 253 18.1 137 18.1 137 17.6 123 1.9
— —
Low 10.2
— — —/— 79.0/ 79.0 90/ 90 —86/ 86 487/487 —
255A00 52.1/ 60.1 18.8/25.0 83.9/ 93.4 90/100 034 86/ 86 487/487 20
256A00 104.2/120.3 37.6/50.0 149.1/138.5 150/150 034 137/156 487/487 20
257A00 156.3/180.4 56.3/75.0 175.1/198.6 200/225 034 197/225 487/487 20
Mid-
Low 15.0
— — —/— 83.8/ 83.8 100/100 —91/ 91 495/495 —
255A00 52.1/ 60.1 18.8/25.0 89.9/ 99.4 100/100 034 91/ 92 495/495 20
256A00 104.2/120.3 37.6/50.0 155.1/144.5 175/175 034 143/161 495/495 20
257A00 156.3/180.4 56.3/75.0 181.1/204.6 200/225 034 203/230 495/495 20
High 19.4
— — —/— 88.2/ 88.2 100/100 —96/ 96 534/534 —
255A00 52.1/ 60.1 18.8/25.0 95.4/104.9 100/110 034 96/ 97 534/534 20
256A00 104.2/120.3 37.6/50.0 160.6/150.0 175/175 034 148/166 534/534 20
257A00 156.3/180.4 56.3/75.0 186.6/210.1 200/250 034 208/235 534/534 20
23.0
Low 10.2
— — —/— 82.0/ 82.0 100/100 —89/ 89 491/491 —
255A00 52.1/ 60.1 18.8/25.0 87.7/ 97.1 100/100 034 89/ 90 491/491 20
256A00 104.2/120.3 37.6/50.0 152.8/142.2 175/175 034 141/159 491/491 20
257A00 156.3/180.4 56.3/75.0 178.9/202.4 200/225 034 201/228 491/491 20
Mid-
Low 15.0
— — —/— 86.8/ 86.8 100/100 —95/ 95 499/499 —
255A00 52.1/ 60.1 18.8/25.0 93.7/103.1 100/110 034 95/ 95 499/499 20
256A00 104.2/120.3 37.6/50.0 158.8/148.2 175/175 034 146/165 499/499 20
257A00 156.3/180.4 56.3/75.0 184.9/208.4 200/225 034 206/234 499/499 20
High 19.4
— — —/— 91.2/ 91.2 100/100 —100/100 538/538 —
255A00 52.1/ 60.1 18.8/25.0 99.2/108.6 100/110 034 100/100 538/538 20
256A00 104.2/120.3 37.6/50.0 164.3/153.7 175/175 034 151/170 538/538 20
257A00 156.3/180.4 56.3/75.0 190.4/213.9 200/250 034 211/239 538/538 20
460-3-60 414 506 9.0 62 9.0 62 7.7 50 1.0
— —
Low 4.8
— — —/— 37.9 45 —41 217 —
258A00 30.1 25.0 46.3 50 035 43 217 21
259A00 60.1 50.0 68.9 80 036 77 217 22
260A00 90.2 75.0 98.9 100 036 112 217 22
Mid-
Low 7.4
— — —/— 40.5 45 —44 221 —
258A00 30.1 25.0 49.6 50 035 46 221 21
259A00 60.1 50.0 72.1 80 036 80 221 22
260A00 90.2 75.0 102.2 110 036 115 221 22
High 9.7
— — —/— 42.8 50 —47 240 —
258A00 30.1 25.0 52.4 60 035 48 240 21
259A00 60.1 50.0 75.0 80 036 83 240 22
260A00 90.2 75.0 105.1 125 036 117 240 22
21.2
Low 4.8
— — —/— 39.1 45 —42 220 —
258A00 30.1 25.0 47.8 50 035 44 220 21
259A00 60.1 50.0 70.4 80 036 79 220 22
260A00 90.2 75.0 100.4 110 036 113 220 22
Mid--
Low 7.4
— — —/— 41.7 50 —45 224 —
258A00 30.1 25.0 51.1 60 035 47 224 21
259A00 60.1 50.0 73.6 80 036 82 224 22
260A00 90.2 75.0 103.7 125 036 116 224 22
High 9.7
— — —/— 44.0 50 —48 243 —
258A00 30.1 25.0 53.9 60 035 50 243 21
259A00 60.1 50.0 76.5 80 036 84 243 22
260A00 90.2 75.0 106.6 125 036 119 243 22
575-3-60 518 633 6.8 50 6.8 50 6.1 40 0.8
— —
Low 2.8
— — —/— 28.3 35 —31 169 —
261A00 24.1 25.0 35.7 40 035 33 169 21
262A00 46.2 50.0 51.9 60 035 58 169 21
263A00 72.2 75.0 77.8 90 036 88 169 22
Mid-
Low 5.6
— — —/— 31.1 35 —34 183 —
261A00 24.1 25.0 39.2 40 035 36 183 21
262A00 46.2 50.0 55.4 60 035 62 183 21
263A00 72.2 75.0 81.3 90 036 91 183 22
High 7.8
— — —/— 33.3 40 —36 198 —
261A00 24.1 25.0 42.0 45 035 39 198 21
262A00 46.2 50.0 58.1 60 035 64 198 21
263A00 72.2 75.0 84.1 100 036 94 198 22
23.0
Low 2.8
— — —/— 31.3 35 —34 173 —
261A00 24.1 25.0 39.5 40 035 36 173 21
262A00 46.2 50.0 55.6 60 035 62 173 21
263A00 72.2 75.0 81.6 90 036 92 173 22
Mid--
Low 5.6
— — —/— 34.1 40 —37 187 —
261A00 24.1 25.0 43.0 45 035 40 187 21
262A00 46.2 50.0 59.1 60 035 65 187 21
263A00 72.2 75.0 85.1 90 036 95 187 22
High 7.8
— — —/— 36.3 40 —40 202 —
261A00 24.1 25.0 45.7 50 035 42 202 21
262A00 46.2 50.0 61.9 70 035 68 202 21
263A00 72.2 75.0 87.8 100 036 97 202 22
*See Legend on next page
50PG16

12
LEGEND
FLA --- F u l l L o a d A m p s
HACR --- Heating, Air Conditioning and Refrigeration
IFM --- Indoor --- Fan Motor
LRA --- L o c ke d R o t o r A m p s
MCA --- Minimum Circuit Amps
MOCP --- Maximum Overcurrent Protection
NEC --- National Electrical Code
OFM --- Outdoor--- Fan Motor
RLA --- RatedLoadAmps
* Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v. If power distribution
voltage to unit varies from rated heater voltage, heater kW will vary accordingly.
† Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the
unit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than
2%. Use the following formula to determine the percentage of voltage imbalance.
% Voltage Imbalance = 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 460-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage = 224 + 231 + 226
3
681
3
=
227
=
Determine maximum deviation from average voltage.
(AB) 227 – 223 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
4
227
= 1.76%
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 your local electric
utility company immediately.
50PG16

13
TB1
REMOVABLE JUMPER
THERMOSTAT ASSEMBLY
RH RC Y1 Y2 W1 W2 G C LX
RY1 Y2 W1 W2 G C X
ROOFTOP UNIT
C06292
Fig. 11 -- Field Control Thermostat Wiring
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
The correct power phasing is critical to the operation of the
scroll compressors. An incorrect phasing will result in an
alarm being generated and compressor operation lockout.
Should this occur, power phase correction must be made to
the incoming power. Damage to compressor could result.
CAUTION
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
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
(American National Standards Institute)/NFPA (National
Fire Protection Association), latest edition, and local
electrical codes.
!WARNING
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. 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
(Units Without Optional Humidi--MiZertAdaptive
Dehumidification System)
Unit can be controlled with either a Carrier-approved accessory
thermostat or a Carrier-approved space temperature sensor. Install
thermostat according to the installation instructions included with
accessory. Locate thermostat assembly or space temperature sensor
on a solid interior wall in the conditioned space to sense average
temperature.
Route thermostat or space temperature sensor cable or equivalent
single leads of colored wire from subbase terminals through
conduit into unit to low-voltage connections as shown on unit label
wiring diagram and in Fig. 11 and 12.
SPT — Space Temperature Sensor
12 3
T-55 SPT T-56 SPT
T55
TB1
RED
BLACK
RED
BLACK
WHITE
JUMPER
SEN SET
SEN
ROOFTOP UNIT
C06239
Fig. 12 -- Field Control Temperature Sensor Wiring
OC RY1
Y2 W1 W2 GCDEHUM
5RY1 Y2 W1 W2 GC12
HUMIDISTAT
ROOFTOP UNIT
TB1
THERMIDISTAT
C07055
Fig. 13 -- Field Thermidistat™Wiring
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gauge) 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.
Set heat anticipator settings as follows:
VOLTAGE STAGE 1
(W1) ON
STAGE 1 AND 2
(W1 AND W2) ON
All 0.2 0.4
Settings may be changed slightly to provide a greater degree of
comfort for a particular installation.
Field Control Wiring
(Units With Optional Humidi--MiZer Adaptive Dehumidifcation
System)
Units require temperature control inputs for cooling and heating
operation and humidity control inputs for Humidi-MiZer
operation.
Temperature Control
The unit can be controlled with either a Carrier-approved space
temperature sensor, a Carrier accessory Thermidistat device, or a
Carrier-approved accessory thermostat. Install the temperature
control device according to the installation instructions included
with the accessory. Locate the device on a solid interior wall in the
conditioned space to sense average temperature. Carrier space
temperature sensor wiring connections are shown in Fig. 12.
General thermostat field control wiring connections are shown in
Fig. 11. Carrier Thermidistat device wiring connections are shown
in Fig. 13. Configuration of the unit control is required to specify
the control input type before unit operation.
50PG16

14
C07045
Fig. 14 -- Humidi--MiZertLow--Voltage Terminal Strip -- Humidity Sensor/Humidistat Wiring
C07191
Fig. 15 -- Third Party Smoke Detector on Humidi--MiZer
Route thermostat or space temperature sensor cable or equivalent
single leads of colored wire from subbase terminals through
conduit into unit to low-voltage connections as shown on unit label
wiring diagram and in Fig. 11-13.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gauge) 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.
Set heat anticipator settings as follows:
VOLTAGE STAGE 1
(W1) ON
STAGE 1 AND 2
(W1 AND W2) ON
All 0.2 0.4
Settings may be changed slightly to provide a greater degree of
comfort for a particular installation.
50PG16

15
Humidity Control
Unit can be controlled with either a Carrier accessory Thermidistat
device or a Carrier--approved accessory humidistat (switch output).
The input for an accessory humidity sensor with 4 to 20 mA output
is another option available when an economizer board is installed.
Install the humidity control device according to the installation
instructions included with the accessory. Locate the device on a
solid interior wall in the conditioned space to sense average
humidity. Carrier Thermidistat device wiring connections are
shown in Fig. 13. General humidistat wiring connections are
shown in Fig. 14. Configuration of the unit control is required to
specify the control input type before unit operation. Refer to the
Controls, Start--up, Operation and Troubleshooting manual for
configuration.
Units with the Humidi--MiZertoption receive a discrete input
from a field--installed device (such as from the Carrier humidistat
or Thermidistat device). The discrete input is connected to the TB1
terminal strip points labeled Humidistat 1 and 2. As this is a
discrete input, one of the connection points is for power to the
switch and the other is the return path. (See Fig. 14.)
A space relative humidity sensor input (SP.RH) is only available if
an economizer board (ECB) is installed in the unit and then the
sensor can be connected to the OAQ point TB1--4. (See Fig. 14.)
This input is used instead of the discrete humidistat or thermidistat
inputs. The input controls the Humidi--MiZer using the 4--20mA as
percent humidity. The relative humidity value (measured by the
relative humidity sensor) can be displayed on the Scrolling
Marquee, in the space through a System Pilottdevice, or can be
read by other CCN devices where it can be used to perform more
advanced functions. The humidity sensor must be configured
correctly; refer to the Controls, Start--up, Operation, and
Troubleshooting manual for details.
If the customer also wishes to install a smoke detector into a
Humidi--MiZer equipped 50PG unit, the fire shutdown connection
points are on Plug PL-19, located in the economizer section. See
the unit wiring schematic for wiring. For third--part smoke
detector, see Fig. 15.
Point 19-3 is the 24 vac power source for the detector and point
19-5 is the 24 vac signal input for fire shutdown.
More information is available in the third party control section of
the controls, start-up, operation, and troubleshooting manual.
Step 7 — Install Outdoor Air Hoods (Units with
Economizer)
Perform the following procedure to install the outdoor-air hoods:
1. Economizer and barometric relief/power exhaust hoods are
located in the condenser section under the slanted coil for
shipping. (See Fig. 16.) Barometric relief/power exhaust
hoods are shipped inside each economizer hood.
Remove screws that secure the wooden rails of the hood
assemblies to the unit. Save screws. Slide complete
assembly from condenser section.
POWER EXHAUST/
BAROMETRIC
RELIEF HOODS
ECONOMIZER
HOODS
WOODEN RAILS
C06259
Fig. 16 -- Economizer and Barometric Relief/Power Exhaust
Hoods Shipping Positions
ECONOMIZER
HOODS
POWER EXHAUST/
BAROMETRIC
RELIEF HOODS
BAROMETRIC RELIEF
DAMPER SCREW (TYP)
ECONOMIZER
PANEL
BAFFLE
C06261
Fig. 17 -- Hood Installation
2. Remove the screws that secure the economizer and
barometric relief/power exhaust hoods to the wooden
railing. Discard or recycle wooden rails. Save the screws.
3. The barometric relief dampers are factory-installed on to the
economizer panel for shipping. Remove the screw holding
the barometric relief dampers to the panel. Dampers should
be free to swing open during operation. (See Fig. 17.)
4. Hang the barometric relief/power exhaust hood on the
mounting flange on the economizer panel. Secure hood to
panel with screws saved from Step 2. (See Fig. 17 and 18.)
Repeat for second hood.
50PG16

16
5. Align hole in flange of economizer panel with left edge of
hood. Hang economizer hood on the top flange of the
economizer panel by rotating hood until top flange of the
economizer hood engages the bent flange on the
economizer panel. Rotate hood until hood is flush with the
economizer panel. Hood will support itself from flange.
Align holes in hood with holes in panel and secure hood to
panel with screws saved from Step 2. (See Fig. 17 and 19.)
Repeat for second hood.
Loosen screws securing the clip on top of the flange of each
opening. Rotate clip 180_and tighten screw. Install 1--in.
filter provided by inserting under the clip on the flange and
letting filter drop behind bracket holding barometric relief
hoods. Repeat for second hood. Install baffle between the
outdoor air hoods with the screws saved from item 1. (See
Fig. 17.)
Step 8 — 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.
Step 9 — Configure Controls
Refer to unit Controls and Troubleshooting literature for all
controls information.
BAROMETRIC
RELIEF HOOD
MOUNTING
FLANGE
POWER EXHAUST
/
C06262
Fig. 18 -- Barometric Relief/Power Exhaust Hood Flange
MOUNTING
FLANGE
ECONOMIZER
HOOD
C06263
Fig. 19 -- Economizer Flange
Copyright 2007 Carrier Corp. S7310 W. Morris St. SIndianapolis, IN 46231 Printed in U.S.A. Edition Date: 10/07
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:50PG---38SI
Replaces: 50PG--- 18SI
50PG16