Carrier 48PG Series Dimensions and installation guide

48PG03-07
Single Package Rooftop Units
Electric Cooling/Gas Heating
with PURON® (R-410A) Refrigerant
and Electromechanical Controls
Installation, Start-Up, and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ....................... 1,2
INSTALLATION ................................... 2-19
Step 1-- Plan for Unit Location ..................... 2
Step 2 -- Provide Unit Support ...................... 2
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 3 -- Rig and Place Unit ......................... 2
• INSTALLATION ONTO CURB
• SLAB MOUNT (Horizontal Units Only)
Step 4 -- Field Fabricate Ductwork .................. 4
Step 5 -- Make Unit Duct Connections .............. 4
Step 6 -- Install Flue Hood and Inlet Hood ........... 7
Step 7 -- Install External Trap
for Condensate Drain .............................. 8
Step 8 -- Install Gas Piping .......................... 9
Step 9 -- Make Electrical Connections .............. 9
•FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 10 -- Optional EconoMi$er IV ................. 13
Step 11 -- Install All Accessories ................... 19
PR E-START-U P..................................... 20
START-UP ....................................... 20-36
SERVICE ........................................ 37-45
Cleaning ............................................ 37
Lubrication ......................................... 38
Evaporator Fan Service and Replacement .......... 39
Evaporator Fan Performance Adjustment ........... 39
Evaporator Fan Belt Tension Adjustment ........... 39
Condenser-Fan Adjustment ........................ 39
Verify Sensor Performance ......................... 40
Economizer Operation During Power Failure ....... 40
Evacuation ......................................... 40
Refrigerant Charge ................................. 40
Gas Valve Adjustment .............................. 42
High Altitude ....................................... 42
LP (Liquid Propane) Gas Use ....................... 42
Main Burners ....................................... 42
Filter Drier .......................................... 43
Protective Devices .................................. 43
Relief Devices ...................................... 43
Control Circuit 24-V ................................ 43
Replacement Parts ................................. 43
Diagnostic LEDs .................................... 43
TROU BLESHOOTING ............................ 46-49
Unit Troubleshooting ............................... 46
EconoMi$er IV Troubleshooting .................... 48
Phase Loss Protection ............................. 49
UNIT START-UP CHECKLIST ..................... CL-I
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electtic_d components.
Only trained and qu_dified service personnel should inst_dl,
repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per-
sonnel. When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for _dl 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 pres-
sures than stan&trd 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 dmnage or personal injury may result.
1. [mproper inst_dlation, adjustment, alteration, service,
or maintenance can cause property &Lmage, personal
injury, or loss of life. Refer to the User's Information
Manual provided with this unit for mote 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 neigh-
bor's phone. Follow the gas supplier's instructions.
4. If you cannot reach your gas supplier, c_dl the fire
department.
Disconnect gas piping flom unit when pressure testing at
pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in haztudous
condition. [f 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).
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 534-80209 Printed in U.S,A, Form 48PG-8SI Pg 1 8-05 Replaces: New

IMPORTANT: Units have high ambient operating limits. If [
limits are exceeded, the units will automatically lock the I
compressor out of operation. Manual reset will be required
to restart the compressor:
INSTALLATION
Step 1 -- Plan for Unit Location -- Select a loca-
tion for the unit and its support system (curb or other) that
provides minimum clearances required for safety, unit perfor-
mance and service access below, around and above unit as
specified in unit drawings. Consider also the effect of adjacent
units.
Do not install unit in an indoor location. Do not locate ;dr
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 Z223A (American Natiomd Stan&u_ds Institute). Al-
though unit is weatherproof, guard against water from higher
level runoff and overhangs.
I_cate mechanical &_afl system flue assembly at least 4 ft
fi_om any opening through which combustion products could
enter the building, and at least 4 fl fi_)m any adjacent building
(or per local code). Locate the flue assembly at least 10 fl (or
per local code) from an adjacent unit's fi_eshair intake hood if
within 3 ft of stone elevation. When unit is located adjacent to
public w;dkways, flue assembly must be at least 7 fl above
grade.
Select a unit mounting system that provides adequate height
to allow installation of condensate trap per requirements. Refer
to Step 7 -- Install External Trap for Condensate Drain for re-
quired trap dimensions.
ROOF MOUNT -- Check building codes for weight distribu-
tion requirements. Unit operating weight is shown in Table 1.
Step 2 -- Provide Unit Support
ROOF CURB -- Asselnble or install accessory roof curb in
accordance with instructions shipped with this accessory. See
Fig. 1. Install insulation, cant strips, roofing, and counter flash-
ing as shown. DuctwoN can be inst_dled to roof curb before unit
is set in place. DuctwoN must be attached to curb and not to the
unit. Curb must be level. This is necessary to permit unit drain to
limction properly. Unit leveling tolerance is _+J/l_ in. per linem
1l in any direction. Refer to Accessory Roof Curb Installation
Instructions for additional information as required. When acces-
sory roof curb is used, unit may be installed on class A, B, or C
roof covering material. C_urier 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, inst_dl 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 equal-
ly spaced 4-in. x 4-in. pads on each side.
Step 3 -- Rig and Place Unit -- Inspectunit for trans-
portationdmnage. See Table 1 for physical &_ta. File any claim
with transportation agency.
All panels must be in place when rigging. Damage to unit
may result.
Do not di'op unit; keep upright. Use spreader baLs 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 refelence; level-
ing 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.
INSTALLATION ONTO CURB -- The 48PG units gue de-
signed to fit on the accessory full perimeter curb. Correct
placement of the unit onto the curb is critical to operating per-
formance. To aid in correct positioning, place unit on roof curb
to maintain l/4-in, gap between the inside of rail and roof curb
on long sides and a l/2-in, gap between the inside of rail grad
roof curb on both duct and condenser ends. Refer to Fig. 1 and
3, to assure proper duct opening alignment.
NOTE: Before positioning unit onto curb, refer to Step 7 --
Install External Trap for Condensate Drain on page 8 for
cle_uances.
Do not slide unit to position it when it is sitting on the curb.
Curb gasketing material may be &imaged and leaks may
result.
SLAB MOUNT (Horizontal Units Only) -- Provide a level
concrete slab that extends a minimum of 6-in. beyond unit cab-
inet. Install a grovel apron in front of condenser-coil air inlet to
prevent gross and foliage from obstructing airflow.
NOTE: Horizont_d units may be inst_flled on a roof curb if
required.

SU?PL7 AIR
OPENING
o_'
[151 0]
_op N NG FOR
ELECiR[CAL
SERV_C
'1
1.
SEE DETAIL D \ SEE OEiAII E_\
\ \
REAR
GASKET
o 7M0: [111_
RIGID INSULAI[ON <
(F[ELD SUPPLEEb)
NAIL
COUNTER FLASHING
(FIELD SUPPLIED)
ROOFING FELT
(FIELD SUPPLIED)
CA_r STRIP
I_IELD SUPPI[{D)
ROO_]NG MAi_iAL
(_[ELD SUPPLIEDI
TYPICAL 4 S]OES
3131132 ':
[964 3]_
i O2 3/8 ¸=
Fig. 1 -- Roof Curb Details
UNH SIZE CONNECTOR
i 48PG i "C= ACCESSO_
, , PACKAGE
i.... i......L.......
[6 4] --) --
[>E]A[L D
SCA_E 11:37
112
DETAIL
SCALE I]:32
NOTES:
ROOFCUR_ ACCESSORYIS S_IPPEO UNASSEM_LED
INS_LAT[_ PANELS¸
_I_ENSIONS IN I ]_RE iN _[LLi_ETERS
ROOFC_R_ _ALVANIZE_ 81_EL
ATTACH _UCi_OR_ TO ¢UR_ _EL_G_S ON _UCT
SE_ViCE CLEARANC_ 4 H O_ E_C_ SIDE
GAS SERV;CE ?LAIE IS _ARi OF A SEPARATELY
SHIPP_ ACCESSORYPACKAGE
GAS SERVICE ?LAI_ CAN _E USED WiT_ EIiHER
ACCESSOR7ROOFCURB
_OL7 HEA_S I0 BE ON INSIDE OP ELANGE
CIEARA_CE ]S II_] 0 0-_I_" TY? ALl CORNERS
i DIRECT[ON OF A]RFLO_
__P[_ING FOR
SEE NOTE 9_
SERVICE
TE
NOTE 7 &8
SEE NOTE 2

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
_revent rigging straps from damaging unit.
Fig. 2 -- 48PG Rigging Label
Step 4 -- Field Fabricate Ductwork-- On vel_ical
units, secure all ducts to roof crab and building structure. Do not
connect dm_'ork to unit. For horizontal applications, field-
supplied flanges should be attached to horizontal dischtuge
openings and all ductwork secmed to the flanges. Insulate and
weatherproof all external ductwork, joints, and roof openings
with counter flashing and mastic in accor&mce with applicable
codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor bturiel:
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with applica-
ble fire codes.
A minimum clearance is not required around ductwork.
Cabinet return-air static pressure (a negative condition) shall
not exceed 0.35 in. wg with economizer or 0.45 in. wg without
economizel:
These units are designed for a minimum continuous return-
air temperature in heating of 50 F (dry bulb), or an intermittent
operation down to 45 F (diy 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 E Indoor com-
fort may be compromised when these lower air temperatures
are used with insufficient heating temperature rise.
Step 5 -- Make Unit Duct Connections
VERTICAL SUPPLY/RETURN CONFIGURATION -- Unit
is shipped in vertical supply/return configuration. Ductwork
openings are shown in Fig. 1and 3. Attach the ductwork to the
roof curb. Do not attach duct directly to the unit.
For venic_d supply and return units, tools or pans could
&op into ductwork and cause an injmy. Install a 90-degree
turn in the return ductwork between the unit and the condi-
tioned 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 SUPPLY/RETURN APPLICATIONS -- Unit
can be field-converted from vertical supply/return to horizontal
supply/return. Remove all screws securing horizontal duct
covers to duct panel. Save panels. Install duct covers in the
vertical duct openings in the basepan with the insulation side
up. Covel.s will drop into openings and can be secured using
field-supplied self-tapping screws. Ductwork can be attached
to duct flanges provided on unit. When securing ductwork to
unit, do not drill in area below bead or above top edge of duct
opening.

BASE UNIT 48PC
NOMINAL CAPACITY (Tons)
OPERATING WEIGHT (]b)
Unit*
Economizer
Vertical
Horizontal
Roof Curb
14-in.
24-in.
COMPRESSOR
Quantity
Oil Type
Number of Refrigerant Circuits
Oil (oz)
REFRIGERANT TYPE
Expansion Device
Operating Charge (Ib)
CONDENSER COIL
Condenser A (Outer)
Rows-.Fins/in.
Face Area (sq ft)
Condenser B (inner)
Rows-.Fins/in.
Face Area (sq ft)
CONDENSER FAN
Quantity.- Diameter (in.)
Nominal Cfm (Total, all fans)
Motor Np
Nominal Rpm -- High Speed
Nominal Rpm -- Low Speed
EVAPORATOR COIL
Rows...Finslin.
Face Area (sq ft)
EVAPORATOR FAN
Quantity._ Size (in.)
Type Drive
Nominal Cfm
Maximum Continuous Bhp
Motor Nominal Rpm
Motor Frame Size
Fan Rpm Range
Motor Bearing Type
Maximum Fan Rpm
Motor Pulley Pitch Diameter Range (in.)
Fan Pulley Pitch Diameter (in.)
Nominal Motor Shaft Diameter (in.)
Belt...Pitch Length (in.)
BelL.Type
Pulley Center Line Distance Min. (in.)
Pulley Center Line Distance Max. (in.)
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full
Turns from Closed Position
Factory Pulley Betting (rpm)
Fan Shaft Diameter at Pulley (in.)
GAS HEAT SECTION
Rollout Switch
Open Temperature (F)
Closed Temperature (F)
Standard Units
Gas Input (Btuh) Stage l/Stage 2
Low NOx Units
Burner Orifice Diameter (in....drill size)**
Natural Gas
Liquid Propane
Thermostat Heat Anticipator Setting (amps)
First Stage
Second Stage
Manifold Pressure (in. wg)
Natural Gas
Liquid Propane
Gas Valve Quantity
Gas Supply Pressure Range (in. wg)
Field Gas Connection Size (in.)
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
LOW-PRESSURE SWITCH (psig)
Cutout
Reset IAuto.)
FREEZE PROTECTION THERMOSTAT (F)
Cutout
Reset (Auto.)
RETURN-AIR FILTERS
Quantit_L..Size lin.l
LEGEND
TXV -- Thermostatic Expansion Valve
_Aiuminum evaporator coil/aluminum condenser coil
tSingle phase/three phase.
_For applications less than 2000 ft elevation.
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
LOW
High
Low
High
Low
High
Low
High
Low
High
Low
Med
High
Low
Med
High
PGDtL
PGEtM
PGF/N
PGDtL
PGEtM
PGF/N
Table 1 -- Physical Data
03 04 07
2 3 6
774 786 961
40 40 40
50 50 50
122 122 122
164 184 164
1I I 1
1 I I 138 56
T×V I I TXV7.3 19.0
1...17 I2...17
12.6 12.6
-- 2...17
-- 12.6
1...24 I 1...24
3500 [ 4500
1/8 1/4
825 1100
300 300
2...1598I I 4...159.8
1...12x 9
1...12x 9
Belt
Belt
8OO
0.85
0.85
1620
48Y
48Y
482-736
656-1001
Ball
2000
1.9-2.9
1.9-2.9
6.8
5.0
1/2
49.3
49.3
AX
AX
16.2
16.2
20.2
20.2
48
65
5
5
736
794
3/4
N/A
N/A
195
N/A
N/A
115
56,000
56,000
0.0820...45
0.0650...52
0.3
0.4
3.5
3.5
1
5.0-13.0
1/2
111112x 9
111112x 9
Belt
Belt
2400
2.40
3.10
1725
56Y
56Y
796-1128
1150-1438
Ball
2000
2.4-3.4
4.0-5.0
5.2
6.0
5/8
7/8
49.3
52.3
AX
AX
16.2
16.2
20.2
20.2
66
58
5
5
1128
1323
3/4
195
225
195
115
175
115
05 06
4 5
901 921
40 40
50 50
122 122
184 184
Fully Hermetic Scroll
1I1I1
Copeland 3MA
1I1I142 42 66
R-410A (Puron® Refrigerant)
T×V I TXV I TXV9.0 15.7 16.6
Enhanced Copper Tubes, Aluminum Lanced Pins
1...17 [ 2...17 [ 2...17
12.6 12.6 12.6
1...17 2...17 2...17
12.6 12.6 12.6
P_peller
1...24 [ 1...24 [ 1...24
3500 3500 4500
1/8 1/8 1/4
825 825 1100
300 300 300
Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Face Split
2...1598I 2...159.8 I 8...159.8
Centrifugal Type, Belt Drive
1...12x 9 1...12x 9 1...12x 9
1...12x 9 1...12x 9 1...12x 9
Belt Belt Belt
Belt Belt Belt
1200 1600 2000
0.85 0.85 0.85_.40t
0.85 1.60_.40t 1.60_.40t
1620 1620 1725
48Y 48Y 56Y
48Y 56Y 56Y
482-736 596-910 690-978
796-1128 828-1173 929-1261
Ball Ball Ball
2000 2000 2000
1.9-2.9 1.9-2.9 2.4-3.4
2.4-3.4 2.4-3.4 2.8-3.8
6.8 5.5 6.0
5.2 5.0 5.2
l& 1/2 s/8
1/2 5/8 s/8
49.3 49.3 49.3
49.3 49.3 49.3
AX AX AX
AX AX AX
16.2 16.2 16.2
16.2 16.2 16.2
20.2 20.2 20.2
20.2 20.2 20.2
48 59 58
62 69 66
555
555
736 910 978
929 1035 1128
s/4 s/4 s/4
195 195 195
195 195 225
225 225 195
115 115 115
115 115 175
175 175 115
39,200/ 56,000 39,200/ 56,000 52,500/ 75,000
52,500/ 75,000 52,500/ 75,000 79,100/113,000
79,100/113,000 79,100/113,000 105,700/151,000
56,000 56,000 75,000
75,000 75,000 113,000
113,000 113,000 151,000
0.0820...45 0.0820...45 0.0820...45
0.0650...52 0.0650...52 0.065...52
0.3 0.3 0.3
0.4 0.4 0.4
3.5 3.5 3.5
3.5 3.5 3.5
111
5.0-13.0 5.0-13.0 5.0-13.0
1/2 1/2 1/2
660 ± 10 660 ± 10 660 ± 10
505 ± 20 505 ± 20 505 ± 20
40±7 40±7 40±7
80±7 80±7 80±7
30±5 30±5 30±5
45±5 45±5 45±5
Th_waway Type
4...15 x 20 x 2 [ 4...15 x 20 x 2 [ 4...15 x 20 x 2
52,500/ 75,000
79,100/113,000
105,700/151,000
0.0820...45
0.065...52
0.3
0.4
3.5
3.5
1
5.0-13.0
1/2
4...16 x 20 x 2 [ [ 4...16 x 20 x 2
660± 10 660± 10
505 ± 20 505 ± 20
40±7 40±7
80±7 80±7
30±5 30±5
45±5 45±5

NOTES:
1. Do not locate adjacent units with flue discharge
facing economizer inlet.
Minimum clearances to be:
• Front 48 in. to combustible surfaces (18 in. to
combustible surfaces when using accessory flue
discharge deflector). When not using roof curb
(1 in.) bottom of base pan to combustible sur-
faces• When not using roof curb (0 in.) bottom of
base rail to combustible surfaces.
• Right side, front and back sides (36 in.) for
proper condenser airflow•
• Overhead (60 in.) to assure proper condenser
airflow between unit and control box (42 in. per
NEC [National Electrical Code[)•
• Between units and ungrounded surface control
box side (36 in. per NEC).
• Between unit and block or concrete wall and
other grounded surfaces control box side 42 in.).
• Horizontal supply and return, (0 in.).
2. Downshot ducts designed to be attached to acces-
sory roof curb only. If unit is mounted side supply,
it is recommended the ducts must be supported by
cross braces as done on accessory roof curb.
3. With the exception of clearance for the condenser
coil, combustible surfaces, and the damper/power
exhaust as stated in Note 1, a removable fence or
barricade requires no clearance.
4. Dimensions are from outside of base rail. Allow
0-5/16[8] on each side for top cover drip edge.
5. Units may be installed on combustible floors made
from Class A, B, C roof covering material if set on
base rails.
LEGEND
Center of Gravity
IP Direction of Airflow
9/4" D[A
STD UNIT
UNIT WEIGHT
48PG Ib kg
03 774 351
04 786 357
05 901 409
06 921 418
07 961 436
(A) (B) (C)
CORNER WEIGHT CORNER WEIGHT CORNER WEIGHT
Ib kg Ib kg Ib kg
170.1 77.1 142.3 64.5 210.3 95.4
172.7 78.3 144.5 65.5 213.5 96.8
198.0 89.8 165.7 75.2 244.8 111.0
202.4 91.8 169,4 76.8 250.2 113.5
211.2 95.8 176.7 80.2 261.1 118.4
5-5/15"
134 6
POWER SUPPLY
KNOCKOUT
(THRU CURB)
4-15/16 _
1252
] "-s 3/4"
450 S
11 I I
tURN AIR illllh " OPENINGSUPPLYAIR I'-9-914"
_NING 553 o
tTICAL II II ih VERTICAL
SnSnR.iiII ih I I 1
7070 [------
_,_rONOENSER ACCESS
CLEANOUT PANEL
RiO NOT DRILL
REAR 1' 8 578"
1524 OI
SCALE 9:32
5"114"
t13D 9] _1
S-S/16"
[84 21
4-15/16"
[125 51
1"-2-3/8'
13_521
4"-5-15/i6"
CON[TENSER COIL
1'"R'1/4"
136211
'\ 16::[3
1/2" 14 GAS
CONNECTION
-RIGHT
SIDE
(D)
CORNER WEIGHT
Ib kg
251.3 114.0
255.2 115.8
292.5 132.7
299.0 135.6
312.0 141.5
ACCESS
ROVER
5-1/R"
0'-i-1/8"
289
t
3"-r
in
Fig. 3 -- Base Unit Dimensions

Step 6 -- Install Flue Hood and Inlet Hood --
Flue hood (smaller hood), inlet hood (Ireget hood), and screens
are shipped inside the unit in the gas section. To install, open
the heat section dool: The flue hood is attached to the heat
section panel from the outside using file screws provided. See
Fig. 4 and 5.
The inlet hood is installed by inserting the hood through the
back of the heat panel. Attach the hood by inserting file screws
provided through the clearance holes in the heat panel and into
the intake hood.
NOTE: When properly installed, the flue hood will line up
with the combustion fan housing. See Fig. 6.
"_'INLET
HOOD
GAS SECTION FLUE
ACCESS DOOR HOOD
Fig. 4 -- Flue and Inlet Hood Locations
II =_IM
J_
• " i
l/_ _ _
/
HEAT EXCHANGER
SECTION MAIN BURNER SECTION
INDUCED
J DRAFT
MOTOR
-COMBUSTION
FAN HOUSING
"MAIN GAS
VALVE
Fig. 6 -- Typical Gas Heating Section
CONTROLBOX
AND COMPRESSOR
ACCESS DOOR
ELECTRICAL
OPTIONS PANEL INDOOR MOTOR
ACCESS DOOR
OUTDOOR
AIR
SCREEN
(HIDDEN)
CONDENSERCOIL
ACCESS PANEL
ECONOMIZER
HOOD
BAROMETRIC
RELIEF DAMPER
HOOD FILTER ACCESS DOOR
BABEPAN CONNECTIONS
ACCESS PANEL
Fig. 5 -- Panel and Filter Locations
GAS SECTION
ACCESS DOOR

Step 7 -- Install External Trap for Condensate
Drain -- The unit's 3h-in. condensate drain connections am
located on the bottom and side of file unit. Unit discharge
connections do not determine the use of drain connections;
either &ain connection can be used with vertic;d or horizontal
applications. See Fig. 3 for locations.
When using the standmd 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 &'ain connection for a roof curb installa-
tion, relocate the factory-installed plug (red) fiom the bottom
connection to the side connection. A q2-in, socket extension
can be used to remove the plug. See Fig. 7. The piping for the
condensate &ain and extern;fl trap can be completed after the
unit is in place.
All units must have an external trap for condensate drain-
age. Install a trap at least 4-in. deep and protect against freeze-
up. If drain line is installed downstremn from the external trap,
pitch the line away fi_m 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 48PG units are provided with a removable condensate
pan for ease of cleaning. Refer to Cleaning section on page 37
for more information. It is recommended that a union be placed
between the unit and condensate drainage to ease the removal
of file pan during servicing. Adequate cle;uance should be
allowed if removal of condensate pan is required. Allow 54-in.
between condensate pan access panel and any obstruction for
complete removal.
ONEJN.PER BASE I I I IL_
lOFT OFUNE X RAIL --l--]_...J/t
\OPEN 2" MINI [ III
\VENT I I I III
TDOFIRINO_F" "_--I
1===4 DRAIN PLUG
_F-
SEE
NOTE
t
,w_ROOF
CURB
NOTE: Trapshould be deep enough to offset maximum unit static
difference.A 4-in.trap is recommended.
Fig. 9- Condensate Drain Piping Details
SIDE DRAIN
PLUG
Fig. 7 -- Condensate Drain Pan
BOTTOM DRAIN
PLUG
CONDENSATE
PANACCESS
PANEL
OPTIONAL UNIONS
TO ALLOW FOR CONDENSATE
PAN REMOVAL
Fig. 8 -- External Trap for Condensate Drain

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 Z223.1-1atest year and
addendum Z223.1A-latest year entitled HFGC. In Canada, in-
stallation must be in accordance with the CANI.BI49.1 and
CAN 1.B 149.2 installation codes for gas burning appliances.
Support gas piping as shown in the table in Fig. 10. For
example, a JV4-in. gas piping must have one field-fabricated
support beam every 8 11. Therefore, an 18-1l long gas pipe
would have a minimum of 3 support beams. See Fig. 10 for
typical pipe guide and locations of external manual gas shutoff
valve.
Install field-supplied manu_fl gas shutoff valve with a l/8-in.
NPT pressure tap for test gage connection at unit. The pressure
tap is located on the gas manifold, adjacent to the gas v_flve.
Field gas piping must include sediment trap and union. See
Fig. 11. Inst_dl a field-supplied gas regulatol:
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing. Damage to
equipment or personal injury may result.
,m X _'1
GAS I
{' I'MANUALaASREGU TOR*I
/ BASEUNI T _J_TOFF VALVE* ,_
.......................................I}1
T-q T OR,P E PERNFGC*
B sE+L ]i '-"OO CUR /
FIELD-FABRICATED
SUPPORT*
FROM GAS METER
LEGEND
NFGC -- National Fuel Gas Code
*Field supplied.
NOTE: Follow all local codes.
STEEL PIPE NOMINAL I SPACING OF SUPPORTS
DIAMETER (in.) I X DIMENSION (ft)
1/2 6
3/4 or 1 8
11/4 or larger 10
Fig. 10 -- Gas Piping Guide (With Accessory
Thru-the-Curb Service Connections)
MANUAL SHUTOFF
(FIELD SUPPLIED) rq-i
fSUPPLY
PRESSURE TAP
(1/8" NPT PLUG)
UNIT UN]OL_'_N _ "+--'-- SEDIMENT TRAP
Fig. 11 -- Field Gas Piping
I IMPORTANT: Natural gas pressure at unit gas connection I
must not be less than 5.0 in. wg or greater than 13.0 in. wg I
for all heat sizes.
Size gas-supply piping for 0.5-in. wg maximum pressure
diop. Do not use supply pipe smaller than unit gas connection.
Step 9 -- Make Electrical Connections
FIELD POWER SUPPLY -- All 208/230-v units _u'e factory
wired for 230-v power supply. If the 208/230-v unit is to be
connected to a 208-v power supply, the transformer must be re-
wired by moving the black wire with the l/4-in, female quick
connector flom the 230-volt connection and moving to
the 200-volt l/4-in, male termimd on the primary side of the
transformel:
Refer to unit label diagram for additional information. All
field wiring must comply with NEC (National Electrical Code)
tuld local codes. Size wire based on MCA (Minimum Circuit
Amps) on the unit informative plate. Leads are provided for
field wire connections. Use UL (Underwriters' Laboratories)
approved copper/aluminum connectol:
When installing units, provide safety disconnect per NEC
Article 440 or local codes. For non-fused disconnects, size the
disconnect according to the sizing &_ta provided in the electri-
cal data tables. Ifa lilsed disconnect is used, determine the min-
imum size for the switch based on the disconnect sizing data
provided in the electric:d data tables and then coordinate the
disconnect housing size to accommodate the Maximum Over-
current Protection (MOCP) device size as maned on the unit
infonnative plate. See Tables 2A and 2B.
See Fig. 12 for power wiring connection to 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. 12. Factory leads may be wired
directly to the disconnect.
The correct power phasing is cdtic:d to the operation of the
scroll compressors. An incorrect phasing will result in
compressor shutdown on thermal overload and possible
&_mage to compressol: Should this occm; power phase cor-
rection must be made to the incoming powec
Unit cabinet must have an uninterrupted, unbroken electri-
cal ground to minimize the possibility of pel_onal injury if
an electrical fault should occm: This ground may consist of
electric_d wire connected to unit ground lug in control com-
partment, or conduit approved for electrical ground when
installed in accor&mce with NEC; ANSI/NFPA (National
Fire Protection Association), latest edition, and local elec-
triced 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.
Field winng 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
&image to electrical components.

----I I
I
ow
coo-
E_
I
r
I
I
I--
I
I
FIELD FACTORY
POWER _ POWER
WIRING _ WIRING
C.A1
EQUIP GND
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.
Fig. 12- Field Power Wiring Connections
FIELD CONTROL WIRING -- Unit can be controlled with
a Carrier-approved accessory themlostat. Install thermostat ac-
cording to the installation instructions included with accessory.
[x_cate thermostat assembly on a solid interior wall in the con-
ditioned space to sense average temperature.
Route thermostat cable or equiv_dent single leads of colored
wire from subbase temlinals through conduit into unit to low-
voltage connections as shown on unit label wiring diagram and
in Fig. 13.
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.
Set heat anticipator settings as follows:
STAGE 1 STAGE 1 AND 2
VOLTAGE (W1) ON (Wl AND W2) ON
All 0.3 0.4
Settings may be changed slightly to provide a greater degree
of comfort for a particular installation.
TB1
THERMOSTAT ASSEMBLY
REMOVABLE JUMPER
j_ IIIIIII
Fig. 13- Field Control Thermostat Wiring
10