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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
GENERAL ......................................... 1
SAFETY CONSIDERATIONS ......................... 1
INSTALLATION .................................... 2
Step 1 - Provide Unit Support ......................... 2
Step 2 - Rig and Place Unit ........................... 2
Step 3 - Field Fabricate Ductwork ...................... 9
Step 4 - Make Unit Duct Connections ................... 9
Step 5 - Install Flue Hood and Inlet Hood ................ 9
Step 6 - Install External Trap for Condensate Drain ....... 10
Step 7 - Orifice Change ............................. 11
Step 8 - Install Gas Piping ........................... 12
Step 9 - Make Electrical Connections .................. 12
Step 10 - Install Outdoor-Air Hoods
(Units with Economizers) .......................... 16
Step 11 - Install All Accessories ...................... 16
Step 12 - Configure Controls ........................ 16
GENERAL
The 48PD rooftop unit uses Puron ® (R-410A) refrigerant andComfortLink "_ DDC controls. It is intended to be used in either a
displacement ventilation or a single-zone variable air volume
application, The unit includes a factory installed variable capacity
compressor and variable frequency drive indoor fan motor. This
manual provides instruction for installation of the unit, Refer to
the unit Controls and Troubleshooting book for additional
information on configuring controls.
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 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.
Recognize safety information. This is the safety-alert symbol /_.
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol.DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance operations on
unit, always turn off main power to unit.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in personal injuryor equipment damage,
Puron ® (R-410A) refrigerant systems operate at higherpressures than standard R-22 systems, Do not use R-22service equipment or components on Puron refrigerantequipment,
g
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
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 anyphone in your building.
3. IMMEDIATELY call your gas supplier from a
neighbor's phone. Follow the gas supplier'sinstructions.
4. If you cannot reach your gas supplier, call the fire
department.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
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: []nits have high ambient operating linfits. If linfitsare exceeded, the units will automatically lock the compressor outof operation. Manual reset will be required to restart thecompressor.
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 flmction properly.
[]nit 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 coveringmaterial. 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 @plied 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 non-combustible
surface. Support unit with sleepers, using unit curb support area. If
sleepers cannot be used, support long sides of unit with a nfinimum
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.
[]NIT DAMAGE HAZARD
Failure to follow this caution may result in equipmentdamage.
All panels nmst be in place when rigging. []nit is notdesigned for handling by fork truck.
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 -- 1/16-in. per linear ft in any direction. See Fig. 3 for
additional information and unit rigging weight.
tR,wR._iB.
[663 O]
INSIDE
1 '-6q/8"146061
0-3"[76.2]
J
0-3"[76 21
11 3/16" 1
[284 6] 1
t , t1 '-3-15/16 :'
[39611 0 3"INSIDE [7621
!
]-Y/S"[47 6]
TYP
[5924] _ _-_ [34443
F
RETURN A1R _
OPENING0-7-Y/_6"
[1883]
t j2" 3 5/i6"
_ i69441
4'-0-i/4"_ [!2244] _
OUTSIDE
\
0 l' D-7/16"
518 4]
3-7/8"[9841
SUPPLY AIR
OPENING 0-3' 6'_11-13/16"
7 [2128 1]OUTSIDE
E
1" 5/i6" I 1'-1-9/16"
0-6"
15 9]
OP NIND FORELECTRICALSERVICE
'IT.
SEE DETAIL
1/4"
6 41 "i_
DETAIL D
SCALE 11:32
CONNECTOR%" ACCESSORY
PACKAGE
03-OY 1/2" NPT CRDASPLIOOSASO
UN[F SIZE .A I, [ ROOF CURB48PG, PD ACCESSORY
I 1' 2'1 [356] / CRRECURDSROAOO$3-07 2" O:' [610] CRN[CURDDSRAOO
NOTES:I ROOP CURS ACCESSOR_ IS SHIPPED UNASSEMSLED
2 INSULATED _ANELS,
S DIMENSIONS IN [ ] ARE IN MILLIMETERS
4 ROOF CURS GALVANIZED STEEL
5 ATTACH DUCTWORNTO CURS (FLANGE6 ON DUCTREST ON CURD)
6 SERVICE CLEARANCE 4 H ON EACH SIDE
GAS SERVICE PIATE IS PART OF A SEPARATELYSNIPPED ACCESSORY PACKAGE
GASN_T_L NAIL
S' T/1D" [11]_
_COUNTER PLASHING(FIELD SUPPLIED)
ROOFING FELT
(FIELD SUPPLIED)
CANT STRIP
LD SUPPLIED)
ROOFiNG MATERIAL
(FIELD SUPPLIED)
RIGID INSULATION
(FIELD SUPPLIED)
TYPICAL 4 SIDES
3'-1 31/D2"GAS _ [964 3]
S[RVICE_ 0'-2 3/8
X rl610] [
I
1/2" 8
DE-AIL
SCALE 11:32
GAS SERVICE PLATE CAN S[ USED WITN EITHERACCESSORY ROOFCURB
BOIT HEADS TO BE ON INSIDE OF FLANGECLEARANCE IS [11] 0-0-7/i6" TYP ALL CORNERS
DIRECTION OF AIRPLOW
SEENOTE9 i _ICE
NOTE 7 & 8
SEE NOIE
Fig. 1 - Roof Curb Details
C08492
7
8
DiRECNiON OF AIR FLOW
NOTES:
I WEIGHIS SHOWN ARE FOR 48PG (HI HEAT) UNITWITH ALUMINUM COiLS,AND STANDARD DRIVE
FOR WEIGHTS Oi OP]IONAL EQUIPMENT CONSULTPRODUCT DATA BOON
2 DO NOT LOCATE ADJACENT UNITS WiTH FLUE DISCHARGEFACING ECONOMIZER INLET
3a MINIMUM CLEARANCE (LOCAL CODES OR JUSISD[CTiONS MAY PREVAIL):FRONT 48 INCHES TO COMBUSTIBLE SURFACES (18 INCHES WHENUSING ACCESSORY BLUE DISCHARGE DEFLECTOR)
b WHEN NO" USING ROOF CURB (I INCH) BOTTOM OF BASE DAN TOCOMBUSTIBLE SURFACES
c WHEN NOT USING ROOF CURB CO INCHES) TO BOTTOM OF BASE RAID 5 5116 '=
RIGHI SIDE,FRONT AND BACK SIDES (36 INCHES) EOR PROPER [IB4BICONDENSER AIRFLOW
d OVERHEAD (60 INCHES) TO ASSURE PROPER CONDENSER AIRFLOWe BETWEEN UNITS, CONTROL BOX SIDE, 42 IN PER NEC
f BETWEEN UNIT AND UNGROUNDED SURFACE CONTROL BOX SIDE(36 INCNES PER NED)
g BETWEEN UNI[ AND BLOCN OF CONCRETE WALL AND OTHERGROUNDED SURFACES CONTROL BOX SIDE (42 INCHES) PER NEC
k CLEARANCE IN FRONT OE INDOOR MOTOR ACCESS FOR BLOWER SLED
REMOVAL 4"6"i CLEARANCE FOR COMPL[[{ CONDENSATE PAN REMOVAL 4'6':
ON DNI-S W]-H ECONOMIZER ALLOW 3'6" FROM LENT SiDEFOR SERVICE ACCESS TO ECONOMIZER
m HORIZONTAL SUPPLY AND RETDRN,(O INCHES)
4 DOWN SHOT DUCTS DESIGNED TO BE ATTACHED TO ACCESSORY
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
5 D!MENSIONS IN { ] ARE IN MILLIMETERS OR KILOGRAMS
6 WiTH THE EXCEPTION OR CLEARANCE FOR THE DONDFNSER COl ,COMBUSTIBLE SURFACES AND THE DAMPER/POWER EXHAUST ASS_ATED IN NOTE N2 A REMOVABLE FENCE OR BARRICADE
REQUIRES NO CLEARANCE
DiMENSiONS ARE [ROM OUTSIDE 0[ BABE RAiL
ALLOW O" 5116 [8] ON EACH SIDE FOR TOP COVER DRiP EDGE
UNIIS MAY BE INSTALLED ON COMBUSTIBLE FLOORS WADE FROW
CLASS A,B,C ROOR COVERING MATERIAL IF SET ON BASE RAILS
CENTER OF GRAVITY
DISCONNECT
CONVENIENCE OUTLET
T2' B /2"
[67341
B/4" DIA [_9 1]-POWERSUPPLY
KNOCNOUT(THRU CURB)
1' B 1/16"
CORNER[_8s4!__6 w_u_'_'_
-- I_I _[:iToi: : --J
i RETURN AIRi
I OPENING 1
I V ERBT,I C6AL 1
[1066 8] I
.... J
i, ALT CONDENSATEDRA]N 314" 14 NPT
5 BIB"
[44T 9] r'_
SUPPLY AiR
OPENING I
VERTICAL I .
i
I' 11 l/B"
1596 O1
CORNERDI I - - H_- \ cOR_c l/ _ B 7/o:' _1 _ \ _ I B 5/B"
{2255] T
_ I X _ALT GAS I(INCLUDED WITM UNIt) 2"-1-7/16"
B' 3 7!8" _ [B456]
_- 110148] _ AIR iNTAKE I3" B 5/16" HOOD
{10741] (INCLUDED
8' 10 11/16" WITH UNIT) I
[27089] 4
DO NOTAREA BELOW
STD UNIT CORNER i CORNER CORNER CORNER
UNI WEIGHT WEIGHT (A):WEIGHT (B) WEIGHT (C) WEIGHT (D)
LBsiNG ND LBBiNG LBS NG48PGO3 774 i B51 170 77 1142 65 210 i 95 251 114
48PGO4 786 i 357 173 78 i145 66 2/4 i _'_ BBB
48PGO5 901 i 409 198 90 :166 75 245 i 111 293 133
921 I 418 202 92 1169 7T 250 i113 299 136
......9"61 I 436 211 95 i177 80 2611118, 3i2 i42
4BPOO5 901 _ 409 198 90 i166 75 245:111 293 i33
48PDO6 921 i 418 202 92 : 169 77 250 i 11B 299 136
DRAIN !
\
CONDENSATEACCESS_COVER
i i
[ 5 i/B"{139 5]
B !/8"[79 6]OUTSIDEPANEL
I" B BIB"[365 2]
NACR DREAMERIOPTIONS)2' 4:1/16"
5-1/2"[iBgB]
[333333
2" 1-15/1B"
{6B86}
B-9/16" _ 4'-0o11/16 '<
{641] [12371]
INSIDE RAILS
LEFTSIDE
(HOO E'Yii!D!:i£77 ' : :=...................m<;"B?'O' l: 7!.... O'U B",
k , /11:1-: tlt ', _;_,A 1-I1 CONDENSERcoin ,,Do, i
±_ ORUNIT / .,- 'b_k_" .'_=1==_,_"_ '_ . . , . . . r < c! / :363 1] '_
J_ /I '_ ]oo \, _ _: :::: 5:: _ LFy;;;;_: /_}u[,(: \ %::: \ V i L
BAROMETRIC REU[EF MOOD X_ [2889 _ _ .... _ t--,E:-....... RIGHT(INCLUDED W TH UNIT) _ N x ACCESS DOORPW_ XHA'T _ A _:OTRONO ,ll. _0 E US 2_ m COMPRESSOR '_ 4 15/16 '< _<
OPERATING POSITION _ RETURN ACCESS OOOR SUPPLY [117 8] _ DO_ORT:ON_ _s AIN' AIR FRONT SIDE _7' O SliD" _ SECTION A-A
L _sss _2INS:DE RAILS oo
Fig. 2 - Base Unit Dimensions
CO8493
Hook rigging shackles through holes in base rail, as shown inDetail 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.
UNIT I A [ B [ C [ D [ E [ MAX. WEIGHT
\oDE;AlL A ._/_Lr_t. I _ g _ UNIT ON ROOF CURBDET IL fA __--_ _ J__DUCT END
Fig. 3 - Rigging Label
C08433
Positioninu
Maintain clearance, per Fig. 2, around and above unit to provideminimum distance from combustible materials, proper airflow, andservice access.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents or other sources of contaminated air. For properunit operation, adequate combustion and ventilation air must beprovided in accordance with Section 5.3 (Air for Combustion andVentilation) of the National Fuel Gas Code, ANSI Z223.1(American National Standards Institute).
Although unit is weatherproof, guard against water from higherlevel runoff and overhangs.
Locate mechanical draft system flue assembly at least 4 fl from anyopening through which combustion products could enter thebuilding, and at least 4 fl from any adjacent building (or per localcodes). Locate unit at least 10 fl away from any adjacent unit.When unit is located adjacent to public walkways, flue assemblymust be at least 7 fl above grade.Roof Mount
Check building codes for weight distribution requirements, Unit
operating weight is shown in Table 1.
Installation On Roof Curb
The 48PD units are designed to fit on the accessory full perimetercurb. Correct placement of the unit onto the curb is critical toproper operating performance. To aid in correct positioning, placeunit on roof curb to maintain 1/4-in. gap between the inside of railand roof curb on long sides and a 1/2-in. gap between the inside ofrail and roof curb on both duct and condenser ends. Refer to Fig. 1and 2 to assure proper duct opening alignment.
NOTE: Before positioning unit onto curb, refer to Step 6 - InstallExternal Trap for Condensate Drain concerning bottom drain
connection plug.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit.
Do not slide unit into position when it is sitting on the curb.Curb gasketing material may be damaged and leaks mayresult.
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 ofcondenser-coil air inlet to prevent grass and foliage fromobstructing airflow.
NOTE: Horizontal units may be installed on a roof curb, ifrequired.
/
Table 1 - Physical Data (Cooling)
BASE UNIT 48PD
NOMINAL CAPACITY (Tons)OPERATING WEIGHT (Ibs)
Unit*Economizer
Vertical/HorizontalRoof Curb
14-in./24-in.REFRIGERANT SYSTEM
RefrigerantMetering Device# Circuits/# CompressorsCharge (Ibs)High Pressure Switch Cutout (psig)High Pressure Switch Auto Reset (psig)
COMPRESSOR
Oil TypeOil (oz)
CONDENSER COILCircuit
Rows/FPIFace Area (sq ft)
CONDENSER FAN (type)Quantity/Diameter (in.)Nominal Cfm (Total, all fans)Motor Hp/WattsNominal Rpm
EVAPORATOR COIL
Standard Coil Tube/FinsRows/FPI
Face Area (sq ft)Condensate Drain Connection Size (in.)
EVAPORATOR FAN (See motor and drive tables)Fan Quantity/TypeBelt Size (in.)Blower Pulley TypeFan Bearing TypeMaximum Fan RPM
FILTERS
Unit Filter TypeUnit Filter Qty/Size (in.)Economizer OA Inlet Screen Qty/Size (in.)
05
4
901
40/50
122/184
Puron(s) (R-410A) RefrigerantBalanced- Port TXV with Bypass
1/1
14.5
660-- -10
505 -- - 20
42
Outer/Inner
2/17
12.6
1/24
6500
0.125/227
825
Cu/AI2/159.3
3/4 NPT
1/Belt12x9Fixed
Ball - Concentric Lock2000
Copeland Digital ScrollCopeland 3MA
Round Tube Plate Fin
Propeller
Round Tube Plate Fin
Centrifugal
06
5
921
40/50
122/184
1/1
16.0
660-- -10
505 -- - 20
66
Outer/Inner
2/17
12.6
1/24
6500
0.25/651
1100
Cu/AI3/159.3
3/4 NPT
Fiberglass fill, non-pleated
4/16x20x2
1/25.8 x 16.4
1/Belt12x9Fixed
Ball - Concentric Lock2000
Fiberglass fill, non-pleated
4/16x20x2
1/25.8 x 16.4
Aluminum evaporator coil/Aluminum condenser coil with low heat
Table 2 - Physical Data (Heating)
BASE UNIT 48PD
GAS HEAT SECTION# of Gas ValvesGas Supply Line Pressure Range (in. wg)Gas Supply Line Pressure Range (PSIG)
Manifold PressureNatural Gas Vertical/Horizontal (in. wg)Liquid Propane Vertical/Horizontal (in. wg)
Thermostat Heat Anticipator Setting (amps)Field Gas Connection Size (in.)
Natural Gas
# of burners (total)
Rollout switch opens/closes (deg F)
Temperature Rise Min - Max (deg F)
Burner Orifice Diameter (in./drill size)**
# of burners (total)
Rollout switch opens/closes (deg F)
Temperature Rise Min - Max (deg F)
Burner Orifice Diameter (in./drill size)**
# of burners (total)
Rollout switch opens/closes (deg F)
Temperature Rise Min - Max (deg F)
Burner Orifice Diameter (in./drill size)**
Liquid Propane
_, # of burners (total)_[I
I Rollout switch opens/closes (deg F)
51 Temperature Rise Min - Max (deg F)QI-, Burner Orifice Diameter (in./drill size)**
,_l # of burners (total)
-' Rollout switch opens/closes (deg F)El_,! Temperature Rise Min - Max (deg F)
-_l Burner Orifice Diameter (in./drill size)**
_, # of burners (total)_[I
._ ! Rollout switch opens/closes (deg F)
_i Temperature Rise Min - Max (deg F).=[ Burner Orifice Diameter (in./drill size)**
** Forapplications less than 2000 ft elevation.1- PD unit does not support the use of conventional Y1/W1 thermostat
O5
1
5.0-13.0
0.1 80-- 0.469
3.50/3.50
3.50/3.50
NA1-
1/2
3
195/115
25-70
0.0820/45
4
195/115
20-60
0.0820/45
6
225/175
30-75
0.0820/45
3
195/115
25-70
0.0650/52
4
195/115
20-60
0.0650/52
6
225/175
30-75
0.0650/52
O6
1
5.0-13.0
0.180- 0.469
3.50/3.50
3.50/3.50
NAt
1/2
4
195/115
20-60
0.0820/45
5
225/175
30-75
0.0820/45
8
195/115
45-75
0.0820/45
4
195/115
20-60
0.0650/52
5
225/175
30-75
0.0650/52
8
195/115
45-75
0.0650/52
Table 3 - Fan and Motor Drive Data - Vertical Supply/Return
UNIT 48PD 05 08
VOLTAGE (volts) 208/230 and 460 208/230 and 460LOW STATIC DRIVE OPTION
Motor HP 2.4 2.4Motor Nominal RPM 1725 1725Maximum Continuous BHP 2.0 2.0Maximum Continuous Watts 2000 2000Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8Motor Pulley Pitch Diameter Min - Max (in) 1.9 - 2.9 2.4 - 3.4Fan RPM Range 598-910 890-978Blower Pulley Pitch Diameter (in.) 5.5 8.0Pulley center line distance (in.) 18.2-20.2 18.2-20.2Belt Quantity / Type / Pitch Length (in.) 1 / AX48 / 49.3 1 / AX48 / 49.3Speed change per turn - moveable pulley (RPM) 83 58Moveable pulley maximum full turns 5 5Factory Speed setting (RPM) 598 890
HIGH STATIC DRIVE OPTIONMotor HP 2.4 2.4Motor Nominal RPM 1725 1725Maximum Continuous BHP 2.0 2.0Maximum Continuous Watts 2000 2000
Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8Motor Pulley Pitch Diameter Min - Max (in) 2.4 - 3.4 2.8 - 3.8Fan RPM Range 828-1173 929-1281Blower Pulley Pitch Diameter (in.) 5.0 5.2Pulley center line distance (in.) 18.2-20.2 18.2-20.2Belt Quantity / Type / Pitch Length (in.) 1 / AX48 / 49.3 1 / AX48 / 49.3
Speed change per turn - moveable pulley (RPM) 89 87Moveable pulley maximum full turns 5 5Factory Speed setting (RPM) 828 929
Table 4 - Fan and Motor Drive Data - Horizontal Supply/Return
UNIT 48PD 05 08
VOLTAGE (volts) 208/230 and 480 208/230 and 480LOW STATIC DRIVE OPTION
Motor HP 2.4 2.4Motor Nominal RPM 1725 1725Maximum Continuous BHP 2.0 2.0Maximum Continuous Watts 2000 2000
Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8Motor Pulley Pitch Diameter Min - Max (in) 1.9 - 2.9 2.4 - 3.4Fan RPM Range 598-910 890-978Blower Pulley Pitch Diameter (in.) 5.5 8.0Pulley center line distance (in.) 18.2-20.2 18.2-20.2Belt Quantity / Type / Pitch Length (in.) 1 / AX48 / 49.3 1 / AX48 / 49.3
Speed change per turn - moveable pulley (RPM) 83 58Moveable pulley maximum full turns 5 5Factory Speed setting (RPM) 598 890
HIGH STATIC DRIVE OPTIONMotor HP 2.4 2.4
Motor Nominal RPM 1725 1725Maximum Continuous BHP 2.0 2.0Maximum Continuous Watts 2000 2000Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8Motor Pulley Pitch Diameter Min - Max (in) 2.4 - 3.4 2.8 - 3.8Fan RPM Range 828-1173 929-1281
Blower Pulley Pitch Diameter (in.) 5.0 5.2Pulley center line distance (in.) 18.2-20.2 18.2-20.2Belt Quantity / Type / Pitch Length (in.) 1 / AX48 / 49.3 1 / AX48 / 49.3Speed change per turn - moveable pulley (RPM) 89 87Moveable pulley maximum full turns 5 5Factory Speed setting (RPM) 828 929
Step 3 -- Field Fabricate Ductwork
On vertical units, secure all ducts to roof curb and buildingstructure. 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 pressure (a negative condition) shall not exceed
0.35-in.wg with economizer or 0.45-in.wg without economizer.
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 (dry bulb), such as when used with a nightset-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 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 2. Attach the ductwork to the
roof curb. Do not attach duct directly to the unit.
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 ° turnin 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.
Horizontal Supply/Return Applications
Unit can be field-converted from vertical supply/return tohorizontal 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.
Covers 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.
Step 5 -- Install Flue Hood and Inlet Hood
Flue hood (smaller hood), inlet hood (larger hood), and screens areshipped inside the unit in the gas section. To install, open the heat
section door. The flue hood is attached to the heat section panel
from the outside using the screws provided. (See Fig. 4 and 5.)
_ INLET
HOOD
GAS SECTION FLUEACCESS DOOR HOOD
Fig. 4 - Flue and Inlet Hood
C06257
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 intakehood.
NOTE: When properly installed, the flue hood will line up with
the combustion fan housing. (See Fig. 6.)
g
ELECTRICAL
OPTION_NEL
CONTROLEOX
AND
COMPRESSOR
\,
'\\
iNDOOR MOTOR
J ACCESSDOOR
SCREEN
(H_DDEN)
\\CONDENSER COIL
ACCESS PANEL
BASEPAN CONNECTIONS
ACCESS PANEL
Fig. 5 - Panel and Filter Locations
C06255
///
HEAT EXCHANGER
SECTION
Step 6 -- Install External Trap for CondensateDrain
Fig. 6 - Typical Gas Heating Section
The unit's 3/4-in. condensate drain connections are located on thebottom and side of the unit. Unit discharge connections do notdetermine the use of drain connections; either drain connection canbe used with vertical or horizontal applications. See Fig. 2 forlocations.
When using the standard side drain connection, make sure the plug(red) in the alternate bottom connection is tight before installing theunit. (See Fig. 7.)
To use the bottom drain connection for a roof curb installation,relocate the factory-installed plug (red) from the bottom
INDUCED connection to the side connection. A 1/2-in. socket extension can
/DRAFT be used to remove the plug. (See Fig. 7.) The piping for theMOTOR
condensate drain and external trap can be completed after the unit-COMBUSTION is in place.
FANHOUSING All units must have an external trap for condensate drainage. Installa trap at least 4-in. deep and protect against freeze-up. If drain lineis installed downstream from the external trap, pitch the line awayfrom the unit at 1-in. per 10 fl of run. Do not use a pipe sizeMAIN GAS
/ VALVE smaller than the unit connection (3/4-in.). (See Fig. 8 and 9.)'\,' The 48PD units are provided with a removable condensate pan for
MAINBURNERSECTION ease of cleaning. Refer to Maintenance section in Controls andc06258 Troubleshooting book for more information. It is recommended
that a union be placed between the unit and condensate drainage toease the removal of the pan during servicing. Adequate clearanceshould be allowed if removal of condensate pan is required. Allow54-in. between condensate pan access panel and any obstructionfor complete removal.
BOTTOM DRAINPLUG
SIDE DRAINPLUG
\\\\
\\\\\\\\\\\
\
C06233
Fig. 7 - Condensate Drain Pan
10
OPTIONAL UNIONSTO ALLOW FOR CONDENSATE --.._
PAN REMOVAL _
CONDENSATE
PAN ACCESSPANEL
Fig. 8 - External Trap for Condensate Drain
/
C06234
MINIMUM PITCHONE IN. PER BASE
10 FT OF LiNE \ RAiL
\\ OPEN
VENT __
TO ROOF I I _ _
DRAIN -- -
_=_ DRAIN PLUG
SEENOTE
_..ROOFI CURB
NOTE: Trap should be deep enough to offset maximum unit static difference.
A 4-in. trap is recommended.
Fig. 9 - Condensate Drain Piping Details
C06291
Step 7 -- Orifice Change
This unit is factory assembled for heating operation using natural
gas at an elevation from sea level to 2000 ft. This unit uses orifice
type LH32RFnnn, where "nnn" indicates the orifice size based ondrill size diameter in thousands of an inch.
High Elevation (Above 2000 It)
Consult the local gas utility company to deternfine if gas supply
has been de-rated for high altitude. If gas supply is not de-rated,
use accessory high altitude kit when installing this unit at an
elevation of 2000 to 7000 ft. For elevations above 7000 ft, refer to
Table 6 to identify the correct orifice size for the elevation. See
Table 7 for the number of orifices required for each unit size.
Purchase these orifices from your local Carrier dealer. Follow
instructions in accessory Installation Instructions to install thecorrect orifices.
Table 5 - Altitude Compensation*
ELEVATION (ft) NATURAL GAS ORIFICEt
O- 1,999 45
2,000 47
3,000 47
4,000 47
5,000 48
6,000 48
7,000 48
8,000 49
9,000 49
10,000 50
11,000 51
12,000 51
13,000 52
14,000 52
As the height above sea level increases, there is less oxygen per cubicfoot of air. Therefore, heat input rate should be reduced at higher altitudes.Includes a 4% input reduction per each 1000 ft.1- Orifices available through your Carrier dealer
Table 6 - Orifice Quantity
UNIT 3 4 5 6 7
Low Heat (D/L) -- 3 3 4 4
Medium Heat (E/M) -- 4 4 6 6
High Heat (F/N) 3 6 6 8 8
11
Conversion to LP Gas
Use accessory LP gas conversion kit when converting this unit for
use with LP fuel usage for elevations up to 7000 ft. For elevations
above 7000 fl, refer to Table 7 to identify the correct orifice size for
the elevation. See Table 6 for the number of orifices required for
each unit size. Purchase these orifices from your local Carrier
dealer. Follow instructions in accessory Installation Instructions toinstall the correct orifices.
Table 7 - LP Gas Conversion*
ELEVATION (ft) LP GAS ORIFICE 1
0-1,999 52
2,000 52
3,000 53
4,000 53
5,000 53
6,000 53
7,000 53
8,000 54
9,000 54
10,000 54
11,000 54
12,000 55
13,000 55
14,000 56
As the height above sea level increases, there is less oxygen per cubicfoot of air. Therefore, heat input rate should be reduced at higher altitudes.Includes a 4% input reduction per each 1000 ft.
1- Orifices available through your Carrier dealer
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.l-latest year
and addendum Z223.1A-latest year entitled HFGC. In Canada,installation must be in accordance with the CANI.BI49.1 and
CANI.BI49.2 installation codes for gas burning appliances.
Support gas piping as shown in the table in Fig. 10. For example, a
3/4-in. gas piping must have one field-fabricated support beam
every 8 ft. Therefore, an 18-ft 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 manual gas shutoff valve with a l/8-in. NPT
pressure tap for test gauge 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. 11.) Install
a field-supplied gas regulator.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not pressure test gas supply while connected to unit.
Always disconnect before servicing.
IMPORTANT: Natural gas pressure at unit gas connection must
not be less than 5.0-in. wg or greater than 13.0-in.wg for all heat
sizes. Size the gas-supply piping for 0.5-in.wg maximum pressure
drop. Do not use supply pipe smaller than unit gas connection.
F 9" MINIMUMcLEXRANCE
"'_AS_"'-UNI_"T_ 1 FOR PANEL REMOVAL L
I
DRIP LEG PER NFGCBASE ROOFCURB
FIELD-FABRICATEDSUPPORT*
FROM GAS METER
LEGEND
NFGC i National Fuel Gas Code
*Field supplied.NOTE: Follow all local codes.
SPACING OF SUPPORTS
STEEL PIPE SPACING OF SUPPORTSNOMINAL DIAMETER (in.) X DIMENSION (ft)
1/2 63/4or 1 8
11/4 or larger 1O
C06115
Fig. 10 - Gas Piping Guide (With Accessory
Thru-the-Cab Service Connections)
MANUALSHUTOFF
(FIELDSU GAS
PRESSURETAP(1/8" NPT PLUG)
_-- _ SEDIMENT TRAP
C06236
Fig. 11 - Field Gas Piping
12
Step 9 -- Make Electrical Connections
Field Power Supply
(For more details, refer to the Controls, Start-Up, Operation, andTroubleshooting manual).
All 208/230v units are factory wired for 230v power supply. If the208/230v unit is to be connected to a 208v power supply, the
transformers (TRANI and TRAN2) must be rewired by moving
the black wire with the l/4-in, female quick connector from the
230volt connection and moving to the 200volt l/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 (Underwriters
Laboratories) 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 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 9 and 10.)
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. 12 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. 2) to connections as shown on unit wiring
diagram and Fig. 12. Factory leads may be wired directly to thedisconnect.
[]NIT 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
alarm being generated and compressor operation lockout.
Should this occur, power phase correction must be made to
the incoming power.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
iniury or death.
Unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
iniury 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. Do not use gas piping as an electrical
ground.
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%.
[]nit failure as a result of operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause
damage to electrical components.
On"oLU
----II FIELD
IPOWER
I WIRING
rIII-II
POWER
C.A1
EQUIP GND
LEGEND
C.A1 -- Compressor Contactor (A1)
EQUIP -- EquipmentGND -- Ground
NEC -- National Electrical Code
NOTE: The maximum wire size for C.A1 is 2/0.
Fig. 12 - Field Power Wiring Connections
C06237
Field Control Wiring
Unit can be controlled with a Carrier-approved accessory space
temperature sensor. Install sensor according to the installation
instructions included with accessory. Locate space temperaturesensor on a solid interior wall in the conditioned space to sense
average temperature. The 48PD unit is not compatible with aconventional YI/WI thermostat.
NOTE: Use 20 AWG (American Wire Gauge) wire to connect the
sensor to the controller. The wire is suitable for distances of up to500 ft. Use a three-conductor shielded cable for the sensor and
set-point adjustment connections. The standard CCN
communication cable can be used. If the set-point adjustment
(slide bar) is not required, then an unshielded, 18 or 20 AWG
(American Wire Gauge), two-conductor, twisted pair cable can beused.
Route space temperature sensor cable or equivalent single leads of
colored wire from sensor terminals through conduit into unit to
low-voltage connections as shown on unit label wiring diagram
and in Fig. 13.
g
13
÷
LOOP POWERED(24vd¢)
I
!
III
I
I II I
oRHUMIDITY SENSOR OR HUMIDISTAT SPADE SENSOR
Fig. 13 - Low Voltage Terminal Board - Temperature and Humidity Control Wiring
C08434
Humidity Control
The 48PD unit can be used with a Carrier accessory humidistat
switch output (HL38MG029 or TSTATCCPLH01-B) in
conjunction with the space temperature sensor. The humidistat
switch is a normally open switch that closes upon a rise in space
humidity, above the setpoint value.
Upon a humidistat call, the supply air temperature is lowered to
produce a colder evaporator coil and lower dew point temperature.
When humidistat is satisfied, the supply air temperature is reset to
the original supply air temperature setpoint.
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. General humidistat and humidity sensor wiring
connections are shown in Fig. 13.
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.
14
NOMINAL VOLTAGE48PD POWER RANGEUNIT SUPPLYSIZE V-Ph-Hz Min Max
208/230-3-60 187 253
O5
460-3-60 414 506
208/230-3-60 187 253
06
460-3-60 414 506
Table 8 - Electrical Data - Units Without Optional Convenience Outlet
COMPRESSOR OFM COMBUST IFM POWER SUPPLYFAN Conv PWR
FLA MOTOR Outlet EXH
RLA LRA Qty (ca) FLA FLA TYPE FLA MCA MOCPI-
STD 5.2 26.3/26.3 40/40
ALT 5.2 26.3/26.3 40/4016.1 110 1 1.0 0.52 none
STD 5.2 27.7/27.7 40/401.4
ALT 5.2 27.7/27.7 40/40
STD 2.6 10.9 15
ALT 2.6 10.9 156.2 52 1 0.5 0.30 none
STD 2.6 11.5 150.6
ALT 2.6 11.5 15
STD 5.2 29.1/29.1 45/45
ALT 5.2 29.1/29.1 45/4517.9 110 1 1.5 0.52 none
STD 5.2 30.5/30.5 45/451.4
ALT 5.2 30.5/30.5 45/45
STD 2.6 13.2 20
ALT 2.6 13.2 207.8 52 1 0.8 0.30 none
STD 2.6 13.8 200.6
ALT 2.6 13.8 20
DISCONNECT
SIZE
FLA LRA
26/26 142/142
26/26 142/142
27/27 144/144
27/27 144/144
11 68
11 68
11 69
11 69
28/28 143/143
28/28 143/143
30/30 145/145
30/30 145/145
13 69
13 69
14 70
14 70
Table 9 - Electrical Data - Units With Optional Convenience Outlet
NOMINAL VOLTAGE48PD POWER RANGEUNIT SUPPLYSIZE V-Ph-Hz Min Max
208/230-3-60 187 253
O5
460-3-60 414 506
208/230-3-60 187 253
06
460-3-60 414 506
COMPRESSOR OFM COMBUST. IFM POWER SUPPLYFAN Conv PWR
FLA MOTOR Outlet EXHRLA LRA Qty (ca) FLA FLA TYPE FLA MCA MOCPI
STD 5.2 31.1/31.1 45/45
ALT 5.2 31.1/31.1 45/4516.1 110 1 1.0 0.52 YES
STD 5.2 32.5/32.5 45/451.4
ALT 5.2 32.5/32.5 45/45
STD 2.6 13.1 15
ALT 2.6 13.1 156.2 52 1 0.5 0.30 YES
STD 2.6 13.7 200.6
ALT 2.6 13.7 20
STD 5.2 33.9/33.9 50/50
ALT 5.2 33.9/33.9 50/5017.9 110 1 1.5 0.52 YES
1.4 STD 5.2 35.3/35.3 50/50
ALT 5.2 35.3/35.3 50/50
- STD 2.6 15.4 20
ALT 2.6 15.4 207.8 52 1 0.8 0.30 YES
0.6 STD 2.6 16.0 20
ALT 2.6 16.0 20
DISCONNECT
SIZE
FLA LRA
31/31 147/147
31/31 147/147
33/33 149/149
33/33 149/149
13 70
13 70
14 71
14 71
34/34 148/148
34/34 148/148
35/35 150/150
35/35 150/150
15 71
15 71
16 72
16 72
LEGEND
FLA - Full Load Amps
HACR - Heating, Air Conditioning and RefrigerationIFM - Indoor (Evaporator) Fan Motor
LRA - Locked Rotor Amps
MCA - Minimum Circuit AmpsMOCP - Maximum Overcurrent Protection
NEC - National Electrical Code
OFM - Outdoor (Condenser) Fan Motor
RLA - Rated Load Amps
t Fuse or Breaker
NOTES:
1. In compliance with NEC requirements for muttimotor and combination toad 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%. 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 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage = 224 + 231 + 2263
681
3
227
Determine maximum deviation from average voltage.
(AB) 227 224 = 3 v
(BC) 231 227 = 4 v
(AC) 227 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
4% Voltage Imbalance = 100 x
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.
15
Step 10 -- Install Outdoor Air Hoods
(Units With Economizer)
Perform the following procedure to install the outdoor-air hoods:
1. Economizer and barometric relief hoods are located in the
condenser section under the slanted coil for shipping. (See
Fig. 14.) Barometric relief/power exhaust hood is shippedinside of economizer hood. Remove screws that secure the
wooden rails of the hood assemblies to the unit. Save
screws. Slide complete assembly from condenser section.
2. Remove the screws that secure the economizer and
barometric relief/power exhaust hoods to the wooden
railing. Discard or recycle wooden rails. Save screws.
NOTE: The barometric relief damper is secured to the economizer
panel for shipping.
DO NOT THROW THIS PANEL AWAY!
3. Remove the screw holding the barometric relief damper to
the panel. Damper should be free to swing open during
operation. (See Fig. 15.)
DO NOT THROW THIS PANEL AWAY!
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. 15 and 16 0
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. 15 and 17 0
Step 11 -- 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 12 -- Configure Controls
Refer to unit Controls and Troubleshooting book for information
on configuring controls (including the VFD controller).
POWER EXHAUST////' BAROMETRIC
//RELIEF HOOD
WOODEN RAILS\_ ECONOMIZER
HOOD
C06290
Fig. 14 - Economizer and Barometric Relief/Power
Exhaust Hoods Shipping Position
ECONOMIZERHOOD
J
POWER EXHAUST/BAROMETRIC
RELIEF HOOD
/, \
/ \\
ECONOMIZER BAROMETRIC
PANEL RELIEF DAMPER SCREW
C06260
Fig. 15 - Hood Installation
MOUNTINGJ
FLANGE
POWER EXHAUST/BAROMETRICRELIEF HOOD
//
/
Fig. 16 - Barometric Relief/Power Exhaust
Hood Flange
C06262
MOUNTINGFLANGE
ECONOMIZERHOOD
F
Fig. 17 - Economizer Flange
C06263
Copyright 2008 Carrier Corp, • 7310 W, Morris St. • Indianapolis, IN 46231 Printed in U,S,A, Edition Date: 9/08
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations,
Catalog No:48PD-01SI
Replaces: NEW
16
