Carrier 48PD05 User manual

Irn ®
to the Expertg
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 and
ComfortLink "_ 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 injury
or equipment damage,
Puron ® (R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems, Do not use R-22
service equipment or components on Puron refrigerant
equipment,

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 any
phone in your building.
3. IMMEDIATELY call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
4. If you cannot reach your gas supplier, call the fire
department.
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 linfits
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 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 covering
material. Carrier roof curb accessories are for flat roofs or slab
mounting.
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasket with the roof curb as shown in
Fig. 1. Improperly @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 equipment
damage.
All panels nmst be in place when rigging. []nit is not
designed 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.

t
R,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 , t
1 '-3-15/16 :'
[39611 0 3"
INSIDE [7621
!
]-Y/S"
[47 6]
TYP
[5924] _ _-_ [34443
F
RETURN A1R _
OPENING 0-7-Y/_6"
[1883]
t j
2" 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 FOR
ELECTRICAL
SERVICE
'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 CURB
48PG, 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 DUCT
REST ON CURD)
6 SERVICE CLEARANCE 4 H ON EACH SIDE
GAS SERVICE PIATE IS PART OF A SEPARATELY
SNIPPED 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 EITHER
ACCESSORY ROOFCURB
BOIT HEADS TO BE ON INSIDE OF FLANGE
CLEARANCE 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) UNIT
WITH ALUMINUM COiLS,AND STANDARD DRIVE
FOR WEIGHTS Oi OP]IONAL EQUIPMENT CONSULT
PRODUCT DATA BOON
2 DO NOT LOCATE ADJACENT UNITS WiTH FLUE DISCHARGE
FACING ECONOMIZER INLET
3a MINIMUM CLEARANCE (LOCAL CODES OR JUSISD[CTiONS MAY PREVAIL):
FRONT 48 INCHES TO COMBUSTIBLE SURFACES (18 INCHES WHEN
USING ACCESSORY BLUE DISCHARGE DEFLECTOR)
b WHEN NO" USING ROOF CURB (I INCH) BOTTOM OF BASE DAN TO
COMBUSTIBLE 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 [IB4BI
CONDENSER AIRFLOW
d OVERHEAD (60 INCHES) TO ASSURE PROPER CONDENSER AIRFLOW
e 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 OTHER
GROUNDED 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 SiDE
FOR 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 AS
S_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
T
2' 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 CONDENSATE
DRA]N 314" 14 NPT
5BIB"
[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 B5/B"
{2255] T
_ I X _ALT GAS I
(INCLUDED WITM UNIt) 2"-1-7/16"
B' 37!8" _ [B456]
_- 110148] _ AIR iNTAKE I
3" B 5/16" HOOD
{10741] (INCLUDED
8' 10 11/16" WITH UNIT) I
[27089] 4
DO NOT
AREA BELOW
STD UNIT CORNER i CORNER CORNER CORNER
UNI WEIGHT WEIGHT (A):WEIGHT (B) WEIGHT (C) WEIGHT (D)
LBsiNG ND LBBiNG LBS NG
48PGO3 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 !
\
CONDENSATE
ACCESS
_COVER
i i
[ 5 i/B"
{139 5]
B !/8"
[79 6]
OUTSIDE
PANEL
I" B BIB"
[365 2]
NACR DREAMER
IOPTIONS)
2' 4:1/16"
5-1/2"
[iBgB] [333333
2" 1-15/1B"
{6B86}
B-9/16" _ 4'-0o11/16 '<
{641] [12371]
INSIDE RAILS
LEFT
SIDE
(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 iL
BAROMETRIC REU[EF MOOD X_ [2889 _ _ .... _ t--,E:-....... RIGHT
(INCLUDED W TH UNIT) _ N x ACCESS DOOR
PW_ 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 _2
INS:DE RAILS oo
Fig. 2 -Base Unit Dimensions
CO8493

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.
UNIT IA[B[C[D[ E [ MAX. WEIGHT
\o
DE;AlL A._/_Lr_t. I _ g _ UNIT ON ROOF CURB
DET IL fA __--_ _ J__DUCT END
Fig. 3 - Rigging Label
C08433
Positioninu
Maintain clearance, per Fig. 2, around and above unit to provide
minimum distance from combustible materials, proper airflow, and
service access.
Do not install unit in an indoor location. Do not locate air inlets
near exhaust vents or other sources of contaminated air. For proper
unit operation, adequate combustion and ventilation air must be
provided in accordance with Section 5.3 (Air for Combustion and
Ventilation) of the National Fuel Gas Code, ANSI Z223.1
(American National Standards Institute).
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
Locate mechanical draft system flue assembly at least 4 fl from any
opening through which combustion products could enter the
building, and at least 4 fl from any adjacent building (or per local
codes). Locate unit at least 10 fl away from any adjacent unit.
When unit is located adjacent to public walkways, flue assembly
must 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 perimeter
curb. Correct placement of the unit onto the curb is critical to
proper 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 2 to assure proper duct opening alignment.
NOTE: Before positioning unit onto curb, refer to Step 6 - Install
External 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 may
result.
Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends aminimum of 6-in.
beyond unit cabinet. Install a gravel apron in front of
condenser-coil air inlet to prevent grass and foliage from
obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb, if
required.
/

Table 1 -Physical Data (Cooling)
BASE UNIT 48PD
NOMINAL CAPACITY (Tons)
OPERATING WEIGHT (Ibs)
Unit*
Economizer
Vertical/Horizontal
Roof Curb
14-in./24-in.
REFRIGERANT SYSTEM
Refrigerant
Metering Device
#Circuits/# Compressors
Charge (Ibs)
High Pressure Switch Cutout (psig)
High Pressure Switch Auto Reset (psig)
COMPRESSOR
Oil Type
Oil (oz)
CONDENSER COIL
Circuit
Rows/FPI
Face Area (sq ft)
CONDENSER FAN (type)
Quantity/Diameter (in.)
Nominal Cfm (Total, all fans)
Motor Hp/Watts
Nominal Rpm
EVAPORATOR COIL
Standard Coil Tube/Fins
Rows/FPI
Face Area (sq ft)
Condensate Drain Connection Size (in.)
EVAPORATOR FAN (See motor and drive tables)
Fan Quantity/Type
Belt Size (in.)
Blower Pulley Type
Fan Bearing Type
Maximum Fan RPM
FILTERS
Unit Filter Type
Unit Filter Qty/Size (in.)
Economizer OA Inlet Screen Qty/Size (in.)
05
4
901
40/50
122/184
Puron(s) (R-410A) Refrigerant
Balanced- 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/AI
2/15
9.3
3/4 NPT
1/Belt
12x9
Fixed
Ball - Concentric Lock
2000
Copeland Digital Scroll
Copeland 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/AI
3/15
9.3
3/4 NPT
Fiberglass fill, non-pleated
4/16x20x2
1/25.8 x 16.4
1/Belt
12x9
Fixed
Ball - Concentric Lock
2000
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 Valves
Gas Supply Line Pressure Range (in. wg)
Gas Supply Line Pressure Range (PSIG)
Manifold Pressure
Natural 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- PDunit does not support the use of conventional Y1/W1thermostat
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 460
LOW STATIC DRIVE OPTION
Motor HP 2.4 2.4
Motor Nominal RPM 1725 1725
Maximum Continuous BHP 2.0 2.0
Maximum Continuous Watts 2000 2000
Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8
Motor Pulley Pitch Diameter Min - Max (in) 1.9 - 2.9 2.4 - 3.4
Fan RPM Range 598-910 890-978
Blower Pulley Pitch Diameter (in.) 5.5 8.0
Pulley center line distance (in.) 18.2-20.2 18.2-20.2
Belt Quantity /Type /Pitch Length (in.) 1 /AX48 /49.3 1 /AX48 /49.3
Speed change per turn - moveable pulley (RPM) 83 58
Moveable pulley maximum full turns 5 5
Factory Speed setting (RPM) 598 890
HIGH STATIC DRIVE OPTION
Motor HP 2.4 2.4
Motor Nominal RPM 1725 1725
Maximum Continuous BHP 2.0 2.0
Maximum Continuous Watts 2000 2000
Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8
Motor Pulley Pitch Diameter Min - Max (in) 2.4 - 3.4 2.8 - 3.8
Fan RPM Range 828-1173 929-1281
Blower Pulley Pitch Diameter (in.) 5.0 5.2
Pulley center line distance (in.) 18.2-20.2 18.2-20.2
Belt Quantity /Type /Pitch Length (in.) 1 /AX48 /49.3 1 /AX48 /49.3
Speed change per turn - moveable pulley (RPM) 89 87
Moveable pulley maximum full turns 5 5
Factory 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 480
LOW STATIC DRIVE OPTION
Motor HP 2.4 2.4
Motor Nominal RPM 1725 1725
Maximum Continuous BHP 2.0 2.0
Maximum Continuous Watts 2000 2000
Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8
Motor Pulley Pitch Diameter Min - Max (in) 1.9 - 2.9 2.4 - 3.4
Fan RPM Range 598-910 890-978
Blower Pulley Pitch Diameter (in.) 5.5 8.0
Pulley center line distance (in.) 18.2-20.2 18.2-20.2
Belt Quantity /Type /Pitch Length (in.) 1 /AX48 /49.3 1 /AX48 /49.3
Speed change per turn - moveable pulley (RPM) 83 58
Moveable pulley maximum full turns 5 5
Factory Speed setting (RPM) 598 890
HIGH STATIC DRIVE OPTION
Motor HP 2.4 2.4
Motor Nominal RPM 1725 1725
Maximum Continuous BHP 2.0 2.0
Maximum Continuous Watts 2000 2000
Motor Frame Size 58HZ 58HZ
Motor shaft diameter (in.) 5/8 5/8
Motor Pulley Pitch Diameter Min - Max (in) 2.4 - 3.4 2.8 - 3.8
Fan RPM Range 828-1173 929-1281
Blower Pulley Pitch Diameter (in.) 5.0 5.2
Pulley center line distance (in.) 18.2-20.2 18.2-20.2
Belt Quantity /Type /Pitch Length (in.) 1 /AX48 /49.3 1 /AX48 /49.3
Speed change per turn - moveable pulley (RPM) 89 87
Moveable pulley maximum full turns 5 5
Factory Speed setting (RPM) 828 929

Step 3-- Field Fabricate Ductwork
On vertical units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. For horizontal
applications, field-supplied flanges should be attached to
horizontal discharge openings and all ductwork secured to the
flanges. Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in accordance
with applicable codes.
Ducts passing through an unconditioned space must be insulated
and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be
ducted through the roof deck to comply with applicable fire codes.
A minimum clearance is not required around ductwork. Cabinet
return-air static 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 night
set-back thermostat.
To operate at lower return-air temperatures, a field-supplied
outdoor-air temperature control must be used to initiate both stages
of heat when the temperature is below 45°F. Indoor comfort may
be compromised when these lower air temperatures are used with
insufficient heating temperature rise.
Step 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 ° 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.
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.
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 are
shipped 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 FLUE
ACCESS 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 intake
hood.
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 Condensate
Drain
Fig. 6 - Typical Gas Heating Section
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. 2 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
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 the
MOTOR condensate drain and external trapcan be completed after the unit
-COMBUSTION is in place.
FANHOUSING 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 fl of run. Do not use a pipe size
MAIN 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 and
c06258 Troubleshooting book for more information. 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.
BOTTOM DRAIN
PLUG
SIDE DRAIN
PLUG
\\\\
\\\\\\\\\\\
\
C06233
Fig. 7 - Condensate Drain Pan
10