Carrier WeatherMaster 48HC Series User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480254-01 Printed in U.S.A. Form 48HC-4-6-03SI Pg 1 1-2020 Replaces: 48HC-4-6-02SI
Installation Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rated Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . 10
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . 10
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . 10
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . 12
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 12
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and Connect
Ductwork (When Required) . . . . . . . . . . . . . . . . . 13
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 14
• ECONOMIZER AND TWO POSITION DAMPER HOOD
PACKAGE REMOVAL AND SETUP (FACTORY
OPTION)
• ECONOMIZER AND TWO-POSITION HOOD
Step 9 — Units with Hinged Panels Only . . . . . . . . 15
Step 10 — Install Flue Hood . . . . . . . . . . . . . . . . . . . 15
Step 11 — Install Gas Piping . . . . . . . . . . . . . . . . . . 16
• FACTORY OPTION THRU-BASE CONNECTIONS
(GAS CONNECTIONS)
Step 12 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Step 13 — Make Electrical Connections . . . . . . . . . 19
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
• UNITS WITHOUT FACTORY-INSTALLED NON-
FUSED DISCONNECT OR HACR
• ALL UNITS
• CONVENIENCE OUTLETS
• HACR AMP RATING
• FACTORY-OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• UNITS WITHOUT THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• FIELD CONTROL WIRING
• THERMOSTAT
• HEAT ANTICIPATOR SETTINGS
• HUMIDI-MIZER® CONTROL CONNECTIONS
• LOW AMBIENT CONTROL (FACTORY OPTION)
• INTEGRATED GAS CONTROLLER
• COMFORTLINK (FACTORY OPTION)
• TYPICAL WIRING DIAGRAMS
Economi$er® X (Factory Option) . . . . . . . . . . . . . . .41
• SYSTEM COMPONENTS
• SPECIFICATIONS
•INPUTS
•OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• INTERFACE OVERVIEW
• SETUP AND CONFIGURATION
• ENTHALPY SETTINGS
• CHECKOUT
• TROUBLESHOOTING
PremierLink™ (Factory Option) . . . . . . . . . . . . . . . .51
RTU Open Controller (Factory-Installed Option) . .51
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
• COMPLETING RETURN AIR SMOKE SENSOR
INSTALLATION
• ADDITIONAL APPLICATION DATA
Step 14 — Adjust Factory-Installed Options . . . . . .53
• SMOKE DETECTORS
• ECONOMI$ER IV OCCUPANCY SWITCH
Step 15 — Install Accessories . . . . . . . . . . . . . . . . .53
Step 16 — Check Belt Tension . . . . . . . . . . . . . . . . .53
• BELT FORCE — DEFLECTION METHOD
• BELT TENSION METHOD
Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . .54
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the litera-
ture, tags and labels attached to the unit, and other safety precau-
tions that may apply.
Follow all safety codes, including ANSI (American National Stan-
dards Institute) Z223.1. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in in-
structions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. 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 hazards
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.
WeatherMaster®
48HC**04-06 Single Package Rooftop
Gas Heating/Electric Cooling Unit
with Puron®(R-410A) Refrigerant
Downloaded from ManualsNet.com search engine

2
WARNING
Electrical shock can cause personal injury and death. Shut off
all power to this equipment during installation. There may be
more than one disconnect switch. Tag all disconnect locations
to alert others not to restore power until work is completed.
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Disconnect gas piping from unit when pressure testing at pres-
sure greater than 0.5 psig (3450 Pa). 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 man-
ual gas valve(s).
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on R-410A refrigerant equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal injury or
death.
Relieve pressure and recover all refrigerant before system re-
pair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refriger-
ants and oils.
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing, safety glasses and gloves
when handling parts and servicing air conditioning equipment.
WARNING
CARBON-MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe personal
injury or death due to carbon-monoxide poisoning, if combus-
tion products infiltrate into the building.
Check that all openings in the outside wall around the vent
(and air intake) pipe(s) are sealed to prevent infiltration of
combustion products into the building.
Check that furnace vent (and air intake) terminal(s) are not ob-
structed in any way during all seasons.
AVERTISSEMENT
RISQUE D’INTOXICATION AU MONOXYDE DE
CARBONE
Si ces directives ne sont pas suivies, cela peut entraîner des
blessures graves ou une intoxication au monoxyde de carbone
pouvant causer la mort, si des produits de combustion s’infil-
trent dans le bâtiment.
Vérifier que toutes les ouvertures pratiquées dans le mur ex-
térieur autour du ou des tuyaux d’évent (et de la prise d’air)
sont scellées de manière à empêcher l’infiltration de produits
de combustion dans le bâtiment.
Veiller à ce que la ou les sorties de l’évent de l’appareil de
chauffage (et la prise d’air) ne soient, en aucune façon, ob-
struées, quelle que soit la saison.
WARNING
FIRE HAZARD
Failure to follow this warning could result in severe personal
injury and/or property damage.
Inlet pressure tap set screw must be tightened and 1/8-in. NPT
pipe plug must be installed to prevent gas leaks.
GAS VALVE
INLET PRESSURE
TAP SET SCREW
Downloaded from ManualsNet.com search engine

3
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS
See Fig. 1 for 48HC model number nomenclature. See Fig. 2-6
for unit dimensional drawings. Figure 4 shows service clear-
ance dimensions.
Rated Indoor Airflow
Table 1 lists the rated indoor airflow used for the AHRI efficiency
rating for the units covered in this document.
WARNING
FIRE HAZARD
Failure to follow this warning could result in severe personal
injury and/or property damage.
Manifold pressure tap set screw must be tightened and 1/8-in.
NPT pipe plug must be installed to prevent gas leaks.
MANIFOLD
GAS VALVE
MANIFOLD PRESSURE
TAP SET SCREW
Table 1 — Rated Indoor Airflow (CFM)
MODEL NUMBER FULL LOAD AIRFLOW (CFM)
48HC*A/B/F04 1050
48HC*A/B/F05 1400
48HC*A/B/F06 1625
Downloaded from ManualsNet.com search engine

4
Fig. 1 — 48HC 04-06 Model Number Nomenclature (Example)
48HCEA04A2A6A0A3 B 0
Cooling Tons
04 - 3 ton
05 - 4 ton
06 - 5 ton
1
Example:
Position: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Heat Options
D = Low Gas Heat
E = Medium Gas Heat
F = High Gas Heat
L = Low NOx — Low Gas Heat
M = Low NOx — Medium Gas Heat
N = Low NOx — High Gas Heat
S = Low Heat w/ Stainless Steel Exchanger
R = Medium Heat w/ Stainless Steel Exchanger
T = High Heat w/ Stainless Steel Exchanger
(Low NOx models include — Stainless Steel HX)
Sensor Options
A = None
B = RA Smoke Detector
C = SA Smoke Detector
D = RA + SA Smoke Detector
E = CO2
F = RA Smoke Detector and CO2
G = SA Smoke Detector and CO2
H = RA + SA Smoke Detector and CO2
Indoor Fan Options
0 = Electric (Direct) Drive x13 Motor (non Humidi-MiZer®models only)
1 = Standard Static Option - Belt Drive (Humidi-MiZer®models only)
2 = Medium Static Option - Belt Drive
3 = High Static Option - Belt Drive
Coil Options (RTPF) (Outdoor - Indoor - Hail Guard)
A = Al/Cu - Al/Cu
B = Precoat Al/Cu - Al/Cu
C = E-coat Al/Cu - Al/Cu
D = E-coat Al/Cu - E-coat Al/Cu
E = Cu/Cu - Al/Cu
F = Cu/Cu - Cu/Cu
M = Al/Cu -Al/Cu — Louvered Hail Guard
N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard
P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard
Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard
R = Cu/Cu - Al/Cu — Louvered Hail Guard
S = Cu/Cu - Cu/Cu — Louvered Hail Guard
Voltage
1 = 575/3/60
3 = 208-230/1/60
5 = 208-230/3/60
6 = 460/3/60
Design Revision
A = Factory Design Revision
Base Unit Controls
0 = Base Electromechanical Controls
1 = PremierLinkTM Controller
2 = RTU Open Multi-Protocol Controller
D = ComfortLink Controls
Intake / Exhaust Options
A = None
B = Temperature Economizer w/ Barometric Relief
F = Enthalpy Economizer w/ Barometric Relief
K = 2-Position Damper
Service Options
0 = None
1 = Unpowered Convenience Outlet
2 = Powered Convenience Outlet
3 = Hinged Access Panels
4 = Hinged Access Panels and
Unpowered Convenience Outlet
5 = Hinged Panels and
Powered Convenience Outlet
C = Foil Faced Insulation
D = Foil Faced Insulation and
Unpowered Convenience Outlet
E = Foil Faced Insulation and
Powered Convenience Outlet
F = Foil Faced Insulation and
Hinged Access Panels
G = Foil Faced Insulation, Hinged Access Panels
and Unpowered Convenience Outlet
H = Foil Faced Insulation, Hinged Access Panels
and Powered Convenience Outlet
Factory Assigned
0 = Standard
1 = LTL
Electrical Options
A = None
B = HACR Breaker
C = Non-Fused Disconnect
D = Thru-The-Base Connections
E = HACR and Thru-The-Base Connections
F = Non-Fused Disconnect and
Thru-The-Base Connections
Refrig. Systems Options
A = Single stage cooling models
B = Single stage cooling models
with Humidi-MiZer® System
F = Single stage cooling models with
MotorMaster®Low Ambient Controller
Note: On single phase (-3 voltage code) models, the
following are not available as a factory installed option:
- Humidi-MiZer® System
- Coated Coils or Cu Fin Coils
- Louvered Hail Guards
- Economizer or 2 Position Damper
- Powered 115 Volt Convenience Outlet
Unit Heat Type
48 - Gas Heat Packaged Rooftop
Model Series - WeatherMaster®
HC - High Efficiency
Downloaded from ManualsNet.com search engine

5
Fig. 2 — 48HC**04-06 Units Built On and After 4/15/2019
Downloaded from ManualsNet.com search engine

6
Fig. 3 — 48HC**04-06 Units Built Prior to 4/15/2019
Downloaded from ManualsNet.com search engine

7
Fig. 4 — 48HC**04-06 Corner Weights and Clearances
Downloaded from ManualsNet.com search engine

8
Fig. 5 — 48HC**04-06 Base Rail Details
Downloaded from ManualsNet.com search engine

9
Fig. 6 — 48HC**04-06 Thru-the-Base Charts
Downloaded from ManualsNet.com search engine

10
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National Elec-
trical Code) ANSI/NFPA 70 for special installation
requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may inter-
fere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or other)
that provides for the minimum clearances required for safety. This
includes the clearance to combustible surfaces, unit performance
and service access below, around and above unit as specified in
unit drawings. See Fig. 4.
NOTE: Consider also the effect of adjacent units.
Be sure that unit is installed such that snow will not block the
combustion intake or flue outlet.
Unit may be installed directly on wood flooring or on Class A, B,
or C roof-covering material when roof curb is used.
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 (Ameri-
can National Standards Institute) and NFPA (National Fire Protec-
tion Association) 54 TIA-54-84-1. In Canada, installation must be
in accordance with the CAN1-B149 installation codes for gas
burning appliances.
Although unit is weatherproof, avoid locations that permit water
from higher level runoff and overhangs to fall onto the unit.
Locate mechanical draft system flue assembly at least 4 ft (1.2 m)
from any opening through which combustion products could enter
the building, and at least 4 ft (1.2 m) from any adjacent building
(or per local code). Locate the flue assembly at least 10 ft (3.05 m)
from an adjacent unit’s fresh air intake hood if within 3 ft (0.91 m)
of same elevation (or per local code). When unit is located adja-
cent to public walkways, flue assembly must be at least 7 ft
(2.1 m) above grade.
Select a unit mounting system that provides adequate height to
allow installation of condensate trap per requirements. Refer to
Install External Condensate Trap and Line on page 19 for re-
quired trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements. Unit
operating weights are shown in Table 2.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different se-
quences for the steps of unit installation. For example, on curb-
mounted units, some accessories must be installed on the unit be-
fore the unit is placed on the curb. Review the following for rec-
ommended sequences for installation steps.
CURB-MOUNTED INSTALLATION
1. Install curb
2. Install field-fabricated ductwork inside curb
3. Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation instruc-
tions for details)
4. Prepare bottom condensate drain connection to suit planned
condensate line routing (refer to Step 12 on page 19 for
details)
5. Rig and place unit
6. Install outdoor air hood
7. Install flue hood
8. Install gas piping
9. Install condensate line trap and piping
10. Make electrical connections
11. Install other accessories
PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports
2. Check and tighten the bottom condensate drain connection
plug
3. Rig and place unit
4. Convert unit to side duct connection arrangement
5. Install field-fabricated ductwork at unit duct openings
6. Install outdoor air hood
7. Install flue hood
8. Install gas piping
9. Install condensate line trap and piping
10. Make electrical connections
11. Install other accessories
FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the sequence for a
curb installation. Adapt the sequence as required to suit specific
installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with trans-
portation agency.
Confirm before installation of unit that voltage, amperage and cir-
cuit protection requirements listed on unit data plate agree with
power supply provided.
On units with hinged panel option, check to be sure all latches are
snug and in closed position.
Locate the carton containing the outside air hood parts. Do not
remove carton until unit has been rigged and located in final
position.
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in Fig. 4.
Assemble and install accessory roof curb in accordance with in-
structions shipped with the curb.
Table 2 — Operating Weights
48HC-- UNIT lb (kg)
04 05 06
Base Unit 505 (229) 590 (268) 600 (272)
Economizer
Vertical 50 (23) 50 (23) 50 (23)
Horizontal 80 (36) 80 (36) 80 (36)
Humidi-MiZer® System 27 (10) 34 (13) 34 (13)
Cu Fins 25 (11) 43 (20) 56 (25)
Powered Outlet 32 (15) 32 (15) 32 (15)
Curb
14-in. (356 mm) 110 (50) 110 (50) 110 (50)
24-in. (610 mm) 145 (66) 145 (66) 145 (66)
Downloaded from ManualsNet.com search engine

11
Fig. 7 — Roof Curb Details
EE
7/16" [11]
4 9/16"
[115.5]
1/4"
[7.0]
5' 7-3/8"
[1711.3]
1' 4-13/16" [427] INSIDE
1-3/4" [44.4]
2-3/8" [61]
1-3/4" [44.5]
1.00" [25.4]
"A"
1-3/4" [44.4]
21.74"
[552.2]
5.42"
[137.7]
11.96"
[303.8]
4.96"
[126.0] 70.87"
[1800.2]
40.69"
[1033.5]
21.84"
[554.7]
16.03"
[407.2]
1.75"
[44.5] 20.41"
[518.3]
3.00" [76.2]
13.78"
[350.0]
14.00"
[355.6]
3.00" [76.2]
15.19"
[385.8]
32.19"
[817.6]
3'-1 3/16"
[944.6]
"A"
1-3/4" [44.5]
CRBTMPWR001A01 3/4" [19] NPT
3/4" [19] NPT
1/2" [12.7] NPT
CRRFCURB002A01
CONNECTOR PKG. ACC. GAS CONNECTION TYPE GAS FITTING POWER WIRING
FITTING
CONTROL WIRING
FITTING
ACCESSORY CONVENIENCE
OUTLET WIRING CONNECTOR
THRU THE CURB
1/2" [12.7] NPT 1/2" [12.7] NPT
CRBTMPWR003A01 THRU THE BOTTOM
ROOF CURB
ACCESSORY # A
CRRFCURB001A01 14"
[356]
24"
[610]
NOTES: 1. ROOFCURB ACCESSORY IS SHIPPED DISASSEMBLED. 2. INSULATED PANELS: 25.4 [1"] THK. POLYURETHANE FOAM, 44.5 [1-3/4] # DENSITY. 3. DIMENSIONS IN [ ] ARE IN MILLIMETERS. 4. ROOFCURB: 18 GAGE STEEL. 5. ATTACH DUCTWORK TO CURB. (FLANGES OF DUCT REST ON CURB). 6. SERVICE CLEARANCE 4 FEET ON EACH SIDE. 7. DIRECTION OF AIR FLOW. 8. CONNECTOR PACKAGE CRBTMPWR001A01 IS FOR THRU-THE-CURB GAS TYPE PACKAGE CRBTMPWR003A01 IS FOR THRU-THE-BOTTOM TYPE GAS CONNECTIONS.
TYPICAL (4) SIDES
SUPPLY AIR RETURN AIR
ROOFING MATERIAL (FIELD SUPPLIED)
CANT STRIP (FIELD SUPPLIED)
ROOFING FELT (FIELD SUPPLIED)
COUNTER FLASHING (FIELD SUPPLIED)
UNIT
GASKET
(SUPPLIED WITH CURB)
RIGID INSULATION (FIELD SUPPLIED)
DUCT
(FIELD SUPPLIED)
NAIL (FIELD SUPPLIED)
VIEW "B"
CORNER DETAIL
SEE VIEW "B"
RETURN AIR
SUPPLY AIR
SUPPLY AIR OPENING
RETURN AIR OPENING
GAS SERVICE PLATE THRU THE CURB DRILL HOLE
2" [50.8] @ ASSEMBLY (IF REQUIRED) (SEE NOTE #8)
SEE NOTE #2
11 3/4"[298.5] WIDE INSULATED DECK PANELS
8 9/16"[217.5] WIDE INSULATED DECK PANEL
1/3/4"[44.5]
SCALE 0.250
E-ESECTION
48TC400427
Downloaded from ManualsNet.com search engine

12
The gasketing of the unit to the roof curb is critical for a watertight
seal. Install gasket supplied with the roof curb as shown in Fig. 4.
Improperly applied gasket can also result in air leaks and poor unit
performance.
Curb should be level. This is necessary for unit drain to function
properly. Unit leveling tolerances are shown in Fig. 8. Refer to
Accessory Roof Curb Installation Instructions for additional infor-
mation as required.
Install insulation, cant strips, roofing felt, and counter flashing as
shown. Ductwork must be attached to curb and not to the unit. The
accessory thru-the-base power and gas connection package must
be installed before the unit is set on the roof curb. If field-installed
thru-the-roof curb gas connections are desired, use factory-sup-
plied 1/2-in. pipe coupling and gas plate assembly to mount the
thru-the-roof curb connection to the roof curb. Gas connections
and power connections to the unit must be field-installed after the
unit is installed on the roof curb.
If electric and control wiring is to be routed through the basepan,
attach the accessory thru-the-base service connections to the base-
pan in accordance with the accessory installation instructions.
Fig. 8 — Unit Leveling Tolerances
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of 6-in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of
condenser coil air inlet to prevent grass and foliage from obstruct-
ing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit curb sup-
port area. If sleeper rails cannot be used, support the long sides of
the unit with a minimum of 3 equally spaced 4-in. x 4-in. (102 mm
x 102 mm) pads on each side.
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition) shall not
exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg
(112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb and
building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional dimensions
are equal to or greater than the unit supply duct opening dimen-
sions for the first 18-in. (458 mm) of duct length from the unit
basepan.
Insulate and weatherproof all external ductwork, joints, and roof
openings with counter flashing and mastic in accordance with ap-
plicable codes.
Ducts passing through unconditioned spaces 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.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are required.
Rollers may be used to move unit across a roof. Rigging materials
under unit (cardboard or wood) must be removed PRIOR to plac-
ing the unit on the roof curb. Level by using unit frame as a refer-
ence. See Table 2 and Fig. 9 for additional information.
Lifting holes are provided in base rails as shown in Fig. 9. Refer to
rigging instructions on unit.
Rigging materials under unit (cardboard to prevent base pan dam-
age) must be removed PRIOR to placing the unit on the roof curb
When using the standard side drain connection, ensure the red
plug in the alternate bottom connection is tight. Do this before
setting the unit in place. The red drain plug an be tightened with
a 1/2-in. square socket drive extension. For further details, see
“Install External Condensate Trap and Line” on page 19.
Before setting the unit onto the curb, recheck gasketing on curb.
A
B
C
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B B-C A-C
0.5 (13) 1.0 (25) 1.0 (25)
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roofing
materials.
Membrane roofs can be cut by sharp sheet metal edges. Be
careful when placing any sheet metal parts on such roof.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
All panels must be in place when rigging. Unit is not designed
for handling by fork truck when packaging is removed.
If using top crate as spreader bar, once unit is set, carefully
lower wooden crate off building roof top to ground. Ensure
that no people or obstructions are below prior to lowering the
crate.
Downloaded from ManualsNet.com search engine

13
NOTES:
1. SPREADER BARS ARE REQUIRED. Top damage will occur if spreader bars are not used.
2. Dimensions in () are in millimeters.
3. 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 to prevent rigging straps from damaging unit.
Fig. 9 — Rigging Details
POSITIONING ON CURB
Position unit on roof curb so that the following clearances are
maintained: 1/4-in. (6.4 mm) clearance between the roof curb and
the base rail inside the front and rear, 0.0-in. clearance between the
roof curb and the base rail inside on the duct end of the unit. This
will result in the distance between the roof curb and the base rail
inside on the condenser end of the unit being approximately 1/4-in.
(6.4 mm).
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
Flue vent discharge must have a minimum horizontal clearance of
4 ft (1220 mm) from electric and gas meters, gas regulators, and
gas relief equipment. Minimum distance between unit and other
electrically live parts is 48-in. (1220 mm).
Flue gas can deteriorate building materials. Orient unit such that
flue gas will not affect building materials. Locate mechanical draft
system flue assembly at least 48-in. (1220 mm) from an adjacent
building or combustible material.
NOTE: Installation of accessory flue discharge deflector kit will
reduce the minimum clearance to combustible material to 18-in.
(460 mm).
After unit is in position, remove rigging skids and shipping
materials.
Step 7 — Convert to Horizontal and Connect
Ductwork (When Required)
Unit is shipped in the vertical duct configuration. Unit without
factory-installed economizer or return-air smoke detector option
may be field-converted to horizontal ducted configuration. To
convert to horizontal configuration, remove screws from side duct
opening covers (see Fig. 10) and remove covers. Use the screws to
install the covers on vertical duct openings with the insulation-side
down. The panels must be inserted into the notches on the basepan
to properly seal. The notches are covered by the tape used to
secure the insulation to the basepan and are not easily seen. See
Fig. 11 for position of the notches in the basepan. Seals around
duct openings must be tight. Secure with screws as shown in
Fig. 12. Cover seams with foil duct tape.
Field-supplied flanges should be attached to horizontal duct open-
ings and all ductwork should be secured to the flanges. Insulate
and weatherproof all external ductwork, joints, and roof or build-
ing openings with counter flashing and mastic in accordance with
applicable codes.
Do not cover or obscure visibility to the unit’s informative data
plate when insulating horizontal ductwork.
DETAIL "A"
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
DUCT END
SEE DETAIL "A"
"A"
(914-1371)
36"- 54"
"C"
"B"
SPREADER
BARS
REQUIRED
UNIT MAX WEIGHT DIMENSIONS
ABC
lb kg in. mm in. mm in. mm
48HC-A04 760 345 74.5 1890 38.0 965 33.5 850
48HC-A05 895 407 74.5 1890 38.0 965 41.5 1055
48HC-A06 930 423 74.5 1890 37.5 955 41.5 1055
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
All panels must be in place when rigging. Unit is not designed
for handling by fork truck when packaging is removed.
If using top crate as spreader bar, once unit is set, carefully
lower wooden crate off building roof top to ground. Ensure
that no people or obstructions are below prior to lowering the
crate.
Downloaded from ManualsNet.com search engine

14
Fig. 10 — Horizontal Conversion Panels
Fig. 11 — Location of Notches
Fig. 12 — Horizontal Duct Panels In Place
Step 8 — Install Outside Air Hood
ECONOMIZER AND TWO POSITION DAMPER HOOD
PACKAGE REMOVAL AND SETUP (FACTORY OPTION)
NOTE: Economizer and two position damper are not available
as factory-installed options for single phase (-3 voltage code)
models.
1. The hood is shipped in knock-down form and must be field
assembled. The indoor coil access panel is used as the hood
top while the hood sides, divider and filter are packaged
together, attached to a metal support tray using plastic stretch
wrap, and shipped in the return air compartment behind the
indoor coil access panel. The hood assembly’s metal tray is
attached to the basepan and also attached to the damper using
two plastic tie-wraps.
2. To gain access to the hood, remove the filter access panel. See
Fig. 13.
3. Locate the (2) screws holding the metal tray to the basepan
and remove. Locate and cut the (2) plastic tie-wraps securing
the assembly to the damper. See Fig. 14. Be careful to not
damage any wiring or cut tie-wraps securing any wiring.
4. Carefully lift the hood assembly (with metal tray) through the
filter access opening and assemble per the steps outlined in
the Economizer Hood and Two-Position Hood section.
Fig. 13 — Typical Access Panel Locations
Fig. 14 — Economizer and Two-Position Damper
Hood Parts Location
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER
BASEPAN
NOTCHES NOTCHES
SCREWS
DUCT COVERS
SHEET METAL
FACE UP
BASEPAN
FILTER ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL
COMPRESSOR
ACCESS PANEL
HOOD PARTS
PLASTIC TIE WRAP
QTY (2)
SCREWS FOR
METAL TRAY
QTY (2)
Downloaded from ManualsNet.com search engine

15
ECONOMIZER AND TWO-POSITION HOOD
NOTE: If the power exhaust accessory is to be installed on the
unit, the hood shipped with the unit will not be used and must be
discarded. Save the aluminum filter for use in the power exhaust
hood assembly.
1. The indoor coil access panel will be used as the top of the
hood. Remove the screws along the sides and bottom of the
indoor coil access panel. See Fig. 15.
2. Swing out indoor coil access panel and insert the hood sides
under the panel (hood top). Use the screws provided to attach
the hood sides to the hood top. Use screws provided to attach
the hood sides to the unit. See Fig. 16.
3. Remove the shipping tape holding the economizer barometric
relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See Fig. 16
and 17. Secure hood divider with 2 screws on each hood side.
The hood divider is also used as the bottom filter rack for the
aluminum filter.
5. Open the filter clips which are located underneath the hood
top. Insert the aluminum filter into the bottom filter rack
(hood divider). Push the filter into position past the open filter
clips. Close the filter clips to lock the filter into place. See
Fig. 17.
6. Caulk the ends of the joint between the unit top panel and the
hood top.
7. Replace the filter access panel.
Fig. 15 — Indoor Coil Access Panel Relocation
Fig. 16 — Economizer Hood Construction
Fig. 17 — Economizer Filter Installation
Step 9 — Units with Hinged Panels Only
Relocate latch shipped inside the compressor compartment behind
the hinged compressor door to location shown in Fig. 18 after unit
installation.
If the unit does not have hinged panels, skip this step and continue
at Step 10 below.
Fig. 18 — Compressor Door Latch Location
Step 10 — Install Flue Hood
Flue hood is shipped screwed to the basepan beside the burner
compartment access panel. Remove from shipping location and
using screws provided, install flue hood and screen in location
shown in Fig. 19.
Fig. 19 — Flue Hood Details
TOP
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
PANEL
B
TOP
PANEL
INDOOR COIL
ACCESS PANEL
19 1/16”
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
33 3/8”
(848mm)
(483mm)
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
BLOWER
ACCESS
PANEL
FLUE OPENING
BLOWER
ACCESS
PANEL
FLUE OPENING
Downloaded from ManualsNet.com search engine

16
Step 11 — Install Gas Piping
Installation of the gas piping must be accordance with local
building codes and with applicable national codes. In U.S.A., re-
fer to NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC).
In Canada, installation must be accordance with the CAN/CSA
B149.1 and CAN/CSA B149.2 installation codes for gas burning
appliances.
This unit is factory equipped for use with natural gas (NG) fuel at
elevations up to 2000 ft (610 m) above sea level. Unit may be field
converted for operation at elevations above 2000 ft (610 m) and/or
for use with liquefied petroleum fuel. See accessory kit installation
instructions regarding these accessories.
NOTE: Furnace gas input rate on rating plate is for installation up
to 2000 ft (610 m) above sea level. In U.S.A., the input rating for
altitudes above 2000 ft (610 m) must be derated by 4% for each
1000 ft (305 m) above sea level. In Canada, the input rating must
be derated by 10% for altitudes of 2000 ft (610 m) to 4500 ft
(1372 m) above sea level.
For natural gas applications, gas pressure at unit gas connection
must not be less than 4 in. wg (996 Pa) or greater than 13 in. wg
(3240 Pa) while the unit is operating. On 48HCF/N/T*05-06
(high-heat) units, the gas pressure at unit gas connection must
not be less than 5 in. wg (1245 Pa) or greater than 13 in. wg
(3240 Pa) while the unit is operating. See Table 3. For liquefied
petroleum applications, the gas pressure must not be less than
11 in. wg (2740 Pa) or greater than 13.6 in. wg (3390 Pa) at the
unit connection. See Table 4.
The gas supply pipe enters the unit at the burner access panel on
the front side of the unit, through the long slot at the bottom of the
access panel. The gas connection to the unit is made to the 1/2-in.
FPT gas inlet port on the unit gas valve.
Manifold pressure is factory-adjusted for natural gas fuel use.
Adjust as required to obtain best flame characteristics. See
Tables 5 and 6.
Install a gas supply line that runs to the unit heating section. Refer
to the NFPA 54/NFGC or equivalent code for gas pipe sizing data.
Do not use a pipe size smaller than 1/2-in. Size the gas supply line
to allow for a maximum pressure drop of 0.5 in. wg (124 Pa) be-
tween gas regulator source and unit gas valve connection when
unit is operating at high-fire flow rate.
The gas supply line can approach the unit in three ways: horizon-
tally from outside the unit (across the roof), through-curb/under
unit basepan (accessory kit required), or through unit basepan
(factory option or accessory kit required). Consult accessory kit
installation instructions for details on these installation methods.
Observe clearance to gas line components per Fig. 20.
Fig. 20 — Gas Piping Guide
(with Accessory Thru-the-Curb Service Connections)
FACTORY OPTION THRU-BASE CONNECTIONS (GAS
CONNECTIONS)
This service connection kit consists of a 1/2-in. electrical bulkhead
connector and a 3/4-in. electrical bulkhead connector, connected to
an “L” bracket covering the embossed (raised) section of the unit
basepan in the condenser section (see Fig. 21 for shipping posi-
tion). The 3/4-in. bulkhead connector enables the low-voltage con-
trol wires to pass through the basepan. The 1/2-in. bulkhead con-
nector allows the high-voltage power wires to pass through the
basepan. See Fig. 22 and 23.
Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE MIN. MAX.
48HCD/E/L/M/S/R 04, 05, 06 4.0 in. wg
(996 Pa)
13.0 in. wg
(3240 Pa)
48HCF/N/T
(High Heat Units Only) 05, 06 5.0 in. wg
(1245 Pa)
13.0 in. wg
(3240 Pa)
Table 4 — Liquid Propane Supply Line Pressure
Ranges
UNIT MODEL UNIT SIZE MIN. MAX.
48HCD/E/L/M/S/R 04, 05, 06 11.0 in. wg
(2737 Pa)
13.0 in. wg
(3240 Pa)
Table 5 — Natural Gas Manifold Pressure Ranges
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
48HCD/E/L/M/S/R 04, 05, 06 3.5 in. wg
(872 Pa)
1.7 in. wg
(423 Pa)
48HCF/N/T
(High Heat Units Only) 05, 06 3.5 in. wg (872 Pa)
1.7 in. wg
(423 Pa)
Table 6 — Liquid Propane Manifold Pressure Ranges
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
48HCD/E/L/M/S/R 04, 05, 06 10.0 in. wg
(2488 Pa)
5.0 in. wg
(1244 Pa)
CAUTION
EQUIPMENT DAMAGE
Failure to follow this caution may result in equipment damage.
When connecting the gas line to the unit gas valve, the installer
MUST use a backup wrench to prevent damage to the valve.
X
BASE UNIT
BASE RAIL
ROOF
CURB
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
*
GAS
REGULATOR
*
48” MINIMUM
DRIP LEG
PER NFGC
*
FIELD-FABRICATED
SUPPORT
*
FROM
GAS
METER
LEGEND *Field supplied.
NOTE: Follow all local codes.
NFGC — National Fuel Gas
Code
STEEL PIPE NOMINAL
DIAMETERS (in.)
SPACING OF SUPPORTS
X DIMENSION (ft)
1/26
3/4or 1 8
1-1/4or larger 10
Downloaded from ManualsNet.com search engine

17
Fig. 21 — Thru-the-Base Fitting Assembly (Shown in
Shipping Position)
Fig. 22 — Thru-Base Connection Fittings (Units Built
Prior to 4/15/2019)
Fig. 23 — Thru-Base Connection Fittings (Units Built
On and After 4/15/2019)
1. Remove the “L” bracket assembly from the unit.
2. Remove connector plate assembly from the “L” bracket
and discard the “L” bracket, but retain the washer head
screws and the gasket (located between the “L” bracket
and the connector plate assembly).
NOTE: Take care not to damage the gasket, as it is reused in the
following step.
3. Place the gasket over the embossed area in the basepan,
aligning the holes in the gasket to the holes in the basepan.
See Fig. 21.
4. Install the connector plate assembly to the basepan using 8
of the washer head screws.
The thru-base gas connector has male and female threads. The
male threads protrude above the basepan of the unit; the female
threads protrude below the basepan.
Check tightness of connector lock nuts before connecting gas
piping.
Install a 1/2-in. NPT street elbow on the thru-base gas fitting. At-
tach a 1/2-in. pipe nipple with minimum length of 16-in. (406 mm)
(field-supplied) to the street elbow and extend it through the ac-
cess panel at the gas support bracket. See Fig. 24.
Fig. 24 — Gas Line Piping for 3 to 5 Ton Units Only
Other hardware required to complete the installation of the gas
supply line includes a manual shutoff valve, a sediment trap (drip
leg) and a ground-joint union. A pressure regulator valve may also
be required (to convert gas pressure from pounds to inches of pres-
sure). The manual shutoff valve must be located within 6 ft
(1.83 m) of the unit. The union, located in the final leg entering the
unit, must be located at least 9-in. (230 mm) away from the access
panel to permit the panel to be removed for service. If a regulator
valve is installed, it must be located a minimum of 4 ft (1220 mm)
away from the unit’s flue outlet. Some municipal codes require
that the manual shutoff valve be located upstream of the sediment
trap. See Fig. 25 and 26 for typical piping arrangements for gas
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR 3TO 6 TON UNITS.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR
3 TO 6 TON UNITS
A
UXILIARY
POWER
SUPPLY
(OPTIONAL)
EMBOSSMENT BRASS FITTING
FOR 3-6 TON UNITS
SUPPORT
BRACKET
Downloaded from ManualsNet.com search engine

18
piping that has been routed through the sidewall of the curb. See
Fig. 27 for typical piping arrangement when thru-base is used. En-
sure that all piping does not block access to the unit’s main control
box or limit the required working space in front of the control box.
Fig. 25 — Gas Piping, Typical Curb Sidewall Piping
(Example 1)
Fig. 26 — Gas Piping, Typical Curb Sidewall Piping
(Example 2)
Fig. 27 — Gas Piping, Typical Thru-Base
Connections
When installing the gas supply line, observe local codes pertaining
to gas pipe installations. Refer to the NFPA 54/ANSI Z223.1
NFGC latest edition (in Canada, CAN/CSA B149.1). In the ab-
sence of local building codes, adhere to the following pertinent
recommendations:
• Avoid low spots in long runs of pipe. Grade all pipe 1/4-in.
per every 15 ft (7 mm per every 5 m) to prevent traps.
Grade all horizontal runs downward to risers. Use risers to
connect to heating section and to meter.
• Protect all segments of piping system against physical and
thermal damage. Support all piping with appropriate
straps, hangers, etc. Use a minimum of one hanger every
6 ft (1.8 m). For pipe sizes larger than 1/2-in., follow rec-
ommendations of national codes.
• Apply joint compound (pipe dope) sparingly and only to
male threads of joint when making pipe connections. Use
only pipe dope that is resistant to action of liquefied petro-
leum gases as specified by local and/or national codes. If
using PTFE (Teflon1) tape, ensure the material is Double
Density type and is labeled for use on gas lines. Apply tape
per manufacturer’s instructions.
• Pressure-test all gas piping in accordance with local and
national plumbing and gas codes before connecting piping
to unit.
NOTE: Pressure test the gas supply system after the gas supply
piping is connected to the gas valve. The supply piping must be
disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig (3450 Pa). Pres-
sure test the gas supply piping system at pressures equal to or less
than 0.5 psig (3450 Pa). The unit heating section must be isolated
from the gas piping system by closing the external main manual
shutoff valve and slightly opening the ground-joint union.
Check for gas leaks at the field-installed and factory-installed
gas lines after all piping connections have been completed. Use
soap-and-water solution (or method specified by local codes
and/or regulations).
NOTE: If orifice hole appears damaged or it is suspected to have
been redrilled, check orifice hole with a numbered drill bit of cor-
rect size. Never redrill an orifice. A burr-free and squarely aligned
orifice hole is essential for proper flame characteristics. See
Fig. 28.
9” (229mm) MIN
UNION
SHUT OFF
VALVE
DRIP
LEG
THRU-CURB ADAPTER
UNIT BASE RAIL
SHUT OFF
VALVE
UNION
9” (229 mm) MIN
UNIT BASE RAIL
BURNER
ACCESS
PANEL
THRU-CURB ADAPTER
DRIP
LEG
1.Teflon is a registered trademark of DuPont.
WARNING
Failure to follow this warning could result in personal injury,
death and/or property damage.
• Connect gas pipe to unit using a backup wrench to
avoid damaging gas controls.
• Never purge a gas line into a combustion chamber.
• Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections.
• Use proper length of pipe to avoid stress on gas control
manifold.
Downloaded from ManualsNet.com search engine

19
Fig. 28 — Orifice Hole
Step 12 — Install External Condensate Trap and
Line
The unit has one 3/4-in. condensate drain connection on the end of
the condensate pan and an alternate connection on the bottom. See
Fig. 29. Unit airflow configuration does not determine which
drain connection to use. Either drain connection can be used with
vertical or horizontal applications.
When using the standard side drain connection, ensure the red
plug in the alternate bottom connection is tight. Do this before
setting the unit in place. The red drain pan can be tightened with
a 1/2-in. square socket drive extension.
To use the alternate bottom drain connection, remove the red drain
plug from the bottom connection (use a 1/2-in. square socket drive
extension) and install it in the side drain connection.
The piping for the condensate drain and external trap can be com-
pleted after the unit is in place. See Fig. 30.
All units must have an external trap for condensate drainage. In-
stall a trap at least 4-in. (102 mm) deep and protect against
freeze-up. If drain line is installed downstream from the external
trap, pitch the line away from the unit at 1-in. per 10 ft (25 mm
per 3 m) of run. Do not use a pipe size smaller than the unit con-
nection (3/4-in.).
Fig. 29 — Condensate Drain Pan (Side View)
Fig. 30 — Condensate Drain Pan Piping Details
Step 13 — Make Electrical Connections
NOTE: Field-supplied wiring shall conform with the limitations
of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional powered convenience outlet, the power
source leads to the convenience outlet’s transformer primary are
not factory connected. Installer must connect these leads accord-
ing to required operation of the convenience outlet. If an always-
energized convenience outlet operation is desired, connect the
source leads to the line side of the unit-mounted disconnect.
(Check with local codes to ensure this method is acceptable in
your area.) If a de-energize via unit disconnect switch operation of
the convenience outlet is desired, connect the source leads to the
load side of the unit disconnect. On a unit without a unit-mounted
disconnect, connect the source leads to compressor contactor C
and indoor fan contactor IFC pressure lugs with unit field power
leads. See Convenience Outlets on page 21 for power transformer
connections.
The field power wires are connected to the unit at line-side pres-
sure lugs on compressor contactor C and indoor fan contactor IFC
(see wiring diagram label for control box component arrange-
ment) or at factory-installed option non-fused disconnect switch or
HACR. Maximum wire size is #2ga AWG (copper only) per pole
on contactors and #2ga AWG (copper only) per pole on optional
disconnect or HACR. See Fig. 31 and unit label diagram for field
power wiring connections.
NOTE: Unit may be equipped with short test leads (pigtails) on
the field line connection points on contactor C or optional discon-
nect switch. These leads are for factory-run test purposes only; re-
move and discard before connecting field power wires to unit con-
nection points. Make field power connections directly to line con-
nection pressure lugs only.
BURNER
ORIFICE
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
WARNING
Failure to follow this warning could result in personal injury or
death.
Do not use gas piping as an electrical ground.
Unit cabinet must have an uninterrupted, unbroken electrical
ground to minimize the possibility of personal injury if an
electrical fault should occur. This ground may consist of elec-
trical wire connected to unit ground lug in control compart-
ment, or conduit approved for electrical ground when installed
in accordance with NEC (National Electrical Code); ANSI/
NFPA 70, latest edition (in Canada, Canadian Electrical Code
CSA [Canadian Standards Association] C22.1), and local elec-
trical codes.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. (102 mm) trap isrecommended.
MINIMUM PITCH
1˝ (25 mm) PER
10´ (3m) OF LINE
BASE RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
SEE NOTE
3˝ (76 mm)
MIN
Downloaded from ManualsNet.com search engine

20
Fig. 31 — Power Wiring Connections
Fig. 32 — Disconnect Switch and Unit
UNITS WITH FACTORY-INSTALLED NON-FUSED DIS-
CONNECT OR HACR
The factory-installed option non-fused disconnect (NFD) or
HACR switch is located in a weatherproof enclosure located un-
der the main control box. The manual switch handle and shaft are
shipped in the disconnect or HACR enclosure. Assemble the shaft
and handle to the switch at this point. Discard the factory test leads
(see Fig. 31).
Connect field power supply conductors to LINE side terminals
when the switch enclosure cover is removed to attach the handle.
Field-Install the NFD Shaft and Handle
1. Remove unit front panel (see Fig. 2 and 3).
2. Remove (3) hex screws on the NFD enclosure — (2) on
the face of the cover and (1) on the left side cover. See
Fig. 33.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at OFF
position (the arrow on the black handle knob is at OFF).
5. Insert the shaft with the cross pin on the top of the shaft in
the horizontal position. See Fig. 34.
6. Measure from the tip of the shaft to the top surface of the
black pointer; the measurement should be 3.75 to 3.88 in.
(95 to 99 mm).
7. Tighten the locking screw to secure the shaft to the NFD.
8. Turn the handle to the OFF position with red arrow point-
ing at OFF.
9. Install the handle on to the painted cover horizontally with
the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) screws and
lock washers supplied.
11. Engaging the shaft into the handle socket, re-install (3)
hex screws on the NFD enclosure.
12. Re-install the unit front panel.
Fig. 33 — NFD Enclosure Location
Fig. 34 — NFD Handle and Shaft Assembly
Field-Install the HACR Shaft and Handle
1. Remove unit front panel (see Fig. 2 and 3).
2. Remove (3) hex screws on the HACR enclosure - (2) on
the face of the cover and (1) on the left side cover. See
Fig. 35.
3. Remove the front cover of the HACR enclosure.
4. Make sure the HACR shipped from the factory is at OFF
position (the white arrow pointing at OFF).
5. Insert the shaft all the way with the cross pin on the top of
the shaft in the horizontal position. See Fig. 36.
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch and
unit. Use only copper wire.
C
11 23
Disconnect
per
NEC
208/230-1-60
or
Disconnect
per
NEC
11 13 13 23
L1 L2 L3
TB
CIFC
Direct Drive IFM
208/230-3-60
460-3-60
575-3-60
Units Without Disconnect or HACR Option
Units With Disconnect or HACR Option
L1
L2
L3
2
4
6
1
5
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
1-ph Belt Drive IFM
3
Equip
GR Lug
Ground
(GR)
Ground
(GR)
Equip
GR Lug
Equip GR Lug
Ground
(GR)
3 Phase Only 3 Phase Only
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
Downloaded from ManualsNet.com search engine