Carrier 48LC 07 User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480218-01 Printed in U.S.A. Form 48LC-7-06SI Pg 1 6-19 Replaces: 48LC-7-05SI
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . 6
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . . . 7
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 4 — Provide Unit Support. . . . . . . . . . . . . . . . . . 7
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . 9
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . 9
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and Connect
Ductwork (when required). . . . . . . . . . . . . . . . . . . 10
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 11
• ECONOMIZER HOOD PACKAGE REMOVAL AND
SETUP - FACTORY OPTION
• ECONOMIZER HOOD
Step 9 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . 12
Step 10 — Install Gas Piping. . . . . . . . . . . . . . . . . . . 12
• FACTORY-OPTION THRU-BASE CONNECTIONS
(GAS CONNECTIONS)
Step 11 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Step 12 — Make Electrical Connections . . . . . . . . . 15
• 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
• FACTORY-OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• UNITS WITHOUT THRU-BASE CONNECTIONS
• FIELD CONTROL WIRING
• THERMOSTAT
• UNIT WITHOUT THRU-BASE CONNECTION KIT
• HEAT ANTICIPATOR SETTINGS
Humidi-MiZer® System Control Connections . . . . . 28
• HUMIDI-MIZER SYSTEM – SPACE RH CONTROLLER
RTU Open Controller (Factory-Installed Option). . . 28
SystemVu Controller (Factory-Installed Option). . . 28
Integrated Staging Control (ISC) Board . . . . . . . . . . 29
• ISC BOARD - SEQUENCE OF OPERATION
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . . 31
• SYSTEM COMPONENTS
• SPECIFICATIONS
•INPUTS
•OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• INTERFACE OVERVIEW
• SETUP AND CONFIGURATION
• ENTHALPY SETTINGS
• TWO-SPEED FAN OPERATION
• CHECKOUT
• TROUBLESHOOTING
Staged Air Volume (SAV™) with Variable Frequency
Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Multi-Speed VFD Display Kit (Field-Installed
Accessory) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
• ALPHA NUMERIC DISPLAY
• MENU KEY
• NAVIGATION KEYS AND STATUS LEDS
• OPERATION KEYS AND LEDS
• CONNECTING THE KEYPAD TO THE VFD
• PROGRAM THE VFD FOR 3 DISCRETE INDOOR FAN
SPEEDS
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
• COMPLETING INSTALLATION OF RETURN AIR
SMOKE SENSOR
• ADDITIONAL APPLICATION DATA
Step 13 — Adjust Factory-Installed Options . . . . . .54
• SMOKE DETECTORS
Step 14 — Install Accessories . . . . . . . . . . . . . . . . . .54
Step 15 — Check Belt Tension . . . . . . . . . . . . . . . . .54
• 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 literature, tags and labels attached to the
unit, and other safety precautions that may apply.
Follow all safety codes, including ANSI (American National
Standards 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 instructions 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-
WeatherExpert® 48LC 07
Single Package Rooftop Unit
Gas Heat/Electric Cooling
with Puron®(R-410A) Refrigerant

2
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.
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
pressure greater than 0.5 psig (3450 Pa). Pressures greater
than 0.5 psig will cause gas valve damage resulting in haz-
ardous condition. If gas valve is subjected to pressure great-
er than 0.5 psig, it must be replaced before use. When pres-
sure 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).
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, 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.
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, 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.
GAS VALVE
INLET PRESSURE
TAP SET SCREW
MANIFOLD
GAS VALVE
MANIFOLD PRESSURE
TAP SET SCREW
WARNING
CARBON-MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe personal
injury or death due to carbon-monoxide poisoning, if
combustion 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
obstructed 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 car-
bone pouvant causer la mort, si des produits de combustion
s’infiltrent dans le bâtiment.
Vérifier que toutes les ouvertures pratiquées dans le mur
extérieur 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
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lock(s)
and lockout tag(s). Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit rating
plate. Unit may have more than one power switch.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron®(R-410A) refrigerant systems operate at higher pres-
sures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron 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
repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refriger-
ants and oils.

3
Rated Indoor Airflow (cfm)
Table 1 lists the rated indoor airflow used for the AHRI effi-
ciency rating for the units covered in this document. See Fig. 1
for unit options, Fig. 2 for unit dimensions, and Fig. 3 for ser-
vice clearances.
Fig. 1 — Model Number Nomenclature
CAUTION
CUT 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.
Table 1 — Rated Indoor Airflow (cfm)
MODEL NUMBER FULL LOAD AIRFLOW (CFM)
48LC**07 2250
48LCD007A1A5-0A0 A 0
123456789
10 11 12 13 14 15 16
17 18
Model Series - WeatherExpert®
LC - Ultra High Efficiency
Unit Heat Type
48 - Gas Heat Packaged Rooftop
Cooling Tons
07 - 6 ton
Heat Options
D = Low Gas Heat
E = Medium Gas Heat
F = High Gas Heat
S = Low Heat w/ Stainless Steel Exchanger
R = Medium Heat w/ Stainless Steel Exchanger
T = High Heat w/ Stainless Steel Exchanger
Sensor Options
A = None
B = RA Smoke Detector
C = SA Smoke Detector
D = RA + SA Smoke Detector
E = CO
2
F = RA Smoke Detector and CO2
G = SA Smoke Detector and CO2
H = RA + SA Smoke Detector and CO2
Indoor Fan Options
1 = Standard Static Belt Drive with VFD controller
2 = Medium Static Belt Drive with VFD controller
3 = High Static Belt Drive with VFD controller
Refrig. Systems Options
0 = Three stage cooling capacity control with TXV
A = Three stage cooling capacity control with TXV
and Humidi-MiZer® System
Coil Options: Fin/Tube (Condenser- Evaporator - 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
5 = 208-230/3/60
6 = 460/3/60
Design Revision
- = Factory Design Revision
Base Unit Controls
0 = Electro-mechanical Controls
1 = RTU Open Multi-Protocol Controller
4 = SystemVu™ Controller
Intake / Exhaust Options
A = None
B = Low Leak Temperature Economizer
with Barometric Relief
E = Low Leak Enthalpy Economizer
with Barometric Relief
N = Ultra Low Leak Temperature Economizer
with Barometric Relief
R = Ultra Low Leak Enthalpy Economizer
with Barometric Relief
Service Options
0 = None
1 = Unpowered Convenience Outlet
2 = Powered Convenience Outlet
3 = Hinged Panels
4 = Hinged Panels and
Unpowered Convenience Outlet
5 = Hinged Panels and
Powered Convenience Outlet
Packaging
0 = Standard
1 = LTL
Electrical Options
A = None
B = HACR Circuit Breaker
C = Non-Fused Disconnect
D = Thru-The-Base Connections
E = HACR Circuit Breaker
and Thru-The Base Connections
F = Non-Fused Disconnect and
Thru-The-Base Connections
Example:
Position:

4
Fig. 2 — Unit Dimensional Drawing

5
Fig. 2 — Unit Dimensional Drawing (cont)

6
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead obstruc-
tion or for vertical clearances.
Fig. 3 — Service Clearance Dimensional Drawing
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
interfere 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 and around unit as
specified in Fig. 3.
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 Com-
bustion and Ventilation) of the National Fuel Gas Code, ANSI
Z223.1 (American National Standards Institute) and NFPA
(National Fire Protection 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 wa-
ter 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 adja-
cent 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 adjacent to public walkways, flue
assembly must be at least 7 ft (2.1 m) above grade.
C
BA
D
LOCATION DIMENSION CONDITION
A
48-in. (1219 mm) Unit disconnect is mounted on panel
18-in. (457 mm) No disconnect, convenience outlet option
18-in. (457 mm) Recommended service clearance
12-in. (305 mm) Minimum clearance
B
42-in. (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall)
36-in. (914 mm) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Special Check sources of flue products within 10 ft of unit fresh air intake hood
C36-in. (914 mm) Side condensate drain is used
18-in. (457 mm) Minimum clearance
D42-in. (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
36-in. (914 mm) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)

7
Select a unit mounting system that provides adequate height to
allow installation of condensate trap per requirements. Refer to
“Step 11 — Install External Condensate Trap and Line” on
page 15 for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements.
Unit operating weight is 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
before the unit is placed on the curb. Review the following for
recommended 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
instructions for details)
4. Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to “Step 11 —
Install External Condensate Trap and Line” on page 15 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 as required to suit specific installa-
tion plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with
transportation agency.
Confirm before installation of unit that voltage, amperage and
circuit protection requirements listed on unit data plate agree
with power supply provided.
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in
Fig. 5. Assemble and install accessory roof curb in accordance
with instructions shipped with the curb.
NOTE: 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. 5. Improperly applied gasket can also result in
air leaks and poor unit performance.
Curb should be level. This is necessary for unit drain to func-
tion properly. Unit leveling tolerances are shown in Fig. 4. Re-
fer to Accessory Roof Curb Installation Instructions for addi-
tional information as required.
Fig. 4 — Unit Leveling Tolerances
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-supplied 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.
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 ob-
structing 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
support 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.
Table 2 — Operating Weights
48LC**07 UNITS LB (KG)
Base Unit 1032 (468)
Economizer
Vertical 75 (34)
Horizontal 122 (55)
Powered Outlet 35 (16)
Curb
14-in. (356 mm) 143 (65)
24-in. (610 mm) 245 (111)
A-B
0.5 (13)
B-C
1.0 (25)
A-C
1.0 (25)
MAXIMUM ALLOWABLE
DIFFERENCE – IN. (MM)

8
Fig. 5 — Roof Curb Details
7/16" [11]
4 9/16"
[115.5]
1/4"
[7.0]
"A"
1 3/4" [44.5]
1 3/4" [44.4]
20-3/4" [513] INSIDE
"A"
81 3/4"
[2076.3]
53 1/2"
[1358.9]
1 3/4" [44.5]
40 3/16" [1020.8]
2 1/4" [57.2]
26"
[660.4]
4 3/16" [106.0]
6 3/64" [153.5]
32 9/16"
[827.1]
23 1/16"
[585.8]
31 17/32"
[800.9]
1 3/4" [44.5]
15 13/16"
[401.6]
11.42" [290.0]
1 3/4"
[44.4]
3"
[76.2]
2-3/8" [61]
14 3/4" [374.7]
6' 6-1/4"
[1987.5]
1-3/4" TYP [44.5]
4' 2"
[1270.0]
15 15/32 [392.9]
1.00" [25.4]
CRBTMPWR002A01
3/4" [19] NPT 1 1/4" [31.7] NPT
CRRFCURB004A01
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
CRBTMPWR004A01 THRU THE BOTTOM
ROOF CURB
ACCESSORY # A
CRRFCURB003A01 14"
[356]
24"
[610]
ECN NO.APP'DCHK'DBYDATEREVISION RECORDREV
1067898--MMC4/22/13
6' 61/4" WAS 6' 7 1/6", 4'2' WAS 4' 2 13/16"; 18 GA WAS 16 GA.; 15 13/16" WAS 15 15/16"; NAIL FIELD SUPPLIED WAS WITH CURB
C
DRAWING RELEASE LEVEL: PRODUCTION THIRD ANGLE PROJECTION
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCES ON: THIS DOCUMENT AND THE INFORMATION CONTAINED THEREIN
IS PROPRIETARY TO CARRIER CORPORATION AND SHALL NOT BE USED OR DISCLOSED TO OTHERS, IN WHOLE OR IN PART, WITHOUT THE WRITTEN AUTHORIZATION OF CARRIER CORPORATION.
1 DEC 2 DEC 3 DEC ANG
MATERIAL ----
- - -
AUTHORIZATION NUMBER TITLE
1029120 CURB ASY, ROOF
ENGINEERING MANUFACTURING
ENGINEERING REQUIREMENTS ----SIZE DRAWING NUMBER REV
T-005, Y-002 DRAFTER CHECKER
D
50HJ405012 C
WEIGHT: -MMC 12/16/09 - - SHEET 5 OF 5
SURFACE FINISH MFG/PURCH MODEL (INTERNAL USE ONLY) NEXT DRAWING SCALE DISTRIBUTION
- PURCH - N/A -
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 CRBTMPWR002A01 IS FOR THRU-THE-CURB GAS TYPE PACKAGE CRBTMPWR004A01 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)
CERTIFIED DRAWING
VIEW "B"
CORNER DETAIL
SECTION THRU SIDE
SEE VIEW "B"
GAS SERVICE PLATE THRU THE CURB DRILL HOLE
2" [50.8] @ ASSEMBLY (IF REQUIRED) (SEE NOTE #8)
SEE NOTE #2
12-1/2" [317.5] WIDE
INSULATED DECK PANELS
9-15/16" [252.4] WIDE
INSULATED DECK PANEL
SUPPLY AIR
RETURN AIR
SUPPLY AIR
OPENING
RETURN AIR
OPENING

9
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 dimen-
sions are equal to or greater than the unit supply duct opening
dimensions 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 applicable 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. Level by using
unit frame as a reference. See Table 2 and Fig. 6 for additional
information.
Lifting holes are provided in base rails as shown in Fig. 6. Re-
fer to rigging instructions on unit.
Rigging materials under unit (cardboard or wood) must be re-
moved 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 plug can be tightened with a
1/2-in. square socket drive extension. For further details see
“Step 11 — Install External Condensate Trap and Line” on
page 15.
Before setting the unit onto the curb, recheck gasketing on
curb.
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 back, 0.0-in. clearance be-
tween 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 35/16 in. (84 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 the unit is in position remove all riggings, shipping mate-
rials and top skid. Recycle or dispose of all shipping materials.
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roof-
ing 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.

10
Fig. 6 — Rigging Label
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 op-
tion may be field-converted to horizontal ducted configuration.
To convert to horizontal configuration, remove screws from
side duct opening covers (see Fig. 7) 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 cov-
ered by the tape used to secure the insulation to the basepan
and are not easily seen. See Fig. 8 for position of the notches in
the basepan. Seals around duct openings must be tight. Secure
with screws as shown in Fig. 9. Cover seams with foil duct
tape.
Field-supplied flanges should be attached to horizontal duct
openings and all ductwork should be secured to the flanges. In-
sulate and weatherproof all external ductwork, joints, and roof
or building openings with counter flashing and mastic in accor-
dance with applicable codes.
Do not cover or obscure visibility to the unit’s informative data
plate when insulating horizontal ductwork.
Fig. 7 — Horizontal Conversion Panels
ALL PANELS MUST BE IN PLACE WHEN RIGGING.
TOUS LES CAPOTS DOIVENT ÊTRE EN PLACE AVANT LE LEVAGE
CAUTION - NOTICE TO RIGGERS:
AVERTISSEMENT - REMARQUE À
L’ATTENTION DES MONTEURS
• Hook rigging shackles through holes in base rail, as shown in Detail “A”.
• Use wooden top skid, when rigging, to prevent rigging straps from damaging unit.
• Max weight includes base unit plus shipping pallet plus all available FIOP's which
could be on that size unit.
• "B" dimension is based on base unit plus economizer option only. This
dimension may vary slightly with units configured with other FIOP options.
• Spreader bars required to lift and transport the unit.
• Accrocher les manilles des élingues de levages dans les trous situés dans le rail
de base comme indiqué au Détail “A”.
• Utiliser des cales en bois lors du levage pour éviter que les élingues
n’endommagent le haut de l’appareil.
• Le poids maximum inclut la configuration de base, le poids de la palette
d'expédition, ainsi que toutes les options pouvant être installées en usine (FIOP)
pour la plateforme sélectionnée.
• La dimension de "B" provient de la configuration de base qui inclut l'option
economizer seulement, Cette dimension peut varier légèrement en fonction
des différentes options sélectionnées installées en usine (FIOP).
• Barres d'écartement requises pour soulever et transporter l'unité.
REQUIRED
“C”
“B”
“A”
914-1371
(36"-54")
SPREADER
BARS
SEE DETAIL “A”
VOIR DÉTAIL “A”
PLACE ALL SEAL STRIP IN PLACE
BEFORE PLACING UNIT ON ROOF CURB.
INSTALLER TOUTES LES BANDES
D’ISOLATION EN PLACE AVANT DE
PLACER L’APPAREIL SUR LE REBORD
DE TOIT. DUCT END
PASSAGES CONDUITES
MAX WEIGHT
LB
1145
1080
KG
520
491
IN
88
88
MM
2235
2235
IN
32
30 3/8
MM
812
772
IN
49 1/2
49 1/2
MM
1257
1257
MODEL
48LC_007
50LC_007
DETAIL A
DÉTAIL “A”
AB C
48TM504503 REV -
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER

11
Fig. 8 — Location of Notches
Fig. 9 — Horizontal Duct Panels In Place
Step 8 — Install Outside Air Hood
ECONOMIZER HOOD PACKAGE REMOVAL AND
SETUP - FACTORY OPTION
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 compart-
ment behind the indoor coil access panel. The hood assem-
bly’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. 10)
Fig. 10 — Access Panel Locations
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. 11.) Be
careful to not damage any wiring or cut tie-wraps securing
any wiring.
Fig. 11 — Economizer Hood Parts Location
4. Carefully lift the hood assembly (with metal tray) through
the filter access opening and assemble per the steps out-
lined in Economizer Hood, below.
ECONOMIZER 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. 12.
BASEPAN
NOTCHES NOTCHES
SCREWS
DUCT COVERS
SHEET METAL
FACE UP
BASEPAN
FILTER
ACCESS
PANEL
INDOOR COIL
ACCESS PANEL
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)

12
Fig. 12 — Indoor Coil Access Panel Relocation
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 pro-
vided to attach the hood sides to the unit. See Fig. 13.
Fig. 13 — Economizer Hood Construction
3. Remove the shipping tape holding the economizer baro-
metric relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See
Fig. 13 and Fig. 14. Secure hood divider with 2 screws on
each hood side. The hood divider is also used as the bot-
tom 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. 14.
6. Caulk the ends of the joint between the unit top panel and
the hood top.
7. Replace the filter access panel.
Fig. 14 — Economizer Filter Installation
Step 9 — Install Flue Hood
The flue hood is shipped screwed to the basepan beside the
burner compartment access panel. Remove from shipping loca-
tion and using screws provided, install flue hood and screen in
location shown in Fig. 15.
Fig. 15 — Flue Hood Details
Step 10 — Install Gas Piping
Installation of the gas piping must be in 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 in 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 fuel at el-
evations 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 ac-
cessory 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.
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 48LCF/T007 (high-heat)
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

13
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. For liquified petroleum applications, the gas
pressure must not be less than 11 in. wg (2740 Pa) or greater than
13.0 in. wg (3240 Pa) at the unit connection. See Tables 3 and 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 3/4-in. FPT gas inlet port on the unit gas valve.
Manifold pressure is factory-adjusted for natural gas (NG) fuel
use. Adjust as required to obtain best flame characteristics. See
Table 5.
Manifold pressure for liquid propane (LP) fuel use must be ad-
justed to specified range. Follow instructions in the accessory
kit to make initial readjustment. See Table 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) between 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: hori-
zontally from outside the unit (across the roof), thru-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. 16.
Fig. 16 — Gas Piping Guide (with Accessory
Thru-the-Curb Service Connections)
FACTORY-OPTION THRU-BASE CONNECTIONS (GAS
CONNECTIONS)
This service connection kit consists of a 3/4-in. NPT gas adapt-
er fitting (brass), two 1/2-in. electrical bulkhead connectors and
a 3/4-in. electrical bulkhead connector, all factory-installed in
the embossed (raised) section of the unit basepan in the con-
denser section.
Fig. 17 — Fittings
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 3/4-in. NPT street elbow on the thru-base gas fitting.
Attach a 3/4-in. pipe nipple with minimum length of 16-in.
(406 mm) (field-supplied) to the street elbow and extend it
through the access panel at the gas support bracket. See
Fig. 18.
Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE MIN MAX
48LCD/E/S/R0 07 4.0 in. wg
(996 Pa)
13.0 in. wg
(3240 Pa)
48LCF/T0
(High Heat units only) 07 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
48LCD/F/E/S/R/T0 07 11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
Table 5 — Natural Gas Manifold Pressure Ranges
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
48LCD/E/S/R0 07 3.5 in. wg
(872 Pa)
1.7 in. wg
(423 Pa)
48LCF/T0
(High Heat units only) 07 3.5 in. wg (872 Pa)
2.0 in. wg
(498 Pa)
Table 6 — Liquid Propane Manifold Pressure Ranges
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
48LCD/E/S/R0 07 10.0 in. wg
(2490 Pa)
5.0 in. wg
(1245 Pa)
48LCF/T0
(High Heat units only) 07 10.0 in. wg (2490 Pa)
5.7 in. wg
(1420 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 in-
staller MUST use a backup wrench to prevent damage to
the valve.
LEGEND
*Field supplied.
NOTE: Follow all local codes.
NFGC – National Fuel Gas Code
STEEL PIPE
NOMINAL DIAMETER
(in.)
SPACINGOFSUPPORTS
X DIMENSION
(ft)
1/2
3/4or 1
11/4or larger
6
8
10
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
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR 3TO 6 TON UNITS.

14
Fig. 18 — Gas Line Piping for 6 Ton Units
Other hardware required to complete the installation of the gas
supply line will include 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 pressure). 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. 19 and 20 for
typical piping arrangements for gas piping that has been routed
through the sidewall of the curb. See Fig. 21 for typical piping
arrangement when thru-base is used. Ensure 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. 19 — Gas Piping with Direct Drip Leg
Fig. 20 — Gas Piping with Offset Drip Leg
Fig. 21 — Gas Piping Thru-Base Connections
When installing the gas supply line, observe local codes per-
taining to gas pipe installations. Refer to the NFPA 54/ANSI
Z223.1 NFGC latest edition (in Canada, CAN/CSA B149.1).
In the absence of local building codes, adhere to the following
pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe 1/4-in.
in every 15 ft (7 mm in every 5 m) to prevent traps. Grade
all horizontal runs downward to risers. Use risers to con-
nect to heating section and to meter.
2. 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.
3. 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.
4. 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
EMBOSSMENT BRASS FITTING
FOR 3-6 TON UNITS
SUPPORT
BRACKET
9”(229mm) MIN
UNION
SHUT OFF
VALVE
DRIP
LEG
THRU-CURB ADAPTER
UNIT BASE RAIL
1. Teflon is a registered trademark of DuPont.
SHUT OFF
VALVE
UNION
9” (229 mm) MIN
UNIT BASE RAIL
BURNER
ACCESS
PANEL
THRU-CURB ADAPTER
DRIP
LEG

15
disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig (3450 Pa).
Pressure test the gas supply piping system at pressures equal to or
less than 0.5 psig (3450 Pa). The unit heating section must be iso-
lated 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 if 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. 22.
Fig. 22 — Orifice Hole
Step 11 — 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 bot-
tom. See Fig. 23. Unit airflow configuration does not deter-
mine which drain connection to use. Either drain connection
can be used with vertical or horizontal applications.
To use the alternate bottom drain connection, remove the red
drain plug from the bottom connection (use a 1/2-in. square sock-
et drive extension) and install it in the side drain connection.
The piping for the condensate drain and external trap can be
completed after the unit is in place. See Fig. 24.
All units must have an external trap for condensate drainage.
Install a trap at least 4-in. (102 mm) deep and protect against
freeze-up. If drain line is installed downstream from the exter-
nal trap, pitch the line away from the unit at 1-in. per 10 ft
(25 mm in 3 m) of run. Do not use a pipe size smaller than the
unit connection (3/4-in.).
Fig. 23 — Condensate Drain Pan (Side View)
Fig. 24 — Condensate Drain Piping Details
Step 12 — 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 according to required operation of the convenience out-
let. If an always-energized convenience outlet operation is de-
sired, 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 de-
sired, connect the source leads to the load side of the unit dis-
connect. On a unit without a unit-mounted disconnect, connect
the source leads to compressor contactor C and indoor fan con-
tactor IFC pressure lugs with unit field power leads (see
Fig. 25).
WARNING
Failure to follow this warning could result in personal inju-
ry, 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.
BURNER
ORIFICE
WARNING
Failure to follow this warning could result in personal inju-
ry or death.
Do not use gas piping as an electrical ground.
Unit cabinet must have an uninterrupted, unbroken electri-
cal ground to minimize the possibility of personal injury if
an electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control com-
partment, 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 electrical codes.
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. (102 mm) trap isrecommended.
MINIMUM PITCH
1”(25mm) PER
10’ (3m) OF LINE
BASE RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
SEE NOTE
3in. (76 mm)
MIN

16
Refer to Fig. 40 for power transformer connections and the dis-
cussion on connecting the convenience outlet on page 25.
Field power wires will be connected at line-side pressure lugs
on the power terminal block or at factory-installed option non-
fused disconnect or HACR.
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 ar-
rangement), at factory-installed option non-fused disconnect
switch or HACR. Max wire size is #4 AWG (copper only) per
pole on contactors and #2ga AWG (copper only) per pole on
optional non-fused disconnect or HACR. See Fig. 25 and the
unit label diagram for field power wiring connections.
NOTE: TEST LEADS - Unit may be equipped with short leads
(pigtails) on the field line connection points on contactor C or op-
tional disconnect switch. These leads are for factory run-test pur-
poses only; remove and discard before connecting field power
wires to unit connection points. Make field power connections di-
rectly to line connection pressure lugs only.
Fig. 25 — Power Wiring Connections
See Fig. 26 for disconnect switch information. See Fig. 27-33
for wiring diagrams.
Fig. 26 — Disconnect Switch and Unit
Disconnect
per
NEC
11 13 13
L1 L2 L3
CIFC
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
3
Ground
(GR)
Equip
GR Lug
Equip GR Lug
Ground
(GR)
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, or property damage.
Do not connect aluminum wire between disconnect switch
and unit. Use only copper wire.
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE

17
Fig. 27 — 48LC 07 Electro-mechanical Control Wiring Diagram

18
Fig. 28 — 48LC 07 RTU Open Control Wiring Diagram

19
Fig. 29 — 48LC 07 SystemVu™ Control Wiring Diagram

20
Fig. 30 — 48LC 07 Power Wiring Diagram, Electro-mechanical and RTU Open Controls
(208/230v and 460v Units)