International comfort products RGS036 Series User manual

509 01 3522 00 03/2015
Specifications are subject to change without notice.
INSTALLATION INSTRUCTIONS
R--410A Single--Package Rooftop Gas Heating /
Electric Cooling
RGS036--072
NOTE: Read the entire instruction manual before starting
the installation
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
Rated Indoor Airflow (cfm) 3.....................
INSTALLATION 6...............................
Jobsite Survey 6................................
Step 1 -- Plan for Unit Location 6..................
Roof Mount 7...............................
Step 2 -- Plan for Sequence of Unit Installation 7......
Curb--Mount Installation 7.....................
Pad--Mount Installation 7......................
Frame--Mount Installation 7....................
Step 3 -- Inspect Unit 7...........................
Step 4 -- Provide Unit Support 8...................
Roof Curb Mount 8..........................
Slab Mount (Horizontal Units Only) 8...........
Alternate Unit Support
(In Lieu of Curb or Slab Mount) 8..............
Step 5 -- Field Fabricate Ductwork 10...............
Step 6 -- Rig and Place Unit 10....................
Positioning on Curb 11.......................
Step 7 -- Convert to Horizontal & Connect Ductwork 11.
Step 8 -- Install Outside Air Hood 11...............
Economizer and Two Position Damper Hood
Package Removal and Setup — Factory Option 11.
Economizer Hood and Two--Position Hood 12.....
Step 9 -- Install Flue Hood 12.....................
Step 10 -- Install Gas Piping 12....................
Factory--Option Thru--Base Connections
(Gas Connections) 13.........................
Step 11 -- Install External Condensate Trap and Line 15..
Step 12 -- Make Electrical Connections 16...........
Field Power Supply 16........................
Units with Factory--Installed
Non--Fused Disconnect 16.....................
Units without Factory--Installed
Non--Fused Disconnect 17.....................
All Units 17................................
Convenience Outlets 18.......................
Factory--Option Thru--Base Connections
(Electrical Connections) 18....................
Units without Thru--Base Connections 18.........
Field Control Wiring 19.......................
Thermostat 19...............................
Unit without Thru--Base Connection Kit 19.......
Heat Anticipator Settings 19...................
EconoMi$er X (Factory--Installed Option) 19.......
Hot Gas Re--Heat Control Connections 20..........
Hot Gas Re--Heat -- Space RH Controller 20......
Smoke Detectors 22...........................
Step 13 -- Adjust Factory--Installed Options 25........
Step 14 -- Install Accessories 25...................
START--UP CHECKLIST 27.......................

2509 01 3522 00
Specifications are subject to change without notice.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agency, or your distributor or branch for
information or assistance. The qualified installer or
agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in USA, ANSI/NFPA 70,
National Electrical Code (NEC); in Canada, CSA C22.1)
for special requirements.
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--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.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect gas piping from unit when leak testing at
pressure greater than 0.5 psig (3450 Pa). Pressures
greater than 0.5 psig (3450 Pa) will cause gas valve
damage resulting in hazardous condition. If gas valve
is subjected to pressure greater than 0.5 psig (3450
Pa), it must be replaced before use. When pressure
testing field--supplied gas piping at pressures of 0.5
psig (3450 Pa) or less, a unit connected to such piping
must be isolated by closing the manual gas valve.
!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.
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 repair or final unit disposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
!WARNING
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.
CAUTION
!

509 01 3522 00 3
Specifications are subject to change without notice.
Rated Indoor Airflow (cfm)
The table to the right lists the rated indoor airflow used
for the AHRI efficiency rating for the units covered in this
document.
Model Number Full Load Airflow (cfm)
RGS036 1275
RGS048 1400
RGS060 1800
RGS072 2200
MODEL NOMENCLATURE
MODEL SERIES RGS0 3 6HDAA0AAA
Position Number
12345678910111213
14
Type
Voltage
Heating Capacity
Outdoor Air Options / Control
0A = No Options
AT = Non−powered 115v C.O.
4B = Non−Fused Disconnect
BR = Supply Air Smoke Detector
AA = Easy Access Hinged Panels Factory Installed Options
1
A = Aluminum / Copper Cond & Evap Coil
B = Precoat Alum/Copper Cond with Alum / Copper Evap (3 phase only)
C = E−Coated Alum/Copper Cond with Alum / Copper Evap (3 phase only)
D = E−Coated Alum / Copper Cond & Evap (3 phase only)
E = Copper/Copper Cond & Alum/Copper Evap (3 phase only)
F = Copper/Copper Cond & Evap (3 phase only) Condenser / Evaporator Coil Configuration
A = Standard Single Speed Indoor Fan Motor. For W7212 Controls
B = Standard Single Speed Indoor Fan Motor. For W7220 Controls Motor Type Option
NOTE: Factory installed options are NOT available on single phase models. This includes economizers and 2 position dampers.
1
Combinations of FIOPS are available.
Efficiency
Motor Option (Indoor Fan)
036 = 3 Tons
048 = 4 Tons
060 = 5 Tons
072 = 6 Tons
K = 208/230−1−60
H = 208/230−3−60
L = 460−3−60
S = 575−3−60
D = Low Heat S = Low Heat, Stainless Steel Heat Exchanger
E = Medium Heat R = Medium Heat, Stainless Steel Heat Exchanger
F = High Heat T = High Heat, Stainless Steel Heat Exchanger
L = Low Heat, Low NOx
M = Medium Heat, Low NOx
N = High Heat, Low NOx
A = Belt Drive, Standard Static Motor
B = Belt Drive, High Static Motor
C = Belt Drive, Medium Static Motor
X = Direct Drive, Standard Static (3, 4, and 5 ton models only)
A = None
B = Economizer w/Baro−relief, OA Temp sensor
E = Economizer w/Baro−relief + CO2Sensor, OA Temp sensor
H = Economizer w/Baro−relief, enthalpy sensor
L = Economizer w/Baro−relief + CO2Sensor, enthalpy sensor
U = Temp Ultra Low Leak Economizer w/Baro−relief
W = Enthalpy Ultra Low Leak Economizer w/Baro−relief
P = 2−Position damper
R = Rooftop
G = Gas/Electric
S = Standard ASHRAE 90.1-2010 Efficiency
Nominal Cooling Capacity
C150163

4509 01 3522 00
Specifications are subject to change without notice.
C150164
Fig. 1 -- Unit Dimensional Drawing

509 01 3522 00 5
Specifications are subject to change without notice.
C150165
Fig. 1 -- Unit Dimensional Drawing (cont.)

6509 01 3522 00
Specifications are subject to change without notice.
C
B
A
D
C08337
LOCATION DIMENSION CONDITION
A
48---in (1219 mm)
18---in (457 mm)
18---in (457) mm
12---in (305 mm)
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
B
42---in (1067 mm)
36---in (914 mm)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
Check sources of flue products within 10--- ft of unit fresh air intake hood
C36---in (914 mm)
18---in (457 mm)
Side condensate drain is used
Minimum clearance
D
48---in (1219 mm)
42---in (1067 mm)
36---in (914 mm
Special
No flue discharge accessory installed, surface is combustible material
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
Check for adjacent units or building fresh air intakes within 10---ft of this unit’s flue outlet
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application
planning overhead obstruction or for vertical clearances.
Fig. 2 -- Service Clearance Dimensional Drawing
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installa-
tion 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, around and above unit as specified in unit
drawings. See Fig. 2.
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 (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
water from higher level runoff and overhangs to fall onto
the unit.

509 01 3522 00 7
Specifications are subject to change without notice.
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
adjacent 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 Step 11 — Install External
Condensate Trap and Line – for required trap dimensions.
Roof Mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences 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 —
Install curb
Install field--fabricated ductwork inside curb
Install accessory thru--base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 11 for
details)
Rig and place unit
Install outdoor air hood
Install flue hood
Install gas piping
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad--mounted Installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field--fabricated ductwork at unit duct openings
Install outdoor air hood
Install flue hood
Install gas piping
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame--mounted Installation —
Frame--mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation 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.
Table 1 – Operating Weights
RGS UNITS LB (KG)
036 048 060 072
Base Unit 483 (219) 537 (244) 569 (258) 652 (296)
Economizer
Vertical 50 (23) 50 (23) 50 (23) 50 (23)
Horizontal 80 (36) 80 (36) 80 (36) 80 (36)
Hot Gas Re---Heat System N/A N/A N/A 41 (15)
Cu Fins 25 (11) 43 (20) 56 (25) 73 (33)
Unpowered Outlet 32 (15) 32 (15) 32 (15) 32 (15)
Curb
14---in/356 mm 110 (50) 110 (50) 110 (50) 110 (50)
24---in/610 mm 145 (66) 145 (66) 145 (66) 145 (66)

8509 01 3522 00
Specifications are subject to change without notice.
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 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. 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 show in
Fig. 3. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
C06110
Fig. 3 -- 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 basepan 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 obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb
if required.
Alternate Unit Support
(InLieuofCurborSlabMount)—
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.

509 01 3522 00 9
Specifications are subject to change without notice.
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] NPTCRRFCURB002A01
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]
ECN NO.APP'DCHK'DBYDATEREVISION RECORDREV
1067898--MMC04/22/13
OVERALL DIM. 5'-7 3/8" WAS 5'-7 7/8; 18GA MATERIAL WA 16 GA.; NAIL FIELD SUPPLIED WAS WITH CURB
A
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
1041738 CURB ASY, ROOF
ENGINEERING MANUFACTURING (004-007)
ENGINEERING REQUIREMENTS ----SIZE DRAWING NUMBER REV
T-005, Y-002 DRAFTER CHECKER
D48TC400427 B
WEIGHT:
-MMC 06/17/11 - -
SHEET 5 OF 5
SURFACE FINISH MFG/PURCH MODEL (INTERNAL USE ONLY) NEXT DRAWING SCALE DISTRIBUTION
- PURCH - N/A MMC
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)
CERTIFIED DRAWING
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-E
SECTION
C13310
Fig. 4 -- Roof Curb Details

10 509 01 3522 00
Specifications are subject to change without notice.
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 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.
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
!
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 1 and
Fig. 5 for additional information.
Lifting holes are provided in base rails as shown in Fig. 5.
Refer to rigging instructions on unit.
Rigging materials under unit (cardboard to prevent base
pan damage) 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 pan 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.
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.
CAUTION
!
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
C11292
UNIT MAX WEIGHT DIMENSIONS A B C
LB KG IN MM IN MM IN MM
RGS036 520 236 74.5 1890 38.0 965 33.5 850
RGS048 575 261 74.5 1890 38.0 965 41.5 1055
RGS060 605 274 74.5 1890 37.5 955 41.5 1055
RGS072 690 313 74.5 1890 37.5 955 41.5 1055
NOTES:
1. SPREADER BARS 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. 5 -- Rigging Details

509 01 3522 00 11
Specifications are subject to change without notice.
PositioningonCurb—
Position unit on roof curb so that the following clearances
are maintained: 1/4in. (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 1/4in.
(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 inches (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 and remove
covers. Using the same screws, install covers on vertical
duct openings with the insulation--side down. Seals around
duct openings must be tight. See Fig. 6
C06108
Fig. 6 -- Horizontal Conversion Panels
Field--supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building 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.
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
(--K 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 us-
ing 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. 7.)
FILTER ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL
COMPRESSOR
ACCESS PANEL
C06023
Fig. 7 -- Typical 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. 8) Be careful to not damage any wiring or cut
tie--wraps securing any wiring.
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
C08639
Fig. 8 -- Economizer and Two--Position Damper
Hood Parts Location

12 509 01 3522 00
Specifications are subject to change without notice.
4. Carefully lift the hood assembly (with metal tray)
through the filter access opening and assemble per the
steps outlined in Economizer Hood and Two–Position
Hood, below.
Economizer Hood 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 bot-
tom of the indoor coil access panel. See Fig. 9.
TOP
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
PANEL
C06025
Fig. 9 -- 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 provided to attach the hood sides to the unit.
See Fig. 10.
B
TOP
PANEL
INDOOR COIL
ACCESS PANEL
19 1/16”
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
33 3/8”
(848mm)
(483mm)
C06026
Fig. 10 -- Economizer Hood Construction
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. 10 and 11. 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. 11.
6. Caulk the ends of the joint between the unit top panel
and the hood top.
7. Replace the filter access panel.
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
C08634
Fig. 11 -- Economizer Filter Installation
Step 9 — 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. 12.
BLOWER
ACCESS
PANEL
C07081
Fig. 12 -- Flue Hood Details
Step 10 — Install Gas Piping
Installation of the gas piping must be accordance with
local building codes and with applicable national codes.
In U.S.A., refer 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 fuel
at elevations up to 2000 ft (610 m) above sea level. Unit

509 01 3522 00 13
Specifications are subject to change without notice.
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. 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.
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE MIN MAX
RGS 036, 048, 060, 072 4.0 in. wg
(996 Pa)
13.0 in. wg
(3240 Pa)
Table 3 – Liquid Propane Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE MIN MAX
RGS 036, 048, 060, 072 11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
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 NG fuel use.
Adjust as required to obtain best flame characteristics.
Table 4 – Natural Gas Manifold Pressure Ranges
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
RGS 036, 048, 060, 072 3.5 in. wg
(872 Pa)
1.7 in. wg
(423 Pa)
Manifold pressure for LP fuel use must be adjusted to
specified range. Follow instructions in the accessory kit to
make initial readjustment.
Table 5 – Liquid Propane Manifold Pressure Ranges
UNIT MODEL UNIT SIZE HIGH FIRE LOW FIRE
RGS 036, 048, 060, 072 10.0 in. wg
(2490 Pa)
5.0 in. wg
(1245 Pa)
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage
to equipment.
When connecting the gas line to the unit gas valve,
the installer MUST use a backup wrench to prevent
damage to the valve.
CAUTION
!
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:
horizontally 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. 13.
LEGEND
*
Field supplied.
NOTE: Follow all local codes.
NFGC – National Fuel Gas Code
STEEL PIPE
NOMINAL DIAMETER
(in.)
SPACINGOFSUPPORTS
X DIMENSION
(ft)
1/2
3/4
or 1
1
1/4
or 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
C11091
Fig. 13 -- 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-- i n N P T g a s
adapter fitting (brass), a 1/2--in electrical bulkhead
connector and a 3/4--in electrical bulkhead connector, all
factory--installed in the embossed (raised) section of the
unit basepan in the condenser section.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR 3 TO 6 TON UNITS.
C13410
Fig. 14 -- Thru--Base Connection Fittings

14 509 01 3522 00
Specifications are subject to change without notice.
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. Attach 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 access panel at the gas support
bracket. See Fig. 15.
EMBOSSMENT BRASS FITTING
FOR 3-6 TON UNITS
SUPPORT
BRACKET
C08016
Fig. 15 -- Gas Line Piping for 3 to 6 Ton Units Only
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 Figures
16 and 17 for typical piping arrangements for gas piping that
has been routed through the sidewall of the curb. See Fig. 18
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.
9” (229mm) min
Union
Shut Off
Valve
Drip
Leg
Thru-Curb Adapter
Unit Base Rail
C07469
Fig. 16 -- Gas Piping
Drip
Leg
Shut Off
Valve
Union
Thru-Curb Adapter
Burner
Access
Panel
9” (229mm) min
Unit Base Rail
C07470
Fig. 17 -- Gas Piping
C08018
Fig. 18 -- Gas Piping Thru--Base Connections

509 01 3522 00 15
Specifications are subject to change without notice.
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 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 connect to heating section and to meter.
2. Protect all segments of piping system against physical
and thermal damage. Support all piping with appro-
priate straps, hangers, etc. Use a minimum of one
hanger every 6 ft (1.8 m). For pipe sizes larger than
1/2--in., follow recommendations of national codes.
3. Apply joint compound (pipe dope) sparingly and only
to male threads of joint when making pipe connec-
tions. Use only pipe dope that is resistant to action of
liquefied petroleum gases as specified by local and/or
national codes. If using PTFE (Teflon) tape, ensure
the material is Double Density type and is labeled for
use on gas lines. Apply tape per manufacturer’s in-
structions.
4. Pressure--test all gas piping in accordance with local
and national plumbing and gas codes before connect-
ing 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). 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 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).
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
SConnect gas pipe to unit using a backup wrench to
avoid damaging gas controls.
SNever purge a gas line into a combustion chamber.
SNever 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.
SUse proper length of pipe to avoid stress on gas
control manifold.
!WARNING
NOTE: If orifice hole appears damaged or it is suspected
to have been redrilled, check orifice hole with a numbered
drill bit of correct size. Never redrill an orifice. A
burr--free and squarely aligned orifice hole is essential for
proper flame characteristics.
BURNER
ORIFICE
A93059
Fig. 19 -- 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 bottom. See Fig. 20. 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-- i n .
square socket 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. 21.
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
C08021
Fig. 20 -- Condensate Drain Pan (Side View)
NOTE: If the alternate bottom drain is not used check the
drain plug for tightness prior to setting the unit on the roof
curb.

16 509 01 3522 00
Specifications are subject to change without notice.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102) trap is recommended.
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE BASE RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
SEE NOTE
2˝(51) MIN
C08022
Fig. 21 -- Condensate Drain Piping Details
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 external 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.).
Step 12 — Make Electrical Connections
ELECTRICAL SHOCK HAZARD
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 electrical wire connected to
unit ground lug in control compartment, 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.
!WARNING
NOTE: Field--supplied wiring shall conform with the
limitations of minimum 63_F(33_C) rise.
Field Power Supply —
Field power wires are connected to the unit at line--side
pressure lugs on compressor contactor C and indoor fan
contactor IFC (see wiring diagram label for control box
component arrangement) or at factory--installed option
non--fused disconnect switch. Max wire size is #2 AWG
(copper only). (See Fig. 22.)
NOTE: TEST LEADS -- Unit may be equipped with
short leads (pigtails) on the field line connection points on
contactor C or optional disconnect switch. These leads are
for factory run--test purposes only; remove and discard
before connecting field power wires to unit connection
points. Make field power connections directly to line
connection pressure lugs only.
C
11 23
Disconnect
per
NEC
208/230-1-60
or
Disconnect
per
NEC
11 13 13 23
L1 L2 L3
BLK YEL BLU
TB
C IFC 1-ph Belt Drive IFM
(230 & 460-V)
or
Direct Drive IFM
(575-V only)
208/230-3-60
460-3-60
575-3-60
Units Without Disconnect Option
Units With Disconnect Option
L1
L2
L3
2
4
6
1
3
5
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
1-ph Belt Drive IFM
(575-V only)
C11382
Fig. 22 -- Power Wiring Connections
!WARNING
FIRE HAZARD
Failure to follow this warning could result in
intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and RGS unit. Use only copper wire.
(See Fig. 23.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 23 -- Disconnect Switch and Unit
Units with Factory--Installed Non--Fused Disconnect —
The factory--installed option non--fused disconnect (NFD)
switch is located in a weatherproof enclosure located
under the main control box. The manual switch handle and
shaft are shipped in the disconnect enclosure. Assemble the
shaft and handle to the switch at this point. Discard the
factory test leads (see Fig. 22).
Connect field power supply conductors to LINE side
terminals when the switch enclosure cover is removed to
attach the handle.

509 01 3522 00 17
Specifications are subject to change without notice.
C12278
Fig. 24 -- Location of Non--Fused Disconnect Enclosure
To field install the NFD shaft and handle:
1. Remove the unit front pane (see Fig. 1).
2. Remove (3) hex screws on the NFD enclosure -- (2) on
the face of the cover and (1) on the left side cover.
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.
6. Measure from the tip of the shaft to the top surface of
the black pointer; the measurement should be 3.75 --
3.88 in. (95 -- 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
pointing 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.
C12279
Fig. 25 -- Handle and Shaft Assembly for NFD
Units Without Factory--Installed
Non--Fused Disconnect —
When installing units, provide a disconnect switch per
NEC (National Electrical Code) of adequate size.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
All Units —
All field wiring must comply with NEC and all local
codes. Size wire based on MCA (Minimum Circuit Amps)
on the unit informative plate. See Fig. 22 and the unit
label diagram for power wiring connections to the unit
power terminal blocks and equipment ground. Maximum
wire size is #2 ga AWG (copper only) per pole on
contactors.
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refer to unit informative data plate for
MOCP (Maximum Over--current Protection) device size.
All field wiring must comply with the NEC and local
requirements.
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is
to be connected to a 208-v power supply, the control
transformer must be rewired by moving the black wire
with the 1/4-in. female spade connector from the 230--v
connection and moving it to the 200-v 1/4-in. male
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information. Field power
wires will be connected line--side pressure lugs on the
power terminal block or at factory--installed option
non--fused disconnect.
NOTE: Check all factory and field electrical connections
for tightness.

18 509 01 3522 00
Specifications are subject to change without notice.
Convenience Outlets —
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
its disconnect switch, if appropriate, and open it.
Lock--out and tag--out this switch, if necessary.
!WARNING
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Control Box
Access Panel
C08128
Fig. 26 -- Convenience Outlet Location
Non--powered Convenience Outlet: These outlets require
the field installation of a general--purpose 125--volt 15--A
circuit powered from a source elsewhere in the building.
Observe national and local codes when selecting wire
size, fuse or breaker requirements and disconnect switch
size and location. Route 125--v power supply conductors
into the bottom of the utility box containing the duplex
receptacle.
Installing Weatherproof Cover: A weatherproof
while-in-use cover for the factory-installed convenience
outlets is now required by UL standards. This cover
cannot be factory-mounted due its depth; it must be
installed at unit installation. For shipment, the
convenience outlet is covered with a blank cover plate.
The weatherproof cover kit is shipped in the unit’s control
box. The kit includes the hinged cover, a backing plate and
gasket.
DISCONNECT ALL POWER TO UNIT AND
CONVENIENCE OUTLET. LOCK--OUT AND TAG--OUT
ALL POWER.
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until
approximately 1/2-in (13 mm) under screw heads are
exposed. Press the gasket over the screw heads. Slip the
backing plate over the screw heads at the keyhole slots
and align with the gasket; tighten the two screws until
snug (do not over-tighten).
Mount the weatherproof cover to the backing plate as
shown in Fig. 27. Remove two slot fillers in the bottom of
the cover to permit service tool cords to exit the cover.
Check for full closing and latching.
RECEPTACLE
NOT SHOWN
COVER – WHILE-IN-USE
WEATHERPROOF
BASE PLATE FOR
GFCI RECEPTACLE
C09022
Fig. 27 -- Weatherproof Cover Installation
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing
if the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.
Factory--Option Thru--Base Connections
(Electrical Connections) —
This service connection kit consists of a 1/2-- i n N P T g a s
adapter fitting (brass), a 1/2--in electrical bulkhead
connector and a 3/4--in electrical bulkhead connector, all
factory--installed in the embossed (raised) section of the
unit basepan in the condenser section. The 3/4-- i n
bulkhead connector enables the low--voltage control wires
to pass through the basepan. The 1/2--in electrical
bulkhead connector allows the high--voltage power wires
to pass through the basepan. See Fig. 14.
Check tightness of connector lock nuts before connecting
electrical conduits.
Field--supplied and field--installed liquid tight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped)
or to the external disconnect (through unit side panel). A
hole must be field cut in the main control box bottom on
the left side so the 24--v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.
Units without Thru--Base Connections —
1. Install power wiring conduit through side panel
openings. Install conduit between disconnect and
control box.
2. Install power lines to terminal connections as shown
in Fig. 22.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 6. On 3--phase units, voltages between phases must

509 01 3522 00 19
Specifications are subject to change without notice.
be balanced within 2% and the current within 10%. Use
the formula shown in the legend for Table 6, Note 2 to
determine the percent of voltage imbalance. Operation on
improper line voltage or excessive phase imbalance
constitutes abuse and may cause damage to electrical
components. Such operation would invalidate any
applicable ICP warranty.
Field Control Wiring —
The RGS unit requires an external temperature control
device. This device can be a thermostat emulation device
provided as part of a third--party Building Management
System.
Thermostat —
Install a approved accessory thermostat according to
installation instructions included with the accessory. For
complete economizer function, select a two--stage cooling
thermostat. Locate the thermostat accessory on a solid
wall in the conditioned space to sense average
temperature in accordance with the thermostat installation
instructions.
If the thermostat contains a logic circuit requiring 24--v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24--v source (no “C”
connection required), use a thermostat cable or equivalent
with minimum of six leads. Check the thermostat
installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire [35_C(95_F)
minimum]. For 50 to 75 ft. (15 to 23 m), use no. 16 AWG
insulated wire [35_C(95_F) minimum]. For over 75 ft.
(23 m), use no. 14 AWG insulated wire [35_C(95_F)
minimum]. All wire sizes larger than no. 18 AWG cannot
be directly connected to the thermostat and will require a
junction box and splice at the thermostat.
Unit without Thru--Base Connection Kit —
Pass the thermostat control wires through the hole
provided in the corner post; then feed the wires through
the raceway built into the corner post to the control box.
Pull the wires over to the terminal strip on the upper--left
corner of the Controls Connection Board. See Fig. 29.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second--stage heating, when available.
X
C
G
W2
C
W2
G
W1
O/B/Y2 Y2
R
W1
R
Y1 Y1
T
H
E
R
M
O
S
T
A
T
(Note 1) (Note 2)
Note 1: Typical multi-function marking. Follow manufacturer’s configuration
Instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired.
Field Wiring
Central
Terminal
Board
Typical
Thermostat
Connections
C08069
Fig. 28 -- Low--Voltage Connections
NOTE: If thru--the--bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 29 -- Field Control Wiring Raceway
EconoMi$er X (Factory--Installed Option)
For details on operating RGS units equipped with the
factory--installed EconoMi$er X option, refer to
Factory--Installed Economizers for RGH/RAH/RHH/
RGS/RAS/RHS Rooftop Units, 3 to 27.5 Nominal Tons.
Economizer Supplement Related to California Title 24
(Literature number: 50901170301SS, or later).

20 509 01 3522 00
Specifications are subject to change without notice.
C14225
Fig. 30 -- EconoMi$er X W7220 Controller Wiring Diagram
Hot Gas Re--Heat Control Connections
Hot Gas Re--Heat -- Space RH Controller —
NOTE: Hot Gas Re--Heat is a factory installed option
which is available for 072 models only.
The Hot Gas Re--Heat dehumidification system requires a
field--supplied and --installed space relative humidity
control device. This device may be a separate humidistat
control (contact closes on rise in space RH above control
setpoint) or a combination thermostat--humidistat control
device with isolated contact set for dehumidification
control. The humidistat is normally used in applications
where a temperature control is already provided.
To connect a field--supplied humidistat:
1. Route the humidistat 2--conductor cable
(field--supplied) through the hole provided in the unit
corner post.
2. Feed wires through the raceway built into the corner
post (see Fig. 29) to the 24--v barrier located on the
left side of the control box. The raceway provides the
UL--required clearance between high--voltage and
low--voltage wiring.
3. Use wire nuts to connect humidistat cable to two
PINK leads in the low–voltage wiring as shown in
Fig. 32.
% RELATIVE HUMIDITY
C09295I
Fig. 31 -- Accessory Field--Installed Humidistat
To connect the Thermidistat device:
1. Route the Thermostat multi--conductor thermostat
cable (field--supplied) through the hole provided in
the unit corner post.
2. Feed wires through the raceway build into the corner
post (see Fig. 29) to the 24--v barrier located on the
left side of the control box. The raceway provides the
UL--required clearance between high--voltage and
low--voltage wiring.
3. The Thermostat has dry contacts at terminals D1 and
D2 for dehumidification operation (see Fig. 33). The
dry contacts must be wired between CTB terminal R
and the PINK lead to the LTLO switch with
field--supplied wire nuts.