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THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
Improper installation, adjustment, alteration, service, or
maintenance can cause injury or property damage. Refer
to this manual. For assistance or additional information,
consult a licensed professional (or equivalent), HVAC
installer, service agency, or the gas supplier.
Do not store combustible materials, including gasoline
and other flammable vapors and liquids, near the unit,
vent pipe, or warm air ducts. Such actions could cause
property damage, personal injury, or death.
The installation of the unit, wiring, warm air ducts, venting, etc. must conform to the requirements of the National Fire
Protection Association; the National Fuel Gas Code, ANSI Z223.1 (latest edition) and the National Electrical Code, ANSI/
NFPA No. 70 (latest edition) in the United States; the Canadian Installation Codes CAN/CGA-B149.1 & .2 (latest edition)
and the Canadian Electrical Code Part 1, CSA 22.1 (latest edition) in Canada; and any state or provincial laws, local
ordinances, or local gas utility requirements. Local authorities having jurisdiction should be consulted before installation
is made. Such applicable regulations or requirements take precedence over the general instructions in this manual.
508160M02
WARNING
WARNING
Save these instructions for future reference
INSTALLATION AND MAINTENANCE
INSTRUCTIONS
TGRX SERIES UNITS
RESIDENTIAL PACKAGED UNITS
Gas/Electric Ultra Low NOx
508160M02
07/2023
Table of Contents
Unit Dimensions ..........................................................2
Roof Curb Dimensions ................................................4
Adjustable Roof Curb Dimensions...............................6
Installation ...................................................................9
Venting.......................................................................11
Duct System ..............................................................12
Filters .........................................................................12
Condensate Drain......................................................12
Gas Piping .................................................................13
Electrical Wiring ........................................................14
Heating Start-Up .......................................................15
Operation ...................................................................16
Maintenance ..............................................................18
*P508160M02*
CAUTION
Issue 2327
Comfort-Aire / Century
1900 Wellworth Ave.
Jackson, MI 49203
(P) 508160M02
Page 1 of 20
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Page 1: Table Of Contents
INSTALLATION AND MAINTENANCE INSTRUCTIONS TGRX SERIES UNITS RESIDENTIAL PACKAGED UNITS Gas/Electric Ultra Low NOx 508160M02 07/2023 Table of Contents THIS MANUAL MUST BE LEFT WITH THE Unit Dimensions ............2 HOMEOWNER FOR FUTURE REFERENCE Roof Curb Dimensions ..........4 Adjustable Roof Curb Dimensions.......6 Installation ..............9... -
Page 2: Unit Dimensions
Unit Dimensions - Small Base Gas/Electric 47.66 2.48 1.98 2.33 2.33 16.77 14.02 DOWNFLOW DOWNFLOW 18.52 11.49 11.49 RETURN SUPPLY 16.07 TOP VIEW BOTTOM 47.66 POWER ENTRY BOTTOM GAS ENTRY 6.94 3.25 4.56 20.31 21.06 23.19 SIDE VIEWS POWER ENTRY 3.87 1-1/8 DIA. - Page 3 Unit Dimensions - Large Base Gas/Electric 56.13 2.11 2.39 2.33 2.33 19.49 19.49 DOWNFLOW DOWNFLOW 18.52 11.49 11.49 RETURN SUPPLY TOP VIEW 16.07 BOTTOM 47.66 POWER ENTRY BOTTOM GAS ENTRY 6.94 3.25 10.06 25.81 26.56 28.68 SIDE VIEWS 3.87 POWER ENTRY 1-1/8 DIA.
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Page 4: Roof Curb Dimensions
Roof Curb Dimensions - Small Base Gas/Electric 3/4 (19) RETURN Opening for Power Entry OPENING Through Unit Base 5-1/2 x 5-5/8 in. (140 x 31 mm) 16-7/8 44-3/8 (429) (1127) 11-1/2 2-1/8 (287) (54) Insulated Panels 5-3/4 13-7/8 (146) (352) SUPPLY 5-1/2 OPENING... - Page 5 Roof Curb Dimensions - Large Base Gas/Electric 3/4 (19) Opening for Power Entry Through Unit Base 5-1/2 x 5-5/8 in. 19-1/2 (140 x 31 mm) 44-3/8 (380) 11-1/2 2-1/8 (1127) (287) (54) RETURN Insulated OPENING Panels 19-1/2 (380) SUPPLY OPENING 11-1/2 (287) 8 (203)
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Page 6: Adjustable Roof Curb Dimensions
Adjustable Roof Curb Dimensions - Small Base Gas/Electric (Knock-Down Style) CLIPLOCK CORNER DETAIL Top Edge Wood Nailer Strip CURB PROFILE Bottom Flange Typical Slot Typical Locking Tab NOTE: See Cliplock 1000 installation instructions for complete assembly and installation procedures and requirements. 1-3/4 Opening for Power Line Entry thru base... - Page 7 Adjustable Roof Curb Dimensions - Large Base Gas/Electric (Knock-Down Style) CLIPLOCK CORNER DETAIL Top Edge Wood Nailer Strip Bottom Flange CURB PROFILE Typical Slot Typical Locking Tab NOTE: See Cliplock 1000 installation instructions for complete assembly and installation procedures and requirements. 1-3/4 Opening for Power Line Entry thru base...
- Page 8 Adjustable Roof Curb Dimensions (Welded Style) Front Flange 8 (203) NOTE: Unit Base Rail Minimum Clips (4) Height 4 (102) Built-In Rain Sides and Diverter Back Flange (Not Shown) 6 (152) Built-In Drip Edge Unit Base Rail 3/4 (76) Unit Base Rail Clips (4) (152) 42-7/8...
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Page 9: Installation
Installation Unit is designed for outdoor installation only. Unit must be installed so all electrical components are protected These instructions must be saved for future reference. from water. These units are single package air conditioners with gas Condenser coils must have an unlimited supply of air. heat designed for outdoor installation on a rooftop or a For ground level installation, use a level prefabricated slab. - Page 10 Rigging Unit • The return air duct must be provided and sealed to the unit. Exercise care when moving the unit. Do not remove any packaging until the unit is near the place of installation. • Return air temperature range between 55°F (13°C) and 80°F (27°C) must be maintained.
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Page 11: Venting
Venting NOTE: The vent outlet must be installed in a location as to prevent building degradation and must be consistent with the If an existing gas furnace is being removed from a National Fuel Gas Code, Z223.1 or CAN/CGA-B149.1 & common venting system when this packaged unit is installed, then read and follow the instructions in the “Removal of Unit from Common Venting System”... -
Page 12: Duct System
Duct System Unit Model Filter 1 Filter 2 The duct system should be designed and sized according 24, 30, 36 14 x 20 x 1 to the methods in the Air Conditioning Contractors of 20 x 20 x 1 42, 48, 60 20 x 20 x 1 America (ACCA) manual that is most appropriate to the installation application. -
Page 13: Gas Piping
Gas Connection See Figure 2 for proper drain arrangement. The drain line must pitch to an open drain or pump to prevent clogging The gas supply line is routed through the gas entry of the line. Seal around the drain connection with suitable location on the side of the unit (see Figure 3). -
Page 14: Electrical Wiring
CAUTION CAUTION If a flexible gas connector is required or allowed by When connecting electrical power and control wiring the authority that has jurisdiction, black iron pipe shall to the unit, waterproof type connectors must be used be installed at the gas valve and must extend outside so that water or moisture cannot be drawn into the unit the cabinet. -
Page 15: Heating Start-Up
Compressor To Shut Down Main Burners Units are shipped with compressor mountings factory- Turn off electrical power to unit. adjusted and ready for operation. Slide the gas valve switch to the “OFF” position (see Figure 6). CAUTION Post-Start Checklist Do not loosen compressor mounting bolts. After the entire control circuit has been energized and the heating section is operating, make the following checks: Check for gas leaks, using soapy solution, in the unit... -
Page 16: Operation
per revolution. The heating value of the gas can be Blower Delay – Cooling obtained from the local utility. The circulating air blower is controlled by a timing circuit in the integrated blower/ignition control. Timings are not NOTE: Gas input must never exceed the input capacity adjustable. - Page 17 Heating Sequence of Operation Safety Controls When the thermostat calls for heating, R is closed to W. The The control circuit includes the following safety controls: following describes the gas heating sequence of operation. Limit Control A call for heat from the room thermostat signals the This control is located behind the heat exchanger access ignition control to energize the combustion air blower panel and is designed to open at abnormally high circulating...
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Page 18: Maintenance
Maintenance Vent Outlet Visually inspect vent outlet periodically to make sure that Periodic inspection and maintenance normally consists of there is no buildup of soot or dirt. If necessary, clean to changing or cleaning the filters and cleaning the evaporator maintain adequate opening to discharge flue products. - Page 19 Table 5. Cooling Performance - Gas/Electric Models 80 DB / 67 WB Deg. Air Temperature Entering Evaporator Coil, Degree F Return Air Cooling Input Pressure 65° 70° 75° 80° 85° 90° 95° 100° 105° 110° 115° (1000 BTU) Suction Liquid 508160M02 Issue 2327 Page 19 of 20...
- Page 20 Figure 7. Wiring Diagram – Single Phase CT Page 20 of 20 Issue 2327 508160M02...