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INSTALLATION INSTRUCTIONS
GUH80X
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
Comfort-Aire / Century
1900 Wellworth Ave.
Jackson, MI 49203
507651-04M
This manual must be left with the homeowner for future reference.
WARNING
CAUTION
Table of Contents
Unit Dimensions ..........................................................2
GUH80X Gas Furnace ................................................3
Shipping & Packing List ...............................................3
Safety Information .......................................................3
General ........................................................................5
Combustion, Dilution & Ventilation Air .........................5
Setting Equipment .......................................................7
Filters .........................................................................10
Duct System ..............................................................10
Venting.......................................................................12
Gas Piping .................................................................18
Electrical ....................................................................20
Unit Start-Up ..............................................................25
Heating Sequence of Operation ...............................27
Gas Pressure Adjustment ..........................................27
Other Unit Adjustments..............................................28
Blower Performance ..................................................29
Service.......................................................................31
Repair Parts List ........................................................32
*P507651-04M*
Issue 2329
Warm Air Gas Furnace
Upflow/Horizontal
Left/Right Air Discharge
(P) 507651-04M
Page 1 of 32
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Summary of Contents for Allied GUH80X
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Page 1: Table Of Contents
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. Table of Contents WARNING Unit Dimensions ............2 GUH80X Gas Furnace ..........3 Improper installation, adjustment, alteration, service Shipping & Packing List ..........3 or maintenance can cause property damage, personal Safety Information ............3 injury or loss of life. -
Page 2: Unit Dimensions
Unit Dimensions NOTE - C5 size units that require air volumes over 1800 cfm must have one of the following: Single side return air and Optional Return Air Base with transition that must accommodate required 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to maintain proper velocity. -
Page 3: Guh80X Gas Furnace
These units are CSA International certified to ANSI Z21.47. In the USA, installation of gas furnaces must conform with The GUH80X unit is shipped ready for installation in the local building codes. In the absence of local codes, units upflow or horizontal position fueled by natural gas. The must be installed according to the current National Fuel furnace is shipped with the bottom panel in place. - Page 4 Installed in Combination with a Cooling Coil Use of Furnace as a Construction Heater When this furnace is used with cooling units, it shall be Units may be used for heating of buildings or structures installed in parallel with, or on the upstream side of, cooling under construction, if the following conditions are met to units to avoid condensation in the heating compartment.
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Page 5: General
NOTWITHSTANDING THE FOREGOING, INSTALLER In addition to providing combustion air, fresh outdoor air IS RESPONSIBLE FOR CONFIRMING THAT THE USE dilutes contaminants in the indoor air. These contaminants OF CONSTRUCTION HEAT IS CONSISTENT WITH may include bleaches, adhesives, detergents, solvents THE POLICIES AND CODES OF ALL REGULATING and other contaminants which can corrode furnace ENTITIES. - Page 6 The requirements for providing air for combustion and ventilation depend largely on whether the furnace is CHIMNEY installed in an unconfined or a confined space. OR GAS VENT Unconfined Space An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 FURNACE WATER...
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Page 7: Setting Equipment
Shipping Bolt Removal CHIMNEY Units with 1/2 hp and 3/4 hp blower motors are equipped OR GAS VENT with three flexible legs and one rigid leg. See Figure 6. The VENTILATION LOUVERS (Each end of attic) rigid leg is equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet OUTLET used with a flexible mounting leg). - Page 8 Return Air - Upflow Applications Return air can be brought in through the bottom or either side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely.
- Page 9 Figure 11. Typical Horizontal Application - Unit Suspended in Attic or Crawlspace NOTE: Heavy gauge perforated sheet metal straps may Figure 9. Single Side Return Air be used to suspend the unit from roof rafters or ceiling (with transition and filter) joists.
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Page 10: Filters
Return Air - Horizontal Applications Return air must be brought in through the end of a furnace WARNING installed in a horizontal application. The furnace is equipped with a removable bottom panel to facilitate installation. See The inner blower panel must be securely in place when Figure 10. - Page 11 NOTE: Do not operate the furnace in the heating mode Tap the 3” to 2” reducer with screen onto the 2” PVC with an external static pressure that exceeds 0.8 inches pipe. See Figure 14 and Figure 15. w.c. Higher external static pressures may cause erratic NOTE: Ensure that there is 4-1/2”...
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Page 12: Venting
SUPPLY SUPPLY Furnace Furnace Figure 16. Duct System and Proper Installation Venting Using a Masonry Chimney Venting The following additional requirements apply when a lined masonry chimney is used to vent this furnace. A 4 inch diameter flue transition is factory installed on the •... - Page 13 DO NOT insulate the space between the liner and the SEALED chimney wall with puffed mica or any other loose granular insulating material. MAX. LENGTH -- SEE NOTE 1 BELOW. A fan assisted furnace may be commonly vented into an 5 ft.
- Page 14 MINIMUM LENGTH = AS SHORT AS PRACTICAL. INTERIOR TILE-LINED FOR MAXIMUM LENGTH SEE NOTE TO LEFT MASONRY CHIMNEY NOTE- Refer to provided venting tables for installations. NOTE - the chimney must be properly sized per provided venting tables or lined with listed metal lining system. VENT CONNECTOR OTHER...
- Page 15 of single wall connector piping shall be fastened by screws or other approved means. 13. When the vent connector used for Category I appliances must be located in or pass through a crawl space, attic or other areas which may be cold, that portion of the vent connector shall be constructed of listed doublewall type B vent material or material having equivalent insulation qualities.
- Page 16 Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category I Appliance Vent and Connector Diameter - D (inches) 3 inch 4 inch 5 inch 6 inch Height H Lateral L (feet) (feet) Appliance Input Rating in Thousands of Btu per Hour NOTE: Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system.
- Page 17 Vent Connector Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Vent and Connector Diameter - D (inches) Vent Connector 3 inch 4 inch 5 inch 6 inch Height H Rise R Appliance Input Rating in Thousands of Btu per Hour (feet)
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Page 18: Gas Piping
Removal of the Furnace from Common Vent Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in In the event that an existing furnace is removed from Appendix G. These are in the current standards of the a venting system commonly run with separate gas National Fuel Gas Code ANSI 2223.1. - Page 19 IMPORTANT Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases. Leak Check After gas piping is completed, carefully check all field- Figure 20. installed piping connections for gas leaks. Use a commercially available leak detecting solution specifically manufactured for leak detection.
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Page 20: Electrical
Left Side Piping Right Side Piping (Standard) (Alternate) AUTOMATIC AUTOMATIC GAS VALVE MANUAL GAS VALVE MANUAL (with manual MAIN SHUT-OFF (with manual MAIN SHUT-OFF VALVE shut-off valve) VALVE shut-off valve) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG DRIP LEG FIELD PROVIDED AND INSTALLED... - Page 21 to one of the provided neutral terminals. If an accessory rated at greater than one amp is connected to this terminal, it is necessary to use an external relay. One line voltage “HUM” 1/4” spade terminal is provided on the furnace integrated control. See Figure 26 or Figure 27 for integrated control configuration.
- Page 22 COMBUSTION AIR INDUCER COMBUSTION AIR PROVING SWITCH BLOWER SPEED CHART FACTORY CONNECTED SPEED TAPS UNIT COOL HEAT PARK BLACK YELLOW BROWN,BLUE BLOWER SPEED SELECTION GAS VALVE PRIMARY GAS SPEED TAPS BLUE BLACK BROWN YELLOW LIMIT FLAME J159 SENSOR P159 FLAME ROLLOUT SWITCH JACK/PLUG CHART IGNITER...
- Page 23 Figure 25. Wiring Diagram - 100 Models 507651-04M Issue 2329 Page 23 of 32...
- Page 24 Red LED Flash Code Diagnostic Codes / Status of Furnace No power to control or control hardware fault detected Heartbeat Normal operation - idle, continuous fan, cool Continuous Rapid Flash Call for heat / burner operation 1 Flash Reverse line voltage polarity 2 Flashes Improper earth ground 3 Flashes...
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Page 25: Unit Start-Up
1/4” Quick Connect Terminal Designations 120V HUM Power for Humidifier (120VAC) LINE Incoming Power Line (120VAC) XFMR Transformer Primary (120VAC) CIRC Indoor Blower Motor (120VAC) Electronic Air Cleaner (120VAC) HUM24 Power For Humidifier (24VAC) NEUTRALS (5) Neutral 3/16” Quick Connect Terminal Designations Cool Speed From Indoor Blower Motor COOL (24VAC) - Page 26 BEFORE LIGHTING smell all around the appliance area Move switch on gas valve to ON. Do not force. See for gas. Be sure to smell next to the floor because some Figure 28. gas is heavier than air and will settle on the floor. Replace the upper access panel.
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Page 27: Heating Sequence Of Operation
Supply Pressure Measurement Heating Sequence of Operation On multiple unit installations, each unit should be checked separately, with and without units operating. Supply When thermostat calls for heat, combustion air blower pressure must fall within range listed in Table 11. starts. -
Page 28: Other Unit Adjustments
SW2-1 SW2-2 Other Unit Adjustments Primary Limit The primary limit is located on the heating compartment vestibule panel. The secondary limits (if equipped) are located in the blower compartment, attached to the back * Factory setting side of the blower. These auto reset limits are factory-set and require no adjustment. -
Page 29: Blower Performance
Electronic Ignition Connect selected speed tap at integrated control speed terminal. The integrated control has an added feature of an internal soft lockout control. The feature serves as an automatic Resecure blower access panel. reset device for integrated control lockout caused by Turn on electrical power to furnace. - Page 30 Page 30 of 32 Issue 2329 507651-04M...
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Page 31: Service
Allowable Heating Speeds Models Yellow Blue Brown Black Not Allowed Factory Setting Allowed Allowed Not Allowed Not Allowed Allowed Factory Setting Allowed Not Allowed Not Allowed Factory Setting Allowed Allowed Not Allowed Not Allowed Factory Setting Allowed Not Allowed Not Allowed Table 14. -
Page 32: Repair Parts List
Perform a general system test. Turn on the furnace to Verify that system total static pressure and airflow check operating functions such as the start-up and shut-off settings are within specific operating parameters. operation. Clock gas meter to ensure that the unit is operating at the specified firing rate.
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