COMFORT-AIRE GUH80A Installation Instructions Manual

Warm air gas furnace upflow / horizontal left and right air discharge

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Upflow / Horizontal Left and Right Air Discharge

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.

As with any mechanical equipment, personal injury can

result from contact with sharp sheet metal edges. Be

careful when you handle this equipment.

Unit Dimensions ......................................................................2

GUH80A Gas Furnace.............................................................3

Shipping and Packing List .......................................................3

Safety Information ...................................................................3

Use of Furnace as a Construction Heater ...............................4

General ....................................................................................5

Combustion, Dilution & Ventilation Air .....................................5

Setting Equipment ...................................................................8

Filters .....................................................................................11

Duct System ..........................................................................11

*P507713-01*

(P) 507713-01

507713-01

INSTALLATION INSTRUCTIONS

Warm Air Gas Furnace

This manual must be left with the homeowner for future reference.

CAUTION

GUH80A

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.

Venting...................................................................................12

Gas Piping .............................................................................19

Electrical ................................................................................21

Unit Start-Up ..........................................................................25

Heating Sequence Of Operation ..........................................26

Gas Pressure Adjustment .....................................................26

High Altitude ..........................................................................27

Other Unit Adjustments..........................................................28

Service...................................................................................29

Repair Parts List ....................................................................30

Issue 1623

WARNING

Manufactured By

Comfort-Aire / Century

1900 Wellworth Ave.

Jackson, MI 49203

Page 1 of 32

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Summary of Contents for COMFORT-AIRE GUH80A

Page 1: Table Of Contents
(or careful when you handle this equipment. equivalent), service agency or the gas supplier. Table of Contents Unit Dimensions ..............2 Venting...................12 GUH80A Gas Furnace.............3 Gas Piping ................19 Shipping and Packing List ............3 Electrical ................21 Safety Information ..............3 Unit Start-Up ................25 Use of Furnace as a Construction Heater .......4...
Page 2: Unit Dimensions
GUH80A Unit Dimensions - inches (mm) NOTE - 5C and 5D size units installed in upflow applications that require air volumes of 1800 cfm (850 L/s or greater must have one of the following: 1. Single side return air with transition, to accommodate 20 x 25 x 1 in.
Page 3: Guh80A Gas Furnace
GUH80A Gas Furnace The GUH80A gas furnace is shipped ready for installation CAUTION in the upflow or horizontal right position (for horizontal left position the combustion air pressure switch must be moved). As with any mechanical equipment, personal injury can The furnace is shipped with the bottom panel in place.
Page 4: Use Of Furnace As A Construction Heater
This furnace must be installed so that its electrical Use of Furnace as a Construction Heater components are protected from water. Comfort-Aire / Century does not recommended the use of Installed in Combination with a Cooling Coil these units as a construction heater during any phase of When this furnace is used with cooling units, it shall be construction.
Page 5: General
General Combustion, Dilution & Ventilation Air In the past, there was no problem in bringing in sufficient These instructions are intended as a general guide and do outdoor air for combustion. Infiltration provided all the air that not supersede local codes in any way. Consult authorities was needed.
Page 6 All gas fired appliances require air for the combustion Equipment in Confined Space - All Air From Inside process. If sufficient combustion air is not available, the furnace or other appliances will operate inefficiently and unsafely. Enough air must be provided to meet the needs of all fuel burning appliances and appliances such as exhaust fans which force air out of the house.
Page 7 When ducts are used, they shall be of the same cross EQUIPMENT IN CONFINED SPACE sectional area as the free area of the openings to which (ALL AIR FROM OUTSIDE) they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered.
Page 8: Setting Equipment
Setting Equipment Upflow Applications Allow for clearances to combustible materials as indicated WARNING on the unit nameplate. Minimum clearances for closet or alcove installations are shown in Figure 8. Do not install the furnace on its front or its back. Do not connect the return air ducts to the back of the furnace.
Page 9 Return Air - Upflow Applications Return air can be brought in through the bottom or either Single Side Return Air side of the furnace installed in an upflow application. If the (with transition and filter) 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 10 The furnace can be installed in horizontal applications. Remove the two screws that secure the bottom cap to the Order horizontal suspension kit (51W10) from Comfort-Aire furnace. Pivot the bottom cap down to release the bottom / Century, or use equivalent suspension method.
Page 11: Filters
Horizontal Application Unit installed on Platform Table 1 Duct System Use industry approved standards (such as those published by Air Conditioning Contractors of America or American Society of Heating, Refrigerating and Air Conditioning Engineers) to size and install the supply and return air duct system.
Page 12: Venting
Venting 1. Remove the four mounting screws (Figure 15) which A 4 inch diameter flue transition is factory installed on the secure the combustion air inducer / pressure switch combustion air inducer outlet of all models. Figure 16 shows assembly to the orifice plate. Lift the assembly and rotate the combustion air inducer as shipped from the factory.
Page 13 Horizontal Position HORIZONTAL LEFT POSITION HORIZONTAL RIGHT POSITION Top Vent discharge Top Vent Discharge • Disconnect pressure switch hose from barbed fitting on the pressure switch assembly. Remove pressure switch assembly (1 screw) and cut • Gas supply piping must be brought into the unit from the bottom in order wire tie to free pressure switch wires.
Page 14 These series units are classified as fan assisted Category Use self drilling sheet metal screws or a mechanical fastener I furnaces when vertically vented according to the latest to firmly secure the vent pipe to the round collar of the flue edition of National Fuel Gas Code (NFPA 54 / ANSI Z223.1) transition.
Page 15 Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector 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. Figure 25 DO NOT insulate the space between the liner and the Do not install a manual damper, barometric draft regulator, chimney wall with puffed mica or any other loose granular...
Page 16 6. The entire length of single wall metal vent connector 13. When the vent connector used for Category I appliances shall be readily accessible for inspection, cleaning, and must be located in or pass through a crawl space, attic or replacement.
Page 17 Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category I Appliance NOTE: Single appliance venting configureations with zero lateral lengths are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90 °...
Page 18 Vent Connector Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Table 4 Common Vent Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Table 5 Page 18 of 32 Issue 1623...
Page 19: Gas Piping
Removal of the Furnace from Common Vent Gas Piping In the event that an existing furnace is removed from a venting system commonly run with separate gas appliances, CAUTION the venting system is likely to be too large to properly vent the remaining attached appliances.
Page 20 Gas Pipe Capacity - ft³/hr (m³/hr) Note: Capacity given in cubic feet (m³) of gas per hour and based on 06.0 specific gravity gas. Table 6 NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET Figure 26 Horizontal Applications Possible Gas Piping Configurations NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET Figure 27 Page 20 of 32...
Page 21: Electrical
Leak Check The unit is equipped with a field make-up box on the left After gas piping is completed, carefully check all piping hand side of the cabinet. The make-up box may be moved connections (factory and field installed) for gas leaks. Use to the right side of the furnace to facilitate installation.
Page 22 Before connecting the thermostat, check to make sure the Thermostat wires will be long enough for servicing at a later date. Make Install the room thermostat according to the instructions sure that thermostat wire is long enough to facilitate future provided with the thermostat.
Page 23 Wiring Diagram Figure 32 507713-01 Issue 1623 Page 23 of 32...
Page 24 Integrated Control (Automatic Hot Surface Ignition System) Figure 34 Integrated Control Diagnostic Codes NOTE: This control is equipped with a push button switch for diagnostic code recall. The control stores the last 5 fault FAILURE CODES codes in non-volatile memorty. The most recent fault code is flashed first, the oldest fault code is flashed last.
Page 25: Unit Start-Up
Unit Start-Up 6. Move switch on gas valve to OFF. Do not force. See Figure 35. FOR YOUR SAFETY READ BEFORE LIGHTING UNIT. 7. Wait five minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor’s phone.
Page 26: Heating Sequence Of Operation
Heating Sequence Of Operation NOTE: To obtain accurate reading, shut off all other gas appliances connected to meter. See figure 36. 1. When thermostat calls for heat, combustion air blower Supply Pressure Measurement starts. A threaded plug on the inlet side of the gas valve provides 2.
Page 27: High Altitude
High Altitude This furnace is carefully designed for optimal performance under a wide range of operating conditions. To ensure proper operation at higher altitudes, certain adjustments and/or kits may be required. Manifold Pressure – Between 2000 and 7500 ft, certain units require manifold pressure adjustments specified in Table 9. Manifold pressure should be measured, and adjusted as required during unit start up.
Page 28: Other Unit Adjustments
Fan Control Blower Speeds The fan on time of 45 seconds is not adjustable. The heat Follow the steps below to change the blower speeds. fan off delay (amount of time that the blower operates after 1. Turn off electrical power to furnace. the heat demand has been satisfied) may be adjusted by 2.
Page 29: Service
Service Filters Filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when WARNING necessary to ensure that the furnace operates properly. Replacement filters must be rated for high velocity airflow. ELECTRICAL SHOCK, FIRE, Table 1 lists recommended filter sizes.
Page 30: Repair Parts List
The following repair parts are available through independent attachment over the face of burners. Visually inspect Comfort-Aire / Century dealers. When ordering parts, include inside the burners and crossovers for any blockage the complete furnace model number listed on the CSA caused by foreign matter.
Page 31 Blower Performance Data Motor CFM @ External Static Pressure - “ w.c. Blower Temp Blower Model Size Size Rise (°F) Speed 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 (hp) High 1571 1527 1472 1399 1329 1223 1137 1020 Med/High 1332 1314 1277...
Page 32 REQUIREMENTS for COMMONWEALTH of MASSACHUSETTS 4. INSPECTION. The state or local gas inspector of the Modifications to NFPA-54, Chapter 10 - side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following shall not approve the installation unless, upon requirements: inspection, the inspector observes carbon monoxide For all side wall, horizontally vented, gas fueled equipment...

COMFORT-AIRE GUH80A Installation Instructions Manual

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