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INSTALLATION INSTRUCTIONS
A80UH & 80G1UH
Warm Air Gas Furnace
Upflow / Horizontal Left and Right Air Discharge
This manual must be left with the homeowner for future reference.
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.
WARNING
CAUTION
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
As with any mechanical e
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A80UH & 80G1UH Unit Dimensions - inches (mm) 1 NOTE - 20C and 20D 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. (508 x 635 x 25 mm) air filter. 2. Single side return air with optional RAB Return Air Base 3. Bottom return air. 4. Return air from both sides. 5. Bottom and one side return air. 2 Flue outlet may be horizontal bu
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A80UH & 80G1UH Expanded View Figure 1 506526-01 Issue 1031 Page 3 of 39
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A80UH & 80G1UH Gas Furnace The A80UH & 80G1UH gas furnace is shipped ready for CAUTION installation in the upflow or horizontal right position (for horizontal left position the combustion air pressure switch As with any mechanical equipment, personal injury can must be moved). The furnace is shipped with the bottom result from contact with sharp sheet metal edges. Be panel in place. The bottom panel must be removed if the careful when you handle this equipment. unit is to be installed in ho
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Temperature Rise This furnace may be installed in alcoves, closets, attics, basements, garages, and utility rooms in the upflow or NOTE: Furnace must be adjusted to obtain a temperature horizontal position. rise within the range specified on the unit nameplate. Failure to do so may cause erratic limit operation and may result in This furnace design has not been CSA certified for premature heat exchanger failure. installation in mobile homes, recreational vehicles, or outdoors. This furnace mus
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Combustion, Dilution & Ventilation Air General 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 not supersede local codes in any way. Consult authorities that was needed. In today’s homes, tight construction having jurisdiction before installation. practices make it necessary to bring in air from outside for combustion. Take into account that exhaust fans, applian
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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. When fireplaces, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is necessa
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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. If the design and free area of protective covering is not known for calculating the size opening required, it may be assumed that wood lo
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Setting Equipment Upflow Applications Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or WARNING 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. Doing so will adversely affect the operation of the safety Upflow Application Installation Clearances control devices, which could result in personal injury or death. The gas
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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. The furnace is equipped with a removable bottom panel to facilitate installation. Markings are provided on
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Removing the Bottom Panel Horizontal Applications The furnace can be installed in horizontal applications. Order Remove the two screws that secure the bottom cap to the horizontal suspension kit (51W10) from Allied Air, or use furnace. Pivot the bottom cap down to release the bottom equivalent suspension method. panel. Once the bottom panel has been removed, reinstall the bottom cap. See Figure 11. Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum cl
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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. This will result in a quiet and low static system that has uniform air distribution. Figure 14 NOTE: Do not operate the furnace in the heating mode with an external static pressure that exce
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Venting If necessary reposition the combustion air inducer, pressure A 4 inch diameter flue transition is factory installed on the switch and/or make-up box as needed per the following combustion air inducer outlet of all models. Figure 16 shows steps. See Figures 16 through 22. the combustion air inducer as shipped from the factory. 1. Remove the four mounting screws (Figure 15) which secure the combustion air inducer / pressure switch assembly to the orifice plate. Lift the assembly and rot
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Horizontal Position HORIZONTAL LEFT POSITION HORIZONTAL RIGHT POSITION Top Vent discharge Top Vent Discharge • Remove make-up box assembly (2 screws) and cut wire tie to free make- • Disconnect pressure switch hose from barbed fitting on the pressure up box wires. Reinstall make-up box on other side of cabinet. switch assembly. Remove pressure switch assembly (1 screw) and cut • Resecure make-up box wires: Either pull excess wires through the blower wire tie to free pressure switch wires. Re
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These series units are classified as fan assisted Category I Use self drilling sheet metal screws or a mechanical fastener furnaces when vertically vented according to the latest edition to firmly secure the vent pipe to the round collar of the flue of National Fuel Gas Code (NFPA 54 / ANSI Z223.1) in the transition. If self drilling screws are used to attach the vent USA. A fan assisted Category I furnace is an appliance pipe, it is recommended that three be used. Drive one self equipped wit
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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 or flue restrictor between the furnace and the chimney. insulati
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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 replacement. or other areas which may be cold, that portion of the 7. Single appliance venting configurations with zero lateral vent connector shall be constructed of listed doublewall lengths (Tables 3 and 4) are assumed to have no elbows type B vent material or materi
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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 ° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10
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Capacity of Type B Double Wall Vents with Single Wall Metal 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 ° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10
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Vent Connector Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Table 5 Common Vent Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Table 6 Page 20 of 39 Issue 1031 506526-01
