Allied Air Enterprises A80UH Return Air - Upflow Applications, Bottom and one side return air

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Return Air - Upflow Applications

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. The furnace is equipped with a removable bottom panel to facilitate installation.

Markings are provided on both sides of the furnace cabinet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on page 2.

NOTE: 20C and 20D units that require air volumes over

1800 cfm (850 L/s) 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) cleanable air filter. (Required to maintain proper air velocity.) See Figure 9.

2.Single side return air with optional return airbase. See Figure 10.

3.Bottom return air.

4.Return air from both sides.

5.Bottom and one side return air.

Single Side Return Air

(with transition and filter)

Figure 9

Optional Return Air Base

(Upflow Applications Only - For use with A, B, C and D cabinets))

FRONT VIEW

NOTE: Optional Side Return Air Filter Kits are not for use with Return Air Base.

1 Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.

Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm). The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.

Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air opening. The size of the opening must not extend beyond the markings on the furnace cabinet.

² To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.

Figure 10

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Issue 1031

506526-01

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Contents A80UH & 80G1UH TABLE OF CONTENTSINSTALLATION INSTRUCTIONS Warm Air Gas FurnaceFRONT VIEW A80UH & 80G1UH Unit Dimensions - inches mmSIDE VIEW A80UH & 80G1UH 506526-01DANGER Safety InformationInstalled Locations A80UH & 80G1UH Gas FurnaceTemperature Rise Installed in Combination with a Cooling CoilHeating Unit Installed Upstream of Cooling Unit Use of Furnace as a Construction HeaterAllied Air Enterprises, Inc GeneralProduct Contains Fiberglass Wool 215 Metropolitan Drive West Columbia, SCEquipment in Confined Space - All Air From Inside Unconfined SpaceConfined Space Figure Air from InsideEQUIPMENT IN CONFINED SPACE Upflow Application Installation Clearances Setting EquipmentUpflow Applications 3.Bottom return air 4.Return air from both sides Return Air - Upflow Applications1800 cfm 850 L/s must have one of the following 5.Bottom and one side return airRemoving the Bottom Panel Figure Horizontal Application Installatioin clearancesRemoving the Bottom Panel Horizontal ApplicationsTable Duct System Horizontal Application Unit installed on PlatformFilters Supply Air PlenumUPFLOW POSITION VentingMounting Screws Location Figure UPFLOW POSITION Figure UPFLOW POSITIONFigure HORIZONTAL LEFT POSITION Horizontal PositionHORIZONTAL LEFT POSITION HORIZONTAL RIGHT POSITIONVent Connection Figure Venting Using a Masonry ChimneyCommon Venting Using Metal Lined Masonry Chimney IssueGeneral Venting Requirements Issue Page 17 ofPage 18 of Serving a Single Category I ApplianceIssue 506526-01Page 19 of Serving a Single Category I ApplianceIssue 506526-01Common Vent Capacity Vent Connector CapacityServing Two or More Category I Appliances Serving Two or More Category I AppliancesVent Connector Capacity Table Common Vent CapacityServing Two or more Category I Appliances Table Serving Two or More Category I AppliancesIssue Removal of the Furnace from Common VentCARBON MONOXIDE POISONING HAZARD Page 22 ofGas Pipe Capacity - ft³/hr m³/hr Gas PipingGas Supply IssueIssue Possible Gas Piping ConfigurationsFigure Horizontal Applications Page 24 ofFigure Electrical ELECTROSTATIC DISCHARGE ESD INTERIOR MAKE-UPBOX INSTALLATION FigureLeak Check INTERIOR MAKE-UPBOX INSTALLATION FigureThermostat Accessory TerminalsGenerator Use - Voltage Requirements Condensing Unit Thermostat DesignationsPage 27 of Wiring Diagram FigureIssue 506526-01Integrated Control Typical Field Wiring Diagram FigureAutomatic Hot Surface Ignition System Placing the Furnace into Operation FOR YOUR SAFETY READ BEFORE LIGHTING UNITUnit Start-UP Gas Valve Operation FigureSupply Pressure Measurement Gas Pressure Adjustment Gas Flow ApproximateHeating Sequence Of Operation Figure Manifold Pressure MeasurementFlame Rollout Switches Manifold Pressure Settings and Pressure SwitchOther Unit Adjustments Pressure SwitchBlower Speeds Thermostat Heat AnticipationElectrical Electronic IgnitionBlower ServiceELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Flue And ChimneyPage 34 of Cleaning the Heat Exchanger and BurnersIssue 506526-01Remove 5 Screws If Necessary NOx INSERTS FigureIssue PLANNED SERVICEFAILURE CODES Page 36 ofHeating Parts REPAIR PARTS LISTCabinet Parts Control PanelPage 38 of START-UP& PERFORMANCE CHECK LIST UNIT SET UPIssue 506526-01Page 39 of IssueUNIT OPERATION 506526-01