Allied Air Enterprises A80UH, 80G1UH Cleaning the Heat Exchanger and Burners, Page 34 of, Issue

Page 34

Cleaning the Heat Exchanger and Burners

Cleaning the Heat Exchanger and Burners

NOTE: Use papers or protective covering in front of the furnace during cleaning.

1.Turn off both electrical and gas power supplies to furnace.

2.Remove flue pipe and top cap (some applications top cap can remain) from the unit.

3.Label the wires from gas valve, rollout switches, primary limit switch and make-up box then disconnect them.

4.Remove the screws that secure the combustion air inducer/pressure switch assembly to the collector box. Carefully remove the combustion air inducer to avoid damaging blower gasket. If gasket is damaged, it must be replaced to prevent leakage.

5.Remove the collector box located behind the combustion air inducer. Be careful with the collector box gasket. If the gasket is damaged, it must be replaced to prevent leakage.

6.Disconnect gas supply piping. Remove the screw securing the burner box cover and remove cover. Remove the four screws securing the burner manifold assembly to the vestibule panel and remove the assembly from the unit.

7.Remove screws securing burner box and remove burner box.

8.NOX units only - Remove screw securing NOX insert. Remove NOX insert. See Figure 39.

BURNER, COMBUSTION AIR INDUCER ASSEMBLY & HEAT EXCHANGER REMOVAL

Figure 38

Page 34 of 39

Issue 1031

506526-01

Image 34

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