Allied Air Enterprises A80UH Heating Sequence Of Operation Figure, Supply Pressure Measurement

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Heating Sequence Of Operation (Figure 36)

Heating Sequence Of Operation (Figure 36)

1.When thermostat calls for heat, combustion air blower starts.

2.Combustion air pressure switch proves blower operation. Switch is factory set and requires no adjustment.

3.After a 15 second prepurge, the hot surface ignitor energizes.

4.After a 20 second ignitor warm-up period, the gas valve solenoid opens. A 4 second trial for ignition period begins.

5.Gas is ignited, flame sensor proves the flame, and the combustion process continues.

6.If flame is not detected after first ignition trial, the ignition control will repeat steps 3 and 4 four more times before locking out the gas valve. The ignition control will then automatically repeat steps 1 through 6 after 60 minutes.

7.To interrupt the 60 minute, move thermostat from “Heat” to “OFF” then back to “Heat.” Heating sequence then restarts at step 1.

Gas Pressure Adjustment

Gas Flow (Approximate)

Table 10

Furnace should operate at least 5 minutes before checking gas flow. Determine time in seconds for two revolutions of gas through the meter. (Two revolutions assures a more accurate time.) Divide by two and compare to time in Table 10 below. If manifold pressure matches Table 12 and rate is incorrect, check gas orifices for proper size and restriction. Remove temporary gas meter if installed.

NOTE: To obtain accurate reading, shut off all other gas appliances connected to meter.

Supply Pressure Measurement

A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap. Remove the threaded plug, install a field provided barbed fitting and connect a manometer to measure supply pressure. See Table 12 for proper line pressure. Replace the threaded plug after measurements have been taken.

Manifold Pressure Measurement

1.Remove the threaded plug from the outlet side of the gas valve and install a field provided barbed fitting. Connect to a manometer to measure manifold pressure.

2.Start unit and allow 5 minutes for unit to reach steady state.

3.While waiting for the unit to stabilize, observe the flame. Flame should be stable and should not lift from burner. Natural gas should burn blue.

4.After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in Table 12.

NOTE: Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.

Proper Combustion

Furnace should operate a minimum 15 minutes with correct manifold pressure and gas flow rate before checking combustion. Take combustion sample beyond the flue out let and compare to the tables below. The maximum carbon monoxide reading should not exceed 50 ppm.

Table 11

INTEGRATED IGNITION CONTROL

Blower on time will be 45 seconds after gas valve is energized. Blower off time will depend on “OFF TIME” Setting.

Figure 36

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Issue 1031

506526-01

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Contents A80UH & 80G1UH TABLE OF CONTENTSINSTALLATION INSTRUCTIONS Warm Air Gas FurnaceA80UH & 80G1UH Unit Dimensions - inches mm FRONT VIEWSIDE 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 Setting Equipment Upflow Application Installation ClearancesUpflow 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 506526-01Typical Field Wiring Diagram Figure Integrated ControlAutomatic 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
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