Goodman Mfg GAS-FIRED WARM AIR FURNACE XV. Normal Sequence of Operation, Power UP, Heating Mode

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CIRCULATOR BLOWER FAN TIMING ADJUSTMENT

NOTE: Items in this section refer to the air circulator blower fan NOT to the induced draft blower. The induced draft blower timing sequence is not adjustable. The circulator blower fan timing is adjustable only on models with optional “heating fan OFF delay” adjustment pins or switches. It is NOT adjustable in any other circumstances.

As shipped, the circulator blower fan will remain on for 150 seconds after the gas valve closes. When a call for cooling occurs, the circu- lator fan comes on and remains on for 45 seconds after the call for cooling ends. During normal heating operation, the circulator fan will come on approximately 34 seconds after the gas valve opens.

SECOND

 

 

SECOND

 

 

 

 

DELAY

 

 

DELAY

 

 

 

 

Switch viewed in an upflow installation.

Adjustment Switch

SETTING FURNACE OPERATING MODE

This furnace is designed to operate with either a single gas input rate or with two distinct gas input rates. The Mode DIP switch is used to select the single gas input rate or two distinct input rates.

Setting the Mode switch to “1 STG” forces the furnace to operate at the furnace’s highest input rate only. Operation is as described under Sequence of Operation (Integrated Ignition Control) – Mode DIP Switch is set to “1 STG” position.

Setting the Mode switch to “2 STG” allows the furnace to operate at the furnace’s highest input AND at an input rate that is 75% of the highest input rate. For this mode of operation, the furnace oper- ates at the low input rate for a pre-determined time period then steps to the high input rate. Operation is as described under Se- quence of Operation (Integrated Ignition Control) – Mode DIP Switch is set to “2 STG” position.

The time period is determined by the 2nd Stg Dly DIP switch. Setting the 2nd Stg Dly DIP switch to 5 minutes fixes the delay period at 5 minutes. Setting the 2nd Stg Dly DIP switch to Auto enables an algorithm that calculates a delay period based on the heating cycle time and the total cycle time. The delay period can range from 1 minute to 12 minutes.

NOTE: The ACSH, AMH, AMEH, GCH, GDH, GMH and GME hybrid furnaces require a single stage thermostat. These furnaces utilize a control board with single stage or two stage capability. The second stage feature is established by setting dip switch #2 on the board, either one stage or two stage. All of the second stage timing is then controlled by dipswitch 3 on the circuit board.

 

100

1

 

 

 

 

150

HEAT OFF SECOND

 

 

 

 

ON

SECOND

DELAY

DELAY

 

 

 

 

DELAY

 

 

 

 

 

MODE

2-STAGE

2

 

 

 

 

1-STAGE

 

 

 

 

 

 

FOF

 

ON

 

 

 

 

 

 

SECOND

5

3

 

 

 

 

 

 

 

 

 

 

STAGE

MINUTES

 

 

OFF

 

ON

AUTO

ONLY

 

 

 

 

 

 

 

 

 

 

 

 

XV. NORMAL SEQUENCE OF OPERATION

POWER UP

The normal power up sequence is as follows:

115 VAC power applied to furnace.

Integrated control module performs internal checks.

Integrated control module LED will light.

Integrated control module monitors safety circuits continuously.

Furnace awaits call from thermostat.

HEATING MODE

(MODE DIP SWITCH IS SET TO “1 STG” POSITION)

The normal operational sequence in heating mode is as follows:

R and W thermostat contacts close, initiating a call for heat.

Integrated control module performs safety circuit checks.

Induced draft blower is energized for 15 second pre-purge period causing pressure switch contacts to close.

Igniter warm up begins after 15 second prepurge expires.

Low and high stage gas valves open at end of igniter warm up period, delivering gas to burners and establishing flame.

Integrated control module monitors flame presence. Gas valve will remain open only if flame is detected.

Circulator blower is energized on high heat speed following a fixed thirty second blower on delay. Electronic air cleaner terminals are energized with circulator blower.

Furnace operates; integrated control module monitors safety circuits continuously.

R and W thermostat contacts open, completing the call for heat.

Gas valve closes, extinguishing flame.

Induced draft blower is de-energized following a fifteen second post purge.

The circulator blower remains at high heat speed for thirty seconds. The circulator blower then switches to low heat speed for the remainder of the selected heat off delay period. For example, the selected heat off delay period is 150 seconds. The circulator blower operates at high heat for 30 seconds and at low speed for 150 - 30 = 120 seconds.

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Contents GCH95/GME95/GCH9 Table of Contents XVII. Safety Circuit Description XIV. Startup Procedure & AdjustmentXVIII. Troubleshooting XIX. MaintenanceCarbon Monoxide Poisoning Hazard Component Identification Upflow/HorizontalWhat to do if YOU Smell GAS II. Safety ConsiderationsIII. Product Application Electrostatic Discharge ESD PrecautionsGeneral IV. Location Requirements & ConsiderationsSuspended Furnace Clearances and AccessibilityFurnace Suspension Existing Furnace RemovalCombustion & Ventilation AIR Requirements Thermostat InfluencesThermostat Location See 5.3.3-a VII. Horizontal Applications & Considerations VI. Installation PositionsHorizontal Furnace VIII. Propane GAS /HIGH Altitude Installations Recommended Installation PositionsAlternate Electrical and GAS Line Connections Drain PANDirect Vent Terminal Clearances Dual Certification NON-DIRECT/DIRECT Vent IX. VENT/FLUE Pipe & Combustion AIR PipeMaterials and Joining Methods Proper VENT/FLUE and Combustion AIR Piping PracticesTermination Locations Increased Clearance ConfigurationCanadian Venting Requirements Standard Furnace ConnectionsAlternate Furnace Connections Vent/Flue Pipe CutsNON-DIRECT Vent Single Pipe Piping Alternate Vent/Flue LocationDirect Vent Dual Pipe Piping Termination of Multiple Direct Vent Furnaces Alternate Horizontal Vent Termination Dual PipeCondensate Drain Lines & Drain Trap Concentric Vent TerminationStandard Right or Left Side Drain Hose Connections Hose and Tube IdentificationAlternate VENT/FLUE Drain Hose Connections Drain TrapUpright Standard Connections Left Side Upright INSTALLATIONS-TRAP on Left SideUpright Drain Trap Mounting Left or Right Side Panel Horizontal Installations Right Side DownHorizontal Drain Trap Mounting Left or Right Side Panel Left Side DownXI. Electrical Connections Wiring HarnessJunction Box Relocation Junction BOX RelocationField Wiring for GME95 /AMEH96 Furnacewith 2-Stage Thermostat DiagramVolt Thermostat Wiring GME95/AMEH96 Furnace with 2-STAGE Condenser Field WiringVolt Humidifier Nals XII. GAS Supply and PipingGAS Piping Connections Rack, manifold or gas valve Gas Piping Connections Horizontal Upflow ModelPropane Gas Piping Chart Propane Gas Installation TypXIII. Circulating AIR & Filters Propane GAS Tanks and PipingDuct Flange Cut Outs Checking Static Pressure 80% Furnace Shown, 90% SimilarChecking Duct Static Bottom Return AIR Opening Upflow ModelsPermanent Minimum Filter Area sq. XIV. Startup Procedure & AdjustmentDisposable Minimum Filter area sq. Filter LocationsWhite-Rodgers Model 36G54 Two-Stage White-Rodgers Model 36G54 Connected to ManometerHoneywell Model VR9205 Connected to Manometer GAS Supply Pressure MeasurementMeasuring Inlet Gas Pressure Alt. Method GAS Manifold Pressure Measurement and AdjustmentGAS Input Rate Measurement Natural GAS only Temperature Rise Temperature Rise MeasurementCirculator Blower Speeds Setting Furnace Operating Mode Circulator Blower FAN Timing AdjustmentPower UP Heating ModePage XVIII. Troubleshooting XIX. Maintenance XXI. Repair & Replacement Parts XX. Before Leaving AN InstallationNo signal Troubleshooting ChartContinuously Blower Performance Data MH95ACSH96 AMEH96 GCH95 / GCH9115 GME95 MH950453,0704,0905D MH950703,0904,1155 Wiring DiagramMH950905CX GME95 / AMEH96 Exemptions GAS Vent Directly BELOW. Keep Clear of ALL ObstructionsThis page Left Intentionally Blank This page Left Intentionally Blank This page Left Intentionally Blank Quality Makes the Difference