Greenheck Fan 470656 manual Single or 21 Stage Furnace Will Not Light, Improper manifold pressure

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Troubleshooting

Single or 2:1 Stage Furnace Will Not Light

24 VAC across R and X?

Yes

24 VAC across W1 and X?

Yes

24 VAC across 22 and 21?

Yes

24 VAC across 24 VAC and

21 on SC1 controller?

Yes

24 VAC across A and 21?

Yes

High limit (HLC1) open?

No

Ignition controller (IC#) red LED

blinks 7 times or is on

No

Ignition controller (IC#) red LED

blinks 6 times

No

Ignition controller (IC#) red LED blinks

1 time, 2 times or 4 times

Yes

Everything is working

properly, consult factory.

No

No

No

No

No

Yes

Yes

Yes

Yes

Main disconnect (DS1) open or defective

Close, repair or replace

Main transformer (TR1) fault

Replace main transformer

Heat Switch (S4) open

(Turn Heat Switch (S4) on)

Heating Transformer (TR2) Fault

Replace heating transformer

Optional inlet air sensor (TS4) open

Adjust setting. Reference Blower Start-Up, Step #6

Heat relay (RH) is not energized

Check for loose connections. Repair or replace heat relay (RH)

Discharge air selector (TS2) improperly set or faulty

Adjust setting (see Staged Start-Up) or replace sensor

Furnace stage one contact (SC1) defective (stage only)

Replace furnace stage one contact

Discharge temperature was above high limit setting.

Wait for high limit to cool and reset.

Ignition controller (IC1) failed.

(Replace ignition controller)

Combustion blower (CM) not functioning

Replace combustion blower or relay (CR)

Air proving switch (PS2) defective.

Replace air proving switch

Improper manifold pressure

Set high and low manifold pressure (refer to Single Stage or

2:1 Staged Control Start-Up section)

Faulty spark rod or spark gap does not equal 1/8 inch

Replace spark rod or adjust gap to 1⁄8 inch

50 Model IG / IGX Make-Up Air

®

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Contents Installation, Operation and Maintenance Manual General Safety InformationHandling Inspection and Maintenance during StorageReceiving StorageTable of Contents Clearance to Combustibles / Service ClearancesInstallation of Indoor Unit Installation of Arrangement DB / HZInstall Curb/Equipment Supports Installation of Roof Mounted Unit Arrangement DBCInstall Combination Curb Adaptor Assemble and Attach WeatherhoodInstall Supply Unit Install Exhaust FanInstall Exhaust Options Installation of Evaporative Cooling Module optional Installation of Venting for Outdoor UnitsStandard Indoor Venting Installation of Venting for Indoor UnitsVenting Methods Separated Combustion Concentric VentingVent Pipe Diameter Installation of Standard Indoor VentingInstalling Exhaust Vent Pipe Installation of Concentric Venting General Concentric Venting HorizontalConcentric Venting Vertical Intake END Installation of Two Pipe Venting Horizontal Seal Wall OpeningsInstallation of Two Pipe Venting Vertical Seal Roof PenetrationInstallation Electrical Wiring Install Discharge Air Sensor optional Wire the Evaporative Cooler optionalInstall Economizer Sensors optional Install DDC Interface OptionalDetermine the Supply Gas Requirements Installation of Gas PipingInstall Additional Regulator if Required Connect the Supply Gas LineInstall the Drain Line Installation Evaporative Cooler Piping optionalInstall the Water Supply Line Check/Adjust Water LevelInstall Normally Open Drain Line/ Solenoid Installation of Water WizardTM optionalInstall Normally Closed Supply Line/ Solenoid Water Wizard Valves When provided by manufacturerWire the Solenoids Installation of Water WizardInstallation Direct Expansion DX Coil Piping optional Wire the Temperature SensorCheck Coil Piping for Leaks Install Suction LineMount the Remote Sensing Bulb By Others Evacuate and Charge the CoilInstallation of Chilled Water Coil Piping optional Installation of Building Pressure Control optionalStart-Up Blower Set-up Optional Components Start-Up Single Stage Control Reset the Temperature SettingStart-Up Furnaces all units Send Unit to High FireSend Unit to Low Fire Start-Up 21 Staged ControlStart-Up 81 Staged Control Check the Low Fire Manifold PressureEdit the Setting Access the Setpoints MenuAccess the Discharge Air Temperature Setting Access the Inlet Air Sensor SettingAccess the Room Override Setting High Fire Adjustment Start-Up 21 Electronic ModulationCheck the Low Fire Manifold Pressures Exit High Fire ModeStart-Up 41 Electronic Modulation Access the Setpoints Menu Set Minimum Outside Air Verify Sensor InstallationStart-Up Economizer optional Set the Enthalpy Changeover Set Point optionalStart-Up Evaporative Cooling optional Start-Up Water Wizard optional Operation - Water Wizard optional Building Pressure Control External Signal a variableCheck Operation VAV Units optional Building Pressure Control a Check Operation Recirculating Units optionalRecirculation Operation Damper actuator may take a fewSequence of Operation Staged Sequence Exhaust Fan Contact S1 Manually Closed optionalSequence of Operation 21 Modulation Sequence Sequence of Operation Modulation Sequence Discharge Air Temperature dtSOutside Air Temperature OAt Operation Modulation Staged ControllerOptional Room Override ROt Sequence of Operation 41 Electronic ModulationProgram Revision Number Light Off BlinkingSequence of Operation Electronic Modulation Sequence of Operation Staged Control Staging Control Sequence of OperationOperation and Errors Ignition Controller Following are the green LED codes of operationOperation Economizer Option EC-1 Outside Air Temperature ReferenceOption EC-3 Differential Temperature Control Option EC-2 Outside Air Enthalpy ReferenceTroubleshooting Blower Does Not OperateMotor Over Amps Insufficient Airflow Too Much AirflowExcessive Noise or Vibration Single or 21 Stage Furnace Will Not Light Improper manifold pressureModulating Furnace Will Not Light Heat transformer TR2 fault Ignition controllers IC# failed Staged Furnace Will Not Light Internal high limit tripped temperature above set point Evaporative Cooler does not Operate Recirculating pump Water Blows through Evaporative CoolerWater Wizard Improper Water Supply Adjust the Manual Supply ValveAdjust the On Time Factor Snow Accumulation Maintenance RoutineBelt Drives WheelsChilled Water Coils MotorsFilters Evaporative CoolersMaintenance Fall Flushing Coils Reference Model IG Venting Connection Location Reference Model IGX Venting Connection LocationReference Model IG Single or 2 Stage Reference Model IG Staged Reference Model IG Modulation Modulating Reference Model IGX Blower Control Center Manifold Gas Pressure Test Port Staged Inch Gas Supply Manifold Gas Pressure Test Port Modulating Staged Reference Performance Table Performance TableReference Start-Up Checklist Start-Up ChecklistMaintenance Log Warranty