Greenheck Fan 470656 manual Ignition controllers IC# failed

Page 53

Troubleshooting

4:1 Modulating Furnace Will Not Light

...continued from previous page

High limit switch (HLC#) open?

No

Ignition controller (IC#)

red LED blinks

7 times or is on

No

Ignition controller (IC#) red LED blinks 6 times

No

24 VAC between terminals

1 and 2 on the Amplifier (AMP)

Yes

10 VDC between terminals

5 and 6 on the Amplifier (AMP)

Yes

24 VDC between terminals

3 and 4 on the Amplifier (AMP)

Yes

Ignition controller (IC#)

red LED blinks

1 time, 2 times or 4 times

No

Everything is working properly,

consult factory.

Yes

Yes

Yes

No

No

No

Yes

Discharge temperature was above high limit setting

Let cool, then reset high limit.

Ignition controller(s) (IC#) failed

Replace faulty ignition controller(s)

Pressure switch (PS2) failure

Repair or replace pressure switch (PS2)

Combustion blower (CM) not functioning

Replace fusing (FU7), combustion blower or relay (CM)

Secondary transformer (TR6) defective

Replace secondary transformer (TR6)

Furnace controller (SC1) defective

Replace furnace controller (SC1)

Amplifier (AMP) defective

Replace amplifier (AMP)

Improper manifold pressure

Set high and low manifold pressure

(refer to 4:1 Electronic Modulation 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

®

Model IG / IGX Make-Up Air 53

Image 53

Contents General Safety Information Installation, Operation and Maintenance ManualReceiving Inspection and Maintenance during StorageHandling StorageClearance to Combustibles / Service Clearances Table of ContentsInstallation of Arrangement DB / HZ Installation of Indoor UnitInstall Combination Curb Adaptor Installation of Roof Mounted Unit Arrangement DBCInstall Curb/Equipment Supports Assemble and Attach WeatherhoodInstall Supply Unit Install Exhaust FanInstall Exhaust Options Installation of Venting for Outdoor Units Installation of Evaporative Cooling Module optionalVenting Methods Installation of Venting for Indoor UnitsStandard Indoor Venting Separated Combustion Concentric VentingVent Pipe Diameter Installation of Standard Indoor VentingInstalling Exhaust Vent Pipe Concentric Venting Horizontal Installation of Concentric Venting GeneralConcentric Venting Vertical Intake END Seal Wall Openings Installation of Two Pipe Venting HorizontalSeal Roof Penetration Installation of Two Pipe Venting VerticalInstallation Electrical Wiring Install Economizer Sensors optional Wire the Evaporative Cooler optionalInstall Discharge Air Sensor optional Install DDC Interface OptionalInstall Additional Regulator if Required Installation of Gas PipingDetermine the Supply Gas Requirements Connect the Supply Gas LineInstall the Water Supply Line Installation Evaporative Cooler Piping optionalInstall the Drain Line Check/Adjust Water LevelInstall Normally Closed Supply Line/ Solenoid Installation of Water WizardTM optionalInstall Normally Open Drain Line/ Solenoid Water Wizard Valves When provided by manufacturerInstallation Direct Expansion DX Coil Piping optional Installation of Water WizardWire the Solenoids Wire the Temperature SensorMount the Remote Sensing Bulb By Others Install Suction LineCheck Coil Piping for Leaks Evacuate and Charge the CoilInstallation of Building Pressure Control optional Installation of Chilled Water Coil Piping optionalStart-Up Blower Set-up Optional Components Start-Up Furnaces all units Reset the Temperature SettingStart-Up Single Stage Control Send Unit to High FireStart-Up 81 Staged Control Start-Up 21 Staged ControlSend Unit to Low Fire Check the Low Fire Manifold PressureAccess the Discharge Air Temperature Setting Access the Setpoints MenuEdit the Setting Access the Inlet Air Sensor SettingAccess the Room Override Setting Start-Up 21 Electronic Modulation High Fire AdjustmentCheck the Low Fire Manifold Pressures Exit High Fire ModeStart-Up 41 Electronic Modulation Access the Setpoints Menu Start-Up Economizer optional Verify Sensor InstallationSet Minimum Outside Air 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 Recirculation Operation Check Operation Recirculating Units optionalBuilding Pressure Control a Damper actuator may take a fewExhaust Fan Contact S1 Manually Closed optional Sequence of Operation Staged SequenceSequence of Operation 21 Modulation Sequence Outside Air Temperature OAt Discharge Air Temperature dtSSequence of Operation Modulation Sequence Operation Modulation Staged ControllerProgram Revision Number Sequence of Operation 41 Electronic ModulationOptional Room Override ROt Light Off BlinkingSequence of Operation Electronic Modulation Staging Control Sequence of Operation Sequence of Operation Staged ControlFollowing are the green LED codes of operation Operation and Errors Ignition ControllerOption EC-3 Differential Temperature Control Option EC-1 Outside Air Temperature ReferenceOperation Economizer Option EC-2 Outside Air Enthalpy ReferenceBlower Does Not Operate TroubleshootingMotor Over Amps Too Much Airflow Insufficient AirflowExcessive Noise or Vibration Improper manifold pressure Single or 21 Stage Furnace Will Not LightModulating 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 Water Blows through Evaporative Cooler Evaporative Cooler does not Operate Recirculating pumpWater Wizard Improper Water Supply Adjust the Manual Supply ValveAdjust the On Time Factor Belt Drives Maintenance RoutineSnow Accumulation WheelsFilters MotorsChilled Water Coils Evaporative CoolersMaintenance Fall Flushing Coils Reference Model IGX Venting Connection Location Reference Model IG 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 Performance Table Reference Performance TableStart-Up Checklist Reference Start-Up ChecklistWarranty Maintenance Log