Greenheck Fan 470656 manual Sequence of Operation Electronic Modulation

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Sequence of Operation

4:1 Electronic Modulation, continued

4. Ignition Controller (IC1) Sequence of Operation

•The N.O. contact on air proving switch (PS2) is open

•The ignition controller (IC1) energizes the induction relay (IR)

•N.O. contact on induction relay (IR) closes

•Power passes to and energizes the combustion blower (CM), sending it to high speed

•The N.O. contact on air proving switch (PS2) and high pressure switch (PS5) closes

•The ignition controller (IC1) begins a 15 second pre-purge

•The main gas valve (MV) fully opens (100%) and the modulating gas valve (MOD) opens to high fire

•Igniter begins sparking

•10 second trial for ignition begins

•The furnace will light at high fire (100%)

•When the flame is detected, the igniter stops sparking

•The furnace will remain at high fire (100%) for 30 seconds

•The modulation controller (SC1) will adjust the modulating gas valve (MOD) and the combustion blower (CM) as needed between low and high fire

•The modulating controller (SC1) will monitor the high pressure switch (PS5) and run the furnace at low fire if the high pressure switch is not satisfied

5. High Fire – Low Fire Sequence of Operation

•The furnace lights at and remains at high fire

(100%) for 30 seconds

•If the discharge temperature sensor (TS2) reading is above the discharge temperature setting (dtS, FX Program Menu), and the furnace is not at low fire, the modulating controller (SC1) will adjust the modulating gas valve (MOD) down until the discharge temperature sensor (TS2) reading equals the discharge temperature setting (dtS, FX Program Menu)

•If the discharge temperature sensor (TS2) reading is below the discharge temperature setting (dtS, FX Program Menu), and the furnace is not at high fire, the modulating controller (SC1) will adjust the modulating gas valve (MOD) up until the discharge temperature sensor (TS2) reading equals the discharge temperature setting (dtS, FX Program Menu)

6.Optional Evaporative Cooling Contact (S4) Closed*

•N.O. contact on fan relay (RF) is energized and closed

•Power passes through N.O. contact on inlet air sensor (TS4), which is energized and closed if the inlet air temperature is above the set point

•Power passes to and energizes cool relay (RC)

•N.O. contact on cool relay (RC) is energized and closed

•Power passes to evaporative cooling pump (P1)

*If DX or chilled water coils are used rather than an evaporative cooler, the cooling sequence of operation will depend on the coil controls. Cooling coil controls are supplied by others.

42 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 Exhaust Fan Install Exhaust OptionsInstall Supply Unit Installation of Evaporative Cooling Module optional Installation of Venting for Outdoor UnitsStandard Indoor Venting Installation of Venting for Indoor UnitsVenting Methods Separated Combustion Concentric VentingInstallation of Standard Indoor Venting Installing Exhaust Vent PipeVent Pipe Diameter 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 ModulationExit High Fire Mode Start-Up 41 Electronic ModulationCheck the Low Fire Manifold Pressures 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 External Signal a variable Check Operation VAV Units optionalBuilding Pressure Control 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 CoolerAdjust the Manual Supply Valve Adjust the On Time FactorWater Wizard Improper Water Supply 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
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