Greenheck Fan 470656 manual Sequence of Operation 21 Modulation Sequence

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Sequence of Operation 2:1 Modulation Sequence

1.Exhaust Fan Contact (S1) Manually Closed (optional)

•Power passes through N.C. contact on exhaust fan overload (ST2 OL), which is closed if exhaust fan (M2) has not overloaded

•Power passes to exhaust fan starter (ST2)

•N.O. contact on exhaust fan starter (ST2) is energized and closed

•Power passes to and energizes exhaust fan (M2)

2. Supply Fan Contact (S2) Manually Closed

•Power passes through N.C. field-supplied fire contact (FSC)

•Power passes through optional N.O. contact on exhaust fan starter (ST2), which is closed when the optional exhaust starter (ST2) is activated

•Power passes through N.C. contact on supply starter overload (ST1 OL), which is closed if the supply fan has not overloaded

•Power passes through N.C. contact on optional freeze protection timer (RT4), which is closed if the temperature has remained above the set point

•Power passes to and energizes optional inlet damper (D1), which opens

•Power passes through optional damper limit switch

(DL1), which is energized and closed if the optional inlet damper is open. It may take several minutes for the damper to fully open and for the damper limit switch to close

•Power passes to and energizes fan relay (RF)

•Power passes through N.O. contact on fan relay

(RF), which is closed once the fan relay (RF) is activated

•Power passes to and energizes starter relay (ST1)

•N.O. contact on supply fan starter (ST1) is energized and closed

•Supply fan (M1) starts

3. Heat Contact (S4) Manually Closed

•Power passes through N.O. contact on fan relay

(RF), which is energized and closed if the supply fan (M1) is on

•Power passes through the N.C. contact on optional inlet air sensor (TS4), which is closed if inlet air temperature is below set point

•Power passes to and energizes the heat relay (RH)

•Power passes to N.C. contact on high temperature limit control (HLC1), which remains closed if it has not been tripped

•N.O. contact on heat relay (RH) closes

•24 VAC is supplied to ignition controller (IC1) and amplifier (AMP)

•If the discharge air sensor (TS2) reading is less than the temperature selector (TS3) setting, the

amplifier (AMP) sends a call for heating to the ignition controller (IC1)

4. Ignition Controller (IC1) Sequence of Operation

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

•The ignition controller (IC1) energizes the combustion blower relay (CR)

•N.O. contact on combustion blower relay (CR) closes

•Power passes to and energizes the combustion blower (CM)

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

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

•The high fire relay (RT3) is energized and the N.O. contact on high fire relay (RT3) closes

•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 at least 10 seconds

•High fire contact (RT3) will open

•Furnace modulates to maintain the temperature selector (TS3) set point

5. High Fire – Low Fire Sequence of Operation

•The furnace lights at and remains at high fire

(100%) for 10 seconds

•If the discharge temperature sensor (TS2) reading is above the temperature selector (TS3) set point,

and furnace is not at low fire, the amplifier will adjust the modulating gas valve (MOD) down until the discharge temperature sensor (TS2) reading equals the temperature selector (TS3) setting

•If the discharge temperature sensor (TS2) reading is below the temperature selector (TS3) set point,

and the furnace is not at high fire, the amplifier will adjust the modulating gas valve (MOD) up until the discharge temperature sensor (TS2) reading equals the temperature selector (TS3) setting

•If the furnace is at low fire and the discharge temperature sensor (TS2) reading is above the temperature selector (TS3) set point, the amplifier will end the call for heat and the ignition controller (IC1) will shut down the furnace

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 optional 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)

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Model IG / IGX Make-Up Air 39

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Contents General Safety Information Installation, Operation and Maintenance ManualStorage Inspection and Maintenance during StorageReceiving HandlingClearance to Combustibles / Service Clearances Table of ContentsInstallation of Arrangement DB / HZ Installation of Indoor UnitAssemble and Attach Weatherhood Installation of Roof Mounted Unit Arrangement DBCInstall Combination Curb Adaptor Install Curb/Equipment SupportsInstall Exhaust Fan Install Exhaust OptionsInstall Supply Unit Installation of Venting for Outdoor Units Installation of Evaporative Cooling Module optionalSeparated Combustion Concentric Venting Installation of Venting for Indoor UnitsVenting Methods Standard Indoor VentingInstallation of Standard Indoor Venting Installing Exhaust Vent PipeVent Pipe Diameter 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 DDC Interface Optional Wire the Evaporative Cooler optionalInstall Economizer Sensors optional Install Discharge Air Sensor optionalConnect the Supply Gas Line Installation of Gas PipingInstall Additional Regulator if Required Determine the Supply Gas RequirementsCheck/Adjust Water Level Installation Evaporative Cooler Piping optionalInstall the Water Supply Line Install the Drain LineWater Wizard Valves When provided by manufacturer Installation of Water WizardTM optionalInstall Normally Closed Supply Line/ Solenoid Install Normally Open Drain Line/ SolenoidWire the Temperature Sensor Installation of Water WizardInstallation Direct Expansion DX Coil Piping optional Wire the SolenoidsEvacuate and Charge the Coil Install Suction LineMount the Remote Sensing Bulb By Others Check Coil Piping for LeaksInstallation of Building Pressure Control optional Installation of Chilled Water Coil Piping optionalStart-Up Blower Set-up Optional Components Send Unit to High Fire Reset the Temperature SettingStart-Up Furnaces all units Start-Up Single Stage ControlCheck the Low Fire Manifold Pressure Start-Up 21 Staged ControlStart-Up 81 Staged Control Send Unit to Low FireAccess the Inlet Air Sensor Setting Access the Setpoints MenuAccess the Discharge Air Temperature Setting Edit the SettingAccess the Room Override Setting Start-Up 21 Electronic Modulation High Fire AdjustmentExit High Fire Mode Start-Up 41 Electronic ModulationCheck the Low Fire Manifold Pressures Access the Setpoints Menu Set the Enthalpy Changeover Set Point optional Verify Sensor InstallationStart-Up Economizer optional Set Minimum Outside AirStart-Up Evaporative Cooling optional Start-Up Water Wizard optional Operation - Water Wizard optional External Signal a variable Check Operation VAV Units optionalBuilding Pressure Control Damper actuator may take a few Check Operation Recirculating Units optionalRecirculation Operation Building Pressure Control aExhaust Fan Contact S1 Manually Closed optional Sequence of Operation Staged SequenceSequence of Operation 21 Modulation Sequence Operation Modulation Staged Controller Discharge Air Temperature dtSOutside Air Temperature OAt Sequence of Operation Modulation SequenceLight Off Blinking Sequence of Operation 41 Electronic ModulationProgram Revision Number Optional Room Override ROtSequence 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-2 Outside Air Enthalpy Reference Option EC-1 Outside Air Temperature ReferenceOption EC-3 Differential Temperature Control Operation EconomizerBlower 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 pumpAdjust the Manual Supply Valve Adjust the On Time FactorWater Wizard Improper Water Supply Wheels Maintenance RoutineBelt Drives Snow AccumulationEvaporative Coolers MotorsFilters Chilled Water CoilsMaintenance 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
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