Greenheck Fan 470656 manual Sequence of Operation Staged Sequence

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Sequence of Operation

2:1 Staged 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. fan relay (RF), which is energized and closed if the supply fan (M1) is on

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

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

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

•24 VAC is supplied to stage controller (SC1)

•If the discharge temperature is less than the set point on the discharge air sensor (TS2) and the high temperature limit control (HLC1) has not been tripped, the N.O. contact for furnace stage controller will close

•Power will be supplied to the ignition controller

(IC1), which will begin its sequence of operation

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%)

•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 stages to maintain the discharge air temperature set point (SC1)

5. High Fire – Low Fire Sequence of Operation

•The furnace lights at high fire (100%) and remains at high fire for 10 seconds

•If the discharge temperature is above the discharge air sensor (TS2) set point, the N.O. furnace stage 2 controller contact (SC2), will open and the furnace will go to low fire (50%)

•If the furnace is at low fire (50%) and the discharge temperature is above the discharge air sensor (TS2) set point, the furnace stage 1 contact (SC1) will open and the furnace will shut down

•If the furnace is at low fire (50%) and the discharge temperature is below the discharge air sensor (TS2) set point, the furnace stage 2 contact (SC2) will close and the furnace will go to high fire

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)

•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.

38 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
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