Greenheck Fan Guide to Operating Temperature & Flame Signal Check for Greenheck Differential Pressure Units

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6. Set the Unit’s Operating Temperature

Set the operating temperature. The operating temperature setting depends on which Maxitrol controller is used.

Maxitrol Series 14

The Maxitrol Series 14 should be set to the desired discharge temperature. The temperature selector is built into the amplifier.

Set the discharge temperature

Typical: 65ºF

Series 14 Discharge Temperature Setting

7. Flame Signal Check

To measure the flame signal connect a standard DC voltmeter to the flame amplifier test jacks + and - (com) as shown to

the right. The flame signal should be above 1.25 VDC and steady.

Check the flame signal with the burner at pilot only, minimum fire, mid fire and high fire.

DC Voltmeter and

Flame Amplifier

Important

If the flame signal is not above 1.25 VDC and steady, consult the troubleshooting section.

12Model VSU Make-Up Air

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Contents General Safety Information Model VSUInspection and Maintenance during Storage ReceivingUnpacking HandlingTable of Contents InstallationInstall Ductwork Complete InstallationBurner/Blower Section Dimensional Data Upblast DischargeInstallation of Direct Gas Piping Install Additional Regulator if RequiredDetermine the Supply Gas Requirements Connect the Supply Gas LinePipe the Optional Vent Line Test the System for LeaksStart-Up Blower Air Volume Measurement & Check Set-up Optional ComponentsStart-Up Direct Gas Check the Supply Gas PressureSet the Burner Air Pressure Differential Check the Pilot Gas PressureSet the Maximum Firing Rate Regulators and Modulating ValvesSet the Minimum Firing Rate Maxitrol Series 14 7 terminalsSet the Unit’s Operating Temperature Flame Signal CheckMaxitrol Series Operation Electrical Troubleshooting Blower Does Not OperateTerminals R and X? Terminals G and X?Heater Does Not Operate Does not attempt to light No visible sparkAttempts to light, but no pilot visible spark Visible pilot Maintenance Routine Belt DrivesMotors WheelsMaintenance Fall BearingsStart-Up High LimitReference Typical Control Center LayoutTypical Gas Train Layout Start-Up Checklist Maintenance Log Date Time AM/PMMaintenance Log Warranty

VSU specifications

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