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Field Controls Flue Damper / Wired into Beckett heat manager Fuel Economizer

heathead Member Posts: 234
OK have flue damper that I am going to replace because it struggles to open fully and close the switch to let the boiler fire. I was thinking the bypass switch on side just kept it open on the field controls model CVD . When I flip the switch the boiler won't fire or any lights on the Beckett heat manager. i returned the switch back and just moved the damper open. What is the bypass switch for. IE can't find wiring diagram for what that bypass on the field controls is actually doing. Or is something wired wrong between the Beckett heat manager and the field controls safety switch. It works like it should unless the bypass switch is flipped. Thanks


  • Steamhead
    Steamhead Member Posts: 16,710
    It's supposed to lock the damper in the open position.

    You don't need to replace the entire damper. Field sells just the motor, part #GVD-RMA.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • heathead
    heathead Member Posts: 234
    Steamhead thank you. I have ordered the replacement motor (with the circuit board). I can't figure out why the becket heat manager gets no power when bypass switch is flipped to bypass. I will see if it changes with new motor / board tomorrow. Is the by pass switch just used to kill the closed function on the damper . IE no current to close damper. That is what I thought but can't find better information on wiring of the switch because its part of field controls logic.
  • Jamie Hall
    Jamie Hall Member Posts: 22,877
    Bypass switch or no, if the damper fails to open fully for whatever reason, the limit switch (which I think is in the motor) won't close and the boiler won't fire.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England