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Aquastat adjustment

Fizz Member Posts: 547
Steam boiler, with tankless coil domestic water heater. The aquastat is a White-Rogers, with no numerical temp settings. I removed housing cover which revealed wiring and a multi-toothed cogwheel. My question is how to adjust it, and how do you know what is proper setting? Assume you rotate left to reduce, and right to increase.


  • leonz
    leonz Member Posts: 1,126
    DO NOT ASSUME ANYTHING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    DO NOT TOUCH ANYTHING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    It is best for you to call a licensed steam certified and rated plumber and pay for an hours service call to check your boiler and the controls.

  • Fizz
    Fizz Member Posts: 547
    ok, thanks.
  • exqheat
    exqheat Member Posts: 185
    go to white rogers web site.
    John Cockerill Exquisite Heat www.exqheat.com Precisions boiler control from indoor reset.
  • Fizz
    Fizz Member Posts: 547
    Ok, thanks.
  • Grallert
    Grallert Member Posts: 644
    Are you sure there are no numbers? Stamped into that toothed wheel? That is there to be adjusted if needed. Be careful as sometime those controls are line voltage. You can adjust it while its powered safely if it's low voltage. turn it ckockwise until it calls or visa versa
    Miss Hall's School service mechanic, greenhouse manager,teacher and dog walker
  • Fizz
    Fizz Member Posts: 547
    That's good info, I will check. Thanks.
  • Fizz
    Fizz Member Posts: 547
    Grallert, you were right, numbers are stamped into wheel.