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mechanical v. electric probe type LWCO

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steamfitter
steamfitter Member Posts: 156
On HW boilers, is there a preference on which type of LWCO there is?
Is there as much need to blow down the Mech LWCO on a HW boiler as there is on a Steam boiler?

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,847
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    On hot water I think most would recommend a probe type control.

    No, hot water electronic probe controls need to be tested with the test switch which most have. The probe should be removed and cleaned 1 a year.
  • steamfitter
    steamfitter Member Posts: 156
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    Why are mechanical LWCO not as common in hw boilers?
    If they are used, would they have to be blown down as much as those on steam boilers?
  • JUGHNE
    JUGHNE Member Posts: 11,111
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    IMO they would be hard to test as you need the float to experience the water drop. So maybe never get blown down and tested.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,847
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    Usually when you blow down a hot water mechanical lwco the water come into the float chamber faster than you can drain it so you can't test the control. McDonnell Miller makes (Used to make??) test & checks which were piped into the pipe tree so you could test the control
    Long Beach Ed