Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit https://heatinghelp.com/contact-us/.

is there an overfill cutoff solution when switch sticks in 157S control?

MalcolmMalcolm Posts: 14Member
I have a Boilersmith 30 hp steam heating boiler and occasionally the switch or switches stick in the 157S condensate return pump controller. Yes I am ordering new switches but it seems odd there is no protection against this failure - it causes flooding downstream (where there is not supposed to be a stream). I have a water detector sensor in the top of the remote condensate return tank and it has worked well but that tank is not a boiler. Is there a standard practice solution out there?

Comments

  • Jamie HallJamie Hall Posts: 10,451Member
    There's another thread on this -- look for high water cutoff. There doesn't seem to be a standard solution, though...

    You are probably already aware that condensate return tanks and pumps -- as opposed to boiler feed tanks and pumps -- are prone to overfill problems, since even if the switches don't stick the condensate float and pump have no way of knowing how much water is already in the boiler -- and will merrily feed whatever is in the tank, regardless of the boiler water level. Since boiler feed tanks and pumps are controlled by the boiler water level, they won't do that (although they have been known to overflow onto the floor..).
    Jamie



    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.



    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • EBEBRATT-EdEBEBRATT-Ed Posts: 5,786Member
    edited February 18
    If you have a boiler equalizer or header drip you could install a "boiler overflow trap" You cut a tee in the equalizer just below the top gage glass connection. On the branch of the tee a gate or ball valve, strainer and stem trap. I would use a 1" trap. Pipe the trap into the condensate or boiler feed tank.

    The 150 pump control switches can be troublesome. The older mercury switches seldom failed but I and others I know have had some issues with the new ones. Always the same issue overfilling the boiler, have taken the controls apart, cleaned, cleaned pipe connections etc they work for a week or so and flood etc saga continues

    Wondering if pump motor amps has something to do with it? Maybe switch can't "let go" Maybe go pilot duty using a relay
  • Jamie HallJamie Hall Posts: 10,451Member
    Hadn't thought of the boiler overflow trap idea, @EBEBRATT-Ed . I always learn something on here... brilliant.
    Jamie



    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.



    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • EBEBRATT-EdEBEBRATT-Ed Posts: 5,786Member
    @Jamie Hall
    I must say brilliant has never been used to describe one of my ideas LOL. See them on a lot of commercial jobs. More often with pumped returns/multiple boilers. Good cheap insurance
Sign In or Register to comment.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!