Circulating pumps always on

Discussion in 'Boiler Forum' started by gordonp1, Oct 15, 2010.

  1. gordonp1

    gordonp1 New Member

    Messages:
    2
    Location:
    Pittsburgh
    I just got a new boiler installed (Laars Mini-Therm II 160) with two circulating pumps. The plumber wired the pumps to be always on. My old system would turn on the pump only when heat was demanded. The plumber claims that because I have an old system with dirty water and particles, the pumps would be damaged if they are off for a long time. I have two B&G NRF-22 pumps that use together 194 watts - that translates into about $240/year just to run these pumps. It just does not make sense to me. Is he right? I would like to tell him to rewire it so that the pumps start when thermostat turns on.
  2. peter_

    peter_ New Member

    Messages:
    6
    Location:
    NYC, US
  3. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    Speaking of financial tradeoffs, how much to clean and maintain cleanliness?

    Are those pumps rated for continuous duty?
    Last edited: Oct 16, 2010
  4. gordonp1

    gordonp1 New Member

    Messages:
    2
    Location:
    Pittsburgh
    They are rated for continous duty. I do not have any filter or strainers installed. The old boiler pump ran without any problems for 17 years with a boiler that was about 40 years old.
    We have been in this house for 17 years and no problem with the pump being off when there is no heat demand. I don't mind if the new pumps are on during the heating season but to keep them running from March to October?
    Where can I find information about installing a filter or strainer?
  5. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    Apparently seasonal startups are a problem, which they try to overcome with high starting torque, but they don't say the cause of this problem.
    http://www.bellgossett.com/productpages/parts-nrf-22.asp
    Maybe all pumps with clean or dirty water have this problem. Something must seize up.

    I guess another fix would be to periodically run the pump with some kind of timer, say 1 minute on once per day or per week, regardless of water demand.

    One or both pumps failing would cost how much? More than $240 each year?
    Last edited: Oct 16, 2010
  6. david_griffin

    david_griffin New Member

    Messages:
    25
    Location:
    Denver, CO
    He was not right. Pump must run only over certain temperature because if the water is cooler then this water steals heat. Your pumps not only heating your house but mostly cooling rooms. Pumps should stop if no heat demand from the furnace.
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