Use recirc control in Noritz NRC1111DVNG?

Discussion in 'Tankless Water Heater Forum' started by lifespeed, Jun 6, 2012.

  1. lifespeed

    lifespeed Member

    Joined:
    Apr 27, 2007
    Location:
    California
    I installed a Noritz NRC1111DVNG with a Redytemp recirc pump at the water heater location. It is controlled by timer until the thermostat at the furthest sink warms up. During the rest of the day when the timer is off, manual rocker switches (kitchen and two bathrooms) will trigger the pump to heat the pipes.

    Noritz has an internal relay in this hot water heater that they claim is the preferred method of controlling the recirculation pump. I don't know anything about it, and am unsure how this could be an improvement on my Redytemp setup. If, for example, Noritz had an input (from the timer or switch) as well as an output (to the pump), I could see the possibility of cold water sandwich avoidance by firing the burner until the water was hot, and THEN turning on the pump. A trick that is not possible when the burner is triggered by water flow from a faucet.

    But I don't see an input in their manual, and there is little to no description of the logic controlling this relay.

    Does anybody know anything about Noritz's recirc pump control, and if it can be used in conjunction with my existing control to improve it?

    nrc1111_recirc.jpg
     
  2. screwdriverga

    screwdriverga New Member

    Joined:
    Dec 5, 2014
    Location:
    Georgia
    Were you able to get more information on this control logic?
     
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  4. lifespeed

    lifespeed Member

    Joined:
    Apr 27, 2007
    Location:
    California
    None whatsoever. Noritz pretty much said "just use our control output". The problem with that is it probably keeps the pipes hot 24/7 which is supremely inefficient. The timer/thermostatic/manual setup I have is far more flexible and only recirculates a few hours a day, the rest of the time it is under manual control.

    The only advantage I can see integrating with Noritz directly is it might be smart enough to light the burner at the same time it starts the pump, rather than waiting a couple seconds for the flow sensor to trigger the burner when the recirc pump starts. Then again, they may not do that and there is no advantage at all.

    The lack of documentation is really unhelpful, but I doubt the built-in recirc controller is better than what I have.
     
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