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Thread: cold water surge in re-circ system

  1. #1
    DIY Junior Member Artcraft's Avatar
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    Feb 2010
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    California
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    6

    Default cold water surge in re-circ system

    I replaced a re-circ line for a client, water heater and added uponors demand pump with motion sensors. While showering about five minuits into and at approx recurring intervals the water is not going cold but just going to lukewarm for about 5 seconds and then returning to normal temps. this happens in both showers in the house older non pressure balanced valves. I replaced the line with pex could have the velocity increased due to the smaller inside diameter of the pex and could this be effecting the older valves? Any other thoiughts
    thanks

  2. #2
    DIY Senior Member Jeff1's Avatar
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    May 2006
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    So Cal
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    102

    Default

    What is the time interval on the motion sensors?

  3. #3
    DIY Junior Member Artcraft's Avatar
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    Feb 2010
    Location
    California
    Posts
    6

    Default

    Once water reaches temp aquastat shuts pump off. does not allow motion to turn it back on untill after the water at the aquastat cools off. I replaced the pump once thinking the intragal check valve was bad, uponor was great to deal with but it did the same thing
    thanks

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