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Erratic Shut Off

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eleft(retired)
eleft(retired) Member Posts: 98
in THE MAIN WALL
Does the thermostat have an anticipator, check the setting???


al

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  • Bill_4
    Bill_4 Member Posts: 16
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    Erratic Shut Off

    Ive got a customer,the systen has zone valves,when the zone calling for heat is satisfied it will shut off,then the pump will run for 10 seconds shut off then run for 5 seconds then shut off then run for 2 seconds then shut off for good. Any suggestions? Bill
  • don_9
    don_9 Member Posts: 395
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    Tstat

    > Does the thermostat have an anticipator, check

    > the setting???

    >

    > al



  • don_9
    don_9 Member Posts: 395
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    High impedance

    Tsat,What type,If electronic you may need to add resistor or a interface relay.
  • Ray Liotti
    Ray Liotti Member Posts: 4
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    Erratic shutoff

    Is the end switch on the zone valve operating the circ? If so, the end switch may be loose and/or bad.
  • Unknown
    Unknown
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    Erratic shut off

    What kind of Zone Valves? Is the end switch bringing in a relay which then brings on the circulator? What is the model and make of relay.

    Suggestion if you can catch this happening, disconnect the wire from the end switch on zone valve if it fails to run then your problem is the zone valve. If it still keeps doing the same thing then I would suspect the relay.

    The last thing to check is to make sure you do not have a Taco or similar Power Port Card such as a PC610 Universal Timer/Pump Exercise Plug In Card. If so it could be malfunctioning.
  • heatboy
    heatboy Member Posts: 1,468
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    I'll wager..........

    it has the infamous Taco 3 wire zone valves. If so, there is your issue. Check each powerhead operation and you will find the one that is short cycling. The power head can shortcycle on both start and finish, but primarily on shut down.

    Warm Regards,

    heatboy

    climatecadvanced.com

    To Learn More About This Contractor, Click Here to Visit Their Ad in "Find A Contractor"

    There was an error rendering this rich post.

  • Greg Gurecki
    Greg Gurecki Member Posts: 22
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    Zone Valve

    I would install a isolation relay . We do all the time seems the zone valves act up o n a number of aquastats
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