Erratic Shut Off

eleft(retired)

Does the thermostat have an anticipator, check the setting???


al

Bill_4

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

Tstat

> Does the thermostat have an anticipator, check

> the setting???

>

> al

don_9

High impedance

Tsat,What type,If electronic you may need to add resistor or a interface relay.

Ray Liotti

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

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

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

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Greg Gurecki

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