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Old 11-09-2009, 12:48 PM   #1
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Wiring a geothermal pump


I have geothermal radiant heating under my floor. Currently I have 7 zones within the house and each zone has a pump. I also heat my hot water through the geothermal well, which has a seperate pump. I now want to replace all of the zone pumps with zone valves and only have a single pump to operate the whole system. The single pump needs to turn on under 2 circumstances, when the aquastat says the water in the hot water tank is too cool, or when the thermostat say the house needs heat. Ignoring for the moment on how to wire the zone valves to open ( i think i know how to do this), how would i wire the pump? My concern is to have both the aquastat and the thermostat to come on at the same time and overload the pump.

Thanks for the help
Gary

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Old 11-09-2009, 09:52 PM   #2
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Wiring a geothermal pump


Call an electrician

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Old 11-10-2009, 09:19 PM   #3
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Wiring a geothermal pump


I had to laugh here, the last 'geothermal pump' I wired was 800 HP and ran on 4160 volts 3 phase.

Seriously though, simply connect the pump control circuit in parallel with both switches. That way, either one of them will start the pump, and it'll continue to run until both switches are off.

Rob
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Old 11-13-2009, 10:58 AM   #4
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Wiring a geothermal pump


Thanks for the response!

I had an electrician tell me i need a relay. Is this true and if so what type of relay would I need? Also every diagram that I see about wiring someting in parallel shows multiple loads with a single line feed. In this case I need multiple line feeds with a single load. How is the wiring different?

Thanks,
Gary

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Old 11-13-2009, 10:57 PM   #5
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Wiring a geothermal pump


Paralleling switches is pretty easy. Hook one of the switches up like it was the only one. Run another two wire cable from the first switch to the second. At the second switch, put one wire under each terminal. Do the same at the first switch.

When you're done, you'll have two wires under each terminal at the first switch, and one wire under each terminal at the second switch.

If you've ever wired receptacles, those are parallel too.

Rob
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Old 11-14-2009, 03:30 PM   #6
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Wiring a geothermal pump


I have wired receptacles. Thank you very much for the help.

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