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Tool Talk Discussion Forum

Re: Heat Pump Water Heater- Need Help

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06-26-2014 15:02:47

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When you try to start it, you said that fan, pump, compressor try to run, but since compressor won't start, that the fan & pump won't continue to run. What is shutting them OFF? Are you shutting it down manually? Circuit breaker opening? Or what? Circuitry looks like fan & pump would continue to run even if compressor won't start & that compressor's attempt to start would eventually open it's overload protector (that "extra part" you mentioned near compressor "C" terminal.

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06-26-2014 15:34:41

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 Re: Heat Pump Water Heater- Need Help in reply to JMOR, 06-26-2014 15:02:47  
I let it try several cycles before turning the switch (the one we added) off. Circuit breaker has never tripped. The black wire to Fan comes from terminal 4 on the relay. The black wire to Pump comes from terminal 8 on the relay. I guess the relay refuses to latch leaving them cycling?

That's the other component next to "Comp C", it's a relay. Took a headlamp to read it, sorry. Labeled CR on the wiring diagram. Makes sense, compressor relay. Along with the fan and pump. Your 240 v. guess looks better as we go along.

Ooooh, I'm a dummy. The terminals aren't labeled on the relay, but the wiring diagram shows which is which. 1 on the relay goes to H1, 0 goes to pressure switch and indicator light. The other side of the pressure switch goes to H2. Still not sure how it works, but I'm getting closer.

Got lost on your drawing and was just attempting to figure out your open email. Greatly appreciate the offer, I'll figure it out.

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06-26-2014 15:40:04

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 Re: Heat Pump Water Heater- Need Help in reply to VaTom, 06-26-2014 15:34:41  
I failed to find an email address for you JMOR, but I think I just posted mine. I'm getting a little fuzzy myself by now, but sure would like to talk if you have time tomorrow, or soon. No problem for me to make the call.

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