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Tool Talk Discussion Forum

Re: Heat Pump Water Heater- Need Help

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06-26-2014 12:35:47

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OK, I'm coming along. I added a #5 question later. Take a look at it. Also, when you try to start it & compressor only humms, does the fan & pump run?
On the cap, one side should have the red wire from the L1 terminal AND the red/run wire from the compressor on it and the other side of cap, only the yellow/start wire to compressor.

Is that the way you have it?

My opinion is that this all runs off 240v. I see no NEUTRAL & fan, pump, compressor are seeing L1 to L2. Relay is switching L2.
I see no thermostat? What turns it on & off?

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06-26-2014 14:07:08

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 Re: Heat Pump Water Heater- Need Help in reply to JMOR, 06-26-2014 12:35:47  
"I see no thermostat? What turns it on & off?"

Sorry, I wasn't clear. That is the switch T_Bone and I added, in the photo on the right of the heat pump. My lovely wife hasn't complained all these years of not having automatic hot water.

It was only when I replaced a leaky tank heater that I discovered the mismatch between components (heat pump and new tank heater). With a new tank heater just installed I preferred not to remove it and buy another one with a different control.

Which probably is why manufacturers now mostly (only?) only sell tank heat pump water heaters, not add-ons. I wouldn't mind IF the tanks lasted like the ones of old. I got 13 years out of the heat pump, haven't had a tank last that long recently.

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06-26-2014 13:46:40

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 Re: Heat Pump Water Heater- Need Help in reply to JMOR, 06-26-2014 12:35:47  
Quoting Removed, click Modern View to see

I expect you've seen my later answer to 5. This is gonna strain my brain. Lots of wires, turns out there were two jumper wires between L2 and H1, the old heat pump was missing only one of them.

As this all started with a dripping/smoking capacitor, it was only connected to L1, along with comp Run. Yes, L1 and comp Run were connected to the same cap terminal. Yellow (comp Start) went to the other side of the capacitor as the diagram shows. I just checked the defunct heat pump, the wires aren't long enough to do anything else.
Both fan and pump make noises, but don't stay running without the compressor starting.

I got the wiring diagram from the relay. Not helping me. The terminals are not numbered. Whatever the box between 0 and 1 is, it's intact on both, 39 Ω.

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06-26-2014 14:08:12

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 Re: Heat Pump Water Heater- Need Help in reply to VaTom, 06-26-2014 13:46:40  
OK, I understand the relay, but not what is controlling it. What is the source of the pressure switch that the pressure switch is monitoring? Is it a freon line (large/suction , small/high pressure or water pressure? Did you just turn it on and let it run continuously or is there something that automatically cycles the thing?
I am about to send you a re-draw of the diagram that a human can actually read. My e-mail is open in MODERN VIEW & if you would like to chat, send me a phone number & I will call you.

This post was edited by JMOR at 14:27:44 06/26/14.

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06-26-2014 14:48:07

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 Re: Heat Pump Water Heater- Need Help in reply to JMOR, 06-26-2014 14:08:12  
The relay is a mystery to me.

The tiny copper line to the pressure switch goes to the same place as a similar line that goes to the coils. I guess that's freon.

If we left it running continuously, the pressure switch would turn it off. That made me nervous, so we measured water temperature at a faucet and turned it off around 120. Bit of an inconvenience, but we aren't people who need everything done for us.

It is annoying if the first showerer doesn't remember to turn on the heat pump. Only a short delay every summer until we get into the swing of things.

Dehumidification in the house isn't automatic either. We measure it constantly, turn on dehumidifier(s) as needed. Had one die this year, grabbed one of my spares a friend had given me. He'd said it worked great, until the control failed. Bought another control which failed soon after. He gave up and bought a different brand.

I wired around the control, bypassing it entirely. Now it's on or off, only on high. Works perfectly for us, my wife's delighted. Far stronger than the one that died.

Heat pump is similar.

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06-26-2014 15:02:47

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 Re: Heat Pump Water Heater- Need Help in reply to VaTom, 06-26-2014 14:48:07  
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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