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Tool Talk Discussion Forum

Re: Heat Pump Water Heater- Need Help

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George Marsh

06-26-2014 15:03:02

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VA tom,
Your 189-227 mfd 125 v might work for just a second or two wired in parallel with run cap. If the wiring inside compressor is good between common and run and common and start, then the larger cap should knock it loose.

Try it and post back,

FYI, the average life expendency for a heat pump is less than 15 years. That is the average, not to say some people will have better luck, some not.

In your case, the compressor is used all the time, so your compressor may have used up all it hours.

As for air conditioning, I won't live without one where now in Indiana the dew point temps are around 70. Open up the house and everything will get damp, expecially the basement. Dampness will cause mold and mildew. I have to run the A/c. It really doesn't cost that much. My average 12 mo electric bill last year for a total electric 2000+ sq home, no heat pump, and workshop was only $134/mo. I might be cheap, but I think it's the best money I spent. George

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06-27-2014 07:10:11

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 Re: Heat Pump Water Heater- Need Help in reply to George Marsh, 06-26-2014 15:03:02  
Thanks George. Sometimes it doesn't take much to confuse me.

This did it, came back from my shop with the wires to connect that extra capacitor. Then I looked at the wiring diagram again. The Run wire goes directly to L1, hidden interconnection on the black capacitor. Confirmed that with those resistance measurements you suggested.

Only the Start wire has the benefit of that 15 mfd capacitor. Did you mean in parallel to the Start cap? What you wrote was "wired in parallel with run cap", doesn't appear there is one.

Knowing nothing about these, I'm hesitant to experiment without expert help. Yours is appreciated.

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George Marsh

06-28-2014 11:46:21

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 Re: Heat Pump Water Heater- Need Help in reply to VaTom, 06-27-2014 07:10:11  
Yes, one side of the start cap goes to the start terminal of comp and the other side goes to the run side of comp. That will mean the two capacitors are in parallel. Only power up for a second to two. Compressor should start if it's not locked up or burned up internally. If compressor is good, then order a HS kit from ebay or get from a person in the HVAC business. Doubt if a supply house will sell to you. Wish you had a larger voltage on start cap, so if it doesn't blow you should be good, if not you will have a little excitement.

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06-26-2014 15:59:54

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 Re: Heat Pump Water Heater- Need Help in reply to George Marsh, 06-26-2014 15:03:02  
Thanks George. I'll try that in the morning and report. Appreciate your lifespan information. This heatpump was only used when we needed hot water and only for 5 months per year. Run about 300 times per year for a few hours. Run time dependent on interior temperature.

I of course have no idea about the quality of these units, just that they fit into our situation very well.

If this thing is only stuck from sitting so long, fantastic! Though I'd still like to pursue repair of the other one. I mentioned finding comfort with spares, of almost everything.

We completely agree on dehumidification, but not ac. If your ac is primarily dehumidification, the only complaint I'd have is the initial cost of it.

That's exactly the case of the other PAHS just down the road here. His house temps are the same as mine, his ac is primarily a dehumidifier. He needed that initial expense to get a mortgage. I didn't. I've never paid more than $50 for a dehumidifier. Cheap, I understand.

A passive dehumidifier would be ideal, but the closest I've found are "air wells". Haven't tried one yet. Interest in them is getting water in arid places, but what they do is condense water out of the air. That's dehumidification.

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George Marsh

06-26-2014 18:05:23

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 Re: Heat Pump Water Heater- Need Help in reply to VaTom, 06-26-2014 15:59:54  
You have no idea how much water my two dehumidifiers in the basement and my Centeral air removes form my house.

One time my condensation pump on a/c failed and I put the water in a 30 gallon plastic trash can. It didn't take very long to fill the can.

I know cheap elderly people who don't air condition. Their house smell from moldy carpet, furniture, beds. You can call it indoor air polution. No thanks.

I worked on commercial furnaces and large chillers at Bethleham steel Burns harbor, In. Paid my way trough college doing that. I learned if you have a well built home, Air conditioning is very cheap.

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06-27-2014 04:48:19

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 Re: Heat Pump Water Heater- Need Help in reply to George Marsh, 06-26-2014 18:05:23  
Actually George, I have a very good idea. You keep talking about it. I also deal with folks in a wide variety of climates, from arid to extremely humid, beyond Indiana.

A good approach would be to examine where your excess humidity comes from. Is it air changes bringing in outside humidity? You know what happens to rh when you bring hot air to a cooler environment. Is it water put into the air by your house and/or occupants? Take a look at the source(s) and you may be surprised.

We agree, dehumidification is critical, ac can be and often is used for that. The cost is always higher than simple dehumidification. With both, it only makes sense to examine the need and try to reduce it. Depending on your house configuration, you might find ROI on a heat pump water heater very short. Combination units (with tank) are widely available. I fault the manufacturers for not stressing that free byproduct (cool dry air) we find so beneficial.

We accomplish a total air change every 2 hours. I bring in dehumidified air this time of year. My house is slightly pressurized, air leaks go out. We're also careful about adding humidity from the way we live here. Our house doesn't add any water to the air, but that is a common problem.

You're confusing your elderly acquaintance's problems with lack of dehumidification. Controlling the temperature with ac is not the same.

Go one step farther George, consider how an even better designed building doesn't need air conditioning. There's one in Indiana, Chicago area. Another project waiting for an excavator SE of Terre Haute. As everywhere humid, controlling rh inside is a necessity. An Atlanta house got an interesting combination of systems, but no ac needed or bought.

We go for simpler, maintenance-free (if possible) systems with low upfront cost. Makes for easy living. No worries about a failed condensate pump for instance, if there is none.

The Oklahomans (Tulsa and Norman) found that attractive, almost as much as a house that won't blow away in a tornado.

OK, I'm off my soap box now. Time to get back to my cheap effort to salvage these heat pump water heaters.

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