I have a 141,000 BTU Pool Heat Pump based on a Trane compressor, and it recently blew its transformer.
The AC tech came out and said "It would be $500 to replace it, but we don't have a 24v/12v transformer, so I can't guarantee we can do it."
Left high-and-dry, I researched it on my own... I replaced the original dual-tap transformer (12v/24v) that was a 40VAC with the only dual-tap I could find, a 96VAC unit: Steveco 90-T96F2 here: http://www.drillspot.com/products/12...ol_Transformer
...After replacing the transformer myself, verifying that the electronics work again, I contacted the AC guy to come back out. I never received a return call after two weeks of trying, so I was on to my second AC guy...
The next AC guy told me that there was no voltage at the COMPRESSOR CONTACTOR and that the entire circuit board would need to be replaced. He did not want to spend more than 5 minutes with it, so he charged me a 1.5 hour fee, for 10 minutes of "review", and left.
After a second time of being left without a solution, despite paying for one, I decided I would take a look on my own. Here is what I found:
Everything works fine if I push-in the COMPRESSOR CONTACTOR, so I am sure it's just a matter of getting voltage to the contactor. When I test the voltage @ the contactor, while it's connected, I get nothing. If I disconnect the leads from the contactor, they are providing about 21V.
Not being a professional HVAC person, I'm stumped and out of my league:
(1) How could the Heat Pump's control panel be supplying voltage successfully, but when connected to the CONTACTOR, I do not register any voltage? Could it be that the one leg of the wire feeding the contactor is shorted in the contactor?
(2) Why is the voltage being supplied to the contactor, only 21v? When I test the transformer's 24V leg, it's putting out about 28v. Does the contactor need a full 24v to switch? Does this sound like it could be the source of my problem?
(3) What is my best "Next Step"? Should I just buy a new contactor and try replacing it, or should I try to trace down something else?
This is not my bag and I'm doing the best I can because I'm afraid to spend more money for a guy that just charges me money and leaves. I desperately need a "next step" -- any feedback you can provide would be greatly appreciated, or if you are in South Florida and you feel you would like to service the unit, please let me know.
Thank you in advance,
RKM in WPB, FL