Originally posted by hvacbear
You've seen a compressor graveyard too?Originally posted by NormChris
Right, because you found the problem. But after 5 compressors just makes my point, few technicians are actually capable of performing a proper compressor failure analysis.Originally posted by hvacbear
Had one that blew out a compressor because our controls contractr wired it into the compressor contactor. The unit has a liquid line solinoid valve controled by a seperate t-stat and a time delay wire in series with the time delay in the phase monitor eventually wired into the low press control for the compressor. When the compressor came on 20 min after the solinoid valve opened dumping liquid into the suction it blew it's valves. There were 5 compressors previously and since we rewired it there have been none for over 2 years.
I have been on a number of roofs where there were two or three old compressors still sitting next to the system and the compressor in the system had failed yet again. Not only were the technicians unable to find the problem, they did not even have it in them to remove the evidence of the previous failures. That made my job that much easier since I had several compressors to tear down. Yup! All of them had failed from the same ultimate cause.
This is a good example why manufacturers like York, Trane and Carrier are calling for technician certification with NATE plus continuing education to keep certification current. The manufacturers want to reduce their warranty costs caused by technicians who don't have the knowledge to properly diagnose field problems or even install systems properly in the first place.
Just look at the vast number of questions posted on this site over such a simple thing as charging a system. Even our tech schools seem to be failing at teaching the most basic of service procedures; system charging.