So here goes...
Helped a co worker with a 5H86 compressor change yesterday and sort of pulled an executive decision on him and he seemed surprised.
Thought I would throw it up here to see if I owe an apology.
So the original system was utilizing mineral oil, this is in a commercial air conditioning system serving an office building.
We literally just started caring for this site, but I had worked at this building 10+ years ago and made recommendations back then that were never carried out by the building owner.
So here are as many specifics that I can think of off the cuff...
5H86 compressor on an evaporative condenser, two circuits, one compressor per circuit R22.
This thing had a catastrophic compressor failure, not exactly sure what came first, but lets just say there was melted babbitt in the bottom of the crankcase and was seized. Oil failure switch tripped as did the manual reset high pressure switch, but unfortunately some dumb ass circumvented these controls electrically. Needless to say, the compressor was not rebuilt, but a reman. POS was installed.
So here is the meat and taters. The new compressor has an alkyl benzine oil charge from the remanufactures., The lead tech wanted to change it out to the C3 mineral, but I told him to run it with the Zerol for a week while the cleanup driers are running and change the oil with the drier change (back to Alky).
Did I make the wrong call? This thing got hot enough to burn all the paint off the compressor and bbq'd the oil pretty good. The refrigerant is stinky like burnt oil, but passes a Totaltest with flying colors.
I have pulled a refrigerant sample and sent it in, but wont have the results for a few days.
My thinking is that the alkylbenzine will pick up and somewhat wash the burnt carbonized oil and push it to the filters. Am I making a mistake letting him mix oils? I have read up on doing this and it feels like the right thing to do.
The recommendation I made several years ago was to add oil coolers to these compressors, they are strokers and do not have coolers, I was seeing oil seal temperatures in the high 130 degree temps (F).
Will the alkylbenzine oil take heat as well as the mineral? It is going to run a little warm regardless.
What say you?
Thank you in advanced.