POE oil breaking down and forming "wax", and plugging up driers and cap tubes is fairly common on small systems. As noted its usually caused by running for a long time with a dirty condenser or non-functioning condenser fan motor, which overheats the oil and turns it into wax.
You should see what some of that cooked oil looks like, kind of dark with small chunks in it. After you drain it, you can tell why the cap tube and drier keep plugging.
If its really bad we will pull the compressor, drain the oil, and refill the compressor with new oil. Also flush out the system as best we can with nitrogen and maybe some rx-11.
For driers on cap tube systems, I like the Sporlan C052CAP-TT-HH
Its amazing how much money people will spend to repair, instead of replace. Its like they have it in there head - they look at a 10 year old reach-in, and say "theres no need to buy a new one, this things only a couple years old"
I had one small system I worked on for literally six hours. I put a new cap tube in, drained oil in compressor and refilled, then I actually took the condenser out and blew rx-11 in it and shook it, turned it upside down and drained all this black sh** out.
Well you can do what I always do. When you get everything up and running you can drive off in your van singing "Good Bye, Ruby Tuesday".
Originally Posted by timebuilder
Yeah it probably wasn't worth it but I got paid for my time, thanks for all the explanations... Man I hate those continental boxes
So rx11 is a flush that can be used for ac and refrigeration any other flushes you use ?
I've only used rx11 from nucalgon, that seems to be the only flushing solvent the wholesalers around here carry.
Originally Posted by AllStateTech
I don't use it all the time, usually only if there is a restriction inside of a coil or if the tubes are full of baked oil or burnout residue, stuff like that.
I know its a volitle solvent and will evaporate, but I don't like the idea of the residue of whatever it flushed being left in the system. So whatever I am flushing, I will typically cut the tubing at the low spot (ie. bottom of the coil, low spot in tubing) and blow it out with nitrogen when I am done, so all the crap will drain out.
Yes, knowing full well that next time might be my 19th nervous breakdown, and I can't get no satisfaction.
Originally Posted by Mike19
But, time is on my side.
[Avatar photo from a Florida training accident. Everyone walked away.]
2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
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