I always change the oil in new builds that use HFC's, the exception being some experimental units for myself. Most HFC refrigerants like r134a, r404a and r507 require POE oil for miscibility. It is possible to just add 5-10% r290/Propane (by weight) to these HFC's for miscibilty with AB or mineral oil. Yes, that is definitely a much easier and cheaper option than performing an oil change, especially on a rotary compressor.
POE oil has a much higher resistance to thermal breakdown and a lower pour point than AB or mineral oil. Those are the main reasons I change the oil. Not to worry flocko.. you can run that compressor on the bleeding edge for all the benching you can throw at it. Just keep it close to the specs I mentioned.
Thanks, I tried to make the guide easy to follow. I'll be at work the rest of the day but will check in every few hours to see if you need help.
Answers to your edits:
Edit : Lol.. reread post #60 http://www.overclock.net/14487094-post60.html
Edit # 2 Just check it against your k-probe and calibrate as needed. Obviously use your UEI meter for all testing.
Use a k-probe sensor with a dab of ASC on the filter/drier . Maybe tyrap it with a piece of foam tape so you don't damage the clear coat. The infared won't be accurate enough there due to the small radius. You can try the infared on the lowest part of the condenser end plate if you don't have anymore probes.
Lastly, it is crucial that you keep the case sealed during testing as the rear exhaust fans will have a huge impact on performance with this design. I see you have some painters masking tape there, perfect so you don't lift that paint finish. You can seal up the one side with the aluminium panel.. the other side with cardboard. Cut some small notches for the hoses and seal then with tape. Cut a 2" "U" shaped trap door even with the top 1/3 of the compressor for taking infared temp readings on the compressor. Cut a trap door for the lower condenser if you don't have an extra k-probe for the filter/drier.
Have fun tuning!Edited by Drewmeister - 8/7/11 at 10:56am