Got the compressor in yesterday but the darn thing came with no mounting feet....just a welded bracket on the bottom ready to receive a plate with feet. So I figured maybe I can use the feet from the old compressor....but no way..they are 4 separate feet welded on the original. Called PTAC about it, they eventually come back with "oh that is an option, we will need to know that it goes on !" Seeing as I can't trust "what it goes on" will be the correct bolt hole pattern, I think I will just make my own mount plate... will know more later today about that.
In the meantime...
1. I did order the Parker dryer you recommended but I'm not clear it that is supposed to replace the original dryer or added to the line somehow. Can you clarify that ?
Anytime you have to service a refrigerant circuit, you should add an acid removal filter dryer for clean up as a precaution. In bad burnout situations it is not optional and many also add a suction side filter which can be temporary or permanent. If the crud is bad enough the filters have to be changed as they get clogged and increase their pressure drop. The one I showed you is a bi-directional unit suitable for a heat pump. If you have cooling only then you only need a one way unit. Put the dryer in the smaller high side line after it leaves the condensing unit on the way to the evaporator or cooling unit as Cruisair calls it. I brazed flare filltings and short 1/4" copper lines on each end bending them to fit the unit so I can zip tie it in place. I attached directly to the high side service valve and the line connection for same. If you have access then you can also cut the high side line out in the open and braze the filter inline like you would normally do in residential AC.
2. The new compressor's three outlets are in different locations from the original and not labeled as to what is what. My HVAC guy thinks he knows what is what but any way to know 100 percentfor sure ? (third line is crimped and sealed on original so we need to know which one to do that to on the new one)
One line is the output or high side line and is usually smaller in diameter. The other two lines are usually both suction, one for the normal input to the compressor and the other one is a service port. This service port can either have a fitting brazed on or crimped and brazed shut. I don't know if they are interchangeable on all compressors but on mine the service port was the highest on the can. You reference a couple of variants on the compressor (EXD vs EXV) that you bought but here is a drawing for the EXD that may help:
http://www.tecumseh.com/~/media/Drawing-Data/North-America/Sales-Drawings/DCAE401-CHG-_H-C-C.pdf
Please confirm which exact model that you have.
FWIW, I did not order the acid test kit as my guy say's he's going to "flush the system" anyway.
