Look at the oil in old compressor,is it black? Smell gas,oil or internal component,does it have a sulfur or burnt odor? If the answers are yes any part the system that contacts refrigerant must be professionally cleaned. Any "blowing out" should be with dry nitrogen. Plug openings to prevent dirt and insects entering while disassembled. NO,new refergerant does not contain oil,oil must be precisly measured and put in new system "UNLESS" new compressor is shipped precharged with correct amount of oil. Do not unplug and leave new components open one minute longer than nessary. Route and fasten hoses but leave plugs in them until you are ready to hook it up. Same for drier,compressor and other parts,try and make all connections at the same time but it's ok to connect hose to one side of condenser,compressor,evaporator and leave other side/end for latter as long as other end/side remains plugged til latter. Be piticurlly carful about exposing drier to air,contrary to what "I heard and they said" tells you,evacuation does not reverse the effects of moisture collected by drier. If you are evacuating one day then charging the next,you should add a "holding charge" immediately after evacuation. A holding charge is simply any amount of pressure inside. 3 or 4 oz of refregrant is all it takes but one 12/16 oz can is fine also. In an ideal world the system should be pressurized with dry nitrogen because that will (A)tell you system is leak tight if pressure remains until system is charged latter (B)the N will instantly soak up any moisture remaining after evacuation. Normal proceedure call's for lubing connections with refergeration oil during assembly. Work clean ,work fast and don't open system when humidity is high if you can help it.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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