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I use 5-6 ounces of oil. I think 8 is too much. The danger is that the excess oil covers the evaporator and decreases it's ability to provide cooling. The 4oz you got out of the new compressor is plenty.
Also, with respect to filling, it is better to fill a conversion by pressure rather than weight. 1.9 lbs is a good general recommendation, but the system will probably need tweaking from there.
$100 to vacuum your system and refill is a rip off. Especially since you just gave them r-12 they can resell for $150. But, if they are the only ones who will do it....
Go to http://www.acsource.com and look at the venturi type pumps so that you will know what you are looking for. I bought the mastercool one. Your gauge set should have 3 hoses, blue, red and yellow. Blue is low side, red is high side, and yellow is charge hose. The pump attaches to the charge hose. You screw the charge hose onto the front of the pump, connect the rear of the pump to the air compressor and then open both wheels on the gauge set. This type of pump will run your air compressor for the entire time the pump runs. I have a Sears air cooled compressor also and it's really loud for an hour. It's probably not that good for the compressor, but I haven't had any problems and I have been doing it for a while.
If you are going to refill yourself be aware of one dangerous piece of advice in the Townsend write up. Townsend says to fill through the high side. That applies ONLY IF FILLING INTO VACUUM WITH COMPRESSOR NOT RUNNING. If you fill with the compressor running, or if it will start running as you add the refrigerant, charge through the LOW SIDE ONLY. Personally, I just NEVER charge through the high side so that there is no potential for confusion.
If you are going to fill using cans, there is no need to turn the can upside down as some recommend. Turning the can upside down charges as a liquid rather than a gas. Charging as a gas is safer in that the can is much less likely to blow your hand off. After the can is attached to the gauges, open the low side valve and then place the can is a container of medium hot water. The heat on the can will push the gas right out of the can. Otherwise it will take hours. And don't stand there holding the can while it is charging. There is always that one in a million misfortune.
posted by 24.50.5...
, Sat, 4 May 2002 00:38:00, Sat, 4 May 2002 13:17:20
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