AC,
The top cover says 37 pints cap. I have plugged it into a kill a watt and am getting a pretty steady 320watts X 2 X 3.412 gives me 2,183.68 BTU's/hr.
This is without the condensor fan running, I pulled the wire off for testing.
There is a low side tap on the unit as you were saying it must be pretty old, before walmart and the shaving of pennies off each device to make a few more dollars off us all.
I have two more window units and see them on craigslist fairly regularly. I think I would like to at least try to recover the refrigerant with a setup like what you showed. I have a friend that does heat and vent work for a living if I get into a bind I imagine that I could get him to help. There is no magic involved in any of this work just fancy math (I am not good at) and wanting to play with something to see what you can make happen. So I looked on granger.com last night and see you can buy all kinds of refrigerant (with proper paperwork) but no R12.
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