Charging a window air conditioning unit

 Get you an A-2 tap and place it onto the fat suction line going into the compressor .
attach the blue hose to the A-2 line tap.
attach the bottle of R-22 to the yellow hose .
attach the red hose to the vacuum pump
open all hoses (leave freon R-22 bottle closed for now).
pull a good vacuum down to neg 30 if possible
for at least 30 minutes
then shut off red hose and vacuum pump
wait 10 mins to see if vacuum holds
proceed to open R-22 and open the blue hose,
allow freon to go into unit and equalize,
then turn the unit on...slowly add the freon till it gets to 68 PSI over charging will cause it to choke down .
use a clamp on ampmeter to make sure the ac head pressure does not cause excessive amp draw. (skip this step if you aint got one)by the way if your gauges aren't working you can charge a unit by using a clamp on meter . when the amp draw gets to where the total amps of the unit (on the serial number plate),then it is just about right. confused now? LOL anyway if all the moisture is properly removed then charging should be pretty easy, some take a long time to charge some take a short time. depends on the pump(compressor)

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