Keep adding charge until your superheat drops to as close to 10 degrees as you can get it without putting your sub-cooling over 20 degrees, “give me that 10, 10” I say If the system is still low on Freon the superheat will be higher than 20 degrees. If you charge wrong here the machine still may work but the compressor will fail years earlier than if you charge right. 16-18 degrees of superheat will keep this compressor running for years to come. These are the 3 main points to watch when charging and you will never get them all perfect but, you can adjust some and get the 3 as close as possible. Keep charging through the suction on for 10 seconds and off for 20 seconds until you reach as close to your 10 degrees of superheat, 20-30 degrees over ambient temperatures for the head pressure and as close to 10 degrees of sub cooling as you can get. You’ll notice the compressor is still low on charge, open your suction gauge to charge the system through the suction only.ġ1. Now that the new compressor is running were in the clear and home stretch. Or, if it pulls over 30 amps on start, you need to install a hard start kit in step 16. But, if it does not start, go back and find out where you miss-wired the compressor. The new compressor should turn on and pull less than 3o amps, if it does continue charging. Plug in disconnect and turn on air conditioner. Now put your amp probe onto the common wire for the compressor and turn it on then set it to AAC so we can watch the compressors starting amps. Close down both dials suction and high side on the gauges. ![]() Let it drink all it can and when it stops or slows to the point that it seems pointless. Hook up the recovery jug full of r-22 to the gauges as shown in diagram 8-A open the gauges and tank to allow Freon to flow to the air conditioner. Ok, now you’re stabilized below 1000 microns, let’s re-charge the system.
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