Re: Air Conditioning Questions--!!

Posted by Joe (Wa) on May 15, 2001 at 21:47:20 from (198.133.237.130):

In Reply to: Air Conditioning Questions--!! posted by Pappy on May 15, 2001 at 16:51:17:

Pappy, If your system has a receiver, overcharging will cause high head pressure due to liquid refrigerant backing up into the condenser reducing the condensing capacity. If seriously overcharged the suction pressure will be abnormally high because the compressor will be overloaded. Feel down the condenser tubes with your hand when the system is at normal operating temperature. Be careful, the top tubes should be too hot to touch. The further down you go, the temperature should decrease with the bottom tubes comfortably warm to the touch. Your receiver and liquid line up to the expansion point should be warm (90 degs or so). If you do not have a receiver, the system condenser will be sized to accommodate liquid refrigerant in the lower tubes to act as a receiver. In this system you will feel a distinct drop in temperature @ the gas/liquid interface. Adjust the charge to have liquid in the lower 20% of the condenser. The purpose of the liquid in the receiver or receiverless condenser is to keep the expansion valve or capillary tube pressed up with liquid, not to provide extra refrigerant in case of leakage. All refrigerant pressure gauges have a press/temp scale. The press/temp relationship applies only to the type of refrigerant your system has (134a, R12, R22, etc) and only at the gas/liquid interface within the system I.E. in the condenser and in the evaporator. Did you evacuate the system before charging? If not there is non-condensable air in the system, forget this post and get some professional help. Good luck, Joe

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• Re: Re: Air Conditioning Questions--!! Pappy 19:49:15 05/16/01 (0)

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