High super heat, high subcooling, variation in suction pressure

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Old 08-27-16, 03:36 PM
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High superheat, low subcooling, variation in suction pressure

Hello forum,

I have a trouble with my upstairs R22 split AC system. I'm not sure if I have a fixed orifice or TXV as the evaporator box is sealed and I cannot peek there.

I got a K-type thermometer and manifold gauge set and measured superheat being 51F and subcooling 7F. Target superheat is 19 to 20F.

Also, I noticed the low pressure side fluctuates between ~55 to 65 every few minutes, high pressure side seems fluctuate less.

Should I add R22 or what might be wrong here? Should I add R22? Can the pressure fluctuation be caused by a bad compressor valves?

Thanks for the help, in advance.
 

Last edited by pics20; 08-27-16 at 04:33 PM.
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Old 08-27-16, 05:40 PM
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Sorry but we do not offer sealed system advice as you must be qualified and certified to handle refrigerants.
 
 

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