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Old 06-04-2012, 09:50 PM   #1
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Just a question...


Was informed the pressure ratio between the high side and low side should be roughly 3:1... What would be some causes if the pressures were closer to 2:1 or 4:1?

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Old 06-05-2012, 12:01 AM   #2
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Just a question...


Never heard people measure that way. If off to 2:1 or 4:1 as you said, is the high side off or low side off ? huge difference there. (Anyway, 3:1 is close to normal, but not always) (R-22 ? I assume )

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Old 06-05-2012, 05:59 AM   #3
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A 4:1 compression ratio may just be indicating a high load at the start up of the system. A 2:1 would be an indication of a weak compressor, or RV leaking through, or an over sized piston/metering device.

A lot of higher efficiency units will run lower then 3:1.
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Old 06-05-2012, 08:44 AM   #4
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How are you performing the calculation? Are you remembering to use absolute values? If not, that can really throw off your result.
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Old 06-05-2012, 05:16 PM   #5
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Need to add 14.7 to the gauge reading. or what ever your altitudes atmospheric pressure is.
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