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Hvacwin 06-04-2012 08:50 PM

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?

clocert 06-04-2012 11:01 PM

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 )

beenthere 06-05-2012 04:59 AM

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.

HVACDave 06-05-2012 07:44 AM

How are you performing the calculation? Are you remembering to use absolute values? If not, that can really throw off your result.

beenthere 06-05-2012 04:16 PM

Need to add 14.7 to the gauge reading. or what ever your altitudes atmospheric pressure is.

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