Just a question...

06-04-2012, 09:50 PM	#1
Hvacwin Newbie   Join Date: Apr 2011 Posts: 11	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?

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. DIYChatroom.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any home improvement task!

06-05-2012, 12:01 AM	#2
clocert Member   Join Date: Oct 2010 Posts: 192	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 )

06-05-2012, 05:59 AM	#3
beenthere An old Tradesmen   Join Date: Oct 2008 Location: PA Posts: 18,635	Just a question... 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.

06-05-2012, 08:44 AM	#4
HVACDave Member   Join Date: Oct 2007 Location: Manitoba, Canada Posts: 260	Just a question... How are you performing the calculation? Are you remembering to use absolute values? If not, that can really throw off your result.

06-05-2012, 05:16 PM	#5
beenthere An old Tradesmen   Join Date: Oct 2008 Location: PA Posts: 18,635	Just a question... Need to add 14.7 to the gauge reading. or what ever your altitudes atmospheric pressure is.