AC just can't manage florida heat
Posted 02 August 2011 - 07:31 PM
Posted 02 August 2011 - 08:56 PM
Edited by applianceman18007260692, 02 August 2011 - 08:57 PM.
-old Irish saying
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Posted 02 August 2011 - 09:14 PM
Posted 02 August 2011 - 09:41 PM
SAY WHAT?? HUH?? What you talkin' ' bout Willis???
75 PSI has it lugging.
Suction pressure of 74# is normal for a 75 degree air temp . No problems there.
R22 pressures low side 74, high side 210
Head pressure of 210 is low if it was hot outside, and I can guess it was really hot outside like in the 90's.
Here are some general rules of thumb for R-22.
At 95 degrees outside you will see somewhere around 275 # head pressure. maybe just a bit lower for a higher efficicancy unit.
Suction pressure often mimics the entering air temperature . If you have 75 degrees entering air temp , your suction pressure will likely be somewhere near 75# psi. Weird but often true.
You need to confirm what type of metering device you have. If you have a piston or cap tube metering device , you may have a " Partial No Pump " compressor. The symptoms are low head pressure (in relation to the outside temp),along with a higher than expected suction pressure ( in relation to the inside temp)
If you have a TXV (thermostaic expansion valve) , you may be simply low on refrigerant. With txv's you can have a high suction pressure when you are low on charge. One indicator of low charge is low head pressure . I would expect to see higher pressure than 210 when it is very warm outside .
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