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Old 09-29-2012, 11:52 PM   #1
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typical head pressure?


Hello everyone, I have installed ICM 333 head pressure control on new frigidaire window a/c 25000 btu. r410a. the control module has adjustable head pressure from 150 psi to about 500 psi. Everything is working fine, I set the head pressure adjustment to about 350 psi.Just wanted to confirm what typical head pressure would be on a hot day. thanks, Jeff

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Old 09-30-2012, 04:59 AM   #2
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typical head pressure?


350 is plenty high for a R410A system. Not sure why your running it that high.

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Old 09-30-2012, 06:10 AM   #3
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typical head pressure?


Where do you think I should set it? thanks BEENTHERE.
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Old 09-30-2012, 06:17 AM   #4
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typical head pressure?


How high depends on application, as in if its being used for capacity reduction on a slightly over sized unit. or just as a low ambient control. Along with weather the motor is a sleeve bearing or ball baring motor.

290 is a good setting for units that you just want to operate in low outdoor ambient conditions.

Higher pressure settings( like the 350 your at now)can cause a lot of short cycling on sleeve bearing motors when the outdoor temp is below 80. its short cycling that can cause motor damage, along with too slow of a speed for the sleeve bearing trying to maintain that high head.
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Old 09-30-2012, 10:52 AM   #5
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typical head pressure?


Ya, it's being used to cool 1200 sq ft room during cool months here in Ohio. I've also installed crankcase heater. The control module actually does not cycle, it slows fan rpm after hard start to maintain head pressure. So 290 psi it is. Thank you Beenthere. for your reply. Jeff.
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Old 10-05-2012, 06:11 PM   #6
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typical head pressure?


o.k. The distributor called me back today, he has test pressures for units just like mine. typically on a 90 degree day the high side was 390 to 420 psi. the low side around 140.psi. Now my question is, do I try to maintain this pressure during cold weather?
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Old 10-05-2012, 06:37 PM   #7
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typical head pressure?


No, you don't need to simulate a 90 degree day.
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Old 10-05-2012, 06:41 PM   #8
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typical head pressure?


O.K. so i will set for 290 psi. Thanks. Jeff.

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