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Old 08-02-2020, 10:26 PM   #1
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2004 Workhorse W22 air conditioner operating pressures

Anybody out there have any recommended operating pressures for the air conditioner in a 2004 W22 or similar air conditioner?

It's an R-134A system so I'm guessing 30-40 psi on the low side and 230 psi on the high side at 90 ambient but I'm wondering if the manual gives any recommendations. These pressures are probably a bit low but I don't want to run the pressures too high until I know what it is designed for.

I don't have a recovery system otherwise I'd recover it and put a factory load in it.

Also in my testing I noticed that it does not equalize very fast after shut down which could indicate a restriction however it cools reasonably well and the pressures are as noted above so I don't think it is restricted much, if at all. There might be solenoid valves in the compressor that slow or stop the equalization - I'm just use to seeing a lot faster equalization at shut down.

Thanks-
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Old 08-04-2020, 08:17 AM   #2
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Refer to the chart found here: R134a Pressure Chart

It is applicable to all R134a systems.
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