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Old 07-17-2003, 07:25 PM   #1
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Original A/C Pressure

I have a 27' Overlander International with it's original A/C. It works very well to be 32 years old and only cleaned by myself for it's last 8 years of life. I was wondering what the low and high side freon pressure should be if fully charged? I'm guessing it's R-12 which I have and have horded for 10 years. Any other "care" tips I need to know about? I've lubed the fan motor and cleaned the evaporatorand condensor coils several times. I've reinforced the shroud with fiberglass and repainted it with Imron, fabricated new screens and replaced all the hardware with stainless steel fasteners.

Dave Spann, Lake Charles, La.
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Old 07-17-2003, 07:48 PM   #2
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Dave,

It is actually R22.

You have done all the right things. The Manual I have says you need to weigh the inbound freon. Weight of the freon after evac is on a rating plate in the unit.

It does not state head pressures.

If you have been hording R12 you have a small goldmine!
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Old 07-17-2003, 07:49 PM   #3
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First question, is it cooling correctly?

If so don't mess with it, just putting a set of guages on it will cause a loss of charge, they only hold around 17 ounces of freon. They use R-22 so save your R-12 for something else. According to my Armstrong manual at 95 degrees outside ambient temp suction pressure should be 74 psi, air off of condenser should be 106 degrees and air off evaporator should be 61 degrees. This is a very good manual, if you would like a copy of it in it's entirety I could fax it to you, a lot of very detailed service instructions included. Just send me a pm if so.

Chas
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