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Old 08-20-2012, 08:16 AM   #15
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Do the old Armstrong units have high and low Schrader valves?
Only low, which is usually at the back end of the AC.

A proper working roof AC, should kick up the high pressure, to 4 times the low pressure.

As an example, if the low is 70 psi, the high should be 280 psi.

A good indication of a worn out compressor is when the 4 times, starts dropping, to even 3 times.

That's a positive indicator that the compressor is worn out.

Compressors don't last forever.

Andy
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Old 08-20-2012, 10:51 AM   #16
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Thanks for the info, Andy and everybody. I really don't understand AC repair, and would therefore not attempt it myself.

For example, how do they test the high pressure to calculate the ratio if there's no valve. Is there some other way of knowing the high pressure?
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Old 08-20-2012, 10:54 AM   #17
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Thanks for the info, Andy and everybody. I really don't understand AC repair, and would therefore not attempt it myself.

For example, how do they test the high pressure to calculate the ratio if there's no valve. Is there some other way of knowing the high pressure?
The only way you can know the pressures, is by a meter.

Tapping into a line, is therefore a must.

Andy
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Old 10-05-2012, 04:35 PM   #18
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I was in the appliance service business for 30 years. Learned long ago that unless you can hear the leak, you will spend more time looking for it than the unit is worth. That's why we would just add gas and tell the customer if it continued to work, great but if it went down again, it was time to replace the unit. Warranty? Yes. Terms? Good till the dust settled in the driveway! That was in the days when we would dump the charge into the air
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