Quote:
Originally Posted by brewtoo
I agree. But once the pressures equalize and the pump has lowered the pressure as far as it is able, can any more moisture be removed?
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The gauge commonly used for the low side are not accurate when the pressure almost reaches vacuum. There are special gauges for this purpose. They are quite pricey however. So in your case it could be that residual moisture is still boiling off without showing on your gauge. To make sure the system is ok I'd let the pump on for a longer time. After you have shut it off you can observe the gauge for some time (1 hour?) and see whether it says low (if yes -> add the refrigerant). If it moves a little bit and then stops, there is some residual moisture in the system (continue evacuation, maybe stronger pump is needed?). If it moves a lot, there is a leak (-> find and fix).
Bruno