Posted by Bob on March 26, 2013 at 19:48:57 from (64.255.159.192):
In Reply to: Refrigerant help posted by Fritz Maurer on March 26, 2013 at 19:01:21:
Best/CORRECT way would be to recover the refrigerant, then install the correct name plate amount. Need charging cylinder to do that.
That being said, the LOW SIDE pressure is what you want to be looking at to approximate a correct charge. Once the cooler has cooled down (still running, though), you should see a low side pressure in the 29 to 35 PSI range. As you begin to overcharge, low side pressure will go up and a line of condensation (or possibly frost) will appear on the compressor"s suction line and march towards the compressor as overchrage is increased.
The high side pressure IS important to look at to see if it is unusually high... could be from a dirty condensor, failed fan (if used), or impurities/air in the system
You mentioned installing line-piercing valves, you have just created several future leak points.
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