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04-05-2010, 07:48 PM #1
Re: Charging 404A into a new walk-in freezer
Dry Nitrogen. Found 2 leaks (phos brazed joints where I couldn't see - rookie mistakes). Repaired. Soap tested all joints again. Pressurized to 140 psi using nitrogen and the gage held there for 3 days. If the sun was on the compressor unit the pressure rose to 148psi. Cooled at night - pressure back to 140.
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