Passage:
When servicing closed refrigeration circuits, technicians connect vacuum pumps to lower internal pressure below 500 microns before adding refrigerant. Lowering internal pressure depresses the boiling point of water, enabling trapped moisture to vaporize at ambient room temperatures and be drawn out through the exhaust. If refrigerant is added while liquid water remains inside, heat generated during normal operation causes the moisture to react with synthetic lubricants, forming corrosive acid compounds that break down the protective enamel on the motor windings.
Statement: Drawing a deep vacuum allows technicians to vaporize and extract trapped liquid moisture without heating the refrigeration equipment to water's normal atmospheric boiling temperature.
Cevap: Cevap