| HVAC: Chiller Maintenance |
From "Trade School"
episode DTRS-212 |
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(Continued from page )
Utilizing the low pressure now in the chiller, he siphons the oil from the collection drums back into the chiller. When the oil is completely returned, Patrick lets the vacuum pump run over night.
The next day, the chiller is again in a deep vacuum. After disconnecting the vacuum pump. Patrick connects a vacuum gauge to the chiller and lets it sit for several hours. The vacuum gauge measures even the slightest change in pressure, acting as a secondary leak test. With the vacuum gauge showing no change in pressure, Patrick is free to return the refrigerant from the RCS to the chiller. He first transfers a small amount of vapor into the chiller because transferring liquid first would cause the water tubes in the chiller to freeze at the currently low pressure. Once the pressure is high enough, Patrick finishes by transferring the liquid and then the remaining vapor back into the chiller. A successful start-up confirms a job well done. In the next segment, we share some tips for the upkeep of your home air conditioning unit.
RESOURCES :
Chiller System Services Inc.
1510 Swadley St.
Lakewood, CO 80215
Telephone: 1-303-275-6250
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