How often should the refrigeration oil in a compressor be changed?
What will be an ideal response?
Refrigeration oil does not need regular changing. Refrigeration oil is usually only changed to clean up a contaminated system or to add a retrofit refrigerant.
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Salamanders belong to the subphylum Amphibia
Indicate whether the statement is true or false
The roofing should be applied under a layer of asphalt-saturated building paper.
Answer the following statement true (T) or false (F)
According to the NLGI classification system, low numbers mean the grease is ________
A) Thick B) Thin
Oversized suction lines:
A) Can reduce system efficiency because of a high pressure drop. B) Can cause poor oil return because of low refrigerant velocity. C) Can reduce system efficiency because of a low pressure drop. D) Can cause poor oil return because of high refrigerant velocity.