Residential HVAC Installation Questions and Answers | New One | Grade A+
Clearance tolerances are such that the ordinary clean refrigerant oil can be used satisfactorily in a vacuum pump. Ans: false The maximum recommended pressure for leak testing is 150 psig on the low-pressure side of the system. Ans: true Noncondensable gases ____. Ans: are undesirable in a refrigeration system To pull a vacuum means to ____. Ans: lower the pressure in a refrigeration system below atmospheric A(n) _ pressure could also mean refrigerant vapor is still seeping from the refrigeration system. Ans: high-rising A deep vacuum involves reducing the pressure in a refrigeration system to a micron gauge reading of _ or below. Ans: 500 or below. Micron gauge displays can be electronic analog, digital, or _. Ans: light emitting A multiple evacuation means that ____. Ans: you pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure To insure accurate testing, the best material to use for connecting lines to the vacuum pump and gauge set is ____. Ans: copper tube The oil in a vacuum pump should be changed after each time it is used. Ans: true There are _ microns in 1 mm Hg. Ans: 1,000 Air entering a refrigerant system can eventually lead to compressor failure. Ans: tru
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