608 Type 2 Study Guide With All Questions Answered

A {Ans: A crankcase heater is often used to prevent refrigerant from mixing with compressor oil during periods of: A. Low ambient temperature B. High ambient temperature C. Low humidity D. High humidity}D {Ans: A high-pressure appliance containing less than 200 lbs. of an HCFC or HFC refrigerant must be evacuated (recovered) to a level of; A. 15 inches of vacuum B. 10 inches of vacuum C. 4 inches of vacuum D. 0 inches of vacuum}18, refrigerant {Ans: The owner or operator has ______ months to retrofit or retire a leaking appliance if the replacement appliance will use a ______________ exempt from the venting prohibition.}inert gas, leak checked, leak detection, dry-nitrogen {Ans: After assembly and installation of a split-system, the unit should first be pressurized with an ___________, such as nitrogen (may also be referred to as dry-nitrogen), and __________________. When absolutely necessary, dry-nitrogen with a trace amount of the system's design refrigerant should be used for ________________. For example, an R-407C system should be leak checked with pressurized _________________ and a trace amount of R-407C.}November 15, 1993, 0, less, 0, 200, more, 10, 10, more, 15 {Ans: The required levels of evacuation during recovery