EPA 608 Type III Correct Questions & Answers(Rated A)

A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low pressure chiller is: - ANSWER C) 10 psig. A charged low pressure refrigeration system can be efficiently leak checked by: - ANSWER D) raising system pressure by heating with circulated hot water or heating blankets. The existence of air in a low pressure system, causes __________. - ANSWER C) high head pressure. Which safety precaution should be adhered to for low pressure systems? - ANSWER D) all of the above Refrigerant-11 at 14.7 PSIA will boil at about: - ANSWER B) 74.5F. When there is excessive moisture collecting in the purge unit of a low pressure refrigeration system, this indicates that the __________. - ANSWER B) the condenser or chiller barrel tubes are leaking. ASHRAE Standard 15 - 1994 requires equipment room refrigerant sensors for what safety group classification? - ANSWER D) All refrigerant safety groups When recharging a refrigeration system with R-11, what vapor pressure is necessary in the shells before charging with liquid? - ANSWER D) 16.9" Hg vacuum After reaching the required recovery vacuum on a chiller, you should: - ANSWER B) Wait for at least a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil. A hydrostatic tube test kit is used to: - ANSWER D) determine if a tube leaks. When charging a chiller, refrigerant vapor is introduced into the system before charging with liquid. This is because: - ANSWER D) Liquid charged into a deep vacuum will cause the refrigerant to boil and may lower temperatures enough to freeze the water in the tubes. When evacuating a system, the use of too large a vacuum pump can cause: - ANSWER A) trapped water to freeze. On a low-pressure chiller with an open-type compressor, the ________________ is very susceptible to leaks. - ANSWER B) shaft seal