EPA 608 - TYPE 3 SAMPLE TEST QUESTIONS

EPA 608 - TYPE 3 SAMPLE TEST QUESTIONS Where do leaks commonly occur in low pressure systems? - correct answer-Gaskets or fittings Where do leaks commonly occur in open-drive type compressor systems? - correct answer-Shaft seal Does refrigerant go out of the system in low pressure systems or does air and moisture go in? - correct answer-Air and moisture enter the refrigeration system because it operates in a vacuum When should a low pressure system be leak checked according to ASHRAE guideline 3-1996? - correct answer-When the system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum testing What does a purge unit do and what is a high efficiency purge unit? - correct answer-Removes the air from the system. High efficiency purge system will expel very little refrigerant How does a centrifugal compressor purge unit work? - correct answer-Takes its suction from the top of the condenser, removes the air from the system, and returns the refrigerant to the evaporator What are visible ways to check for leaks in a low pressure system? - correct answer-All of the above What needs to be done to leak check a low pressure system? - correct answer-Increase the pressure in the system by the use of controlled hot water or heater blankets What are ways you can increase the pressure in the system? - correct answer-Controlled hot water and Heater blankets What can happen if you exceed 10 psig while pressurizing the system? - correct answer-The rupture disc will fail