EPA 608 Practice exam Type 3| 50 Questions | Correct 100%

The maximum test pressure for leak testing a low-pressure centrifugal chiller is - ANSWER 10 psig Excessive operation of a purge system means - ANSWER The system has a leak on the sub-ambient pressure side of the system For a commercial refrigeration system with a charge of 50 pounds or more refrigerant, a substantial (or threshold) week rate will be reduced to ________ after January 1, 2019. - ANSWER 20% For a comfort cooling system with a charge of 50 pounds or more of refrigerant, a substantial (or threshold) Leak rate will be reduced to _________ after January 1, 2019. - ANSWER 10% According to the EPA, when all the R-123 liquid has been removed from an average 350 ton R-123 chiller and the system vapor pressure is 0 psig, the system contains - ANSWER 100 pounds of refrigerant in the system When working with low pressure systems, the high-pressure cut off should be set to no more than _________ to avoid damaging the system or activating the pressure blow off device (rupture disk). - ANSWER 10 psig The rupture discs on the low pressure chiller and on the recovery tank should relieve at __________ to prevent damage to the system during refrigerant transfer into or out of the system. - ANSWER 15 psig If possible, the temperature of the equipment room where the chiller is located - ANSWER Should be increased to speed recovery When possible, oil in the chiller should be heated because - ANSWER Less refrigerant will be soluble and/or trapped in the oil at higher temperatures To prevent freezing, when recharging an evacuated water cooled chiller system with R-123, first charge with a vapor 20 pressure of at least - ANSWER 20 in Hg vacuum When recharging a chiller, refrigerant is first added as a vapor followed by a liquid refrigerant to avoid - ANSWER Freezing of the water in the chiller barrels Replacing _________ is always considered a "major maintenance, service, or repair"? - ANSWER 1.)An evaporator 2.) condenser 3.)compressor