EPA 608 Type 3 Correct Questions & Answers(Rated A)

On low pressure chillers, moisture typically enters the refrigerant system through - ANSWER air leaks from areas with gaskets or fittings The maximum test pressure for leak testing a low pressure centrifugal is: - ANSWER 10 psig Leak test and repair the chiller to reduce refrigerant loss from a pruge unit on CFC-11 chiller - ANSWER ... A hydrostatic tube test kit is used to: - ANSWER determine if a tube leaks Commercial and industrial process refrigeration systems must be repaired when the leak rate exceeds ____ of the charge per year. - ANSWER 35% Refrigerant recovery typically start with liquid recovery it is faster. - ANSWER ... A rupture disc on a recovery vessel for a low pressure refrigerants relieves at: - ANSWER 15 psig According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above ____ during a standing vacuum test, the system should be checked for leaks. - ANSWER 2.5 mm Hg The primary water source for a recovery unit condensing coil is _____. - ANSWER local municipal water supply When recharging a refrigeration system with R-11, what vaporpressure is necessary in the shells before changing with liquid? - ANSWER 16.9" Hg vacuum After recovering the liquid refrigerant you must: - ANSWER recover the vapor refrigerant According to the EPA there is approximately _____ refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed. - ANSWER 100 pounds Charging refrigerant liquid into a refrigeration system when it is under a 29 inch Hg vacuum can cause the: - ANSWER system water to freeze A system does not have to be evacuated all the way to the required level when: - ANSWER leaks in the appliance make evacuation to the prescribed level unattainable Which of the foloowing repairs would ALWAYS be considered "major" under EPA's - ANSWER replacement of evaporator coil Under EPA's regulation's _______ is used to pressurize a low pressure chiller for the purpose of opening the system for a non major repair? - ANSWER warming the refrigerant If you are using a recovery machine manufactored AFTER 11-15-93 you must evacuate an low pressure appliance to _______ before making a major repair. - ANSWER 25 mm of Hg absolute After reaching the required recovery vacuum on a chiller, you should - ANSWER Wait for at least a few minutes to see if the system pressure rises, indicating that there is till refrigerant in a liquid form or in the oil The pressure corresponding to 32 F for R-123 - ANSWER 20 inches of HG vacuum When evacuating a system the use of too large a vacuum pump can cause? - ANSWER trapped water to freeze Refrigerant-11 at a pressure of 17 inches HG vacuum has a saturation temperature of: - ANSWER 35F During the evacuation of a system containing large amounts of moisture you can prevent freezing of this moisture by increasing the pressure with______gas - ANSWER nitrogen