EPA 608 Type 3 questions and solutions

EPA 608 Type 3 questions and solutions
On low pressure chillers, moisture typically enters the refrigerant system through - Correct
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Answer ✔✔ - air leaks from areas with gaskets or fittings
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The maximum test pressure for leak testing a low pressure centrifugal is: - Correct Answer ✔
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✔ - 10 psig by by by




Leak test and repair the chiller to reduce refrigerant loss from a pruge unit on CFC-11 chiller -
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Correct Answer ✔✔ - ...
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A hydrostatic tube test kit is used to: - Correct Answer ✔✔ - determine if a tube leaks
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Commercial and industrial process refrigeration systems must be repaired when the leak by by by by by by by by by by by




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




Correct Answer ✔✔ - 35F
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During the evacuation of a system containing large amounts of moisture you can prevent
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freezing of this moisture by increasing the pressure with______gas - Correct Answer ✔✔ -
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nitrogen
by




ASHRAE standard 15-1994 requires that each machinery room must activate an alarm and by by by by by by by by by by by by




mechanical ventilation beofre refrigerant concentrations exceed: - Correct Answer ✔✔ -
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the threshold limit valve and time weighted average
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The typical design burst pressure for a rupture disk on a low pressure centrifugal air-
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conditioning system is set at_______ - Correct Answer ✔✔ - 15 psi by by by by by by by by by by by by




Heat pumps that have been retrofitted from R22 to R407C should be leak checked with: -
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Correct Answer ✔✔ - pressurized nitrogen
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When a new system has been assembled, the first thing to do is: - Correct Answer ✔✔ -
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pressurize the system with inert gas and leak check
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EPA regulations require that leaking commercial or industrial process refrigeration
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equipment must be repaired when the leak rate exceeds______ of the charge per year. -
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Correct Answer ✔✔ - 35%
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