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EPA 608 EXAM QUESTIONS AND ANSWERS
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EPA 608 EXAM QUESTIONS AND ANSWERS
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EPA 608 EXAM QUESTIONS ANDANSWERS
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
ASHRAE standard 15-1994 requires that each machinery room must activate an alarm
and mechanical ventilation beofre refrigerant concentrations exceed: - Answer-the
threshold limit valve and time weighted average
The typical design burst pressure for a rupture disk on a low pressure centrifugal air-
conditioning system is set at_______ - Answer-15 psi
Heat pumps that have been retrofitted from R22 to R407C should be leak checked with:
- Answer-pressurized nitrogen
When a new system has been assembled, the first thing to do is: - Answer-pressurize
the system with inert gas and leak check
EPA regulations require that leaking commercial or industrial process refrigeration
equipment must be repaired when the leak rate exceeds______ of the charge per year.
- Answer-35%
Prior to replacing the condenser coil in a high pressure system, the refrigerant was
recovered and stored in a refillable container. The refrigerant: - Answer-can probably be
charged back into the system
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