EPA 608 Type 3 Exam With complete
solutions
On low pressure chillers, moisture typically enters the refrigerant system through -
correct Answers-air leaks from areas with gaskets or fittings
The maximum test pressure for leak testing a low pressure centrifugal is: - correct
Answers-10 psig
Leak test and repair the chiller to reduce refrigerant loss from a pruge unit on CFC-11
chiller - correct Answers-...
A hydrostatic tube test kit is used to: - correct Answers-determine if a tube leaks
Commercial and industrial process refrigeration systems must be repaired when the
leak rate exceeds ____ of the charge per year. - correct Answers-35%
Refrigerant recovery typically start with liquid recovery it is faster. - correct Answers-...
A rupture disc on a recovery vessel for a low pressure refrigerants relieves at: - correct
Answers-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. - correct Answers-2.5 mm Hg
The primary water source for a recovery unit condensing coil is _____. - correct
Answers-local municipal water supply
When recharging a refrigeration system with R-11, what vaporpressure is necessary in
the shells before changing with liquid? - correct Answers-16.9" Hg vacuum
After recovering the liquid refrigerant you must: - correct Answers-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. -
correct Answers-100 pounds
Charging refrigerant liquid into a refrigeration system when it is under a 29 inch Hg
vacuum can cause the: - correct Answers-system water to freeze
, A system does not have to be evacuated all the way to the required level when: -
correct Answers-leaks in the appliance make evacuation to the prescribed level
unattainable
Which of the foloowing repairs would ALWAYS be considered "major" under EPA's -
correct Answers-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? - correct Answers-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. - correct Answers-
25 mm of Hg absolute
After reaching the required recovery vacuum on a chiller, you should - correct Answers-
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 - correct Answers-20 inches of HG
vacuum
When evacuating a system the use of too large a vacuum pump can cause? - correct
Answers-trapped water to freeze
Refrigerant-11 at a pressure of 17 inches HG vacuum has a saturation temperature of: -
correct Answers-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 - correct
Answers-nitrogen
ASHRAE standard 15-1994 requires that each machinery room must activate an alarm
and mechanical ventilation beofre refrigerant concentrations exceed: - correct Answers-
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_______ - correct Answers-15 psi
Heat pumps that have been retrofitted from R22 to R407C should be leak checked with:
- correct Answers-pressurized nitrogen
When a new system has been assembled, the first thing to do is: - correct Answers-
pressurize the system with inert gas and leak check
solutions
On low pressure chillers, moisture typically enters the refrigerant system through -
correct Answers-air leaks from areas with gaskets or fittings
The maximum test pressure for leak testing a low pressure centrifugal is: - correct
Answers-10 psig
Leak test and repair the chiller to reduce refrigerant loss from a pruge unit on CFC-11
chiller - correct Answers-...
A hydrostatic tube test kit is used to: - correct Answers-determine if a tube leaks
Commercial and industrial process refrigeration systems must be repaired when the
leak rate exceeds ____ of the charge per year. - correct Answers-35%
Refrigerant recovery typically start with liquid recovery it is faster. - correct Answers-...
A rupture disc on a recovery vessel for a low pressure refrigerants relieves at: - correct
Answers-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. - correct Answers-2.5 mm Hg
The primary water source for a recovery unit condensing coil is _____. - correct
Answers-local municipal water supply
When recharging a refrigeration system with R-11, what vaporpressure is necessary in
the shells before changing with liquid? - correct Answers-16.9" Hg vacuum
After recovering the liquid refrigerant you must: - correct Answers-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. -
correct Answers-100 pounds
Charging refrigerant liquid into a refrigeration system when it is under a 29 inch Hg
vacuum can cause the: - correct Answers-system water to freeze
, A system does not have to be evacuated all the way to the required level when: -
correct Answers-leaks in the appliance make evacuation to the prescribed level
unattainable
Which of the foloowing repairs would ALWAYS be considered "major" under EPA's -
correct Answers-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? - correct Answers-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. - correct Answers-
25 mm of Hg absolute
After reaching the required recovery vacuum on a chiller, you should - correct Answers-
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 - correct Answers-20 inches of HG
vacuum
When evacuating a system the use of too large a vacuum pump can cause? - correct
Answers-trapped water to freeze
Refrigerant-11 at a pressure of 17 inches HG vacuum has a saturation temperature of: -
correct Answers-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 - correct
Answers-nitrogen
ASHRAE standard 15-1994 requires that each machinery room must activate an alarm
and mechanical ventilation beofre refrigerant concentrations exceed: - correct Answers-
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_______ - correct Answers-15 psi
Heat pumps that have been retrofitted from R22 to R407C should be leak checked with:
- correct Answers-pressurized nitrogen
When a new system has been assembled, the first thing to do is: - correct Answers-
pressurize the system with inert gas and leak check
