EPA 608 TYPE 1 ,TYPE 2 AND TYPE 3 LATEST ACTUAL EXAM
QUESTIONS AND CORRECT DETAILED ANSWERS
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
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 faste: ...
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
R-410A requires recovery tanks rated for at least: - ANSWER: 400 psig
QUESTIONS AND CORRECT DETAILED ANSWERS
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
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 faste: ...
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
R-410A requires recovery tanks rated for at least: - ANSWER: 400 psig
