EPA 608 2023/2024 UPDATED AND REVISED
FOR YOUR EXAM COMPLETED AND RATED A.
When dehydrating a system, it should be evacuated to a minimum level of
(blank) microns?
500.
before charging a new system with refrigerant, what should be done?
Pressurize with nitrogen (classified as an inert gas) and leak checked.
if switching from recovering one refrigerant to another, what steps must be
taken before recovering the new refrigerant?
Purge the recovery.
Recycle equipment by recovering as much of the 1st refrigerant as possible.
Evacuate.
Change the filter.
what problem can using large vacuum pumps lead to and how can a technician
prevent it?
Can cause trapped water to freeze.
During evacuation of systems with large amounts of water, it may be necessary to
increase pressure by introducing nitrogen to counteract freezing.
when should a low-pressure system be leak checked according to ASHRAR
guideline 3-1996?
When the system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum
testing.
what should be done if a leak makes reaching the required vacuum level
unattainable?
The system should be evacuated to the lowest attainable level before a major
repair.
where is the rupture disc on a low-pressure centrifugal system and where
should the disc be vented to?
, Location: On the evaporator.
Discharge from the disc should be vented outside.
under ASHRAE Standard 34, R-134a is classified as?
A-1.
what certification does a technician require in order repair a chiller operating
with R-22?
Type II certification.
what equipment should be used to test a tube?
Hydrostatic tube test kit.
which organization establishes the refrigerant safety group standard?
ASHRAE.
does refrigerant go out of the system in low pressure systems or does air and
moisture go in?
Air and moisture enter the refrigerant system because it operates in a vacuum.
how can a technician determine when it is safe to start charging with liquid
refrigerant?
Refrigerant saturation temperature reaches 36*F or the vapor pressure reaches
16.9" Hg vacuum.
what are ways you can increase the pressure in the system?
Heater blankets.
Controller hot water.
how can you speed up the vapor recovery process?
A heater on the recovery vessel side will help to evacuate the vapor faster.
the state of the refrigerant leaving the liquid receiver of a refrigeration system is
what?
High-pressure liquid.
can a hermetic compressor be operated when the system is in a deep vacuum?
FOR YOUR EXAM COMPLETED AND RATED A.
When dehydrating a system, it should be evacuated to a minimum level of
(blank) microns?
500.
before charging a new system with refrigerant, what should be done?
Pressurize with nitrogen (classified as an inert gas) and leak checked.
if switching from recovering one refrigerant to another, what steps must be
taken before recovering the new refrigerant?
Purge the recovery.
Recycle equipment by recovering as much of the 1st refrigerant as possible.
Evacuate.
Change the filter.
what problem can using large vacuum pumps lead to and how can a technician
prevent it?
Can cause trapped water to freeze.
During evacuation of systems with large amounts of water, it may be necessary to
increase pressure by introducing nitrogen to counteract freezing.
when should a low-pressure system be leak checked according to ASHRAR
guideline 3-1996?
When the system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum
testing.
what should be done if a leak makes reaching the required vacuum level
unattainable?
The system should be evacuated to the lowest attainable level before a major
repair.
where is the rupture disc on a low-pressure centrifugal system and where
should the disc be vented to?
, Location: On the evaporator.
Discharge from the disc should be vented outside.
under ASHRAE Standard 34, R-134a is classified as?
A-1.
what certification does a technician require in order repair a chiller operating
with R-22?
Type II certification.
what equipment should be used to test a tube?
Hydrostatic tube test kit.
which organization establishes the refrigerant safety group standard?
ASHRAE.
does refrigerant go out of the system in low pressure systems or does air and
moisture go in?
Air and moisture enter the refrigerant system because it operates in a vacuum.
how can a technician determine when it is safe to start charging with liquid
refrigerant?
Refrigerant saturation temperature reaches 36*F or the vapor pressure reaches
16.9" Hg vacuum.
what are ways you can increase the pressure in the system?
Heater blankets.
Controller hot water.
how can you speed up the vapor recovery process?
A heater on the recovery vessel side will help to evacuate the vapor faster.
the state of the refrigerant leaving the liquid receiver of a refrigeration system is
what?
High-pressure liquid.
can a hermetic compressor be operated when the system is in a deep vacuum?
