EPA 609 TECHNICIAN CERTIFICATION
TEST 2026/2027 BANK 400 QUESTIONS WITH
DETAILED VERIFIED ANSWERS / ALL
EXAM QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT
ANSWERS/ A+ GRADED
Why should refrigerant vapors or mist in high
concentrations not be inhaled? - ....ANSWER...They may
cause heart irregularities or unconsciousness
After refrigerant liquid has been recovered from the
appliance, any remaining vapor is; -
....ANSWER...Removed by the recovery system
An operating unit that has a receiver/storage tank requires
refrigerant system service. When servicing the unit... -
....ANSWER...Refrigerant should be pumped down to and
isolated in the receiver.
,Every refrigerating system must be protected by which of
the following? - ....ANSWER...A pressure relief device
How can you speed up the removal of the refrigerant
charge from a system? - ....ANSWER...Cooling the
recovery cylinder to lower its pressure.
How long must an HVAC servicing company keep records
for each disposed appliance with a charge between 5 and
50 pounds? - ....ANSWER...3 years
How long must owners and operators of regulated
appliances normally containing 50 or more pounds of
HCFC refrigerant keep records of leak inspections, initial
leak verification and follow-up verification tests? -
....ANSWER...3 years
Recovered refrigerant may contain which of the following
impurities? - ....ANSWER...Acids, moisture, and oil
What area of a refrigeration system does oil foaming
usually occur? - ....ANSWER...Compressor
,What can happen when using a large vacuum pump to
evacuate a system? - ....ANSWER...Water in system can
freeze
What is a deep vacuum usually measured in? -
....ANSWER...Microns
What is the best use for testing with soap bubbles? -
....ANSWER...To pinpoint refrigerant leaks
What is the primary water source for a water cooled
recovery unit's condensing coil? - ....ANSWER...Local
municipal water supply
What is the state of the refrigerant leaving the receiver in
a refrigeration system? - ....ANSWER...High pressure
liquid
What should be done after reaching the required recovery
vacuum on an appliance? - ....ANSWER...Wait for at least
a few minutes to see if the system pressure rises.
, Which leak repair category does the EPA define as air-
conditioning appliances used to provide cooling in order to
control heat and/or humidity in occupied facilities
including, but not limited to, residential, office, and
commercial buildings? - ....ANSWER...Comfort cooling
Which leak repair category does the EPA define as the
refrigeration appliances used in the retail food and cold
storage warehouse sectors? - ....ANSWER...Commercial
refrigeration
Which of the following CANNOT be used as a reason to
extend the appliance repair deadlines? - ....ANSWER...A
certified service technician is not available.
Which of the following is a reason to take an oil sample? -
....ANSWER...The unit has had a compressor burnout
Which of the following refrigerants would be used in a low-
pressure appliance? - ....ANSWER...R-123 (Freon)
TEST 2026/2027 BANK 400 QUESTIONS WITH
DETAILED VERIFIED ANSWERS / ALL
EXAM QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT
ANSWERS/ A+ GRADED
Why should refrigerant vapors or mist in high
concentrations not be inhaled? - ....ANSWER...They may
cause heart irregularities or unconsciousness
After refrigerant liquid has been recovered from the
appliance, any remaining vapor is; -
....ANSWER...Removed by the recovery system
An operating unit that has a receiver/storage tank requires
refrigerant system service. When servicing the unit... -
....ANSWER...Refrigerant should be pumped down to and
isolated in the receiver.
,Every refrigerating system must be protected by which of
the following? - ....ANSWER...A pressure relief device
How can you speed up the removal of the refrigerant
charge from a system? - ....ANSWER...Cooling the
recovery cylinder to lower its pressure.
How long must an HVAC servicing company keep records
for each disposed appliance with a charge between 5 and
50 pounds? - ....ANSWER...3 years
How long must owners and operators of regulated
appliances normally containing 50 or more pounds of
HCFC refrigerant keep records of leak inspections, initial
leak verification and follow-up verification tests? -
....ANSWER...3 years
Recovered refrigerant may contain which of the following
impurities? - ....ANSWER...Acids, moisture, and oil
What area of a refrigeration system does oil foaming
usually occur? - ....ANSWER...Compressor
,What can happen when using a large vacuum pump to
evacuate a system? - ....ANSWER...Water in system can
freeze
What is a deep vacuum usually measured in? -
....ANSWER...Microns
What is the best use for testing with soap bubbles? -
....ANSWER...To pinpoint refrigerant leaks
What is the primary water source for a water cooled
recovery unit's condensing coil? - ....ANSWER...Local
municipal water supply
What is the state of the refrigerant leaving the receiver in
a refrigeration system? - ....ANSWER...High pressure
liquid
What should be done after reaching the required recovery
vacuum on an appliance? - ....ANSWER...Wait for at least
a few minutes to see if the system pressure rises.
, Which leak repair category does the EPA define as air-
conditioning appliances used to provide cooling in order to
control heat and/or humidity in occupied facilities
including, but not limited to, residential, office, and
commercial buildings? - ....ANSWER...Comfort cooling
Which leak repair category does the EPA define as the
refrigeration appliances used in the retail food and cold
storage warehouse sectors? - ....ANSWER...Commercial
refrigeration
Which of the following CANNOT be used as a reason to
extend the appliance repair deadlines? - ....ANSWER...A
certified service technician is not available.
Which of the following is a reason to take an oil sample? -
....ANSWER...The unit has had a compressor burnout
Which of the following refrigerants would be used in a low-
pressure appliance? - ....ANSWER...R-123 (Freon)
