EPA 608 CERTIFICATION LATEST UPDATE ACTUAL EXAM QUESTION AND ANSWERS
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Course
EPA 608 CERTIFICATION 2024-2025
Institution
EPA 608 CERTIFICATION 2024-2025
EPA 608 CERTIFICATION LATEST UPDATE ACTUAL EXAM QUESTION AND ANSWERS
How can you speed up the removal of the refrigerant charge from system?
Cooling the recovery cylinder to lower its pressure.
How long must an HVAC servicing company keep records for each disposed appliance with a charge betw...
How can you speed up the removal of the refrigerant charge from system?
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 lbs?
3 years (Both answers)
Recovered refrigerant may contain which of the following impurities?
Acids, Moisture, and Oil
What area of a refrigeration system does oil foaming usually occur?
Compressor
What is a deep vacuum usually measured in?
Microns
What is the primary water source for a water cooled recovery unit condensing
coil?
Local municipal water supply
What is the state of the refrigerant leaving the receiver in a refrigeration system?
High pressure liquid
What should be done after reaching the required recovery vacuum on an
appliance?
Wait for at least a few minutes to see if the system pressure rises.
Which of the following CANNOT be used as a reason to extend the appliance
repair deadlines?
A certified service technician is not available.
Which of the following refrigerants would be used in a low-pressure appliance?
R-123
,Which of the following repairs would always be considered "major" under EPA's
regulations?
Replacement of an Evaporator Coil
Which of the following should be replaced if a system is opened for servicing?
Filter Drier
Which of the following statements about recycling and recovery equipment used
for stationary refrigeration is FALSE?
Purchases of such equipment must be reported to the EPA.
Your recovery/recycling machine has R-22 refrigerant in it. you now have to
recover refrigerant from an R-410a unit. What must be done before recovery?
Remove the R-22 from the recovery unit and change filter.
Which refrigerant does NOT contain chlorine?
R-134a
Which refrigerant(s) must be recovered before opening or disposing of
appliances?
All three listed (HFC's, CFC's, HCFC's)
State and local governments may:
Establish laws that contain stricter requirements.
HFC refrigerants contain which of the following?
Hydrogen, Fluorine, Carbon (HFC)
How many ozone molecules can each chlorine atom in the stratosphere destroy?
1000,000 Molecules
Which type of refrigerant typically has the lowest global warming potential?
HFO's (Hydrofluoroolefin)
Which element of a CFC or HCFC molecule causes ozone depletion?
Chlorine
What characteristic(s) of CFC's and HCFC's make them more likely to reach the
stratosphere than most other compounds containing chlorine?
They do not dissolve in water or easily break down in ht atmosphere.
A major system repair is being performed on an R-22 appliance. What CANNOT
be done to service the appliance?
,Top off unit with R-410a
In which component of a system does the refrigerant change from a high-
pressure vapor to a high-pressure liquid?
Condensor
What must be done before disposing of any appliance containing a CFC,HCFC, or
HFC refrigerant?
Recover the refrigerant
Which process applies to cleaning refrigerant for immediate reuse by oil
separation and single or multiple passes through devices, like replaceable ore
filters driers, which reduce moisture and acidity?
Recycling
Which refrigerant does NOT contain chlorine?
R-134a
A hydrostatic tube test kit will;
Determine if a tube leaks
Charged low-pressure refrigeration machines may be most efficiently leak
checked by;
Adding heat with circulated hot water or heating blankets.
Refrigeration removal from a low-pressure system starts with:
Liquid Removal
Under what code group of standard 34 does R-123 fall?
B1
What is the leak rate threshold for industrial process refrigeration?
30%
What is the leak rate threshold for comfort cooling refrigeration?
10%
What is the leak rate threshold for commercial refrigeration?
20%
What is meant by the term "highly efficient purge unit"?
Purge units that discharge a low percentage of refrigerant with the air they remove.
, What is the result of raising the temperature of the room in which a low pressure
chiller is located?
Faster refrigeration recovery
What must be done after recovering the liquid refrigerant from low-pressure
chiller?
Recover the vapor refrigerant
What steps may be taken to prevent air accumulation into an idle low-pressure
refrigeration system?
Maintain system pressure slightly above atmospheric pressure.
When should an appliance NOT be evacuated all the way to the prescribed level?
When the leaks in the appliance make evacuation to the prescribed level unattainable.
Where should the discharge from a rupture disc be piped for venting?
Outdoors
Where would you place a leak detector probe to check gas leaks into the water
box with water removed?
In the Drain Valve opening
Which of the following is a reason to take an oil sample?
The unit has had a compressor blowout.
Which of the following safety precautions should be adhered to for low-pressure
systems?
Use gloves and safety goggles when working with liquid refrigerant.
Why do chillers using low-pressure refrigerants require purge units?
These systems operate below atmospheric pressure.
What synthetic lubricant is presently used with ternary blends containing
HCFC's?
Alkylbenzene
When transporting cylinders containing used refrigerant, DOT requires that you:
Attain DOT classifications tags
All appliances must be equipped with a service aperture or process stub which is
used when adding or removing refrigerant from the appliance. What is typically
used on small appliances?
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