EPA 608 Type 2 certification Exam Questions with
Verified Answers .
After installing a new refrigeration system, what's the next step a technician
should take before charging the system? - (answers)Perform a leak check with
nitrogen.
Once the system is pressurized with nitrogen, what are the steps to take in order
to detect a leak? - (answers)First, you'll need an electronic or ultrasonic leak
detector. In order for these devices to detect a leak there needs to be a small
amount of some type of tracer gas, such as, refrigerant vapor or helium (both are
popular but, for the purpose of this exam stick with a refrigerant as your tracer
gas).
After the leak detector finds the general area of the leak, you can use a specially
formulated micro bubble solution to pinpoint the exact spot of the leak(s).
If a comfort cooling system contains 60lbs of refrigerant, is it required to have an
annual leak inspection? - (answers)Sort of a trick question...If it doesn't have a
leak above the leak rate threshold, then no. But, if it has been found to have a
leak exceeding the leak rate threshold, then yes. For comfort cooling, any system
with 50lbs and above is required to have an annual leak inspection (once per
calendar year) if it has exceeded the leak rate. Once it has proven to be lower
than the leak rate threshold for a full year, then the once per calendar year
inspections are no longer required.
What is the leak rate threshold a 75lbs comfort cooling system must not exceed in
order to prove it is operating within EPA regulations? - (answers)10%
, If a comfort cooling system with a refrigerant charge of 50lbs or higher has been
found to have a leak rate over 10% of the total system charge, it will be required
to have a leak test once per calendar year until the owner/operator can prove it is
not exceeding 10% for one full year.
What's an obvious visual indication of a leak? - (answers)Oil.
Oil will often get pushed out of the system with the leaking refrigerant. Inspect
equipment connections and piping for oil.
In a high pressure system that has a leak, will the superheat increase or decrease?
- (answers)Increase.
As more refrigerant leaks out of the system, there will be less refrigerant in the
evaporator. Less refrigerant in the evaporator means it will boil off sooner, thus
having more time to collect superheat.
If a comfort cooling appliance containing 50lbs or more refrigerant is found to
have a leak exceeding the 10% annual leak rate, how many days do you have
before it must be fixed? - (answers)30 days.
Concerning repaired leaks, does a technician need to do a pressure test with
nitrogen after every repair? - (answers)Yes.
Not only that, but a follow-up leak test must be performed within 10 days.
Verified Answers .
After installing a new refrigeration system, what's the next step a technician
should take before charging the system? - (answers)Perform a leak check with
nitrogen.
Once the system is pressurized with nitrogen, what are the steps to take in order
to detect a leak? - (answers)First, you'll need an electronic or ultrasonic leak
detector. In order for these devices to detect a leak there needs to be a small
amount of some type of tracer gas, such as, refrigerant vapor or helium (both are
popular but, for the purpose of this exam stick with a refrigerant as your tracer
gas).
After the leak detector finds the general area of the leak, you can use a specially
formulated micro bubble solution to pinpoint the exact spot of the leak(s).
If a comfort cooling system contains 60lbs of refrigerant, is it required to have an
annual leak inspection? - (answers)Sort of a trick question...If it doesn't have a
leak above the leak rate threshold, then no. But, if it has been found to have a
leak exceeding the leak rate threshold, then yes. For comfort cooling, any system
with 50lbs and above is required to have an annual leak inspection (once per
calendar year) if it has exceeded the leak rate. Once it has proven to be lower
than the leak rate threshold for a full year, then the once per calendar year
inspections are no longer required.
What is the leak rate threshold a 75lbs comfort cooling system must not exceed in
order to prove it is operating within EPA regulations? - (answers)10%
, If a comfort cooling system with a refrigerant charge of 50lbs or higher has been
found to have a leak rate over 10% of the total system charge, it will be required
to have a leak test once per calendar year until the owner/operator can prove it is
not exceeding 10% for one full year.
What's an obvious visual indication of a leak? - (answers)Oil.
Oil will often get pushed out of the system with the leaking refrigerant. Inspect
equipment connections and piping for oil.
In a high pressure system that has a leak, will the superheat increase or decrease?
- (answers)Increase.
As more refrigerant leaks out of the system, there will be less refrigerant in the
evaporator. Less refrigerant in the evaporator means it will boil off sooner, thus
having more time to collect superheat.
If a comfort cooling appliance containing 50lbs or more refrigerant is found to
have a leak exceeding the 10% annual leak rate, how many days do you have
before it must be fixed? - (answers)30 days.
Concerning repaired leaks, does a technician need to do a pressure test with
nitrogen after every repair? - (answers)Yes.
Not only that, but a follow-up leak test must be performed within 10 days.
