EPA 608 609 Type II 3 — Questions and Answers
Question 1: What is the recovery/evacuation requirement for a small high-pressure appliance containing less than 200 lbs with a non-operating compressor (post-1993 equipment)?
- 0 inches Hg vacuum
- 4 inches Hg vacuum (Correct answer)
- 10 inches Hg vacuum
- 15 inches Hg vacuum
Correct answer: 4 inches Hg vacuum
Appliances under 200 lbs with a non-operating compressor must be evacuated to 4 inches of mercury vacuum.
Question 2: Non-condensable gases such as air in a high-pressure system will cause what effect?
- Lower head pressure
- Higher than normal head pressure (Correct answer)
- No effect on operation
- Lower condensing temperature
Correct answer: Higher than normal head pressure
Air and other non-condensables raise head pressure and reduce system efficiency.
Question 3: When is the best time to check for non-condensables in a recovery cylinder?
- Immediately after recovery
- After the cylinder has stabilized at a known temperature (Correct answer)
- While the cylinder is being filled
- Never
Correct answer: After the cylinder has stabilized at a known temperature
Allowing the cylinder to reach a stable temperature lets you compare measured pressure to the refrigerant's saturation pressure.
Question 4: An appliance with a leak rate above the applicable threshold must be repaired rather than topped off if it contains how much refrigerant?
- 5 pounds or more
- 10 pounds or more
- 50 pounds or more (Correct answer)
- Any amount
Correct answer: 50 pounds or more
Appliances containing 50 or more pounds of refrigerant are subject to leak repair requirements.
Question 5: What does superheat measurement help a technician verify in a high-pressure system?
- Compressor amperage
- Proper refrigerant charge and evaporator performance (Correct answer)
- Oil acidity
- Leak location
Correct answer: Proper refrigerant charge and evaporator performance
Superheat readings indicate whether the evaporator is properly fed and the charge is correct.
Question 6: A filter-drier is installed in a high-pressure system primarily to do what?
- Increase refrigerant pressure
- Remove moisture and contaminants (Correct answer)
- Add oil to the system
- Measure superheat
Correct answer: Remove moisture and contaminants
Filter-driers capture moisture and particulate contaminants to protect the system.
Question 7: When recovering refrigerant into a cylinder, the cylinder should never be filled beyond what percentage of its capacity by weight?
- 50%
- 60%
- 80% (Correct answer)
- 95%
Correct answer: 80%
Recovery cylinders must not be filled beyond 80% to allow for liquid expansion.
EPA 608 609 Type II 3
What is the recovery/evacuation requirement for a small high-pressure appliance containing less than 200 lbs with a non-operating compressor (post-1993 equipment)?