EPA 608 609 Type II High-Pressure Systems 2 — Questions and Answers
Question 1: Which refrigerant is most commonly associated with Type II high-pressure appliances?
- R-12
- R-22 (Correct answer)
- R-11
- R-123
Correct answer: R-22
R-22 is the classic high-pressure refrigerant covered under Type II certification.
Question 2: A high-pressure appliance with 50 lbs of charge that is not being disposed of must be repaired within how many days of a leak being detected?
- 10 days
- 30 days (Correct answer)
- 60 days
- 90 days
Correct answer: 30 days
Leaks on appliances with 50+ lbs of charge generally must be repaired within 30 days.
Question 3: Before opening a high-pressure system for service, the refrigerant should be recovered to what level for a system with an open compressor?
- 0 psig
- 10 inches of vacuum
- 4 inches of vacuum (Correct answer)
- 15 psig
Correct answer: 4 inches of vacuum
Open-drive compressors before 1993 require recovery to 4 inches of mercury vacuum.
Question 4: What is the required recovery vacuum level for a high-pressure appliance with more than 200 lbs of charge manufactured after November 15, 1993?
- 0 psig
- 10 inches Hg vacuum
- 15 inches Hg vacuum (Correct answer)
- 25 inches Hg vacuum
Correct answer: 15 inches Hg vacuum
Appliances over 200 lbs made after 1993 must be evacuated to 15 inches of mercury vacuum.
Question 5: Which device measures the depth of vacuum achieved during evacuation of a high-pressure system?
- Micron gauge (Correct answer)
- Compound gauge only
- Thermistor
- Ammeter
Correct answer: Micron gauge
A micron gauge accurately measures deep vacuum levels during evacuation.
Question 6: Non-condensable gases such as air in a high-pressure system primarily cause what problem?
- Lower head pressure
- Higher head pressure (Correct answer)
- Increased cooling capacity
- Lower compressor temperature
Correct answer: Higher head pressure
Air and other non-condensables raise head pressure and reduce efficiency.
Question 7: What color is the high-pressure (liquid line) side gauge on a typical manifold gauge set?
- Blue
- Yellow
- Red (Correct answer)
- Green
Correct answer: Red
The red gauge reads the high-pressure side of the system.
EPA 608 609 Type II High-Pressure Systems 2
Which refrigerant is most commonly associated with Type II high-pressure appliances?