Type III Flashcards
7 cards from real EPA 608 609 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Type III flashcards as text
When recovering refrigerant from a low-pressure appliance for major repair, the required recovery level depends on:
Answer: Whether recovery/recycling equipment was made before or after Nov 15, 1993
Required recovery vacuum levels differ for equipment manufactured before versus after November 15, 1993.
Recovery equipment manufactured after November 15, 1993, must evacuate a low-pressure appliance to:
Answer: 25 mm Hg absolute
Post-1993 recovery equipment must achieve 25 mm Hg absolute on low-pressure appliances.
A potentially dangerous condition when adding nitrogen to pressurize a low-pressure system for leak testing is exceeding:
Answer: 10 psig
Low-pressure appliances should not be pressurized above 10 psig, as higher pressures can cause a violent rupture.
To raise system pressure for leak detection in a low-pressure chiller, a technician may safely use:
Answer: Nitrogen with a trace of refrigerant, kept below 10 psig
A trace of refrigerant in nitrogen below 10 psig is used to detect leaks safely.
Why should oxygen never be used to pressurize a refrigeration system for leak testing?
Answer: It can react explosively with compressor oil
Oxygen can combine with oil and cause a violent explosion.
When pressurizing a low-pressure appliance for leak testing, the safest gas to use is:
Answer: Controlled amounts of nitrogen
Nitrogen is an inert gas safe for pressurizing systems.
Heating the refrigerant in a low-pressure appliance during recovery is used to:
Answer: Speed up recovery by raising vapor pressure
Gently warming the refrigerant raises its pressure, allowing faster and more complete recovery.