Leak Detection and Repair 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 Leak Detection and Repair flashcards as text
An electronic leak detector responds to which characteristic of refrigerant?
Answer: Its presence in the air near a leak
Electronic detectors sense refrigerant vapor concentration in the air near a leak.
What is the EPA annual leak rate trigger for industrial process refrigeration?
Answer: 30%
Industrial process refrigeration must be repaired when the annual leak rate exceeds 30%.
Before electronic leak detection, why should the area around suspected leaks be free of strong air currents?
Answer: Air currents disperse escaping refrigerant and cause false negatives
Drafts disperse the leaking vapor, making it harder for the detector to sense.
A halide torch leak detector indicates a refrigerant leak by changing what?
Answer: Flame color to green
A halide torch flame turns green when it contacts chlorinated refrigerant.
How often must comfort cooling appliances with leaks exceeding the trigger rate be checked under recordkeeping rules?
Answer: Documented and repaired within the required timeframe
Leaks must be documented and repaired within the EPA-required timeframe.
When using nitrogen to pressure-test, a technician should always do what to control the pressure?
Answer: Use a pressure regulator
A pressure regulator is required to keep nitrogen below the system's test pressure limit.
What is the primary advantage of fluorescent dye over a soap-bubble test for small, slow leaks?
Answer: Dye remains in the system and reveals intermittent or hidden leaks over time
Dye stays in the system and marks even slow or intermittent leaks for later UV inspection.