HVAC Systems & Leak Detection Flashcards
7 cards from real CFC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 HVAC Systems & Leak Detection flashcards as text
Which leak detection method uses a flame that changes color in the presence of halogenated refrigerants?
Answer: Halide torch
A halide torch produces a blue-green flame color change when halogenated refrigerants (CFCs, HCFCs) are present in the air sample.
What is the minimum leak rate threshold that requires repair under EPA Section 608 for comfort cooling equipment containing 50 or more pounds of refrigerant?
Answer: 15% per year
EPA Section 608 requires repair when comfort cooling appliances with 50+ lbs of refrigerant leak at 15% or more of the charge per year.
In a split-system air conditioner, which component is most likely to cause refrigerant leaks due to vibration fatigue?
Answer: Copper refrigerant line near the compressor
Copper refrigerant lines near the compressor experience metal fatigue from compressor vibration, making them a common site for pinhole leaks.
When using an electronic leak detector, what action should a technician take first upon entering a suspected leak area?
Answer: Allow the detector to warm up and stabilize
Electronic detectors require a warm-up period to stabilize their sensors and provide accurate, reliable readings.
A technician finds the suction pressure lower than normal and the superheat higher than normal. Which condition is most likely?
Answer: Refrigerant undercharge due to leak
Low suction pressure combined with high superheat is a classic symptom of insufficient refrigerant, typically caused by a system leak.
What type of refrigerant circuit component is specifically designed to trap moisture and acid and should be replaced after any refrigerant leak event?
Answer: Filter drier
A filter drier absorbs moisture and acid; after a leak allows air/moisture entry, the saturated drier must be replaced to protect the system.
Under EPA regulations, which of the following refrigerants requires the LOWEST leak rate threshold before mandatory repair for industrial process refrigeration?
Answer: All ozone-depleting refrigerants have the same threshold
EPA Section 608 applies the same 35% annual leak rate threshold for industrial process refrigeration regardless of the specific ODS refrigerant.