CFC HVAC Systems & Leak Detection 2

Question 1

Which leak detection method uses a flame that changes color in the presence of halogenated refrigerants?

Accepted Answer

Halide torch

Answer

A halide torch produces a blue-green flame color change when halogenated refrigerants (CFCs, HCFCs) are present in the air sample.

Question 2

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?

Accepted Answer

15% per year

Answer

EPA Section 608 requires repair when comfort cooling appliances with 50+ lbs of refrigerant leak at 15% or more of the charge per year.

Question 3

In a split-system air conditioner, which component is most likely to cause refrigerant leaks due to vibration fatigue?

Accepted Answer

Copper refrigerant line near the compressor

Answer

Copper refrigerant lines near the compressor experience metal fatigue from compressor vibration, making them a common site for pinhole leaks.

Question 4

When using an electronic leak detector, what action should a technician take first upon entering a suspected leak area?

Accepted Answer

Allow the detector to warm up and stabilize

Answer

Electronic detectors require a warm-up period to stabilize their sensors and provide accurate, reliable readings.

Question 5

A technician finds the suction pressure lower than normal and the superheat higher than normal. Which condition is most likely?

Accepted Answer

Refrigerant undercharge due to leak

Answer

Low suction pressure combined with high superheat is a classic symptom of insufficient refrigerant, typically caused by a system leak.

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC HVAC Systems & Leak Detection 2