Industry Best Practices Flashcards

After repairing a leak on an appliance with 50 lb or more of refrigerant, which tests confirm the repair?

Answer: Initial and follow-up verification tests

EPA requires an initial verification test right after the repair and a follow-up verification test after the system returns to normal operation.

What is the maximum temperature a refrigerant cylinder should be exposed to?

Answer: 125°F

Above 125°F, liquid expansion and rising pressure can make a cylinder hydrostatically full and cause it to rupture.

What is the proper practice before disposing of a disposable (non-refillable) refrigerant cylinder?

Answer: Recover any remaining refrigerant to 0 psig, mark it empty, and render it unusable

Disposable cylinders must be emptied to 0 psig, marked empty, and never refilled.

Why should service valve caps be replaced after servicing?

Answer: They act as a secondary seal against leaks

Schrader cores and service valves can seep, and the capped seal is an important backup that prevents leaks.

How can a technician check a recovery cylinder for noncondensables?

Answer: Let it stabilize at a known temperature and compare its pressure to the PT chart

If pressure is higher than the PT chart shows for that temperature, noncondensables such as air are present.

When the system compressor is not operational, how should refrigerant be recovered?

Answer: From both the high and low sides

Without a running compressor to move refrigerant, recovering from both sides gets the refrigerant out faster and more completely.

Under EPA rules, how soon must a leak be repaired after a covered comfort-cooling appliance exceeds the allowable leak rate?

Answer: Within 30 days

Owners generally have 30 days to repair leaks once the leak-rate threshold is exceeded.