Leak Detection and Repair Flashcards

What should a technician do before pressurizing a system with nitrogen for a leak test?

Answer: Recover the existing refrigerant

Refrigerant should be recovered before pressure-testing with nitrogen.

A 'bubble solution' specifically designed for HVAC leak detection is preferred over household soap because it is:

Answer: Non-corrosive and produces longer-lasting bubbles

HVAC bubble solutions are non-corrosive and form stable, long-lasting bubbles.

When a leak is repaired but the follow-up verification fails, EPA generally requires the owner to:

Answer: Develop a plan to retrofit or retire the equipment

A failed follow-up verification requires a retrofit or retirement plan for the appliance.

Which part of a system is a common location for refrigerant leaks?

Answer: Flare fittings, valve stems, and brazed joints

Mechanical connections like flare fittings, valve stems, and joints are common leak points.

A technician notices the electronic detector alarms everywhere in a room. The best next step is to:

Answer: Ventilate the area and recheck once background vapor clears

High background vapor must be ventilated so the detector can isolate the actual leak.

Recordkeeping for leak repairs on a 50+ pound appliance must include which information?

Answer: The date, leak rate, and repair actions taken

Records must document the date, calculated leak rate, and the repairs performed.

Increasing system pressure with nitrogen above the test rating can cause what hazard?

Answer: Component rupture and personal injury

Over-pressurizing can rupture components and injure the technician.