3 Leak Detection, Repair, and Verification Free Online FlashCards

What is the reliable sequence for refrigerant leak service?

Use the sequence: inspect, locate, assess, repair, and verify.

What do oil residue and unusually high superheat indicate?

Oil or residue and unusually high superheat can suggest a leak, but neither alone confirms one or identifies its location.

How does bubble solution help locate a leak?

Apply an approved bubble solution to likely leak points and watch for bubbles that grow.

How should an electronic refrigerant detector be used?

Follow the detector’s instructions and move its probe slowly around joints and suspect areas.

What is the limitation of a pressure-decay test?

It can show that pressure is being lost, but it does not locate the leak. Pair it with a locating method.

What safety rules apply when pressure-testing with dry nitrogen?

Use a regulator and suitable test equipment, and never exceed the rated test pressure. Do not use oxygen or compressed air.

What should be confirmed before choosing a leak repair?

Confirm the refrigerant, system design, leak location, and extent of damage before selecting a repair.

What must a leak repair accomplish?

It must restore the pressure boundary, not merely hide the symptom.

What opening-pressure exception applies to certain high-pressure repairs?

Recover refrigerant as required and follow evacuation rules. For certain non-major repairs on high- or very-high-pressure appliances not followed by evacuation to the environment, EPA allows opening only at $0$ psig.

What sets the maximum pressure for a repair test?

Pressure-test the repaired section appropriately, keeping test pressure within the lowest applicable rating of the appliance and components.

When must initial verification occur?

Confirm the repaired location is leak-free after repair and before adding refrigerant back to the appliance or repaired section.

When and how is follow-up verification performed?

Recheck after the appliance returns to normal operating conditions, unless professional judgment indicates an earlier test would be more meaningful. Use a locating method at the repaired site.