3 Refrigerant Recovery Procedures Free Online FlashCards

How should you identify the refrigerant before recovery?

Identify the refrigerant and charge from the appliance nameplate and service records; never mix refrigerants.

What recovery equipment is required for applicable stationary appliances?

Use recovery equipment rated for the appliance and refrigerant. Section 608 technicians must use certified recovery equipment for applicable stationary appliances.

Why manage the chiller’s water side during evacuation?

Manage the water side as directed by the manufacturer; circulating or removing water during evacuation can reduce the risk of freezing chiller tubes.

What makes a recovery cylinder suitable for a refrigerant?

Use a recovery cylinder approved for the refrigerant and rated for its pressure.

What should you check when setting up the recovery circuit?

Connect suitable hoses and the manifold or recovery unit to the chiller’s liquid and vapor service connections. Check hoses, fittings, and valves for leaks.

How should hoses be cleared without releasing refrigerant?

Clear or evacuate hoses using the equipment’s approved procedure; do not vent refrigerant.

Why is liquid generally recovered before vapor?

Recover bulk liquid first because a given volume of liquid contains much more refrigerant by mass than the same volume of vapor.

When may a push-pull method be used?

A push-pull method can transfer bulk liquid quickly when the system layout and equipment permit it; use only the manufacturer-specified valve arrangement.

What must you prevent when using a recovery unit?

Do not allow liquid refrigerant to enter a recovery unit that is not designed to handle liquid.

What is recovered after bulk liquid has been removed?

After bulk liquid is removed, recover the remaining vapor through the appropriate vapor connection.

What must be suitable for low-pressure chiller recovery?

For a low-pressure chiller, the recovery device’s high-pressure cut-out and other controls must be suitable for low-pressure service.

What evacuation level applies to low-pressure appliances?

The required evacuation level for low-pressure appliances is $25\ \mathrm{mm\ Hg}$ absolute, not a gauge-vacuum reading.