3 Refrigerant Recovery Procedures Free Online FlashCards

What does refrigerant recovery do?

Recovery removes refrigerant from an appliance and stores it in an external container; it does not necessarily clean or purify the refrigerant.

What does Section 608 prohibit during stationary-system service?

Section 608 prohibits intentional venting during stationary air-conditioning and refrigeration service in the United States.

What must guide the choice and use of recovery equipment?

Use equipment approved for the refrigerant, and follow the recovery-machine manufacturer’s instructions and applicable regulations.

How should cylinders be assigned when recovering different refrigerants?

Use a separate, properly identified cylinder for each refrigerant; do not mix refrigerants.

What should you do if liquid entering the recovery machine causes knocking?

Throttle the inlet as the machine manual directs if liquid causes knocking; liquid slugging can damage the compressor.

What is vapor recovery used for after accessible liquid is removed?

Vapor recovery removes refrigerant as a gas and is generally used to clear refrigerant remaining after accessible liquid has been recovered.

In what order should refrigerant usually be recovered from a normally charged system?

For a normally charged system, recover accessible liquid first when equipment and connections allow, then recover vapor.

What evacuation levels apply to high-pressure appliances charged with 200 pounds or more?

For appliances containing more than 5 pounds, high-pressure systems charged with 200 pounds or more require 4 in. Hg vacuum with pre-November 15, 1993 equipment, or 10 in. Hg with equipment made on or after that date.

Why must a recovery cylinder be weighed during recovery?

Weigh the cylinder throughout recovery and never exceed its marked fill limit. Liquid refrigerant expands as it warms.

What is the main advantage of direct liquid recovery?

Direct liquid recovery removes refrigerant through an appropriate liquid-side connection and can greatly shorten recovery time. Control flow, then continue with vapor recovery.

What does liquid push-pull transfer, and what does it leave behind?

Liquid push-pull uses pressure and a siphon effect to transfer accessible bulk liquid to the cylinder. It is not suitable for every system and does not remove remaining vapor.

How should recovery be approached when a system has low charge or pressure?

Recovery may be slow. Check for restrictions or leaks and use only manufacturer-approved methods to improve heat transfer or recovery rate; never use an open flame or vent refrigerant.