4 Refrigerant Recovery and Cylinder Handling
Learn when and how refrigerant is recovered, how to handle recovery cylinders safely, and how recovery differs from evacuation and charging.
Purpose and limits of recovery
removes refrigerant from an appliance and stores it in an external container; it does not require cleaning or testing the refrigerant. Recovery is required before opening many systems for service, and intentional venting during service is generally prohibited under EPA Section 608.
Use equipment suited to the refrigerant and follow the recovery machine manufacturer’s instructions. Recovery, , and are distinct tasks.
Safe recovery procedure
Identify the refrigerant and hazards. Check the equipment label and service information. Confirm that the recovery machine, hoses, fittings, and cylinder are compatible with the refrigerant and its pressure. For flammable refrigerants, use equipment specifically approved for that refrigerant and follow its additional safety requirements.
Prepare the work area and equipment. Provide ventilation, keep ignition sources away where relevant, wear appropriate eye and hand protection, and inspect hoses and connections. Use certified recovery equipment where required. Do not use a vacuum pump to recover refrigerant.
Select and inspect the cylinder. Use an authorized, refillable —not a disposable cylinder—and verify that its pressure rating and condition are suitable. Do not use a cylinder with damage, a faulty valve, or an expired requalification. Unauthorized cylinders may not be safe or legal to transport when filled.
Prevent contamination and overfill. Keep different refrigerants separate, using a dedicated, clearly identified cylinder for each refrigerant. Put the cylinder on a scale before recovery begins. Follow the cylinder markings and the refrigerant-specific maximum fill weight; do not rely on pressure alone to estimate the fill level. A common training limit is liquid volume, but the applicable cylinder and refrigerant limits control. Do not bypass an .
Recover and verify. Connect the recovery setup as directed by its manufacturer, open the required valves, and recover using the specified method. Stop at the required endpoint for the appliance and service task. Watch cylinder weight and pressure throughout; stop if the cylinder reaches its limit or the equipment behaves abnormally. Close valves and disconnect carefully, minimizing refrigerant release.
Label and secure the cylinder. Identify the refrigerant and contents, close and protect the valve, and secure the cylinder against tipping. Store it in a suitable, well-ventilated place away from heat. Follow applicable transport requirements; compressed-gas guidance calls for securing cylinders and protecting valves during transport.
Recovery, , and
Recovery transfers refrigerant from the appliance into an external . It is not the same as using a vacuum pump to remove air or moisture.
uses a vacuum pump to remove air, moisture, and other from the appliance after refrigerant has been recovered. It is not a substitute for recovery. Required levels depend on appliance type, charge, age, and circumstances; consult current EPA service-practice requirements.
adds a measured quantity of the specified refrigerant to a prepared appliance. It is not recovery, and a is not a cylinder.
For example, before replacing a component, a technician recovers the system charge into a compatible, weighed . After repair, the technician evacuates the opened circuit with a vacuum pump, then charges the system with the specified refrigerant and quantity.
Handling recovered refrigerant
If recovered refrigerant is known or suspected to be mixed or contaminated, keep it segregated and arrange appropriate handling. Recovered refrigerant may generally be returned to the same owner’s equipment. Before it is sold or transferred to a different owner, EPA requires by an EPA-certified reclaimer.
Keep refrigerants separate, control cylinder fill by weight, and secure cylinders during storage and transport.