4 Refrigerant Safety and Proper Handling

Identify refrigerants and hazards

Refrigerants move heat through air-conditioning and refrigeration systems, but their hazards differ. A refrigerant may be under high pressure, displace oxygen, cause cold burns when liquid or rapidly expanding vapor contacts skin, or be flammable or toxic. Environmental effects may include ozone depletion or contribution to climate change. Identify the refrigerant and its hazards before beginning work; do not assume all refrigerants behave alike.

Check the equipment nameplate, cylinder label, and safety data sheet (SDS). Do not identify a refrigerant by cylinder color alone. Safety classifications distinguish toxicity and flammability: some refrigerants have low toxicity and no flame propagation under specified test conditions, while others are mildly flammable or more hazardous. Follow the equipment manufacturer’s instructions and the SDS for the specific refrigerant.

System pressure depends on the refrigerant and its temperature. A pressure reading alone does not measure charge or prove that a system is safe. Use hoses, gauges, recovery equipment, and cylinders with appropriate pressure ratings and refrigerant compatibility, and inspect them before use. Do not connect a cylinder or tool if its rating or compatibility is uncertain.

Work safely and respond to exposure

Before work, consult the refrigerant’s SDS, equipment instructions, and workplace procedures. Work in a well-ventilated area. Vapor can displace oxygen, especially in pits, machinery rooms, and other enclosed or low-lying spaces. Use required monitoring and ventilation; do not enter a potentially oxygen-deficient space without proper training and entry controls.

Keep ignition sources away when working with flammable refrigerants. Use tools and equipment suitable for the refrigerant’s hazard classification, and follow manufacturer instructions for ignition control. Wear safety glasses or goggles and gloves appropriate to the refrigerant and task. If liquid contact or splashing is possible, use protective clothing and face protection as indicated by the SDS and risk assessment. Liquid refrigerant can cause frostbite, and ordinary work gloves may not provide adequate protection.

Avoid breathing vapor, and do not rely on odor to detect a leak because some refrigerants have little or no warning odor. Never heat a refrigerant cylinder with a flame or expose it to excessive heat. Do not use oxygen or compressed air to pressure-test or flush refrigeration systems; use the method and gas specified by the manufacturer and applicable procedures.

If a significant release occurs, leave the affected area and keep others out. Do not re-enter until the area has been assessed as safe. Follow the site emergency plan and seek medical help for suspected frostbite, breathing difficulty, confusion, or other serious exposure. For skin contact with cold liquid, follow the SDS and workplace first-aid procedure; do not rub the affected area.

Find leaks and limit releases

Leaks can occur at service ports, fittings, brazed joints, valves, seals, coils, and damaged tubing. Clues may include unexpected loss of system performance, visible oil near a joint, leak-detector alarms, or repeated need to add refrigerant. These clues require investigation; none alone confirms a leak.

Use a detection method suitable for the refrigerant and equipment, such as an appropriate electronic detector or approved bubble solution. Check likely leak points systematically and follow the detector’s instructions. Never use a flame to search for leaks. Repair the cause rather than repeatedly adding refrigerant, and comply with applicable leak repair, inspection, recordkeeping, and reporting requirements.

Preventing releases, repairing leaks, and recovering refrigerant for appropriate reuse or reclamation can help reduce environmental impacts. Certain older refrigerants deplete stratospheric ozone, and many refrigerants, including some substitutes, can have high global-warming potential (GWP). EPA’s venting prohibition generally covers ozone-depleting refrigerants and their substitutes during service, repair, maintenance, or disposal of covered equipment.

Recover and manage refrigerant

EPA distinguishes three processes for handling refrigerant removed from equipment:

• Recover: Remove refrigerant from an appliance and store it in an external container, without necessarily processing it.

• Recycle: Clean recovered refrigerant for reuse, typically by removing oil and reducing moisture, acidity, or particulates. Under stationary-equipment rules, recycling generally means reuse in equipment owned by the same person.

• Reclaim: Reprocess refrigerant to the applicable purity standard and verify that it meets that standard. Refrigerant generally must be reclaimed by an EPA-certified reclaimer before it can be sold as reclaimed refrigerant.

Use recovery equipment approved for the refrigerant and application, and operate it as directed. Recover refrigerant before opening or disposing of equipment when required. Use a compatible, properly rated recovery cylinder. Keep refrigerants separated: do not mix them in a cylinder, and label the cylinder accurately. Weigh the cylinder during filling and never exceed its marked fill limit or applicable requirements. Close valves when not in use and check connections for leaks.

Recovered refrigerant is not automatically ready for reuse or sale. Determine whether it may be reused, must be recycled, or must be sent to an EPA-certified reclaimer under applicable rules. Do not vent refrigerant as a shortcut for servicing or emptying equipment.

Store and transport cylinders

Treat refrigerant cylinders as pressure vessels. Inspect them for damage, corrosion, leaks, and legible labels. Store them upright and secured against falling in a dry, well-ventilated location away from excessive heat and physical damage. Keep valve-protection caps in place when cylinders are not connected for use. Separate and identify full and empty cylinders, and keep valves closed when not in use.

For movement, use a suitable cylinder cart; do not drop, drag, or roll cylinders. Before transport, close the valve, disconnect equipment as appropriate, and install the protective cap unless a carrier designed for the purpose provides the required protection. Secure cylinders so they cannot shift or strike one another. Follow applicable U.S. Department of Transportation hazardous-materials requirements and employer procedures. Additional rules may apply to shipping, vehicle ventilation, quantity, and cylinder condition.

Meet certification and regulatory duties

For stationary air-conditioning and refrigeration equipment, Section 608 of the Clean Air Act generally requires EPA certification for technicians whose work could reasonably be expected to release refrigerant by violating the integrity of the refrigerant circuit. Certification types cover small appliances (Type I), high- or very-high-pressure appliances (Type II), low-pressure appliances (Type III), or all equipment (Universal). A closely and continually supervised apprentice may qualify for an exemption described by EPA. Technicians must also follow applicable service practices, recovery requirements, sales restrictions, leak rules, and recordkeeping obligations.

Motor-vehicle air-conditioning (MVAC) service is generally governed by Section 609. Technicians servicing MVAC systems for payment must meet applicable Section 609 training and certification requirements and use approved equipment. A Section 608 credential should not be assumed to replace Section 609 requirements for MVAC work.

Federal rules can change and may differ by equipment type, refrigerant, charge size, and activity. EPA has also established additional management requirements for certain HFCs and substitutes under the AIM Act. Employers, technicians, and equipment owners should check current EPA rules, OSHA requirements, DOT requirements, state and local rules, and the regulations applicable to the work. Certification does not replace safe work practices or employer training.