R-22
CHClF₂R-22 (chlorodifluoromethane, HCFC-22) is a hydrochlorofluorocarbon refrigerant widely used in residential and commercial air conditioning systems since the 1950s. As an HCFC compound, R-22 contributes to ozone layer depletion and has a Global Warming Potential (GWP) of 1,810. Under the Montreal Protocol and EPA regulations, R-22 production was phased out in the United States on January 1, 2020. While existing R-22 systems can continue to operate using recycled or reclaimed refrigerant, many facilities are transitioning to approved alternatives such as R-410A, R-407C, or newer low-GWP options. Leak detection for R-22 remains critical for regulatory compliance, preventing ozone-depleting emissions, and maintaining system efficiency in legacy HVAC equipment.
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Key Information
Essential safety and exposure information for R-22
Health Effects
- Inhalation of high concentrations can cause dizziness
- loss of coordination
- and asphyxiation. Can cause cardiac sensitization at high exposure levels.
Common Sources
- Legacy HVAC systems
- older commercial refrigeration
- retrofit applications
Exposure Limits
- OSHA PEL
- 1,000 ppm
- NIOSH REL
- 1,000 ppm (ST 1,250)
- ACGIH TLV
- 1,000 ppm
Regulatory Status
- EPA Classification
- Class II ODS (HCFC)
- ASHRAE Safety Group
- A1 (low toxicity, non-flammable)
- GWP (AR5)
- 1,810
- ODP
- 0.055
- Phase-out Status
- Production ended January 1, 2020
- Current Status
- Service-only using recycled or reclaimed refrigerant
Detection Requirements
- Sensor Technology
- Infrared (NDIR)
- Detection Range
- 0-1,000 ppm typical
- Response Time
- <30 seconds (T90)
- Calibration Frequency
- Annual recommended
- Cross-Sensitivity
- May respond to other halogenated refrigerants
Detection Solutions Coming Soon
We're working on adding related products and applications for R-22.