R-427A
R32/R125/R14…R-427A is an HFC refrigerant blend (R-32/R-125/R-143a/R-134a at 15/25/10/50%) developed as an alternative to R-22 for air conditioning and heat pump applications. The four-component blend offers performance characteristics similar to R-22 with reasonable environmental improvement. R-427A requires POE lubricant change during retrofit. With a GWP of 2,138, R-427A is subject to phase-down regulations but offers moderate improvement over some alternatives. The blend has found use in commercial AC systems and heat pumps where R-22 replacement is required. Temperature glide is moderate, requiring attention to charging procedures.
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Key Information
Essential safety and exposure information for R-427A
Health Effects
Low acute toxicity. May cause cardiac sensitization at high concentrations. Ensure adequate ventilation.
Common Sources
- Commercial HVAC
- refrigeration systems
- R-22 retrofits
Exposure Limits
- WEEL
- 1,000 ppm (8-hr TWA)
- No OSHA/NIOSH limit
- No OSHA/NIOSH limit
- Blend with R32/R125
- Blend with R32/R125
Regulatory Status
- EPA Classification
- HFC blend (non-ODS)
- ASHRAE Safety Group
- A1 (low toxicity, non-flammable)
- GWP (AR5)
- 2,138
- ODP
- 0
- AIM Act
- Subject to phase-down
- Use Case
- R-22 alternative for AC and heat pump applications
Detection Requirements
- Sensor Technology
- Infrared (NDIR)
- Detection Range
- 0-1,000 ppm typical
- Response Time
- <30 seconds (T90)
- Calibration Frequency
- Annual recommended
- Four-Component Blend
- May show varied response to different components
Detection Solutions Coming Soon
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