R-422D
R125/R134a/I…R-422D is an HFC refrigerant blend (R-125/R-134a/R-600a at 65.1/31.5/3.4%) designed as a drop-in retrofit replacement for R-22 in air conditioning systems. The isobutane (R-600a) content provides mineral oil compatibility, potentially eliminating lubricant changes during conversion. R-422D offers similar capacity to R-22 and has been widely adopted for residential and light commercial AC retrofit. With a GWP of 2,729, R-422D faces regulatory phase-down pressure. The zeotropic blend has significant temperature glide, requiring liquid charging to maintain proper composition. R-422D remains a popular choice where simple R-22 retrofit is needed without major system modifications.
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Key Information
Essential safety and exposure information for R-422D
Health Effects
Low toxicity classification. May cause cardiac sensitization. Contains trace flammable components.
Common Sources
- Residential and commercial AC
- medium temperature refrigeration
- heat pumps
Exposure Limits
- WEEL
- 1,000 ppm (8-hr TWA)
- No OSHA/NIOSH limit
- No OSHA/NIOSH limit
- Blend with R125/R134a
- Blend with R125/R134a
Regulatory Status
- EPA Classification
- HFC blend (non-ODS)
- ASHRAE Safety Group
- A1 (low toxicity, non-flammable)
- GWP (AR5)
- 2,729
- ODP
- 0
- Temperature Glide
- Approximately 5°C
- AIM Act
- Subject to phase-down
Detection Requirements
- Sensor Technology
- Infrared (NDIR)
- Detection Range
- 0-1,000 ppm typical
- Response Time
- <30 seconds (T90)
- Calibration Frequency
- Annual recommended
- Temperature Glide
- Significant; charge as liquid only
Detection Solutions
Sensors and detectors for R-422D monitoring
cGas Detector VRF IR Refrigerant Transmitter
An aesthetic, non-dispersive infrared refrigerant gas detector for acute leak detection in modern energy-efficient buildings utilizing Variable Refrigerant Flow (VRF) HVAC systems.
cGas-SC Self-Contained Controller
A self contained controller with up to 3 gas channels, Plug & Play Smart Sensor Technology and configurable logic control and priority settings. Offers superior user customization and reliable gas detection performance for monitoring many gases.
cGas Detector IR Refrigerant Transmitter
Non-dispersive infrared refrigerant gas detector with accurate, low level leak detection, available with analog output or BACnet® or Modbus® output and Plug & Play Smart Sensor Technology.
FCS Multi Channel System Controllers
High performance controller with logic and priority settings for monitoring toxic, combustible and refrigerant gases with versatile control functionality. Available with Modbus® or BACnet® communication with BAS, supports 4-20 mA and Modbus® driven VFDs.