The Johnson Controls GM202-MH00 is a purpose-built A2L refrigerant detection sensor designed for modern HVAC and refrigeration systems using R454B — a low-GWP, mildly flammable (A2L class) refrigerant. Engineered for seamless integration into building automation and refrigeration monitoring systems, this sensor delivers reliable leak detection with a digital RS485 Modbus output for straightforward communication with compatible controllers and BAS platforms.
With a 24 V operating supply and a 2 ft cable terminated with a male connector, the GM202-MH00 is ready for quick, clean installation in equipment rooms, mechanical spaces, and refrigerated environments where R454B is in use. The Modbus RTU-compatible output simplifies wiring and network integration, making it an ideal choice for contractors and facility managers upgrading to next-generation refrigerants.
Key Features
- Designed specifically for A2L refrigerant detection — compatible with R454B
- RS485 Modbus digital output for easy BAS and controller integration
- 24 V operating voltage for compatibility with standard HVAC control circuits
- 2 ft cable with male connector for fast, secure field connections
- Compact sensor design suited for tight mechanical and refrigeration spaces
- Supports proactive leak detection to meet evolving A2L refrigerant safety requirements
Specifications
- Model: GM202-MH00
- Brand: Johnson Controls
- Target Refrigerant: R454B (A2L class)
- Output Type: RS485 Modbus
- Supply Voltage: 24 V
- Cable Length: 2 ft
- Connector: Male connector included
Applications
- Commercial refrigeration systems using R454B
- HVAC equipment rooms and mechanical spaces
- Building automation systems requiring Modbus-compatible refrigerant sensors
- Facilities transitioning to low-GWP A2L refrigerants
