Description
The Johnson Controls GM204-MH00 is a purpose-built A2L refrigerant leak detection sensor designed for use with R454A refrigerant. Engineered for modern HVAC and refrigeration systems transitioning to lower-GWP A2L refrigerants, this sensor provides reliable, continuous monitoring to help maintain safe operating environments and support regulatory compliance.
Equipped with an RS485 Modbus output, the GM204-MH00 integrates seamlessly into building automation systems and commercial refrigeration control networks, enabling real-time data communication and remote monitoring. The 24 V power supply requirement makes it compatible with standard low-voltage control circuits commonly found in commercial HVAC applications.
The sensor ships with a 2 ft cable terminated with a male connector, simplifying installation and ensuring a secure, reliable connection to the control panel or field wiring.
Key Features
- Designed for A2L refrigerant detection — compatible with R454A
- RS485 Modbus communication output for BAS and control system integration
- 24 V operating voltage — compatible with standard low-voltage HVAC circuits
- 2 ft cable with male connector included for easy field installation
- Supports safe refrigerant leak monitoring in commercial refrigeration environments
- Helps meet A2L refrigerant safety and code compliance requirements
Specifications
- SKU: GM204-MH00
- Brand: Johnson Controls
- Sensor Type: A2L Refrigerant Leak Detection
- Compatible Refrigerant: R454A
- Output Signal: RS485 Modbus
- Supply Voltage: 24 V
- Cable Length: 2 ft
- Connector: Male
Application
Ideal for commercial refrigeration systems, supermarket display cases, cold storage facilities, and any HVAC-R application utilizing R454A refrigerant. The Modbus RS485 interface allows the sensor to communicate with controllers, DDC panels, and building management systems for centralized leak monitoring and alarm management.
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