Refrigerant Leak Sensor System:
- Sensor Purpose:
- UL requirement for units using A2L refrigerant
- Detect the leakage of the refrigerant
- Installed in Air Handler unit (for split units)
- Who manufactures the R-454B Leak Detection Sensor used:
- Danfoss
- The sensors self-calibrate
- The sensor auto resets
- Sensors are calibrated to trip at 15% Lower Flammable Limit (LFL)
- The factory-provided sensor is only set up to detect R-454B
Mitigation Action in the Event of a Leak:
When the system detects a leak, the following mitigation actions will be initiated until the refrigerant has not been detected for at least 5 minutes.
- Disable Compressor Operation
- Disable Electric Heat
- Run the indoor supply fan to deliver a required minimum amount of circulation airflow
- Provide an output to energize Mechanical Room Ventilation (only binary output provision)
If the leak detection sensor has a fault, at the end of its life, or disconnected, the unit will initiate mitigation actions. Disconnecting the sensor may verify mitigation actions.
Location:
Connection Type:
- The leak detection sensor is a 6-pin plug. 2-pin 24Vac Power, 2-pin Modbus (not currently used), and a 2-pin contact.
Factory Installed wiring:
- 24Vac power
Replacement:
Alarm:
- Diagnostic: Refrigerant Concentration Sensor A (With Symbio Condenser)
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.