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it triggers a shutdown if flue gases are not drafting correctly or if a heat exchanger failure occurs
this unit is designed to monitor positive
525 specification
This prevents heat exchanger damage caused by restricted airflow or blower failure
Trane VAL20518 Expansion Valve 30067439-890 it triggers a shutdown ifThe Trane VAL20518 Expansion Valve is a genuine OEM 3 ton thermostatic expansion valve (TXV) specifically engineered for residential and light commercial HVAC systems utilizing R22 refrigerant. As a critical component in the refrigeration cycle, this valve regulates the flow of refrigerant into the evaporator coil based on heat load, maintaining precise superheat control. For technicians replacing failing metering devices, the VAL20518 is the direct