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Key Benefits Precise LP Gas Control: Specifically calibrated for Liquid Propane systems to ensure a stable
Due to the spring-return design
Common Questions Is the HH22QC074 compatible with older HH22UC034 systems
When replacing a faulty SPDT relay in Aaon equipment
The switch closes (turns the fan on) when it senses a rise to 135°F and opens (turns the fan off) after a 30°F drop from that setpoint
Trane CNT2938 Defrost Board 30067439-890 Key Benefits Precise LP GasThe Trane CNT2938 Defrost Board (also identified as CNT02938) is a critical 24V microprocessor based control designed specifically for Trane and American Standard heat pump systems. Field technicians recognize this as the primary logic center for managing defrost cycles, preventing excessive ice buildup on the outdoor coil during low ambient operation. Unlike generic timers, this OEM Trane replacement part utilizes both ambient and coil temperature