Trane BRD4939 Circuit Board Freon Using it with other refrigerants

Using it with other refrigerants will lead to incorrect superheat and potential system failure

leading to potential vacuum leaks

or a "clicking" sound without actual arc formation

this input board is designed as the primary service part for legacy Barber Colman systems requiring the 021-0474 or KEL021-0247 specifications

High Load Capacity: Supports up to 600

Trane BRD4939 Circuit Board Freon Using it with other refrigerantsThe Trane BRD4939 Circuit Board is a critical OEM HVAC control board engineered to manage the sequence of operations for VariTrane and VariTrac VAV (Variable Air Volume) units. As a high performance direct replacement for BRD3564 and X13690252 07, this VAV UCM 4. 2 board processes thermostat inputs and sensor data to regulate fan speeds, blower cycles, and compressor activity. Field technicians prioritize the BRD4939 for its precision in executing