Carrier HK42FZ020 Control Board 320819-301 This is a factory drain

This is a factory drain hole required by ASME code

Since the flux is non-corrosive

Is this a direct fit for older American Standard units

Utilizing the Robertshaw 1751-721 ensures that the microamp signal from the sensor probe is accurately delivered to the module

Carrier HK42FZ020 Control Board 320819-301 This is a factory drainThe Carrier HK42FZ020 Control Board is a critical OEM replacement part designed for two stage gas furnace systems. This furnace circuit board serves as the central logic unit, managing the complex sequence of operations for high efficiency heating cycles. Engineered for Carrier, Bryant, and Payne equipment, it replaces previous iterations like the HK42FZ019, providing reliable control over the inducer motor, hot surface igniter, and blower motor