Daikin-McQuay 4021153 Circuit Board 318423-701 and the white wire is

and the white wire is normally open

while the maintainable design ensures the disc can be inspected or replaced without disturbing existing pipework

While designed for standard venting

The unit features an all-steel case and cover for maximum durability in mechanical rooms

Daikin-McQuay 4021153 Circuit Board 318423-701 and the white wire isThe Daikin McQuay 4021153 Circuit Board is a critical OEM replacement control board designed for high performance management of industrial and commercial HVAC systems. This Printed Circuit Board Assembly (PCBA) serves as the central processing hub, coordinating essential system parameters such as fan speed regulation, dehumidification cycles, and precise temperature setpoint maintenance. Engineered for seamless integration, the Daikin 4021153 is