Firstco 9-CB500 3-Speed Fan Coil Control Board Circuit Board

The Firstco 9-CB500 is a 3-speed control board (circuit board) for fan coil and air handler units. It sits between the thermostat and the fan motor. This lets a low-voltage thermostat control a line-voltage multi-speed fan motor, which the thermostat can't do on its own because of its amperage and voltage limits.

Key Features:

• Provides three selectable fan motor speeds for airflow and comfort control
• Supports 24V 3-speed fan operation from a 3-speed wall-mounted thermostat
• Matches fan output to the actual heating or cooling load, which can reduce energy use and give quieter operation
• Replacement part for First Company fan coil systems, including HBC series motor applications
• Used in First Company fan coil units, where the CB500 board is described with conformal coating on both sides for humidity and condensation protection

Installation should be done by a qualified HVAC technician. Disconnect power first, label all wiring before removal, and reconnect each wire to the matching terminal on the new board.