The FR4 module is designed to drive up to four three-speed fans in parallel from a single thermostat or room controller. Individual relays with independent contacts are provided for the Three speeds of a typical fan-coil unit. This assures independent operation of the fans for a longer life expectancy.
Additional terminals are provided to drive also heating and cooling valves on all four fan-coil units in parallel.
Drive of upto 4 fan-coil units from a single thermostat or room controller
Multiplexing of both fan fan speed and valve control
3 Speed fan control
Power connection for next unit
Power supply connection for thermostat