Abstract: A plurality of solenoid control valves each mounted on a module of a manifold with a terminal block for each valve removably received in the manifold and having at least three terminals. A printed circuit board with a microprocessor and a coil driver mounted on the board has three spaced apart electric connectors releasably secured to separate terminals of the same terminal block and each having a shank received in a hole through the circuit board and electrically connected to a printed circuit on the board by solder to both mount and support the circuit board on the terminal block and provide output of the coil driver to the coils of two solenoids for controlling the application of electric power to them. An auxiliary circuit board with another coil driver and electric connectors mounted on another terminal block is daisy chained with the microprocessor for controlling the application of electric power to additional solenoid coils.