Vent-Axia 1.5A Electronic Single Phase Speed Controller Installation and Wiring Instructions

Important Safety Information

Before installing or using the controller, please read these instructions carefully. This equipment must be earthed. The mains supply must be isolated before making any connections. All wiring must be in accordance with BS 7671:1992, current I.E.E wiring regulations, local building, and factory regulations in your country.

Mounting

The controller may be sited in any convenient position that is unaffected by direct heat sources such as radiators or boilers. Ensure the controller is installed in a ventilated area and that the enclosure is securely mounted using appropriate fixing screws or bolts. If the enclosure is mounted on a metal surface or partition, ensure that the surface is earthed.

Wiring Instructions

The installation must be provided with a double-pole isolator switch having a contact separation of not less than 3mm and must be protected with a 3 amp fuse. Ensure that the mains supply is isolated before proceeding. Remove the lid and connect the unit in accordance with the provided wiring diagrams. When using surface wiring that is not contained in conduit, the supply and output cables must be securely clipped to the mounting surface close to the controller.

Minimum Speed Adjustment

The control unit is factory set to Vent-Axia's recommended minimum speed. A minimum speed adjuster is located on the front of the controller and is exposed when the bottom slide bar is moved fully to the left. Using a small screwdriver, turn the adjuster clockwise to increase the minimum speed setting. After any adjustment, ensure the fan starts from a stationary condition by using the ON/OFF switch with the variable speed slide knob set fully to the left.

Notes on Running

Before switching on, check that the control unit and motor/fan are secure and that earth connections have been made. Switch on the mains and slide the control to maximum and down to minimum to ensure the motor/fan operates accordingly. If using automatic control via an electromechanical ON/OFF switched sensor (e.g., thermostat, timer, relay), ensure the sensor switch is adequately rated for the switched load.