EFSC-TK • Electronic fan speed controllers with thermal contacts

See Downloads for Installation & Operation Manuals for further information.

Select correct wiring diagram for the fan and controller supplied. All wiring and control equipment MUST comply with the latest IEE

regulations, in particular 552-01-02/03. In the event that the wiring connections for the fan supplied do not correspond to diagrams shown, please refer to the fan instructions.

OPERATION Switch on the controller by operating the ON/OFF rocker switch (plus the Reset button for ‘T’ Versions). Rotating the Control Knob clockwise will increase the speed of the fan(s) from a pre-set minimum (see below) to full speed (with infinitely variable speeds in between). WARNING! Only a suitably qualified and competent person may carry out adjustment of the pre-set min and max speed control settings after the electrical supply has been isolated. MINIMUM SPEED CONTROL SETTING On certain fan types the factory set minimum speed might require adjustment. To adjust the minimum speed rotate the control knob on the front fully anti-clockwise. This is the current minimum speed position. Turn the minimum speed potentiometer inside the unit clockwise to increase the minimum speed setting and turn anti-clockwise to decrease the minimum speed setting. The fan will not fall below this pre-set speed during operation regardless of the front panel Control Knob setting. The minimum setting should not be less than 100V to ensure that the motor starts. MAXIMUM SPEED CONTROL SETTING To adjust the maximum speed rotate the control knob on the front fully clockwise. This is the current maximum speed position. Turn the maximum speed potentiometer inside the unit anti-clockwise to decrease the maximum speed setting and clockwise to increase the maximum speed setting.