1. Cut off the power supply to the external unit art. 4662C;

2. enable programming mode by moving the relevant slider;

3. set the dip switch activation code: dip switches 1-2-3 to ON, the other dip switches to OFF;

4. restore the power supply to external unit art. 4662C;

5. the external unit will now beep twice to request the confirmation code;

6. set the dip switch confirmation code: dip switches 1-2-3 to OFF, the other dip switches to ON (i.e. the opposite of the activation code);

7. exit programming mode by moving the relevant slider;

8. external unit art. 4662C will now beep for 2-3 seconds to indicate that the configuration has been reset;

9. when the beep has ended, external unit art. 4662C will start up with its factory set configuration values.