(P): Main power supply input.
(1): Relay connection. There is always 230V between ~ and N when the transformer knob is in one of the positions 1-5.
(2): Earth
(3): Fan connection output.
(Rt): Room thermostat (if the room thermostat is not in use, Rt shall be looped together)
(TK): Motor protection (if the motor protection is not in use, TK shall be looped together)