Functional Description

Functional Description

Fan:

The heating and ventilation fan Q1 is supplied with battery voltage via the key-operated services relay I35 - located in fusebox G1 -; in addition to the relay, the supply line also crosses fuse F13 of fusebox G1.

In the versions with fusebox "B" there is a specific relay I78 which exploits the previous line in terms of energization and supplies the fan as a direct line protected by fuse G255 (30A).

The fan motor Q1 is operated with an earth signal from the control knob Q4. This signal crosses the speed regulator Q5, comprising three resistances in series, the crossing of which determines the four different speeds, depending on the signal from the knob Q4: from pin 1 (1st speed), from pin 2 (2nd speed), from pin 3 (3rd speed) and lastly from pin 4 (4th speed)

with a direct signal that does not cross the regulator Q5.

The regulator Q5 has a built-in thermal safety fuse which deactivates the circuit if the temperature exceeds 98°C.

Recirculation:

N.B. recirculation is operated mechanically through a special cable.

Controls lighting:

Lights F8a and F8b, inside the control panel are supplied by the sidelights circuit - connector D of fusebox G1 (also see "Lighting of controls and Indicators").

Components and Connectors