Functional Description

Functional Description

The fan P2 provides the necessary ventilation of the cooling air for the radiator and engine and for the air conditioning system condenser.

This fan is always supplied by battery voltage through the line protected by the specific wander fuse G254, to be found next to the branch terminal box: it is therefore operated by an earth signal: this signal arrives directly (2nd speed) or through the additional resistance O22 (1st speed).

The fan P2 is operated at the two different speeds by the two- level thermal contact L33 which controls the temperature of the coolant in the engine radiator: when a first level is reached, relay I99a is energised,

located in the fuxebx G1, which sends the earth signal to the fan P2 through resistance O22: 1st speed.

If the second temperature level is reached, relay I100 is energised, located on the fan duct, which sends the earth signal directly to the fan P2: 2nd speed.

The two relays receive the key-operated supply; I100 is supplied by the line of fuse F4 of G1.

Similarly, the fan P2 is controlled at the first speed by an earth signal leading from the trinary pressure switch Q20.

When the pressure switch signal ceases, the fan is immediately disengaged.