Functional Description

The delaying device Q42, located in group Q41, controls the cutting-in of the electric fan to improve the cooling of the air conditioning system compressor.

The electric fan P2 is controlled by a supplementary relay Q14 , also connected in group Q41, and is supplied by battery voltage through fuse Q35 (40A), also in Q41.

The key-operated voltage supplies the coil and the electronic devices of the delay system, the fan relay I1 and supplementary relay Q14 -pin 85 (from

chassis N ___ the coil of Q14 is powered with a key-operated supply from the line of fuse F15 (10A) of G1); the coil of the delay device Q42 is excited by an ground signal -pin P- coming from the tinary pressure switch Q20 provoking the transmission of an ground signal - pin 30- to the additional resistance O22 and from it to the fan P2, which then cuts-in at 1st speed.

Level 1 (87-92°C) of the thermocontact L33 causes the actuation of the relay I1 and sends an ground signal directly to the additional resistance O22.

After about 10 seconds, if the control signal persists (or level 2 of thermocontact L33 is reached (92-97°C)) the delay device Q42 -pin 86- (or the level 2 contact of L33) send an ground signal which excites the coil of the supplementary relay Q14 and actuates the electric fan P2 at 2nd speed

Starting from chassis N ___ the layout of the air conditioner wiring has been changed with modification of the connections only as described above.