Description of operation

DESCRIPTION OF OPERATION

The fan N11 is supplied by the battery via the contact for relay J28 and is protected by the 30A fuse in unit B5. The fan starts working when the coil for relay J28 is energized and the contact closes.

The relay coil is energized through the engine management control unit M10 and by the temperature sensor K45. The control unit M10 receives a signal from the sensor K45 at pins 1 and 2 of connector B and when it feels it is appropriate (coolant overheating) it energizes the coil for relay J28 sending an earth signal to pin 86. The other pole of the coil, pin 85, is supplied directly at the battery via the 7.5A fuse for B35 and the 20A fuse for B5.

The condenser N13 fan motor is supplied via the contact for relay J33, from the 30A fuse B51. Fuse B51 is supplied directly by the battery.

The engagement of the fan N13 motor is established by the 3 stage pressure switch K5 which energizes the coil for relay J33 providing an earth at pin 86. The other end of the coil is connected to the 15A fuse B40 which is supplied via the contact for relay J10 by the 20A fuse for B5. Fuse B5 is connected directly to the battery.

The energizing of the relay J10 and the consequent supply of the line protected by the 15A fuse B50 is determined by the ignition switch being turned to the ON position and the go ahead from the engine management control unit M10. The igniton key in the ON position allows the coil for relay J10 to be supplied whilst the control unit M10 energizes the coil for J10 via pin 6, connector A. When the line protected by B10 is supplied, the coil for relay J33 can be energized by the pressure switch K5 with the consequent supply of motor N13.

COMPONENTS