ALTROZ SERVICE MANUAL

FATC

MAGNETIC CLUTCH

SPECIFICATION

NOMINAL VOLTAGE

DC12V

AIR GAP AT AMBIENT

TEMP 20º

0.4 to 0.8 mm

DIRECTIONOF ROTATION

(CLUTCH SIDE VIEW)

Clockwise

A magnetic clutch is used to connect and disconnect

the compressor from the engine.

Main components are stator, rotor, and pressure

plate.

PRINCIPLE

When the current is fed to the coil magnetic force is

generated in iron, which attracts any other iron.

CONSTRUCTION

A magnetic clutch consists of a stator, rotor with

pulley, and pressure plate to engage the drive pulley

and compressor magnetically. The stator is fixed on

the compressor housing, and the pressure plate is

attached to the compressor shaft. Two ball bearings

are used between the inner surface of the rotor and

the front housing of the compressor.

OPERATION

Whenever the engine is operating, the pulley is

rotating since it is connected to the crankshaft by a

belt, but the compressor does not operate until the

clutch is energized. When the air conditioning

system is switched ON, the ECU generates a signal

for energizing the compressor. The electromagnet

attracts the pressure plate and pulls the plate against

the friction facings on the pulley. The friction

between the facing and plate causes the clutch

assembly to rotate as a unit, and drive the

compressor.

12. CONDENSER AND RECEIVER DRIER

CONDENSER

The condenser is a heat exchanger used to cool the

hot vapourised refrigerant. Also the refrigerant

changes its state from vapour to liquid. The

condenser is placed in front of the radiator behind

the radiator is the fan used to draw in ambient air.

CONDENSER SEALING DUCTS

Sealings are used to guide the flow of the air to the

condenser and also to avoid the hot air recirculating

from the engine compartment to the condenser.

RECEIVER DRIER (R.D)

The receiver drier is integrated into the Condenser

and has three main functions.

i) It absorbs the moisture in the refrigerant.

ii) It allows only liquid (

high pressure liquid)

to pass

through to the TXV.

It keeps a reserve of refrigerant to accommodate

fluctuating refrigerant requirements.