TATA PUNCH-SERVICE MANUAL

FATC 24 SPECIFICATION NOMINAL VOLTAGE DC12V AIR GAP AT AMBIENT TEMP 20º 0.4 to 0.8 mm DIRECTION OF 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 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.