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HVAC
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HVAC
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 pul-
ley, 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 rotat-
ing 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 ener-
gizing 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.
10.1.5.5 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 conden-
ser in this vehicle, as in many other vehicles is
placed in front of the radiator. A condenser fan is
provided to force the air in to the condenser to cool
the refrigerant inside the core.
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.