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7C-2 MANUAL CONTROL HVAC SYSTEM
SYSTEM COMPONENTS-
FUNCTIONAL
Compressor
All compressor are belt-driven from the engine
crankshaft through the compressor clutch pulley. The
compressor pulley rotates without driving the
compressor shaft until an electromagnetic clutch coil
is energized. When voltage is applied to energize the
clutch coil, the clutch plate and hub assembly is drawn
rearward toward the pulley. The magnetic force locks
the clutch plate and pulley together as one unit to drive
the compressor shaft.
As the compressor shaft driven, it compresses the low
pressure refrigerant vapor from evaporator into high
pressure, high temperature vapor. The refrigerant oil
that is used to lubricate the compressor is carried with
the refrigerant.
Magnetic Clutch
The magnetic clutch is assembled in front of the
compressor and controls to stop or operate the
compressor.
The center piece is inserted to the compressor
crankshaft and rotate the only the pulley when it
doesn't operate the compressor. When the A/C switch
is turned ON, the current flows into the wrapped coil of
the stator and the stator is converted to the powerful
electromagnet. Therefore, the compressor can rotate
with the pulley together because the stator can pull
the center piece tightly.
V-5 Compressor-General
Description
Vehicle using the V5 compressor may have differences
between installations in the mounting brackets, the
drive system, the pulleys, the connections and the
system capacities. Basic overhaul procedures are
similar between the compressors used on different
vehicles.
When serving the compressor, keep dirt and foreign
material from getting on or into the compressor parts
and the system. Clean tools and a clean work area are
important for proper service. The compressor
connections and outside of the compressor should be
cleaned before performance of any on-vehicle repairs
and before removal of the compressor. The parts must
be kept clean at all times and any parts that are to be
reassembled should be cleaned with trichloroethane,
naphtha, stoddard solvent, kerosene or equivalent
solvents and dried with dry air. Use only lint-free cloths
to wipe the parts.
DESCRIPTION AND OPERATION
The operations described are based on bench overhaul
with the compressor removed from the vehicle, except
as noted. They have been prepared in the order of
accessibility of the components. When a compressor
is removed from the vehicle for servicing, the amount
of oil remaining the compressor should be drained,
measured and recorded. This should then be
discarded and new polyalkaline glycol (PAG) refrigerant
oil added to the compressor.
Important: The oil drain plug must be removed and
the oil drained through the plug opening to insure
complete draining of oil from the compressor.
V-5 Compressor-Operation
The V5 is a variable displacement compressor that can
match the automotive air conditioning demand under
all conditions without cycling. The basic compressor
mechanism is a variable angle wobble-plate with seven
axially oriented cylinders. The center of the control of
the compressor displacement is a billows-actuated
control valve located in the rear head of the compressor
that senses compressor suction pressure.
The wobble-plate angle and the compressor
displacement are controlled by the crankcase suction
pressure differential. When the A/C capacity demand
is high, the suction pressure will be above the control
point. The valve will maintain a bleed from crankcase
to suction. With no crankcase suction pressure
differential, the compressor will have maximum
displacement.
When the A/C capacity demand is lower and the suction
pressure reaches the control point, the valve will bleed
discharge gas in the crankcase and close off a passage
from the crankcase to suction plenum. The angle of
the wobble-plate is controlled by a force balance of
seven pistons. A slight elevation of the crankcase
suction pressure differential creates total force on the
piston resulting in a movement about the wobble-plate
pivot pin that reduces the plate angle.
The compressor has a unique lubrication system. The
crankcase suction bleed is routed through the rotating
wobble-plate for lubrication of wobble-plate bearing.
The rotation acts as an oil separator that removes some
of the oil from the crankcase where it can lubricate the
compressor mechanism.
Condenser Core
The condenser assembly in front of the radiator consists
of coils, which carry the refrigerant and cooling fins
that provide the rapid transfer of heat. The air passing
through the condenser cools the high-pressure
refrigerant vapor and causes it to condense it to
condense into a liquid.
SSANGYONG Y200
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