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HVAC
22
10.1.5.4 COMPRESSOR
SPECIFICATION
MODEL
QS90
DISPLACEMENT
VOL.
89 cm
3
/ rev.
LUBRICANT
S10X or Equivalent
QUANTITY
70
+20
cm
3
The Compressor used in the vehicle is scroll type
compressor.
This compressor has two identical scrolls arranged
at 180º around a offset center; one of them is fixed
(fixed scroll) and the other (orbit scroll) is turned at a
constant attitude, so that the space made between
the scrolls symmetrically around the rotating shaft
moves from outside toward the center while reducing
its volume; this is the principle of compression.
The moving scroll rolls and slides in small circular
movement with a small friction loss, ensuring smooth
operation even during start-up.
COMPRESSOR RELAY
Compressor relay is located in the MDU (
Main distri-
bution Unit)
located in the engine compartment
which is used to operate the compressor magnetic
clutch. The magnetic clutch continues to operate as
long as air conditioner is under operation. Once the
air conditioner is put in OFF condition, the compres-
sor relay gets cut off and the magnetic clutch gets
disengaged from the compressor. The cut - in and
cut - off of relay is governed by the ENGINE ECU.
The HVAC control unit controls the compressor
ON/OFF indirectly by sending ON/OFF request to
the EMS ECU.
MAGNETIC CLUTCH
SPECIFICATION
NOMINAL VOLTAGE
DC12V
AIR GAP
0.2 to 0.45mm
DIRECTION OF RO-
TATION
Clockwise
A magnetic clutch is used to connect and disconnect
the compressor from the engine.
Main components are stator, rotor, and pressure
plate.