HARRIER SERVICE MANUAL PART -1

HVAC 18 8. COMPRESSOR SPECIFICATION MODEL SD7V16 MAXIMUM DIS- PLACEMENT 161.3 cm 3 / rev . MINIMUM DIS- PLACEMENT 9.7 cm 3 / rev . LUBRICANT SP10 or Equivalent OIL QUANTITY 135 cm 3 The Compressor used in the vehicle is variable dis- placement type. 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 0.4 TO 0.8MM DIRECTION OF ROTATION CLOCKWISE Meet jaso e111-06, 6pka - 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 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