Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Air Conditioning System MSA5TCD00L18243

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              LEGACY (W2260BE_SGML Complete)



                               MECHANISM AND FUNCTION                                 [M500]     4-7
                                                                                       5. Dual Switch


5. Dual Switch
The dual switch is located on the high pressure line above the receiver dryer. When an abnormal
pressure occurs in the high pressure line, the dual switch is forced to OFF to stop operation of the
compressor.
D When the pressure is abnormally low [177 kPa (1.8 kg/cm2, 26 psi) or less]
The dual switch is forced to OFF to prevent operation of the compressor when there is no gas
caused by leakage of the refrigerant.
D When the pressure is abnormally high [2,940 kPa (30 kg/cm2, 427 psi) or more]
The dual switch is forced to OFF to protect the air-conditioning cycle parts.




                                                                                           B4H0172C

     (1) Point terminal                                (4) Press guide
     (2) Contact point                                 (5) High pressure disc
     (3) Guide pin                                     (6) Low pressure disc




                                                11
                      LEGACY (W2260BE_SGML Complete)



4-7      [M5A0]                MECHANISM AND FUNCTION
5. Dual Switch


A: DURING NORMAL OPERATION (CONTACT POINT IS ON)
When the refrigerant pressure is applied from inside the housing to the seal film, a force is exerted
from the stopper, guide head, high pressure disc and high pressure internal lid to the low pressure
disc to set the low pressure guide pin free, causing the moving contact to be ON.




                                                                                                 B4H0173

B: DURING ABNORMAL LOW-PRESSURE OPERATION
If the refrigerant pressure falls, the pressure on the seal film is lost, and the force exerted from the
stopper, guide head, high pressure disc and high pressure internal lid to the low pressure disc
decreases, and the low pressure disc rotates back, pressing the guide pin down and causing the
moving contact to be OFF.




                                                                                                 B4H0174


C: DURING ABNORMAL HIGH-PRESSURE OPERATION
If the refrigerant pressure becomes abnormally high, a force is exerted from the seal film to the
guide head and press guide, and the high pressure disc rotates back, pressing the guide pin
down and causing the moving contact to be OFF.




                                                                                                 B4H0175




                                                  12

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