SAFARI

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20
AIR CONDITIONING
DUAL PRESSURE SWITCH
Pressure switch is installed in the liquid line tube in
the cooling unit.
Pressure switch detects abnormally high and low
pressure of the refrigerant in the system, and turns
the magnetic clutch off.
Pressure switch will avoid compressor seizure.
If the pressure “P” is less than specified pressure,
the switch will be turned off.
Standard Pressure :
2.0+0.21kg/cm2 (30 + 2.8 psi) (Low Side)
32 + 2 kg/cm2 (455 + 28 psi) (High Side)
Themagnetic clutch can be turned on when the blower
switch and the A/C switch are turned on under the
condition that the refrigerant pressure is higher than
2.0 kg/cm2 (30+2.8 psi).
ANTIFREEZING DEVICES
Thermostat (if fitted)
Thermostat is a temperature sensing device and is
installed to sense the temperature of the air
discharged from the evaporator.
When the outlet air temp. from evaporator gives
below 0.500+0.500C the thermostat switches off the
compressor magnetic clutch.
CONTACT
POINT
TERMINAL &
FIXED CONTACT
0-RING
CASE
PRESSURE
DIAPHRAGM
HOUSING
SPRING
Fig. 22
Fig. 23