Dual Pressure Switch - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
f. Dual pressure switch
(1) Location structure
The pressure switch is installed on the liquid
tube between the receiver and the expan-
sion valve. It detects abnormally high and
low pressure of the refrigerant and switches
off the magnetic clutch. Then the compres-
sor operation is stopped, preventing poten-
tial trouble with the system.

(1) Dual Pressure Switch

(2) When the Pressure is Abnormally High
When the pressure in the refrigeration cycle
becomes abnormally high, it may cause dam-
age to various components.
When it detects abnormally high pressure, gen-
erally about 32 kg/cm
turns off. This turns the magnetic clutch off and
stops the compressor (27 kg/cm
(3) When the Pressure is Abnormally Low
When there is insufficient refrigerant and the
pressure drops to 2.0 kg/cm
lower, the pressure switch turns off. This turns
the magnetic clutch off and stops the compres-
sor.
(1)
2
(3.14 MPa) the switch
2
for CFC12).
2
(0.20 MPa) or
VI-M-17
Fig. Location of Dual Pressure Switch
Fig. Dual Pressure Switch
Fig. Operation of Dual Pressure Switch for HFC134a.
VI Air Conditioner