CABIN
M6060, M7060, WSM
9-S31
(10) Pressure Switch
Pressure Switch
1) HI Pressure Side
1. Connect the manifold gauge (3) to compressor as following
procedure.
Close the HI and LO pressure valves (4), (5) of manifold gauge
tightly, and connect the charging hoses (2), (1) (red and blue) to
the respective compressor service valves. (See page 9-S10)
• Be sure to drive out the air in the charging hoses at the
manifold gauge connection end by utilizing the refrigerant
pressure in the refrigerant cycle.
2. Start the engine and set at approx. 1500 min
-1
(rpm). Turn on
the A/C switch, then set the blower switch to HI position.
3. Raise pressure on the HI pressure side of the refrigerant cycle
by covering the condenser front with a corrugated cardboard,
and the pressure switch is activated and the compressor
magnetic clutch is turned off. At this time, read the HI pressure
gauge of the manifold gauge. If this pressure reading differs
largely with the setting pressure, replace the pressure switch
with a new one.
2) LO Pressure Side
1. Disconnect 2P connector (6) of pressure switch.
2. Measure the resistance with an ohmmeter across the connector
terminals.
3. If 0 ohm is not indicated at normal condition, there is no
refrigerant in the refrigerating cycle because gas leaks or
pressure switch is damaged.
(Reference)
• The resistance of pressure switch is 0 ohm in normal condition,
but it becomes infinity if the pressure is out of factory spec..
Because the pressure switch starts to work.
9Y1210828CAS0051US0
Setting pressure
Factory
specifica-
tion
Pressure
switch
OFF
More than
approx.
3.1 MPa
32 kgf/cm
2
460 psi
Setting pressure
Factory
specifica-
tion
Pressure
switch
OFF
Less than
approx.
0.20 MPa
2.0 kgf/cm
2
28 psi
(1) Charging Hose (Blue)
(2) Charging Hose (Red)
(3) Manifold Gauge
(4) HI (High Pressure Side) Charging
Valve
(5) LO (Low Pressure Side) Charging
Valve
(6) 2P Connector
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