CABIN
L3540-II, L4240-II, L5040-II, L5240-II, L5740-II , WSM
10-S13
5. CHECKING AND CHARGING REFRIGERANT
CYCLE
[1] CHECKING WITH MANIFOLD GAUGE
• The gauge indications described in the following testing are those taken under the same condition, so it
should be noted that the gauge readings will differs somewhat with the ambient conditions.
Condition
• Ambient temperature: 30 to 35 °C (86 to 95 °F)
• Engine speed: Approx. 1500 min
-1
(rpm)
• Temperature control lever: Maximum cooling position
• Air-Conditioner switch: ON
• Blower switch: HI position
9Y1211167CAS0017US0
Manifold Gauge Connecting and Test Preparation
1. Close the manifold gauge HI and LO pressure side valve (4), (5)
tightly.
2. Connect the charging hose (7) (red) to the HI pressure side
charging valve (2) and connect the charging hose (1) (blue) to
the LO pressure side charging valve (6).
• Be sure to drive out the air in the charging hoses at the
manifold gauge connection end by utilizing the refrigerant
pressure in the refrigerating cycle.
3. Start the engine and set at approx. 1500 min
-1
(rpm).
4. Turn on the A/C switch and set the temperature control lever to
maximum cooling position.
5. Set the blower switch to HI position.
9Y1211167CAS0018US0
Normal Operating
If the refrigerating cycle is operating normally, the reading at the
LO pressure side (1) should be generally by around 0.15 to 0.2 MPa
(1.5 to 2.0 kgf/cm
2
, 21 to 28 psi) and that at the HI pressure side (2)
around 1.27 to 1.66 MPa (13 to 17 kgf/cm
2
, 185 to 242 psi).
9Y1211167CAS0019US0
(1) Charging Hose (Blue)
(2) HI Pressure Side Charging Valve
(3) Manifold Gauge
(4) HI Pressure Side Valve
(5) LO Pressure Side Valve
(6) LO Pressure Side Charging Valve
(7) Charging Hose (Red)
Gas pressure
Factory
specifica-
tion
Low pressure
side
0.15 to 0.20 MPa
1.5 to 2.0 kgf/cm
2
21 to 28 psi
High pressure
side
1.27 to 1.66 MPa
13 to 17 kgf/cm
2
185 to 242 psi
(1) LO Pressure Side (2) HI Pressure Side
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