Checking And Charging Refrigerant Cycle; Checking With Manifold Gauge - wsm STW37 Workshop Manual

STW34, STW37, STW40, WSM
5. CHECKING AND CHARGING REFRIGERANT
CYCLE

[1] CHECKING WITH MANIFOLD GAUGE

IMPORTANT
• 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
• Temperature control lever: Maximum cooling position
• Air-Conditioner switch: ON
• Blower switch: HI position
-1
(rpm)
Manifold Gauge Connecting and Test Preparation
1. Close the manifold gauge HI and LO pressure side valve (5), (6)
tightly.
2. Connect the charging hose (4) (red) to the HI pressure side
charging valve (3) and connect the charging hose (2) (yellow) to
the LO pressure side charging valve (1).
NOTE
• 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
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.
(1) LO Pressure Side Charging Valve
(2) Charging Hose (Yellow)
(3) HI Pressure Side Charging Valve
(4) Charging Hose (Red)
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
around 1.27 to 1.66 MPa (13 to 17 kgf/cm
Gas pressure
(1) LO Pressure Side
10-S13
(5) HI Pressure Side Valve
(6) LO Pressure Side Valve
(7) Manifold Gauge
2
, 21 to 28 psi) and that at the HI pressure side (2)
2
Low pressure
side
Factory
specifica-
tion
High pressure
side
(2) HI Pressure Side
CABIN
9Y1211109CAS0016US0
-1
(rpm).
9Y1211109CAS0017US0
, 185 to 242 psi).
0.15 to 0.20 MPa
2
1.5 to 2.0 kgf/cm
21 to 28 psi
1.27 to 1.66 MPa
2
13 to 17 kgf/cm
185 to 242 psi
9Y1211109CAS0018US0
KiSC issued 11, 2014 A