Kubota M108S, Workshop Manual

Page: 495 / 523

10-S20
M108S, WSM CABIN
Charging an Empty or Partially Charged System (Vapor)
This procedure is to charge the system through the LO pressure
side with refrigerant in the vapor state. When the refrigerant
container is placed right side up, refrigerant will enter the system as
a vapor.
CAUTION
• Never open the HI pressure side valve of manifold gauge
while the engine is running.
NOTE
■
• Do not turn the refrigerant container upside-down when
charging the system by running the engine.
• Put refrigerant container into a pan of warm water (maximum
temperature 40 °C (104 °F)) to keep the vapor pressure in the
container slightly higher than vapor pressure in the system.
1. Check that the HI pressure side valve (4) is closed.
2. Start the engine and set an approx. 1500 min
-1
(rpm).
3. Turn on the A/C switch.
Set the temperature control lever to maximum cooling position
and the blower switch to HI position.
4. Open the LO pressure side valve (5) of manifold gauge and the
can tap valve (1) on refrigerant container and charge the
refrigerant until air bubbles in the sight glass of the receiver
vanish.
5. After charging the specified amount of refrigerant into the system,
close the LO pressure side valve (5) of manifold gauge and can
tap valve (1), then stop the engine.
6. Check for gas leak with an electric gas leak tester (see page 10-
S13).
(Reference)
• Specified amount of refrigerant (total) : R134a
0.95 to 1.05 kg
2.09 to 2.31 lbs
• Manifold gauge indication at fully charged system (at ambient
temperature: 30 °C (86 °F))
HI pressure side : 1.28 to 1.66 MPa
13.0 to 17.0 kgf/cm
2
185 to 241 psi
LO pressure side : 0.15 to 0.20 MPa
1.5 to 2.0 kgf/cm
2
21 to 28 psi
W1019245
(1) Can Tap Valve
(2) LO Pressure Gauge
(3) HI Pressure Gauge (4) HI Pressure Side Valve (Close)
(5) LO Pressure Side Valve (Open)
KiSC issued 06, 2007 A