Kubota M5040 Workshop Manual page 523

M5040, M6040, M7040, WSM
Air Entered in the Cycle
1. Symptoms seen in refrigerating cycle
- Both LO and HI pressure side (1), (2) pressures too high.
LO pressure side (1) : 0.20 to 0.35 MPa
HI pressure side (2) : 1.96 to 2.45 MPa
- LO pressure side (1) piping not cold when touched.
2. Probable cause
- Air entered in refrigerating cycle.
3. Solution
- Replace receiver.
- Check compressor oil contamination and quantity.
- Evacuate and recharge new refrigerant.
Charging the Refrigerant" in this section.)
NOTE
• The above cycle can be seen when the cycle is charged
without evacuation.
(1) LO Pressure Side
Moisture Entered in the Cycle
1. Symptoms seen in refrigerating cycle
- The air conditioner operates normally at the beginning, but over
time, LO pressure side (1) pressure is vacuum and HI
pressure side (2) is low pressure.
LO pressure side (1) : Vacuum
HI pressure side (2) : 0.69 to 0.98 MPa
2. Probable cause
- The moisture in the refrigerating cycle freezes in the expansion
valve orifice and causes temporary blocking. After a time, the
ice melts and condition returns to normal.
3. Solution
- Replace receiver.
- Remove moisture in cycle by means of repeated evacuation.
(Refer to "(2) Evacuating the System" in this section.)
- Recharge new refrigerant to the proper level. (Refer to "(3)
Charging the Refrigerant" in this section.)
(1) LO Pressure Side
10-S15
2
(2.0 to 3.5 kgf/cm , 28.4 to 49.8 psi)
2
(20 to 25 kgf/cm , 284.5 to 355.6 psi)
(2) HI Pressure Side
2
(7 to 10 kgf/cm , 99.6 to 142.2 psi)
(2) HI Pressure Side
KiSC issued 06, 2008 A
CABIN
(Refer to "(3)
W1016771
W1017013