Kubota B1830 Workshop Manual page 519

B1830,B2230,B2530,B3030, 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):
0.2 to 0.35 MPa (2.0 to 3.5 kgf/cm
HI pressure side (2):
1.96 to 2.45 MPa (20 to 25 kgf/cm
• 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. (See page 10-S18.)
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 (7 to 10 kgf/cm
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.
• Recharge new refrigerant to the proper level.
(See page 10-S20.)
(1) LO Pressure Side
10-S14
2
, 28 to 49.8 psi)
2
, 284.5 to 355.6 psi)
(2) HI Pressure Side
9Y1210003CAS0022US0
2
, 99.6 to 142.2 psi)
(2) HI Pressure Side
9Y1210003CAS0023US0
KiSC issued 05, 2012 A
CABIN