Kubota WSM B2050 Workshop Manual page 504

B2050, B2350, B2650, B3150, WSM
Insufficient Refrigerant
1. Symptoms seen in refrigerating cycle
• Both LO and HI pressure side (1), (2) pressures too low.
LO pressure side (1):
0.05 to 0.1 MPa (0.5 to 1.0 kgf/cm
HI pressure side (2):
0.69 to 0.98 MPa (7 to 10 kgf/cm
• Bubbles seen in sight glass.
• Air discharged from air conditioner sightly cold.
2. Probable cause
• Gas leaking from some place in refrigerant cycle.
3. Solution
• Check for leakage with electric gas leak tester and repair.
• Recharge refrigerant to the proper level. (See page 10-S19.)
(1) LO Pressure Side
Excessive Refrigerant or Insufficient Condenser Cooling
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 (2.0 to 3.5 kgf/cm
HI pressure side (2):
1.96 to 2.45 MPa (20 to 25 kgf/cm
2. Probable cause
• Overcharging refrigerant into cycle.
• Condenser cooling damaged.
3. Solution
• Clean condenser. (See page G-33.)
• Adjust air conditioner belt to proper tension. (See page 1-S25.)
• If the above two items are in normal condition, check refrigerant
quantity. (See page G-42.)
NOTE
• If excessive refrigerant is to be discharged, loosen
manifold gauge LO pressure side valve and vent out
slowly.
(1) LO Pressure Side
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 (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-S19.)
NOTE
• The above cycle can be seen when the cycle is charged
without evacuation.
(1) LO Pressure Side
10-S14
2
, 7.1 to 14.2 psi)
2
, 99.6 to 142.2 psi)
(2) HI Pressure Side
9Y1210982CAS0020US0
2
, 28.4 to 49.8 psi)
2
, 284.5 to 355.6 psi)
(2) HI Pressure Side
9Y1210982CAS0021US0
2
, 28.4 to 49.8 psi)
2
, 284.5 to 355.6 psi)
(2) HI Pressure Side
9Y1210982CAS0022US0
KiSC issued 03, 2014 A
CABIN