Kubota KX080-4 Workshop Manual page 470

KX080-4, WSM
Air mixed into the cycle
1. Symptoms that appear in the refrigerant cycle
• Both high (2) and low (1) side pressures are too high.
Low-pressure side (1) : 0.20 to 0.35 MPa (2.0 to 3.5 kgf/cm
28.4 to 49.8 psi)
High-pressure side (2) : 1.96 to 2.45 MPa (20 to 25 kgf/cm
284.5 to 355.6 psi)
• The line on the low-pressure side (1) feels cold to the touch.
2. Possible Causes
• Air is mixed in the refrigerant cycle
3. Solution Methods
• Replace the receiver.
• Check the amount of compressor oil and whether it is
contaminated.
• Vacuum it out and charge the cycle again with fresh
refrigerant.
CAUTION
• If you fail to vacuum out a refrigerant cycle like that
mentioned above and simply charge the cycle with
refrigerant, the problem may recur.
(1) Low Pressure Side
Moisture mixed into the cycle
1. Symptoms that appear in the refrigerant cycle
• At first the A/C works normally, but after some time, the
pressure on the low-pressure side (1) becomes a vacuum
and the high-pressure side (2) is at a low pressure.
Low-pressure side (1) : Vacuum;
High-pressure side (2) : 0.69 to 0.98 MPa (7 to 10 kgf/cm
99.6 to 142.2 psi)
2. Possible Causes
• Moisture in the refrigerant cycle freezes up in the expansion
valve orifice, creating a temporary blockage. As time
elapses, the ice thaws and it returns to normal.
3. Solution Methods
• Replace the receiver.
• Eliminate the moisture in the refrigerant cycle by repeatedly
vacuuming it out.
• Recharge the system with an appropriate amount of
refrigerant.
(1) Low Pressure Side
5-S13
(2) High Pressure Side
RY9212001CAS0021US0
(2) High Pressure Side
RY9212001CAS0022US0
KiSC issued 08, 2015 A
CABIN
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