wsm STW37 Workshop Manual page 514

STW34, STW37, STW40, 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 (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-S22.)
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. (See page 10-S18.)
• Recharge new refrigerant to the proper level. (See page
10-S20.)
(1) LO Pressure Side
10-S15
2
, 28.4 to 49.8 psi)
2
, 284.5 to 355.6 psi)
(2) HI Pressure Side
9Y1211109CAS0021US0
2
, 99.6 to 142.2 psi)
(2) HI Pressure Side
9Y1211109CAS0022US0
KiSC issued 11, 2014 A
CABIN