wsm M7060 - Page 597

CABIN
M6060, M7060, WSM
9-S15
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 0.34 MPa (2.0 to 3.5 kgf/cm
2
, 29 to 49 psi)
HI pressure side (2):
2.0 to 2.4 MPa (20 to 25 kgf/cm
2
, 290 to 350 psi)
• 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 9-S20.)
NOTE
• The above cycle can be seen when the cycle is charged
without evacuation.
9Y1210828CAS0021US0
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 (7.0 to 10 kgf/cm
2
, 100 to 140 psi)
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 9-S19.)
• Recharge new refrigerant to the proper level. (See page
9-S20.)
9Y1210828CAS0022US0
(1) LO Pressure Side (2) HI Pressure Side
(1) LO Pressure Side (2) HI Pressure Side
KiSC issued 08, 2013 A