Rotenso J100Wi, Service Manual

Page: 77 / 132

LCAC R32 Series
77 Service manual
NOTE:
• Refrigerant may only be charged after performed the vacuum drying process.
• Always use gloves and glasses to protect your hands and eyes during the charge work.
• Use electronic scale or fluid infusion apparatus to weight refrigerant to be recharged. Be sure to avoid extra
refrigerant charged, it may cause liquid hammer of the compressor or protections.
• Use supplementing flexible pipe to connect refrigerant cylinder, pressure gauge and outdoor unit. And The
refrigerant should be charged in liquid state. Before recharging, The air in the flexible pipe and manifold
gauge should be exhausted.
• After finished refrigerant recharge process, check whether there is refrigerant leakage at the connection joint
part.(Using gas leakage detector or soap water to detect).
Diameter of liquid pipe (mm)
Φ6.35 Φ9.52
Formula V=15g/m×(L-5) V=30g/m×(L-5)
V: Additional refrigerant charge volume (g). L : The length of the liquid pipe (m).
8. ADDITIONAL REFRIGERANT CHARGE
• After the vacuum drying process is carried out, the additional refrigerant charge process need to be performed.
• The outdoor unit is factory charged with refrigerant. The additional refrigerant charge volume is decided by
the diameter and length of the liquid pipe between indoor and outdoor unit. Refer the following formula to
calculate the charge volume.
7.3.2 Special vacuum drying
The special vacuum drying method shall be adopted when:
1. Finding moisture during flushing refrigerant pipe.
2. Conducting construction on rainy day, because rain water might penetrated into pipeline.
3. Construction period is long, and rain water might penetrated into pipeline.
4. Rain water might penetrate into pipeline during construction.
Procedures of special vacuum drying are as follows:
1. Vacuum drying for 1 hour.
2. Vacuum damage, filling nitrogen to reach 0.5Kgf/cm2 .
Because nitrogen is dry gas, vacuum damage could achieve the effect of vacuum drying, but this method could
not achieve drying thoroughly when there is too much moisture. Therefore, special attention shall be drawn to
prevent the entering of water and the formation of condensate water.
3. Vacuum drying again for half an hour.
If the pressure reached -755mmHg, start to pressure leakage test. If it cannot reached the value, repeat vacuum
damage and vacuum drying again for 1 hour.
4. Leakage test: After the vacuum degree reaches -755mmHg, stop vacuum drying and keep the pressure for 1
hour. If the indicator of vacuum gauge does not go up, it is qualified. If going up, it indicates that there is moisture
or leak source.
PART 4. INSTALLATION