10.3.7. PIPE INSULATION1. Please carry out insulation at pipe connection portion asmentioned in Indoor/Outdoor Unit Installation Diagram.Please wrap the insulated piping end to prevent water fromgoing inside the piping.2. If drain hose or connecting piping is in the room (where dewmay form), please increase the insulation by using POLY-EFOAM with thickness 6 mm or above.DISPOSAL OF OUTDOOR UNIT DRAIN WATER• If a drain elbow is used, the unit should be placed on astand which is taller than 3 cm.• If the unit is used in an area where temperature falls below0°C for 2 or 3 days in succession, it is recommended not touse a drain elbow, for the drain water freezes and the fanwill not rotate.CHECK THE DRAINAGE• Open front panel and remove air filters.(Drainage checking can be carried out without removing thefront grille.)• Pour a glass of water into the drain tray-styrofoam.• Ensure that water flows out from drain hose of the indoorunit.EVALUATION OF THE PERFORMANCE• Operate the unit at cooling operation mode for fifteenminutes or more.• Measure the temperature of the intake and discharge air.• Ensure the difference between the intake temperature andthe discharge is more than 8°C.NOTE:These equipment shall be connected to a suitable mains networkwith a main impedance less than the following:CS / CU-C18BKP5: 0.20 ΩCS / CU-A18BKP5: 0.20 ΩCS / CU-C24BKP5: 0.12 ΩCS / CU-A24BKP5: 0.14 ΩCHECK ITEMSIs there any gas leakage at flare nut connections?Has the heat insulation been carried out at flare nutconnection?Is the connecting cable being fixed to terminal board firmly?Is the connecting cable being clamped firmly?Is the drainage OK?(Refer to “Check the drainage” section)Is the earth wire connection properly done?Is the indoor unit properly hooked to the installation plate?Is the power supply voltage complied with rated value?Is there any abnormal sound?Is the cooling operation normal?Is the thermostat operation normal?Is the remote control’s LCD operation normal?Is the air purifying filter installed?43CS-C18BKP CU-C18BKP5 / CS-C18BKP CU-C18BKP6 / CS-C24BKP CU-C24BKP5 / CS-C24BKP CU-C24BKP6