1. The equipment must be earthed. It may cause electrical shock if grounding is not perfect.2. Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates atsurrounding of the unit, it may cause fire.3. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage thefurniture.4. Pb free solder has a higher melting point than standard solder; typically the melting point is 50 - 70°F (30 - 40°C) higher. Please use ahigh temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 20°F (370 10°C).Pb free solder will tend to splash when heated too high (about 1100°F/600°C).1. Selection of the installation location. Select an installation location which is rigid and strong enough to support or hold the unit, and selecta location for easy maintenance.2. Power supply connection to the air conditioner. Connect the power supply cord of the air conditioner to the mains using one of thefollowing methods. Power supply point shall be the place where there is ease for access for the power disconnection in case ofemergency.In some countries, permanent connection of this room air conditioner to the power supply is prohibited.1. Power supply connection to the receptacle using a power plug. Use an approved power plug with earth pin for the connection to thesocket.2. Power supply connection to a circuit breaker for the permanent connection. Use an approved circuit breaker for the permanentconnection. It must be a double pole switch with a minimum 4/32 inches contact gap.3. Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigeration parts. Take careof the liquid refrigerant, it may cause frostbite.4. Installation work. It may need two people to carry out the installation work.5. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.4CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU