2.3.1. Pipes that are one size larger canalso be connected for renewal•••• If renewing the system, existing refrigerant pipes can beutilized so that only the indoor units and outdoor units needto be replaced.•••• For example, liquid and gas pipes from 10 years ago can beconnected to current pipes with the same size for one sizelarger. Effective utilization of materials reduces workingtime and trouble. (Adaptor sockets are not supplied.)2.3.2. Additional refrigerant chargingunnecessary for 30 m•••• All models do not require any additional charging ofrefrigerant for 30 m of pipe length. This makes installationmuch easier.2.3.3. Drain water dripping-preventionstructure•••• The base of the outdoor unit is provided with a single drainhole in order to prevent drain water from leaking out of theunit. Body connecting a drain elbow and a discharge pipe,water leakages can be prevented even when the unit isinstalled against a wall.2.3.4. Space saving design allows unitsto be installed side by sidecontinuously•••• Servicing after installation can be carried out by removingthe front covers.2.3.5. Easy test operation•••• Test operation can be carried out for both indoor andoutdoor units.2.3.6. Long pipe designMax piping length: 50 (m) 18BB~50BBHeight difference/equivalent pipe length 30/502.3.7. Internal pipe connection•••• Pipes are connected inside the units (inside the sidecovers), making the final appearance more attractive.•••• Pipes can be diverted outward in any of four directions(forward, right, down, rear).•••• Small liquid pipe diameters of 9.52mm for 50BB model,making installation work much easier.2.3. Greatly improved workability increases system renewal capability5