2810 Installation Instruction10.1. Select The Best Location• If an awning is built over the unit to prevent direct sunlight orrain, be careful that heat radiation from the condenser is notobstructed.• There should not be any animal or plant which could beaffected by hot air discharged.• Keep the spaces indicated by arrows from wall, ceiling,fence or other obstacles.• Do not place any obstacles which may cause a short circuitof the discharged air.* In case of indoor is CS-E21***, CS-XE21***, then ø 12.7t0.8 gas-pipe size must be used together with CZ-MA2P(pipe size expander)• If total piping length of all indoor units exceed the equivalentlength listed above, additional charge with 20g of refrigerant(R410A) for each additional meter of piping.Refrigerant piping sizeOutdoor Unit CU-3E18JBE CU-4E23JBELiquid - side ø 6.35 t0.8 ø 6.35 t0.8Gas - side ø 9.52 t0.8 ø 9.52 t0.8*(ø 12.7 t0.8)Outdoor Unit CU-3E18JBE CU-4E23JBEEquivalent length 30m 30mAllowable piping lengthOutdoor Unit CU-3E18JBE CU-4E23JBEAllowable piping length of each indoor unit (min. ~ max.) 3m ~ 25m 3m ~ 25mAllowable total piping length of all indoor unit 50m or less 60m or lessHeight difference between indoor and outdoor unit Outdoor unit located on upper side 15m or less 15m or lessOutdoor unit located otherwise 7.5m or less 7.5m or lessHeight difference between indoor unit Outdoor unit located on upper side 7.5m or less 7.5m or lessOutdoor unit located otherwise 15m or less 15m or less