16 | Unit installationInstaller and user reference guide58FXUA50~100AVEBVRV system air conditioner4P673843-1 – 2022.012 For rear and upward piping, wrap the vinyl tape 2 or 3 times around the elbowso that the tape covers more than the width of the metal camp, leaving10~15 mm unwrapped at the end of the elbow.3 Tighten the metal clamp over the taped part of the elbow or drain hose with atorque of 1.35±0.15N·m. Wrap the end of the metal clamp with vinyl tape orbend the end inwards to avoid damaging the sealing pad.4 Check for water leaks (see "To check for water leaks" [458]).5 Wind the large sealing pad (= insulation) around the metal clamp and drainhose, and fix it with tie wraps. Start wrapping from the tightened part of themetal clamp so that the end of the metal clamp is wrapped twice.6 Connect the drain piping to the drain hose.To check for water leaksThe procedure differs depending on whether installation of the system is alreadycompleted. When installation of the system is not yet completed, temporarilyconnect the user interface and power supply to the unit.When installation of the system is not yet completed1 Temporarily connect electrical wiring.▪ Remove the service cover. See "18.2 To connect the electrical wiring to theindoor unit" [469].▪ Connect the user interface (a).▪ Connect the power supply (b).▪ Reattach the service cover. See "18.2 To connect the electrical wiring to theindoor unit" [469].NLbaa User interface terminal blockb Power supply terminal block2 Turn ON the power.3 Start fan only operation (see the reference guide or the service manual of theuser interface).4 Gradually pour approximately 1 l of water through the air discharge outlet,and check for leaks.3 42 1b ca≥100 mm