Panasonic WU-144MF1U9E ECOi/VRF Systems Indoor Unit Installation Manual - Page 24

19/32 CAUTION 2-1/8 2-1/8 ● The indoor unit includes a drain pump. Be sure to use a level gauge and verify that the unit is level. ● Before inserting the ceiling material, complete as much of the drain piping work and refrigerant tubing work as possible. (6) The distance between the unit and the opening of the ceiling and the distance between the bottom surface of the ceiling and the bottom surface of the flange of the unit should follow the dimensions given in Figs. 3-60 and 3-61. 19/32 Suspension bolts Tubing side Suspension bolts Fig. 3-60 Unit: in. 3-16. Installing the Drain Piping (1) Prepare standard hard PVC pipe (O.D. 1-1/4") for the drain and use the supplied drain hose and hose band to prevent water leaks. The PVC pipe must be purchased separately. The unit's transparent drain port allows you to check drainage. (Fig. 3-62) CAUTION ● Do not use adhesive at the drain connection port on the indoor unit. ● Insert the drain pipe until it contacts the socket, as shown in the figure at right, then secure it tightly with the hose band. ● Tighten the hose clamps so their locking nuts face upward. (Fig. 3-62) ● Do not use the supplied drain hose bent at a 90° angle. (The maximum permissible bend is 45°.) ● Check the drainage at the unit drain port (transparent). (2) After checking the drainage, wrap the supplied packing and drain pipe insulator around the pipe, then secure it with the supplied clamps. (Fig. 3-63) Ceiling material 25/32 25/32 25/32 Fig. 3-61 Align the hose band with end of the hose, and tighten so that it does not contact the bead. Drainage check section on drain port (transparent) Supplied PVC adhesive drain hose Hard PVC pipe VP-25 (Field supply) Bead Packing (supplied) Drain insulator (supplied) Fig. 3-62 Drain insulator (supplied) NOTE Make sure the drain pipe has a downward gradient (1/100 or more) and that there are no water traps. Fig. 3-63 24 73'@*OEPPS@64JOEC