Base plate
Drain nipple
Water-proof rubber caps 
(supplied with the outdoor unit)
10-4-3. Draining the Water
• Holes are provided on the base plate of the
outdoor unit to ensure that the defrost water
produced during heating operations is drained off
efficiently.
If a centralized drain is required when installing the
unit on a balcony or wall, follow the steps below to
drain off the water.
1. Proceed with water-proofing by installing the 
water-proof rubber caps in the 2 elongated holes 
on the base plate of the outdoor unit. [How to 
install the waterproof rubber caps]
1) Place four fingers into each cap, and insert 
the caps into the water drain holes by pushing 
them into place from the underside of the base 
plate.
2) Press down on the outer circumferences of 
the caps to ensure that they have been 
inserted tightly.
(Water leaks may result if the caps have not 
been inserted properly, if their outer 
circumferences lift up or the caps catch on or 
wedge against something.) 
Fig. 10-4-3
2. Install the drain nipple and a commercially 
av
ailable dr
ain 
hose 
(with 
16 mm inside 
diam
eter), and drain off the water.
(For the position where the drain nipple is 
installed, refer to the installation diagram of the 
indoor and outdoor units.)
• Check that the outdoor unit is horizontal, and 
route the drain hose at a downward sloped 
angle while ensuring that it is connected tautly. 
Do not use ordinary garden hose, but one can
flatten and prevent water from draining.
Fig. 10-4-4
Commercially available
drain hose
Base plate
Drain nipple