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12.2 Indoor Unit 
12.2.1  How to Fix Installation Plate 
The mounting wall shall be strong and solid enough to 
prevent it from vibration. 
 
 
 
The center of installation plate should be at more than 
c at right and left of the wall. 
The distance from installation plate edge to ceiling 
should more than d. 
From installation plate left edge to unit’s left side is e. 
From installation plate right edge to unit’s right side is 
f. 
 
○
B   : For left side piping, piping connection for 
               liquid should be about g from this line. 
  : For left side piping, piping connection for gas 
               should be about h from this line. 
 
1  Mount the installation plate on the wall with 5 
screws or more (at least 5 screws).  
(If mounting the unit on the concrete wall, 
consider using anchor bolts.)  
o  Always mount the installation plate 
horizontally by aligning the marking-off 
line with the thread and using a level 
gauge. 
2  Drill the piping plate hole with ø70 mm hole-
core drill. 
o  Line according to the left and right side of 
the installation plate. The meeting point 
of the extended line is the center of the 
hole. Another method is by putting 
measuring tape at position as shown in 
the diagram above. The hole center is 
obtained by measuring the distance 
namely 128 mm for left and right hole 
respectively. 
o  Drill the piping hole at either the right or 
the left and the hole should be slightly 
slanting to the outdoor side. 
 
 
12.2.2  To Drill a Hole in the Wall and 
Install a Sleeve of Piping 
1  Insert the piping sleeve to the hole. 
2  Fix the bushing to the sleeve. 
3  Cut the sleeve until it extrudes about 15 mm 
from the wall. 
 
 CAUTION 
  
When the wall is hollow, please be sure to use the 
sleeve for tube assembly to prevent dangers caused 
by mice biting the connection cable. 
 
4  Finish by sealing the sleeve with putty or 
caulking compound at the final stage. 
 
 
 
12.2.3  Indoor Unit Installation