Hitachi RCI-1.0FSN3 Service Manual page 92

2 Unit installation

Branch pipe (PDF 23C3, PDF 46C3)
If there are obstacles such as partitions inside the room that
prevent the air from circulating correctly, branches can be installed
to provide an even air temperature.
Suitable return air grilles must be installed in line with the volume
of return air. If air conditioning is provided in an adjoining room,
always install a return grille.
Example of a branch pipe.
Branch pipe installation
The connections for the branch pipe are indicated in the following
figure.
There are six knockout holes. Cut the insulation material on the
outer surface in a circle and line up the notches at the four corners.
Use a screwdriver or similar and remove.
Prepare the square connection duct (field-supplied) or use a
flexible duct with a diameter of 150 or 200 mm.
Duct connection dimensions
Model
PDF-23C3
PDF-46C3
80
SMGB0077 rev.0 - 01/2013
Units
RCI-(1.0-2.5)FSN3Ei
RCI-(3.0-6.0)FSN3Ei
a b
150 155
200 180
c d
9 248
6 298