7
3-3
Duct for fresh air
There is a duct connection port
for drawing in fresh air.
The supplementary fan motor for outside air intake has to be supplied separately and controlled by a bipolar ON-
OFF switch with safety fuses.
Fresh air flow must be about 10% of the total air flow to avoid operating problems and noise.
• Open the knock-out hole
, fix a
70 mm flange on the unit and connect the thermically insulated duct.
• Install an outside grille with filter inspection port to prevent dust and leaves from entering and fouling the indoor
unit heat exchanger.
Fig. 3-9
Fig. 3-4
Fig. 3-5
Fig. 3-6
Fig. 3-7
Fig. 3-8
