Hitachi RCI-1.0FSN3 Service Manual page 88

2 Unit installation
This unit cannot take in outdoor air by itself and must be connected to a duct fitted with a fan and a control damper.
The duct must be controlled to ensure it only works when the unit
is running. The figure shows an example of electrical control.
N O T E
• The total height of the unit is increased by around 80 mm when the outdoor air inlet duct (OACI-232) is insta-
lled. Take this measurement into account when installing the unit.
• Use a cable with a three-terminal connector (PCC-1A) for the CN7 connector on the indoor PCB.
The maximum amount of incoming outdoor air is 20% of the air flow rate of the indoor unit. If the amount of incoming outdo-
or air exceeds this value, condensation may be produced on the inner surface of the drain pan (air inlet hole) and, in some
cases, dew may form. Always limit yourself to the values indicated in the figure below.
Nº
1 Duct (made of only non-combustible materials)
2 Thermal insulation (non-combustible materials)
Outdoor air inlet hood with gallery (attached drip-proof hood
3
type)
4 Air filter
5 Duct fan
6 Service panel
7 Damper
Fit an air filter to the suction side of the outdoor air inlet duct in a position that allows for easy maintenance operations.
Insulate the duct and its connection using fireproof insulating materials only.
N O T E
The parts shown in the above figure will be field-supplied.
Install an inspection panel -6- below the duct fan so that maintenance operations can be carried out on the air filter and
the damper.
Always use a damper and adjust the amount of air where a fan with a supply volume higher than the outdoor air inlet vo-
lume limit is used.
76
SMGB0077 rev.0 - 01/2013
Part