Hitachi RCI-1.0FSN3 Service Manual page 87

2 Unit installation
N O T E
• The total height of the unit is increased by around 55 mm when the outdoor air inlet duct (OACI-160K2) is ins-
talled. 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 standard maximum air volume of fresh air intake when using the total heat exchanger is within 20% of the rated air
volume of the indoor unit (at "HIGH" mode). In the case without total heat exchanger, use the fresh air intake kit within the
range which dewing does not occur at this kit, duct and inside the indoor unit.
With or without the total heat exchanger, follow the countermeasure according to the temperature difference between the
supply air from the room air and the outside air as shown in the table below.
Temperature Difference between Supply Air
from Room Air and Outside Air
Below 10 deg.
Below 15 deg.
Over 15 deg.
The outdoor air inlet duct resistance is indicated in the following figure. Use as a guide for fan selection.
N O T E
This chart showns the value when the kit is used by itself. In the case that the kit is installed with T-tube connec-
ting kit, refer the value to its the chart .
For RCI-FSN3Ei indoor units: OACI-232 or PD-75
The inlet of outdoor air is possible through the PD-75 (RCI, RCIM) or the OACI-232 (RCI) duct connection in the position
shown in the figure
75
SMGB0077 rev.0 - 01/2013
Pass Resistance of Fresh Air Intake Portion
60
6HP
40
Limit of Fresh
Air Intake Amount
20
0
0 1 2 3
0 2 4 6
Air Flow Volume (m
NOTES:
*1: For the connecting box at one side
*2: For the connecting box at both sides
Countermeasure
No Countermeasure Required
Perform Insulation
Use with Total Heat Exchanger or
Operation is Not Permissible.
4 *1
8 *2
/min.)
3
2