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2 Unit installation
Optional accessories
SMGB0099 rev.0 - 12/2016
79
2
2.13 Optional accessories
2.13.1 Outdoor air inlet
Outdoor air inlet duct connection position
This kit can not supply the fresh air by itself. Therefore,
connect the duct and supply the fresh air from the total
heat exchanger or the duct fan.
When connecting this kit to the total heat exchanger or the
duct fan, make an interlock to the fan of the indoor unit.
The example is shown below.
Use a cable with a three-terminal connector (PCC-1A) for
the CN7 connector on the indoor PCB.
CN7
1
2
RY
52F
AC
RYa
Indoor Unit Printed Circuit Board
Total Heat Exchanger
or Magnetic Switch
Auxiliary Relay
Total heat exchanger
or magnetic switch
Indoor unit printed circuit board
Auxiliary relay
Remarks for OACI-160K2, OACI-232 and OACI-232E
The standard maximum air volume of fresh air intake when using the outdoor air inlet duct references OACI-160K2 or
OACI-232 or OACI-232E combined with a total heat exchanger or the duct fan, is within 20% of the rated air volume
of the indoor unit (at “HIGH” mode). If the amount of incoming outdoor 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.
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
Countermeasure
Below 10 deg.
No countermeasure required
Below 15 deg.
Perform insulation
Over 15 deg.
Use with total heat exchanger or
Operation is not permissible.
The outdoor air inlet duct references OACI-160K2, OACI-232 or OACI-232E resistance data, is indicated in the following
figure. Use as a guide for fan selection.
Pass resistance (Pa)
Air flow volume (m
3
/min.)
Limit of fresh air intake amount with
OACI-160K2 or OACI-232 accessory
?
N O T E
• This chart shows the value when the kit OACI-160K2,OACI-232 or OACI-232E is used by itself. In the case that the kit is installed with
the T-tube connecting kit, refer the value to its chart .
•
(*1) When connecting OACI-160K2, OACI-232 or OACI-232E with1 duct adapter.
•
(*2) When connecting OACI-160K2, OACI-232 or OACI-232E with 2 duct adapter.