Usage
The fresh air and filter chamber is used as the filter chamber.
Fresh air intake by using the fresh air and filter chamber and
fresh air inlet box.
Usage as the filter chamber
In case the optional filter is used, air volume may decrease. This can cause decrease temperature
of cooling air flow and dew drop. Therefore, be sure to change DC fan tap setting
by main wired remote controller.
(Setting change should be performed according to the installation manual provided
with the optional filter. To install the super long life filter, change the setting data to 0001.
To install the high efficiency filter, change the setting data to 0003.
1. Be sure to provide air return.
2. The fresh air shall be treated by heat reclaim ventilator or the like.
3. Recommended treated air temperature is 12C to 30C.
4. Be sure to decide the fresh air volume so that mixed suction air with fresh air keep
operating temperature.
Provide an air filter in fresh air way to prevent sucking dust.
6. Be sure to insulate the fresh air duct.
In order to accelate starting up in heating mode, implement pre-heating operation
by cutting off fresh air intake.
Up to 20% fresh air intake ratio is available by using the booster fan.
fresh air intake ratio = ( fresh air volume ) / ( total air volume ) X 100 %
Inter - lock circuit
1. Connect the driving relay of the duct fan ( DC 12 V ) between 1 and 6
on the indoor P.C.board.
Part indicated with a bold line is the connecting circuit.
After installation, implement a trial operation to check that the duct fan of the
indoor unit start / stop simultaneously.
(Implement the trial operation following to the installation manual of the indoor unit.)
Rated current of the relay for duct fan shall be up to 75 mA .
Duct fan motor
AC220
to 240V
CN60
(White)
Indoor
P.C.board
Relay for
duct fan
Closed and
terminal
Closed and
terminal
Booster fan
P
1
P
(Atmospheric)
Fresh
Chamber
Static Pressure = P
(atmospheric)
- P
1
7. Fresh air intake ( design guide )
Characteristics between air volume of branching duct and static pressure
Caution
7
0
50
100
150 200
250
300 350 400
300
250
200
150
100
50
0
-50
St
at
ic
P
re
ss
ur
e
(P
a)
Fresh Air Volume (m3/h)
Air
