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17. Programming time button
Use this button for setting the programming start
and/or stop time.
18. Temperature setting button
Use this button for setting the desired temperature.
19. Filter sign reset button
Refer to the operation manual of indoor unit.
20. Fan speed control button
Press this button to select the fan speed of your
preference.
21. Operation mode selector button
Press this button to select the operation mode of
your preference.
22. Air flow direction adjust button
Refer to the chapter “Operation procedure -
Adjusting the air flow direction”.
23. Fan only/air conditioning selector switch
Set the switch to “
” for fan only operation or to
“
” for heating or cooling operation.
24. Cool/heat changeover switch
Set the switch to “
” for cooling operation or to
“
” for heating operation.
25. Thermistor
It senses the room temperature around the
remote controller.
26. These button are used when the total heat
exchanger unit (Heat Reclaim Ventilation) are
installed. (These are optional accessories.)
Refer to the operation manual of the total heat
exchanger unit (Heat Reclaim Ventilation).
27. No function display
• If a function is not available in the indoor unit
even if the button is pressed, “NOT AVAIL-
ABLE” is may be displayed for a few seconds.
• When using multiple units at the same time.
“NOT AVAILABLE” is only displayed when
none of the indoor units is equipped with that
function.
If even one of the indoor units has the function,
it will not be displayed.
NOTE
• In contradistinction to actual operating situations,
the display on figure 2 shows all possible indica-
tions.
• Figure 2 shows the remote controller which is
opened the cover.
• The remote controller BRC1A52
(for FXS, FXM, FXL, FXN) does not have the dis-
play air flow flap (4) nor the air flow direction
adjust button (22).
4. OPERATION RANGE
If the unit is operated under the following conditions,
the safety device may be activated and the unit
becomes not operational or condensed water drops
from an indoor unit.
*This value shows a quantity of water per one outside unit.
NOTE
To avoid condensation and water dripping out the unit.
If the temperature or the humidity is beyond these
conditions, safety devices may work and the air con-
ditioner may not operate.
5. OPERATION PROCEDURE
• Operation procedure varies according to the com-
bination of BS unit and remote controller. Read
the chapter “What to do before operation”.
• To protect the unit, turn on the main power switch
6 hours before operation.
And do not turn off the power supply during the air
conditioning season because of smoothly start up.
• If the main power supply is turned off during oper-
ation, operation will restart automatically after the
power turns back on again.
5-1 COOLING, HEATING, AUTOMATIC AND
FAN ONLY OPERATION
• Automatic operation can be selected only on the
heat recovery system.
• The operation mode cannot be changed with the
remote controller whose display shows
“
” (changeover under control).
Change the operation mode with the remote con-
troller whose display does not show “
”.
• When the display “
” (changeover under
control) flashes, refer to the chapter “Operation
procedure - Setting the master remote controller”.
• The fan may keep on running for about 1 minute
after the heating operation stops for removing the
heat in the indoor unit.
• The air flow rate may be ajusted automatically
depending on the room temperature or the fan
may stop immediately. This is not a malfunction.
• For machine protection the system may control
the air flow rate automatically.
• It may take sometime for finishing to change the
air flow rate.
This is normal operation.
COOLING
HEATING
Ambient temperature
around the outside unit
0°~40°C
Ambient humidity around
the outside unit
≤
80%
indoor temperature
21°~32°C
15°~27°C
Water temperature at the
inlet of the outside unit
10°~45°C
Water volume in the out-
side unit
50~150L/min*
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