Function of Indoor Unit (RA Models) SiBE121021_C
102 Function and Control
1.15 Other Functions
1.15.1 Hot-Start Function
In order to prevent the cold air blast that normally comes when heating operation is started, the
temperature of the indoor heat exchanger is detected, and either the airflow is stopped or is
made very weak thereby carrying out comfortable heating of the room.
*The cold air blast is also prevented using a similar control when the defrosting operation is
started or when the thermostat is turned ON.
1.15.2 Signal Receiving Sign
When the indoor unit receives a signal from the remote controller, the unit emits a signal
receiving sound.
1.15.3 Indoor Unit ON/OFF Button
An ON/OFF button is provided on the display of the unit.
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Press this button once to start operation. Press once again to stop it.
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This button is useful when the remote controller is missing or the battery has run out.
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The operation mode refers to the following table.
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In the case of multi system operation, there are times when the unit does not activate with
this button.
ex. Wall mounted type FTXS series 20-50 class
<Forced operation>
Forced operation can be started by pressing the ON/OFF button for 5 to 9 seconds while the
unit is not operating.
Refer to page 440 for detail.
Note: When the ON/OFF button is pressed for 10 seconds or more, the forced operation is stopped.
1.15.4 Titanium Apatite Photocatalytic Air-Purifying Filter
This filter combines the Air-Purifying Filter and Titanium Apatite Photocatalytic Deodorizing
Filter as a single highly effective filter. The filter traps microscopic particles, decomposes odors
and even deactivates bacteria and viruses. It lasts for 3 years without replacement if washed
about once every 6 months.
1.15.5 Photocatalytic Deodorizing Filter
The photocatalytic deodorizing filter powerfully decomposes odor of tobacco, pet, etc. The
deodorizing power is regenerated simply by being exposed to the sunshine. It is recommended
to dry the filter in the sun for about 6 hours (after vacuuming the filter) every 6 months.
1.15.6 Air-Purifying Filter
The air-purifying filter collects tobacco smoke, pollen, etc. with electrostatic agency.
This filter includes a deodorizing active carbon filter that removes minute particles of odor.
Replace the air-purifying filter every 3 months.
Mode Temperature setting Airflow rate
Cooling Only COOL 22°C Automatic
Heat Pump AUTO 25°C Automatic
(R8302)
ON/OFF button
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