P5414964-rev.1
13
7. Automatic Control
The system is equipped with the following
functions.
NOTE
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Three Minute Guard (Enforced Stoppage)
The compressor remains off for at least 3
minutes once it has stopped. If the system is
started within approximately 3 minutes after it
has stopped, the RUN indicator is activated.
However, the cooling operation or the heating
operation remains off and does not start until
after 3 minutes has elapsed.
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Three Minute Guard (Enforced Operation)
If all indoor units of the system are Thermo-OFF
within approximately 3 minutes after compressor
has started, compressor is operated during 3
minutes continuously.
However, if all indoor units of the system are
stopped by remote control switch, compressor is
stopped.
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Oil Return Operation
If an indoor unit is stopped more than 2 hours
continuously, this function is operated during a
few minutes.
It has this function to prevent to accumulate in
the heat exchanger of stoppage indoor unit at
cooling operation.
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Frost Prevention During Cooling Operation
When the indoor unit is operated at low
discharge air temperature, the cooling operation
may be changed to fan operation for a while
to avoid frost formation on the indoor heat
exchanger.
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Self-Cleaning Expansion Valve
It is for self cleaning the expansion valve when
the operation is stopped at cooling.
The sound which the refrigerant ows may
be heard from the indoor unit during the self-
cleaning. However it is not abnormal.
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Hot Start During Heating Operation
To prevent cold air discharge in the room, the
fan speed is controlled from the slow position
and the low position and then to the set position
according to the discharge air temperature.
At this time the louver is xed horizontally.
Except for a long period of shutdown, keep the
main power switch ON. The drain discharge
mechanism is operated if the drain level is higher
than the setting.
6.2 In Abnormal Condition
6.2.1 Abnormality
• The RUN indicator (Red) is ashing.
• The indoor unit number, the alarm code, the
model code, *model name (Ex. RCI-3.0FSN3)
and the connected number of indoor units are
displayed on LCD.
(*The unit model name is only displayed for the
corresponding unit model.)
• In case that the plural indoor units are
connected to one remote control switch, the
above abnormality informations for each indoor
unit are displayed one by one.
6.2.2 Power Failure
• All the indications are OFF.
• Once the unit is stopped by the power failure,
the unit will not be started again although
the power recovers. Perform the starting
procedures again.
• In case of instantaneous power failure within
2 seconds, the unit will be started again
automatically.
6.2.3 Electric Noise
There could be a case that all the indications are
OFF and the unit is stopped. This is occurred by
the activation of the micro computer for the unit
protection from the electric noise.
Perform the starting procedures again.
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