Fujitsu UTY-LNHUM Operating Manual page 16

OPERATING TIPS
AUTO Restart
In Event of Power Interruption
● The power supply to the air conditioner is stopped by a power
interruption. The air conditioner will then restart automatically
in its previous mode when the power is restored.
Simultaneous Use of Multiple Units
● When using a multi-type air conditioner, the multiple indoor
units can be operated simultaneously, but when two or more
indoor units of the same group are operated simultaneously,
the heating and cooling effi ciency will be less than when
a single indoor unit is used alone. Accordingly, when you
wish to use more than one indoor unit for cooling at the
same time, the use should be concentrated at night and
other times when less output is required. In the same way,
when multiple units are used simultaneously for heating, it
is recommended that they be used in conjunction with other
auxiliary space heaters, as required.
● Seasonal and outdoor temperature conditions, the structure
of the rooms and the number of persons present may also
result in differences of operating effi ciency. We recommend
that you try various operating patterns in order to confi rm the
level of heating and cooling output provided by your units,
and use the units in the way that best matches your family's
lifestyle.
● If you discover that one or more units delivers a low level of
cooling or heating during simultaneous operation, we recom-
mend that you stop simultaneous operation of the multiple
units.
● Operation cannot be done in the following different operating
modes.
If the indoor unit is instructed to do an operating mode that
it cannot perform, the OPERATION Indicator Lamp (green)
on the indoor unit will fl ash (1 second on, 1 second off) and
the unit will go into the standby mode.
Heating mode and cooling mode (or dry mode)
Heating mode and fan mode
NOTES
• During use of the heating mode, the outdoor unit will occasionally commence the defrost operation for brief periods. During the
defrosting operation, if the user sets the indoor unit for heating again, the defrosting mode will continue, and the heating operation
will begin after completion of defrosting, with the result that some time may be required before warm air is emitted.
• During use of the heating mode, the top of the indoor unit may become warm, but this is due to the fact that coolant is circulated
through the indoor unit even when it is stopped; it is not a malfunction.
En-15
● If a power interruption occurs during TIMER operation, the timer
will be reset and the indoor unit will begin (or stop) operation at
the new time setting. In the event that this kind of timer fault oc-
curs, the TIMER Indicator Lamp will fl ash.
● Use of other electrical appliances (electric shaver, etc.) or
nearby use of a wireless radio transmitter may cause the air
conditioner to malfunction. In this event, temporarily turn off the
circuit breaker, turn it on and then use the Remote Controller
to resume operation.
● Operation can be done in the following different operating
modes.
Cooling mode and dry mode
Cooling mode and fan mode
Dry mode and fan mode
● The operating mode (heating mode or cooling (dry) mode)
of the outdoor unit will be determined by the operating mode
of the indoor unit that was operated fi rst. If the indoor unit
was started in fan mode, the operating mode of the outdoor
unit will not be determined.
For example, if indoor unit (A) was started in fan mode and
then indoor unit (B) was then operated in heating mode,
indoor unit (A) would temporarily start operation in fan mode
but when indoor unit (B) started operating in heating mode,
the OPERATION Indicator Lamp (green) for indoor unit
(A) would begin to fl ash (1 second on, 1 second off) and it
would go into standby mode. Indoor unit (B) would continue
to operate in heating mode.