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Cleaning And Care; Troubleshooting - Fujitsu AirStage ARUM30TLAV2 Operating Manual

Indoor unit (duct type)
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Temperature and humidity range
● The temperature and humidity required for operating this product is as
shown in the following table.
Cooling/Dry Mode
Please refer to the specifi cation of outdoor units.
About 64 to 90 °F DB
(18 to 32 °C DB)
Indoor humidity
About 80% or less
● If the air conditioner is operated under higher temperature conditions
than those listed, the built-in protection circuit may operate to prevent
internal circuit damage. Also, during Cooling and Dry modes, if the unit
is used under conditions of lower temperature than those listed above,
the heat-exchanger may freeze, leading to water leakage and other
● If the unit is used for long periods under high-humidity conditions,
condensation may form on the surface of the indoor unit, and drip onto
the fl oor or other objects underneath.
● Do not use this unit for any purposes other than the Cooling, Heating,
Dehumidifying, and air-circulation of rooms in ordinary dwellings.


● Before cleaning the unit, be sure to stop the unit and disconnect the
power supply.
● Do not stand on an unstable platform when cleaning.
● When removing and replacing the air fi lters, be sure not to touch the
heat exchanger, as personal injury may result.
● Do not clean the inside of the unit by yourself. To clean the inside,
always consult authorized service personnel.
● When cleaning the unit's body, do not use water hotter than 104°F
(40 °C) , harsh abrasive cleansers, or volatile agents like benzene or
● If dirt is allowed to accumulate on the air fi lter, airfl ow will be reduced,
lowering operating effi ciency and increasing noise.
During periods of normal use, the air fi lters should be cleaned regu-
Cleaning the Air Filter
Cleaning the Air fi lter
Remove dust with a vacuum cleaner or by washing. After washing, be
sure to allow it to dry thoroughly in a shady place before reinstalling.
When not using for an extended period
Leave the breaker on for at least 12 hours before starting operation when
it is to be used again.


The following conditions are not breakdowns or op-
eration failures.
Doesn't operate immediately:
● If the unit is stopped and then immediately started again, the com-
pressor will not operate for about 3 minutes, in order to prevent fuse
● Whenever the electrical breaker is turned off then on again, the protec-
tion circuit will operate for about 3 minutes, preventing unit operation
during that period.
Heating Mode
About 50 to 86 °F DB
(10 to 30 °C DB)
Airfl ow is weak or stops:
● When Heating operation is started, indoor unit's fan may temporarily
stop, to allow internal parts to warm up.
● During Heating operation, if the room temperature rises above the
thermostat setting, the outdoor unit will stop, and the indoor unit's fan
will stop. If you wish to warm the room further, set the thermostat for a
higher setting.
● During oil recovery operation, the airfl ow may stop for approximately
10 minutes. (See page 2.)
● During Heating operation, the unit will temporarily stop operation (be-
tween 4 and 15 minutes) as the Automatic Defrosting mode operates.
(See page 2.)
● The fan may operate at low speed during Dry operation or when the
unit is monitoring the room's temperature.
● In the monitor AUTO operation, the fan will operate at low speed.
Flashing lamps:
(Limited to only when receiver unit is connected)
● The OPERATION indicator lamp (green) fl ashes:
An oil recovery operation is being performed. (See page 2.)
● The OPERATION indicator lamp (green) fl ashes:
An automatic defrosting operation is being performed. (See page 2.)
● The OPERATION indicator lamp (green) and TIMER indicator lamp
(orange) are fl ashing alternately:
It has recovered from a power outage.
● The OPERATION indicator lamp (green) and TIMER indicator lamp
(orange) are fl ashing simultaneously:
It is operating in trial operation mode. Ask a manager as there may be
maintenance being conducted.
● The OPERATION indicator lamp (green) lights up and the TIMER
indicator lamp (orange) fl ashes:
This is the standby state. (See page 2.)
Noise is heard:
● In the following conditions there are sounds of water fl owing from the
indoor unit and the operation sound becomes loud. These are the
sounds of the fl owing of refrigerant.
When operation starts
When oil recovery operation fi nishes
When automatic defrosting operation fi nishes
● During operation, a slight squeaking sound may be heard. This is the
result of minute expansion and contraction of the panel due to tem-
perature changes.
● During Heating operation, a sizzling sound may be heard occasionally.
This sound is produced by the Automatic Defrosting operation. (See
page 2.)
● Some smell may be emitted from the indoor unit. This smell is the
result of room smells (furniture, tobacco, etc.) which have been taken
into the air conditioner.
Fog comes out of the indoor unit:
● During Cooling operation, a thin mist may be seen emitted from the
indoor unit. This results from the sudden Cooling of room air by the air
emitted from the air conditioner, resulting in condensation and mist-
Steam comes out of the indoor unit:
● During Heating operation, the outdoor unit's fan may stop, and steam
may be seen rising from the unit. This is due to the Automatic Defrost-
ing operation. (See page 2.)
Water is produced from the outdoor unit:
● During Heating operation, water may be produced from the outdoor
unit due to the Automatic Defrosting operation.
The following conditions may not be breakdowns so
check again.
Doesn't operate at all:
● Has there been a power failure?
● Has a fuse blown out, or a circuit breaker been tripped?
● Is the main power switch set to the OFF position?
● Are you trying to engage in an operation diff erent from the priority
state? (See page 2.)
● Is it in standby state? (See page 2.)



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