Operating Tips; Heating Performance; Low Ambient Cooling; Group Control - Fujitsu AUT Series Operating Manual

TROUBLESHOOTING
Instructions relating to heating (*) are applicable only to "HEAT & COOL MODEL" (Reverse Cycle).
Doesn't operate at all:
CHECK ONCE
MORE
Poor Cooling (or *Heating)
performance:
If the problem persists after performing these checks, or if you notice burning smells, stop operation immediately, disconnect
the power supply, and consult with authorized service personnel.

OPERATING TIPS

Instructions relating to heating (*) are applicable only to "HEAT & COOL MODEL" (Reverse Cycle).

*Heating Performance

G This air conditioner operates on the heat-pump principle,
absorbing heat from outdoor air and transferring that heat
indoors. As a result, the operating performance is reduced as
outdoor air temperature drops. If you feel that insufficient
heating performance is being produced, we recommend you
use this air conditioner in conjunction with another kind of
heating appliance.
G Heat-pump air conditioners heat your entire room by
recirculating air throughout the room, with the result that some
time may be required after first starting the air conditioner until
the room is heated.
*When Indoor and Outdoor Tempera-
ture are High
G When both indoor and outdoor temperatures are high during
use of the heating mode, the outdoor unit's fan may stop at times.
Fan speed: AUTO
*Heating: The fan will operate at very low speed when the
temperature of the air issued from the indoor unit is low.
Cooling: As the room temperature approaches that of the set
temperature, the fan speed becomes slower.
Fan: The fan runs at the low fan speed.
*Microcomputer-controlled Automatic
Defrosting
G When using the Heating mode under conditions of low outdoor
temperature and high humidity, frost may form on the outdoor
unit, resulting in reduced operating performance.
In order to prevent this kind of reduced performance, this unit
is equipped with a Microcomputer-controlled Automatic
Defrosting function. During the defrost cycle, the indoor fan will
shutdown and will be displayed on the remote controller.
It will take anywhere from 4 to 15 minutes before the air
conditioner starts up again.
13
Symptom
G Has the circuit breaker been turned off?
G Has there been a power failure?
G Has a fuse blown out, or a circuit breaker been tripped?
G Is the timer operating?
G Is the air filter dirty?
G Are the air conditioner's intake grille or outlet port blocked?
G Did you adjust the room temperature settings (thermostat) cor-
rectly?
G Is there a window or door open?
G In the case of Cooling operation, is a window allowing bright sun-
light to enter? (Close the curtains.)
G In the case of Cooling operation, are there heating apparatus and
computers inside the room, or are there too many people in the
room?
G Is the unit set for QUIET operation?
Items to check

Low Ambient Cooling

G When the outdoor temperature drops, the outdoor unit's fans
may switch to Low Speed, or one of the fans may stop
intermittently.
*Hot start
The indoor unit prevents cold drafts when heating operation begins.
The indoor unit fan will not operate or it will operate at a very low speed
until the heat exchanger reaches the set temperature.
About ECONOMY OPERATION
At the maximum output, ECONOMY OPERATION is approximately 70%
of normal air conditioner operation for cooling and heating.
When ECONOMY OPERATION is performed during the cooling mode,
dehumidification is improved. This function is especially convenient when
you want to remove the humidity in the room without significantly lowering
the room temperature.
During ECONOMY OPERATION, the thermostat setting automatically
changes according to the temperature to avoid Unnecessary cooling
and heating for the most economical operation.
G If the room is not cooled (or heated) well during economy operation,
select normal operation.
G During the monitor period in the AUTO mode, the air conditioner
operation will not change to ECONOMY OPERATION even if
ECONOMY OPERATION is selected by pressing the ECONOMY button.
Dual Remote Controllers (optional)
An additional remove controller can be added up to the maximum of two
remote controllers. Either remote controller can control the air conditioner.
However, the timer functions cannot be used at the slave unit.

Group Control

One remote controller can control up to 16 air conditioners.
All of the air conditioners will be operated with the same settings.
See Page
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