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12 Operation
12.2
Operating the system
12.2.1
About operating the system
▪ To protect the unit, turn on the main power switch 6 hours before
operation.
▪ If the main power supply is turned off during operation, operation
will restart automatically after the power turns back on again.
12.2.2
About cooling, heating, fan only, and
automatic operation
▪ The air flow rate may adjust itself depending on the room
temperature or the fan may stop immediately. This is not a
malfunction.
12.2.3
About the heating operation
It may take longer to reach the set temperature for general heating
operation than for cooling operation.
The following operation is performed in order to prevent the heating
capacity from dropping or cold air from blowing.
Defrost operation
In heating operation, freezing of the outdoor unit's air cooled coil
increases over time, restricting the energy transfer to the outdoor
unit's coil. Heating capability decreases and the system needs to go
into defrost operation to be able to remove frost from the outdoor
unit's coil. During defrost operation the heating capacity on the
indoor unit side will temporarily drop until defrosting is completed.
After defrosting, the unit will regain its full heating capacity.
The indoor unit will stop fan operation, the refrigerant cycle will
reverse and energy from inside the building will be used to defrost
the outdoor unit coil.
The indoor unit will indicate defrost operation on the display
Hot start
In order to prevent cold air from blowing out of an indoor unit at the
start of heating operation, the indoor fan is automatically stopped.
The display of the user interface shows
time before the fan starts. This is not a malfunction.
12.2.4
To operate the system
1 Press the operation mode selector button on the user interface
several times and select the operation mode of your choice.
Cooling operation
Heating operation
Fan only operation
2 Press the ON/OFF button on the user interface.
Result: The operation lamp lights up and the system starts
operating.
12.3
Using the dry program
12.3.1
About the dry program
▪ The function of this program is to decrease the humidity in your
room with minimal temperature decrease (minimal room cooling).
▪ The micro computer automatically determines temperature and
fan speed (cannot be set by the user interface).
▪ The system does not go into operation if the room temperature is
low (<20°C).
Installation and operation manual
14
12.3.2
To start
1 Press the operation mode selector button on the user interface
several times and select
2 Press the ON/OFF button of the user interface.
Result: The operation lamp lights up and the system starts
operating.
To stop
3 Press the ON/OFF button on the user interface once again.
Result: The operation lamp goes out and the system stops
operating.
12.4
Refer to the operation manual of the user interface.
12.4.1
For the following conditions, a micro computer controls the air flow
direction which may be different from the display.
▪ When the room temperature is
lower
temperature.
.
▪ When operating continuously at horizontal air flow direction.
▪ When continuous operation with downward air flow is performed
at the time of cooling with a ceiling-suspended or a wall-mounted
. It may take some
unit, the micro computer may control the flow direction, and then
the user interface indication will also change.
The air flow direction can be adjusted in one of the following ways:
▪ The air flow flap itself adjusts its position.
▪ The air flow direction can be fixed by the user.
▪ Automatic
12.5
Use active circulation airflow to heat or cool the room more quickly.
12.5.1
1 Set the active circulation airflow
To use the dry program
(program dry operation).
NOTICE
Do not turn off power immediately after the unit stops, but
wait for at least 5 minutes.
Adjusting the air flow direction
About the air flow flap
Double flow+multi-flow units
Cooling
▪ When starting operation.
than
the
set
▪ When the room temperature is
higher
temperature.
▪ At defrost operation.
and desired position
WARNING
Never touch the air outlet or the horizontal blades while the
swing flap is in operation. Fingers may become caught or
the unit may break down.
NOTICE
▪ The movable limit of the flap is changeable. Contact
your dealer for details. (only for double-flow, multi-flow,
corner, ceiling-suspended and wall-mounted).
▪ Avoid operating in the horizontal direction
cause dew or dust to settle on the ceiling or flap.
Active circulation airflow
To start the active circulation airflow
Heating
than
the
set
.
. It may
FCAG35~140BVEB
Split system air conditioners
4P535626-1C – 2019.09
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