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5.2 Operating the System
5.2.1 System operation
The operating program varies with different combina-
tions of outdoor unit and controller.
To protect this unit, turn on the main power supply 12
hours before operation.
If there is a power outage while the unit is running, the
unit will automatically restart its operation when the
power supply resumes.
5.2.2 Cooling, heating, fan only
and auto operations
The indoor units in the air conditioner can be controlled
separately, but the indoor units in the same refrigerant
system cannot operate in the heating and cooling
modes at the same time.
When the cooling and heating modes conflict, the mode
is determined based on the setting of the " Menu mode"
of the outdoor unit.
Table 5.2
Automatic
Automatic selection of heating or
priority mode
cooling priority based on the ambient
temperature.
When you select the cooling mode as
Cooling
the priority mode, the heating
priority mode
operations in the indoor unit stops
running, while the cooling mode will
operate as usual;
If the VIP indoor unit has been set and
turned on, the operating mode of VIP
VIP priority
indoor unit will be regarded as the
mode
priority operating mode of the system. If
or voting
the VIP indoor unit has not been set or
priority mode
not turned on, the mode adopted by
most indoor units at the same time will
be the priority operating mode of the
system.
Indoor units with the heating mode will
In response
operate normally, while indoor units in
to heating
the cooling or fan mode will display the
mode only
"dd".
Indoor units in the cooling and fan
In response
modes will operate normally, while
to cooling
indoor units in the heating mode will
mode only
display the "dd".
Indoor units in the cooling or fan mode
Heating
will stop running, while indoor units in
priority mode
the heating mode will run as usual.
When set the VIP indoor unit,the
operation mode of non-VIP indoor unit
Change over
cannot be selected by controllers
even the outdoor unit is stop running.
The mode adopted by most indoor
Voting priority
units at the same time will be the
mode
priority operating mode of the system.
First on
The operating mode of the first running
priority mode
Indoor unit will be regarded as the
priority operating mode of the system.
Capability
The mode adopted by the greater
requirements
demand of indoor units at the same
priority mode
time will be the priority operating mode
of the system.
5.2.3 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 the heating operation, as the outdoor temperature
decreases, frost may be formed on the heat exchanger
in the outdoor unit, making it more difficult for the heat
exchanger to heat up the air. The heating capacity
decreases, and a defrosting operation needs to be
performed on the system in order for the system to
provide sufficient heat to the indoor unit. At this point,
the indoor unit will show "dF" on the display screen.
The indoor fan motor will automatically stop running so
as to prevent cold air from coming out of the indoor unit
when the heating operation starts. This process will
take some time. This is not a malfunction.
INFORMATION
i
In heating mode, the air-conditioning system
absorbs heat from the outdoor air and
releases heat to the indoor side. When the
outdoor temperature is low, less heat is
released. This is the principle of heat pump.
When the outdoor temperature is extremely
low,
the
heating
conditioner decreases, and other heating
equipment may need to be added.
5.2.4 To operate the system
Press the operation mode selector button on the user
interface and select the operation mode.
Press the ON/OFF button on the user interface.
Result: The running light turns on and the system starts
to run.
Stop
Press the ON/OFF button on the user interface.
Result: The running light is off, and the system stops
running.
NOTE
Once the unit has stopped running, do not
disconnect the power immediately. Wait for at
least 10 minutes.
Adjust
Refer to the user manual for the controller on how to set
the required temperature, fan speed and air flow
direction.
5.3 Dry Program
5.3.1 System operations
The function in this program uses the minimum
temperature drop (minimum indoor cooling) to bring
about a drop in humidity in the room.
The temperature and fan speed cannot be set.
capacity
of
the
air
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