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8. FUNCTIONS
8-1. Operation Functions
■ Functions of the main unit controller
1 OFF
: • Used to stop the unit when the remote
(Self-diagnostics)
controller is unavailable.
• Used when service inspection is performed.
2 ON
: • During normal operation: Starts operation
from the remote controller.
• Emergency operation: When the remote
controller is unavailable, moving this switch
from the OFF position to the ON position
starts automatic operation.
3 TEST
: • Used when operating performance are
checked.
• Used when pump-down is carried out.
(Operates at the rated frequency. At this
time, the main unit lamp flashes, and the
remote controller signal cannot be
received.)
4 DEMO
: • This function is for shop displays. Ordinarily
it is not used.
• Used during servicing.
■ Automatic operation
● Operating mode selection
When automatic operation is selected, the indoor and outdoor
temperature sensors function, and either HEAT, DRY, or COOL
mode operation is selected automatically.
Indoor temperature
15°C
(Approx.)
(Approx.)
22°C
20°C
18°C
● Desired-temperature memory
• The set temperature in the program can be changed as
desired within the range of ±4°C. This temperature can then
be stored. During automatic operation, press the temperature
setting buttons to change the temperature.
Set
temperature
22°C
27°C
(standard)
27°C
COOL
mode
DRY
Temperature
mode
at which
operation
starts
(Range:
20 – 26°C)
■ SENSOR DRY
During automatic operation, the system adjusts the room
temperature and fan speed according to the conditions in the
room, in order to maintain a comfortable room environment.
SENSOR DRY operation
• DRY operation is as shown in the figure below.
Load
COOL zone
A zone
B zone
Conditions are monitored at all
times when the room temperature
is below 15°C.
DRY A
The compressor operation frequency varies depending on the
relative humidity.
The indoor fan operates with 1/f fluctuation.
DRY B
The compressor operates at a low operating frequency.
The indoor fan operates with 1/f fluctuation.
Monitor
• Monitoring operation takes place when the room temperature
is below 15°C.
• When the monitoring range is entered, the compressor stops,
and the indoor fan operates at LL.
■ PAM-α control
• In order to further improve inverter performance, control is
switched between PWM control at low operation speeds, and
PAM control at high operation speeds, making the most
effective use of power.
25
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