– 57 –
(1) Dehumidifying-preferential Cooling capacity
control
• The cooling capacity and room temperature are
controlled by changing the compressor motor
speed according to both the difference between
the temperature detected by the room temperature
sensor and the temperature set by TEMP button
and also any change in room temperature.
• When the air conditioner operates in Dry mode, the
maximum compressor motor speed is restricted.
M10 : Max. 20 rps
M13 : Max. 20 rps
M16 : Max. 22 rps
While multiple indoor units operate, compressor
motor speed is calculated in the outdoor unit to
operate.
• When room temperature is lower than set tempera-
ture, indoor fan motor is operated at fan speed SUL
as shown in Fig. 8-2-6 while the outdoor unit stops.
• ECONO. mode cannot be set.
• Other controls than the above-mentioned controls
are common to those of Cooling operation.
8-2-4. Heating Operation
Transferring of heating operation signal from indoor
unit to outdoor unit starts.
The indoor fan motor operates by the room tempera-
ture when selecting “AUTO” of “FAN” as shown in
Fig. 8-2-7, and operates with a set air flow when
selecting “Low” to “High”.
However, to prevent cold draft, revolution speed of
the fan is restricted by indoor heat exchanger when
air flow is AUTO (Fig. 8-2-8) and starting of FAN
Manual.
[Basic control]
0
–0.5
–1
–1.5
–2
–5.0
–5.5
(Room temp
.)
–
(Set temp
.)
Set
temp.
[FAN AUTO]
*
2
*
1
LOW
M+
HIGH
33
*
3
*
2
32
44
43
20
19
31
30
A
A – 8
A + 4
A – 8
HIGH
SUL
SUL
FAN
AUTO
Starting
of FAN
Manual
Approximate
revolution speed
of HIGH and SUL
linear by Tc.
Stop
( NOTE :
*
1)
*
1,
*
2 : Approximate revolution speed of M+ and L to
linear according to temperature.
Fig. 8-2-7 Setting of air flow
Fig. 8-2-8 Cold draft preventing control
NOTES :
(1) Stops for 2 minutes after thermostat-OFF.
(2) 24°C when the set temp. is 24°C or more
Set temp. when the set temp. is below 24°C
(3) SUL : Super ultra low
[In starting and in stability]
[Cold draft preventing control]
The upper limit of fan revolution speed is shown
below.
FAN
AUTO
FAN
Manual
In starting
• Until 12 minutes
passed after
operation start
• When 12 to 25
minutes passed
after operation start
and room temp. is
3°C or lower than
set temp.
• Room temp.
≤
Set temp. –4°C
In stability
• When 12 to 25
minutes passed
after operation start
and room temp. is
higher than (set
temp. –3°C)
• When 25 minutes or
more passed after
operation start
• Room temp. >
Set temp. –3,5°C
The outdoor unit controls the outdoor fan based
upon the operation signal sent from the indoor unit,
and also controls revolution speed of the compres-
sor motor.
The power coupler (IC20) for four-way valve is
turned on, and turned off in defrost operation.
(1) Heating capacity control
Calculate the difference between temperature
detected by room temp. sensor every minute and
the set temp. set on “Temp. indicator” and
variation amount of room temp.
Then, obtain the correction amount of the
command signal, and correct the current fre-
quency command signal.
