Toshiba RAS-M10GDCV-E Service Manual page 16

2. Prevent-freezing control
If temperature of indoor heat exchanger detected
by the indoor heat exchanger sensor is 4°C or
lower, compressor motor speed is gradually
lowered to prevent freezing of the indoor heat
exchanger. If temperature is 6°C or higher, return
the operation to the above item 1.
3. Limit for maximum compressor motor
speed by indoor fan speed
When outdoor temperature sensor detected 32°C
or lower, and indoor heat exchanger sensor
detected 15°C or lower, the maximum compres-
sor motor speed is limited by the indoor fan
speed.
8-2-3. DRY Operation
(The Remote controller MODE Button
is Set to the DRY Position)
• Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply by
pushing [START/STOP] button.
• Dry operation signal is transmitted to outdoor unit.
• The Cooling operation giving priority to dehumidify-
ing, which restrains the indoor fan speed and
compressor motor speed, is performed.
• The indoor fan motor operates as shown in Fig. 8-
2-3. (Fan speed is AUTO only.)
• The outdoor unit controls the outdoor fan relay and
the compressor motor speed according to the
operation command signal sent from the indoor
unit.
+2.5
+2.0
+1.5
+1.0
+0.5
Set
0
temp.
–0.5
NOTE :
1 : Middle motor speed between L– and UL
*
Fig. 8-2-3 Setting of air flow
1. Dehumidifying-preferential Cooling capac-
ity 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 tempera-
ture sensor and the temperature set by TEMP
button and also any change in room tempera-
ture.
• When the air conditioner operates in Dry mode,
the maximum compressor motor speed is
restricted.
While multiple indoor units operate, compressor
motor speed is calculated in the outdoor unit to
operate.
• When room temperature is lower than set
temperature, indoor fan motor is operated at fan
speed UL as shown in Fig. 8-2-3 while the
outdoor unit stops.
• 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.
8-2-4, 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 tem-
perature when air flow is AUTO (Fig. 8-2-5) and
starting of FAN Manual.
[Basic control]
L–
Set
temp.
*1
UL
NOTE :
1, 2 : Approximate revolution speed of M+ and L to
* *
– 16 –
(Heat pump model only)
0
–0.5
–1
–1.5
–2
–5.0
–5.5
[FAN AUTO]
linear according to temperature.
Fig. 8-2-4 Setting of air flow
LOW
1
*
2
*
M+
HIGH