11
4. Coil frost prevention
The operation is as same as coil frost prevention during COOL operation.(Refer to 8-1.3.)
However when coil frost prevention works while the indoor fan is OFF, its speed becomes set speed.
8-3. FAN (
) OPERATION
<
MU-A07/A09/A12YV, MUX-A10/A19/A20/A22/A25/A26WV
>
(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select FAN mode with the OPERATION SELECT button.
(3) Select the desired fan speed. When AUTO, it becomes Low.
Only indoor fan operates.
Outdoor unit does not operate.
8-4. HEAT (
) OPERATION
<
MUH-A07/A09/A12YV, MXZ-A18/A26/A32WV
>
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31°C.
2. Indoor fan speed control
(1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Set temperature minus room temperature: 1.7 degrees or more·············································· High
Set temperature minus room temperature: Between 1 and 1.7 degrees ·································· Med.
Set temperature minus room temperature: less than 1 degree················································· Low
Initial temperature difference
Fan speed
Difference between room
temperature and set tem-
perature during operation
Operation time chart
Example
Thermostat
Indoor fan
Outdoor fan
Compressor
ON
8 min.
1 min.
4 min.
3 min.
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
(2) Cold air prevention control
1
When the compressor is not operating,
(
1
) if the temperature of indoor coil thermistor RT12 is 0°C or less, the fan stops.
(
2
) if the temperature of indoor coil thermistor RT12 is more than 0°C, the fan operates at Very Low.
2
When the compressor is operating,
(
1
) if the temperature of RT12 is 22°C or more, the fan operates at set speed.
(
2
) if the temperature of RT12 is less than 22°C and
(
1
) if the temperature of room temperature thermistor RT11 is 15°C or less, the fan stops.
(
2
) if the temperature of room temperature thermistor RT11 is more than 15°C, the fan operates at Very Low.
NOTE : If the temperature of RT12 reads from 18°C to 22°C at the air conditioner stating and also after defrosting,
this control works.
Released
Cold Air Prevention
18
:
22
:
Fan speed
Set speed
Very Low or stop
-0.3 deg.
0.3 deg.
Set temperature
Difference between room
temperature and set tem-
perature during operation
1. Thermostat control
Thermostat is ON or OFF by difference between room temperature and set temperature.
Initial temperature difference Thermostat
Room temperature minus set temperature : less than -0.3
:
··············································ON
Room temperature minus set temperature : 0.3
:
or more·················································OFF
1 deg. 1.7 deg.
3 deg.
OB329-1.qxp 03.12.3 1:16 PM Page 11
