Air Conditioner Service Manual
5
of compressor is controlled by electronic controller. When room temperature is much higher than
set temperature, the compressor will start at a high frequency, and as room temperature goes
down, the compressor running frequency will go down. When room temperature is lower than set
temperature,
the c
ompressor will run at very low frequency. In general, unit will change its running
frequency according to
δt
to make room temperature closing to set temperature.
(2)
Outdoor temperature affects running frequency of the compressor
Outdoor temperature affect compressor’s running frequency. Difference inlet temperature of
outdoor unit is adapted by difference compressor running frequency. While outdoor temperature is
about 30
℃
, the compressor will run in high frequency.
If unit run in “cooling” mode and outdoor temperature is less than -2
℃
,
the
controller will shut
down compressor and show error code, while the ambient temperature is over 1
℃
,
the compressor
will run automatically
.
(3)
Auto fan control in cooling mode
In cooling mode (include cooling in “Feel” mode), fan speed is determined by
δt
, as the
following diagram:
4.“DRY” Mode Operation
(1)
The system for DRY operation used the same refrigerant circle as the cooling one.
(2)
When the system operates in DRY mode, at first it operates in cooling mode, the set
temperature (
ST
) is “RT-2
℃
”
. After that, t he system will operate in cooling mode with
lowest fan speed. During the course of this operation, you can’t use remote controller to adjust
the fan speed but you can control the vane direction.
(3)
In the dry mode, when RT≤12
℃
, the compressor will stop and operates again at RT
≥
14
℃
.
5. “HEATING” Mode Operation (available for Heat Pump only)
(1)
Frequency control
Same as the frequency control in cooing mode, the running frequency of compressor is
controlled by controller. Unit change its running frequency according to
δt
to make the room
temperature closing to the set temperature.
(2)
Indoor fan motor control
1)
Cold Air Prevention C
ontrol
⚫
The function is intended to prevent cold air from being discharged when heating mode
selected or while in defrosting.
⚫
The indoor fan speed will be controlled as following.
⚫
In heating operation, if air conditioner turn off, the indoor fan motor will run most for 30
RT-ST
℃
4.0
3.0
1.5
1.0
δt come down
δt come up
High fan
Min fan
Low fan
Breeze
Temperature up
Temperature down
Setting
Low fan
Stop
37
℃
33
℃
25
℃
33
℃
25
℃
20
℃
Indoor pipe Temperature