Service Manual
26
Technical Information
fan motor operates at low speed.
◆
When Tamb.
＜
Tset-2
℃
, the compressor and the ODU fan motor stop, while the IDU fan motor runs at low speed.
In drying mode, the 4-way valve is de-energized (4-way valve is not available for cooling only unit); Temperature setting range is
16
～
30
℃
. Fan speed can’t be adjusted.
②
Protection functions (See function protection of this section)
(4)Heating mode(heating mode is not available for cooling only uni)
①
Operation condition and process
◆
When Tamb.≤Tset-1
℃
, the system starts heating operation. In this case, the 4-way valve is energized. The compressor and the
ODU fan motor operates simultaneously; The IDU fan motor will be started up after delayed for a period of time to make sure the air
conditioner won’t blow out cold wind.
◆
When Tpreset-1
℃＜
Tamb.
＜
1
℃
, the system keeps previous operation status.
◆
When Tamb.≥1
℃
, the compressor and the ODU fan motor stop. The 4-way valve is energized all the time. The IDU fan
motor will blow residual heat after operating at set speed for a period of time consecutively to make sure the inner temperature of air
conditioner won’t be too high.
In heating mode, 4-way valve is energized. Temperature setting range is 16
～
30
℃
.
②
Defrosting condition and process
In order to ensure heating effect, the unit will proceed defrosting automatically according to the frost situation of outdoor unit. Dual-8
nixie tube displays H1 during defrosting. (For some models, heating icon is bright for a period of time and then OFF).
③
Protection functions (See function protection of this section)
(5) Fan mode
①
Operation condition and process
The IDU fan motor operates at set speed, while the compressor, the ODU fan motor and 4-way valve stop.
②
Protection functions (See function protection of this section)
10S
20S
10S
T
preset
+1
T
preset
-1
Stop heating
Original operating status
Start heating
valve
Outdoor unit
Intdoor unit
Compressor
min.
min.
min.
T
amb
.
.
n
i
m
.
n
i
m
Set fan speed
Set fan speed
Reversing
T
preset
T
amb.
+2
T
preset-
2
Cooling
Drying
Stop
6 min
6min.
4min.
4min.
Compressor
Low speed
Outdoor fan motor
Indoor fan motor
