18
Technical Information
Service Manual
6.2 Brief Description of Modes and Functions
1Temperature Parameters
ƹ
Indoor preset temperature (Tpreset)
ƹ
Indoor ambient temperature (Tamb.)
2 Basic Functions (The temperature in this manual is expressed by Centigrade. If Fahrenheit is used, the switchover
between them is Tf=TcX1.8+32.)
Once the unit is energized, the compressor shall never be restarted except 3mins interval at least. For the first energization,
if the unit is at off status before power failure, the compressor can be restarted without 3-min delay. But if the unit is at on
status before power failure, the compressor shall be restarted with 3mins delay. Once the compressor is started up, the
compressor won't stop running within 6mins with the change of room temperature.
(1) Cooling mode
ķ
Cooling conditions and process
When Tamb. ≥1
ć
, the unit starts cooling operation. In this case, the compressor and the outdoor fan operate and
the indoor fan operates at set speed.
When Tamb. ≤Tpreset-1
ć
, the compressor and the outdoor fan stop while the indoor fan operated at set speed.
When Tpreset-1
ć˘
Tamb.
˘
1
ć
, the unit will maintain its previous operation status.
In this mode, the four-way valve is de-energizing. The temperature setting range is 16
̚
30
ć
and the indoor unit displays
operation icon, cooling icon and set temperature.
ĸ
Protection Functions
ƹ
Antifreezing protection
If the system is under antifreezing protection, the compressor and the outdoor fan stops operation, and the indoor fan
operates at setting speed. If antifreezing protection is eliminated and the compressor has been stopped for 3 minutes, the
unit will resume its previous operation status.
T1 ˚C
Tpreset –1 ˚C
Compressor
Outdoor fan
Indoor fan
Run
Tamb.
Stop cooling
Start cooling
Original operating status
≥ 6 min.
≥ 3 min.
≥ 6 min.
Setting fan speed
Ĺ
If the system current exceeds the specified value in 3 successive seconds, except indoor fan, the complete unit will stop
operation. After 3 minutes, if the overcurrent is eliminated, the complete unit will resume previous operation.
If overcurrent protection occurs for 6 successive times (if the compressor operates for 6 minutes continuously, the
protective times will be cleared.), except indoor fan, the complete unit will stop operation. In this case, you should turn off
the unit by remote controller and then restart it. During overcurrent protection, the nixie tube displays error code “E5”, and
operation indicator lamp blinks (OFF 3 seconds and blinks 5 times).
(2) Dry Mode
ķ
Dry Conditions and Process
Overcurrent Protection
Stop
During antifreeze protection
Compressor
Outdoor fan
Indoor fan
min
Preset speed
Run
Stop