23
Technical Information
Service Manual
6.2 Brief Description of Modes and Functions
1. Temperature Parameters
◆
Indoor preset temperature (T
preset
)
◆
Indoor ambient temperature (T
amb.
)
2. Basic Functions
Once energized, in no case should the compressor be restarted within less than 3 minutes. In the situation that memory function is
available, for the first energization, if the compressor is at stop before de-energization, the compressor will be started without a 3-minute
lag; if the compressor is in operation before de-energization, the compressor will be started with a 3-minute lag; and once started, the
compressor will not be stopped within 6 minutes regardless of changes in room temperature;
(1)Cool mode
①
The condition and process of cooling
If T
amb.
≥T
preset
cool mode will act, the compressor and outdoor fan will run, and the indoor fan will run at the set speed.
If T
amb.
≤T
2°C
, the compressor will stop, the outdoor fan will delay 30 seconds to stop, and the indoor fan will run at the set speed.
If T
2°C
≤T
amb.
≤T
preset
, the unit will keep running in the previous mode.
In this mode, the reversal valve will not be powered on and the temperature setting range is 16°C~30°C.
During antifreeze protection
Compressor
Outdoor fan
Indoor fan
min
Preset speed
Run
Stop
Tpreset
Tpreset –2 ˚C
Compressor
Outdoor fan
Indoor fan
Run
Tamb.
Stop
Stop cooling
Start cooling
Original operating status
≥ 6 min.
≥ 3 min.
≥ 6 min.
Setting fan speed
②
Protection function
◆
Overcurrent protection
If total current is high, the compressor will run in limited frequency. If total current is too high, the compressor will stop, the outdoor fan will
delay 30 seconds to stop, indoor unit will display E5 and outdoor yellow light will blink 5 times.
◆
Antifreezing protection
When the antifreezing protection is detected, the compressor will stop, the outdoor fan will stop after 30 seconds, and the indoor fan and
swing motor will keep running in the original mode. When antifreezing protection is eliminated and the compressor has stopped for 3
minutes, the compressor will resume running in the original mode.
During antifreeze protection
Compressor
Outdoor fan
Indoor fan
min
Preset speed
Run
Stop
Tpreset
Tpreset –2 ˚C
Compressor
Outdoor fan
Indoor fan
Run
Tamb.
Stop
Stop cooling
Start cooling
Original operating status
≥ 6 min.
≥ 3 min.
≥ 6 min.
Setting fan speed
(2) Dehumidifying Mode
①
Working conditions and process of dehumidifying
If T
amb.
＞
T
preset
, the unit will enter cooling and dehumidifying mode, in which case the compressor and the outdoor fan will operate and the
indoor fan will run at low speed.
If T
preset-2°C
≤T
amb.
≤T
preset
, the compressor remains at its original operation state.
If T
amb.
< T
preset-2°C
, the compressor will stop, the outdoor fan will stop with a time lag of 30s, and the indoor fan will operate at low speed.
②
Protection
Protection is the same as that under the cooling mode.
(3) Heat mode
①
Working conditions and process of heating
