20
Technical Information
Service Manual
6.2 Brief Description of Models 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 avail-
able, 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 compres-
sor will not be stopped within 6 minutes regardless of changes in room temperature.
(1)Cooling Mode
①
The condition and process of cooling
If T
amb.
≥T
preset
cooling mode will act, the compressor and outdoor fan will run, and the indoor fan will run at the set speed.
If T
amb.
≤T
preset
-2°C(3.6°F), 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
preset
-2°C(3.6°F)<T
amb
.<T
preset
, the unit will keep running in the previous mode.
When 0≤ T
preset
-T
amb.
＜
2°C(3.6°F), if indoor fan speed is high, it will turn to medium fan speed; if indoor fan speed is medium or low, it will
keep the same;(this condition will be valid only when the compressor is operating); if indoor fan speed is super high, it will keep the same;
When T
amb.
-T
preset
≥1°C(1.8°F), the fan speed will return to set fan speed;
In this mode, the reversal valve will not be powered on and the temperature setting range is 16~30°C(68~86°F).
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 out door 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 min-
utes, the compressor will resume running in the original mode.
(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(3.6°F)≤T
amb.
≤T
preset
, the compressor remains at its original operation state.
If T
amb.
< T
preset
-2°C(3.6°F), 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 function
Protection is the same as that under the cooling mode.
(3) Heating Mode
①
The condition and process of heating
If T
amb.
≤T
preset
+2°C(3.6°F), heating mode will act, the compressor, outdoor fan and reversal valve will run, the indoor fan will delay 3min to
stop at the latest
If T
preset
+2°C(3.6°F)<T
amb.
<T
preset
+5°C(9°F),the unit will keep running in the original mode.
If T
amb.
≥T
preset
+5°C(9°F), the compressor will stop, the outdoor fan will delay 30s to stop and indoor fan will blow 60s at low speed, the fan
speed cannot be shifted within blow residual heat.
Tpreset
Tpreset –2 ˚C
Compressor
Outdoor fan
Indoor fan
Run
Tamb.
Stop
Stop cooling
Start cooling
Original operating status
≥ 6 min.
30S
30S
≥ 3 min.
≥ 6 min.
Set fan speed
During antifreeze protection
Compressor
Outdoor fan
Indoor fan
min
Preset speed
Run
Stop
30S
3
