Description Of Each Control Operation - Gree GWC12NC-K3NNA3E Service Manual

Function and Control

6.2 Description of Each Control Operation

1Temperature Parameters
◆ Indoor preset temperature (Tpreset)
◆ 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 compressor is energized, there should be a minimum interval of 3 minutes between two start-ups. But if the unit is de-
energized and then energized, the compressor can restart within 3 minutes.
2.1 Cooling mode
2.1.1 Cooling conditions and process
When Tamb. ≥Tpreset+1℃ , 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℃ , the compressor and the outdoor fan stop while the indoor fan runs at set speed.
When Tpreset-1℃＜ Tamb. ＜ Tpreset+1℃ , the unit will maintain its previous running status.
In cooling mode, the four-way valve is de-energized; temperature setting range is 16 ～ 30℃ ; the indoor unit displays operation icon,
cooling icon and set temperature.
2.1.2 Protection Functions
◆ Freeze protection
If the system is under freeze protection, the compressor and the outdoor fan stop operation, and the indoor fan operates at set speed.
If freeze protection is eliminated and the compressor has been out of operation for 3 minutes, the unit will resume its previous running
status.
2.2 Dry Mode
2.2.1 Dry Conditions and Process
When Tamb. ＞ Tpreset+2℃ , the unit starts drying and cooling operation. In this case, the compressor and the outdoor fan operate; the
indoor fan operates at low speed.
When Tpreset-2 ℃ ≤Tamb. ≤Tpreset+2 ℃ , the unit will start drying operation. In this case, the indoor fan operates at low speed; the
compressor and the outdoor fan operate for 6 minutes and stop for 4 minutes in cycle.
When Tamb. ＜ Tpreset-2℃ , the compressor and the outdoor fan stop operation; the indoor fan operates at low speed.
In drying mode, the four-way valve is de-energized; temperature setting range is 16 ～ 30℃ ; the indoor unit displays operation icon,
cooling icon and set temperature.
Tamb.
Tpreset +1 °C
Tpreset –1 °C
≥ 6 min.
Compressor
Outdoor fan
Indoor fan
Run
Compressor
Outdoor fan
Indoor fan
≥ 3 min. ≥ 6 min.
Set fan speed
Stop
During freeze protection
min
Preset speed
Run Stop
Start cooling
Original operating status
Stop cooling
15