Gree GVA24AL-K3NNC7A/I Service Manual page 29

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. ＜ Tpreset+1℃ , the system keeps previous operation status.
◆ When Tamb.≥Tpreset+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)
26
T
amb.
T +2
preset
T 2
preset-
Compressor
Outdoor fan motor
Indoor fan motor
T +1
preset
T -1
preset
T .
amb
m i . n
Compressor
Outdoor unit
Intdoor unit
Set fan speed
min.
Reversing
valve
20S
6 min 6min.
4min.
4min.
Low speed
min.
m i . n
10S 10S
min. Set fan speed
Cooling
Drying
Stop
Stop heating
Original operating status
Start heating
Technical Information
Service Manual