Introduction Of Each Mode Function - Gree GVA24AL-K3NNC7A/I Service Manual

Service Manual

6.3 Introduction of Each Mode Function

1.Summary
Temperature parameter
◆ Indoor set temperature (Tpreset)
◆ Indoor ambient temperature (Tamb.)
◆ Inner tube temperature of indoor evaporator (Ttube)
2. Introduction of basic mode function
Once the compressor is energized, there should be a minimum interval of 3 mins between two start-ups.
If the unit is with memory function and is off before power failure, the compressor can be restarted without an interval of 3 mins; if the
unit is on before power failure, the compressor will be restarted with an interval of 3 mins.
Once compressor is started, it won't stop within 6 mins according to the change of room temp.
(1) Auto mode
① Operation condition and process
Under auto mode, the system will automatically select operation mode (cooling, dry, heating and fan) according to indoor ambient
temperature.
◆ When Tamb. ＞ 26℃ , the system operates under cooling mode; Ex-factory set temperature is 26℃ .
◆ When 20℃ ≤Tamb.≤26℃ , the system operates under drying mode; Ex-factory set temperature is 24℃ .
◆ Heat pump unit: when Tamb. ＜ 20℃ , the system operates under heating mode; Ex-factory set temperature is 20℃ .
◆ Cooling only unit: when Tamb. ＜ 20℃ , the system operates under fan mode; Ex-factory set temperature is 20℃ .
② Protection function is same as that under cooling, drying and heating mode. (See function protection of this section)
(2) Cooling mode
① Operation condition and process
◆ When Tamb.≥Tset+1℃ , the system operates under cooling mode. In this case, the compressor and the ODU fan motor operate,
and the IDU fan motor operates at set speed.
◆ When Tset-1℃＜ Tamb. ＜ Tset+1℃ , the system will maintain its previous operation status.
◆ When Tamb.≤Tset-1℃ , the compressor and the ODU fan motor stop, while the IDU fan motor operates at set speed.
In cooling mode, the 4-way valve is de-energized (4-way valve is not available for cooling only unit). Temperature setting range is
16 ～ 30℃ .
Graphic instruction:
(Same as below)
Indicates operation
Indicates stop
② Protection function (See function protection of this section)
(3) Drying mode
① Operation condition and process
◆ When Tamb. ＞ Tset+2℃ , the system starts drying and cooling. In this case, the compressor and the ODU fan motor operate, and
the IDU fan motor operates at low speed.
◆ When Tset-2℃ ≤Tamb.≤Tset+2℃ , the compressor and the ODU fan motor operate for 6 mins and stop for 4 mins in cycle; the IDU
Installation and Maintenance
Tamb.
Tpreset +1 ˚C
Tpreset –1 ˚C
6 min.
Compressor
Outdoor fan motor
Indoor fan motor
Start cooling
Original operating status
Stop cooling
3 min. 6 min.
Set fan speed
25