Description Of Each Control Operation - Gree GWC18KG-K3DNA5A Service Manual

6.5 Description of Each Control Operation

Temperature Parameter
Room setting temperature (Tpreset)
Room ambient temperature (Tamb.) (temperature sensor :15K, partial pressure resistance:15K)
Surface temperature of copper pipe for indoor heat exchanger (T
1. Basic Functions of System
(1) Cooling Mode
1. In this mode, indoor fan and swing will operate according to the setting status. The temperature setting range is 16~30 .(Fahrenheit: 61~86 ).
2. When the unit stop operation due to malfunction of outdoor unit or protection, indoor unit will keep original operating status. Malfunction code will be
displayed.
3. When 0 (Tpreset-Tamb.), if the indoor unit is operating at high fan speed, the speed of fan will change to medium fan speed; if the indoor unit is
operating at medium or low fan speed, the speed of fan will keep the same; (This condition can only be carried out after the compressor is started up);
There's no change for super-high fan speed; when (Tamb.-Tpreset) 1 , the fan speed will resume setting fan speed;
(2) Dry Mode
1. In this mode, fan will operate at low fan speed and swing will operate at setting status. The temperature setting range is 16~30 .(Fahrenheit:
61~86 ).
2. When the unit stop operation due to malfunction of outdoor unit or protection, indoor unit will keep original operating status. Malfunction code will be
displayed.
(3) Fan Mode
1. In this mode, indoor fan will operate at high, medium, low or auto fan speed. Compressor, indoor fan and the four-way valve will all stop operation.
2. In this mode, the temperature setting range is 16~30 .(Fahrenheit: 61~86 ).
(4) Heating Mode
1. In this mode, the temperature setting range is 16~30 . (Fahrenheit: 61~86 ).
2. Working condition and process of heating: when the unit is turned on in heating mode, indoor unit enters into anti-cold air condition; when the unit is
tuned off, the unit will enter into the condition of blowing residual heat.
3. Protection function: in heating mode, when the compressor is stopped due to malfunction, indoor fan will operate at the condition of blowing residual
heat.
4. Defrosting control: after receiving the defrosting signal from outdoor unit, the defrosting code H1 will be displayed.
5. Anti-cold function
6. Blowing residual heat function;
a. During heating operation, when the stopping condition for the compressor is reached, the compressor and the outdoor fan motor stop operation. The
upper& down horizontal louver will rotate to the horizontal position L. The indoor fan will be stopped after operating for 60s at setting speed.
b. Due to the blockage of PG motor, horizontal louver will keep the stop position when the unit is turned off. (In other modes) When the unit is stopped
due to other malfunctions, up&down horizontal louver will rotate to horizontal position L. The indoor fan will be stopped after operating for 60s at setting
speed.
c. If the unit is turned off when the compressor is operating in heating mode or auto heating mode, up&down horizontal louver will rotate to horizontal
position L. The indoor fan will be stopped after operating for 60s at setting speed.
(5) Auto Mode
1. When Tamb. 26 , the unit will operate in cooling mode. The implied setting temperature is 25 . ((Fahrenheit: 77 ).
2. Heat pump type: when Tamb 22 , the unit will operate in heating mode. The implied setting temperature is 20 . ((Fahrenheit: 68 ).
3. Cooling only unit: when Tamb 25 , the unit will operate in auto mode. The implied setting temperature is 25 . ((Fahrenheit: 77 ).
4. When 23 Tindoor amb. 25 , the unit will operate in auto fan mode if the unit is turned on and enters into the auto mode for the fist time. If the
unit is switched to auto mode from other mode, it will keep the previous operation mode (if the unit is switched to auto mode from dry mode, the unit will
operate at auto fan mode).
2. Display Status of Indoor Indicator
(1) Status of Indoor Display Board
1. After energization, all the icons will be displayed and then only the power indicator is bright. When the unit is turned on by remote controller, the
operation indicator will be bright. Meanwhile, the current setting operation mode will be displayed.
2. During defrosting, "dual-8" will display "H".
3. "Dual-8" displays setting temperature.
Display of Operation Icon and Mode Icon
After energization, all the icons will be displayed for once. In standby status, the operation indicator will be in red. If turn on the unit by remote controller,
the operating indication icon will be bright. Meanwhile, the current setting operation mode will be displayed (mode indicator: cooling indicator, heating
indicator, dry indicator). If turn off the light button, all displays will be turned off.
Temperature display control mode for split type unit
1. When user set the remote controller as the setting temperature display status, the current setting temperature will be displayed on remote
controller.
2. Only when the remote control signal is switched to indoor ambient temperature display status from other display status, controller will display the
indoor ambient temperature for 5s and then turn back to display the setting temperature.
3. When user hasn't set the temperature displaying status, it will be displayed according to the setting temperature.
(2)Malfunction Display of Indoor Unit
Indoor Unit
(temperature sensor: 20K, partial pressure resistance: 20K)
indoor tube)
Function and Control
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