Defrosting Control (Outdoor Unit); Heating Mode (Outdoor Unit); Control Logic; Compressor Control - Gree Neo GWH09MA-A3DNA3A Installation, Service & Troubleshooting

Basic Functions - 18K & 24K 230 volt
(4) Heating Mode
1. Conditions and processes of heating operations: (Tindoor ambient temperature is the actual detection temperature
of indoor environment
thermo-bulb,Theating indoor ambient temperature compensation is the indoor ambient temperature compensation
during heating operations)
(1) If the compressor is shut down, and [(Tindoor ambient temperature - Theating indoor ambient temperature
compensation) - Tsetup] ≤ 32.9°F, start the machine to enter into heating operations for heating;
(2) During operations of heating, if 32°F ≤ [(Tindoor ambient temperature - Theating indoor ambient temperature
compensation) - Tsetup] < 35.6°F, the heating operation will be still running;
(3) During operations of heating, if 35.6°F ≤ [(Tindoor ambient temperature - Theating indoor ambient
temperature compensation) - Tsetup], the heating operation will stop after reaching the temperature point.
2. The temperature setting range in this mode is: 60.8-86°F
C. Special Functions
Defrosting Control
a. Conditions for starting defrosting
After the time for defrosting is judged to be satisfied, if the temperature for defrosting is satisfied after detections for
continuous 3minutes, the defrosting operation will start.
b. Conditions of finishing defrosting
The defrosting operation can exit when any of the conditions below is satisfied
c. Toutdoor pipe temperature ≥ (Toutdoor ambient temperature - [Ttemperature 1 of finishing defrosting];
d. The continuous running time of defrosting reaches [tmax. defrosting time].
D. Control Logic

(1) Compressor Control

Start the compressor after starting cooling, heating, dehumidifying operations, and the outer fans start for 5s; when
the machine is
shut down, in safety stops and when switching to air-supplying mode, the compressor will stop immediately.
In all modes: once the compressor starts up, it will not be allowed to stop until having run for the [tmin. compressor
running time] (Note: including cases of shutdown when the temperature point is reached; except the cases requiring
stopping the compressor such as fault protection, remote shutdown, mode switching etc.);
In all modes: once the compressor stops, it will be allowed be restart after 3-minute delay (Note: The indoor units have
a function of power memory, the machine can be restarted after remote shutdown and powering up again without
delay).
1. Cooling mode
Start the machine to enter into cooling operation for cooling, the compressor is switched on.
2. Drying mode
Same as the cooling mode.
3. Air-supplying mode
The compressor is switched off.
4. Heating mode
(1) Start the machine to enter into heating operation for heating, the compressor is switched on.
(2) Defrosting:
a. Defrosting starts: the compressor is shut down, and restarts it after 55-second delay.
b. Defrosting ends: the compressor stops, and then starts it after 55-second delay.
Product Introduction
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