Description Of Each Control Operation; Temperature Parameters; Basic Functions; Protection Function - Gree GWH09MB-K3DNA3K/I Service Manual

1. Temperature Parameters

Indoor preset temperature (T
Indoor ambient temperature (T

2. Basic Functions

Once energized, in no case should the compressor be restarted within less than 3 minutes. In the situation that memory
function is available, for the first energization, if the compressor is at stop before de-energization, the compressor will be
started without a 3-minute lag; if the compressor is in operation before de-energization, the compressor will be started with
a 3-minute lag; and once started, the compressor will not be stopped within 6 minutes regardless of changes in room
temperature;
(1)COOL mode
The condition and process of cooling
COOL mode will act, the compressor and outdoor fan will run, and the indoor fan will run at the set speed.
If T ≥T
amb. preset
If T ≤T t-2 , the compressor will stop, the outdoor fan will delay 30 seconds to stop, and the indoor fan will run at the set speed.
amb. prese
≤T
If Tpreset-2 ≤T
amb preset
In this mode, the reversal valve will not be powered on and the temperature setting range is 16
Tpreset
Tpreset 2 ˚C
Compressor
Outdoor fan

Protection function

Overcurrent protection
If total current is high, the compressor will run in limited frequency. If total current is too high, the compressor will stop, the
outdoor fan will delay 30 seconds to stop, indoor unit will display E5 and outdoor

Freeze protection

When the freeze protection is detected, the compressor will stop, the outdoor fan will stop after 30 seconds, and the
indoor fan and swing motor will keep running in the original mode. When freeze protection is eliminated and the
compressor has stopped for 3 minutes, the compressor will resume running in the original mode.
(2) Dehumidifying Mode
Working conditions and process of dehumidifying
If T . T , the unit will enter cooling and dehumidifying mode, in which case the compressor and the outdoor fan will
amb preset
operate and the indoor fan will run at low speed.
If T -2 T . T
preset amb preset
If T .< T -2 , the compressor will stop, the outdoor fan will stop with a time lag of 30s, and the indoor fan will
amb preset
operate at low speed.
Protection
Protection is the same as that under the cooling mode.
)
preset
)
amb.
, the unit will keep running in the previous mode.
Tamb.
≥ 6 min.
Setting fan speed
Indoor fan
Run
Compressor
Outdoor fan
Indoor fan
Run
, the compressor remains at its original operation state.
≥ 3 min. ≥ 6 min.
Stop
During freeze protection
min
Preset speed
Stop
~30 .
Start cooling
Original operating status
Stop cooling
yellow light will blink 5 times.