Description Of Each Control Operation - Gree GWH09AB-A3DNA1B Service Manual

6.3 Description of Each Control Operation

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) Cooling Mode
Working conditions and process of cooling
When T T , the unit will enter cooling operation, in which case the indoor fan, the outdoor fan and the compressor will
amb preset
work and the indoor fan will run at preset speed.
When T T -28.4
amb preset
at preset speed.
ºF
When T -28.4 < T
preset amb.
Under this mode, the four-way valve will be de-energized and temperature can be set within a range from 61 to 86
If the compressor is shut down for some reason, the indoor fan and the swing device will operate at original state.
Protection
Antifreeze protection
Under cooling and dehumidifying mode, 6 minutes after the compressor is started:
If T 35.6 ºF , the compressor will operate at reduced frequency.
evap
If T 30.2 ºF is detected for durative 3 minutes, the compressor will stop, and after 30 seconds, the outdoor fan will stop;
evap
and under cooling mode, the indoor fan and the swing motor will remain at the original state.
ºF
If T 42.8 and the compressor has remained at OFF for at least 3 minutes, the compressor will resume its original
evap.
operation state.
Total current up and frequency down protection
If Itotal A, frequency rise will be allowed; if Itotal
run at reduced frequency; and if Itotal
(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.
ºF
If T 28.4 T T
preset amb
ºF
If T .< T 28.4 , 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.
)
preset
.)
amb
ºF , the compressor will stop, the outdoor fan will stop with a time lag of 30s, and the indoor fan will run
< T +33.8 ºF , the unit will remain at its previous state.
preset
T
amb
T
preset
28.4 ºF
T
reset
6 minutes
Compresso r
Outdoor fan
Indoor fan
Run
B, frequency rise will not be allowed; ifItotal
D, the compressor will stop and the outdoor fan will stop with a time lag of 30s.
, the compressor remains at its original operation state.
preset
Start cooling
Original working state
Stop cooling
3 minutes
6 minutes
Preset fan s pee d
Stop
18
Function and Control
ºF
C, the compressor will