Description Of Each Control Operation; Temperature Parameters; Basic Functions; Cooling Mode - Gree GWC09NA-D3NNA3A/I Service Manual

1 Temperature Parameters

Indoor preset temperature (Tpreset)
Indoor ambient temperature (Tamb.)

2 Basic functions

( The temperature in this manual is expressed by Centigrade. If Fahrenheit , is used, the switchover between
them is Tf=TcX1.8+32.)
Once the unit is energized, the compressor shall never be restarted except 3mins interval at least. For the first energization,
if the unit is at off status before power failure, the compressor can be restarted without 3-min delay. But if the unit is at o n
status before power failure, the compressor shall be restarted with 3mins delay. Once the compressor is started up, the
compressor won't stop running within 6mins with the change of room temperature.

(1)Cooling mode

Cooling conditio ns and process
When Tamb. Tpreset+1 , the unit starts cooling operation. In this case, the compressor and the outdoor fan operate and the
indoor fan operates at set speed .
When Tamb. Tpreset-1 , the compressor and the outdoor fan stop while the indoor fan run s at set speed.
When Tpreset-1 Tamb.
In cooling mode, the four-way valve is de-energized; temperature setting range is 16 30
icon, cooling icon and set temperature .
Protection Functions
F reez e potection
If the system is under freeze protection, the compressor and the outdoor fan stop operation, and the indoor fan operates at set
speed. If freeze protection is eliminated and the compressor has been out of operation for 3 minutes, the unit will resume its
previous running state.
Tpreset+1 , the unit will maintain its previous running state.
T
amb.
T +1
preset
T 1
preset
min
.
Compressor
Outdoor fan
Set Fan speed
Indoor fan
Run
Freeze protection period
Compressor
Outdoor fan
Indoor fan
Run
Start cooling
Original operating status
min
min
.
.
Stop
min
S
et Fan Speed
Stop
t he indoor unit displays operation
Stop cooling