The Conditions And Processes Of Heating; Protection Functions - Gree KF-20GW/A20 Service Manual

DRY Mode
The conditions and processes of dehumidifying:
If Tamb>Tset+2¡æ, the cooling mode will act, indoor fan runs at the set speed.
If Tset -2¡æ¡ÜTroom¡ÜTamb¡ÜTset+2¡æ,DRY mode will act, the indoor fan will run at the low speed.after running for 6mins,
compressor will stop, 15sec later, outdoor fan will stop, 30sec later, the indoor fan will stop, after 3.5Min, the compressor and out-
door fan will start to run, indoor fan will run at low speed, the processes of dehumidifying are running as the above cycle, and out-
door fan runs at the low speed.
If Tamb£¼T set-2¡æ, compressor, outdoor fan and indoor fan stop running.
In this mode, the reversal valve will not power on, the setting temp. range:16¡æ~30¡æ.

Protection Functions

Antifreezing Protection
When running in COOL mode, antifrrezing protection is the same as the cooling, the DRY mode act (compressor starts running
for 6 Min and stops running for 4Min), when the antifreezing protection is detected, the compressor will stop, but outdoor fan will
delay 15secs and stop, indoor fan will run at low speed; when antifreezing protection is eliminated and compressor has stopped for
3min, the whole unit will run at the original status.
HEAT Mode

The conditions and processes of heating

If Tamb ¡ÜTset+2¡æ, HEAT mode will act, compressor, outdoor fan and reversing valve will run, but indoor fan will
after 3Min delayed and run.
If Tamb¡ÝTset+4¡æ, Compressor will stop first, outdoor fan will delay 15s and stop,reversing valve will keep working,
after 60secs indoor fan will blow the surplus heat, after 60secs it will stop.
If Tset+2¡æ£¼T set£¼T set +4¡æ,the unit will keep running in the old mode.
In this mode, the reversal valve will not power on, the setting temp. range:16¡æ~30¡æ.
During the antifreezing protection
Compressor
Outdoor fan
Indoor fan
Running
Ambient
temp. Tamb
Tset
Tset
6Min
Compressor
Outdoor fan
Setting
Indoor fan
fan speed Low speed
Running
During the antifreezing protection
Compressor
Outdoor fan
Indoor fan
Running
3Min
Run at the set speed
Stop
4Min 6Min 4Min
Low speed
Low speed
Stop
3Min
Run at low speed
Stop
Start the cooling
Dehumidifying operation
Stop the cooling