Heating Mode - Gree GWH07NA-K3NNA4a Service Manual

(2)Dry Mode
Dry Conditions and Process
When Tamb. Tpreset+2 , the unit will run in dry an d cooling mode, in that case the compressor and outdoor fan will run and
the indoor fan will run at low speed.
When Tpreset-2 Tamb. Tpreset+2 , the unit will run in dry mode, in that case, the indoor fan will run at low speed, the
compressor and the outdoor fan will be stopped in 6 min. After 4 min, the compressor and the outdoor fan will be restarted. Dry
process is cycled as the above.
When Tamb. Tpreset-2 , the compressor and the outdoor fan will stop working and the indoor fan will run at low speed.
In this mode, the four-way valve is de-energized, and setting temperature range is between 16 30 . The displayer will display
running and dry ing icons and setting temperature.
Protection
Freeze potection
If freez e protection of the system is detected in dry and cooling mode, the compressor and the outdoor fan will stop
running and the indoor fan will run at low speed. When the freez e protection is released and the compressor has been
stopped for 3 min, the complete unit will resume its previous running state. Upon the condition that the compressor runs for 6
min and stops for 4 min is met and freeze protection is detected, the compressor and the outdoor fan will stop running and
the indoor fan will run at low speed. When the freeze protection is released and the compressor has been stopped for 4
min, the complete unit will resume its previous running state.
Other protection
Other protections are the same as those in cooling mode.

(3)Heating mode

Heating conditions and process
When Tamb. Tpreset+2 , the unit will run in heating mode, in that case, the four-way valve, the compressor and the outdoor
fan will run simultaneously. The indoor fan will delay at most 2mins to run. The indoor fan will run 2 mins delayed at most.
When Tamb Tpreset+4 , the compressor and the outdoor fan will stop and the four-way valve will remain energized(keep
energizing) and the indoor fan will blow residual heat.
When T +2 T
preset amb.
Under this mode, the four-way valve is energized, and setting temperature range is 16 30 . The displayer will display running
and heating icons and setting temperature.
T
amb.
T +2
preset
T 2
preset
Compressor
Outdoor fan
Indoor fan
Run
T +4 , the unit will maintain its previous running state.
preset
Tpreset
Tpreset
Tamb .
mi n
Compressor
Outdoor uni t
min
Indoor unit
4-way valve
Run
min min.
.
min.
min.
Low speed
Stop
mi n
mi n
min
setting
settin g
fan speed
fan speed
Stop
Cooling
Dehumidfying
Stop
stop heating
original operation status
start heating