Gree GWH18PD-K3NNA1A Service Manual page 24

Function and Control
2.2 Dry Mode
2.2.1 Dry Conditions and Process
When Tamb. Tpreset+2 , the unit starts drying and cooling operation. In this case, the compressor and the outdoor fan operate; the
indoor fan operates at low speed.
When Tpreset - 2 ≤Tamb. ≤Tpreset+2 , the unit will start drying operation. In this case, th e indoor fan operates at low speed ; the
compressor and the outdoor fan operate for 6 minutes and stop for 4 minutes in cycle.
When Tamb. Tpreset - 2 , the comp ressor and the outdoor fan stop operation ; the indoor fan operates at low speed.
In drying mode, t he four - way valve is de - energiz ed; temperature setting range is 16 30 ; the indoor unit displays operation icon,
cooling icon and set temperature .
2.2. 2 Protection
Freeze protection
During drying and cooling operation, if the system is under freeze protection , the compressor and outdoor fan stop operation while
indoor fan operates at low speed. If freeze protection is eliminated and the compressor has been out of operation for 3 minutes , the
complete unit will resume its previous runn ing status .
During the cycle of o n for 6 min and off for 4 min, if freeze protection is detected, the compressor and t he outdoor fan will stop operation ;
the indoor fan will operate at low speed. When freeze protection is eliminated and the compressor has been out of operation for 4
min utes , the complete unit will resume its previous running status .
2.2.3 Other protection
Other protections are the same as those in cooling mode.
2.3 Heating mode
2.3.1 Heating conditions and process
When Tamb. ≤Tpreset+2 , the unit starts heating operation. In this case, the 4-way valve, compressor and outdoor fan operate
simultaneously; the indoor fan operates with a maximum delay of 2 minutes.
When Tamb≥Tpreset+4 , the compressor and outdoor fan stop operation. The 4-way valve remains energized; the indoor fan blows
residual heat.
When T +2 T
preset amb.
Under this mode, the 4-way valve is energized; temperature setting range is 16 30 ; the indoor unit displays operation icon, heating
icon and set temperature.
Reversing
2.3.2 Defrosting Conditions and Process
With intelligen t defrosting function, the unit defrosts automatically according t o the actual condition. The indoor unit displays " H1 "
T
amb.
T +2
preset
T 2
preset
Compressor
Outdoor fan
Indoor fan
Run
T +4 , the unit will maintain its previous running status.
preset
T +4
preset
T +2
preset
T .
amb
m i . n
Compressor
Outdoor fan
preset wind
Indoor fan
min.
valve
Run
6 min
6min.
4min.
4min.
Low speed
Stop
min.
m i . n
min. preset wind
Stop
Cooling
Dehumidfying
Stop
Stop heating
Original operating status
Start heating
.
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