Gree GWH18TC-S3DNA1D Service Manual page 49

② Defrosting and Oil Return
When receiving the signal of defrosting and oil return, the horizontal louver(big one) will rotate to the position where the angle is
minimum and the other horizontal louver(small one) will close. In 10 seconds later, indoor fan will stop operation. During defrosting, oil
return and 5 minutes after quit, all indoor pipe temperature sensors will not be detected. When receiving oil return signal or defrosting
signal sent by outdoor unit, Heating indicator on indoor unit is off for 0.5s and then blinks for 10s.
③ Blow residual heat
In heating mode, when temperature reaches the set temperature, the compressor and outdoor fan will stop.
The horizontal louver (big one) will rotate to the default position for cooling and the other one (small one) will close. Indoor unit will
operate at set speed for 60s and then stop operation.
When the unit is in heating mode or auto heating mode, and also the compressor and indoor fan are operating, if turning off the
unit,compressor and outdoor fan will stop. Horizontal louver (big one) will rotate to the position where gentle wind is blown out (default
position for cooling) and the other horizontal louver (small one) will close. Indoor unit will operate at low speed for 10 seconds and
then the unit will be turned off.
(4)Fan Mode
In this mode, indoor fan operates at set speed while compressor and outdoor fan stop operation. The set temperature range is
16~30°C. Operation icon and set temperature are displayed.
(5)Auto Mode
In this mode, operation mode (Cool, Heat, Fan) will be automatically selected according to change of ambient temperature. Operation Tpreset
icon, actual operation icon and set temperature will be displayed. There is 30s delay for protection when changing mode. The
protection function is as the same as that under each mode.
① When Tamb.≥26°C the unit will operate at cooling mode, the default set temperature is 25°C.
② When Tamb. ≤21°C the unit will operate at heating mode, the default set temperature is 20°C if the cooling only unit operates at fan
mode, the default set temperature is 25°C;
③ When 22°C≤Tamb.≤25°C and the unit is turned on for the first time, if it changes to auto mode from other mode, the previous
operation mode will be maintained; If it changes to auto mode from dry mode, the unit will operate at fan mode.
④ When the unit operates at auto mode, the frequency of compressor is as the same as that under cooling mode, while it is as the
same as that under heating mode.
Protection function
A. Under cooling mode, the protection function is as the same as that under cooling mode.
B. Under heating mode, the protection function is as the same as that under heating mode.
Tpreset
(6) "8°C" Heating
Under heating mode, press buttons "Temp" and "Clock" simultaneously, the 8°C heating function will be activated and "cold air
prevention" will be shielded.
① 8°C heating can't co-exist with sleep function. If 8°C heating function is set, it can be cancelled by pressing sleep button, In
that case, the set temperature will be that before entering 8 heating; If sleep function is set, press buttons "Temp" and "Clock"
simultaneously to activate 8°C function and cancel sleep function at the same time.
② Set temperature is 8°C and it is displayed on the indoor display panel.
46
Tpreset +5 ˚C
Tpreset +2 ˚C
Tamb.
6 min.
Compressor
Outdoor unit
Indoor unit
2 min.
4-way valve
Run
Tpreset +5 ˚C
Heating mode Tpreset
Tpreset +2 ˚C
=20 (if cooling-only
Tamb.
unit, it is Fan mode,
6 min.
Tpreset=25
Compressor
Outdoor unit
21℃
Indoor unit
2 min.
4-way valve
Run
Heating mode Tpreset
=20 (if cooling-only
unit, it is Fan mode,
Tpreset=25
21℃
Start heating
3 min. 6 min.
Blow residual
Blow residual heat
heat
2 min.
Stop
Start heating
Previous running status
Keep current
Start heating
3 min. 6 min.
operation mode
Blow residual
Blow residual heat
heat
26℃
2 min.
Stop
Keep current
Tpreset=25
operation mode
26℃
Start heating
Previous running status
Cooling mode,
Tpreset=25
Cooling mode,
Service Manual
Technical Information