Gree GWC36LB-D1NNA2A/I Service Manual page 22

Function and Control
High Pressure Protection
When it's detected that the high pressure switch is open, the unit will turn to high pressure protection
and all loads will be turned off. Meanwhile, all the buttons and remote control signal will be shielded;
When the high pressure protection of compressor is released, the shielding of buttons and remote
control signal will be released. The unit can be turned on normally only after the unit is turned off by
remote controller. Nixie tube will display the error code "E1" and operation indicator will blink (OFF 3s
and blink once).
Low Pressure Protection
If it's detected that the low pressure switch is open when the compressor hasn't been started up, or it's
detected that the low pressure switch is open for twice during the operation process, the unit will turn to
low pressure protection and all loads will be turned off; The unit can be turned on normally only after the
unit is turned off by remote controller. Nixie tube will display the error code "E3" and operation indicator
will blink (OFF 3s and blink three times).
Discharge Protection
When the compressor operated, if it's detected that the discharge temperature exceeds the specified
value, the main unit will turn to the status that only the fan operates. After 3 minutes, if discharge
temperature is lower than the specified value, the complete unit will resume original operating status. If
the discharge is too high for twice successively, all the loads will be turned off. The unit can be turned on
normally only after the unit is turned off by remote controller. Nixie tube will display the error code "E4"
and operation indicator will blink (OFF 3s and blink four times).
(2)Dry Mode
Dry Conditions and Process
When Tamb. Tpreset+2 , the unit starts drying and cooling operation. In this case, the compressor
and outdoor fan operates and the indoor fan operates at low speed.
When Tpreset-2
operates at low speed, and the compressor and the outdoor fan operate 6 minutes and stop 4 minutes in
cycle.
When Tamb. Tpreset-2 , the compressor and the outdoor fan stops operation while the indoor fan
operates at low speed.
In drying mode, the four-way valve is de-energizing, temperature setting range is 16 30 , and the
indoor unit displays operation icon, cooling icon and set temperature.
Protection Function
Antifreezing protection
During drying and cooling operation, if the system is under antifreezing protection, the compressor and
outdoor fan stop operation while indoor fan operates at low speed. If antifreezing protection is eliminated
and the compressor has been stopped for 3 minutes, the complete unit will resumes its previous
operation status.
During the cycle stage of operating 6 minutes and stopping 4 minutes, if antifreezing protection is
detected, the compressor and the outdoor fan will stop operation and the indoor fan will operate at low
speed. When the antifreezing protection is eliminated and the compressor has been stopped for 4
minutes, the complete unit will resume its previous operation state.
Tamb. Tpreset+2 , the unit will start drying operation. In this case, the indoor fan
Tamb
Tpreset +2 ˚C
Tpreset –2 ˚C
Compressor
Outdoor fan
Indoor fan
Run
6 min. 6 min.
4 min. 4 min.
low speed
Stop
Cooling
Drying
Stop operation
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