Gree GWH12TB-D3DNA1A - System Operation 18,000;24,000 btuh Models; Basic Functions

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System Operation 18,000/24,000 btuh Models
 e compressor should stay o for at least 3 minutes before starting the unit.  e compressor circuit has a 3 minute delay if
the compressor is de-energized during a run cycle. If the compressor starts from a de-energized cycle, there will be no time
delay.  e compressor has a minimum run time of 6 minutes regardless of room temperature.
1) Cooling Mode
Cooling Process
When the indoor ambient rises 5 F above the preset temperature, the unit will start the cooling cycle.  e outdoor fan and
compressor will start.  e indoor fan will run continuously at the selected speed.  e outdoor unit will monitor the appro-
priate temperatures and pressure and adjust the compressor speed and the EEV as required. If the indoor ambient is > 5
F then the preset temperature, the compressor speed will increase; < 5 F the compressor will begin reducing it’s speed.  e
G10 technology will control compressor speed based on indoor load and compressor amperage. When the indoor tempera-
ture is satis ed, the compressor will stop, then 30 seconds later the outdoor fan will stop.
Evaporator Freeze Protection
 e so ware will monitor the indoor evaporator coil for freezing.
In Cooling or Dry mode, if the Indoor tubes are < 32 F, for 3 consecutive minutes, the compressor will stop.  e compres-
sor will start when the tubes are above the calculated temperature limit. If the indoor tubes are < 43 F,
the compressor will adjust it’s speed as needed. If the unit has stopped 6 times repeatedly, the unit will stop and a fault code
will be displayed.  e unit will need to be turned o , then back on to reset. As the compressor runs in normal mode, the
number of faults will be cleared, they may also be cleared by switching from fan mode to heat mode.
Overcurrent Protection
 e so ware will monitor the compressor current to maintain it in a safety and operating range.
If the total current >= 17 amps, the compressor will stop and the indoor fan will stop a er 30 seconds.  e system can
resume a er a 3 minute startup delay.
- 5.4 F
Basic Functions
Product Introduction