Basic Functions 18,000/24,000 Btuh Systems - Gree TERRA09HP230V1A Installation, Service & Troubleshooting

Product Introduction
System Operation 18,000/24,000 btuh Models
Basic Functions
The compressor should stay off for at least 3 minutes before starting the unit. The 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. The compressor has a minimum run time of 6 minutes regardless of room temperature.
1) Cooling Mode
Cooling Process
When the indoor ambient rises 50 F above the preset temperature, the unit will start the cooling cycle. The outdoor fan and
compressor will start. The indoor fan will run continuously at the selected speed. The 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 > 50
F then the preset temperature, the compressor speed will increase; < 50 F the compressor will begin reducing it's speed. The
G10 technology will control compressor speed based on indoor load and compressor amperage. When the indoor tempera-
ture is satisfied, the compressor will stop, then 30 seconds later the outdoor fan will stop.
- 5.40 F
Evaporator Freeze Protection
The software will monitor the indoor evaporator coil for freezing.
In Cooling or Dry mode, if the Indoor tubes are < 320 F, for 3 consecutive minutes, the compressor will stop. The compres-
sor will start when the tubes are above the calculated temperature limit. If the indoor tubes are < 430 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. The unit will need to be turned off, 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
The software 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 after 30 seconds. The system can
resume after a 3 minute startup delay.
29