Basic Functions 9,000/12,000 Btuh Systems - Gree TERRA09HP230V1A Installation, Service & Troubleshooting

Product Introduction
System Operation 9,000/12,000 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 runtime of 6 minutes regardless of room temperature.
1) Cooling Mode
Cooling Process
When the indoor ambient rises 20 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
appropriate temperatures and pressure and adjust the compressor speed and the EEV as required. If the indoor ambient is
> 20 F then the preset temperature, the compressor will increase the frequency; < 20 F the compressor will begin reducing
the frequency. The G10 technology will control compressor speed based on indoor load and compressor amperage. When
the indoor temperature is satisfied, the compressor will stop, then 30 seconds later the outdoor fan will stop.
Evaporator Freeze Protection
The software will monitor the indoor evaporator coil form freezing.
The following will occur 6 minutes after the compressor has been operating in the cooling or dry mode:
If the evaporator temperature drops below 360 F, the compressor will operate at a reduced frequency. If the evaporator
is below 300 F for 3 minutes, the compressor will stop, 30 seconds later the outdoor fan will stop. In cooling mode, the
indoor fan and swing motor will remain on. If the evaporator temperature is >= 500 F and the compressor is off for at least
3 minutes, the compressor will resume its normal operation state.
Overcurrent Protection
The software will monitor the compressor current to maintain it in a safety and reliable operating range.
If the total current <= 6 amps, the compressor speed frequency is allowed to increase. If the current >= 7 amps, the
compressor speed frequency will not increase. If the total current >= 8 amps, the unit will operate and decrease the
compressor speed. If the current >= 9 amps, the compressor will stop and the indoor fan will stop after 30 seconds.
2) Dry Mode
Drying Process
This feature will not take the place of a dehumidifier, it is intended to dry the filter and slightly cool the air. If the indoor
ambient temperature is greater than the preset temperature, the unit will enter the cooling and drying mode, in which
case the compressor will operate and the indoor fan will run at a low speed. When the indoor ambient temperature is at or
below the preset temperature, the unit will operate in it previous running state. When the indoor ambient drops to more
than 20 F below the preset temperature the compressor will stop running, then 30 seconds later the outdoor fan will stop,
the indoor fan will run at low speed.
- 20 F
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