Gree TERRA09HP230V1A Installation, Service & Troubleshooting page 30

Product Introduction
System Operation 18,000/24,000 btuh Models, cont.
Basic Functions
2) Dry Mode
Drying Process
This feature will not take the place of a dehumidifier, it is intended to dry the filer 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 3.60 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.
-3.60 F
Overcurrent Protection (Same as Cooling Mode)
3)Heating Mode
Heating Process
When the indoor ambient drops 20 F below the preset temperature, the unit will start the heating cycle. The outdoor fan,
compressor and 4-way valve will operate. The indoor fan will operate in the "Cold Air Prevention" mode in which the
indoor fan will have a 2 minute delay after the call for heating. The indoor evaporator coil temperature must reach 1040 F
before the indoor fan will start, this will prevent cold air from discharging from the indoor coil. When the indoor evapo-
rator coil temperature is > 1040 F, the indoor fan will operate at low speed for 1 minute. With 1 minute of operation or 2
minutes of no fan operation and the indoor evaporator coil temperature is > 1080 F, the indoor fan will operate at its preset
condition.
If the indoor ambient temperature is < 90 F and > 20 F of the preset temperature, the unit will run in its original mode of
operation.
If the compressor is running and the mode is changed from cooling to heating, the 4-way valve will be energized 2-3 min-
utes later.
If the indoor ambient temperature is >= 90 F than the preset temperature, the compressor will stop and the outdoor fan will
stop after a 30 second delay. The indoor fan will continue to operate at its preset mode.
The G10 technology will determine compressor frequency based on ambient temperatures.
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