Gree CE52-24/F(C) Owner's Manual page 26

5.3.1 General Control Parameters
(1) ON/OFF
Press the on/off button to turn unit on or off.
When unit is turned off, mode, temperature, fan speed and swing can't be set.
(2) Mode setting
Press the Mode buttons to set operation mode.
Modes for indoor units of different series are not all the same.
If a certain mode is not available in the indoor unit, the icon of the corresponding
mode cannot be selected.
NOTES:
① Auto mode can only be set in the master indoor unit.
② Heat recollection system have no master indoor unit. When the indoor unit
of the same branch is connected into one indoor unit, the auto mode can
be set; when the quantity of indoor unit in the same branch is more than
one set, the auto mode cannot be set; other modes can be freely switched.
(3) Temperature setting
Fig.5.2 Control Page of Single IDU
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Centralized Controller