Service manual

15-5
CONTROL SYSTEM > GC 24
SM HADDCI 1-A.2 GB
15.4.1.1 Turbo Speed
The Turbo speed is activated during the first 30 minutes of unit operation when auto fan speed is
selected and under the following conditions:
Difference between set point and actual room temperature is higher than 3 degrees. Room
temperature is higher than 22°C for cooling or less than 25°C for heating.
15.4.2 Cool Mode
NLOAD is calculated according to the difference between actual room temperature and user set point
temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the calculated
NLOAD.
15.4.3 Heat Mode
NLOAD is calculated according to the difference between actual room temperature and user set point
temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the calculated
NLOAD.
15.4.3.1 Temperature Compensation
In wall mounted, ducted, and cassette models, 3 degrees are reduced from room temperature reading
(except when in I-Feel mode), to compensate for temperature difference between high and low areas
in the heated room, and for coil heat radiation on room thermistor.
The temperature compensation can be enabled/disabled by shortening of J2 on the indoor unit
controller.
Model J2 Shorted J2 Opened
Wall mounted Compensation Disabled Compensation Enabled
Cassette Compensation Enabled Compensation Disabled
Ducted Compensation Enabled Compensation Disabled
Floor/Ceiling Compensation Disabled Compensation Enabled
15.4.3.2 Indoor Unit Control in Heat Mode
Indoor fan speed depends on the indoor coil temperature
ICTST ICTVL ICTL ICTH ICTT
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