Service manual

12-7
CONTROL SYSTEM
SM DNGDCI 2-E.1 GB
12.2 Fan Mode
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 differencebetween
actual room temperature and user set point temperature.
12.3 Cooling Mode
NLOAD is calculated according to the difference between actual room temperature and user
setpoint 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.
12.4 Heating Mode
NLOAD is calculated according to the difference between actual room temperature and user setpoint
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
calculatedNLOAD.
12.5 Temperature Compensation
In wall mounted, ducted, and cassette models, 3 degrees are reduced from room temperaturereading
(except when in I-Feel mode), to compensate for temperature difference between high andlow 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
unitController
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
12.6 Indoor Fan Control in Heating Mode
Indoor fan speed depends on the indoor coil temperature:
CONTENT