12-5
CONTROL SYSTEM
SM OU12HP 2-E.2 GB
(2) Thermistor is defined as faulty (shorted/disconnected) if it’s faulty for more than 10
seconds continuously. During this time, the system uses the last valid temperature.
12.4 Indoor Unit Control
12.4.1 Indoor Fan Control
When user sets the indoor fan speed to a fixed speed (Low/ Medium/ High), unit will operate
constantly at set speed.
When Auto Fan is selected, indoor fan will operate in all speeds according to the cool/heat
load.
12.4.2 Load calculation
LOAD 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
LOAD.
12.4.3 Heat Mode
12.4.3.1 Temperature Compensation
A compensation value of 2-4 degrees is 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 closing/opening J2 on the indoor
unit controller.
12.4.3.2 Indoor Fan Control in Heat Mode
When in heat mode, including protections and except Deicing, and when the conditions
in the table below are fulfilled, IFAN will be working according to the graph below.
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