Sinclair SDV 6 Service Manual page 46

6.4 Fan Control
6.4.1 Fan speeds control
The IDU can work in seven-speeds or three-speeds.

Seven-speeds
When the Indoor Unit detects seven wind speeds the wind speed is set as follows.
Sleep Speed 1

Three-speeds
When the Indoor Unit detects only three wind speeds the wind speed is set as follows.
Sleep Speed 1
For the specific IDU series, please consult the technical manual of each series. The following table describes the fan control
in different situations

Fan control in different situations
IDU Status
Operating Operating
in Set Standby
Speed Off
Fault
IDU Status
Operating
Automatic
Standby
Fan Speed
Off
Fault
Note:
Termal: In the heating mode, The IDU in the standby state heating mode will run fan periodically at speed 1 for one minute (the period can be set by controlle)
6.4.2 Auto fan control mode
1. When set auto fan control in cooling or heating mode. After operation in the initial speed for a period of time, when
Thermal ON, IDUs enter the auto mode and the fan speed will be changed every 2 minutes or when Ts change.
2. When Thermal OFF, IDUs enter the standby mode. When Thermal ON, IDUs enters the initial fan speed again.
3. The default speed is speed 1 when IDUs are set auto fan mode in Air supply only mode.
Speed 2 Speed 3 Speed 4
Speed 4 Speed 7
Cooling Mode Dry Mode
Set speed Speed 1
Set speed Speed 1
Stop fan Stop fan
Stop fan Stop fan
Cooling Mode Heating Mode
Automatic Automatic
Automatic Termal
Stop fan Stop fan
Stop fan Stop fan
Speed 5 Speed 6
Auto
Heating Mode
Set speed
Termal
Stop fan
Stop fan
Auto Mode
Automatic
Automatic cooling, automatic fan speed,
automatic heating, and Termal mode
operating
Stop fan
Stop fan
Speed 7 Auto
Fan Mode
Set speed
/
Stop fan
Stop fan
Fan Mode
Speed 1
/
difference of the set
Stop fan
Stop fan
Speed Switch
User set
Speed Switch
Switch fan speed
based on the
temperature and
return air
temperature
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