Sinclair SDV 6 Service Manual page 54

6.11 High ceiling setting
For embedded IDU series, such as Compact Four-way Cassette and Four-way Cassette, when the installation exceeds the
specified height (default 3 meters), can enter the High ceiling setting ( The parameter code is"N31" ) to change . 3 meters
high height, 4 meters high height or 4.5 meters high height can be set. When the high ceiling control is entered, the fan
speed limits the minimum speed 3 operation.
*Note: Refer to the IDU manual for detail
6.12 Remote on/off control
Both IDU'S main control board and 1# Expansion board (Optional) have remote on/off control port

Remote on/off control port selection
①Port on IDU'S main control board
Port CN55 connects the passive switch signal
Note:
The port on the main board will be disabled when the port on the expansion board is enabled
②Port on 1# Expansion board (Optional)
Port CN7 connects the 220V switch signal. For detail refer to Expansion board manual

Setting positive or negative logic
①Port on IDU'S main control board
The positive and negative logic of the IDU main control board is set by the wired controller or central controller. (N38)
②Port on 1# Expansion board (Optional)
The positive and negative logic of the 1# expansion board is set by the S4-1 DIP switch on the 1# expansion board.

Remote on/off port setting status and its corresponding function
Outdoor
unit
Set
Set to
Positive logic
(Default) Input Low level
Set to
negative disconnected,
logic Input High level
The remote OFF delay time can be set through the wired controller (N39), the default value is 0
Corresponding
Port status
function
Remote delay
The port is
OFF control
connected,
Remote OFF
control
Remote delay
The port is
OFF control
Remote OFF
control
Functional interpretation
Shut down after the delay time, the controller can send
commands normally, but the indoor unit remains off.
Direct shutdown without delay, the controller can send
commands normally, but the indoor unit remains off.
Shut down after the delay time, the controller can send
commands normally, but the indoor unit remains off.
Direct shutdown without delay, the controller can send
commands normally, but the indoor unit remains off.
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