6.4.4 Connection of external inputs and
outputs
External switch inputs
X3
6
5
4
3
2
X4
+ 24 VDC
+ 24 VDC
+ 24 VDC
+ 24 VDC
+ 24 VDC
+ 24 VDC
1
1
Fig. 33: Wiring example of window contact
1
Connecting cable LiYCY 2 x 0.5 mm² (by others)
Terminal connections X3
No.
Function
Switch
Open
Closed
1
Fume cupboard
switch
Inactive
Active
2
Changeover
1
Heating
Cooling
3
Operating
enable
Off
Automatic
4
Fire emergency
stop
1
Off
Automatic
5
Window con-
tact
1
Off
Automatic
6
PIR sensor
Valid oper-
ating mode
Occupied
1 cable break safety device
External switch outputs
X5
7
6
5
4
3
2
1
X6
GND
GND
GND
GND
GND
GND
1
Fig. 34: Wiring example B alarm
1
Connecting cable LiYCY 2 x 0.5 mm² (by others)
Terminal connections X5
No.
Connection
Voltage /
Current consump-
tion
1
Requirements of coolant
1
24 VDC,
max. 250 mA
2
Requirements of heat
transfer fluid
1
3
Operational readiness
4
B alarm
5
A alarm
6
Enable heating ceiling
7
Enable chilled ceiling
1 changeover mode only
Installation
Making electrical connections > Connection of external inputs and outputs
Decentralised ventilation units SCHOOLAIR-S-HV
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