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A B
SD
Wiring terminal Function Remarks
1,2,3 Connections for EIA -485 1= Communication connection A/RT+, 2= Communication connection B/RT–, 3= GND/COM.
4,5 External stop Stops the air handling unit by opening the circuit. On delivery, this function is fitted with a jumper.
If the connection is interrupted, the air handling unit will stop.
6,7 External fire/smoke function 1 External fire and smoke function. On delivery, this function is fitted with a jumper. If the
connection is interrupted, the function will trip and initiate an alarm.
8,9 External fire/smoke function 2 External fire and smoke function. On delivery, this function is fitted with a jumper. If the
connection is interrupted, the function will trip and initiate an alarm.
10,11 External alarm 1 External contact function. Optional: Normally open/normally closed.
12,13 External alarm 2 External contact function. Optional: Normally open/normally closed.
14,15 External low speed External contact function. Overrides the time switch from stop to low speed operation.
16,17 External high speed External contact function. Overrides the time switch from stop or low speed to high speed
operation.
18,19 Demand control Input for 0-10 VDC. The input signal influences the supply air/extract airflow setpoint if the unit is
operating in the demand control mode. For connection of a sensor, for example CO2, CO and VOC
20,21 Circulation pump, heating circuit Independent contact, max. 5 A/AC1, 2 A/AC3, 250 VAC. Closes on a heating load.
22,23 Circulation pump, cooling
circuit or cooling on/off, 1-step
operation
Independent contact, max. 5 A/AC1, 2 A/AC3, 250 VAC. Closes on a cooling load.
24,25 Cooling, on/off, 2-step operation Independent contact, max. 5 A/AC1, 2 A/AC3, 250 VAC. Closes on a cooling load.
26,27 In-service indication Independent contact, max. 5 A/AC1, 2 A/AC3, 250 VAC. Closes when the unit is operating.
28,29,30 Damper control 24 VAC. 28= Controlled 24 VAC (G), 29= 24 VAC (G), 30= 24 VAC (G0).
31,32 Control voltage 24 VAC control voltage. Terminals 31-32 are loaded with a total of 16 VA. Opened by means of the
safety isolating switch.
33,34 Reference voltage Output for constant 10 VDC. Max. permissible load: 8 mA.
35,36,37,38 Control, recirculation damper The recirculation damper can be loaded with max. 2 mA at 10 VDC. 35= 24 V AC (G), 36= 24 V AC
(G0), 37= 0-10 V DC control signal, 38= 0-10 VDC feedback signal.
Digital inputs, terminals 4-17, are of extra-low voltage type.
Analogue inputs, terminals 18-19 have an input impedance of 66 kΩ.
The max permissible common load on terminals 31-32, outputs for Heat/Cool and damper output (terminals 28-30) is 50 VA.
The max. permissible load on the
corresponding connection is 16 VA.