Pr
e-hea
t/cool
Afterhea
ter
Alarm
Input
CO
₂
Aux
After
cooler
J6
J11
J7
J8
J9
J10
J12
J13
P
ow
er In
24VDC
24VDC
24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+
D-
T
Fire
Therm
+
-
+
-
Input
Damper 1
Open
Open
Damper 2
ModBus
1
+
2
+
T1GTC
+16V
Standby
Switch
Hygro-
stat
Fail
Alarm
Filter
Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 - 10V
0 - 10V
J1
J2
J3
J4
J5
A
1
A
2
1
2
A
1
A
2
1
3
2
C
oi
l dri
ve
r
For information on the connection, please consult the installation and operating instructions of the
ventilation unit.
6.1 Modbus (connection to the ventilation unit)
Since the external control unit delivered with the profi-air 180 flat ventilation unit also uses the Modbus interface on the mainboard,
it must also be connected to the clamping points of the connection box on site. Please observe the colour coding of the wires.
The input can be used to connect the fire / smoke alarm with a relay output. When delivered, the contact is furnished with a
bridge. If this contact is interrupted by, e.g., a triggered fire / smoke alarm, the control system deactivates the ventilation unit.
In order to put the ventilation unit back into operation, it must be completely disconnected from power supply for a short period
of time.
6.2 Fire / smoke alarm input
To use the function, the contact must be connected to the break-contact relay (see illustration), and the factory-provided
bridge must be removed. If the relay is in a “live” state, the contact is closed. If the current at the relay drops, the contact will
be broken and the ventilation unit will be deactivated. The J2 contact is operated at a maximum of 24 V DC/300 mA.
The Modbus connection is used to connect the connection box to the mainboard of the ventilation unit.
6 Wiring diagrams
Installation instructions / operating instructions – profi-air flat / flex connection box
6
