6
1.3.2.
Ventilation unit's switching space
Modbus extender
It is a communication card that connects the ventilation
unit's components to the control unit.
The card has a number of dipswitches called 'USER' that are
used to configure the unit, depending on the type of heating
coil installed.
Dipswitch no.
ON
OFF
1
Heating coil
No heating coil
2
Electric heating coil
Water heating coil
3
-
Must be OFF
4
-
Must be OFF
The second dipswitch and the rotary switches marked
'FACTORY' are factory-set and must not be changed.
The card's components have the following functions.
Component
Function
P1
Power supply
P2
Control signals to heating coil
P3
Control signals to rotor and temperature sensor
P4
Communication connection
P5
Communication connection
P6
Communication connection
P7
Communication connection
P8
Control signals to fans
Q1
Differential pressure monitor for flow
measurement on supply air fan
Q2
Differential pressure monitor for flow
measurement on extract air fan
FP1
Differential pressure monitor for supply air filter
FP2
Differential pressure monitor for extract air filter
Power supply board
It is a circuit board that distributes the power supply to the
components of the ventilation unit (not the electric heating
coil) and control cabinet. There is also a terminal block for
the components required to regulate a water heating coil.
The board's components have the following functions.
Component
Function
P1
Terminal block for power supply
P2
Terminal block for protective earth (PE)
P3
Terminal block for water heating coil
P4
Power supply to modbus extender
P5
Power supply to control cabinet
P6
Control signals to heating coil
P7
Control signals to heating coil
P8
Power supply to rotor control
P9
Power supply to supply air fan
P10
Power supply to extract air fan
Terminal block P3 has the following signals:
Block no.
Function
1
Valve motor - G0
2
Valve motor - 24V+
3
Valve motor - G0
4
Valve motor - control signal 0-10V
5
G0 (for F10 or B5)
6
Overheating thermostat F10
7
Return water sensor B5
8
No connection
9
N
10
Pump motor - relay contact
11
Pump motor - relay contact
12
L
13
N
14
L
FP1
FP2
Q1
Q2
P3
P2
P1
FACTORY
USER
P8
P6
P7
P4
P5
1
2
3
4
1
2
8
9
3
4
10
11
5
6
12
13
7
14
1
2
5
6
3
4
7
8
10
9
5
4
8
7
3
2
6
1
P
1
P2
L1 L
2
L
3
N
PE
PE
PE
P3
P4
P5
P6
P
7
P8
P9
P
1
0
1
2
3
4
5
6
7
8
9
1
0
11 1
2
1
3
1
4
1
8
2
9
3
1
0
4
11
5
1
2
6
1
3
7
1
4
1
8
2
9
3
1
0
4
11
5
1
2
6
1
3
7
1
4
1
4
2
5
3
6
1
3
2
4
3
4
1
2
1
2
3
4
5
1
2
3
4
5
