6 Start-up
16
Installation instructions aroTHERM 0020147164_09
5.4.3
Laying the 24 V cabling
PE N L
230 V~
+ -
Bus
VF1
SP1
PE N L
230 V~
PE N L
MA1
PE N L
MA2
PE N Auf Zu
UV1
PE N 1 2
ZH
2 1
2 1
X4
X9
EBUS
X7
FLOOR H
3
1
2
1
eBUS connection in the
heat pump (observe the
polarity)
2
Limit thermostat con-
nection (underfloor pro-
tective circuit)
3
eBUS connection in
the VWZ AI heat pump
control module or in the
hydraulic station
1.
Feed the cable through the cable duct.
VWL 55/2 A 230 V
VWL 85/2 A 230 V
VWL 115/2 A 230 V
VWL 155/2 A 230 V
Recommended eBUS cable dimen-
sion
2 x 0.75 mm
²
Recommended cable dimension for
eBUS + limit thermostat
4 x 0.75 mm
²
2.
Connect the eBUS cable to the system controller.
3.
If you install a limit thermostat (e.g. 50 °C) in the heat-
ing circuit flow, remove the bridge from terminal
(2)
and
connect the limit thermostat to this terminal.
5.4.4
Installing the grommet
Caution.
Risk of malfunction due to incorrect rout-
ing of the supply lines.
If you route the supply lines for the power
supply and the eBUS line through the same
cable duct, the signal will be disrupted.
▶
Route the supply lines for the power sup-
ply and the eBUS line through various
cable ducts in the product.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
ØA
ØA
1
2
1
eBUS line and limit
thermostat line grommet
2
Power supply grommet
1.
Measure the diameter of the cable.
2.
Drill a hole the same size as the cable diameter in the
grommet.
3.
Route the cable through the grommet.
4.
Tighten the grommet with two open-ended spanners.
6
Start-up
6.1
Run the start-up
1.
Before starting up the product, read through the operat-
ing instructions.
2.
Check that the electrical partition is installed.
3.
Check that the hydraulic and electric connections are
correctly designed.
4.
Check that a dirt filter is installed in the heat pump re-
turn.
5.
Check whether an expansion relief valve, an expansion
vessel and a pressure gauge are installed.
6.
Check the leak-tightness of the connections.
7.
Open all the heating circuit valves.
