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6 Start-up
5.4.3
Laying the 24 V cabling
230 V~
230 V~
PE N
L
PE N
L
PE N
X7
FLOOR H
2
X4
EBUS
1
X9
1
eBUS connection in the
heat pump (observe the
polarity)
2
Limit thermostat con-
nection (underfloor pro-
tective circuit)
1.
Feed the cable through the cable duct.
Recommended eBUS cable dimen-
sion
Recommended cable dimension for
eBUS + limit thermostat
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.
16
3
MA1
MA2
UV1
ZH
Bus
VF1
L
PE N
L
PE N Auf Zu
PE N 1
2
+ -
2 1
3
eBUS connection in
the VWZ AI heat pump
control module or in the
hydraulic station
VWL 55/3 A 230 V
VWL 85/3 A 230 V
2 x 0.75 mm²
4 x 0.75 mm²
Ø A
SP1
2 1
1
2
4
3
1
eBUS line and limit
thermostat line 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.
Installation instructions aroTHERM 0020217827_03
Ø A
1
2
Power supply grommet
2
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