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5 Assembly and installation
18 Installation instructions aroTHERM 0020147164_04
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 connec-
tion (underfloor protective
circuit)
3 eBUS connection in the
VWZ AI heat pump control
module or in the VWZ
MEH 61
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 mm²
Recommended cable dimension for
eBUS + limit thermostat
4 x 0.75 mm²
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 cable duct
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.
123456789101112131415
16
1
2
3
4
ØA
ØA
1
2
1 eBUS line and limit ther-
mostat line cable duct
2 Power supply cable duct
1. Measure the diameter of the cable.
2. Drill a hole the same size as the cable diameter in the
cable duct.
3. Route the cable through the cable duct.
4. Tighten the cable duct with two open-end spanners.
18


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