Installation Instructions

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.
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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.