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9
C.2. - Electrical connection
Before working on the unit, switch o󰀨 the power supply and secure it against being
switched on again! Check for the absence of power! Electrical connections may
only be made by a specialist and in compliance with the applicable regulations. Do
not use the controller if the housing shows visible damage.
Caution
Danger
Low-voltage cables such as temperature sensor cables must be routed separately
from mains voltage cables. Feed temperature sensor cables only into the left-hand
side of the unit, and mains voltage cables only into the right-hand side.
Caution
Caution
Caution
Installation
The customer must provide an all-pole disconnecting device, e.g. a heating emer-
gency switch.
The cables being connected to the unit must not be stripped by more than 55mm,
and the cable jacket must reach into the housing just to the other side of the strain
relief.
Controller and VFS sensor have to have the same ground potential. The VFS
sensor uses a functional earth connector (PELV). The PE-connector of the
controller has to be connected to the pipe system near the sensor.
9


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