8
Installation
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.
Caution
C.1. - Electrical connection
Danger
Before working on the unit, switch off 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
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
The customer must provide an all-pole disconnecting device, e.g. a heating
emergency switch.
Caution
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.
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