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7Installation Instructions VRC430 0020042468_02
Fig. 4.3 Fitting the external sensor VRC 9535
Key
1 Casing cover
2 Wall plinth
3 Cap nut for cable conduit
4 Connection cable with drip loop
5 Installation opening
Proceed as follows:
Mark the position on the wall. Observe the cable
routing for the external sensor.
Route the connection cable (4) with a slight incline
to the outside and with a drip loop.
Remove the cover (1) from the external sensor cas-
ing.
Drill two holes 6 mm in diameter to match the
fixing apertures (5).
Insert the rawl plugs supplied.
Fix the wall socket (2) to the wall with 2 screws. The
cable entry must point downwards.
Release the cap nut (3) slightly and push the con-
nection cable through the cable entry from below.
The electrical installation is described in Chapter 5.2
for the VRC 693, and in Chapter 5.3 for the
VRC 9535 .
Re-tighten the cap nut (3). The packing in the cable
entry adapts to the diameter of the cable used
(Cable diameter: 4.5 to 10 mm).
Carefully push the cover for the enclosure onto the
wall socket until it clicks in position. Do not forget
the seal between the wall socket and the cover for
the enclosure.
5 Installation
e
Danger!
Live connections!
There is a danger to life from electrocution
when working on the electronics box of the boil-
er.
Switch off the power supply to the electronics
box of the heating unit and secure against re-
connection before carrying out any work.
Only open the electronics box if the heating
unit is disconnected from the power source.
If the controller is installed in the heating unit, the elec-
trical connection is made by the contact between the
pin rail of the controller and the corresponding plug
connection in the heating unit.
5.1 Electrical installation of the controller when
mounted on the wall
The power supply to the heating unit is switched off and
secured against re-connection.
1
2
Fig. 5.1 Electrical connection with VRC 430
Key
1 Terminal rail VRC 430
2 Heating unit terminal rail
Assembly 4
Installation 5
27


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