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Vaillant sensoCOMFORT VRC 720/3 Manual De Uso E Instalación página 76

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3
-- Electrical installation, set-up
Only qualified electricians may carry out the electrical install-
ation.
The heating installation must be decommissioned before
work is carried out on it.
3.1
Determining the system control's
installation site
Condition: Working Adaptive heat curve:, Room temp. mod.:, Dew point
monitoring:, Zone assignment:
Install the system control in a living room in the selected
zone.
Condition: Not working Adaptive heat curve:, Room temp. mod.:, Dew
point monitoring:, Zone assignment:
Install the system control in a suitable room, in which the
end user can operate the system control well.
3.2
Requirements for the eBUS line
Observe the following rules when routing the eBUS lines:
Use twin-core cables.
Never use shielded or twisted cables.
Use only appropriate cables, e.g. NYM or H05VV (-F/-U).
Observe the permissible total length of 125 m. In this
case, a conductor cross-section of ≥ 0.75 mm² up to
50 m total length and a conductor cross-section of
1.5 mm² from 50 m.
In order to prevent faults in the eBUS signals (e.g. due to
interferences):
Maintain a minimum clearance of 120 mm to power sup-
ply cables or other electromagnetic sources of interfer-
ence.
For parallel routing to mains connection lines, guide the
cables in accordance with the applicable regulations, e.g.
on cable trays.
Exceptions: For wall breaks and in the electronics box, it
is acceptable to not reach the minimum clearance.
3.3
Requirements for the sensor cable
Observe the following rules when routing the sensor lines:
Use twin-core cables.
Never use shielded or twisted cables.
Use only appropriate cables, e.g. NYM or H05VV (-F/-U).
Observe the permissible total length of 50 m.
In order to prevent faults in the sensor signals (e.g. due to
interferences):
Maintain a minimum clearance of 120 mm to power sup-
ply cables or other electromagnetic sources of interfer-
ence.
For parallel routing to mains connection lines, guide the
cables in accordance with the applicable regulations, e.g.
on cable trays.
Exceptions: For wall breaks and in the electronics box, it
is acceptable to not reach the minimum clearance.
76
3.4
Connecting the system control
Connect the eBUS line to the eBUS terminals in the sys-
tem control's wall base.
3.4.1
Connecting a system control to the heat
generator
Connect the eBUS line to the heat generator's eBUS
terminals, as described in the installation instructions
for the heat generator and in Basic system diagram and
wiring diagram (→ Section 4.9.1).
3.4.2
Connecting a system control to the
ventilation unit
1.
Connect the system control to the ventilation unit as
described in the installation instructions for the ventila-
tion unit.
Condition: Ventilation unit connected to the eBUS without VR 32, Ventila-
tion unit without eBUS heat generator
Connect the eBUS line to the eBUS terminals in the sys-
tem control's wall base.
Connect the eBUS line to the eBUS terminals on the
ventilation unit.
Condition: Ventilation unit connected to the eBUS with VR 32, Ventilation
unit with up to two eBUS heat generators
Connect the eBUS line to the eBUS terminals in the sys-
tem control's wall base.
Connect the eBUS line to the eBUS of the heat gener-
ator.
Set the address switch for the VR 32 in the ventilation
unit to position 3.
Condition: Ventilation unit connected to the eBUS with VR 32, Ventilation
unit with more than two eBUS heat generators
Connect the eBUS line to the eBUS terminals in the sys-
tem control's wall base.
Connect the eBUS line to the common eBUS on the heat
generator.
Determine the highest possible position on the address
switches of the VR 32 for the connected heat generator.
Set the address switch of the VR 32 in the ventilation unit
to the second highest position.
Operating and installation instructions 0020287900_03

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