Power Supply - Viessmann Vitotronic 100 Installation And Service Instructions Manual

Power supply

Isolators for non-earthed conductors
■ The mains isolator or "Emergency stop" must simul-
taneously isolate from the power supply all non-
earthed conductors with a minimum contact separa-
tion of 3 mm.
We additionally recommend installing an AC/DC-
■
sensitive RCD, type B
that can occur with energy efficient equipment.
■ If no mains isolator or "Emergency stop" is set, iso-
late all non-earthed conductors simultaneously from
the power supply by means of an upstream circuit
breaker with a minimum contact separation of 3 mm.
Power supply for accessories and external compo-
nents
■ For accessories and external components that will
not be connected to the control unit, we recommend
making the power connection to the same MCB/fuse,
or at the very least in-phase with the control unit.
Connection to the same MCB/fuse provides addi-
■
tional safety in the event of the power being switched
off. Observe the power consumption of the connec-
ted consumers.
Additional regulations for oil and gas combustion
equipment
Observe the national combustion equipment ordi-
■
nance for your local region.
■ For oil and gas combustion equipment above
100 kW an "emergency stop switch" must be instal-
led outside the installation room, in line with the
Sample Combustion Ordinance "FeuVO".
For combustion equipment to EN 50156-1, the
■
"emergency stop switch" installed on site must com-
ply with the requirements of EN 50156-1.
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and in
appliance damage.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■ IEC 60364-4-41
VDE regulations
■
Technical connection requirements specified
■
by the local power supply utility
■ Protect the power cable on site with a
fuse/MCB of up to 16 A.
, for DC (fault) currents
Danger
The absence of system component earthing can
lead to serious injury from electric current if an
electrical fault occurs.
The appliance and pipework must be connected
to the equipotential bonding of the building.
Danger
Incorrect core assignment can result in serious
injury and damage to the appliance.
Never interchange cores "L" (brown) and "N"
(blue).
Colour coding to IEC 60757:
BN Brown (L)
BK Black
BU Blue (N)
GY Grey
GNYE Green/yellow (PE)
Recommended power cable
■ 3-core cable, flexible
■
Cable cross-section: 1.5 mm
■ Rated voltage: 300 V/500 V
Temperature resistance: Min. 70 °C
■
If the mains connection is made with a flexible power
■
cable, it must be ensured that the live conductors are
pulled taut before the earth conductor in the event of
strain relief failure. The length of the earth conductor
wire will depend on the design.
Electrical connections
2
25