Power Supply; Routing Connecting Cables/Leads - Viessmann Vitodens 050-W Installation And Service Instructions Manual

Installation sequence
Electrical connections

Power supply

Power supply
fÖ
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and dam-
age to the appliance.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■ IEC 60364-4-41
■ IEEE Wiring Regulation; BS 7671:2018
Connection conditions of the local grid opera-
■
tor
■ Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage cate-
gory III (3 mm) for complete isolation. The isolator
must be fitted in the permanent electrical installation,
in line with installation requirements.
We also recommend installing a pulse current-sensi-
tive RCD (RCD class A
■ Connect the power cable to the electricity supply
using a fixed connection.

Routing connecting cables/leads

!
Please note
If closures or diaphragm grommets are dam-
aged, splashproofing is no longer ensured.
Do not open or damage closures or unused dia-
phragm grommets on the underside of the appli-
ance. Seal cable entries with fitted diaphragm
grommets.
Fig. 18
26
(cont.)
).
If the power supply to the appliance is connected
■
with a flexible power cable, ensure that the live con-
ductors 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.
■ Max. fuse rating 16 A.
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.
Bundle cables using the supplied cable clips.
Route extra low voltage (ELV) leads < 42 V separately
from cables 42 V/230 V~.
>
Secure the cable clips on the underside using the sup-
plied screws.
Do not route cables/leads over sharp edges or against
the casing (sound transmission).
!
Please note
If connecting cables/leads come into contact
with hot components, they will be damaged.
When routing and securing cables/leads on site,
ensure that the maximum permissible tempera-
tures for these cables/leads are not exceeded.