Making The Electrical Connections; Open The Control Unit Wiring Chamber - Viessmann VITOLIGNO 300-P Installation Instructions Manual

Making the electrical connections

When connecting external switching contacts or components to the low voltage circuit
of the control unit, please observe the safety requirements of protection class II, i.e.
8.0 mm air gap/creep path or 2.0 mm insulation thickness towards 'live' compo-
nents.
For all on-site components (incl. PC/laptops), ensure safe electrical separation to
EN 60 335 or IEC 65.
!
Please note
Electronic modules can be dam-
aged by electrostatic dis-
charges.
Before beginning work, touch
earthed objects, such as heating
or water pipes, to discharge static
loads.

Open the control unit wiring chamber

1.
Note
■ Only route cables and capillaries on
the r.h. or l.h. side of the boiler under-
neath the casing panels, and secure
these with cable ties.
■ Ensure that subsequent maintenance
work is not hindered by cables.
■ Never allow cables/leads to come into
contact with motors or hot boiler com-
ponents.
11