Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 43

Electrical connections
Boiler with flexible screw conveyor
Fig. 38
Drive, feed
A
Light barrier
B
Sensor
C
D Flexible screw conveyor drive
Note
Keep cables clear of rotating parts (e.g. chains, gears,
rotary lock valve).
Electrical connection
When connecting external switching contacts and
components to the safety extra low voltage circuit of
the control unit, observe the safety requirements of
protection class II, i.e. 8.0 mm air gap/creep path and
2.0 mm insulation thickness towards live components.
For all components provided on site, ensure safe elec-
trical separation in accordance with EN 60335 and
IEC 60065. This includes PCs and laptops.
(cont.)
1.
Line entry
E
Retaining plates
F
Ignition element
G
!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing any work, touch earthed
objects such as heating or water pipes to dis-
charge static loads.
Installation sequence
43