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Installation sequence
Electrical connections
C
D
Fig. 21
Retaining plates
A
Cable entry on the feed system
B
Upper cable entry
C
■
Only attach leads in the boiler to retaining plates
■
Only run leads from accessories through cable
entries
and
.
B
C
If possible, route cables/leads along the cable chan-
■
nel on the feed system.
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.
!
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.
30
(cont.)
E
B
A
.
A
Inserting cables into the control unit enclosure and
applying strain relief
!
Please note
Unsealed apertures in the control unit enclosure
can damage the system.
Blank off unnecessary apertures in the control
unit enclosure with unopened cable grommets.
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