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6
ELECTRICAL SYSTEM
6 .1 Power supply
A detailed wiring diagram of the heating unit is shown in
caption 11, at the diagram and technical data section.
Installation of the heating unit requires connection to a
230V - 50Hz grid system and must be done with good
workmanship in conformity to the electrical regulatory
provisions in force.
It is best to install a differential circuit-breaker switch along
the line supplying power to the boiler.
b
Adapters, multiple sockets, extensions to feed the
appliance are not allowed.
b
Always check the effectiveness of the electricity
earthing system, compulsory for the appliance and
used for connecting up to the heating unit. The
electronics could in fact put the entire heating unit into
safety shutdown should the latter not be compatible.
b
Make sure that the water and heating pipes have not
been used as earths for the electrical installation.
They are absolutely unsuited for this usage.
Wiring at a voltage of 230 V must be separated from those
at a voltage of 24V, using raceways or separate PVC tubes.
Make sure that the electrical features (volt, absorption,
starting current, etc.) of the external electrical components
(thermoregulators, solenoid valves, weather probes, etc.)
are compatible with the inlets and outlets available before
connecting them up.
Relays and/or ancillary contactors are to be used to
connect up the external electrical components, which must
14
be installed on a special electrical board externally.
This solution also enables circulators, valves, etc. to
function in emergency mode, i.e. should the boiler master
board not be serviceable.
a
Do not touch the electrical apparatus with parts of the
body wet or damp or with bare feet.
a
Do not leave the appliance exposed to atmospheric
agents (rain, sun, wind, etc.) unless it is the special
model for out of doors.
a
It is forbidden to pull, detach, twist the wiring coming
out of the heating unit, even if unplugged from the
power supply.
a
Do not allow people without experience to use the
appliance and switch off the heating unit if the power
cable should break; call in qualified personnel to
replace it.
Always refer to the data given in the diagrams in this
handbook for operations of an electrical nature.
Remember that
damages caused by ignoring the information given in the
wiring diagrams of this manual.
is not to be held liable for any
B
a
Never turn off the boiler while it is functioning
normally (with burner ignited) suddenly cutting off the
power supply with the on-off switch. This could cause
abnormal overheating in the primary exchanger. Use
a room thermostat or remote control to turn off (whilst
heating system is on).
6 .2 Electrical connections
b
Qualified personnel only may work on the electrical
system and in compliance to provisions of the law,
with particular attention to rules on safety.
a
Lock the cables in their cable clamp designed to
ensure the latter are always in the correct position
inside the appliance.
6 .2 .1 Connection to mains
Connection must be made in compliance to regulatory
provisions in force on matters of electrical safety, with a
H05-VV-F-3GI multi-polar sheathed cable and minimum
conductor section of 1.5 mm
against humidity, abrasion and accidental contact.
The power cable must be connected to the terminal board
mounted on the DIN guide located on the right hand side
in the slave holder panel, located on the front of the boiler
under the control panel (see Figure 13).
Fix the cable by its cable clamp and supplied anchorages
to ensure it is correctly in place inside the appliance and
to prevent it from coming into contact with parts at high
temperatures (burner, etc.).
b
The earth conductor must be longer than the other
conductors (Phase, Neutral) so that the conductor
cables would the first to feel the strain should the
power cable become unplugged.
b
The rubber cable guides placed on the body of the
appliance must not be removed as their purpose is
to protect the cables from the wear generated by
direct contact between cable and appliance body.
It is sufficient to perforate the cable guide to pass
through a cable.
, appropriately protected
2
Figure 13
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