REXNOVA ISA 20 BITHERMAL, Installation, Use And Maintenance Manual

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Pict. 14
Pict. 15
CONNECTION TO THE MAINS ELECTRICAL SYSTEM
Check that all connections are
perfectly tight before opening
the boiler’s gas connection.
C h e c k t h a t a l l d e v i c e s
n e c e s s a r y f o r c r e a t i n g
and limiting the maximum
permissible pressure of the
relative gas are installed
i n t h e s y s t e m b e f o r e
opening the boiler’s gas
connection.
Another important feature to comply with
for achieving the full system’s safety is the
boiler’s correct connection to the mains
electrical supply in accordance with all
applicable regulations: in particular, the
boiler must be connected to a suitable
protective earthing system.
The device is fitted with a three-core
electrical cable supplied without a plug.
It must be connected to the mains with
a dedicated connection via dual-pole
switch whose contacts have an opening
of at least 3 mm. It is important to respect
the correct polarity (LIVE: brown cable
/ NEUTRAL: blue cable / EARTH: yellow-
green cable) when wiring in the boiler.
When installing or replacing the power-
supply cable, the earth conductor must
be left 2 cm longer than the others. If it
is necessary to completely replace the
pre-wired power-supply cable, the PCB
compartment will have to be accessed:
• Cut power to the boiler using the power
switch installed before it.
• Remove the lower cover by removing
the four screws; turn the instrument panel
to the open position.
• Remove the rear case cover by
unscrewing the 4 screws.
• Identify the terminals next to the PCB
(Pict. 16) and disconnect the live, neutral
and earth poles of the pre-wired cable;
remove the cable; connect the new cable
in the same position.
For the connections or the replacement of
conductors, use H05VV-F, H05VVH2-F CEI EN
60228 class cables or superior.
• Close the rear cover and screw it closed.
• Return the panel to its operational position
and reposition the lower protection.
Do not use the gas supply
pipework connections as earth
points for electrical equipment.
Always install a gas shut-off
valve before the device. This
must have a YELLOW valve
handle and must be placed
in a position which allows full
access to it.
Pict. 16
L
N