50
INSTALLERUSER
MAINTENANCE TECHNICIAN
3
CONTROL AND
MAINTENANCE.
- Using an omnipolar disconnector,
check connection to 230V-50Hz
mains power supply, correct L-N
polarity and the earthing connection;
- make sure the central heating system
is lled with water and that the ma-
nometer of the Internal Unit indicates
a pressure of 1÷1.2 bar;
- make sure that the air vent valve cap
(if present) is open and that the sys-
tem is well deaerated;
- check tightness of water circuits;
- check the correlation between the
electric and hydraulic connections;
- with request for heat in TA zone 1
and TA zone 2, check that the mixing
valve opens and closes properly; open
the latter to check the intervention
of the system safety thermostat (the
Internal Unit ow temperature must
be set over 60 °C).
Even if just one single safety check
provides a negative result, do not com-
mission the system.
N.B.: the 16 l DHW (Domestic hot
water) expansion vessel is connected to
the hydronic unit via a exible hose; in
the event of maintenance it is possible
to temporarily move the vessel by un-
screwing the lock nut that fastens it to
the relative supporting bracket.
3.1 PROGRAMMING.
See indications in the Internal Unit in-
struction booklet.
3.2 WIRING DIAGRAM.
See indications in the Internal Unit in-
struction booklet.
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