21
Installation Instructions
ENGLISH
Attention!
Do not mix the heating water with in-
correct concentrations of antifreeze or
anti-corrosion substances! This could
damage the gaskets and cause noise
during operation.
La Unical AG s.p.A. will not be held
liable for damage to persons, animals
or objects due to failure to comply with
the above instruction.
- make sure that all the connections are watertight.
- after commissioning the boiler (see par. 3.10) and
bringing the system to the operating temperature,
stop the boiler and repeat the air bleed operations.
- let the system cool down and, if necessary, return
the water pressure to 0.8/1 bar.
(See par. 4.4).
3.7 - CONNECTION
Danger!
The gas connection must be carried out
only by a qualified installer who must re
-
spect and apply that foreseen by relevant
laws in force in the local prescriptions of
the supply company. Incorrect installation
can cause damage to persons, animals
and objects for which the manufacturer
cannot be held responsible.
If you smell gas:
a) Do not operate electric switches,
the telephone or any other object that
may cause sparks;
b) Immediately open doors and
windows to create air current
to purify the room;
c) Shut the gas cocks.
The mains pressure must be within 1 and 3
bar (in the event of greater pressure install
a pressure reducer).
M
FLOw
3/4’’
R
RETURN
3/4’’
G
GAs
3/4’’
C
HOT
1/2’’
F
COLD
1/2’’
sc BOILER DRAIN
Rc FILLING vALvE
svs sAFETY vALvE DRAIN
Provide a drain pipe with funnel and a trap
that lead to a suitable drain, in correspond-
ence of Svs.
This drainage must be controlled on sight.
If this precaution is not taken, triggering
of the safety valve can cause damage to
persons, animals and objects, for which
the manufacturer cannot be held respon-
sible.
When the system connections have been completed,
the circuit can be filled.
This operation must be performed carefully, respect-
ing the following phases:
- open the radiator vent valves and make sure the
automatic valve is working properly in the boiler.
- open the filling tap gradually, making sure that
the automatic air release valves installed on the
system work properly.
- close the radiator air release valves as soon as
water comes out.
- check the pressure gauge until pressure reaches
approximately 0.8/1 bar.
- close the filling tap and bleed air once again
through the radiator air release valves.
3.8 - FILLING THE sYsTEM
Unical AG s.p.A. declines every responsibility
in the case of damages to people, animals or
things, caused by the missed observance of the
above statement.
