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System water pressure adjustment
The filling pressure read on the boiler water gauge with the system cold must be approx
1.0 bar. If the system pressure drops to values below minimum, the boiler stops and the
display shows fault F37. Operate the filling knob detail 1 fig. 13, and bring it to the initial
value. Always turn it off it afterwards.
Once the system pressure is restored, the boiler will activate the 300-second air venting
cycle indicated on the display by FH.
1
fig. 13 - Filling knob
3. INSTALLATION
3.1 General Instructions
BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSON-
NEL, IN ACCORDANCE WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL
MANUAL, THE PROVISIONS OF CURRENT LAW, THE PRESCRIPTIONS OF NA-
TIONAL AND LOCAL STANDARDS AND THE RULES OF PROPER WORKMANSHIP.
3.2 Place of installation
B
The combustion circuit is sealed with respect to the place of installation
and therefore the unit can be installed in any room. The place of installa-
tion, however, must be sufficiently ventilated to prevent the creation of
dangerous conditions in case of even small gas leaks. This safety precau-
tion is required by EEC Directive No. 2009/142 for all gas units, including
so-called sealed chamber units.
The unit is suitable for operation in a partially protected place in accordance with EN 297/
A6, with minimum temperature of -5°C. If provided with the special antifreeze kit it can
be used with minimum temperature to -15°C. It is advisable to install the boiler under the
slope of a roof, inside a balcony or in a protected recess.
The place of installation must be free of flammable materials, objects and dusts or cor-
rosive gases.
The boiler is arranged for wall mounting and comes as standard with a hooking bracket.
Wall fixing must ensure stable and effective support for the generator.
If the unit is enclosed in a cabinet or mounted alongside, there must be suffi-
A
cient space for removing the casing and for normal maintenance activities
3.3 Plumbing connections
Important
B
The safety valve outlet must be connected to a funnel or collection pipe to pre-
vent water spurting onto the floor in case of overpressure in the heating circuit.
Otherwise, if the discharge valve cuts in and floods the room, the boiler manu-
facturer cannot be held liable.
B
Before installation, flush all the pipes of the system thoroughly to remove any
residuals or impurities that could affect proper operation of the unit.
In case of replacement of generators in existing installations, the system must
be completely emptied and cleaned of any sludge and pollutants. For that pur-
pose only use suitable guaranteed products for heating systems (see next sec-
tion), that do not harm metals, plastics or rubber. The manufacturer declines
any liability for damage caused to the generator by failure to properly
clean the system.
Carry out the relevant connections according to the diagram in fig. 30 and the symbols
on the unit.
Antifreeze system, antifreeze fluids, additives and inhibitors
When necessary, antifreeze fluids, additives and inhibitors can be used only if the man-
ufacturer of such fluids or additives guarantees that they are suitable and do not cause
damage to the exchanger or other components and/or materials of the boiler and system.
Do not use generic antifreeze fluids, additives or inhibitors that are not specific for use in
heating systems and compatible with the materials of the boiler and system.
Water system characteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO
water in order to avoid possible scaling in the boiler.
3.4 Gas connection
B
Before making the connection, ensure that the unit is arranged for operation
with the type of fuel available.
The gas must be connected to the relevant connection (see fig. 30) in conformity with the
current standards, using a rigid metal pipe or a continuous surface flexible s/steel tube
and installing a gas cock between the system and boiler. Make sure all the gas connec-
tions are tight.
20
EN
3.5 Electrical connections
Important
B
B
Room thermostat (optional)
B
Accessing the electrical terminal block
The electrical terminal block (fig. 14) can be accessed after removing the front panel (***
'Opening the front panel' on page 26 ***). The layout of the terminals for the various con-
nections is also given in the wiring diagram in fig. 35.
), use suitably treated
3
cod. 3541I691 - Rev. 00 - 01/2017
SILVER 24T - 34T
The unit must be connected to an efficient grounding system in accordance with
current safety regulations. Have the efficiency and suitability of the grounding
system checked by professionally qualified personnel; the Manufacturer de-
clines any liability for damage caused by failure to ground the system.
The boiler is prewired and provided with a "Y" type cable (without plug) for con-
nection to the electric line. The connections to the grid must be made with a per-
manent connection and equipped with a bipolar switch whose contacts have a
minimum opening of at least 3 mm, interposing fuses of max. 3A between the
boiler and the line. Make sure to respect the polarities (LINE: brown wire / NEU-
TRAL: blue wire / GROUND: yellow-green wire) in the connections to the elec-
tric line.
The unit's power cable must not be replaced by the user. If the cable gets dam-
aged, turn the unit off and have the cable replaced only by professionally qual-
ified personnel. In case of replacement, only use cable "HAR H05 VV-F"
3x0.75 mm2 with max. external diameter of 8 mm.
IMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE
CONTACTS. CONNECTING 230V TO THE ROOM THERMOSTAT TERMI-
NALS WILL PERMANENTLY DAMAGE THE PCB.
When connecting a time control or timer, do not take the power supply for such
devices from their cutoff contacts. Their power supply must be taken with a di-
rect connection from the mains or with batteries, depending on the type of de-
vice.
72
139
fig. 14 - Accessing the terminal block
155
138
10kOhm
1.8kOhm
A
1
2
3
4
5
6
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