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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
The combustion circuit is sealed with respect to the place of installation, therefore the
unit can be installed in any room. However, the place of installation must be sufficiently
ventilated to prevent the creation of dangerous conditions in case of even small gas
leaks. This safety standard is required by the EEC Directive no. 2009/142 for all gas
units, including those with sealed chamber
The unit is suitable for operation in a partially protected place in compliance with EN 297
pr A6, for temperatures to -5°C. It is advisable to install the boiler under the slope of a
roof, inside a balcony or in a sheltered recess.
Therefore the place of installation must be free of dust, flammable materials or objects
or corrosive gases.
The boiler is arranged for wall mounting and comes standard with a hooking bracket. Fix
the bracket to the wall according to the measurements given in the cover drawing and
hook the boiler on it. A metal template for marking the drilling points on the wall is avail-
able by request. The wall fixing must ensure stable and effective support for the gener-
ator.
If the unit is enclosed in a cabinet or mounted alongside, a space must be pro-
A
vided for removing the casing and for normal maintenance operations
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 making the connection, check that the unit is arranged for operation with
the type of fuel available and carefully clean all the system pipes.
Carry out the relevant connections according to the cover diagram and the symbols giv-
en on the unit.
Note: The unit has an internal bypass in the heating circuit.
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.
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.
3.4 Gas connection
The gas must be connected to the relevant union (see figure on cover) in conformity with
the current regulations, with a rigid metal pipe or with a continuous surface flexible s/steel
tube, installing a gas cock between the system and boiler. Make sure all the gas connec-
tions are tight.
3.5 Electrical connections
Important
B
The unit must be connected to an efficient earthing system in conformity with
current safety regulations. Have the efficiency and suitability of the earthing
system checked by professionally qualified personnel; the Manufacturer de-
clines any liability for damage caused by failure to earth 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 power supply must be per-
manent and equipped with a double-pole switch with contact opening distance
of at least 3 mm, installing fuses of max. 3A between the boiler and the line.
Make sure to respect the polarities (LINE: brown wire / NEUTRAL: blue wire /
EARTH: yellow/green wire) in connections to the electric line.
B
The unit's power cable must not be replaced by the user; if damaged, switch
the unit off and have the cable replaced by professionally qualified personnel.
If replacing the power cable, only use "HAR H05 VV-F" 3x0.75 mm2 cable with
max. ext. diameter of 8 mm.
Room thermostat (optional)
B
IMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE
CONTACTS. CONNECTING 230 V TO THE ROOM THERMOSTAT TERMI-
NALS WILL PERMANENTLY DAMAGE THE ELECTRONIC BOARD.
When connecting time controls or a timer, do not take the power supply for
these devices from their breaking contacts Their power supply must be by
means of direct connection from the mains or with batteries, depending on the
kind of device.
14
EN
Accessing the electrical terminal block
The electrical terminal block can be accessed after removing the casing. The layout of
the terminals for the various connections is also given in the wiring diagram in fig. 48.
3.6 Fume ducts
Important
The unit is a "C type" with sealed chamber and forced draught, the air inlet and fume out-
let must be connected to one of the following extraction/suction systems. The unit is ap-
proved for operation with all the Cny flue configurations given on the dataplate. Some
configurations may be expressly limited or not permitted by law, standards or local reg-
ulations. Before installation, check and carefully follow the instructions. Also, comply with
the instructions on the positioning of wall and/or roof terminals and the minimum distanc-
), use suitably treated
es from windows, walls, ventilation openings, etc.
3
Baffles
Boiler operation requires fitting the baffles supplied with the unit. Check that the boiler
has right baffle (if to be used) and its correct positioning.
A
1
2
Connection with coaxial pipes
fig. 9 - Examples of connection with coaxial pipes (
Table. 2 - Typology
Type
C1X
C3X
cod. 3541D120 - Rev. 00 - 10/2012
CLIZIA D LOW NOX 24 AS
72
139
fig. 8 - Accessing the terminal block
B
3
2
1
A Baffle replacement with boiler not installed
B Baffle replacement with boiler and fume ducts already installed
Description
Wall horizontal exhaust and inlet
Roof vertical exhaust and inlet
138
3
4
3
5
6
4
= Air /
= Fumes)
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