24
HF
CWI
G
HWO
HR
31
102
80
78
49
70
10
5
Fig. 1
6
In order to safeguard the heat exchanger
and circulation pump, especially in case of
boiler replacement, it is recommended that
the system is hot-
fl
ushed to remove any
impurities (especially oil and grease) from
the pipes and radiators.
Make sure that the domestic water and
central heating pipes are not used to earth
the electrical system. The pipes are totally
unsuitable for this purpose.
Isolation Valves must be installed on the
heating and D.H.W circuits. This will facili-
tate all maintenance and service operations
where the boiler needs to be drained.
4.5 Water Connections
■
To prevent vibration and noise coming from
■
The system, do not use pipes of reduced diam-
eter, short radius elbows or severe reductions in
the cross sections of the water passages.
Condensate Drain
The condensate drain
fl
exible pipe supplied with the boiler (conforming to UNI EN 677 standard) must be
connected to a proper condensate trap. The condensate discharge into the drainage system is allowed pro-
viding a condensate trap (siphon) is installed.
Any condensate discharge pipe work external to the building (or in an unheated part of it) must be insulated
to protect against frost. Before switching the boiler On, check the correct condensate discharge.
■
To facilitate the installation, the boiler is supplied with an hydraulic connection kit.
Domestic hot water circuit
■
In order to prevent scaling and eventual damage to the D.H.W heat exchanger, the mains water supply
must not have a hardness rating of more than 17.5 °French hardness value. It is nevertheless advisable to
check the properties of the water supply and install the appropriate treatment devices where necessary.
The cold water supply pressure at the inlet to the boiler must be between 0.5 and 6 bar.
In areas with higher water inlet pressure a pressure reducing valve must be
fi
tted before the boiler.
The frequency of the heat exchanger coil cleaning depends on the hardness of the mains water supply and
the presence of residual solids or impurities, which are often present in the case of a new installation. If the
characteristics of the mains water supply are such that require it to be treated, then the appropriate treatment
devices must be installed, while in the case of residues, an in-line
fi
lter should be suf
fi
cient.
All D.H.W. circuits, connections,
fi
ttings, etc. should be fully in accordance with relevant standards and water
supply regulations.
Central heating circuit
In order to prevent scaling or deposits in the primary heat exchanger, the mains supply water to the heating
circuit must be treated according to the requirements of local standards.
This treatment is indispensable in the case where the circuit is frequently topped-up or when the system is
often either partially or fully drained.
The outlet connection of the boiler safety valve must be connected to a discharge trap. The manufacturer
will not be held responsible for
fl
ooding caused by the operation of the safety valve in the case of system
overpressure.
