8
OPTIMAX HE PLUS S
Cod. 3540R543 - 08/2012 (Rev. 00)
2.2 Place of installation
The combustion circuit is sealed with respect to the place
of installation and therefore the unit can be installed in any
room. However, the place of installation must be suf
fi
ciently
ventilated to prevent the creation of dangerous conditions
in case of even slight gas leaks. This safety regulation is
provided for by EEC Directive no. 2009/142 for all gas units,
including those with a sealed chamber.
In any case, the place of installation must be free of dust,
fl
ammable materials or objects or corrosive gases.
The boiler is arranged for wall mounting and comes stan-
dard with a hanging bracket. A paper template for marking
the drilling points on the wall is provided in the box. The
wall
fi
xing must ensure stable and effective support for the
generator.
B
B
C
E
D
fi
g. 9 - Minimum distances around the boiler
If the unit is enclosed in a cabinet or mounted
alongside, a space must be provided for removing
the casing and for normal maintenance operations.
The minimum measurements to be respected are
given in
fi
g. 9.
A
Min. 2,5 cm
B
Min. 20 cm
C
Min. 30 cm
D
Min. 35 cm (via an openable panel)
2.3 Plumbing connections
Important
The heating capacity of the boiler must be previously established by calculating the building’s heat requirement according
to the current regulations. To ensure proper operation and long boiler life, the plumbing system must be adequately sized
and complete with all the necessary accessories, including a room thermostat, a thermostatic radiator valve (TRV), etc.
The system
fl
ow and return pipes must have a diameter of at least 22 mm for the
fi
rst 3 m of length from the unit.
If the system delivery and return pipes follow a path where air pockets could form in certain places, it is advisable to
install vent valves at these points. Also, install type “A” drain cocks at the lowest points in the system to allow complete
emptying.
The temperature drop between the delivery manifold and the return to the boiler should not exceed 20 °C.
A
fl
ow rate of at least 6 litres/min through the heat exchanger is required. An automatic bypass installed in the boiler
guarantees maintaining of the required
fl
ow rate.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully
fl
ush all the heating system pipes to remove any residuals or impurities that could affect
proper operation of the unit (as required by BS 7593 Building regs Doc L).
Carry out the connections to the unit as indicated in
fi
g. 29.
The safety valve discharge must be connected to a 15 mm diameter copper pipe descending from the boiler to
run off system water in case of overpressure in the heating circuit. Otherwise, the boiler manufacturer cannot
be held liable if the discharge valve operates and
fl
oods the room. The discharge must be run to the outside of
the building to prevent the risk of damage or injury caused by discharged hot water in case of overpressure in
the system.
Connections to the boiler are to be made in such a way as to ensure that its internal pipes and
fi
ttings are free of stress.
If a non-return valve is installed also on the DHW circuit (if provided for), it is necessary to install a safety valve between
the boiler and circuit (with non-return valve at least 3 metres from the boiler) or an expansion tank for domestic use.
