E25 / E29
4
EN
cod. 3541M540 - Rev. 01 - 06/2017
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. However, the place of installa-
tion must be sufficiently ventilated to prevent the creation of dangerous condi-
tions 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, flammable materials or objects or
corrosive gases.
The boiler is arranged for wall mounting and comes standard with a hanging bracket. A
paper template for marking the drilling points on the wall is provided in the box. The wall
fixing must ensure stable and effective support for the boiler.
A
If the unit is enclosed in a cabinet or mounted alongside, a space must be provided for remov-
ing the casing and for normal maintenance operations. The minimum measurements to be
respected are given in fig. 8.
fig. 8 - Minimum distances around the boiler
A
Min. 2,5 cm
B
Min. 20 cm
C
Min. 30 cm
D
Min. 60 cm (via an openable panel)
3.3 Plumbing connections
Important
The heating capacity of the unit must be previously established by calculating the build-
ing'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 thermostattable valve (TRV)
etc. The system delivery and return pipes must have a diameter of at least 22 mm for the
first 3 m of length from the unit.
If the system delivery and return pipes follow a path where air pockets can form in certain
places, it is advisable to install vent valves at these points. Also, type "A" drain cocks
must be installed at the lowest points in the system to allow complete emptying.
B
An automatic bypass with flow rate of at least 6 l/min. must be installed (con-
nected as far away as possible from the boiler) if radiators with thermostatic
valves have been connected.
fig. 9 - Automatic bypass connection
The temperature drop between the delivery manifold and the return to the boiler should
not exceed 20°C.
B
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the heating system to remove any re-
siduals 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 fig. 34.
B
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 floods 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 fittings 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.
D
A
A
B
C
0
1
2
3
4
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
Cold water mains