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2
INSTALLATION
The boiler must be installed in a fixed loca-
tion and only by specialized and qualified
firms in compliance with all instructions
contained in this manual.
Furthermore, the installation must be in
accordance with current standards and
regulations.
2.1
BOILER ROOM AND VENTILATION
Boilers must only be installed in boiler rooms
and FULLY protected environments; installa-
tion in places such as porches or partially pro-
tected environments is not permitted.
The "RS Mk II" boilers with a rating of more than
35 kW must be equipped with a technical room
whose dimensions and requirements corre-
spond to the current safety standards.
The minimum height of the boiler room must
comply with what is indicated in fig. 3 in rela-
tion to the overall thermal capacity.
The minimum distance between the walls of
the room and the outer points on the boiler
(right and left sides and rear) must be no
less than 0.60 m.
It is possible to place a number of apparatus
next to each other, on condition that all the
safety and control devices can be easily rea-
ched. In addition, to circulate air in the room,
air vents must be made on the outside walls
for which the surface area must never be
2
less than 3,000 cm
and 5,000 cm
with a density greater than 0.8.
The distance between the boiler and any
fuels stored in the area must be sufficient
to prevent the fuels from reaching a hazar-
dous temperature, and in no case less than
4 metres.
2.2
CONNECTION WITH HEATING SYSTEM
Connections with the heating system should
be easy to disconnect, made with rotating
pipe unions. It is always advisable to as-
semble suitable gate valves on the heating
system delivery and return pipes.
WARNING:
In order to ensure proper distribution of
water in the cast iron body, the heating
system delivery and return pipes must be
connected to the same side of the boiler.
The boiler is supplied with connections on
the right side, though they may be moved
to the left side by moving the flanges and
their collars and the corresponding water
distributor.
It is advisable to ensure that the tempera-
ture difference between the heating system
delivery and return pipes does not exceed
20°C; installation of a mixer valve with an
anti-condensation pump is advisable for this
purpose.
WARNING:
The heating system's circulation pump(s)
must be turned on when the boiler is on.
An automatic precedence system is recom-
48
mended for this purpose.
The gas connection must be made with
seamless galvanised steel pipes (such as
Mannesmann pipes), with threaded, sealed
joints, excluding three-piece unions except
for the start and end connections.
Pipes must pass through walls in a sealed
sheath. In determining the size of the gas
pipe from the meter to the boiler, take into
account both rate of flow in volume (con-
sumption) in m3/c and the density of the gas
2
for gas
in question.
The section of pipes in the heating system must
be sufficient to ensure that the gas supply fulfils
maximum demand, limiting pressure drop from
the meter to any utility to no more than:
– 1,0 mbar in the case of gases in the second
family (methane gas)
– 2,0 mbar in the case of gases in the third
family (G30-G31).
On the inside of the skirt is an adhesive plate
bearing technical data identifying the boiler
and the type of gas which it is set up to burn.
2.2.1
Filter on gas pipe
To prevent poor valve functioning or, in some
cases, exclusion of the safety devices provi-
ded, assemble an adequate filter on the gas
pipe inlet.
2.3
CHARACTERISTICS
OF WATER SUPPLY
The water used to supply the heating circuit
should must be treated in accordance with
UNI-CTI 8065 standards.
It is absolutely essential that the water is to
be treated in the following cases:
– Very large heating systems (with large
water content)
– Frequent topping up of water in the sy-
stem
– When the system must be partially or to-
tally emptied.
H on the basis of total thermal capacity:
– no more than 116 kW: 2.00 m
– from 116 to 350 kW: 2.30 m
– from 350 to 580 kW: 2.60 m
2.4
It is a good idea to circulate water in the pi-
pes before connecting up the boiler in order
to eliminate any foreign matter which could
affect boiler functioning.
Fill the heating system slowly to permit air
bubbles to come out through the outlets on
the heating system.
The pressure at which the heating system is
filled with cold water and the pre-inflation
pressure of the expansion tank must cor-
respond to, and in no case be less than, the
height of the static column on the heating
system (for example, in the case of a static
column of 5 metres, tank pre-filling pressu-
re and filling pressure must at least corre-
spond to a minimum of 0.5 bar).
2.5
The flue for evacuation of the products of
combustion of natural draught boilers into
the atmosphere must meet the following re-
quirements:
– sealed against products of combustion,
waterproof and heat insulated;
– made of materials which can resist nor-
mal mechanical stress, heat and the ac-
tion of products of combustion and con-
densation produced by them over time;
– vertically oriented and free of choking
throughout its length;
– adequately insulated to prevent conden-
sation or cooling of flue gases, especially
if located outside the building or in unhea-
ted premises;
– separated from combustible or highly
flammable materials by an air space or
appropriate insulation;
– provided with a chamber at least 500 mm
high for collection of solid materials and
condensation underneath the entrance to
the first channel.
This chamber must be accessible through
an opening with a metal door which does
not let air in;
– circular, square or rectangular internal
section; if square or rectangular, corners
Fig. 3
FILLING THE HEATING SYSTEM
FLUE
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