Sime RMG Mk.II Serie Instrucciones Para El Instalador página 52

2. 1 . 1 Handling
Once the boiler is in its place of instal-
lation and the packaging has been
removed, proceed as follows if it must
be moved (fig. 3/a):
– remove the casing cover;
– attach the lifting brackets (located
on the rear of the boiler) and fasten
it in place with the screws provided;
– insert two 3/4" pipes in the holes in
the brackets, lift the boiler carefully
and place into position.
2.2 CONNECTING UP SYSTEM
Before proceeding to connect up the
boiler, you are recommended to make
the water circulating in the piping in
order to eliminate any foreign bodies
that might be detrimental to the ope-
rating efficiency of the appliance.
The unit must be connected up with
rigid pipe fittings which will not subject
it to stress of any kind. The connec-
tions should be easy to disconnect
using pipe unions with orientable con-
nections. You are recommended to
install suitable shutoff valves on the
system flow and return pipes.
CAUTION: In order to achieve a good
water distribution inside the cast-
iron body, the system flow and return
pipes should be connected to the
same side of the boiler. The boiler
comes supplied standard with the
attachments on the right-hand side,
with the possibility of them being
transferred to the left-hand side. In
that case, move the water distribu-
tor, located on the return header, and
the thermostat bulbs located in the
sheathe, to the same side.
The thermal jump between the system
flow and return pipes should not exceed
20°C. For this purpose, it is advisable to
install a mixer valve with corresponding
anti-condensation pump.
CAUTION: The system circulation
pump or pumps must go into action at
the time of boiler ignition. For this pur-
pose, you are recommended to use an
automatic system of precedence.
The gas connection must be made
using seamless
(Mannesmann type), galvanized and
with threaded joints provided with
gaskets, excluding three-piece con-
nections, except for initial and end
connections. Where the piping has to
pass through walls, a suitable insula-
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ting sleeve must be provided.
When sizing gas piping, from the
meter to the boiler, take into account
both the volume flow rates (consump-
tion) in m
the gas in question. The sections of the
piping making up the system must be
such as to guarantee a supply of gas
sufficient to cover the maximum
demand,
between the gas meter and any appa-
ratus being used to not greater than:
– 1.0 mbar for family II gases (natu-
ral gas);
– 2.0 mbar for family III gases (butane
or propane).
An adhesive data plate is sticked inside
the front panel; it contains all the tech-
nical data identifying the boiler and the
type of gas for which the boiler is
arranged.
2.3
It is absolutely essential that the water
used for the central heating system
steel pipe should be treated in the following cases:
– Very extensive systems (with high
contents of feedwater).
– Frequent addition of makeup water
into the system.
– Should it be necessary to empty the
system either partially or totally.
3 /h and the relative density of
limiting pressure loss
CHARACTERISTICS
OF FEEDWATER
2.3. 1 Filter on the gas pipe
The gas valve is supplied ex factory
with an inlet filter, which, however, is
not adequate to entrap all the impuri-
ties in the gas or in gas main pipes.
To prevent malfunctioning of the valve,
or in certain cases even to cut out the
safety device with which the valve is
equipped, install an adequate filter on
the gas pipe.
2.4 SYSTEM FILLING
Filling must be done slowly so as to
allow any air bubbles to be bled off
through the air vents provided on the
heating system.
The pressure of cold charging of the
system, and the pressure of pre-pres-
surization of the expansion vessel,
must correspond, or in any case must
not be less than, the height of the sta-
tic column of the system (e.g., for a sta-
tic column of 5 m, the pre-pressuriza-
tion pressure of the expansion vessel
and the charging pressure must cor-
respond to at least 0.5 bar).
2.5 CONNECTING UP FLUE
The flue for the atmospherical expul-
sion of the combustion products from
natural draught appliances must meet
Fig. 3/a