CONTENTS
1 DESCRIPTION OF THE BOILER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 46
2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 47
3 CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 51
4 USE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 53
IMPORTANT
When carrying out commissioning of the boiler, you are highly recommended to perform the following checks:
– Make sure that there are no liquids or inflammable materials in the immediate vicinity of the boiler.
– Make sure that the electrical connections have been made correctly and that the earth wire is connected to a good
earthing system.
– Open the gas tap and check the soundness of the connections, including that of the burner.
– Make sure that the boiler is set for operation for the type of gas supplied.
– Check that the flue pipe for the outlet of the products of the combustion is unobstructed.
– Make sure that any shutoff valves are open.
– Make sure that the system is charged with water and is thoroughly vented.
–
Purge the system, bleeding off the air present in the gas pipe by operating the pressure relief valve on the gas
valve inlet.
INSTALLER INSTRUCTIONS
ENGLISH
46
1.1 INTRODUCTION
The “RMG Mk.II” are hot water gene-
rators designed for medium-sized heating plants. Are designed and built in
accordance with the european directives 90/396/CEE, 89/336/CEE,
73/23/CEE, 92/42/CEE and with
the european specification pr EN 656.
These appliances can be fired by natu-
ral gas (methane) and butane gas
(G30) or propane gas (G31). The
instructions given in this manual are
provided to ensure proper installation
and perfect operation of the appliance.
1 DESCRIPTION OF THE BOILER
1.2 DIMENSIONS
645 D
475
S
L
415
75
R
G
M
19 5
1000
65
485
665
Fig. 1
1.3 TECHNICAL FEATURES
RMG 70 Mk.II RMG 80 Mk.II RMG 90 Mk.II RMG 100 Mk.II
Heat output kW 49.1-70.1 56.0-78.7 63.0-90.0 69.9-98.6
Heat input kW 54.5-77.9 62.2-87.4 70.0-100.0 77.7-109.5
Sections n° 8 9 10 11
Power consumption W16161616
Maximum water head bar4444
Test pressure bar6666
Water content l 27303336
Category II
2H3+ II2H3+ II2H3+ II2H3+
Typ e B11BS B11 B S B11BS B11 B S
Smokes temperature °C 158 160 160 144
Smokes flow gr/s 49 52 63 81
Maximum temperature °C 95 95 95 95
C.H. setting range °C 40÷85 40÷85 40÷85 40÷85
Main burner nozzles
Quantity n° 7 8 9 10
Natural gas ø mm 2.95 2.95 2.95 2.95
G30 - G31 ø mm 1.70 1.70 1.70 1.70
Gas consumption *
Natural gas m
3
s/h 8.2 9.2 10.6 11.6
Butane (G30) kg/h 6.0 6.8 7.7 8.5
Propane (G31) kg/h 5.9 6.7 7.6 8.3
Burner gas pressure
Natural gas mbar 4.5 - 9.3 4.6 - 9.1 4.7 - 9.3 4.7 - 9.3
Butane (G30) mbar 12.2 - 25.2 12.3 - 25.4 12.0 - 25.1 12.5 - 25.1
Propane (G31) mbar 16.4 - 32.6 16.1 - 30.2 15.6 - 30.0 16.6 - 32.7
Gas supply pressure
Natural gas mbar 20 20 20 20
Butane (G30) mbar 29 29 29 29
Propane (G31) mbar 37 37 37 37
Weight kg 238 266 294 322
* The gas consumptions refer to the calorific value at s tandard conditions at 15°C - 1013 mbar.
R C.H. return 1
1
/
2
”
M C.H. flow 1
1
/
2
”
G Gas connection 1”
S Boiler/filling drain 3/4”
LD
mm ø mm
RMG 70 Mk.II 840 180
RMG 80 Mk.II 940 180
RMG 90 Mk.II 1040 200
RMG 100 Mk.II 1140 225
The boiler must be installed in a fixed
location 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
The “RMG Mk.II” boilers with a rating
of more than 35 kW must be equipped
with a technical room whose dimensions and requirements correspond to
the current safety standards. The minimum height of the boiler room must
comply with what is indicated in fig. 3 in
relation to the overall thermal capacity.
The minimum distance between the
walls of the room and the external
points of the boiler (right, left side,
rear) must not be 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 reached. 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
less than 3,000 cm
2
and 5,000 cm
2
for gas with a density greater than 0.8.
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1.4 MAIN COMPONENTS
Fig. 3
H in relation to the overall
thermal capacity:
– not greater than 116 kW:
2.00 m
– greater than 116 kW and less
than 350 kW: 2.30 m
– greater than 350 kW and less
580 kW: 2.60 m
– greater than 580 kW: 2.90 m
1
2
3
4
5
6
7
8
9
10
2 INSTALLATION
Fig. 2
KEY
1 Gas valve with coil assembly
2 1/2” bulb holder
3 Safety stat
4 Lock out reset button
5 Main switch
6 Regulation sta with double contact
7 Thermometer
8 Smoke stat
9 1/8” pressure test point
10 Burner manifold
2.1.1 Handling
Once the boiler is in its place of installation 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, lif t 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 operating 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 connections should be easy to disconnect
using pipe unions with orientable connections. 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 castiron 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 distributor, 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 purpose, you are recommended to use an
automatic system of precedence.
The gas connection must be made
using seamless steel pipe
(Mannesmann type), galvanized and
with threaded joints provided with
gaskets, excluding three-piece connections, except for initial and end
connections.
Where the piping has to
pass through walls, a suitable insula-
ting sleeve must be provided.
When sizing gas piping, from the
meter to the boiler, take into account
both the volume flow rates (consumption) in m
3
/h and the relative density of
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, limiting pressure loss
between the gas meter and any apparatus 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 technical data identifying the boiler and the
type of gas for which the boiler is
arranged.
2.3 CHARACTERISTICS
OF FEEDWATER
It is absolutely essential that the water
used for the central heating system
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 par tially or totally.
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 impurities 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-pressurization of the expansion vessel,
must correspond, or in any case must
not be less than, the height of the static column of the system (e.g., for a static column of 5 m, the pre-pressurization pressure of the expansion vessel
and the charging pressure must correspond to at least 0.5 bar).
2.5 CONNECTING UP FLUE
The flue for the atmospherical expulsion of the combustion products from
natural draught appliances must meet
48
Fig. 3/a
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