22
2.1
BOILER ROOM
The boiler room should feature all the
characteristics required by standards
governing liquid fuel heating systems.
2.2
BOILER ROOM DIMENSIONS
Position the boiler body on the founda-
tion bed, which should be at least 10
cm high. The body should rest on a sur-
face allowing shifting, possibly by
means of sheet metal. Leave a clear-
ance between the boiler and the wall of
at least 0.60 m, and between the top
of the casing and the ceiling of 1 m
(0.50 m in the case of boilers with
incorporated D.H.W. tank). The ceiling
height of the boiler room should be less
than 2.5 m.
2.3
CONNECTING UP SYSTEM
When connecting up the water supply
to the boiler, make sure that the speci-
fications given in fig. 1 are observed. All
connecting unions should be easy to
disconnect by means of tightening
rings. A closed expansion tank system
must be used.
2.3.1
“ARB” accessories
To ensure boiler efficiency, fit an auto-
matic air bleed valve (3 fig. 2) to the
3/8” sleeve of the heat delivery tube,
and a pressure relief valve set to 3 bar
(4 fig. 2) to the 1/2” sleeve. Install a
pressure relief valve calibrated to 7 bar
(9 fig. 2) on the boiler water infeed pipe
to prevent the risk of bursting due to
excess pressure build up. If the boiler
safety valve cuts in frequently, install a
5-litre expansion vessel (8 fig. 2) with
maximum operating pressure of 8 bar
on the hot water circuit. The tank
should be fitted with a natural rubber
food-grade diaphragm. The central
heating circuit pump can be installed at
the rear of the boiler in place of the
connection union (14 fig. 2).
2.3.2 Filling the water system
Before connecting the boiler, thor-
oughly flush the system to eliminate
scale which could damage the appli-
ance.
Filling must be done slowly so as to
allow any air bubbles to be bled off
through the air valves.
In closed-circuit heating systems, the
cold water filling pressure and the pre-
charging pressure of the expansion
vessel should be no less than or equal
to the height of the water head of the
installation (e.g. for water head of 5
meters, the vessel pre-charging pres-
sure and installation filling pressure
should be at least 0.5 bar).
2.3.3 D.H.W. production “ARB”
During the preparation of hot water,
the circulating pump installed on the
boiler circuit remains in operation until
the boiler thermostat probe detects
the pre-selected value.
1.5
COMBUSTION CHAMBER
DIMENSIONS
The combustion chamber is of the
straight flow type and complies with
standard pr EN 303-3 appendix E.
The dimensions are reported in fig. 3.
The refractory brick is supplied on all
“AR”
and
“ARB”
series boilers.
1.5.1 Burner assembly
The boiler is supplied to be assembled
on the burner.
The connection flange dimensions are
indicated in fig. 4.
The burners must be regulated
such that the CO
2
value is that indi-
cated in point 1.3, with a tolerance
of ± 5%.
2
INSTALACION
Fig. 3
L
Volume
mm
m
3
AR3
277
0,013109
AR4 - ARB4
377
0,019028
AR5 - ARB5
477
0,024947
Fig. 4
