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.
2.2.1
D.H.W. tank unit “BT130 - BT150”
The
“22 OF - 32 OF”
versions can be mat-
ched to the separate D.H.W. tank units
“BT130-BT150”
.
The D.H.W. tank units can be installed
underneath the boiler (
“BT150”
) or on the
side (“BT130”). The D.H.W. sensor (SB) is
supplied with the tank.
The SB must be connected to the electro-
nic control panel of the boiler as shown in
fig. 6. To aid installation an optional hydrau-
l i c c o n n e c t i o n k i t i s a v a i l a b l e , c o d e
8076104 (
“BT130”
) and code 8076105
(
“BT150”
). Detailed instructions on assem-
bling the kit are given in the packaging.
2.2.2
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 equip-
ped, install an adequate filter on the gas pipe.
2.3
CHARACTERISTICS
OF FEEDWATER
To prevent lime scale and damage to the
tap water exchanger, the water supplied
should have a hardness of no more than
20°F. In all cases the water used should be
tested and adequate treatment devices
should be installed. To prevent lime scale or
deposits on the primary exchanger, 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 extensive system (with high con-
tents of feedwater).
–Frequent addition of makeup water into
the system.
–Should it be necessary to empty the
system either partially or totally.
2.4
SYSTEM FILLING
(fig. 4)
The filling is carried out at a boiler tempera-
ture no less than 40°C. It is done slowly in
order to allow the air bubbles to be relea-
sed through appropriate vents. In order to
facilitate this operation position the set
screw slot of the non return valves horizon-
tally. Once the filling is completed put the
screws back in the starting position. The
loading pressure of the un-started plant
should be 1 bar.
Once the filling has been
completed, close the filling tap.
2.4.1
Emptying the plant
To carr y out t his operation act on t he
discharge tap (4 fig. 3 - 8 fig. 3/a - 10 fig.
3/b). Before carrying out this operation
check that the filling tap is closed.
2.5
FLUE
The flue for the atmospherical expulsion of
the combustion products from natural
draught appliances must meet the following
requirements:
–Be gas-tight to the combustion products,
waterproof and thermally insulated.
–Be built of materials suitable for keep
resisting to normal mechanical stresses,
heat, and the action of combustion pro-
ducts and their possible condensates.
– Follow a vertical path and not present
any throttling throughout its entire
length.
–Be adequately insulated to prevent phe-
nomena of condensation or smokes coo-
ling, in particular if located outside the
building or in unheated ambiences.
–Be set at an adequate distance from
combustible or easily inflammable mate-
rial by means of an air gap or suitable
insulating material.
–Have beneath the mouth of the first
smoke duct a chamber for collecting
solid material and any condensate; the
height of the chamber must be at least
500 mm.
Access to the chamber must be guaran-
teed by means of an opening provided
with an air-tight metal door.
–Have a circular, square, or rectangular
internal cross section; in the case of
square or rectangular sections, the cor-
ners must be rounded off with a radius
o f n o t l e s s t h a n 2 0 m m . H o w e v e r,
hydraulically equivalent cross sections
are allowed.
–Be equipped with a chimney-pot at the
top, which must be outside the so-called
back-flow zone, so as to prevent the for-
mation of back-flow, which prevents free
discharge of the products of combustion
into the atmosphere.
–Be devoid of mechanical means of suc-
tion located at the top of the pipe.
–No overpressure should be present in a
chimney that passes within or close up
to inhabited rooms.
2.5.1
Connecting up flue
Fig. 5 refers to the connection of the boilers
to the flue or chimney through smoke ducts
for apparatus of nominal heat input not grea-
ter than 35 kW.
When making the connection, in addition to
respecting the dimensions given, you are
recommended to use gas-tight materials
capable of resisting over time mechanical
stresses and the smokes heat.
At any point along the smoke duct, the tem-
perature of the combustion products must
be higher than the dew point.
More than a total of three changes of direc-
tion must not be made, including the inlet
connection to the chimney/flue. For any
changes of direction use only curved pipe
lengths.In case of having to go through com-
bustible walls, insulation of the section is
necessary; the insulation must be at least
5cm thick.
95
APRE
1
2
Fig. 4
KEY
1 Filling cock
2 Non return valve
OPEN
Fig. 5
