105
4.5
CONVERSION
TO ANOTHER GAS
For the functioning with propane gas (G31), a
kit with what is needed for the conversion is
supplied.
To convert from one gas to another follow
the instructions below (fig. 17):
–Close the gas tap
– Replace the main nozzles (6) supplied in kit,
the aluminium washer ø 10 (5); to carry
out this operation use a ø 12 wrench.
–Remove the supply fitting of the pilot bur-
ner and substitute the nozzle (2).
–Insert the “GPL-MET” bridge of the con-
nector of the electronic panel onto the
“GPL” position (7 fig. 10).
– For the setting of the values of the
maximum gas pressure and the mini-
mum follow the indications as specified
in point 4.3.
Once the operating pressure changes
have been carried out seal the regula-
tors.
–The supply pressure mus t never be
greater than 50 mbar.
–Once the operations have been finished
apply the label with gas pre-settings sup-
plied with the kit to the shell panel.
NOTE: After the assembly the sealing
capacity of all the gas connections must
be tested, using soapy water and special
products, and avoiding the use of naked
flames. The conversion must be carried
out only by authorised personnel.
4.6
DISASSEMBLY OF
EXPANSION VESSEL
Before disassembly the expansion vessel,
empty the boiler of water. After the assem-
bly ensure that the expansion vessel is pre-
filled to a pressure of 1 bar.
4.7
CLEANING AND MAINTENANCE
Carry out the cleaning of the generator in
the following way (fig. 18):
–Remove the electricity supply to the boi-
ler and close the gas supply tap.
–Dismantle the gas group completely.
–Dismantle the lid; clean the interstices of
the boiler structure, going from the top
to the bottom with an adequate brush.
– In cleaning the burners chemical products
or steel brushes must never be used.
Make sure that the top perforated part of
the burners is free of encrustations.
–During the assembly and disassembly of
t he bur ner it is r ecommended t hat
attention be paid to the star ting and
detection electrodes. Reassemble the
parts removed from the boiler, observing
the succession of the phases.
–Check the chimney making sure that the
smoke stack is clean.
–Check the functioning of the main burner.
–After the assembly all the gas connec-
25
20
15
10
10.000
15.000
20.000
POTENZA TERMICA kcal/h
PRESSIONE UGELLO mbar
30
35
5
25.000
30.000
22
32
15
14
13
12
11
10
9
8
7
6
5
10.000
15.000
20.000
POTENZA TERMICA kcal/h
PRESSIONE UGELLO mbar
25.000
30.000
22
32
Fig. 16
Diagram pressure/heat output for natural gas (methane)
Diagram pressure/heat output for propane gas (G31)
Fig. 16/a
Funzionamento corretto
Bruciatore
Funzionamento anomalo
7
1
2
3
4
5
6
Pretranci
da staccare
7
Fig. 17
NOZZLE PRESSURE (mbar)
NOZZLE PRESSURE (mbar)
HEAT OUTPUT kW (kcal/h)
HEAT OUTPUT kW (kcal/h)
KEY
1
Pilot burner
2
Pilot nozzle
3
Pilot supply tube
4
Burner collector
5
Aluminium washer ø 10
6
Main nozzle
7
Combustion chamber front panel
Correct operation
Anomalous operation
Burner
