34
3.2.7. Chimney sweep function
The boiler features a chimney sweep function that has to be used to measure in place the combustion efficiency and to access the sub-
sequent combustion adjusting phase.
To enable the chimney sweep function, hold for the cycle time the keys "
+
" (
A
+
B
If the keys are released before the cycle time lapses, the boiler continues to operate normally.
If the hot water supply for domestic use is being processed, the chimney sweep function is performed on the same line, otherwise on the
heating one.
After having accessed the chimney sweep function on the display shows alternatively the letters "
Lo
" and the heating water temperature
value (e.g. 45), indicating the “chimney sweep function" got enabled with
minimum power
. The display shows the symbol " " (
1
the burner is running. The boiler performs the start-up sequence and, subsequently, starts operating at minimum power ("").
Press and hold for 3 seconds the key “
” (
F
fig. 1) to go to the “chimney sweep function" at
maximum power
("
Hi
").
Hold for 3 seconds the key “
” (
E
fig. 1) to return to the “chimney sweep function" with
minimum power
("").
To exit the chimney sweep function press and hold for 3 seconds the key “
” (
B
fig. 1) and return to normal operation.
The chimney sweep function duration is 15 minutes.
3.2.8. Connection to the gas network
The gas supply pipe section must be equal or higher than one used for the boiler.
The pipe section depends on its length, type of path and gas flow rate. As a consequence, it has to be sized.
Follow the installation standards in force, herein integrally applied.
Be reminded that, prior to commissioning a gas distribution system, therefore before connecting it to the
counter, its sealing must be checked.
If system parts are hidden, the sealing test has to be performed prior to covering the piping.
The leaks test must not be performed with combustible gas: use air or nitrogen.
If gas is fed in the pipes, be remember that it is forbidden to search for leaks using flames; use for this pur-
pose suitable products available on the market.
To connect the gas connector of the boiler to the supply pipe IT IS MANDATORY to insert a STOP seal having
suitable size and made from the proper material(fig. 12).
DO NOT USE hemp, Teflon tape or similar materials for this type of fitting.
fig. 10
Alternative
position
Seal
code 008646010
fig. 11
fig. 12
Seal