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9.11 Checking the gas supply
pressure
Check appliance for gas tightness.
Recheck operational pressures as de-
scribed in section "Checking the gas supply
pressure" to page 57 of this manual.
9.12 Water inhibitor concentration
Where chemical products are used the level
of water treatment should be checked on an
annual basis and re treated after full or par-
tial drain down.
A conductivitymeter can be used to check
the correct concentration of inhibitor in the
heating water.
9.13 Setting the boiler chimney
sweep function
With the boiler set in chimney sweep mode,
it is possible to exclude some boiler auto-
matic functions making check and control
operations easier.
• Enter in "programming mode" by pressing
keys 9 - 10 - 11 ( Fig. 9.10 ) for 10 seconds at
the same time until the letters Pr that al-
ternate with code 01 are displayed on the
LCD display, indicating that "parameter
01"( Fig. 9.11 ) has been activated.
9
Fig. 9.10
MAINTENANCE
Fig. 9.11
Chimney sweep function at minimum
output
• Press keys 10 and 11 ( Fig. 9.10 ) at the
same time until the LCD display displays
the letters LP that alternate with the heat-
ing water temperature value (e.g.45),
indicating the activation of the "chimney
sweep function" at minimum output ( Fig.
9.12 ).
Fig. 9.12
11
Chimney sweep function at maximum
output in heating mode
10
• Press key 11 to vary the output in chimney
sweep mode: when the LCD display dis-
plays the letters CP that alternate with the
heating water temperature value (e.g.99),
the "chimney sweep function" is at maxi-
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