34
5 MAINTENANCE
Periodic maintenance is required by law, and is essential
for ensuring the appliance's safety, efficiency, non-lasting
functionality. It helps to reduce consumption, decrease
pollutant emissions, and maintain the product reliable over
time.
Perform the following operations before beginning any
maintenance:
- Switch the electricity supply OFF at the mains power
switch and turn the control panel function selector to
(OFF)
Fig. 43
- Close all external fuel shut-off cocks.
Fig. 44
The external panels and control panel must be cleaned us-
ing cloths moistened with soap and water.
To remove stubborn marks, use a cloth damped in a 50%
mix of water and denatured alcohol or a suitable cleaning
product.
Carefully dry after cleaning.
a
Do not use abrasive products, petrol or triethylene.
5 1 Routine maintenance
This normally means the following tasks:
- removing any oxidation from the burner
- removing any scale from the heat exchangers;
- removing any residues from the condensate drainage
pipe;
- checking and cleaning the drainage pipes;
- checking the external appearance of the boiler
- checking the ignition, switch-off and operation of the
appliance, in both domestic water mode and heating
mode
- checking the seal on the gas and water couplings
and pipes
- checking the gas consumption at maximum and min-
imum output;
- checking the position of the ignition-flame detection
glowplug
- checking the gas failure safety device.
5 2 Extraordinary maintenance
These tasks restore appliance operation in accordance
with the design and regulations - e.g. following the repair of
an accidental fault.
This normally means:
- replacement
- repair
- overhaul of components.
These tasks require special means, equipment and tools.
During the initial installation phase, or in the event of ex-
traordinary maintenance, it is recommended to discharge
the air from the heating circuit and the boiler, see section
Eliminating the air from the heating circuit and boiler
5 3 Checking the combustion
parameters
To carry out the combustion analysis, proceed as follows:
- insert the analyser's probes into the flue gas (A) and
air (B) inlets on the boiler, after having removed caps
(C) and (D).
A
B
C
D
Fig. 45
b
The flue gas analysis probe should be inserted until
its reaches the stop.
- Tighten the analyser's sealing screw in the flue gas
analysis inlet hole
- Calibrate the boiler as described in the section "Ad-
- Remove the probes from the analyser, and reapply
the previously removed caps.
b
Even during the combustion analysis phase, the
function that switches the boiler off when the water
temperature reaches the maximum limit (about 90°C)
remains enabled.
