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Nonetheless in case of soft water and in
regions characterised by aggressive or acidic
water, the latter must be neutralised by means
of an appropriate treatment. Failure to observe
this rule shall void the warranty (see "Water
quality" chapter).
Monthly operations
• Verify the effi cient operation of the
safety valve by moving the lever that lifts
the safety shutter to eliminate impurities
between the housing and the shutter,
and ensure that the water expands
naturally when re-activating the heating
mode. When the appliance resumes
operation, a slight discharge may occur.
• Flush the appliance a few times through
the drainage valve in order to eliminate
slime deposited on the bottom of the
tank.
Descaling
• In regions characterised by hard water,
the inside of the tank must be checked
frequently to eliminate any scale
deposits with the aid of a water jet.
If the tank is heavily encrusted, a
chemical descaling procedure must
be eff ected. This is a very delicate
operation and must be carried out by a
specialised company.
4.2 INTERVENTION ON THE BURNER
- Close the gas shut-off valve (B Fig. 1.11).
- remove the burner cap secured by two screws
(without removing the latter).
- Disconnect the three fi ttings on the gas valve (A
B C Fig. 1.8) and the piezo igniter cables.
- Remove the two fi xing screws of the main
burner.
- Extract the main burner horizontally.
- Verify the condition of the ramps (gas outlet
holes).
- Inspect the pilot burner and the condition of the
spark plug.
- Clean the ends of the thermocouple.
- Re-mount the main burner unit by repeating the
dismantling operations in reverse order.
- Verify the effi cient operation of the piezo
igniter and make sure that a fl ame is generated
between the top of the pilot fl ame and the end
of the spark plug.
- Secure the burner into its housing.
- Check the tightness of the gas circuit (open the
gas valve B Fig. 1.11).
- Check the effi cient operation of the pilot fl ame
after the start-up procedure.
- Put the burner cap back into place.
4.3 INTERVENTION ON THE FUME
PIPES
- Clean the inside of the fl ue.
- Clean the inside of the fume hood.
- Clean the smoke defl ectors and reposition
them properly inside the fume pipes.
IMPORTANT NOTE.
Before putting any sealing component
back into place, make sure that the fi ttings
are in good condition and replace them if
necessary.
4.4. FUME PROTECTION DEVICE (FOR
CONTROLLING EXPULSION OF
COMBUSTION BY-PRODUCTS)
1 - Description of the draught anomaly detection
system (DAT), an inertia-based thermostatic
device connected in series on the thermocouple
circuit.
When there is an excessive amount of
combustion by-products in the fume hood, this
device shuts down the main and pilot burners
entirely. The burner can be restarted after a
delay of at least 15 minutes, corresponding
to the inertia of the thermostatic device (see
"Ignition" chapter). Obviously this must be done
after having eliminated the cause behind the
anomaly.
2 - Instructions for mounting the fume hood: The
fume protection device (FP) is secured to the
body of the fume hood. Inspect the latter to
ensure that it has been properly mounted and
connected electrically with the connection
cable emerging from the shell cover.
In the event of undue shutdowns, contact our
installer or Ariston Thermo authorised technical
assistance service for products under warranty.
GB
47
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