Maintenance Instructions; Maintenance Regulations; Cleaning The Outer Parts; Safety Valves - Viessmann VITOWELL comfort Installation And Operation Manual

Maintenance instructions

Maintenance regulations (for professional installers)
Warning! Follow the general warnings and the safety norms listed at the beginning
of the text and keep to all the instructions given under all circumstances.
All maintenance operations and service visits should be performed by a professional installer (who has the
skills required by the applicable norms in force).
Disconnect the appliance from the electricity supply before carrying out any work on it.

Cleaning the outer parts

■ Prevent the water from flowing into the water heater during the cleaning process.
■ Use a soft cloth soaked in warm water or mild detergent (detergents containing acids, chemical solvents or
abrasive agents are forbidden).
Safety valve
If the safety valve is equipped with valve lever, lift the valve lever, under any of following conditions:
■ Empty the appliance if necessary;
■ Check if the valve works normally regularly (typically every month);
■ Before removing the valve, it is important to check that the water heater has been switched off long enough
for the water inside to cool down. Flush the valve with water to remove any deposit of salts. The valve can be
removed and reattached by use of a wrench.
Periodical maintenance (for professional installers)
■ To ensure the best performance from this appliance, descale the heating element once every two years.
■ If you prefer not to use special descaling acids for this operation, simply crumble away the lime deposit
without damaging the heating element.
■ Replace the magnesium anode every two years. (The replacement cycle may vary depending on the water
quality).
■ According to the local water quality and user behaviors, descale the tank regularly (typically every month).
Cleaning of heating tube and replacement of magnesium anode vary with the water quality. Normally, the
frequency increases with the water hardness. It must be operated by professionals.
This water heater is manufactured to suit the water conditions of
most public reticulated water supplies. The content of dissolved
solids (TDS) in water ranged from 100 mg/L to 600 mg/L. However,
there are some known water chemistries which can have
detrimental effects on the water heater and its operation and / or
life expectancy. If you are unsure of your water chemistry, you
may be able to obtain information from your local water supply
authority.
If the TDS content in water is more than 600 mg/L or softening
water is used, the consumption of magnesium anode may be
faster. Please shorten the inspection interval period of magnesium
anode and replace the consumed magnesium anode in time.
Troubleshooting
Do not attempt to service this appliance on your own. Please contact your competent service technicians.
Before calling your Technical Servicing Centre, check that the fault is not due to lack of water or power
failure.
In case of abnormal water heating, a thermic safety switch, according to the CEI-EN regulations, breaks the
circuit in both feeding phases to the heating element. In this case it is better to call the Technical Assistance.
The buzzer will send an alarm when there is any fault. The alarm will reset after the fault is cleared (D1 type).
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