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MAINTENANCE
Maintenance is an essential part of the safe and efcient
operation of the appliance and ensures its durability. It
should be performed according to the instructions given in
current legislation. Perform combustion analysis regularly
in order to check the operating efciency of the appliance
and to make sure any polluting substances relased are
within the boudaries set by current legislation.
Before beginning maintenance work:
- Disconnect the appliance from the electricity supply
by turning the external bipolar switch to the “OFF”
position;
- Close the gas valve and the central heating and
domestic hot water system valve.
After the work has been completed the initial settings will
be restored.
General comments
It is recommended that the following inspections be
carried out on the appliance at least once a year:
1. Check the seals in the water part and, if necessary,
replace the gaskets and restore the seal to perfect
working order.
2. Check the seals in the gas part and, if necessary,
replace the gaskets and restore the seal to perfect
working order.
3. Visually check the overall condition of the appliance.
4. Visually check the combustion and, if necessary,
disassemble and clean the burner.
5. Following the inspection detailed in point “3”,
disassemble and clean the combustion chamber, if
necessary.
6. Following the inspection detailed in point “4”,
disassemble and clean the burner and injector, if
necessary.
7. Cleaning the primary heat exchanger
8. Make sure the following safety devices are operating
correctly:
- temperature limit safety device.
9. Make sure that the following gas part safety devices
are operating correctly:
- absence of gas or ame safety device (ionisation).
10. Checking the efciency of domestic hot water
production (ow rate and temperature).
11. Cleaning the lter in cold water inlet.
WARNING! THE APPLIANCE MUST NOT
BE PUT IN FUNCTION WITHOUT FILTER.
12. Perform a general inspection of the aplliance
operation.
13. Remove oxide from the detection electrode using an
emery cloth.
Operational test
After having carried out the maintenance operations, ll
the appliance and the water circuit.
- Begin operating the boiler.
- Check the settings and make sure all the command,
adjustment and monitoring parts are working correctly.
- Check the seal and that the system for the expulsion of
fumes/suction of comburent air is operating correctly.
Draining procedures
The system must be drained using the following procedure:
- Close the inlet water valve;
- Open the hot and cold water taps;
- Empty the water from the lowest points of the system
(where applicable).
WARNING
Before handling, empty all components which may contain
hot water, performing bleeding where necessary.
Descale the components in accordance with the
instructions provided on the safety data leaet supplied
with the product used, make sure the room is well
ventilated, wear protective clothing, avoid mixing different
products, and protect the appliance and surrounding
objects.
Seal all openings used to take a gas pressure reading or
to make any gas adjustments.
Make sure that the nozzle is compatible with the supplied
gas.
If a smell of burning is detected or smoke is seen leaking
from the appliance, or there is a smell of gas, disconnect
it from the electricity supply, shut off the gas valve, open
the windows and call for technical assistance.
Information for the user
Inform the user on how to operate the appliance.
In particular, provide the user with the instruction manuals
and inform him/her that these must be stored with the
appliance.
Moreover, make sure the user is aware of the following:
- How to set the temperature and adjustment devices
for using the appliance correctly and in a more cost-
efcient way.
- The system must be serviced regularly in compliance
with legislation.
- The settings relating to the supply of combustion air and
combustion gas must not in any event be modied.
24

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