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7. maintenance
Important
Maintenance is an essential part of the safe and effi cient
operation of the boiler 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 effi ciency of the boiler and to make sure
any polluting substances released are within the boundaries
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 isolation valve and the central heating and
domestic hot water system isolation valves.
After the work has been completed the initial settings will be
restored.
7.1 General comments
It is recommended that the following inspections be carried
out on the boiler at least once a year:
1. Check the seals in the water part and, if necessary, replace
thegaskets 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 boiler.
4. Following the inspection detailed in point “3”, disassemble
and clean the combustion chamber, if necessary.
5. Check and clean the siphon.
6. Make sure the following heating safety devices are
operating correctly: - temperature limit safety device.
7. Make sure that the following gas part safety devices are
operating correctly:
- absence of gas or fl ame safety device (ionisation).
8. Check the effi ciency of the domestic hot water production
process (test the fl ow rate and temperature).
9. Perform a general inspection of the boiler operation.
10. Remove oxide from the detection electrode using an
emery cloth.
11. These checks are not exhaustive, further mechanical,
electrical and combustion maintenance checks maybe
required.
12. Check and adjust combustion settings (high & low)
The presence of oxide inside the heat exchanger doesn’t
prejudice the performances of the boiler. In case it is
considered necessary to proceed with the cleaning of the
heat exchanger.
Proceed as follows:
CLEANING THE FLUE GAS SIDE
The inside of the primary heat exchanger 19 may be accessed
by dismantling the burner - see picture.
Clean the heat exchanger with a vacuum cleaner with the aid
of a non-metallic brush, by avoiding the use of liquid cleaners
and detergents.
WARNING!
It is mandatory to replace
the seal (g - see picture)
every time the burner is
dismantled.
Moreover, clean the fl ue
gas duct 3 (located in front
of the heat exchanger)
prior to repositioning it.
During the removal of the
siphon, place a container
below the boiler to catch
any spilled water.
7.2 Operational test
After having carried
out the maintenance operations, fi ll the heating circuit at a
pressure of approximately 1.5 bar and release the air from the
system.
Fill the domestic hot water system at the same time.
- Begin operating the boiler.
- If necessary, release the air from the heating system again.
- Check the settings and make sure all the command,
adjustment and monitoring parts are working correctly.
- Check the fl ue system is sealed and operating correctly.
7.3 Draining procedures
The heating system must be drained using the following
procedure:
- Switch off the boiler, make sure the external bipolar switch
is in the OFF position and shut off the gas valve;
- Loosen the automatic air relief valve;
- Open the system drain off cock and collect the escaping
water in a container;
- Empty the water from the lowest points of the system (where
applicable).
If the system is to be left inactive in areas where the room
temperature may fall below 0°C during winter, we recommend
that anti-freeze liquid is added to the water in the heating
system in order to avoid the need for repeated draining; when
this liquid is used make sure it is compatible with the stainless
steel used for the bodywork of the boiler.
We recommend the use of anti-freeze products which
contain PROPYLENE GLYCOLS as these inhibit corrosion and
that they are used in conjunction with the anti-scaling and
anti-corrosion function, in the quantities suggested by the
manufacturer, at the minimum temperature.
Regularly check the pH level of the water/anti-freeze mix in
the boiler circuit and replace it when the value measured is
lower than the limit prescribed by the manufacturer.
DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE.
The manufacturer will not be held liable for any damage
caused by the appliance or the system due to the use of
inappropriate anti-freeze substances or additives.
7.4 Draining the domestic hot water system
Every time there is a danger of freezing, the domestic hot
water system must be drained as follows:
- Shut off the water mains inlet valve;
- Open all 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, perform bleeding where necessary.
Descale the components in accordance with the instructions
provided on the safety data leafl 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.
7.5 Cleaning the primary exchanger
Cleaning the combustion side
The inside of the primary exchanger is accessed by removing
the burner. Clean using a non-metallic rifl e-type brush.
7.6 Cleaning the trap
The trap is accessed by emptying the condensate bowl loca-
ted in the bottom section. Wash with water and detergent.
Replace the condensate collection bowl in its housing.
NB: In the event of prolonged use of the appliance, the trap
must be fi lled before being used again.
A lack of water in the trap may cause products of combustion
to be temporarily released into the atmosphere.
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