MAINTENANCE
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Important
Maintenance is an essential part of the safe and
efcient 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 efciency 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 to the “OFF” position;
- Close the gas valve and the central heating and domestic
hot water system valves.
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 boiler 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 boiler.
4. Visually check 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, if necessary.
7. Cleaning the primary heat exchanger
8. Make sure the following heating 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. Check the efciency of the domestic hot water production
process (test the ow rate and temperature).
11. Perform a general inspection of the boiler operation.
12. Remove oxide from the detection electrode using an emery
cloth.
13. These checks are not exhaustive. Further mechanical,
electrical and combustion maintenance checks may be
required.
Operational test
After having carried out the maintenance operations, ensure
the system is lled and bled fully of any excess air.
- 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 ue system is sealed and operating correctly.
Draining procedures
The heating system must be drained using the following
procedure:
- Switch off the boiler, make sure the 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 mimimum 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.
Draining the domestic hot water system and indirect cylinder
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, performing bleeding where necessary.
Descale the components in accordance with the instructions
provided on the safety data leaet 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.
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.
Cleaning the primary exchanger
Cleaning the combustion side
The inside of the primary exchanger is accessed by removing the
burner. Wash with water and detergent using a non-metallic rie-
type brush, rinse with water.
Cleaning the trap
The trap is accessed by emptying the condensate bowl located 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 lled before being used again.
A lack of water in the trap is dangerous and may cause products
to be released into the atmosphere.
WARNING!!
THE AUTOMATIC CALIBRATION MUST BE DONE IN
CASE OF:
- REPLACEMENT OF: FAN, GAS VALVE, AIR/GAS
MIXER, BURNER, ELECTRODE.
- REPLACEMENT OF P.C.B.
- GAS CHANGEOVER
- ANY MODIFICATION TO THE FOLLOWING
PARAMETERS
220 - SOFT IGNITION
231 - MAX CH ADJUSTABLE
232 - MAX DHW PERCENTAGE
233 - MIN PERCENTAGE
234 - MAX CH PERCENTAGE
After servicing, complete the relevant
Service Interval Record section of the
Benchmark Checklist located on the
inside back pages of this document
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