123
Siphon
Disassemble the siphon and clean every part of it. Check
the siphon connection of the heat exchanger for any
blocking or pollution and clean it (if necessary). Check the
functioning of the siphon by pouring clean tap water in the
burner room (when burner door is removed). This water
will exit the heat exchanger by the siphon. Notice: don’t
wet the rear wall insulation.
Do NOT operate the unit without mounted and
completely filled siphon reservoir.
This is a safety measure: the water in the
siphon keeps the flue gases from entering
the plant room via the condensate drain.
Heat exchanger and burner room
After the removal of the complete burner unit, check if there is any debris and dirt in the heat exchanger. The coils of
the heat exchanger can be cleaned by using a non-metallic brush. After this the dirt and dust can be removed with a
vacuum cleaner and by flushing the burner room with water. Don’t forget afterwards to clean the siphon once again.
Cleaning the burner room with acid or alkali products is prohibited.
Gas/air ratio
With every service check and/or maintenance of the boiler always check the gas/air ratio by measuring the CO
2
percentage (flue gas) at the maximum and minimum load of the boiler. If necessary adjust these values, see for
information chapter 14
“Adjusting and setting the burner”.
Pump
Check the electrical parts and the motor of the pump for a correct functioning. The pump must generate a sufficient
water flow over the (heat exchanger of) the boiler. When the pump produces noise, is operational for more than 5
years or has signs of water leakage it is recommended to replace the pump as a precaution.
When defects and abnormalities are found by the service engineer during service and maintenance and
these are not repairable, this information should be reported to the owner/end-user of the installation. Also,
the owner/end-user should be advised how to fix these defects and these defects should be reported in the
service report / log file of the boiler.
During service and maintenance, the gas, supply air, flue gas and condensate connections are discon-
nected, checked and replaced. Make sure that all these components are mounted correctly before commis-
sioning the boiler again.
18
USER INSTRUCTIONS
After installing and commissioning of the boiler demonstrate the operation of the entire central heating system to the
end-user. The user should be made familiar with all safety precautions of the boiler and the installation. The user
should be instructed that service and maintenance of the boiler is required every 12 months. Regular service and
maintenance is essential for a safe and proper operation of the boiler. Hand over the documents that are supplied
with the boiler.
Turn LEFT to open
Turn RIGHT to close
Fill with
water
to the
edge
