MAINTENANCE AND CLEANING
Regular maintenance by qualified staff, strictly in accordance with the manufacturers instructions is essential for the
efficient operation of system.
Periodic inspections
* Check the water level or pressure either in open vented or pressurised systems. The hydrometer must be marked
after first filling of the boiler. So water level can be checked regularly. If the water level or pressure is under the level
of static pressure or the system set-up, a water make-up is needed. The make-up water should be softened according
the local regulations before feeding into the system to prevent corrosion inside the heating circuit and the boiler.
* Front doors of the boiler should be checked for properly closing. Fibre-glass ropes must be replaced if necessary.
* Check the condition of refractory inside the front section. If it is damaged, you will have higher surface temperatures
on front doors. In this case the refractory should be replaced to save energy and prevent further crack.
* Check if there is flue gas leakage from the chimney connections of the boiler, and have it fixed if necessary.
* Check correct operation of thermo-regulator on top of the boiler. If needed you can slightly shift the setting of thermo-
regulator for better combustion for your boiler capacity. If air is not enough for combustion, there will be excessive
soot formation on heating surfaces, as well as fumes (or odours). So you should let more air re-adjusting the pirmary
air damper setting to get richer combustion. If air is too much for combustion, solid fuel will be consumed rapidly. In
this case we recommend to reduce air inlet by either primary air, or flue damper on the smokehood.
* Check the heat transfer surfaces of cast iron sections. The soot formation will change according to fuel type you use,
and the combustion air amount. So if you feel that the outlet water temperature can not reach the usual values with
the same conditions, heating surfaces therefore should be cleaned
Cleaning of boiler
Before cleaning the boiler, switch the pump and other electrical appliances in boiler room off.
To clean the boiler:
* Clean all heating surfaces using the brush supplied with the boiler.
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* Clean the by-pass holes between combustion chamber and second flue gas passages with supplied fuel poker
* Clean the fresh air inlet section at the bottom level of intermediate sections with supplied fuel poker
* Collect all soot deposits inside
* Remove the disposals.
Maintenance
Before each heating season we would recommend you to call for the contracted service agent to check the boiler,
heating system, electrical connections, and chimney conditions. Do not attempt to carry any maintenance work
without getting help from qualified people.
Safety heat exchanger
*The valves on the sanitary connections of safety heat exchanger must always be kept open.
*Dunatech can only be used with origial safety heat exchanger kit which is tested and approved for each
boiler model.
*Cold water must never be delivered directly to boiler inlet in order to solve overheating porblems as this
will result in serious damage on boiler body. That application will end the warranty of the boiler.
* Make sure that the valves on the drain valves are open.
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Summary of Contents for DUNATECH 2012
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