6
Mareli Systems
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Set the red arrow to gauge the correct pressure of at least 1 bar overpressure (valid for closed systems).
In open systems the maximum water level in expansion tank is 25 m above the bottom of the boiler.
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Add and relief water in the heating network through the loading and unloading valve until the desired
working pressure is reached.
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During the filling process make sure the heating installation is air tightened.
Adjustment of the reducing valve of the exhaust gas pipe
The reduction valve of the exhaust gas pipe must be adjusted according to the exhaust gas installation and the
fuel type. In open position (the lever is horizontal to the exhaust gas pipe) a higher temperature of the exhaust
gases can occurs, but with lower energy conversion efficiency. Inform and explain the adjustment to the user
of the unit.
Servicing the heating installation (for user)
5.Functions of the separate elements
Ignition valve
The ignition valve of the water heating boiler is
placed in an inclined position. By doing so the con-
nection of the heating gas flow is short circuited in
order for the hot gases to reach the chimney faster
and for a greater chimney draft.
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For this purpose, push the valve lever back-
wards.
In a normal functioning mode (ignition valve in
horizontal position) the hot gas warms the incom-
ing gas flow and this results in better gas efficiency.
•
For this purpose, pull the valve lever at the
rear side of the heating boiler to a vertical po-
sition (after 10-15 minutes).
Info: An excessive air supply may extinguish the
flame due to the excessive forming of gas prod-
ucts from the combustion. In this case a re-ad-
justment of the air supply is needed.
Cleaning the heating boiler
Empty the ash container before it is fully filled in
order to ensure air flow from bellow.
Attention!!! Fire risk due to hot ashes.
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If the ashes are still hot wear protective gloves.
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Empty the ashes in non-flammable pot with lid
Cleaning the heating boiler
The soot and ash accumulation on the walls deriving from the gas reduce the heat conduction. Precipitation,
tar accumulating and condensation depend on the fuel type that is used (for example wood forms greater
quantity than coals), chimney’s draft and the working mode. We recommend cleaning at least once a week in
a cold state of the system.
Instruction!!! Inefficient operation
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Due to insufficient cleaning the fuel consumption may increase which may lead to environmental pollu-
tion. Clean the heating boiler at least once a week.
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Clean the walls of the combustion chamber carefully in order to avoid damage to the fire-clay bricks.
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If the lid doesn’t come off this means that the chamber is covered with tar. Hit the cleaning lid cautiously
with a hammer several times.
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Clean the walls of the heating surfaces, the combustion chamber and the reserve fuel chamber with a
cleaning scoop.
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Clean the grills with an ash knife.
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Gather the soot and the ashes in the ash container.
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We recommend annual revision of the heating boiler, performed by an authorized heating firm and
check of the system’s technical data, for example exhaust gas temperature.
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Open the filling valve and the top plate.
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Pull the ignition valve. This ensures the gas access to the paths and walls of the heating boiler.
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Pull out the lid of the cleaning hole from the combustion chamber so the combustion waste can fall freely
in the ash container.
