6
Mareli Systems
Ensuring the temperature of return water
For normal operation, the return water temperature should not drop below 55ºC. Therefore a thermostatic
mixer to raise the temperature of return water must be mounted to the reverse heating pipe.
Establishing operating pressure
To start you need to establish normal operating pressure
Instruction!!! Installation damages due to pressure in the material as a consequence of temperature differences.
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Fill the heating installation in cold condition only (the maximum incoming temperature can be 40º С).
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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)
Attention!!! Hazard to life in case of non-observation of the safety prescriptions
Functions of Individual Elements
Strong fanning can lead to flame extinguishing due to excessive production of gaseous products of combus-
tion. In this case you should readjust air supply.
Boiler Cleaning
Empty the ash drawer before it fills up so that there is air supply from beneath.
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
Boiler cleaning
Soot and ash deposits on the walls of the hot gas ducts reduce heat transfer. Formation deposits of tar and
condensation depend on the fuel used. We recommend at least one cleaning per week in cold state.
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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Open the doors and the manhole behind
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Clean the walls of the heating surfaces, of the burning chamber and of the pipes with a cleaning spade.
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Clean the grids with an ash knife.
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Gather the removed soot and ash in the ash drawer.
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We recommend yearly boiler inspection by a company specialized in heating systems.
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Check up on the technical data of the installation, for example exhaust fumes temperature.
Boiler Decommissioning
In order to decommission the boiler, let the fire in the boiler to go out completely. Acceleration of the process
is not recommended.
