5
Mareli Systems
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Install an exhaust connection with a manhole for cleaning.
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If possible the exhaust pipe must be short and with a minimum slope of 5% from the boiler to the chim-
ney upwards.
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Carefully install the exhaust pipe, which is fastened only to the chimney, and put it on the exhaust fumes
nozzle so that it can not slip out.
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Attach additional pipes over 2 m long. All parts of the exhaust pipe must consist of non-combustible
materials.
Attention!!! Suffocation hazard due to lack of oxygen in the installation room.
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Ensure sufficient fresh air supply through holes out.
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Risk of injury/damage to equipment due to lack of combustion air can lead to tar and noxious gas
formation.
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Ensure sufficient fresh air supply through holes out.
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Notify the user of the installation that these holes must remain open.
Building Hydraulic Connections
Instruction!!! Damaging the installation due to non-isolated joints. Install the connecting pipes without ten-
sion to the boiler joints.
Info: For low condensation of exhaust fumes and extending the boiler life, we recommend to equip it with a
return temperature raising device. It prevents dropping of boiler water temperature below 55 °C.
The next step after installing the boiler and connecting it to the pipelines and power supply is filling the boiler
and the adjacent heating system with water. Check all connections of the boiler, internal and external, for leaks.
Check the position of the ceramic components in the burning chamber and all electric connections.
The pellet hopper should be filled to at least ½ of its volume in order to ensure sufficient amount of pellets for
the boiler to be started.
Connecting the safety heat exchanger
In the countries where the EN 303-5 is in force, the heating boiler must be provided with overheating pro-
tection. By doing so the maximum water temperature of 100º С won’t be exceeded (overheating protection).
The minimal working pressure of the water must be equal to 2 bar (the maximum – to 6,0 bar). There must be
an available capacity of at least 11 l/min.
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Connect the safety heat exchanger according to the hydraulic chart with a thermal safety switch (acces-
sories).
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Mount a filter in the flow of cooling water to the thermostatic valve.
Filling the heating installation and insulation check
Check insulation before putting the installation into operation in order to ensure that no leaks are present.
Exercise upon the heating boiler a pressure equal to 1,3 of the allowed working pressure (keep in mind the
safety pressure of the safety guard valve).
Instruction!!! Installation damage due to freezing.
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If the heating installation and the pipe network are not constructed with anti-freezing protection, we
recommend filling the installation with liquid with a low freezing point and anti- corrosion and an-
ti-freezing agent.
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Installation damage due to excessive pressure during the insulation test. Pressure devices, regula-
tors and safety switches may be damaged due to high pressure.
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Make sure that during the insulation test no pressure devices, the joints to the water tank of which can-
not be closed, are mounted.
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Close the connection between the enlarging pot and the system by closing the valve.
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Open the mixing and the stopping valves from the water heated side.
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Connect the tubing to the water valve. Place a hose full of water on to the hose socket of the loading and
unloading valve, secure it with a clamp and open the loading and unloading valve.
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Turn the cap of the automated air tighten-er one full spin so the air can be pumped out.
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Slowly fill the heating installation. During this process watch the pressure indication (manometer).
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When the desired working pressure is reached close the water valve and the loading and unloading valve.
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Check the insulation of the connections and the pipes.
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Pump the air out of the heating installation via the air tightening radiator valves.
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If after the air tightening the working pressure decreases additional water must be filled in.
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Release the hose from the loading and unloading valve.
