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In open system it is necessary to put an open expansion vessel min. 0,5 m above the height of the
highest heating body. If expansion vessel is located in a room without heating, it should be insulated.
The system pump could be connected on the inline or back line of the boiler.
4.1.1. CONNECTION TO OPEN HEATING SYSTEM
4.1. CONNECTION TO CENTRAL HEATING SYSTEM
All installation work must be made in accordance with valid national and European standards.
Boiler Polifuel can be built in closed and open central heating systems. In both cases boiler can be fired
with wood chips. Installation has to be made, in according to technical standards, by a professional who
will be responsible for proper boiler operation. Before connecting boiler to central heating system, the
system has to be flushed to remove impurities remaining after system installation. It prevents boiler
overheating, noise within the system, disturbances at a pump and mixing valve. Boiler should always be
connected to central heating system by connectors, never by welding. Figure 1. shows safe distances
required for boiler cleaning and maintenance.
4.0. INSTALLATION
All local regulations, including those referring to national and European standards need to be complied
with when installing the appliance.
Installation, connection to central heating system
4.1.2. CONNECTION TO CLOSED HEATING SYSTEM
In closed heating system it is obligatory to build in certified safety valve with opening pressure of 2,5 bar
and a membrane expansion vessel. Safety valve and expansion vessel must be built in accordance with
professional rules and between safety valve and expansion vessel and boiler must not be any valve.
Schemes for possible configurations are on following pages.
18
Technical instructions Polifuel
18


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