Specifications

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Operational requirements of open vented systems;
In order to maintain a safe and economical operation, open vented heating systems
shall be equipped with:
Water level indicator
Temperature indicator (% 20 higher then the operating temperature and
mounted in the flow pipe of the system)
Devices for controlling the operation temperature to adapt the heat supply to
the heat demand. The maximum set-point of the temperature controller shall not
exceed the maximum operating temperature of the boiler.
Heating system shall be equipped with devices to fill the system and provide
adjustment of the water level. Connections to a drinking water supply system shall
comply with prEN 806-2, e.g. back flow prevention
An adequate supply of combustion air is important for safe and clean
combustion. For open flue heating systems with a total rated output higher than
50 kW, the rule regarding the supply of combustion air is treated as satisfied, if the
cross-section of the aperture leading into the open air is at least 150 cm2 and is 2
cm2 larger for each kW of rated output above 50 kW
.
8.2 BURNER SELECTION
Boilers must be fired by a compatible burner certified to EN 676 (gas firing) or
EN 267 (oil firing) to comply with the boiler efficiency requirement (92/42/EEC)
directive and Appliances burning gaseous fuels (90/396/EEC) directive
The burner must be suitable for the respective rated output and the resistance
on the flue gas side of the boiler. The material of the burner head must be suitable
for operating temperatures of at least 500 C.
Boiler combustion chamber dimensions and flue gas side resistances are
according to the current regulations.
BURNER INSTALLATION
The burner should be installed to the hinged boiler front door by the help of
burner plate, which is the standard delivery.
The ballast tube of the burner must protrude from the thermal insulation on the
boiler door. If the burner ballast tube to be used is short or very long then verify
perfect functioning by burner and boiler manufacturer.
If the burner ballast tube diameter is less then the boiler door please fill the
gap with thermal insulation material supplied by the boiler.
Flange connections shall be air tight always. If there will be combustion hot gas
leakage from the flanges to the boiler room it can be poisonous and hot gases will
overheat the boiler front door.
Burner shall be adjusted according to the boiler output. In two stage or
modulating burners low fire output adjustment be sure that flue gas temperature is
not lower then the condensation point of flue gas.
8.3 FUELS
ACK2
boilers can be fired with the fuels;
Oil (according to DIN 51 603 and/or to local limitations)
Natural gas, LPG and Town gas (according to EN 437 and/or to local limitations)