Operational requirements of open vented systems: In order to maintain a
safe and economical operation, open vented heating systems shall be equipped
with:
20
x Water level indicator
x Temperature indicator (% 20 higher then the operating temperature and
mounted in the flow pipe of the system)
x 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.
x 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
x An adequate supply of combustion air is important for safe and clean
combustion. For open flue heating systems with a total rated output
higher than50 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
.
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