Alarko ACK2, Руководство по эксплуатации

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19
Expansion cisterns: Boilers in an open vented system shall be connected to an
expansion cistern, which, is installed at the highest point of the heating system.
They shall be dimensioned so that changes in water volume due to heating up
and cooling down can be accommodated. Open vented system expansion cisterns
shall be provided with a cistern vent and overflow pipe that cannot be blocked. The
overflow pipe shall be dimensioned so that it can safely drain off the maximum
mass flow rate entering the system, which can be achieved by selecting the
overflow pipe to be one DN-size larger then the filling pipe.
Expansion cisterns, safety pipes, open vent and overflow pipes shall be
designed and arranged to protect against freezing.
Installation example is given in figure ….
Safety pipes, feed and expansion pipes: Boilers shall be connected to an
expansion cistern and served by an open vent pipe. The expansion cistern shall
be vented to the atmosphere. The feed and expansion pipe shall be connected to
the lower part of the expansion cistern. Shutting off the safety pipe or the feed and
expansion pipes shall not be possible.
The minimum internal diameter of the open vent safety pipe and feed and expansion
pipe shall be:
Safety pipe: d
s
= 15 + 1.4 mm (but not less then 19 mm internal diameter)
Feed and expansion pipe: d
fe
= 15+ 1.0 mm
Where is the nominal heat output of the boiler in kW.
MINIMUM SAFETY EQUIPMENT REQUIRED FOR OPEN VENTED
SYTEMS