Pleion EGO 110, Installation And User Manual

Page: 56 / 67

Installation and user handbook – rev.0.4 of 23.02.2017
56
EXPANSION VESSEL
The water held in the accumulator of the
“EGO”
solar collector is subjected to notable
thermal excursions and, as a result, important variations in volume.
The system is protected from the overpressure caused by these fluctuations by the safety
and one-way valve which, if necessary, opens and allows the system to return to its correct
working pressure.
Should the user wish to prevent the safety and one-way valve from opening, it is advisable
to use an EXPANSION VESSEL, suitably sized according to use.
When the expansion vessel is assembled, the overpressure that can originate in the
accumulation tank is absorbed by vessel deformation, therefore the safety valve does not
need to intervene in normal conditions of use.
The expansion vessel must be installed between the safety and one-way valve and the
inflow connection of the solar collector.
The expansion vessel must be connected using all the methods indicated for heating
systems, therefore it must be directly connected to the accumulator (without placing valves
or taps between them) and pre-set at a pressure of 0.5 bar less than that of the system
working pressure.
The expansion vessel and its pre-set values must be sized using the normal formulas that
can be found in normal hydraulic documents.
The expansion vessel must be installed by specialist technicians and/or companies.