Technical data

45
4.3.1 Filling the system
Byusingthewater-llingtapundertheboiler,onecansimplyllthesys-
tem with water until system pressure reaches 1-1.2 bar and then close it.
Ifheatingsystemhasitsownllingtapandifitisdesiredtouse,the
watermustbelledbyacompetentandauthorizedperson.Inthiscase
there must be no permanent connection to the mains water supply, even
ifanon-returnvalveistted(seeFig.23).
ATTENTION! Domestic hot water system parts should obey all local
regulations.Ifthereisaneedtollwateratlowpressure,aprovision
should be made.
HARMONY_D USERS INSTALLATION AND SERVICE MANUAL
35
Figure 22 Additional Expansion Vessel
IMPORTANT
All water pipe connections throughout the sealed system must be capable of holding a
pressure of up to 3 bars.
Radiator valves must conform to the appropriate standard.
Relief valve discharge must be directed away from any electrical components or from
positions where it would cause a hazard to the user.
A suitable drain cock must be fitted to the lowest point of the system.
For circuit design purposes, one should consider the information given in Fig. 24 relating to
the available pump head.
Figure 23 Additional Expansion Vessel