14
CHT
PI
H
RP
RP
RW
RO
CTwp
F
ZZ
Pco
F
Pco
RB/RW
TP
RB
ZZ
ZRC
ZT
PI
H
CHT
RW
RP
RP
RO
Pco
F
ZZ
ZTM-t
RB/RW
RB
TP
ZT
ZRC
Hydraulic connection
Hydraulic connection consists in connecting the system supply and return pipes to appropriate stub pipes
of the boiler.
Recommendations concerning installation of the boiler:
• The system must meet all valid legal regulations, codes and conform to the best building practices.
• The boiler can be operated only in open-type heating systems meeting the requirements of Polish
standard PN-91/B-02413 concerning protection of open-system water heating devices and expansion
vessels.
• No isolating valves are allowed between the boiler and expansion vessel.
• The hydraulic system of boiler room must ensure the minimum return water temperature at the level of
55
o
C. The requirement can be met e.g. by using three-way temperature valves (like the valves type TV
manufactured by ESBE Company), mixing pump or other devices able to ensure the required return
temperature automatically.
• During boiler operation, the recommended temperature difference between supply and return is
10-20
o
C.
Exemplary schemes of hydraulic connection
Radiator-type central heating system with one heating loop and mixing pump
Radiator-type central heating system with one heating loop and mixing valve
Expansion
vessel
Expansion
vessel
HEATING LOOP
HEATING LOOP
