6
STV50 ed 09/08 VICTRIX 50 Rev. 002
Primary circuit (boiler circuit).
e primary circuit with relevant control and safety devices
is triggered each time there is a request for central heating
or antifreeze.
Operation.
e heat contained in the ue produced by combustion is ab-
sorbed by the pipes of the coil water-gas exchanger tted in the
condensation module (13), which, in turn, transfers it to the
water circulating inside thanks to the boiler circulator (28).
Flow-head graph.
e trend of the curve that represents the ow-head ratio
depends on circulator speed.
A = Head available to the system at maximum single boiler speed
B = Head available to the system at second single boiler speed
C = Head available to the system at maximum speed with check valve for boilers in cascade (battery)
D = Head available to the system at second speed with check valve for boilers in cascade (battery)
1
Circulator.
e circulator works on the primary circuit return and is it
physically coupled to the components supporting plate.
A threaded tting on the body is used to x the automatic air
vent (1) directly.
Head (kPa)
A
Flow Litres/h
B
C
D
Head (H
2
O)
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