Immergas Zeus Superior - Primary Circuit Operation; Flow Rate - Head Graph

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STZSkW ed 12/07 ZEUS Superior kW
Technical DocumentationTechnical Documentation
Primary circuit (boiler circuit).
e primary circuit (and its relative control and safety devices)
is enabled every time there is a heating or DHW request.
Operation.
e heat in combustion exhaust is transferred by copper ns
to the water-gas exchanger (8). e water-gas exchanger then
transfers such heat to the water circulating inside it thanks to
the boiler pump (16).
e water is then pushed directly into the system or it can be
diverted to the storage tank coil (2).
is depends on the position of the electric 3-way valve (20)
Head (kPa)
Flow rate Litres/h
A
A = Head available to the system at maximum speed with by-pass excluded (adjusting screw completely tightened)
B = Head available to the system at maximum speed (screw tightened by 1.5 revulution with respect to the completely loose adjusting screw)
C = Head available to the system at maximum speed with by-pass open (adjusting screw completely loose)
Head (m H
2
O)
ZEUS Superior 24 kW
Head (kPa)
Flow rate Litres/h
Head (m H
2
O)
ZEUS Superior 28 kW
B
C
A
B
C
which, according to the type of request, either allows water to
ow through the central heating ow system (M) and return
(R) pipes or diverts the water towards the coil (2).
Flow rate - head graph.
e shape of the curve representing the ow rate-head ratio
will depend on how the system by-pass is adjusted; thus, the
position of the by-pass will provide more or less head to the
system. e graph below illustrates the characteristic curves
according to the by-pass adjustment.