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Flowzer VFPP has the advantage of:
•
implementing an innovative design, which is alternative to the classic system based on fixed flow-rate pri
-
mary circuit plus secondary circuit
•
being ideal for new or entirely redesigned systems, especially for comfort applications
•
achieving a complete variable flow system, with maximum energy saving
•
simplifying the layout of the user circuit
•
limiting the capex of the system
•
achieving complete and reliable control of the system
The maximum energy saving is achieved thanks to:
•
a hydraulic decoupler managed by the modulating bypass valve, which regulates the bypass flow rate on
the lowest possible value
•
an advanced algorithm to prevent hunting by the reversing valve and by the bypass valve, thereby balanc
-
ing the pump speed and the bypass speed to a minimum
The capex of the system is also reduced thanks to:
•
small internal footprint, due to the simplified layout
The operating principle can be summarized as follows:
•
Flowzer VFPP carries out constant control of the discharge head
•
the system controller modulates the pump speed according to the condition detected by the system trans
-
ducers Δp
p
•
if the system terminals are switched off, the pump speed will decrease
•
the pump speed can be reduced until it reaches the minimum allowed flow rate on the heat exchanger of
the unit
•
this flow rate is indirectly monitored through the losses detected by the differential pressure transducer Δp
e
•
When the minimum allowed flow rate threshold is exceeded, the control system will open the bypass valve
V
bp
to recirculate the flow rate that is not required by the system, but is necessary to guarantee the mini
-
mum flow rate to the heat exchanger.
In the required minimum load condition (that is, with all system terminals switched off), the required minimum
volume (V
min
) must be concentrated in the relevant tank, to be installed between the unit and the bypass valve.
The bypass valve V
bp
is controlled through a 0-10 V signal and must therefore be installed within 30 m of the
unit.
The pressure transducers of the system Δp
p
provide a 4-20 mA signal and require two 1/4" female fittings.
These transducers must be installed within 200 m of the unit, near the system terminal that is affected by
the highest line head losses or in any case in a position where it is possible to measure an adequate pressure
value.
Further details can be found in the relevant manual.
FVPS FLOWZER VPS – Kit for variable flow rate pump with temperature sensors
Bluethink solution for a variable flow rate system, consisting of a primary circuit plus secondary circuit.
Flowzer VPS includes:
•
a differential pressure transducer, installed at the factory at the ends of the user-side heat exchanger of the
unit (Δp
e
)
•
a dedicated control system, installed at the factory in the electrical control panel of the unit (Sc)
•
two system temperature sensors (T) - supplied separately; installation by the customer
