10
The components above and the pump inverter must be selected at the time of the pre-sale agreements, de
-
pending on the features of the system. This has an impact on the quotation of the option and on the supply
terms of the concerned components.
In particular, the unit includes an additional control system, equipped with an advanced algorithm, which in
-
teracts with the main advanced Bluethink controller.
Flowzer VPS has the advantage of:
•
being ideal for renovations of existing systems, especially for comfort applications
•
achieving a complete variable flow system, with maximum energy saving
•
implementing a flexible design, e.g. for scalable or multi-zone systems
The maximum energy saving is achieved thanks to the advanced algorithm, which prevents hunting by the
inverter and balances the pump speed and the recirculation flow rate to a minimum.
With refurbishments, the system's capex is limited to the unit and its commissioning.
The dimensions of the inverter of the unit and of the pump module can be favoured by the low design dis
-
charge head of the primary circuit.
The operating principle can be summarized as follows:
•
Flowzer VPS performs intelligent control of the flow rate on the primary circuit, and balances it compared to
the flow diagram of the secondary circuit
•
the system controller modulates the pump speed according to the condition detected by the system sensors
T
•
if the system terminals are switched off, the flow rate of the secondary circuit will decrease; therefore the
direction of flow is detected indirectly as temperature difference by the system sensors through the separa
-
tor or the bypass pipe
• the system controller will consequently force the primary pump to reduce its speed, 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
In the required minimum load condition (that is, with all system terminals switched off), the necessary mini
-
mum volume (V
min
) must be ensured by the relevant tank to be installed between the unit and the decoupler
or bypass pipe.
The temperature sensors of the system T provide a 4-20 mA signal and require 1/2" female fittings.
Further details can be found in the relevant manual.
