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Translation from original instructions
7.3.6 Flowzer VPS
The “VPS” function modulates the flow rate to the primary circuit following the flow of the secondary circuit, taking as re
-
ference the difference in the water temperature measured between the outlet of the primary circuit and the bypass pipe.
Water flow rate control in the primary circuit always takes place within the limits set for correct operation of the refrigerant
unit.
If the flow in the secondary circuit is reduced, so is the flow in the primary circuit, which results in energy consumption sa
-
ving.
This function requires the installation of a temperature sensor on the bypass pipe. The sensor must be connected as shown
in the wiring diagram.
For this function to be applied correctly, the hydraulic circuit must be made as shown in the diagram below.
Vmin.
U2
U1
Un
Y2V
Y2V
Y3V
VSP
BTWB
VPP
A2
UL
UE
BT2
BT1
ΔPex
BP41
The abbreviations present in the diagram indicate:
- A2 = cooling unit controller
- BT1 = unit input temperature sensor
- BT2 = unit output temperature sensor
- EU = heat exchanger in cooling unit
-
BP41= differential pressure sensor;
- BTWB = temperature sensor on bypass pipe;
-
U1, U2 .. Un = points of use present in the system/plant
- Y2V = 2-way valve servo controls
- Y3V = 3-way valve servo controls
-
Vmin = minimum water volume in the system/plant
- UL = limit of the supply.
When making the hydraulic circuit as shown in the diagram, attention must be paid to the following:
- the bypass pipe must be of the same diameter as the connections of the unit;
-
the temperature sensor must be installed as instructed in the section “System components”;
-
To give greater reactivity to the system/plant and to reduce the capacity of the tank, the points of use furthest away from
the refrigerant unit must be fitted with a three-way instead of a two-way valve.
-
the tank must supply the amount of water required to ensure that the min. volume specified in the unit installation ma
-
nual is circulated, even with the user points off.
