This function is available from REG and RegConfig firmware version 4.32 onward within the ELETTRA/SOLAR page of RegConfig.
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Water flow sensor and water Outlet Temperature that are both detected by the Grundfos VFS meter via the REG2VFS interface (for installation and configuration see the REG2VFS data sheet)
DHW Producers Number: indicate the number of producers installed
P07 Minimum Active generator number: indicated the minimum number of valves that are always left open and consequently the minimum number of generators that will be switched on as soon as the flow rate detected will be greater than zero. Setting this value > 1 could be useful in the case of large system where the activation of only 1 producer on departure could lengthen response time.
P08 Maximum Active generator number: indicated the maximum number of generators that can be activated simultaneously. If 5 generators are enabled, but the maximum number is 3, this means that at most the algorithm can switch on 3 generators even though 4 would be needed. This choice could be useful in the case you have calculated, for example, 3 producers are sufficient, but you have decided to install more to have redundancy and therefore give reliability to the system.
P09 Excluded generators: if maintenance is being carried out on a producer or a producer is faulty and awaiting repair, it can be excluded from the cascade by simply flagging the relative box. This function of excluding generators could also be useful in the case of diagnostic or ignition, if only 1 specific producer is to be switched on at a time.
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P01 New generator threshold [l/min]: this is the threshold above which the next valve is opened. Therefore, if the threshold is 15 l/min, up to this flow rate value only one valve will be opened, above 15 l/min at least for time P03, a second valve will be opened, above 30 l/min (for P03 time) a third valve will be opened and so on.
P02 Hysteresis shut off generator [l/min]: if the flow rate, instead of increasing decreases, the valves will be shut down. This parameter allows a hysteresis to be considered as to have as little pendulum as possible. Let's take the example from the previous point assuming P02 is 3 l/min: if flow rate drops below 30-3 l/min for time P04, valve number 1 (the one that was open at the start of the cycle) will be shut down. When flow rate drops below 15 - 3 l/min for time P04 then the second valve will also be closed. When the flow rate goes to zero, the last producer still running will stop, but its valve will remain open.
P03 New generator counter [s]: this is the time for which the flow rate must remain over the threshold before one more valve is opened
P04 Shut off generator counter [s]: this is the time for which the rate flow must remain below the threshold minus hysteresis value before a valve is closed.
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A diagram is shown to better explain parameters P01, P02, P03, and P04; in red the flow rate trend over time, in blue the thresholds (multiples of P01) and in yellow the hysteresis referring to each threshold (always equal to P02):PHOTO TBD
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Instant DHW Producers cascade status and output setting
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