Priority; Absolute Priority; Shifting Priority - Siemens RVP360 Basic Documentation

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14.6.2 D.h.w. priority
Depending on the capacity of the heat source, it may be practical to throttle the
amount of heat drawn by the heating circuit(s) during d.h.w. heating, thus acceler-
ating the charging process. In that case, d.h.w. heating is given priority to space
heating.
For that purpose, the controller offers 3 kinds of d.h.w. priority:

Absolute priority

Shifting priority

No priority (parallel operation)
Priority is accomplished by delivering locking signals. The impact of the locking
signals is described in chapter 17.4.5 "Locking signal gain".
14.6.3 Absolute priority
During d.h.w. charging, the heating circuits are locked, which means that they
cannot draw any heat.
Controller with bus connection:
During d.h.w. charging, the controller informs the consumer master that it pres-
ently effects d.h.w. charging with absolute priority. The consumer master is the
device having the same segment number as the controller with device number 1.
The consumer master then sends an uncritical locking signal of 100% to all con-
trollers in the same segment. If the consumer master is located in segment 0,
the uncritical locking signal is sent to all controllers in all segments
14.6.4 Shifting priority
During d.h.w. charging, the heating circuits are throttled if the heat source (the
boiler) is not able to maintain the required setpoint. In that case, the display of
the boiler controller shows
Controller with bus connection:
During d.h.w. charging, the controller informs the heat source in the same seg-
ment that it currently effects d.h.w. charging with shifting priority. If, now, the
boiler is not able to maintain its setpoint, the differential of setpoint and actual
value is integrated and an integral-dependent uncritical locking signal in the
range of 0...100% is generated. If the heat source is located in segment 0, it
sends the signal to all controllers in all segments. If the heat source is located in
segment 1...14, it only sends the signal to the controllers in the same segment
Basic Documentation RVP360
14 Function block: D.h.w.
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CE1P2546en
2017-07-24