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The purpose of the function "Shifting priority" is to achieve optimum d.h.w. heating. This means that during
d.h.w. heating, the actual boiler temperature should be as close as possible to the boiler temperature
setpoint without shutting down the burner. To achieve this, it may be necessary to restrict the heating
circuits by means of a locking signal. Depending on the consumer, the locking signal will lead to switching
on / off or a setpoint reduction.
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Cycling or deactivation of the pumps will reduce the amount of heat drawn from the
heat source. This will considerably shorten the time required for heating up the d.h.w.
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No effect.
Switching point:
The locking signal not only takes account of the duration, but also of the size of the
differential. This means that when the crossing is significant, the pumps will be de-
activated earlier.
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The consumption of heat is considerably reduced through the reduction of the flow
temperature setpoints. This reduces considerably the heating up time for d.h.w., with a
minimum impact on the heating circuits.
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Reduction of the setting:
The locking signal does not only take into account the duration, but also the size of
the differential. If the differential is significant, the setting reduction will be greater
than in the event of a small differential.
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Locking signal < 20 %
Normal pump operation
Locking signal > 20%
Heating circuit pump cycles
Locking signal > 93%
Heating circuit pump cycles
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Locking signal greater than 0%
Room temp. setting is reduced
this reduction depends on significance and
duration of the lower threshold overshoot.
Locking signal reset to 0%
Setting according to normal control status