Siemens RVA63.242 User Manual page 121

Effect on 2-position
loads
Switching point
Effect on modulating
loads
Lowering of setpoint
Siemens Building Technologies
Landis & Staefa Division
Due to deactivation of the pumps, heat consumption will be reduced. The heating up
time for d.h.w. will thus be considerably shorter.
• Heating circuit pump:
Status
Locking signal = 20 %
Locking signal = 20 %
Locking signal = 93 %
• D.h.w. pump / system pump or boiler pump:
−
No effect
Through the generation of the temperature-time integral it is not only the period of time
that is considered, but also the extent of the boiler temperature's undershoot. This
means that if the crossing is significant, the pumps will be deactivated earlier.
Due to the lowering of the setpoint, heat consumption will be reduced, which means
that the d.h.w. will be heated up much quicker with minimum impact on the heating
circuit. This reduces considerably the heating up time for d.h.w., with a minimum impact
on the heating circuits.
• Mixing valve:
Status
Locking signal > 0 %
Locking signal reduced to
0 %
Through the generation of the temperature-time integral it is not only the period of time
that is considered, but also the extent of the boiler temperature's undershoot. This
means that if the undershoot is significant, the setpoint reduction will be greater.
Basic Documentation RVA63.242, RVA53.242
Description of heating engineer settings
Effect
Normal pump operation
Heating circuit pump cycles
Heating circuit pump OFF
Effect
Flow temperature setpoint will be lowered.
The extent of lowering is dependent on the magnitude and
the period of time of the boiler temperature's undershoot.
Setpoint according to the normal control condition
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CE1P2373E
26.03.2001