Siemens RVA53.242 - Page 121

121/218
Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
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 Effect
Locking signal = 20 % Normal pump operation
Locking signal = 20 % Heating circuit pump cycles
Locking signal = 93 % Heating circuit pump OFF
• 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 Effect
Locking signal > 0 % 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.
Locking signal reduced to
0 %
Setpoint according to the normal control condition
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.
Effect on 2-position
loads
Switching point
Effect on modulating
loads
Lowering of setpoint