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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the heating engineer settings
18.10.2002
The consumption of heat is considerably reduced through the reduction of the flow
temperature setpoints. This reduces considerably the heating up time for the d.h.w.,
with a minimum impact on the heating circuits.
•
Mixing
valve:
Status Effect
Locking signal > 0 %
Flow temperature setpoints will be lowered.
The extent of lowering is dependent on the magnitude and the period of
time of the undershoot.
Locking signal reduced to
0 %
Setpoints 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 boiler temperature undershoot. This means
that when the undershoot is significant, the setpoint reduction will be greater.
4.231 D.h.w. priority when charging with the buffer
storage tank
•
Optimum distribution of the heat contained in the buffer storage tank
Defines the priority of d.h.w. heating over space heating.
This function works only if “Automatic heat transfer from the buffer to the d.h.w. storage
tank” is activated (operating lines 530…535).
Setting range
Unit
Factory setting
0...2 –
1
Entry:
0 Absolute
priority
The controller-internal heating circuit and the heating circuits of other controllers
connected to the LPB will be locked until the d.h.w. is heated up. The system
pump remains in operation provided it is located before the d.h.w. storage tank
and appropriately parameterized.
1 “Shifting”
priority
The temperature criterion used by “shifting” priority is the mean value of the set-
tings on operating lines 534 and 535 ((534 + 535) / 2).
As long as the temperature acquired by buffer storage tank sensor B4 at the top
(TPx) lies above that mean value, the d.h.w. is heated with no priority (setting 2).
When the temperature drops below the mean value, the rest of the d.h.w. is
heated with absolute priority (same as setting 0).
2 No
priority
D.h.w. heating and space heating take place at the same time.
Impact on modulating
loads
setpoint reduction
Benefit
Description
Setting
Effect
