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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the heating engineer settings
18.10.2002
4.224 Release of d.h.w. heating
•
Release of d.h.w. heating to the nominal setpoint as demanded by the consumers
•
Release of d.h.w. heating can be matched to the plant's load curve
Makes it possible to limit the period of time during which d.h.w. heating to the nominal
setpoint is released.
Setting range
Unit
Factory setting
0...2 –
1
The setting defines the period of time during which d.h.w. heating at the nominal set-
point is released. Outside this period of time, the reduced d.h.w. setpoint applies. There
is one exception, the “D.h.w. push” function (general control processes).
Release of d.h.w. heating to the nominal setpoint takes place when using the following
settings:
0
24 hours per day
1
According to the heating circuit’s time switch program, with forward shift
2
According to the d.h.w. time switch program of the RVP540 / RVP550
4.224.1 24-hour operation
Setting 0
The d.h.w. is continuously charged to the nominal d.h.w. temperature setpoint, inde-
pendent of the time switch program (operating line 26).
0
6
12
18
24
h
23
71
Z18
4.224.2 Operation according to the heating program
with forward shift,
Setting 1
For d.h.w. heating, the heating circuit time switch programs of the controllers in the se-
lected range are taken into consideration. The selection of the range (local / segment /
system) for which the d.h.w. is produced is made on operating line 773.
The switch-on point for the release is shifted forward in time against the earliest switch-
on point of all heating circuits. The switch-off point for the release coincides with the
last switch-off point of these heating circuits.
At the switch-on point, the controller switches from the reduced d.h.w. temperature set-
point (operating line 770) to the nominal d.h.w. temperature setpoint (operating line 26).
At the switch-off point, the controller switches from the nominal to the reduced d.h.w.
temperature setpoint.
Benefit
Description
Setting
Effect
Example:
