65/118
Siemens
Heating and D.h.w. Controller RVL481
CE1P2541en
Building Technologies
17 Function block "Release of d.h.w. heating"
20.05.2008
17
Function block "Release of d.h.w.
heating"
Based on the settings made, function block "Release of d.h.w. heating" determines at
what times d.h.w. heating will be released to the NORMAL d.h.w. setpoint.
17.1 Operating
line
Line Function, parameter
Factory setting (range)
Unit
123
Release of d.h.w. heating
2 (0…2)
17.2 Release
17.2.1 Function
On operating line 123, it is possible to select at what times d.h.w. heating is to be re-
leased to the NORMAL d.h.w. setpoint. Released means:
•
With plants equipped with a d.h.w. storage tank (plant types x–1, x–2, and x–3): Stor-
age tank will be recharged as needed
•
With plants using instantaneous d.h.w. heating (plant type x–4): The valve in the pri-
mary return is controlled such that the required d.h.w. temperature at sensor B3 will be
reached
This function makes it possible to reduce the d.h.w. temperature during nonoccupancy
times to the REDUCED setpoint (at night) or to shut it down (e.g. during holiday peri-
ods).
If d.h.w. heating in the summer takes place alternately with an electric immersion
heater, the latter will be released continuously – independent of the setting made on
operating line 123 – that is, 24 hours a day.
25
4
1
B
0
3
e
n
Release according to
operating line 123
Release 24 h
1
2
3
4
5
Mechanism of d.h.w. heating release
1 D.h.w.
button
2
Type of heating (hot water / electric immersion heater)
3
D.h.w. heating with hot water
4
D.h.w. heating with electric immersion heater
5 D.h.w.
heating
With all plant types x–5, d.h.w. heating is always released as long as it is switched on.
