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Siemens
Heating and D.h.w. Controller RVL481
CE1P2541en
Building Technologies
16 Function block "Basic settings d.h.w."
20.05.2008
vides heating to the NORMAL temperature according to its heating program (independ-
ent of the operating mode) and is not in holiday mode.
The circulating pump runs with a forward shift against the times of the heating program;
this means it is affected by optimum start control.
With plant types 4–x, 5–x, and 6–x and the setting of “0” (own controller) on operating
line 121, the circulating pump never runs since these plant types have no own heating
program.
2 examples are given below to show the behavior of the circulating pump when control-
lers A, B, C and D are interconnected via data bus:
Operating line
121 122
Con-
trollers
Operating
mode
Heating program, holidays Circulating
pump
A
06:00…18:00
B
07:00…23:00
C
07:00…22:00
2 1
D
03:00…22:00, HOLIDAYS
The circulat-
ing pump
runs from
06:00:00 to
23:00
Example 2
Operating line
121 122
Con-
trollers
Operating
mode
Heating program, holidays Circulating
pump
A
06:00:00..0.18:00, opti-
mum start control shifts
forward by 2 hours
B
08:00…23:00
C
07:00…22:00
2 1
D
05:00…21:00
The circulat-
ing pump
runs from
04:00:00 to
23:00
16.3.2 Operation
of
circulating pump during the holiday period
During the holiday period, the circulating pump runs according to the setting made, as
shown in the following table:
Operating
line 121
Operating
line 122
Operation of circulating pump
0
0, 1, 2, or 3
Circulating pump OFF, if own controller in
holiday mode
1
0, 1, 2, or 3
Circulating pump OFF, if all controllers having
the same segment number are in holiday
mode
2
0, 1, 2, or 3
Circulating pump OFF, if all controllers in the
interconnected system are in holiday mode
Example 1
