Function Block "Basic Settings D.h.w; Operating Lines; Assignment Of D.h.w. Heating; Program For The Circulating Pump - Siemens RVL481 Basic Documentation

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16 Function block "Basic settings
d.h.w."
Function block "Basic settings d.h.w." is used to select the heating circuits for which
the d.h.w. is heated and according to which program the d.h.w. circulating pump shall
operate.
16.1

Operating lines

Line Function, parameter
121

Assignment of d.h.w. heating

122

Program for the circulating pump

16.2 Assignment of d.h.w. heating
Operating line 121 is used to select for which heating circuits the d.h.w. is heated, that
is, which heating circuits draw their water from the same source.
Operating line 121 Explanation
0 D.h.w. heating is only provided for the heating circuit associated
with the own controller.
With plant types 4–x, 5–x, and 6–x, this setting makes no sense
since no own heating circuit exists (no d.h.w. in that case).
1 D.h.w. heating is only provided for the heating circuits of the con-
trollers with the same segment number that are connected to
the data bus (LPB).
D.h.w. heating is provided for all heating circuits of the controllers
2
connected to the data bus (LPB).
The setting is required in connection with operating lines 122 (circulating pump pro-
gram) and 123 (release of d.h.w. heating).
16.3 Program for the circulating pump

16.3.1 General mode of operation

On operating line 122, it is possible to enter according to which time program the d.h.w.
circulating program shall operate. The use of a circulating pump is optional with all
types of plant.
With d.h.w. plant type x–4 "Instantaneous d.h.w. heating via heat exchanger", it
is strongly recommended to use a circulating pump, the reason being better
control performance.
That circulating pump runs only when d.h.w. heating is switched on (button
The circulating pump runs at the following times, depending on the setting made on
operating line 122:
Operating line 122 The circulating pump runs
Continuously (24 hours a day)
0
According to one or several heating programs
1
According to switching program 2 of own controller
2
According to switching program 3 of own controller
3
With setting 1, operation of the circulating pump depends on the setting made on oper-
ating line 121. In an interconnected plant with several controllers, that is, with several
heating programs, the circulating pump runs when at least one of the controllers pro-
Heating and D.h.w. Controller RVL481

16 Function block "Basic settings d.h.w."

Factory setting (range) Unit
0 (0...2)
2 (0...3)
is lit).
CE1P2541en
20.05.2008