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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 14 Function block: D.h.w. 15.03.2011
14 Function block: D.h.w.
This function block is used for making all d.h.w.-related settings.
14.1 Operating lines
Line Function, parameter Factory setting (range) Unit
121* Assignment of d.h.w. 0 (0...2)
123 Release of d.h.w. heating 2 (0...2)
124 D.h.w. priority 0 (0...4)
126
D.h.w. storage tank sensor/thermostat
0 (0…5)
127 Boost d.h.w. charging temperature 10 (0...50) K
128 Switching differential d.h.w. 8 (1...20) K
129 Maximum time d.h.w. charging 60 (--- / 5...250) min
130 Setpoint legionella function --- (--- / 20...100) °C
131 Forced charging 0 (0 / 1)
* Operating line 121 is only available with RVP350
14.2 Assignment of d.h.w. heating
Operating line 121 is used to select the heating circuits for which d.h.w. is heated,
that is, the heating circuits that draw their water from the same source.
Op. line 121 Comments
0 D.h.w. heating only for heating circuit of own controller
1 D.h.w. is only provided for the heating circuits of the controllers
with the same segment number connected to the data bus (LPB)
2 D.h.w. is provided for all heating circuits of the controllers con-
nected to the data bus (LPB)
The setting is required in connection with operating lines 141 (program for the cir-
culating pump) and 123 (release of d.h.w. heating).
14.3 Program for the circulating pump
Refer to chapter 15.2.4 "Circulating pump"
14.4 Frost protection for d.h.w.
Frost protection for the controller’s d.h.w storage tank is ensured by sensor B31
and – if installed – sensor B32.
For the storage tank, a minimum switch-on temperature of 5 °C always applies. If
the temperature acquired by sensor B31 or B32 falls below 5 °C, charging is im-
mediately started (independent of other settings), generating a heat request to the
precontroller. The switch-off temperature is 5 °C plus the switching differential (set
on operating line 128).
When using thermostats, frost protection for the d.h.w. storage tank is not
provided.
Caution!
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