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Siemens Building Technologies
HVAC Products
• Setting 3:
B71 / U1 acts as a scalable DC 0...10 V input to receive the heat demand signals
from other devices
11.2.3 Circulating pump
The circulating pump is to be configured on operating line 54.
0 = no circulating pump present
1 = the circulating pump feeds water into the storage tank; this takes place only when
d.h.w. heating is activated
2 = the circulating pump feeds water into the heat exchanger's secondary return,
whereby 80 % of the heat losses will be compensated for
3 = the circulating pump feeds water into the heat exchanger's secondary return,
whereby 100 % of the heat losses will be compensated for
When using setting 2 or 3, the circulating pump runs during the whole period of time
d.h.w heating is released. (also refer to subsection 16.3.6 "Compensation of heat los-
ses through control ".
11.2.4 Input H5
Terminal H5 of the RVD240 is a digital input. It offers the following choices (settings on
operating line 55):
0 = No function
1 = reception of pulses
with plant type 1–x, the mode of operation of the pulse input must be defined on
operating line 56:
1 = acting only on heating circuit 1
2 = acting only on heating circuit 2
3 = acting on both heating circuits
With the other plant types, the function always acts on 2-port valve Y1 in the pri-
mary return.
For more detailed information, refer to chapter 27 "Function block Various func-
tions " (operating lines 181 through 183).
2 = reception of heat demand signals
for more information, refer to chapter 13 "Function block Valve actuator of heat
converter"
3 = input for alarm signals:
it is possible to receive error messages in the form of pulses. Operating line 50
displays them with error code 171; they can be passed on via LPB or M-bus
4 = input for flow switch:
to improve the control performance, it is possible to fit an optional flow switch in the
d.h.w. circuit of several types of plant.
The unit connected to H5 must have gold-plated contacts; if AC 230 V has passed
through such contacts, they cannot be used again.
11.2.5 Control of variable speed pump
The RVD240 features a pulse-width-modulated output that is used for the control of a
variable speed pump. Based on the temperature conditions, the controller calculates
the ideal speed of the pump. The speed-controlled pump is to be selected on operating
line 57. This can be:
Setting
Terminal
Used as:
0
–
None
1
Q1
Heating circuit pump in heating circuit 1
2
Q2
Heating circuit pump in heating circuit 2
Basic documentation RVD240
11 Function block Plant configuration
CE1P2384en
27.05.2004
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