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Siemens Building Technologies Basic Documentation RVD110, RVD130 CE1P2381E
HVAC Products 14 Function block D.h.w. heating 27.05.2004
B1
Y1
Y7
B7
Q1
A6
B9
B71
Q7
2381S09
N1
M
A6 Room unit
B1 Flow temperature sensor
B7 Primary return temperature sensor
B71 D.h.w. temperature sensor
B9 Outside sensor
N1 Controller
Q1 Heating circuit pump
Q7 D.h.w. circulating pump
Y1 2-port valve for control of the heating circuit
Y7 2-port valve with electrothermal actuator for the d.h.w. circuit
14.5.2 Mode of operation
2-port valve Y7 in the d.h.w. circuit has an electrothermal actuator which is controlled
by control output Q3 / Y7. Control outputs Y5 and Y6 are not used.
The d.h.w. temperature is acquired by sensor B71. This means that maximum limitation
of the differential temperature in the heating circuit is not possible.
No thermostat may be used.
Sensor input B3 will not be used. The respective fault status message must be sup-
pressed by connecting a fixed resistor (recommendation: 1000 Ω) to terminals B3-M.
This does not affect control output Q3 / Y7 and the frost protection function.
14.5.3 Settings
For this application, the following settings are of importance:
Operating
line
Function, parameter Setting Explanation
51 Plant type no. 6
55 Return from the d.h.w. circulating
pump
Any Control outputs Y5 / Y6
and Q3 are not used
106 D.h.w. priority Any
107 Pump overrun time
Must be 0
111 Actuator opening time Any
Control outputs Y5 / Y6
112 Actuator closing time Any
are not used
113 P-band of control Any
114 Integral action time of control Any
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