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Siemens Heating and D.h.w. Controller RVL481 CE1P2541en
Building Technologies 21 Function block "Derivative action time d.h.w. heating via heat exchanger" 20.05.2008
21 Function block "Derivative action time
d.h.w. heating via heat exchanger"
With plant types x–4, this function block permits entry of the D-part with d.h.w. control.
21.1 Operating line
Line Function, parameter Factory setting (range) Unit
137 Derivative action time of control (Tv) 16 (0…255) s
21.2 Description
The 3-position controller provides PID mode. The derivative action time Tv (D-part) can
be set on operating line 137.
A deviation of the flow temperature from the setpoint is offset by incremental adjust-
ment of the 2-port valve. The ideal runtime of the actuator is 10…35 seconds.
In the case of d.h.w. heating via heat exchanger, it is best to set operating lines
133…137 as follows:
Operating line Parameter Setting value
133 Actuator opening time 35 s
134 Actuator closing time 35 s
135 P-band of control (Xp) 35 °C
136 Integral action time of control (Tn) 35 s
137 Derivative action time of control (Tv) 16 s
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