Siemens RVL471 - Generation of Setpoint; Weather-Compensated Control; Demand-Compensated Control

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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 10 Function block "Space heating" 23.10.2002
10.7 Generation of setpoint
10.7.1 Weather-compensated control
Weather-compensated control is used with plant types 1−x, 2−x and 3−x. The setpoint is
generated via the heating curve as a function of the outside temperature. The tem-
perature used is the composite outside temperature.
Composite outside
temperature
Knob on
room unit *
Heating curve
Knob on
controller
Flow temperature
setpoint T
Vw
Setpoint on
operating line 165
Parallel displacement of
heating curve, operating line 72
LPB
SYNERGYR
OZW30
Room setpoint
or
s
1 + s
20 °C
Operating line
1, 2 or 3
1 + s
2524B01e
LPB Data bus
OZW30 SYNERGYR central unit
s Slope
* Active only with room unit level
The impact of the central unit OZW30 is described in section “27.1.4 Combination with
SYNERGYR central unit OZW30 described.
10.7.2 Demand-compensated control
Demand-compensated control is used with plant types 4−x, 5−x, and 6−x.
The setpoint is delivered to the RVL471 via the data bus (LPB) in the form of a heat
demand signal. In that case, the outside temperature will not be taken into considera-
tion.