Siemens RVL471 - Parallel Displacement of Heating Curve; Display of Setpoints

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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 10 Function block "Space heating" 23.10.2002
10.6.4 Parallel displacement of heating curve
The heating curve can be displaced parallel:
• Manually with the setting knob for room temperature readjustments. The readjustment
can be made by the enduser and covers a maximum range of −4.5...+4.5 °C room
temperature
• Manually on operating line 72
The parallel displacement of the heating curve is calculated as follows:
Parallel displacement ∆T
Flow
= ( ∆T
Knob
+ ∆T
operating line 72
)
*
( 1 + s )
20
10 0 -10 -20
-30
90
80
70
60
50
40
30
2522D10
100
0
10
10
0
30
T
R
w
T
A
T
V
Parallel displacement of heating curve
s Slope
TA Outside temperature
TV Flow temperature
TRw Room temperature setpoint
10.6.5 Display of setpoints
2 current setpoints result from the basic setting, the position of the setting knob and - if
made - the entry on operating line 72, which can be called up on operating line 166:
• TV1, resultant flow temperature setpoint at an outside temperature of +15 °C
• TV2, resultant flow temperature setpoint at an outside temperature of
−5 °C
These 2 current setpoints determine the actual heating curve from which – as a func-
tion of the composite outside temperature – the current flow temperature setpoint is
generated. It can be called up on operating line 165 (also refer to chapter “25 Function
block "Service functions and general settings"").