46/118
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
25
2
2
D
1
0
100
0
10
10
0
30
T
Rw
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"").
