Siemens Building Technologies
Basic Documentation RVL470
CE1P2522E / 30.03.2000
Landis & Staefa Division
Function block "Space heating"
27/68
8.6.4. 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 end-user and covers a maximum range of –4.5...+4.5 °C room
temperature
•
Manually on operating line 72
This parallel displacement of the heating curve is calculated as follows:
Parallel displacement
∆
T
Flow
= (
∆
T
Knob
+
∆
T
Operating line 72
)
*
( 1 + s )
Parallel displacement of the heating curve
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
s
Slope
T
A
Outside temperature
T
V
Flow temperature
T
WR
Room temperature setpoint
8.6.5. Display of setpoints
Two 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, resulting flow temperature setpoint at an outside temperature of +15 °C
•
TV2, resulting flow temperature setpoint at an outside temperature of –5 °C
These two current setpoints determine the actual heating curve from which – in function
of the composite outside temperature – the current flow temperature setpoint is gener-
ated. It can be called up on operating line 165 (also refer to section "13. Function block
"Service functions and general settings"").
