Siemens RVA47.320 - Heating Circuit Values; Parallel Displacement of the Heating Curve; Room Influence

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Siemens Building Technologies Basic Documentation RVA47.320 CE1P2379E
HVAC Products Description of the heating engineer settings 15.07.2002
Heating circuit values
4.27 Parallel displacement of the heating curve
• Adjustment of controller's temperature scale to the actual plant conditions.
Produces a parallel displacement of the heating curve in order to achieve a better
match of room temperature setpoints and actual room temperatures.
1. Press the operating line selection buttons to select operating line 100.
2. Press the + / – buttons to set the parallel displacement..
Setting range Unit Factory setting
-4.5...+4.5 °C (K) 0.0
By changing the value entered, all room temperature setpoints will be appropriately
raised or lowered. This allows the room temperature setpoints to be matched to the
effective room temperatures.
If a nominal room temperature setpoint of 20 °C adjusted on the controller always
produces a room temperature of 22 °C (independent of the prevailing outside
temperature), displace the heating curve downward by 2 °C.
Each setpoint readjustment, be it by changing the setting value or the operational level,
corresponds to a parallel displacement of the heating curve.
20 10 0 -10 -20
-30
90
80
70
60
50
40
30
°C
°C
2406D02
100
0
10
10
0
30
T
R
w
TA
TV
TV Flow temperature
TA Composite outside temperature
TRw Room temperature setpoint
4.28 Room influence
• More accurate room temperature control due to temperature checkback signal from
the space
• Use of heat gains
• Possibility of boost heating and quick setback
Benefit
Description
Setting
Effect
Example:
Parallel displacement
Benefit