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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
5.50 Constant for quick setback and optimum start
control (KON)
•
Making use of the building’s thermal storage capacity.
The type of quick setback or optimum start control is dependent on whether or not a
room sensor is used. A differentiation is made between quick setback with and without
room temperature sensor.
This setting is active only if
no
room sensor is used.
Setting range
Unit
Factory setting
0...20 –
2
The duration of quick setback or optimum start control will be changed.
Entry:
Increase:
Setback time will become longer
For well insulated buildings that cool down slowly
Decrease:
Setback time will become shorter
For poorly insulated buildings that cool down rather quickly
Quick setback is started as soon as a change to a lower room temperature setpoint
takes place (e.g. switching times in automatic mode).
The heating circuit pump will be deactivated until the quick setback time has elapsed,
which is generated from setting 702
EXP
, the composite outside temperature and the
room temperature setpoint change.
The quick setback time is limited to a maximum of 15 hours.
The example applies to a setpoint step change of 4 °C (e.g. TRw from 20 to 16 °C):
TAgem Setting
702
EXP
0 4 8 12 15 20
- 20
0
0
0
0
0
0
- 10
0
0.5
1
1.5
2
2.5
0
0
3
6
9
11
15
+10
0
5
11
15 (16.5) 15 (21)
15 (27)
Values in hours
If a room temperature sensor is connected, the quick setback time will not be generated
from this setting. For details, refer to section "Quick setback with room temperature
sensor“ (Chapter 6, “General control processes”).
For a description of optimum start control, refer to operating line 727.
Benefit
Description
Important
Setting
Effect
Quick setback without
room temperature
sensor
Example
Note
Optimum start control
without room temperature
sensor
