Siemens QAA73.210 User Manual page 24

Note
Type of building
construction (BUILD)
Room influence
(AMBON)
Room influence
24 / 36
Siemens
Building Technologies
The following example shows how and according to which formula the room
temperature setpoint will be corrected.
Room temperature setpoint TRw
Correction factor
KORR
TRwk = TRw + (TRw - TRx)
2
TRwk = 20 °C + 4 (20 °C – 22 °C) = 12 °C
KORR Constant for room influence
TRx Actual value of the room temperature
TRw Room temperature setpoint
TRwk Room temperature setpoint (readjusted)
As the example shows, if the room temperature is 2 °C too high, the room influence
temporarily shifts the room temperature setpoint down to a level of 12 °C.
TRwk [°C]
30
25
20
15
10
5
5 15
10
KORR works only if the room temperature influence is activated.
Enables the control system's rate of response to be matched to the type of building
construction.
When the outside temperature varies, the room temperature changes at different
rates, depending on the building's thermal storage capacity.
The above setting ensures that the generation of the composite outside
temperature will be matched to the type of building construction. Also refer to
"Composite outside temperature".
5...10 Heavy building structures:
The room temperature will respond slower to outside temperature variations
1...5 Light building structures:
The room temperature will respond quicker to outside temperature variations
Owing to the temperature checkback signal received from the room, a constant
room temperature is maintained and, if required, quick setback enabled.
Room temperature deviation is the temperature differential between actual room
temperature and room temperature setpoint.
The setting will activate the room influence on the heating circuit.
Deviations of the actual room temperature from the setpoint are acquired and
taken into account by temperature control.
Room Unit for Boiler Control
Description of room unit settings
=
TRx =
KORR =
TRw
KORR=4
KORR=10
TRx
20 25
Actual room temperature
22 °C
8
°C
30
CE1U2283en
2015-09-16