Function Block Space Heating; Operating Lines; Compensating Variables; Outside Temperature - Siemens RVD230 Basic Documentation

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Siemens Building Technologies
HVAC Products
12

Function block Space heating

12.1

Operating lines

Line Function, parameter
61 Heating limit (ECO)
62 Building time constant
70 Effect of the room temperature (gain factor)
71 Parallel displacement of the heating curve
72 Overrun time heating circuit or system pump
73 Maximum limitation of room temperature
74 Optimization with / without room temperature sensor
75 Maximum heating up time
76 Maximum early shutdown
77 Maximum rate of flow temperature increase
78 Quick setback
12.2

Compensating variables

12.2.1 Outside temperature

The RVD230 makes use of 3 types of outside temperatures:
• The actual outside temperature (T
• The composite outside temperature (T
temperature by the building time constant. The proportion of the actual outside tem-
perature is 50 %.
The composite outside temperature suppresses unnecessary reactions of the control
system if the outside temperature changes for short periods of time.
In the case of the weather-compensated types of control (without or with room tem-
perature influence), the RVD230 uses the composite outside temperature.
The building time constant is a measure of the type of building construction and indi-
cates how quickly the room temperature would change if the outside temperature sud-
denly changed. The building time constant can be adjusted:
Type of building construction
Light
Medium
Heavy
•
The attenuated outside temperature (T
outside temperature by the building time constant. This means that, compared with the
actual outside temperature, the attenuated outside temperature is considerably damp-
ened. This ensures that no heating will take place in the summer when, under normal
circumstances, the heating would be switched on because the outside temperature
drops for a few days
If operating line 25 is selected (display of the actual room temperature) and the 2 but-
tons and are pressed simultaneously for about 3 seconds, the attenuated and
the composite outside temperature will generate the current measured value; the gen-
eration of these 2 variables will then start anew (outside temperature reset).
Basic Documentation RVD230
12 Function block Space heating
Unit
K
h
K
min
K
h
h
°C/h
)
A
). It is generated by filtering the actual outside
AM
Recommended building time constant
10 h
20 h
50 h
). It is generated by filtering twice the actual
AD
Factory Range
setting
–3 --- / –10...+10
20 0...50
10 0...20
0.0 –15.0...+15.0
4 0...40
--- --- / 0.5...4
0 0 / 1
0:00 0:00...42:00
0:00 0:00...6:00
--- --- / 1...600
1 0 / 1
41/130
CE1P2383en
27.05.2004