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Siemens Building Technologies
Basic Documentation RVD110, RVD130
CE1P2381E
HVAC Products
11 Function block Space heating
27.05.2004
11
Function block Space heating
11.1 Operating
lines
Line
Function, parameter
Unit
Factory setting
Range
61
Heating limit (ECO)
K
–3
---
/ –10...+10
62
Building structure
1
0 / 1
63
Quick setback with room temperature sensor
1
0...15
66
Adaptation of heating curve
0
0 / 1
69
Heat gains
K
0
–2...+4
70
Room temperature influence (gain factor)
10
0...20
71
Parallel displacement of heating curve
K
0.0
–4.5...+4.5
72
Overrun time heating circuit pump
min
4
0...40
73
Frost protection for the plant
1
0 / 1
74
Max. limitation of room temperature
K
---
---
/ 0.5...4
Setting
---
means: Function is inactive; for additional setting notes, refer to the descriptions of the individual
functions
11.2 Compensating
variables
11.2.1 Outside
temperature
The RVD110 / RVD130 differentiate between 3 types of outside temperatures:
•
The actual outside temperature (T
A
)
•
The attenuated outside temperature (T
AD
): This temperature is generated by filtering
the actual outside temperature through the building time constant of 21 hours (fixed
value). This means that, compared to the actual outside temperature, the attenuated
outside temperature is considerably damped, thus representing the long-term devel-
opment of the outside temperature. The building time constant is a measure of the
type of building construction and an indication of how quickly the room temperature
in the building would change if the outside temperature suddenly changed. It can be
selected:
−
Heavy building structures: Setting 0 on operating line 62
−
Light building structures: Setting 1 on operating line 62
•
The composite outside temperature (T
AM
): This temperature is made up of the above
2 outside temperatures, depending on the type of building construction (can be se-
lected on operating line 62):
Building
construction
Entry on oper-
ating line 62
Proportion of actual
outside temperature (T
A
)
Proportion of attenuated
outside temperature (T
AD
)
Heavy
0
50 %
50 %
Light
1
75 %
25 %
Using these weightings, the composite outside temperature is less damped than the
attenuated outside temperature (T
AD
).
The composite outside temperature (T
AM
) 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 (with or without room tempera-
ture influence), the RVD110 / RVD130 use the composite outside temperature.
When operating line 25 is selected (display of the actual outside temperature) and but-
tons
and
are pressed simultaneously for about 3 seconds, both the attenuated
and the composite outside temperature adopt the current measured value. This means
that the generation of the 2 variables is restarted (outside temperature reset).
Tip
