Function Block Space Heating; Operating Lines; Compensating Variables; Outside Temperature - Siemens RVD110 Basic Documentation

Tip
32/94
Siemens Building Technologies
HVAC Products
11

Function block Space heating

11.1

Operating lines

Line Function, parameter
61 Heating limit (ECO)
62 Building structure
63 Quick setback with room temperature sensor
66 Adaptation of heating curve
69 Heat gains
70 Room temperature influence (gain factor)
71 Parallel displacement of heating curve
72 Overrun time heating circuit pump
73 Frost protection for the plant
74 Max. limitation of room temperature
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
• The attenuated outside temperature (T
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
2 outside temperatures, depending on the type of building construction (can be se-
lected on operating line 62):
Building Entry on oper-
construction ating line 62
Heavy
Light
Using these weightings, the composite outside temperature is less damped than the
attenuated outside temperature (T
The composite outside temperature (T
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).
Basic Documentation RVD110, RVD130
11 Function block Space heating
)
A
): This temperature is generated by filtering
AD
): This temperature is made up of the above
AM
Proportion of actual
outside temperature (T
0 50 %
1 75 %
).
AD
) suppresses unnecessary reactions of the
AM
Unit Factory setting
K –3 --- / –10...+10
1
1
0
K 0
10
K 0.0
min 4
1
K ---
Proportion of attenuated
) outside temperature (T
A
50 %
25 %
Range
0 / 1
0...15
0 / 1
–2...+4
0...20
–4.5...+4.5
0...40
0 / 1
--- / 0.5...4
)
AD
CE1P2381E
27.05.2004