31/106
Siemens
Basic Documentation RVP360
CE1P2546en
Building Technologies
9 Function block: Space heating
2017-07-24
9
Function block: Space heating
This function block performs the automatic ECO function, the optimization
functions with boost heating and quick setback, plus room influence.
9.1 Operating
lines
Line Function, parameter
Factory setting
(range)
Unit
Heating
circuit
61 NORMAL heating limit (ECO day)
17.0 (--.- / 5...25)
°C
1, 2
62 REDUCED heating limit (ECO night)
5.0 (--.- / –5...25)
°C
1, 2
63 Building time constant
20 (0...50)
h
1+2
64 Quick
setback
1 (0 / 1)
1, 2
65 Room temperature source
A (0...3, A)
1, 2
66 Type of optimization
0 (0 / 1)
1, 2
67 Maximum heating up period
00:00 (00:00...42:00)
h
1, 2
68 Maximum early shutdown
0:00 (0:00...6:00)
h
1, 2
69 Maximum limitation room temperature
--.- (--.- / 0...35)
°C
1, 2
70 Influence of room temperature (gain factor)
4 (0...20)
1, 2
71 Boost of room temperature setpoint on boost heating
5 (0...20)
°C
1, 2
9.2 Automatic ECO function
The automatic ECO function controls space heating depending on demand. It gives
consideration to the progression of the room temperature depending on the type of
building structure as the outside temperature varies. If the amount of heat stored in
the house or building is sufficient to maintain the room temperature setpoint cur-
rently required, the heating is switched off.
The automatic ECO function ensures that the heating system operates only, or us-
es energy only, when indeed required.
9.2.1 Compensating and auxiliary variables
The compensating and auxiliary variables considered by the automatic ECO func-
tion are the progression of the outside temperature and the heat storage capacity
of the building.
The following variables are taken into account:
The building time constant: This is a measure of the type of building structure
and indicates how quickly the room temperature would vary if the outside tem-
perature suddenly changed. The following guide values can be used for setting
the building time constant: 10 hours for light, 25 hours for medium, and 50 hours
for heavy building structures
The current outside temperature (T
A
)
The composite outside temperature (T
AM
). It is the mean value of …
the current outside temperature,
the outside temperature filtered by the building time constant.
Compared with the current outside temperature, the composite outside tempera-
ture is attenuated. Hence, it represents the impact of short-time outside tempera-
ture variations on the room temperature as they often occur during intermediate
seasons (spring and autumn)
The attenuated outside temperature (T
AD
): It is generated by double-filtering the
current outside temperature by the building time constant. This means that – in
comparison with the current outside temperature – the attenuated outside tem-
perature is considerably dampened. This ensures that no heating is provided in
