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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 9 Function block: Space heating 15.03.2011
the summer when – because the outside temperature drops for a few days – the
heating would normally be switched on
T
A
(B9 rsp. BUS)
2522B02
T
A
k
t
k
t
T
AD
T
AM
Generation of composite and attenuated outside temperature
T
A
Current outside temperature T
AM
Composite outside temperature
T
AD
Attenuated outside temperature k
t
Building time constant
0
5
10
15
20
25
T
AD
T
AM
t
2522D17
T
A
T
A
Progression of current, composite and attenuated outside temperature
T
A
Current outside temperature T
AM
Composite outside temperature
T
AD
Attenuated outside temperature t Time
9.2.2 Heating limits
2 heating limits can be set:
"ECO day" for NORMAL heating
"ECO night" for the lower temperature level. This can be REDUCED heating or
OFF (holiday/protection mode)
In both cases, the heating limit is the outside temperature at which the heating shall
be switched on or off. The switching differential is 1 °C.
9.2.3 Mode of operation
The heating is switched off when one of the 3 following conditions is satisfied:
The current outside temperature exceeds the current ECO heating limit
The composite outside temperature exceeds the current ECO heating limit
The attenuated outside temperature exceeds the "ECO day" heating limit
In all these cases, the assumption is made that the amount of heat entering the
building from outside, or the amount of heat stored in the building structure, is suffi-
cient to maintain the required room temperature level.
When the automatic ECO function switches the heating off, the display shows
ECO.
Switching the
heating off
31


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