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Siemens
Heating and D.h.w. Controller RVL481
CE1P2541en
Building Technologies
10 Function block "Space heating"
20.05.2008
circumstances, the heating would be switched on because the outside temperature
drops for a few days
T
A
(B9 rsp. BUS)
252
2B
02
T
A
k
t
k
t
T
AD
T
AM
Generation of the composite and attenuated outside temperature
T
A
Actual outside temperature
T
AD
Attenuated outside temperature
T
AM
Composite outside temperature
k
t
Building time constant
0
5
10
15
20
25
T
AD
T
AM
t
25
2
2
D1
7
T
A
T
A
Progression of the actual, composite and attenuated outside temperature
T
A
Actual outside temperature
T
AD
Attenuated outside temperature
T
AM
The composite outside temperature
t Time
10.2.2 Heating
limits
The following heating limits can be set:
•
"ECO day" for NORMAL heating
•
"ECO night" for the lower temperature level. This can be REDUCED heating or OFF
(holidays / frost protection)
In both cases, the heating limit is the outside temperature at which the heating shall be
switched on and off. The switching differential is 1 °C.
10.2.3 Mode of operation
The heating will be switched off when
one
of the 3 following conditions is satisfied:
•
The actual 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, it is assumed that the amount of heat entering the building envelope
from outside or the amount of heat stored in the building structure will be sufficient to
maintain the required room temperature level.
When the ECO function has switched the heating off, the display shows
ECO.
Switching the heating off
