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QAA 73.110 6. Funktionen
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Einschaltung
Steigt der um den Raumtemperatur-Einfluss korrigierte Vorlauftem-
peratur-Sollwert höher als der Raumtemperatur-Sollwert plus ein
Korrektursollwert, dann wird die Heizung eingeschaltet.
Einschaltpunkt der Heizung:
16
KORR
10
S
4TRw TVwk +
Legende:
Kürzel Bedeutung
KORR Raumtemperatur-Einflussfaktor Zeile 102
TVwk
Vorlauftemperatur-Sollwert korrigiert um den Raum-
temperatur
TRw Raumtemperatur-Sollwert
S Heizkennlinien Steilheit
6.4 Schnellabsenkung mit
Raumtemperatur-Einfluss
Die Wärmespeicherfähigkeit eines Gebäudes wird nach dem Um-
schalten auf einen tieferen Sollwert ausgenutzt.
Die hier beschriebene Schnellabsenkung wirkt nur auf jene Heiz-
kreise, wo ein Raumtemperatur-Einfluss wirksam ist.
Prozess
Die Schnellabsenkung startet, sobald auf einen tieferen Raumtem-
peratur-Sollwert umgeschaltet wird (z.B. Schaltzeiten bei Automa-
tikbetrieb).
Wenn sich der Raumtemperatur-Istwert bis auf den Raumtempera-
tur-Sollwert abgesenkt hat (TRx = TRw), ist die Schnellabsenkung
abgelaufen.
20
15
°C
t
TRx
2284d01
TRw
ON
OFF
H
t
Abb. 27:
77


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