Siemens RVA53.242 - Page 84

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
4.27.3 Modulating burner
The functioning and activation and deactivation of the first stage corresponds to that of
2-stage burner operation. Release of modulation is analogous to the release of the
second burner stage.
Deactivation or locking of modulation takes place at the same time the change from the
first burner stage to cycling occurs.
Maximum limitation of the boiler temperature, minimum burner running time, cascade
operation and d.h.w. separation circuit are handled analogous to 2-stage burner
operation.
TKw
TKw-1/2 SDK
TKw+1/2 SDK
TKw+SDK
TKx [°C]
t [h]
1K
1K
GSt
Mod
a)
b)
a)
c) d) d)d)
2373Z58
Release integral for boiler sequence
a) Release integral modulation (release integral second stage “2-stage burner”)
b) Reset integral modulation (reset integral second stage “2-stage burner”)
c) Neutral zone
d) On / off pulses
GSt Basic stage
Mod Modulating stage
SDK Switching differential boiler
TKw Boiler temperature setpoint
Boiler temperature
control