Siemens AVS75.39 Series User Manual page 154

Boiler temperature
control
154 / 239
Siemens
Building Technologies
Modulating 3-position, Modulating UX
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 burner stage 2.
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 DHW separation circuit are handled analogous to 2-stage
burner operation.
TKx [°C]
TKw+SDK
TKw+1/2 SDK
1K
TKw
1K
TKw-1/2 SDK
a)
GSt
Mod
d) c)
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
User manual RVS43.345
The settings in detail
b)
a)
d) d)
t [h]
CE1U2354en_021
2013-09-02