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Building Technologies Division User Manual LMV5... CC1A7550.5en
COx supervision and control 07.07.2015
4.5.2 COx Control operating mode
This operating mode is only implemented for modulating operation.
The function is not available in multi-stage oil operation.
In addition, the O2 trim control function must be activated (O2 trim controller operating
modes: O2 Control or conAutoDeac).
This operating mode is activated by setting the OptgMode COx parameter to COx
Control.
Parameter Gas: OptgMode COx (deactivated / COx Alarm / COx Control)
Oil: OptgMode COx (deactivated / COx Alarm / COx Control)
In addition to COx supervision, the O2 value (an air supply) is then increased by means
of the O2 trim control function if a COx signal is present during operation.
This is not a conventional COx control (with a COx setpoint, actual value, and control
difference), but instead is an O2 trim control effect in relation to the COx value.
COx supervision takes place in the same way as in the COx Alarm operating mode.
Phases of COx control:
The COx controller is active in the operating phases (60, 62).
COx control is released at the same time as O2 trim control.
Value of the O2 increase:
The O2ModOffset parameter for the relevant fuel is used to specify how much the O2
value increases.
This is the same parameter as the one already used to increase the O2 value in the
case of fast load changes (see chapter Increasing the manipulated variable in case of
fast load changes in the LMV5 Basic Documentation (P7550)).
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