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Building Technologies Division CC1N7550en
Industry Sector 24.05.2011
Function of LMV52... with O2 trim control
The LMV52... system is an extended LMV51... system. A special feature of the
LMV52… is control of the residual oxygen content, aimed at increasing boiler efficiency.
In addition to the features of the LMV51..., the LMV52... provides O2 trim control, con-
trol of a maximum of 6 actuators, control of a VSD, and acquisition of cumulated fuel
consumption and current fuel throughput. The LMV52... system uses an O2 sensor
(QGO20...), an external O2 module, and the standard components of the LMV51... sys-
tem.
The PLL... O2 module is a detached measuring module for use with the QGO20... sen-
sor with a connection facility for 2 temperature sensors (Pt1000 / LG-Ni 1000). With the
help of the temperature sensors (flue gas and combustion air temperature), the com-
bustion performance can be determined, depending on the type of fuel. The module
communicates via CAN bus with the LMV52... basic unit. The O2 module is to be lo-
cated near the QGO... (<10 m) to keep the impact on sensitive sensor lines as low as
possible. To power the sensor’s heating element, the O2 module needs its own mains
connection.
Combustion air
temperature detector
O2 module
PLL...
QGO20...
CAN
LMV52...
Flue gas
temperature detector
General
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