Siemens LMV 5 Series, Technical Instructions, Page: 180 / 374

Technical Instructions LMV Series
Document No. LV5 ‐ 1000
Section 6 Page 8 SCC Inc.
NOTE: Both sensors are required to do a boiler efficiency calculation. The boiler efficiency
calculation is not required for O
2
trim operation. If sensors are activated but not reading correctly
or not wired correctly, the O
2
trim will not activate. Burner inlet temperature must be read to
perform a temperature ‐ compensated startup on the LMV52.440.
4. Set the appropriate actuators to “air influen” (air influenced). These are typically only the actuators
/ VSD that will directly influence the burner air rate. The menu path for these parameters is:
Params & Display > RatioControl > Gas Settings
Typically, only the air actuator and the VSD (if used) are set to air influenced. If used, the FGR
actuator is usually not set to air influenced.
5. Set the operating mode of the O
2
system to “man deact” (manually deactivated). This is necessary
for the O
2
system curves to be commissioned. The menu path for this parameter is:
Params & Display > O2Contr/Alarm > Gas Settings > OptgMode = man deact
6. Set the curve point at which the low fire delay time will be measured. This is typically set to Point 2,
unless oversized exhaust stacks with high turndown burners are encountered, which may make gas
velocity in the stack too low at low fire. For these applications, setting this parameter to a higher
point than Point 2 will increase the gas velocity past the O
2
sensor and yield a more responsive O
2
reading. This can be set through the following menu path:
Params & Display > O2Contr/Alarm> Gas Settings > Control Param > LowfireAdaptPtNo
7. Set the load value at which the O
2
trim will disengage. Typically, this is set to the load value for
Point 2 on the Fuel ‐ Air Ratio Control Curve. The exception to this is if parameter LowfireAdaptPtNo
is set to a point other than Point 2. If this is the case, set this for the load value that corresponds to
the point set by LowfireAdaptPtNo . This can be set through the following menu path:
Params & Display > O2Contr/Alarm > Gas Settings > Control Param > O2 CtrlThreshold
8. Set the desired type of pre ‐ control. For most natural gas burners where the gap between O
2
curves
is large enough that the Lambda Factor can be learned (see O
2
Control and O
2
Alarm Curves in Figure
6 ‐ 2), this should be set to "like P air". The "like theory" setting is typically used for oil burners, and
"LambdaFact1" should only be used as a last resort. The menu path for setting the type of pre ‐
control is:
Params & Display > O2Contr/Alarm > Gas Settings > Control Param > Type Air Change
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