Siemens LMV5 Series Technical Instructions page 187

LMV Series
* NOTE: When probing the fuel rich limit, it is not recommended to exceed 200 PPM CO (dry basis)
or less than 1.0% O (wet or dry basis) for any point. When probing the fuel lean limit, it is not
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recommended to exceed 200 PPM CO or adversely affect flame stability for any point.
NOTE: The %O values read and displayed by the LMV52 system are always on a wet basis (%O
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wet). Most if not all external exhaust gas analyzers read and display %O
basis (%O dry). All O
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The external exhaust gas analyzer is used to read CO, NOx, and also serves as a way to double
check the %O wet values. Figure 6‐11 gives the approximate relationship between %O
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%O dry.
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4. Make sure that the QGO20 O
temperature. This gives the Zirconium cell time to heat‐soak and also to burn off any
contaminants. The temperature of the cell can be checked if desired through the following
menu path:
Params & Display > O2 Module > Process Data > QGO SensorTemp
5. With the burner off (Phase 12), set the fuel rich limit (O2 Alarm value) for each point. This can
be done with the burner off since these values have already been found and recorded during
Ratio Control Curve commissioning (see above). Once into the O2 Alarm curve, simply enter in
the recorded value for each point and save each point. To access the O2 Alarm curve, use the
following menu path:
Params & Display > O2 Contr/Alarm > Gas Settings > O2 Alarm > O2 Alarm
6. With the burner off (Phase 12), set the fuel lean limit (O2 MaxValue) based on the values that
have already been found and recorded for Point 1 and Point 10 during Ratio Control Curve
commissioning (see above). To set the fuel lean limit, use the following menu path:
Params & Display > O2 Contr/Alarm > Gas Settings > O2 Alarm > O2 MaxValue
7. The target %O (recorded above) will be used for the O
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points should be set to the target %O
8. When it is safe to do so and when there is adequate load available, start the burner / boiler and
let it warm up to operating temperature.
9. Access the O Ratio Control Curve and the O
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Params & Display > O2 Contr/Alarm > Gas Settings > O2 Control
10. Once the O Control Curve is entered, Point 2 should be displayed. Pressing Enter again should
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drive the burner to Point 2 if it is not already there. When the burner is driving to Point 2, a
carat (>) will be displayed. Once the burner is at Point 2, a colon (:) will be displayed. If the aux
3 actuator is used for FGR and FGR‐Mode is not set for "Aux3onCurve", a pound (#) indicates the
aux 3 actuator has not released to the curve.
SCC Inc.
curves must be commissioned using %O
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sensor has been activated for at least 2 hours and is up to
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within a band of (+0.2 / ‐0.0).
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wet values as read by the LMV52.
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Control Curve. The O
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Control Curve using the following menu path:
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Technical Instructions
Document No. LV5‐1000
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and other gases on a dry
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wet and
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Control Curve
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Section 6