Siemens LMV 5 Series, Technical Instructions, Page: 206 / 374

Technical Instructions LMV Series
Document No. LV5 ‐ 1000
Section 6 Page 34 SCC Inc.

If a combustion air temperature sensor is installed and activated, the air temperature will be
recorded when the last point is entered into the O
2
Control Curve. This temperature is stored under
the following menu path:
Params & Display > O2Contr/Alarm > Gas/Oil Settings > Startmode > Adjust. Temp O2
This is the temperature that will be compared against the current air temperature to perform
temperature compensated light ‐ off if parameter StartMode is set to “IgnLoadTC” or “IgnPtWithTC”
(LMV52.440 only).

When terminal X5 ‐ 03.2 is properly configured (see Section 3 ‐ Parameters), it can be energized to
cause a deactivation of the O
2
trim. When this is done, the LMV52 will operate on the O
2
Ratio
Control Curve. The O
2
rich and lean limits will be active as long as there is a valid O
2
signal. This
deactivation via X5 ‐ 03.2 occurs without a notification being displayed on the AZL52.

Pre ‐ purge must be set so that 20.9% (+/ ‐ 2.0% O
2
) is read by the QGO20 sensor. If this is not met, a
lockout or deactivation will occur depending on the setting of parameter OptgMode .

When using the LMV52.440 on low or ultra ‐ low NOx mesh burners, a StartMode of “IgnPtWithTC” is
typically used combined with adjusting O2InitOffset in the negative direction (more rich). If done
properly, this should make the transition from light ‐ off position to low fire richer than normal
operation so that the transition is stable and reliable under varying environmental conditions. While
the burner is being held at Point 2 awaiting NumberTauSuspend to expire, the O2InitOffset will
gradually dissolve and the %O
2
will be trimmed to setpoint before the burner is released to
modulate.

The AGO gas collector should be mounted per the requirements shown below:
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