Siemens LMV 5 Series, Technical Instructions, Page: 123 / 374

LMV Series Technical Instructions
Document No. LV5 ‐ 1000
SCC Inc. Page 5 Section 4
6. LMV52 / VFD combination must be “Standardized” before operation. See Section 5 (VSD) for
more details.
a. Verify that the air damper opens to pre ‐ purge position before the blower is energized
for standardization.
Pre ‐ Requisites for LMV52 Systems with O2 Trim
1. All prerequisites of the Basic LMV51 system apply.
2. The O
2
sensor must be mounted correctly. See Appendix B (LMV5 Accessories Guide) for more
details. Particular attention should be paid to the following:
a. If the O
2
sensor cannot be installed per Appendix B (LMV5 Accessories Guide), contact
SCC for assistance.
b. The QGO20 O
2
sensor is not suited for most types of biogas or fuels that produce ash,
such as #6 oil. Contact SCC for advice on the compatibility of uncommon fuels.
3. The O
2
sensor must be wired to the PLL52 correctly. See Section 2 (Wiring) for more details.
Particular attention should be paid to the following:
a. The PLL52 module must be within 30 feet of the O
2
sensor.
b. Two conduits must be run between the QGO20 O
2
sensor and the PLL52 module. One
conduit must contain the low voltage signals while the other conduit must contain the
high voltage for the sensor heater.
4. The furnace pressure of the boiler being commissioned must be repeatable at a given firing rate.
Repeatability of +/ ‐ 0.2 in WC at each firing rate is adequate.
5. A fuel flow meter or some means of determining the load (firing rate) to +/ ‐ 3% is required. A
more accurate load number (+/ ‐ 3%) for each curve point is necessary for reliable O
2
trim
functionality.
6. The LMV52 must be powered and configured for the QGO20 O
2
sensor for two hours prior to
commissioning. This is done to let the QGO20 sensor heat up thoroughly.
7. The boiler must be up to normal operating temperature / pressure for at least one hour before
commissioning the O
2
trim.
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