Additional Tips For Commissioning - Siemens LMV5 Series Technical Instructions

Technical Instructions
Document No. LV5‐1000
Additional Tips for Commissioning

If an LMV52 is being commissioned, activate the O
sensor is heated, this will show a fast responding O
Control Curve commissioning. This sensor reads %O
than an external flue gas analyzer.

Using a fuel flow meter (temporary or permanent) for commissioning is always a good idea even
for LMV51's without O
the PID loop in any load control will work much better. A temporary, insertion type of flow
meter is available from SCC Inc. for this purpose.

If burner head pressure must be used as a last resort to estimate firing rate, bear in mind that
head pressure does not increase with gas flow in a linear manner. There is a square root
relationship between the differential pressure across the burner head and the gas flow. This
relationship is very similar to how the pressure varies across a fixed orifice with an increase or
decrease in flow. Also, furnace pressure must be accounted for by hooking up both sides of the
manometer, one side to the burner head pressure and one side to the furnace pressure.

Carbon Monoxide (CO) is produced when combustion is incomplete, typically due to the flame
being too rich or too lean. CO is potentially explosive when mixed with air in the right
proportions. For CO to be explosive in air, it must reach a concentration of at least 12.5%
(125,000 ppm) with an ignition source present.

If a burner is commissioned properly, actuator curves should increase smoothly with increasing
load (firing rate). One exception to this would be the FGR actuator (Aux1 or Aux3) which
commonly decreases (closes) as firing rate increases. Curves should always be smooth, with no
sharp corners.

The best and fastest method to commission a burner with an LMV5 is to set up a small table
where the technician can have his laptop, AZL, fuel flow meter and external flue gas analyzer all
within arm's reach. This allows the curve points to be input rapidly and accurately. If the
information is entered in the laptop point by point, a very nice start‐up report will also be
generated.

The ACS450 software is not as fast as using the AZL to commission the LMV5. Since this is the
case, the ACS450 is typically not used to commission the LMV5. However, the ACS450 is very
valuable when used to download an .mdb file (all parameter settings, fault and lockout history,
in English) and also when used to download .par files (the machine‐language parameter set from
the LMV5). It is recommended to download both of these files after commissioning, so that
there is a backup record of all parameter and curve settings.

To go back out of the menu and check burner operation, press the < and > buttons at the same
time. This will take the cursor to Normal Operation, so the normal operation screen can be
viewed by pressing Enter. This can be done anywhere in the menu as long as a single parameter
is not currently displayed. Pressing Esc will take the cursor back in to where it was in the menu.
Section 4
trim. If the fuel input (heat output) increases linearly with firing rate,
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sensor as soon as possible. Once the O
2
value on the AZL screen during Ratio
2
wet so the value will be somewhat lower
2
LMV Series
2
SCC Inc.