Technical
Instructions
LMV
Series
Document
No.
LV5
‐
1000
Section
6
Page
14
SCC
Inc.
Suggested
O
2
Trim
Commissioning
‐
Premix
Mesh
Burner
or
Nozzle
Mixing
Burner
with
High
Percentage
of
FGR
(Typically
LMV52.440)
1.
The
commissioning
procedure
assumes
the
following:
a.
All
Pre
‐
Requisites
for
an
LMV52
system
with
O
2
trim
(and
VSD
if
equipped)
have
been
met
according
to
Section
4
of
this
literature.
b.
The
Ratio
Control
Curves
have
been
commissioned
according
to
Section
4
of
this
literature.
c.
Section
6
of
this
literature
has
been
read
and
understood
up
to
this
point.
d.
If
a
start
mode
with
combustion
air
temperature
compensation
will
be
used,
the
air
temperature
sensor
must
be
installed
and
activated.
2.
As
was
the
case
for
the
Ratio
Control
Curves
in
Section
4,
the
same
free
spreadsheet
can
also
be
used
to
assist
in
the
commissioning
of
the
O
2
trim.
This
spreadsheet
graphically
illustrates
the
O
2
curves
as
well
as
provides
an
orderly
way
to
record
the
details
of
how
the
burner
was
set
up.
Figure
6
‐
3:
LMVx
Curves
Spreadsheet
3.
The
key
to
commissioning
the
O
2
curves
quickly
and
easily
is
contained
in
the
Ratio
Control
Curves.
Specifically,
the
following
must
be
achieved
for
each
point
on
the
Ratio
Control
Curves
(as
paraphrased
from
Section
4
of
this
literature):
a.
Safe
combustion
as
verified
by
a
calibrated
stack
gas
analyzer
b.
The
%
load
matching
the
fuel
flow
within
+/
‐
3%
c.
Emissions
compliance
d.
Smooth
Ratio
Control
Curves
(no
sharp
peaks
or
valleys)
e.
VSD
speed
should
increase
with
load
in
a
linear
fashion
(if
equipped)
f.
Determine
the
%O
2
wet
corresponding
to
the
fuel
rich
limit
(O
2
Alarm
value)
for
each
point.
Probing
may
or
may
not
be
possible
depending
on
the
burner
design.
Also,
follow
burner
OEM
recommendations.
Most
mesh
burner
elements
can
be
damaged
if
run
too
fuel
rich.*
g.
Find
and
record
the
%O
2
wet
corresponding
to
the
fuel
lean
limit
(
O2
MaxValue
)
for
Point
1
and
Point
10
by
probing
or
according
to
burner
OEM
recommendations.*
h.
Find
the
target
%O
2
.
For
these
burners
the
target
%O
2
for
each
point
will
be
the
%O
2
wet
corresponding
to
emissions
compliance
(typically
CO,
NOx).
After
the
target
%O
2
is
found,
increase
the
%O
2
and
leave
the
point
at
least
0.5%
O
2
leaner
than
the
target
%O
2
.
Record
this
as
the
"saved"
value
for
each
curve
point.
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