Technical
Instructions
SKPx5.xxxUx
Electro
Ͳ
hydraulic
actuators
Document
Number
CC1N7643us
December
10,
2018
Page
20
Siemens
AG
Building
Technologies
Start
Ͳ
up
continued
SKP75.xxxUx
The
pressure
ratio
and
bias
adjustment
screws
are
located
on
top
of
the
regulator
under
a
sealable
cover
plate.
The
actual
settings
can
be
seen
through
windows
on
each
side
of
the
regulator.
)
NOTE:
The
burner
capacity
is
controlled
by
the
position
of
the
air
damper.
The
combustion
quality
(air/gas
ratio)
is
controlled
by
the
settings
on
the
regular
(the
+
and
Ͳ
indications
relate
to
the
change
in
gas
flow).
Adjustment
in
clockwise
direction
decreases
the
gas
flow.
1.
Set
the
air/gas
ratio
to
the
desired
value
using
adjusting
screw
1
(coarse
setting).
2.
Start
the
burner
and
run
it
at
approximately
90%
of
full
capacity.
3.
Measure
CO2
or
O2
content
in
the
flue
gases
and
correct
the
ratio
by
adjusting
screw
1
until
optimum
values
are
obtained
(fine
setting).
4.
Return
to
low
fire
position
and
measure
the
CO2
or
O2
content
in
the
flue
gases.
If
necessary,
correct
the
setting
by
adjusting
screw
2
(Figure
7)
until
optimum
values
are
obtained.
5.
Limit
the
damper
position
for
low
fire
operation.
If
considerable
bias
adjustment
was
necessary
to
achieve
optimum
combustion,
repeat
the
procedure
from
step
3.
6.
Run
the
burner
to
the
required
high
fire
position
and
limit
the
air
damper
position.
7.
Check
flue
gas
values
at
several
intermediate
output
levels.
If
corrections
are
necessary,
note
the
following:
•
Adjust
the
pressure
ratio
screw
1
at
high
operation
only.
•
Adjust
the
bias
screw
2
at
low
fire
operation
only.
If
the
air
pressure
exceeds
the
maximum
value
of
12"
or
20"
w.c.
(see
Specifications
),
the
pressure
must
be
reduced
with
a
pressure
reducing
T
Ͳ
fitting
(AGA78).
P
G
1
P
A
76
43d16/
0916
2
Figure
10.
SKP75.xxxUx
Adjustments
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