SKPx5.xxxUx
Electro
Ͳ
hydraulic
actuators
Technical
Instructions
Document
Number
CC1N7643us
December
10,
2018
Siemens
AG
Building
Technologies
Page
15
Installation
continued
SKP55.xxxUx
The
pressure
connection
pipes
should
be
as
short
as
possible
to
allow
the
regulator
to
react
to
sudden
changes.
In
cases
where
it
is
not
possible
to
install
an
orifice
in
the
air
line,
(e.g.,
lack
of
available
air
pressure)
the
SKP55.xxxUx
actuator
may
be
connected
to
the
air
pressure
upstream
of
the
burner
and
the
combustion
chamber
pressure,
using
the
pressure
differential
across
the
burner
orifice.
This
arrangement
is
not
applicable
to
installations
utilizing
combustion
air
preheating
systems.
SKP25.xxxUx
Depending
on
the
application
and
applicable
installation
regulations,
measures
to
detect
and
avoid
a
downstream
overpressure
situation
might
be
required.
To
avoid
excessive
gas
pressure
downstream
of
the
regulator
SKP25.xxxUx,
a
maximum
pressure
switch
shall
be
used
to
switch
off
the
SKP25.xxxUx/VGxxx.xxxUx.
The
downstream
gas
pressure
and
the
gas
flow
will
consequently
be
shut
off.
The
gas
release
downstream
SKP25.xxxUx/VGxxx.xxxUx
will
be
limited
to
the
period
for
overpressure
detection
and
shut
off.
Depending
on
the
upstream
gas
pressure,
vent
limiters
AGA25.2
or
AGA25.3
may
need
to
be
installed
into
the
connection
marked
AIR/VENT
on
the
SKPx5.
More
specific
information
about
applying
the
AGA25
can
be
found
in
the
"Accessories"
section.
If
required
(due
to
even
higher
upstream
gas
pressures)
a
1/4"
Rp
vent
line
can
be
connected
with
or
without
the
AGA25
vent
limiter
installed.
76
43
z88
/111
8
SKP25.xxxUx
AGA25.2
AGA25.3
Figure
6.
SKP25.xxxUx
Connection
for
venting
and
installation
of
the
AGA25.2/AGA25.3
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