Section-1 Introduction
October 28, 2013
1
‐
20
Copyright
©2013,
Harris
Broadcast
WARNING:
Disconnect
primary
power
prior
to
servicing.
888
‐
2720
‐
001
Figure 1-13 Cooling Intake/Exhaust
Note
Consult the data sheets in this section of the manual for details of cooling requirements for each FAX
model.
In
general,
transmitter
cooling
systems
fall
into
two
categories:
An
open
system
in
which
the
heated
transmitter
exhaust
passes
through
a
dedicated
duct
to
the
outside
of
the
transmitter
building.
The
transmitter
may
receive
fresh
outside
air
directly
through
a
separate
intake
duct
or
may
receive
ambient
air
from
the
transmitter
hall,
with
the
transmitter
hall
being
supplied
make
‐
up
air
from
outside
via
a
filtered
inlet
vent.
With
an
open
system,
it
is
imperative
to
correctly
balance
the
input
and
output
air
flow
volumes,
paying
particular
attention
to
the
pressure
drops
in
external
ducts
and
providing
external
blowers
to
overcome
these
losses
and
ensure
correct
air
flow.
The
Flexiva
transmitter
internal
air
system
is
designed
to
supply
sufficient
air
at
the
required
static
pressure
to
cool
the
transmitter
only
and
all
external
duct
losses
must
be
compensated
for
by
external
blowers
(this
includes
the
optional
intake
plenum).
Outside
air
containing
salt
or
pollution
must
have
those
items
removed
by
an
adequate
filtration
system,
and
any
pressure
drops
caused
by
filtration
must
also
be
considered.
A
closed
system
in
which
the
transmitter
exhausts
and
inputs
air
directly
to
and
from
the
transmitter
room.
The
transmitter
room
is
closed
to
outside
air
and
makes
use
of
air
conditioning
units
to
remove
the
resulting
heat
buildup.
This
type
of
system
is
recommended
in
geographic
areas
with
especially
salty,
sulfuric,
or
otherwise
polluted
air.
With
a
closed
system,
it
is
imperative
to
correctly
balance
the
heat
load.
That
is,
to
size
and
position
the
air
conditioning
units
properly
to
handle
the
heat
generated
by
the
transmitter,
ancillary
equipment,
building
lighting,
and
even
solar
radiation
entering
through
windows.
In
may
also
be
desirable
to
oversize
the
air
conditioning
system
to
include
the
heat
dissipated
by
the
station
test
load,
when
in
operation.
Figures
for
both
the
transmitter
heat
load
and
air
flow
volume
are
provided
in
the
transmitter
Outline
Drawing
843
‐
5614
‐
103
.
Consult
a
professional
heating
and
ventilation
expert
in
your
area
for
help
in
designing
the
building
cooling
system.
When
the
installation
is
to
be
made
at
a
high
altitude,
it
will
be
necessary
to
derate
the
upper
temperature
range.
The
Harris
Broadcast
transmitter
is
rated
to
operate
from
0°
to
+45°C
at
sea
level.
The
upper
temperature
range
must
be
derated
by
2°C
per
300
meters
(1000
feet)
above
sea
level.
Summary of Contents for Flexiva FAX 5KW
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