INSTALLATION, OPERATING &
MAINTENANCE INSTRUCTIONS FOR 797 &
798 SERIES PIPE INSERT HEATERS
GENERAL
HEATREX
Pipe
Insert
Heaters
are
designed
to
provide
years
of
trouble
free
operation
if
properly
installed
and
maintained.
Please
read
and
follow
these
instructions
for
installing
and
maintaining
the
heater.
1
Pipe
Insert
Heaters
provide
an
effective
way
to
heat
large
storage
tanks.
The
heating
element
design
allows
removal
and
servicing
of
the
heating
element
without
draining
the
tank.
HEATER
CONSTRUCTION
The
heating
elements
are
open
coil
design
and
consist
of
heavy
gauge
nickel
‐
chromium
alloy
supported
by
ceramic
insulators.
The
ceramic
insulators
are
fastened
to
a
strip
of
heavy
sheet
metal.
PIPE
/
TUBE
CONSTRUCTION
The
heaters
shall
be
installed
in
a
tube
or
pipe
of
sufficient
wall
thickness
to
prevent
the
tube
from
distorting
from
the
heat
generated.
The
tubes
shall
be
constructed
so
that
the
heating
elements
may
be
removed
without
draining
the
tank.
When
specified,
HEATREX
can
provide
heater
pipes
(798
series).
For
additional
product
offerings,
refer
to
HEATREX
catalog
literature
on
Process
Heating
such
as
Circulation
Heaters,
Immersion
Heaters,
or
Tubular
Heating
Elements.
Refer
to
HX87
‐
2000
‐
83
for
Industrial
Control
Panel
IOM.
A
variety
of
designs,
sizes,
and
mounting
configurations
are
available.
The
heater
watt
density
and
design
features
must
be
closely
matched
to
the
application.
Life
of
the
heating
element
is
directly
related
to
its
surface
temperature.
Temperature
regulating
devices,
temperature
limiting
controls,
and
low
liquid
level
controls
are
recommended
for
use
with
pipe
insert
heaters,
to
control
the
heating
process
and
safeguard
the
heater
from
excessive
temperatures
that
can
cause
damage.
Also,
damage
to
fluid
could
occur
if
the
heater
is
allowed
to
exceed
the
maximum
film
temperature
recommended
by
the
manufacturer.
Heaters
can
be
provided
with
sheath
sensing
thermocouples
when
requested.
HEATREX
Pipe
Insert
Heaters
can
be
specially
designed
for
use
in
hazardous
areas
as
specified
in
Article
500
through
516
of
the
National
Electrical
Code.
Refer
to
the
heater
nameplate
or
HEATREX
Application
Data
for
classification
of
the
heater
provided.
See
section
below
labeled
Hazardous
Areas
for
specific
requirements.
It
is
the
ultimate
responsibility
of
the
user
to
verify
that
the
construction
materials
provided
by
HEATREX
are
suitable
for
use
with
the
process
fluid.
Specifically,
corrosion
issues
must
be
reviewed.
Refer
to
HEATREX
Application
Data
for
heater
construction
materials
and
design
conditions
.
INSTALLATION
Handling
and
Storage
Care
must
be
taken
to
avoid
damage
to
the
heater
during
storage
and
handling.
When
HEATREX
provides
heaters
with
pipes,
the
heating
element
is
shipped
in
the
pipe.
If
the
heater
pipe
is
user
supplied,
the
heating
element
will
be
shipped
in
cardboard
shipping
tubes.
CAUTION
Failure
to
follow
HEATREX
recommendations
could
result
in
premature
failure
and/or
serious
equipment
damage.
CAUTION
HEATREX
recommends
installation
be
performed
by
qualified
personnel
familiar
with
the
National
Electrical
Code
and
all
local
codes
and
standards.
It
is
the
responsibility
of
the
installer
to
verify
the
safety
and
suitability
of
the
installation
WARNING
DO
NOT
mount
heaters
in
an
atmosphere
containing
combustible
gases,
vapors,
dusts,
or
fibers
unless
properly
marked
as
suitable
for
the
condition.
Refer
to
section
below
for
special
instructions
for
Hazardous
Areas.
Protect
the
heater
from
weather
damage
during
storage.
Cardboard
shipping
tubes
are
not
suitable
for
outdoor
storage.
It
is
recommended
to
store
the
heater
in
a
cool
dry
area
to
help
prevent
the
heating
element
ceramic
spacers
from
drawing
moisture.
WARNING
Hazardous
voltages
are
present
in
this
equipment.
Lock
out
and
tag
the
branch
circuit
disconnect
switch
before
working
on
this
heater
.
