
GDS-68XP Operation & Maintenance Manual, Revision 3.5
Page 19
AC
HEATER
(OPTIONAL)
The
200
watt
AC
‐
powered
heater
is
recommended
for
outdoor
applications
where
ambient
temperatures
may
fall
below
freezing
for
extended
periods
of
time.
The
heater
is
available
in
either
110VAC
or
230VAC
models.
Access
to
the
heater
wiring
is
via
a
separate
¾”
NPT
fitting
on
the
bottom
of
the
heater
junction
box.
Note
that
all
high
voltage
AC
wiring
must
be
kept
separate
from
lower
voltage
DC
and
signal
lines.
Figure 5-5: 200W AC Heater Wiring
Local
codes
and
good
wiring
practice
require
an
AC
shutoff
switch
within
sight
of
the
heater
assembly
for
maintenance
and
testing.
IMPORTANT:
Keep
all
electrical
fittings
tight
while
circuits
are
alive.
PURGE
AIR
INLET
Purge
air
should
be
drawn
from
a
source
of
ambient
air
that
is
clean
and
free
of
significant
levels
of
hydrogen
sulfide
or
similar
toxic
gas.
GDS
Corp
recommends
placing
the
Purge
Air
inlet
some
distance
from
the
GDS
‐
68XP,
in
a
location
that
is
free
from
background
gas
and
protected
from
heavy
rains,
water
spray
and
snow
or
ice.
Included
with
the
unit
is
a
¼”
screen
fitting
that
must
be
placed
over
the
open
end
of
the
purge
air
inlet
to
keep
dust,
dirt,
water
droplets
and
insects
from
entering
the
tubing
and
being
drawn
into
the
purge
air
pump.
AC
HOT
Access
to
heater
wiring
via
¾”
NPT
fitting
on
bottom
of
junction
box
(enclosure
cutout
not
provided)
Heater
Element
Fixed
Thermostat
(ON
below
50°F
/
10°C)
AC
NEUTRAL
AC
GND
Thermostat
Heater
Element
Black
Green
Red/White