Screw the cap nut several turns, then check that the insert’s
arrow is still facing forward toward the bow. Continue to tighten
the cap nut.
Hand-tighten
only. Do not
over tighten.
Warning
: Always attach the safety wire to prevent the insert
from backing out in the unlikely event that the cap nut fails or is
screwed on incorrectly.
Attach the safety wire to one eye in the hull nut. Lead the wire in
a counterclockwise direction and thread it through one eye in the
cap nut. Twist the end securely to the wire (see Figure 2).
Cable Routing & Connecting
Caution
: If your transducer came with a connector, DO NOT
remove it to ease cable routing. If the cable must be cut and
spliced, use Airmar’s splash-proof Junction Box 33-035 and follow
the instructions provided. Cutting the cable or removing the
connector, except when using Airmar’s junction box, will void the
transducer warranty.
1. Route the cable to the instrument,
being careful
not to tear the
cable jacket when passing it through the bulkhead(s) and other
parts of the boat. To reduce electrical interference, separate the
transducer cable from other electrical wiring and the engine.
Coil any excess cable and secure it in place with zip-ties to
prevent damage.
2. Refer to the instrument owner’s manual to connect the
transducer to the instrument.
Checking for Leaks
Warning
: Never install a thru-hull transducer and leave the boat in
the water unchecked for several days.
When the boat is placed in the water,
immediately
check around
the thru-hull transducer for leaks. Note that very small leaks may
not be readily observed. It is best not to leave the boat in the
water for more than 3 hours before checking it again. If there is a
small leak, there may be considerable bilge water accumulation
after 24 hours. If a leak is observed, repeat “Bedding” and
“Installing”
immediately
(see page 2).
Antifouling Paint
Surfaces exposed to salt water
must
be coated with antifouling
paint. Use
water-based
antifouling paint only.
Never
use ketone
based antifouling paint, since ketones can attack many plastics
possibly damaging the transducer. Reapply antifouling paint every
6 months or at the beginning of each boating season.
Retractable models only
—Also paint the outside wall of the
insert and the blanking plug below the lower O-ring. Paint the bore
of the housing up 30mm (1-1/4").
Installation in a Cored Fiberglass Hull
The core (wood or foam)
must
be cut and sealed carefully. The
core
must
be protected from water seepage, and the hull
must
be
reinforced to prevent it from crushing under the hull nut allowing
the housing to become loose.
Warning
: Always wear safety goggles and a dust mask.
1. Drill a 3mm or 1/8" pilot hole from inside the hull. If there is a rib,
strut, or other hull irregularity near the selected mounting location,
drill from the outside. (If the hole is drilled in the wrong location,
drill a second hole in a better location. Apply masking tape to the
outside of the hull over the incorrect hole and fill it with epoxy.)
3
Figure 2. Bedding and installing—
low profile models shown
P6 or P7
P8
hul
l
hull nu
t
hull
safety wire
cap nut
hull nut
sealant on lip
insert
housing
housing
arrow
arrow
notch
washer
and side wall
large
O-ring
detail
key
small
O-ring
Figure 3. Retractable insert
notch
(some installations)
AIRMAR
®
AIRMAR
®
