Bedding
CAUTION
: Be sure the surfaces to be bedded are clean and dry.
1. Apply a 4mm (1/8") thick layer of marine sealant to the flange,
sidewall, and threads of the housing (see Figure 5). The sealant
must extend 12mm (1/2") higher than the combined thickness of
the hull, spacer, and hull nut. This will ensure there is marine
sealant in the threads to seal the hull and to hold the hull nut
securely in place.
Stainless steel housing in a metal hull
—To prevent electrolytic
corrosion, the stainless steel housing must be isolated from the
metal hull. Slide the isolation bushing onto the housing. Apply
additional marine
sealant to the surfaces of the bushing that will
contact the hull, filling any cavities in and around the bushing.
2. Apply a 4mm (1/8") thick layer of marine sealant to the entire
inside surface of the spacer. This will fill the gap between the
spacer and the sidewall of the transducer preventing vibration.
Installing
1. From outside the hull, thread the cable through the mounting
hole. Push the housing into the mounting hole using a twisting
motion to squeeze out excess sealant.
12° and 20° models
—From inside the hull, point the arrow on the
top of the transducer (and the cable exit) toward the KEEL or
centerline of the boat (see Figure 1). This will align the angle of the
element inside the transducer with the deadrise angle of your hull.
2. From inside the hull, slide one of the washers onto the housing
(see Figure 5). Slide the spacer onto the housing until the open
end rests against the washer. Add the remaining washer.
Be
sure a minimum of THREE threads are showing on the
housing above the washer
.
If not, make the spacer shorter by
cutting the
open end
(see Figure 6).
3. Screw the hull nut in place using slip-joint pliers.
Be sure a
minimum of ONE full thread is exposed above the hull nut
.
Cored fiberglass hull
—Do not over tighten, crushing the hull.
Wood hull
—Allow the wood to swell before tightening the hull nut.
4.
Secure the hull nut with the two set screws supplied
(see
Figure 7). Apply marine sealant to the threads of the set
screws. Using an Allen wrench, tighten each set screw until it
makes contact with the housing threads. Continue to tighten an
additional 1/8 to 1/4 turn. This will hold the hull nut firmly in
place.
Failure to do so may allow the hull nut to vibrate loose
.
5. Remove any excess marine sealant on the outside of the hull to
ensure smooth water flow under the transducer.
Cable Routing & Connecting
CAUTION
: If the 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 No. 33-035 and
follow the instructions supplied. Removing the waterproof
connector or cutting the cable, except when using a water-tight
junction box, will void the sensor 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. Use grommet(s) to prevent chafing. To reduce
electrical interference, separate the transducer cable from other
electrical wiring and the engine. Coil any excess cable and
secure it in place using cable ties to prevent damage.
2. Refer to the echosounder owner’s manual to connect the
transducer to the instrument.
Figure 6. Cutting the spacer
cut the
open end
only
Copyright © 2007 Airmar Technology Corp.
3
Figure 7. Tightening the two set screws
Copyright © 2008 - 2012 Airmar Technology Corp.
set screw
set screw
NOTE
: After screw
makes contact with
housing, tighten
additional 1/8 - 1/4
turn.
detail
(marine
(marine
marine sealant on threads, sidewall, and flange of housing
additional sealant on entire inside surface of spacer
Figure 5. Bedding and installing
Copyright © 2007 - 2009 Airmar Technology Corp.
solid fiberglass or wood hull
isolation
bushing
stainless steel housing in metal hull
NOTE
: There
must be a
minimum of
ONE fully
exposed thread
above the hull
to fill gap between spacer and sidewall
nut to hold it
firmly in place.
housing
hull nut
spacer
hull
set screw (2)
washer
washer
marine sealant on threads, sidewall, and flange of housing
isolation bushing where it contacts hull
additional sealant on entire inside surface of spacer
to fill gap between spacer and sidewall
sealant
in threads)
sealant
in threads)
spacer