Cut-leveling
blocks
Hull
Apply Marine Adhesive
Sealant to all mating surfaces
1"
Minimum
thickness
Alternate Installation
(Deadrise greater than 2
°
)
Shows transducer close enough to center line so
that the hull will not interfere with side imaging
Alternate Installation (Deadrise more than 2
°
):
For an installation where the deadrise is more than 2 degrees, use
the included leveling block, cut at the appropriate angle, to compensate for the deadrise.
1. From the outside of the hull, drill a small pilot hole (smaller than the centering bit of your drill bit or hole saw),
at the mounting location you selected in section 2. Drill the hole perpendicular to the waterline.
2. Use the pilot hole (from the outside of the hull) to drill a 1 1/8" hole that is sized to fit the threaded stem of
the transducer. Drill the hole perpendicular to the waterline.
3. Thoroughly clean and deburr the drilled hole and clean the outside of the hull.
4. If the hull angle is greater than 2 degrees, cut the included leveling block and use both pieces to level the
transducer. The block should be cut to match the angle of the deadrise of the hull.
• Cut the leveling block into two equal pieces: one which mounts outside the hull and is shaped to
match the profile of the transducer, and one which mounts inside the hull and provides a level surface
for the fasteners.
• The thinnest wall of the outside leveling block must be at least 1".
• The leveling block included with your transducer can accommodate a maximum deadrise angle of 25
degrees.
5. The leveling block will be installed (cut) on the inside and outside of the hull. Proceed to
Section 4: Attaching
the Transducer
.
4.
Attaching the Transducer
1. Feed the transducer cable through the drilled hole, then temporarily install the transducer to check the fit.
2. Apply a generous amount of marine-grade silicone sealant or slow-curing epoxy inside the drilled hole and along
the mating surfaces of the transducer housing and leveling block.
3. See the illustrations that correspond to your installation type and transducer orientation.
• Insert the transducer into the drilled hole from outside the boat with the leveling block(s) installed
according to your installation type, then install the nut onto the threaded stem from inside the boat.
Hand tighten the nut ONLY until the assembly is firmly seated, then tighten NO MORE than 1/8 of a
turn extra.
CAUTION:
To avoid damage, do not overtighten the nut.
• Make sure that the narrow (thin) end of the transducer is pointing forward.
NOTE:
This type of transducer is directional in nature and must be aligned with the front of the boat (the direction of
travel) and parallel to the center line. Failure to align the transducer properly will result in incorrect bottom readings
and incorrect fish locations. (See Illustration for orientation).
4. Remove the excess adhesive sealant from the outside of the hull to ensure smooth water flow over the
transducer.
Plastic Thru-Hull Side Imaging Transducer
3
531392-2_B
Side Imaging:
The side imaging transducer has some special requirements because of its side viewing capabilities.
• The side imaging transducer must not have anything obstructing the ”view” of the side looking beams, i.e.
nothing can be in the line of sight of these beams (not a hull, motor, or other transducer, etc).
• In order for the side beams to be displayed accurately, the transducer must be mounted so that it is looking
straight down in the water when the boat is in the water.
NOTE:
Rough seas can also affect the reading of the side imaging transducer.
Installation scenarios for consideration:
•
Flat Hull, One Transducer:
Locate a flat area on the bottom of the hull, forward of where the propeller shaft
comes out of the hull. Make sure there is nothing lower than this location to the right or left.
•
V-shaped Hull, Two Transducers:
Install two thru-hull side imaging transducers, one on each side of the V.
Connect the transducers with AS SI LR Y cable.
•
Two Back Engines, Two Transducers:
Install two thru-hull side imaging transducers outboard from the dual
engines. Connect the transducers with AS SI LR Y cable.
NOTE:
AS SI LR Y and additional Side Imaging Thru-Hull Transducers must be purchased separately. Also, if the included
transducer will not work for your application, you may exchange it, NEW and UNASSEMBLED, with mounting hardware
included, for a transducer appropriate for your application - often at very little or no charge depending on the transducer.
See the FAQ (Frequently Asked Questions) section of our Web site at
humminbird.com
or call our Customer Resource
Center at
1-800-633-1468
.
3.
Drilling the Hole and Installing the Leveling Block
Follow the instructions below for the installation type that matches your hull and deadrise.
Standard Installation (Flat Hull, Deadrise less than 2
°
):
For an installation that needs to minimize the impact of a
small obstruction, but where the deadrise is less than 1 - 2 degrees, use the included leveling block (uncut), and
mount it outside the hull.
1. From the outside of the hull, drill a small pilot hole (smaller than the centering bit of your drill bit or hole saw), at
the mounting location you selected in section 2. Drill the hole perpendicular to the hull.
2. Use the pilot hole (from the outside of the hull) to drill a 1 1/8" hole that is sized to fit the threaded stem of
the transducer. Drill the hole perpendicular to the hull.
3. Thoroughly clean and deburr the drilled hole and clean the outside of the hull.
4. The leveling block will be installed (uncut) on the outside of the hull. Proceed to
Section 4: Attaching the
Transducer
.
CAUTION:
Use only the leveling block included with this transducer. Do NOT use a wooden leveling block, as any
swelling of the wood might cause the plastic on the transducer to shatter.
NOTE:
A separately-purchased leveling block can also be used to create a hydrodynamic waterflow around the
transducer body. The design and fabrication of this block varies greatly with different hull shapes; therefore, it should
be customized by a qualified marine technician.
NOTE:
Replacement leveling blocks are available from Humminbird®. For assistance, contact the Humminbird®
Customer Resource Center at
humminbird.com
or call
1-800-633-1468
.
Plastic Thru-Hull Side Imaging Transducer
2
531392-2_B
Side Imaging
Shows transducer not close to center line, so that
the hull may interfere with side imaging
5.
Routing the Cable
The transducer cable must be routed to the point where the control head is mounted.
NOTE:
Your boat may have a pre-existing wiring channel or conduit that you can use for the transducer cable.
1. Unplug the other end of the transducer cable from the control head.
CAUTION!
Do not cut or shorten the transducer cable, and try not to damage the cable insulation. Route the cable as far
as possible from any VHF radio antenna cables or tachometer cables to reduce the possibility of interference. If the cable is
too short, extension cables are available to extend the transducer cable up to a total of 50'. For assistance, contact the
Customer Resource Center at
humminbird.com
or call
1-800-633-1468
for more information.
CAUTION!
Do NOT mount the cables where the connectors could be submerged in water or flooded. If cables are installed
in a splash-prone area, it may be helpful to apply dielectric grease to the inside of the connectors to prevent corrosion.
Dielectric grease can be purchased separately from a general hardware or automotive store.
2. Route and secure the cable, avoiding areas where it may be damaged or interfere with normal boating
operations.
6.
Connecting the Cable
Insert the transducer cable into the appropriate terminal slot. The cable connectors are labeled, and there are
corresponding labels on the cable holder on the rear of the control head. The slots are keyed to prevent reversed
installation, so be careful not to force the connector into the holder.
Your control head is now ready for operation.
Plastic Thru-Hull Side Imaging Transducer
4
531392-2_B
Flat Hull, One Transducer
Leveling block
(uncut)
Hull
Standard Installation (Flat Hull)
Apply Marine Adhesive
Sealant to all mating surfaces
V-shaped Hull, Two Transducers
OR
Two Back In-Board Engines,
Two Transducers
Correct Orientation of Transducer
Plastic_Thru-Hull_SI_Install_531392-2_B.qxp:530758-3_B 11/8/12 12:47 PM Page 2
