Humminbird XTH 9 DB 74 P Guide D'installation page 2

PLASTIC THRU-HULL TRANSDUCER Installation Guide PLASTIC THRU-HULL TRANSDUCER Installation Guide
6. After confirming proper operation, power off the control head, and unplug the transducer
cable connector from the control head.
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| Determine the Transducer Mounting Position
Consider the following to find the best mounting location for the transducer.
WARNING! Do NOT install the transducer in line with the engine intake.
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The best mounting location for the transducer is aft midship, as close to the centerline of the
boat as possible.
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Make sure nothing is in front, behind, or to the side of the transducer that is closer than 12"
(30.5 cm). The transducer should be mounted forward of the propellers on inboard boats, and
separated adequately from other transducers, strakes, rivet lines, or other protrusions on the
boat.
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Deadrise: The transducer, when mounted, must be parallel with the waterline. If the selected
mounting location has a hull deadrise of 8 degrees or greater, the included leveling block should
be used to level the transducer housing and direct the sonar signal straight down.
Inside the Boat : There must be room to access the mounting location for installation and cable
routing. If you need to use the leveling block, make sure the inside surface of the hull is smooth
enough to seat the leveling block securely.
Installation
Before installing your transducer, review the following installation scenarios:
Δ For a standard installation, where there are no major obstructions and the deadrise is less
than 8 degrees, use the included leveling block (uncut), and mount it inside the hull (Standard
Installation).
Δ For an installation that needs to minimize the impact of a small obstruction, but where the
deadrise is less than 8 degrees, use the included leveling block (uncut), and mount it outside
the hull (Standard Installation).
Δ For an installation where the deadrise is more than 8 degrees, use the included leveling block,
cut at the appropriate angle, to compensate for the deadrise (Alternate Installation).
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| Drill the Hole and Prepare the Leveling Block
Follow the instructions below for the installation type that matches your hull and deadrise.
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 fairing 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 technician.
Standard Installation (Flat Hull, Deadrise less than 8°):
For an installation that needs to minimize the impact of a small obstruction, but where the deadrise
is less than 8 degrees, use the included leveling block (uncut), and mount it outside the hull.
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Determining the Transducer
Mounting Position
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flat hull
Determining the Deadrise
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