Airmar P39 TRIDUCER® Multisensor - Manual (Page 2)

Installation
Attaching the Transducer to the Bracket
1. Insert the transducer’s pivot posts into the slots in the back of the
bracket (see Figure 3).
2. With the screw holes aligned, rotate the transducer until it
snaps onto the bracket.
Hole Drilling
CAUTION: To prevent drilling too deeply, wrap masking tape
around the bit 22mm (7/8") from the point.
NOTE: Fiberglass hull—Minimize surface cracking by running
the drill in reverse until the gelcoat is penetrated.
1. At the selected location position the transducer, so it projects
3mm (1/8") below the bottom edge of the transom (see Figure 4).
2. Be sure the bottom of the transducer is parallel to the waterline.
Using a pencil, trace the bottom of the bracket and both corners
onto the hull.
3. Remove the transducer and hold the shim against the outline
you have drawn. Mark the screw holes with an “X” in the center
of each slot.
4. Using a 4mm, #23, or 9/64" drill bit, drill two holes 22mm (7/8")
deep at the locations indicated.
Compensating for Transom Angle: Shim
For the best performance, the transducer beam must be aimed
straight at the bottom. Since the transom of most boats is angled,
the bracket must compensate for it. Measure the transom angle of
the boat with an angle finder.
• Standard transom (13° transom angle)—The bracket is
designed for a standard 13° transom angle. The shim is not
needed for this installation. Skip to “Mounting the Bracket”.
• Stepped transom and jet boats (3° transom angle) —Use the
shim with the taper down. Place the nuts in the slots in the back
of the bracket (see Figure 5). Snap the shim into place.
• Small aluminum and fiberglass boats (20° transom angle)—
Use the shim with the taper up (see Figure 5). Place the nuts in
the slots in the back of the bracket. Snap the shim into place.
• If you are unsure about using the shim—Experiment with the
shim by following the instructions “Mounting the Bracket” and
“Checking the Transducer Angle and Projection.”
Mounting the Bracket
1. Insert the two, lock nuts in the slots in the back of the bracket if
this has not been done (see Figure 5).
2. Apply marine sealant to the threads of the two, #10 x 1-3/4",
self-tapping screws to prevent water seepage into the transom.
3. Screw the bracket (with the shim if needed) to the hull.
Do not tighten the screws at this time.
Checking the Transducer Angle & Projection
CAUTION: Do not position the leading edge of the transducer
lower than the trailing edge because aeration will occur.
CAUTION: Do not position the transducer farther into the water
than necessary to avoid increasing drag, spray, and water noise
and reducing boat speed.
1. Using a straight edge, sight the underside of the transducer
relative to the underside of the hull (see Figure 6). The trailing
edge of the transducer should be 1–3mm (1/16–1/8") below the
leading edge or parallel to the bottom of the hull.
2. Using the vertical adjustment space in the bracket slots, slide
the transducer up or down (see Figure 4). Be sure the bottom
left corner of the transducer projections 3mm (1/8") below the
bottom of the hull.
3. When you are satisfied with the position of the transducer,
tighten the bracket screws.
2
Figure 3. Mounting the transducer on the bracket
pivot post (2)
slot (2)
bracket
transducer
Figure 5. Mounting the bracket with shim (20• transom angle shown) Figure 4. Vertical adjustment and cable routing
50mm (2")
cable cover
Hull projection
3mm (1/8")
parallel to
cable clamp
detail
of shim shim
nuts
slot
screws
(#10 x 1-3/4"
self-tapping)
transducer
waterline cable
screw
(taper up)
bracket screw (actual size)
(actual size)
Copyright © 2003 - 2011 Airmar Technology Corp. Copyright © 2003 - 2011 Airmar Technology Corp.
Copyright © 2003 - 2011 Airmar Technology Corp.
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