Furuno 525T-LTD-12, 525T-LTD-20, 555-SLTD-12, 555-SLTD-20 Installation Instructions
INSTALLATION INSTRUCTIONSOWNER’S GUIDE &
Thru-Hull, without Valve
™
Tilted Element
Tilt Angles: 0°, 12°, 20
Models: B60, B75H, B75L, B75M, B619
U.S. Patent No. 7,369,458. UK Patent No. 2 414 077. U.S. Patent Pending
Follow the precautions below for optimal product
performance and to reduce the risk of property damage,
personal injury, and/or death.
WARNING: Always wear safety goggles and a dust
17-364-01 rev. 05 03/16/11
mask when installing.
WARNING: Immediately check for leaks when the
boat is placed in the water. Do not leave the boat
unchecked for more than three hours. Even a small
leak may allow considerable water to accumulate.
WARNING: B619 and SS619—Do not use the spacer
if there is insufficient space to tighten the nut, or it is
within 11mm (1/2") of the top of the housing.
WARNING: Stainless steel housing in a metal hull—
Be sure the washer contacts the hull. Do not tighten
the hull nut with the washer against the isolation
bushing, as the housing will not be firmly installed. If
necessary, sand the isolation bushing until the washer
rests against the hull.
CAUTION: The arrow on the top of the transducer
must point toward the keel or centerline of the boat.
This will align the angle of the element inside the
transducer with the deadrise angle of your hull.
CAUTION: Never pull, carry, or hold the transducer by
its cable; this may sever internal connections.
CAUTION: Never install a metal transducer on a
vessel with a positive ground system.
CAUTION: Plastic housing—Never use a fairing with
a plastic housing; the protruding sensor would be
vulnerable to damage from impact.
CAUTION: Metal housing—Never install a metal
housing on a vessel with a positive ground system.
CAUTION: Stainless steel housing in a metal hull—
The stainless steel housing must be isolated from a
metal hull to prevent electrolytic corrosion. Use the
isolation bushing supplied.
CAUTION: Never use solvents. Cleaners, fuel,
sealants, paint, and other products may contain strong
solvents, such as acetone, which attack many
plastics, greatly reducing their strength.
IMPORTANT: Read the instructions completely
before proceeding with the installation. These
instructions supersede any other instructions in your
instrument manual if they differ.
P19, SS60, SS565, SS619
Transducer
Record the information found on the cable tag for future reference.
Part No._________________Date___________Frequency________kHz
°
P19
Applications
• Plastic housing recommended for fiberglass or metal hulls only.
Never install a plastic housing in a wood hull since swelling of
the wood can fracture the plastic.
• Bronze housing recommended for fiberglass or wood hulls.
Never install a bronze housing in a metal hull, because
electrolytic corrosion will occur.
• Stainless steel housing compatible with all hull materials.
Recommended for metal hulls to prevent electrolytic corrosion
provided the stainless steel housing is isolated from the metal hull.
Match Tilt Angle of Transducer to Deadrise
Be sure the tilt angle of your transducer model matches the
deadrise angle of your boat at the mounting location. The tilt angle
is printed on the top of the transducer (see Figure 1). To measure
the deadrise angle of your hull at the selected mounting location,
use an angle finder or a digital level (see Figure 2).
• 0° models—For hull deadrise angles from 0° to 7°
• 12° models—For hull deadrise angles from 8° to 15°
B75L-12°—For hull deadrise angles from 0° to 24°
B75H-12°—For hull deadrise angles from 6° to 15°
B75M-12°—For hull deadrise angles from 6° to 15°
• 20° models—For hull deadrise angles from 16° to 24°
12° model 20° model
KEEL
AIRMAR®
TILT
O
12
Figure 1. Top of transducer
Copyright © 2005 Airmar Technolog y Corp.
transom view
Figure 2. Deadrise angle of the hull
Copyright © 2005 Airmar Technolog y Corp.
KEEL
AIRMAR®
slope of hull
deadrise angle
parallel to waterline
20
TILT
O
Identify Your Model
The model name is printed on the cable tag.
Model
(Housing)
P19
B619
SS619
SS619 metal 57mm or 2-1/4" NA
B60
SS60
SS56
B75
SS60 metal 70 mm or 2-3/4" NA
SS565 metal 70mm or 2-3/4" NA
Hull Material
fiberglass
metal
fiberglass
wood
fiberglass
wood
fiberglass
wood
Outside Hull
Hole Saw Size
51mm or 2" 60mm or 2-3/8"
51mm or 2" 60mm or 2-3/8"
60mm or 2-3/8" 80mm or 3-1/8"
70mm or 2-3/4" 80mm or 3-1/8"
Cored Fiberglass Hull
Hull Interior
Hole Saw Size
Tools & Materials
Safety goggles
Dust mask
Electric drill with 10mm (3/8") or larger chuck capacity
Drill bit: 3mm or 1/8"
Hole saw (see table below)
Countersink tool (installing SS565)
Sandpaper
Mild household detergent or weak solvent (such as alcohol)
File (installation in a metal hull)
Marine sealant (suitable for below waterline)
Slip-joint pliers (installing a metal housing)
Grommet(s) (some installations)
Cable ties
Water-based anti-fouling paint (mandatory in salt water)
Installation in a cored fiberglass hull (see page 4):
Hole saw for hull interior (see table below)
Fiberglass cloth and resin
or Cylinder, wax, tape, and casting epoxy
Mounting Location
CAUTION: Do not mount near water intake or discharge openings
or behind strakes, fittings, or other hull irregularities.
CAUTION: Do not mount in line with trailer rollers or bunks that
may damage the transducer’s face.
large displacement hulls
planing hulls
small displacement hulls
• The water flowing under the hull must be smooth with a
minimum of bubbles and turbulence (especially at high speeds).
• The transducer must be continuously immersed in water.
• The transducer beam must be unobstructed by the keel or
propeller shaft(s).
• Choose a location away from interference caused by power and
radiation sources such as: the propeller(s) and shaft(s), other
machinery, other echosounders, and other cables. The lower
the noise level, the higher the echosounder gain setting that
can be used.
Hull Types (see Figure 3)
• Displacement hull powerboats—Locate amidships near the
centerline. The starboard side of the hull where the propeller
blades are moving downward is preferred.
• Planing hull powerboats—Mount well aft, on or near the
centerline, and well inboard of the first set of lifting strakes to
ensure that the transducer will be in contact with the water at high
speeds. The starboard side of the hull where the propeller
blades are moving downward is preferred.
Outboard and I/O—Mount just forward of the engine(s).
Inboard—Mount well ahead of the propeller(s) and shaft(s).
Stepped hull—Mount just ahead of the first step.
Boat capable of speeds above 25kn (29MPH)—Review the
installation location and operating results of similar boats before
proceeding.
• Fin keel sailboats—Mount as close as possible to the
centerline and forward of the fin keel 300–600mm (1–2').
• Full keel sailboats—Locate amidships and away from the keel.
Installation
Hole Drilling
Cored fiberglass hull—Follow separate instructions on page 4.
1. Drill a 3 mm 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.
2. Using the appropriate size outside hull hole saw, cut a hole
from outside of the hull perpendicular to the hull surface (see
table above).
SS565—Use a countersink tool to create a “seat” in the hull.
3. Sand and clean the area around the hole, inside and outside, to
ensure that the sealant will adhere properly to the hull. If there is
any petroleum residue inside the hull, remove it with either mild
household detergent or a weak solvent (alcohol) before sanding.
Metal hull—Remove all burrs with a file and sandpaper.
Bedding
CAUTION; Be sure the surfaces to be bedded are clean and dry.
outboard and I/O
stepped hull
Apply a 2mm (1/16") thick layer of marine sealant around the
flange of the housing that contacts the hull and up the sidewall of
the housing (see Figure 4 or 5). The sealant must extend 6mm
(1/4") higher than the combined thickness of the hull, washer(s),
fin keel sailboats
and the 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
full keel sailboats
metal hull. Slide the isolation bushing onto the housing (see
Figure 5). Apply additional marine sealant to the surfaces of the
Figure 3.
Best location for transducer
Copyright © 2005 Airmar Technolog y Corp.
bushing that will contact the hull, filling any cavities in and around
the isolation bushing.
2
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