Installation Instructions

ManualsBrandsFuruno ManualsSensorsFuruno 235DHT-LMSE

17-284-01 rev. 02 06/04

IMPORTANT

: Please read the instructions completely before proceeding with the installation.

These instructions supersede any other instructions in your instrument manual if they differ.

Retractable Thru-Hull Transducer

with High-Performance Fairing

Model: B122

Applications

• Bronze housing recommended for ﬁberglass or wood hulls only.

Caution

: NEVER

install a bronze housing in a metal hull

because electrolytic corrosion will occur.

•

Caution

: NEVER

install a metal

housing in a vessel with a

positive ground system.

• Maximum hull thickness with fairing (measured perpendicular to

the water surface): 47mm (1-7/8")

•Fairing can accommodate a deadrise angle of up to 35

Pre-test

Connect the transducer insert to the instrument. Hold the

transducer over the side of the boat with the active surface

submerged in the water and aimed at the bottom. Check for a depth

reading (and temperature if applicable). If there is no reading, check

all the connections and repeat the test. If there is still no reading or

it is inaccurate, return the product to your place of purchase.

Tools & Materials

Safety goggles

Dust mask

Electric drill with 10mm (3/8") or larger chuck capacity

Drill bits: pilot hole 3mm

1/8"

anti-rotation bolt 10mm

3/8"

Hole saw: 51mm

Digital level

bubble level & protractor

Band saw

hand saw

Rasp

power tool

Sandpaper

Mild household detergent

weak solvent (alcohol)

Marine sealant (suitable for below waterline)

Slip-joint pliers

Mallet

Zip-ties

Water based anti-fouling paint (

mandatory in salt water

)

Installation in a cored ﬁberglass hull

Transducer—hole saw for hull interior: min. 60mm

2-3/8"

Anti-rotation bolt—drill bit for hull interior: min. 19mm

3/4"

Cylinder, wax, tape, and casting epoxy

WARNING

Installation of the anti-rotation bolt is mandatory!

Failure to install the anti-rotation bolt may result in the fairing rotating while the

boat is underway. The effect may be violent movement and loss of steering. This

could result in serious injury or death to passengers and/or damage to the boat

or other property.

OWNER’S GUIDE & INSTALLATION INSTRUCTIONS

Record the information found on the cable tag for future reference.

Part No._________________Date___________Frequency________kHz

Summary of content (6 pages)

PAGE 1
OWNER’S GUIDE & INSTALLATION INSTRUCTIONS 06/04 IMPORTANT: Please read the instructions completely before proceeding with the installation. These instructions supersede any other instructions in your instrument manual if they differ. 17-284-01 rev. 02 WARNING Installation of the anti-rotation bolt is mandatory! Failure to install the anti-rotation bolt may result in the fairing rotating while the boat is underway. The effect may be violent movement and loss of steering.
PAGE 2
AIRMAR ® pressure waves 1/3 aft LWL (Load Waterline Length) 150-300mm (6-12") displacement hull 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 sailboat—Mount to the side of the centerline and forward of the fin keel 300–600mm (1–2').
PAGE 3
WARNING Installation of the anti-rotation bolt is mandatory! Failure to install the anti-rotation bolt may result in the fairing rotating while the boat is underway. The effect may be violent movement and loss of steering. This could result in serious injury or death to passengers and/or damage to the boat or other property. Cutting the Fairing Hole Drilling—Anti-rotation Bolt 1.
PAGE 4
AIRMAR ⇐ BOW ® detail cap shown in plastic & bronze anti-rotation bolt backing block nut & washer hull triangular plug with curved surface facing outward fairing marine sealant Figure 5. Bedding and installing the anti-rotation bolt Bedding the Transducer Housing Installing the Transducer Housing 1. Remove the transducer housing from the fairing. 1.
PAGE 5
AIRMAR Installation in a Cored Fiberglass Hull ® The core (wood or foam) must be cut and sealed carefully. The core must be protected from water seepage, and the hull must be reinforced to prevent it from crushing under the hull nut allowing the housing to become loose. key large O-ring Warning: Always wear safety goggles and a dust mask. small O-ring 1. Drill a 3mm or 1/8" pilot hole perpendicular to the waterline from inside the hull (see Figure 8).
PAGE 6
Maintenance & Parts Cleaning Blanking Plug WARNING: THE O-RINGS MUST BE INTACT AND WELL LUBRICATED TO PROVIDE A WATERTIGHT SEAL. 1. Inspect the O-rings on the blanking plug and lubricate them with silicone lubricant or petroleum jelly (Vaseline®) (see Figure 7). 2. Remove the safety wire from the pull ring and cap nut. Then, unscrew the cap nut (see Figure 5). 3. With the blanking plug ready in one hand, pull the insert most of the way out. Remove the insert and rapidly replace it with the blanking plug.