17-438-01 rev. 03 07/20/10
B744V, B744VL TRIDUCER® Multisensor
Retractable with Valve
B765LH, B765LM Transducer
U.S. Patent: 7,369,458. UK 2 414 077. U.S. Patent Pending
Applications
Bronze sensor recommended for fiberglass or wood hull only.
Identify Your Model
The model name is printed on the cable tag.
B744V/VL: Pretest
Connect the multisensor to the instrument and spin the
paddlewheel. Check for a speed reading and the approximate air
temperature. If there is no reading or it is inaccurate, check the
connections and repeat the test. If there is still no reading or they
are inaccurate, return the product to the place of purchase.
About High-Performance Fairings
Airmar recommends installing a High-Performance Fairing unless
insufficient space demands a Standard Fairing. Airmar’s High-
Performance Fairings have a long streamlined shape that directs
water around the sensor to minimize drag. Performance is excellent
above 15 knots (see Replacement Sensor & Parts on page 6).
Record the information found on the cable tag for future reference.
Part No._________________Date___________Frequency________kHz
B744V
Standard
High-Performance
Fairing
Fairing
INSTALLATION INSTRUCTIONSOWNER’S GUIDE &
B765LH/LM
CAUTION: Never install a metal housing in a vessel with
a positive ground system.
CAUTION: Never, pull, carry, or hold the sensor by its
cable. This may sever internal connections.
CAUTION: Never strike the sensor.
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: The sensor must be installed carefully. Read
the instructions completely before proceeding with the
installation. These instructions supersede any other
instructions in your instrument manual if they differ.
WARNING
The sensor must be installed with a fairing!
A fairing that is carefully cut to fit the shape of the hull
provides a sealing surface around the drilled hole. If the
sensor is not installed with a fairing, there may be
insufficient surface area to seal the hull. Water may leak
into the boat causing damage or possibly sinking.
WARNING: B765LH, B765LM—The B765LH/LM must
be installed with a High-Performance Fairing only! It will
not mate and seal with a standard fairing.
WARNING: A High-Performance Fairing must be installed
following the Installation Instructions that come with the
fairing. A High-Performance Fairing requires an anti-
rotation bolt to keep the fairing from turning while the boat
is underway.
WARNING: Always wear safety goggles and a dust mask
to avoid personal injury.
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: B744V, B744VL—The O-rings must be intact
and well lubricated to make a watertight seal.
WARNING: B744V, B744VL—Always attach the safety
wire to prevent the insert from backing out in the unlikely
event that the cap nut and/or insert nut fails or is screwed
on incorrectly.
WARNING: B744V, B744VL—The valve is not a
watertight seal. Always install the paddlewheel insert or
the blanking plug secured with the insert nut and safety
wire for a watertight seal.
WARNING: B744V, B744VL—Do not remove the CAP nut.
The valve assembly will come out. The insert/blanking plug
cannot be secured without the valve assembly.
CAUTION: Never mount a bronze housing in a metal hull
because electrolytic corrosion will occur.
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