Airmar B744V Bedienungsanleitung PDF herunterladen (Seite 2)

Mounting Location

Guidelines

CAUTION: Do not mount in line with or near water intake or

discharge openings or behind strakes, fittings, or hull irregularities

that will disturb the water flow.

CAUTION: Do not mount the sensor where the boat may be

supported during trailering, launching, hauling, or storage to avoid

damaging the transducer’s face.

• The water flowing under the hull must be smooth with a

minimum of bubbles and turbulence (especially at high speeds).

• The sensor 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.

• Choose a location with a minimum deadrise angle.

• Choose an accessible spot inside the vessel with adequate

headroom for the height of the housing, tightening the nut(s),

and installing any insert.

Model

Min. with fairing

B744V 255mm (10")

B744VL 381mm (15")

• CHIRP transducer—Mount in a cool well-ventilated area away

from the engine to avoid overheating.

Boat Types (see Figure 1)

• Displacement hull powerboat—Locate 1/3 of the way along

the LWL and 150–300mm (6–12") off the centerline. The

starboard side of the hull where the propeller blades are moving

downward is preferred.

• Planing hull powerboat—Mount well aft near the centerline and

well inboard of the first set of lifting strakes to ensure that it is 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 forward and to the side of the engine(s).

Inboard—Mount well ahead of the propeller(s) and shaft(s).

Stepped hull—Mount just ahead of the first step.

Boats capable of speeds above 25kn (29MPH)—Review

sensor location and operating results of similar boats before

proceeding.

• Fin keel sailboats—Mount to the side of the centerline and

forward of the fin keel 300–600mm (1–2').

• Full keel sailboats—Locate amidships and away from the keel

at the point of minimum deadrise angle.

Installation: B744V, B744VL

Installing the Cap Nut

CAUTION: Avoid cross threading the CAP nut.

Being sure the valve assembly is seated firmly within the housing,

carefully screw the CAP nut in place (see Figure 2). Hand-tighten

only. Do not over tighten.

Installing the Paddlewheel Insert

1. After the sealant cures, inspect the O-rings on the paddlewheel

insert (replace if necessary) and lubricate them with the silicone

lubricant supplied (see Figure 3). The O-rings must be intact and

well lubricated to make a watertight seal.

2. Slide the paddlewheel insert into the housing with the arrow on

the top pointing forward toward the bow. Seat it into place using

a twisting motion until the keys fit into the notches. (The insert

fits one way only.) Be careful not to rotate the outer housing and

disturb the sealant. Screw the INSERT nut in place and hand-

tighten only. Do not over tighten.

3. 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. Wrap one end of the safety wire tightly around the

stem of the housing and twist it together with the long end (see

Figure 2). Keeping the wire taut throughout, lead the wire straight

up and through one eye in the CAP nut. Thread the wire through

the eye a second time. Lead the wire in a counterclockwise

direction and thread it through the eye in the INSERT nut. Thread

the wire through that eye a second time. Loop the wire through the

pull ring and twist the wire securely to itself.

Figure 1. Best location for the sensor

inboard

pressure waves

1/3

full keel sailboat

displacement hull

(6–12")

fin keel sailboat

150– 300mm

LWL

(Load Waterline Length)

stepped hull

outboard and I/O

planing hulls

Figure 2. B744V/VL: Cap nut and safety wire

pull ring

hull

safety wire

cap nut

hull nut

stem

cable

insert nut

NOTE: Do not remove

the CAP nut to service

the paddlewheel insert.

The valve assembly

will come out.

Aft View

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