Airmar B17-HP User Manual download pdf (Page 3)

fiberglass hull

plastic, bronze, or stainless steel housing

housing

hull nut

spacer

washer

hull

marine sealant on flange and

side wall of housing

Retractable Models

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

transducer insert (replace if necessary) and lubricate them with

the silicone lubricant supplied. The O-rings must be intact and

well lubricated to make a watertight seal.

2. Slide the insert into the housing. Seat the insert into place with a

twisting motion until the key fits into the notch. Be careful not to

rotate the housing and disturb the marine sealant. Screw the

cap nut in place and hand tighten only. Do not over tighten.

D/DT800—Be sure the insert is fully inserted into the housing.

Screw the cap nut several turns until the threads are engaged.

Continue to tighten the cap nut completely for a watertight seal.

3. Attach the safety wire to prevent the insert from backing out in

the unlikely event that the cap nut fails or is screwed on

incorrectly (see Figure 2 or 3).

Plastic housing—Attach the safety wire to one eye in the hull nut.

Keeping the wire taut throughout, lead the wire in a

counterclockwise direction and thread it through one eye in the cap

nut, the pull ring/eye in the insert, the second eye in the cap nut,

and the second eye in the hull nut. Twist the wire securely to itself.

Metal housing—Wrap one end of the safety wire tightly around

the housing and twist it together with the long end. Keeping the

wire taut throughout, lead the wire straight up and through the

eye in the cap nut. Loop the wire through the pull ring/eye in the

insert and twist it securely to itself.

Cable Routing & Connecting

CAUTION: If your transducer came with a connector, do not

remove it to ease cable routing. If the cable must be cut and

spliced, use Airmar’s splash-proof Junction Box No. 33-035 and

follow the instructions provided. Removing the waterproof

connector or cutting the cable, except when using a water-tight

junction box, will void the sensor warranty.

1. Route the cable to the instrument, being careful not to tear the

cable jacket when passing it through the bulkhead(s) and other

parts of the boat. Use grommets to prevent chafing. To reduce

electrical interference, separate the transducer cable from other

electrical wiring and the engine. Coil any excess cable and

secure it in place using cable ties to prevent damage.

2. Refer to the echosounder owner’s manual to connect the

transducer to the instrument.

Checking for Leaks

When the boat is placed in the water, immediately check around

the thru-hull transducer for leaks. Note that very small leaks may

not be readily observed. Do not leave the boat in the water for

more than 3 hours before checking it again. If there is a small

leak, there may be considerable bilge water accumulation after 24

hours. If a leak is observed, repeat “Bedding” and “Installing”

immediately (see page 2).

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.

CAUTION: Completely seal the hull to prevent water seepage into

the core.

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. (If the hole is drilled in the wrong location, drill a second hole

in a better location. Apply masking tape to the outside of the hull over the

incorrect hole and fill it with epoxy.)

Figure 2. Bedding and installing

retractable insert

washer

hull

pull ring

safety wire

cap nut

hull nut

washer

hull

pull ring

safety wire

cap nut (plastic)

hull nut

marine sealant on flange and

Figure 3. Bedding and installing

flush housing

metal housing

transducer insert

housing

side wall of housing

(B17 shown)

(P217 shown)

marine sealant on flange and

side wall of housing

stainless steel housing in a metal hull

(SS577 shown)

(plastic/metal)

(P319/B117 shown)

fiberglass or wood hullfiberglass or wood hull

retractable insert

marine sealant on flange and

isolation

bushing

washer

sidewall of housing

cap nut

hull

safety wire

housing

insert

(plastic)

(metal)

hull nut

and isolation bushing where it contacts hull

1 2 3 4

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Airmar B17-HP User Manual Page 3

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