Furuno DFF-3D Operator's Manual page 67

2. Apply sealant to the threads of the remaining screw to prevent
water seeping into the transom.
3. Fasten the stabilizing screw into place with a socket wrench.
For clear access to the screw, remove the transducer assembly
from the bracket (see Figure 4). When reattaching the
transducer, be sure to include the spacer.
Cable Routing & Connecting
CAUTION: Do not remove the connectors to ease cable routing. If
the cables must be cut and spliced, use Airmar's splash-proof
Junction Box No. 33-035 and follow the instructions provided.
Removing the waterproof connectors or cutting the cables, except
when using a water-tight junction box, will void the sensor warranty.
Route the cables over the transom for a detachable installation.
For permanent mounting, route the cables through a drain hole or
through new holes drilled in the transom above the waterline .
1. If holes must be drilled through the transom, choose a location
well above the waterline (see Figure 7). Check for obstructions
such as trim tabs, pumps, or wiring inside the hull. Mark the
locations with a pencil. Drill each hole using a 21mm or 13/16"bit
to accommodate the connector.
2. Route the cables over or through the transom.
3. On the outside of the hull, secure each cable against the
transom using the cable clamps supplied. For the first cable,
position one cable clamp 30cm (12") above the bracket. Mark
the mounting hole with a pencil.
4. Position the second cable clamp halfway between the first
clamp and the cable hole. Mark this mounting hole.
5. If a hole has been drilled through the transom, open the large
slot in each transom cable cover. Position a cover over the
cable where it enters the hull. Mark the two mounting holes.
6. For the second cable, repeat steps 3, 4, and 5.
7. At each of the marked locations, use a 3mm or 1/8" bit to drill a
hole 10mm (3/8") deep.
8. Apply marine sealant to the threads of the #6 x 1/2" self-tapping
screws to prevent water from seeping into the transom. If you
have drilled holes through the transom, apply marine sealant to
the space around the cables where they pass through the
transom.
9. Position the four cable clamps and fasten them in place. If
used, push a cable cover over each cable and screw them in
place.
10.Route the cables to the instrument being careful not to tear the
cable jackets when passing it through the bulkhead(s) and
other parts of the boat. Use grommet(s) to prevent chafing. To
reduce electrical interference, separate the transducer cables
from other electrical wiring and the engine(s). Coil any excess
cable and secure it in place with cable ties to prevent damage.
11.Refer to your echosounder owner's manual to connect the
transducer to the instrument.
4
APPENDIX 4 INSTALLATION OF TRANSDUCER TM54
Figure 7. Cable routing
Copyright © 20017 Airmar Technology Corp.
Checking for Leaks
When the boat is placed in the water, immediately check for
leaks around the screws and any other holes drilled in the hull.
Note that very small leaks may not be readily observed. Do not
leave the boat in the water unchecked for more than three hours.
Maintenance
Anti-fouling Paint
CAUTION: Do not paint the exposed temperature button. Doing
so will slow the sensor's response time.
Aquatic growth can accumulate rapidly on the transducer's face
reducing performance within weeks. Surfaces exposed to salt
water that do not interlock must be coated with anti-fouling paint.
Use water-based anti-fouling paint only. Never use ketone-based
paint, since ketones can attack many types of plastic possibly
damaging the transducer. Repaint every 6 months or at the
beginning of each boating season.
Cleaning
CAUTION: Do not use a lubricant on the bracket; grit will stick to
it, increasing friction and wear.
Clean the sensor with a Scotch-Brite® scour pad and mild
household detergent, taking care to avoid making scratches on
the transducer's face. If the fouling is severe, lightly wet sand with
fine grade wet/dry paper.
Transducer Replacement & Parts
The information needed to order a replacement transducer is printed
on the cable tag. Do not remove this tag. When ordering, specify the
part number, date, and frequency in kHz. For convenient reference,
record this information on the top of page one.
Lost, broken, and worn parts should be replaced immediately.
B a r k c t e A s s e m b y l
Please contact your Furuno dealer to obtain parts.
cable cover (2)
cable clamp (4)
30cm (12")
3 3 7 - 4 9 0 - 1
AP-11