Airmar P52 with Plastic Release Bracket 20-039 - Manual (Page 3)

3
Mounting & Adjusting
1. Cut-out the template (see Figure 5).
2. At the location selected , position the template so the arrow is aligned
with the bottom edge of the transom. Being sure the template is parallel
to the waterline, tape it in place (see Figure 4).
3. Using a 4mm, #23, or 9/64" bit, drill three holes 22mm (7/8") deep at
the locations indicated.
4. Apply marine sealant to the threads of the #10 x 1-3/4" self-tapping
screws to prevent water seepage into the transom. Slide a flat washer
onto each screw and fasten the bracket assembly to the hull. Do not
tighten the screws completely at this time.
5. Using the vertical adjustment space on the bracket slots, slide the
sensor up or down to provide a projection of 3mm (1/8") (see Figure 6).
6. Adjust the angle of the sensor on the bracket. Using a straight edge,
sight the underside of the sensor relative to the underside of the hull
(see Figure 7). For best results, the trailing edge of the sensor should
be 1-3mm (1/16-1/8") below the leading edge of the sensor or parallel
to the bottom of the hull (see Figure 3). Tighten the screws.
Cable Routing
CAUTION: Do not remove the connector 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.
Route the sensor cable(s) over the transom, through a drain hole, or
through a new hole drilled in the transom above the waterline.
1. If a hole must be drilled through the transom, choose a location well
above the waterline. Check for obstructions such as trim tabs, pumps,
or wiring inside the hull. Mark the location with a pencil. Drill the hole
using the appropriate hole saw or spade bit (to accommodate the
connector).
2. Route the cable(s) over or through the transom.
3. On the outside of the hull secure the cable(s) against the transom using
the cable clamps. Position a cable clamp 50mm (2") above the bracket
and mark the mounting hole with a pencil (see Figure 8).
4. Position the second cable clamp halfway between the first clamp and
the cable hole. Mark this mounting hole. If there are two cables, repeat
this step.
5. If a hole has been drilled through the transom, open the appropriate
slot(s) in the cable cover. The cable cover can accommodate two
cables when there are separate cables for depth and speed/
temperature functions. Position the cover over the cable(s) where it
enters the hull. Mark the two mounting holes.
6. At each of the marked locations, use a 3mm or 1/8" bit to drill a hole
10mm (3/8") deep.
7. Apply marine sealant to the threads of the #6x1/2" self-tapping screws
to prevent water from seeping into the transom. If you have drilled a
hole in the transom, apply marine sealant to the space around the cable
where it passes through the transom.
8. Position the two cable clamps and screw them in place. If used, push
the cable cover over the cable(s) and screw it in place.
9. Route the cable(s) to the instrument(s) being careful not to tear the
cable jacket(s) when passing it through the bulkhead(s) and other parts
of the boat. To reduce electrical interference, separate the sensor
cable(s) from other electrical wiring and sources of noise. Coil any
excess cable and secure it in place with zip-ties to prevent damage.
10.Refer to the echosounder owner’s manual(s) to connect the sensor to
the instrument(s).
Checking for Leaks
When the boat is placed in the water, immediately check for leaks around
the screws and any 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.
Antifouling Paint
Aquatic growth can accumulate rapidly on the sensor’s surface reducing
performance within weeks. Surfaces exposed to salt water that do not
interlock, must be coated with antifouling paint. Use water-based anti-
fouling paint only. Never use ketone based paint, since ketones can attack
many types of plastic possibly causing damage to the transducer. Reapply
paint every 6 months or at the beginning of each boating season.
Operation
CAUTION: Do not attempt to manually release the bracket. Prying
the release arms may cause fractures resulting in bracket failure.
The bracket releases immediately upon impact. To reset, push down on
the release arms until they snap into place. The arms are then locked in
the operating position.
Figure 6. Hull projection
Figure 8. Cable routing
50mm (2")
cable cover
cable clamp
parallel slight angle
angle too severe
YES YES
NO
NO
Figure 7. Sensor angle adjustment (P37 shown)
angle in wrong direction
Hull projection
3mm (1/8")