Humminbird PIRANHA 3, PIRANHA 4 INSTALLATION

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PIRANHA 3 & 4 INSTALL GUIDE

Two components need to be installed on the boat: the transducer and the control head. The control head displays sonar information, the transducer sends and receives sonar signals into the water. Proper installation of each insures best performance of the Piranha and provides the greatest enjoyment and functionality.

Due to the wide variety of boats only general instructions are presented in this installation guide. Each boat has unique characteristics that need to be evaluated.

You will need: Hand drill and various bits, Phillips #2 & 3 drivers, pencil, silicone sealant (for drilled holes), 2-part, slow cure epoxy for inside hull transducer mounting, 12v DC power supply, 1 ampere fuse.

INSTALLING THE TRANSDUCER

STEP 1: DETERMINE TRANSDUCER LOCATION

Consider the following to find the best location on the transom:

Choose an area free of turbulent water.

Turbulence is generated as the boat moves through the water and is confined to area aft of ribs, strakes and rivet lines on the bottom of hull. Choose a location on the transom where the hull forward of this location is smooth, flat and free of protrusions or ribs.

Turbulence is also created by the prop - try to keep at least 380mm (15") from the prop(s).

The best method to locate areas free of turbulence is to watch the transom while the boat is moving. For best high-speed performance this is recommended. Have an assistant pilot the boat and use caution!

Stepped hulls require the transducer be mounted on the step if possible. Never mount the transducer on the transom behind the step.

If propellers are forward of the transom, clear water may be impossible to find. A different transducer or mounting method should be considered, (see optional inside hull instructions below).

15" 15"

Figure 1. Mounting locations include transom and inside hull.

The mounting area must be in contact with the water when the boat is on plane.

If the boat is trailered, make sure that the transducer is not inline with trailer bunks or roller assembles that could damage the transducer during loading operations.

Turbulence

Figure 2, Location of turbulence

STEP 2: FOR TRANSOM MOUNTING: DRILL THE

MOUNTING HOLES

1.Remove the mounting template from the last page of Operation Section (Page O-15). This template provides a means of locating the two mounting holes which must be drilled.

2.Hold the template on the transom of the boat in the location where the transducer will be installed. Align the template vertically with the inside arrow of the template on the deadrise where the bottom of the hull meets the transom wall. (Figure 3 ).

3.Using a pencil or punch, mark the location of the two mounting holes on the transom.

4.Using a 4mm (⁄") bit, drill the two holes to a depth of approximately 25mm (1"). On fiberglass hulls, it is best to start with a smaller bit and use progressively larger drill bits to reduce the chance of chipping or flaking the outer coating.

Level

TOP

Use 5/32" drill bit

Drill

Drill

PLACE EITHER ARROW

ON DEADRISE ANGLE

Figure 3

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Humminbird PIRANHA 3, PIRANHA 4 INSTALLATION

STEP 3: ASSEMBLE & MOUNT THE TRANSDUCER

1.Attach the Transducer Body to the Bracket using the hardware shown below.

2.Tighten the Pivot Bolt just enough so the transducer can rotate, but remain in a place when released.

3.Apply silicone sealant into the drilled mounting holes.

4.Align the transducer with the mounting holes and attach with Phillips screws provided.

5.Tighten the Mounting Screws just enough so the transducer can move vertically, but remain in a place when released.

Mounting Bracket

Star lock washers

Pivot

Nut

Cable

Pivot Bolt ¹⁄-20, #3 Phillips Drive

Transducer

Figure 4

Note: A third mounting screw location is provided in the mounting bracket. Drill and install this ONLY after final testing and adjustments have been made.

STEP 4: ADJUST THE TRANSDUCER

Correct transducer height and running angle settings are needed to ensure best performance at all boat speeds. Use the template provided (pg. O-15) to make the initial setting for most boats. Some boat hulls require adjustments beyond these settings for best performance at all speeds.

1.Cut out the transducer templates from the Piranha package printed template insert following the cutting directions for your boat hull.

2.Adjust the height on the transom and the pivot bolt angle to match guides on the template as shown.

3.Hand tighten the Pivot Bolt and Mount Screws at this time. Ensure the height and angle have not changed.

Transducer

 

 

r bottom

 

 

 

Transduce

Fiberglass

Hulls

Cut and use for

 

 

 

Aluminum

Hulls

 

Cut and use for

 

 

 

 

 

 

 

Fiberglass

Aluminum

15mm

30mm

Transducer

 

 

 

 

 

 

 

 

 

 

Guide

 

Hull

Place on bottom of hull

Align with transom.

Templates supplied locating the transom bracket and adjusting the transducer’s position.

Figure 5

STEP 5: ROUTE THE CABLE

The cable must be routed to where the control head will be mounted. Consider the following:

The easiest method to get the cable into the boat routes the cable over the transom. The most common method drills a hole through the transom, above the water line.

Once inside the boat, the cable routes through or along internal conduits and channels.

Keep the cable as far away as possible from VHF radio antenna and tachometer cables.

Do not cut, shorten or lengthen the transducer cable.

If the cable is too short, extensions are available at your dealer or direct from Humminbird.

FOLLOW THESE STEPS:

1.Run the cable over the transom or through a 16mm (⁄") hole drilled well above the water line.

2.If a hole was drilled, fill it with silicone sealant.

3.Secure the cable with clamps as shown. (Figure 6).

Cable Clamps

Note: Allow enough

slack in the cable for

 

 

the transducer to

 

pivot. Route the

6"

cable to side of

150mm

the transducer.

Figure 6

 

INSTALLING THE CONTROL HEAD

STEP 1: ASSEMBLE THE BASE

1.Insert the Mount Arms through the Base.

2.Secure the Mount Arms with the 4 screws provided.

Arm Screws, 4 #6 x ⁄"

Left Arm

Right Arm

Figure 7

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