Trial Installation - Humminbird PiranhaMAX 155 Installation And Operation Manual

Figure 27

Trial Installation

You will not be able to adjust the mounting after an inside the hull transducer
is installed. It is best, therefore, to perform a trial installation first that includes
running the boat at various speeds, in order to determine the best mounting
area before permanently mounting the transducer.
1. Plug the transducer into the control head, then power up the control
head. When the control head detects a functioning transducer, it will
automatically enter Normal operating mode.
2. View the sonar signal at its best by holding the transducer over the
side, immersed in the water, so that it is pointing straight down over a
known flat bottom. Use the display to benchmark against the sonar
signal that will be detected once the transducer is placed in the hull.
3. Place the transducer body face down at the identified mounting location
inside the hull, with the pointed end towards the bow (Figure 27).
4. Fill the hull with enough water to submerge the transducer body. Use
a sand-filled bag or other heavy object to hold the transducer in
position. The transducer cannot transmit through air, and the water
purges any air from between the transducer and the hull, and fills any
voids in the coarse fiberglass surface.
Preferred Mounting Area
Figure 28
19
Inside the Hull Transducer Installation