Hummingbird XTH 9 20 P Manual

Plastic Thru-Hull Transducer

Overview

Before you start installation, we encourage you to read these instructions carefully in order to get the full benefit from
your Humminbird® accessory.
NOTE: This type of transducer installation is not recommended for trailerable boats.
NOTE: This transducer requires drilling a hole in the hull of the boat; therefore, installation should be performed by a
qualified marine technician.
Supplies: In addition to the hardware supplied with your transducer, you will need a drill, a small drill bit for a pilot
hole, a 1 1/8" hole saw, a level, marine-grade silicone sealant, a Phillips-head screwdriver, and dielectric grease.
Customer Service: To purchase additional equipment, or if you find that any items are missing from your installation
kit, visit our Web site at humminbird.com or call us at 1-800-633-1468.

Installation

Perform the procedures in the following sections to install the transducer on your boat.
1.
Testing the Transducer Prior to Installation
Prior to installation, test the transducer to make sure that no damage occurred during shipping.
1. Connect the transducer cable connector to the control head port or black box sonar, depending on your system
configuration.
2. Power on the control head. Select a sonar view to display on-screen.
3. Hold the transducer in the water over the side of the boat to confirm proper operation. If the transducer is working
properly, you should be able to see the bottom on the control head display. The bottom image should be relatively
strong and there should be detailed structure on the display.
4. After confirming proper operation, power off the control head, and unplug the transducer cable connector from
the control head or black box sonar.
2.
Locating the Transducer Mounting Position
Outside the boat, the best location for the transducer will be aft midship, as close to the centerline of the boat as
possible. The transducer should be mounted forward of the propellers on inboard boats, and separated adequately
from other transducers, strakes, rivet lines, or other protrusions. Make sure that there is nothing in front, behind, or to
the side of the transducer that is closer than 12".
WARNING! Do NOT install the transducer in line with the engine intake.
Inside the boat, there must be room to access the mounting location for installation and cable routing.
Deadrise: Another consideration is the angle of deadrise. The transducer, when mounted, should point straight down.
If the selected mounting location has a hull deadrise of 8 degrees or more, the included leveling block should be used
to level the transducer housing and direct the sonar signal straight down. If you need to use the leveling block, make
sure that the inside surface of the hull is smooth enough to seat the leveling block securely.
NOTE: If you cannot find a location that will work for your application, find a different transducer by visiting the FAQ
(Frequently Asked Questions) section of our Web site at humminbird.com or by calling Humminbird Customer Service
at 1-800-633-1468.
1
530758-5_B
Thru-Hull Installation
Deadrise Angle
Areas of Possible Turbulence
Rivets Transom
Strakes Hull
Preferred Mounting Location