Humminbird XTH 9 20 P User manual

Bronze Thru-Hull Transducer
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Thank You
Thank you for choosing Humminbird®, America's #1 name in fishfinders. Humminbird® has built its reputation
by designing and manufacturing top-quality, thoroughly reliable marine equipment. Genuine Humminbird®
accessories offer the opportunity to upgrade and expand the capabilities of your Humminbird® product.
Your Humminbird® is designed for trouble-free use in even the harshest marine environment. In the unlikely
event that your Humminbird® does require repairs, we offer an exclusive Service Policy - free of charge
during the first year after purchase, and available at a reasonable rate after the one-year period. For
complete details, see the Warranty section included in this manual.
Installation Overview
Following are instructions for the installation of this accessory. 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.
In addition to the hardware supplied with your transducer, you will need a drill, a small drill bit for a pilot
hole, a hole saw to fit the threaded stem of the transducer, a large adjustable wrench, a level, and marine-
grade silicone sealant.
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. After connecting the transducer to the fishfinder, 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.
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".
Inside the boat, there must be room to access the mounting location for installation and cable routing.
Thru-Hull Installation
Deadrise Angle
Areas of Possible Turbulence
Rivets Strakes
Transom Hull
Preferred Mounting Location
Bronze Thru-Hull Transducer
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530513-2_C
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 greater, a 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 the included transducer will not work for your application, you may exchange it, NEW and
UNASSEMBLED, with mounting hardware included, for a transducer appropriate for your application - often at
very little or no charge depending on the transducer.
3. Attaching the Transducer
Before attaching your transducer, you will need to decide which type of installation to use:
• For a standard installation, where the deadrise is less than 8 degrees, you do not need to use a leveling
block because the transducer will be mounted directly to the hull; drill the hole perpendicular to the hull.
• For an installation where the deadrise is greater than 8 degrees, use a suitable leveling block (not
included), cut at the appropriate angle, to compensate for the deadrise. Drill the hole perpendicular to
the waterline.
1. From the outside of the hull, drill a small pilot hole (smaller than the centering bit of your drill bit or hole
saw), at the mounting location you selected in procedure 2.
CAUTION: Before you drill, make sure you are drilling in the correct orientation according to the installation
guidelines above.
2. Use the pilot hole (from the outside of the hull) to drill a hole sized to fit the threaded stem of the
transducer:
NOTE: If you are mounting the transducer body directly to the hull, drill the hole perpendicular to the hull.
NOTE: If you are using a leveling block, drill the hole perpendicular to the waterline.
3. Thoroughly clean and deburr the drilled hole and clean the outside of the hull.
4a. If you are not using a leveling block, skip to step 5.
OR...
4b. If the hull angle is greater than 8 degrees, you should use a leveling block (not included) to level the
transducer. The block (usually made of wood) should be cut to match the angle of the deadrise of the hull.
You should cut the leveling block into two equal pieces: one which mounts outside the hull and is shaped
to match the profile of the transducer, and one which mounts inside the hull and provides a level surface
for the fasteners. The thinnest wall of the outside level block must be at least 1/8".
NOTE: A separately-purchased fairing block can also be used to create a hydrodynamic waterflow around the
transducer body. A fairing block is required for round body transducers as well. The design and fabrication of this
block varies greatly with different hull shapes; therefore, it should be customized by a qualified marine technician.
5. Feed the cable through the hole, then temporarily install the transducer to check the fit.
NOTE: If the transducer is round it may have a notch on the housing and stem which indicates the forward side
of the transducer. This type of transducer is directional in nature and must be aligned with the front of the boat
(the direction of travel). Failure to align the transducer notches with the front of the boat will result in
incorrect bottom readings and incorrect fish locations.
Leveling Block Assembly to Hull
Leveling
Blocks
Hull Cross
Section
Transducer
Housing
Attaching the Transducer
Extension
Cable
Transducer
Cable
Nut
Hull Cross
Section
Align
notches
with the
front of the
boat, if applicable
Transducer Housing

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Maintenance
If your boat remains in the water for long periods of time, algae and
other marine growth can reduce the effectiveness of the transducer.
Periodically clean the face of the transducer with hot water.
If your boat remains out of the water for a long period of time, it may
take some time to wet the transducer after it is returned to the water.
Small air bubbles can cling to the surface of the transducer and
interfere with proper operation. These bubbles will dissipate with time,
or you may wipe the face of the transducer with your fingers after the
transducer is in the water.
1-Year Limited Warranty
We warrant the original retail purchaser that products made by
Humminbird® have been manufactured free from defects in materials and
workmanship. This warranty is effective for one year from the date of
original retail purchase. Humminbird® products found to be defective and
covered by this warranty will be replaced or repaired free of charge at
Humminbird® option and returned to the customer freight prepaid.
Humminbird® sole responsibility under this warranty is limited to the repair
or replacement of a product that has been deemed defective by
Humminbird®. Humminbird® is not responsible for charges connected with
the removal of such product or reinstallation of replaced or repaired parts.
This warranty does not apply to a product that has been:
• Improperly installed;
• Used in an installation other than that recommended in the
product installation and operation instructions;
• Damaged or has failed because of an accident or abnormal
operation;
• Repaired or modified by entities other than Humminbird®.
Please retain your original receipt as a proof of the purchase date. This
will be required for in-warranty service.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY OTHER
WARRANTIES, OBLIGATIONS OR LIABILITIES ON THE PART OF
HUMMINBIRD® AND WILL BE THE CUSTOMER'S EXCLUSIVE REMEDY,
EXCEPT FOR ANY APPLICABLE IMPLIED WARRANTIES UNDER
STATE LAW WHICH ARE HEREBY LIMITED IN DURATION TO ONE
YEAR FROM THE DATE OF ORIGINAL PURCHASE. IN NO EVENT
WILL HUMMINBIRD® BE LIABLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES FOR BREACH OF ANY EXPRESS OR
IMPLIED WARRANTY RELATING TO THE PRODUCTS.
Some states do not allow limitations on an implied warranty, or the
exclusion of incidental or consequential damages, so the above
exclusions may not apply to you. You may also have other rights, which
vary from state to state.
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6. Apply a generous amount of marine-grade silicone sealant or slow-curing epoxy inside the drilled hole
and along the mating surfaces of the transducer housing. Seal the mating edges of the leveling block
(if using one) as well.
7. Insert the transducer into the drilled hole from outside the boat, then install the nut onto the threaded
stem from inside the boat.
NOTE: If you are using a leveling block outside the hull (to correct for deadrise), you must use a similar block
inside the hull to provide a level bearing surface.
8. Tighten the nuts to 10 ft/lbs or use moderate pressure on an adjustable wrench.
CAUTION: Do not overtighten the nuts, especially if you are using a leveling block made of wood, as the block
will swell when wet.
Remove the excess adhesive sealant from the outside of the hull to ensure smooth water flow over the
transducer.
4. Routing the Cable
The transducer cable must be routed to the point where the control head is mounted.
NOTE: Your boat may have a pre-existing wiring channel or conduit that you can use for the transducer cable.
1. Unplug the other end of the transducer cable from the control head.
CAUTION! Do not cut or shorten the transducer cable, and try not to damage the cable insulation. Route the
cable as far as possible from any VHF radio antenna cables or tachometer cables to reduce the possibility of
interference. If the cable is too short, extension cables are available to extend the transducer cable up to a total
of 50'.
2. Route and secure the cable, avoiding areas where it may be damaged or interfere with normal boating
operations.
5. Connecting the Cable
Insert the transducer cable into the appropriate terminal slot. The cable connectors are labeled, and there
are corresponding labels on the cable holder on the rear of the fishfinder. The slots are keyed to prevent
reversed installation, so be careful not to force the connector into the holder.
Your fishfinder is now ready for operation.