Airmar SB646 Owner's Manual & Installation Instructions
Follow the precautions below for optimal product
performance and to reduce the risk of property damage,
personal injury, and/or death.
WARNING: Always wear safety goggles and a dust
mask when installing to prevent personal injury.
WARNING: The power must be ‘OFF’ before
proceeding with the installation.
WARNING: The power supply voltage must be 10 - 32
VDC.
WARNING: A safe installation requires a 0.5 amp fast-
blow fuse or circuit breaker.
CAUTION: To reduce electrical interference from
other electrical wiring and any on-board equipment with
strong magnetic fields such as radar equipment, radio
transmitters, boat engines, generators, etc., separate
the cables by at least 1m (3').
CAUTION: Be careful not to tear the cable jackets
when passing them through bulkheads and other parts
of the boat. Use grommets to prevent chaffing. Use
deck glands to prevent water seeping into the boat.
CAUTION: Use a multimeter to check the polarity and
the connections to the power supply before applying
power to the transducer(s).
IMPORTANT: Please read the instructions completely
before proceeding with the installation. These
instructions supersede any other instructions in your
instrument manual if they differ.
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Small Switchbox with Remote Switch
Model: SB646
Applications
• Single transmission line transducers and echosounders only
• Echosounders with power rating of 1kW or less.
Do not use with 2kW echosounders.
• One echosounder can be connected to two transducers. The
transducers must have C32 or C332 cable.
• One transducer can be connected to two echosounders. The
echosounder must be dual-frequency with a single
transmission-line. The transducer must have C32 or C332
cable.
• One echosounder can switch between a wide-beam and a
narrow-beam transducer. Pair a wide-beam SS264W with one of
the narrow-beam models such as: B258, B260, or M260. Both
transducers must have C32 or C332 cable.
Tools & Materials
Safety glasses
Dust mask
Grommets (some installations)
Deck glands (some installations)
Cutting pliers
Phillips screwdrivers
Pencil
Electric drill
Drill bits:
Switchbox
3mm or 1/8"
Remote switch
11mm or 1/2" spade bit
Sandpaper
Weak solvent (such as alcohol)
Wire strippers
Heat shrink tubing
Small blade screwdriver
Pliers some installations)
Adjustable wrench
Cable ties (some installations)
Locating Switchbox, Remote Switch & Cables
IMPORTANT: Be sure to allow an extra 25 cm (10") of cable to
make the connections within the switchbox.
Switchbox—Select a convenient dry mounting location for the
water-resistant switchbox about 1–2m (3' – 5') from the
echosounder(s).
• Retrofit—If the transducer(s) and echosounder(s) are already
installed, select a location with easy access to the cable(s). Be
sure the cable(s) will be long enough to make the necessary
connections. Allow an extra 25 cm (10") for wiring ease.
• New installation—Install the transducer(s) and echosounder(s)
before connecting the switchbox. Plan the cable runs.
Remote Switch—Locate the remote switch on the dash panel or
other convenient location near the echosounder. Check the
backside for any obstructions such as cables and wires.
• Minimum clearance on backside
36mm (1-1/2")
• Maximum panel thickness
6mm (1/4”)
INSTALLATION INSTRUCTIONS
OWNER’S GUIDE &
Copyright © 2011 Airmar Technology Corp.
Figure 1. SB646 Switchbox with remote switch