User manual STANDARD HORIZON B744VL

[. . . ] OWNER'S GUIDE & INSTALLATION INSTRUCTIONS TRIDUCER® Multisensor with Valve Models: B744V, B744VL, B66V, B66VL, and SS544V U. S. Japanese Patent 1851014. Record the information found on the cable tag for future reference. Part No. _________________Date___________Frequency________kHz B744V IMPORTANT: Please read the instructions completely before proceeding with the installation. These instructions supersede any other instructions in your instrument manual if they differ. 11/03 B744V Standard Fairing 17-118-03 rev. 03 WARNING: B744V and B744VL These models must be installed with a fairing (standard or high-performance). [. . . ] Slide the fairing (if used) onto the stem and mate the button with the recess in the housing (see Figure 5). Apply a 2mm (1/16") thick layer of marine sealant to the side of the fairing (if used) that will contact the hull (see Figure 3). Apply a 2mm (1/16") thick layer of marine sealant to the side of the backing block (if used) that will contact the hull. marine sealant Figure 3. Drilling and bedding (B744V shown) band saw table cutting guide Installing the Housing Caution: Never strike the multisensor. 1. From outside the hull, push the stem of the multisensor housing (with the fairing in place if used) through the mounting hole using a twisting motion to squeeze out excess sealant (see Figure 3). If an Airmar fairing is used, be sure the button on the fairing is mated with the recess in the multisensor, the arrow on the fairing is pointing forward. Take care to align the assembly parallel to the centerline of the boat (see Figure 5). From inside the hull, slide the backing block (if used), hull nut, and cap nut along the cable. Slide the backing block onto the stem and seat it firmly against the hull. Wood hull--Allow for the wood to swell. deadrise angle fence end with arrow for installation on port side Figure 4. Cutting the fairing AIRMAR ® AIRMAR ® BOW cutting guide Caution: Be careful to avoid cross threading the cap nut. 3. Being sure the valve assembly is seated firmly in the housing, carefully screw the cap nut in place. Remove any excess sealant on the outside of the fairing and hull to ensure smooth water flow over the multisensor. button recess in housing Figure 5. Airmar urethane fairing (B744V shown) 3 AIRMAR ® top view of paddlewheel insert Warning: Always attach the safety wire to prevent the insert from backing out in the unlikely event that the cap nut fails or is screwed on incorrectly. 5. Wrap one end of the safety wire tightly around the stem of the housing and twist it together with the long end. After the sealant cures, inspect the O-rings on the paddlewheel insert and lubricate them with the silicone lubricant supplied. With the arrow on the top of the paddlewheel insert pointing forward toward the bow, slide it into the housing with a twisting motion until it is fully seated. (The insert fits one way only. ) Take care not to rotate the outer housing and disturb the sealant. Wrap the safety strap around the cable and pass the holed end through the slit in the opposite end. 4 retaining pin cap nut safety ring stem safety wire hull nut hull backing block fairing multisensor Figure 7. Installation (B744V shown) AIRMAR ® Dimension equal to the thickness of the hull's outer skin to ensure adequate clearance inner skin pour in casting epoxy core Paint the following surfaces (see Figure 9): · Exposed areas of the housing including the acoustic window · Bore of the housing up 30mm (1-1/4") · Outside wall below lower O-ring of paddlewheel insert · Paddlewheel cavity · Paddlewheel · Blanking plug below lower O-ring including exposed end Operation, Maintenance, Repair, & Parts hull outer skin solid or hollow cylinder How the Valve Works The multisensor incorporates a self-closing valve which minimizes the flow of water into the vessel when the paddlewheel insert is removed. The curved flap valve in the valve assembly is activated by both a spring and water pressure. [. . . ] Seat it in place with a twisting motion until the keys fit into the notches. Secure the paddlewheel insert with the retaining pin and safety ring (see Figure 7). Servicing the Paddlewheel Insert The water lubricated paddlewheel bearings have a life of up to 5 years on low-speed boats [less than 10kn (11MPH)] and 1 year on high-speed vessels. Paddlewheels can fracture and shafts can bend due to impact with water borne objects and mishandling in boat yards. O-rings must be free of abrasions and cuts to ensure a watertight seal. [. . . ]