User manual STANDARD HORIZON B240 INSTALL GUIDE

[. . . ] It can be shaped to accommodate a deadrise angle of up to about 25°. (For fairing part numbers, see "Replacement Parts" on page 4. ) A backing block is mounted inside the hull to provide a level surface for the hull nut to seat against (see Figure 2). After cutting an Airmar fairing, use the remaining section with the cutting guide for the backing block. Airmar High-Performance Fairing A high-performance fairing has a long streamlined shape for excellent performance above 15 kn (18MPH) (see "Parts" on page 4). Mounting Location Acoustic Noise Acoustic noise is always present and these sound waves can interfere with the operation of the transducer. Background noise from sources such as: waves, fish, and other vessels cannot be controlled. [. . . ] · Planing hull powerboat--Mount well aft, near the centerline, and well inboard of the first set of lifting strakes to insure that the transducer is in contact with the water at high speeds. Outboard and I/O--Mount just forward and to the side of the engine(s). Boat capable of speeds above 25kn (29MPH)--Review transducer location and operating results of similar boats before proceeding. 2 hull nut hull backing block slope of hull fairing thickness 6­12mm (1/4­1/2") deadrise angle parallel to waterline standard fairing marine sealant Figure 2. If a fairing is used, seat the transducer firmly in/against the fairing with a pushing twisting motion. Apply a 2mm (1/16") thick layer of marine sealant to the surface of the fairing that will contact the hull. Apply a 2mm (1/16") thick layer of marine sealant to the surface of the backing block that will contact the hull deadrise angle fence arrow end for installation on port side Installing 1. With the fairing in place (if used) and the arrow pointing forward toward the bow, push the stem of the transducer through the mounting hole (see Figure 4). (A symmetrical fairing can be oriented either way. ) Take care to align the assembly parallel to the centerline of the boat. From inside the hull, slide the backing block (if used) and hull nut onto the cable. Screw the hull nut in place and tighten it with slip-joint pliers (see Figure 2 or 5). Remove any excess marine sealant on the outside of the hull and fairing to ensure smooth water flow over the transducer. Figure 3. Cutting the standard fairing Cutting the Fairing High-performance fairing--For your safety it is mandatory to follow the Installation Instruction Supplement that comes with the fairing. Measure the deadrise angle of the hull at the selected location using a digital level, or bubble level and protractor (see Figure 2) 2. Tilt the band saw table to the measured angle and secure the cutting fence (see Figure 3). Place the fairing on the table so the cutting guide rests against the fence. The arrow will be pointing toward you for installation on the port side and away from you for installation on the starboard side of the boat (see Figures 3 and 4). (A symmetrical fairing can be oriented either way. ) Be sure to orient the fairing on the band saw so the angle cut matches the intended side of the hull and not the mirror image. 4. The fairing must be between 6­12mm (1/4­1/2") at its thinnest dimension (see Figure 2). Warning: Always wear safety goggles and a dust mask. Shape the fairing to the hull as precisely as possible with a rasp or power tool. Use the remaining section of the fairing for the backing block. Caution: If the transducer came with a connector, do not remove it to ease cable routing. If the cable must be cut and spliced, use Airmar's splash-proof Junction Box 33-035 and follow the instructions provided. [. . . ] If a leak is observed, repeat "Bedding" and "Installing" on page 3 immediately. Caution: Completely seal the hull to prevent water seepage into the core. Coat a hollow or solid cylinder of the correct diameter with wax and tape it in place. Sand and clean the area around the hole, inside and outside, to ensure that the sealant will adhere properly to the hull. SS505 shown Maintenance & Replacement Cleaning Aquatic growth can accumulate rapidly on the transducer's surface reducing its performance within weeks. [. . . ]