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SolarMount Unirac Code-Compliant Installation Manual :FUNIRAC <br />Keep rail slots free of roofing grit or other debris. Foreign matter will <br />cause bolts to bind as they slide in the slots. <br />[3.2.4] Installing SolarMount rails a <br />Installing Splices: If your installation uses SolarMount splice bars, attach <br />the rails together (Fig. 13) before mounting the rails to the footings. Usesplice bars only with flush installations or those that use low-profile tilt , <br />legs. <br />Although structural, the joint is not as strong as the rail itself. A rail should <br />always be supported by more than one footing on both sides of the W <br />splice. (Reference installation manual 908, Splices/Expansion Joints.) <br />figure 13. Splice bars slide into thefooting bolt <br />slots ofSolarMount rail sections. <br />Mounting Rails on Footings: Rails may be attached to either of two <br />mounting holes in the L-feet (Fig. 14). Mount in the lower hole for a low <br />profile, more aesthetically pleasing installation. Mount in the upper hole <br />for a higher profile, which will maximize airflow under the modules. This <br />will cool them more and may enhance performance in hotter climates. <br />Slide the 7,-inch mounting bolts into the footing bolt slots. Loosely attach <br />the rails to the footings with the flange nuts. <br />Ensure that the rails are oriented to the footings as shown in Figure 8,9, <br />11, or 12, whichever is appropriate. <br />Clamping <br />bolt slot <br /><«r Mounting <br />Aligning the Rail End: Align one pair of rail ends to the edge of the <br />installation area (Fig. 15 or Fig. 16). <br />slots <br />Footing - <br />bolt slot <br />The opposite pair of rail ends will overhang the side of the installation -€== <br />area. Do not t:rim them off until the inst:allation is complete. <br />If the rails are perpendicular to the rafters (Fig. 15), either end of the rails Figure 14. Foot-to-rail splice attachment <br />can be aligned, but the first module must be installed at the aligned end. <br />If the rails are parallel to the rafters (Fig. 16), the aligned end of the rails <br />must face the lower edge of the roof. Securely tighten all hardware after <br />alignment is complete (20 ft lbs). <br />Mount modules to the rails as soon as possible. Large temperature <br />changes may bow the rails within afew hours if module placement is <br />delayed. <br />Edge of installation area - <br />[I] i . IE [9 <br />1 --- <br />.....1 Edge of installation area <br />Figure 15. Rails perpendicular to the rafters.Figure 16. Rails parallel to the rafters. <br />0 <br />Page <br />19