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[3.2.4] Installing SolarMount rails <br />'UNIRACSolarMountUnirar. Code.-Compliant Installation Mrinlinl U <br />Keep rail slots free of roofing grit or other debris. Foreign mattef will <br />cause bolts to bind as they slide in the slots. <br />/ <br />41A <br />Installing Splices: If your installation uses SolarMount splice bars, attach 4<%43#,-R #2'.4* 13the rai]s rogethet (Fig. 13) before mounting the rails to the footings. Use <br />splite bars only with flush installations or i:hose thatuse 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 .47 <br />spiice. (Reference installation manual 908, Splices/Expansion Joints.)Figure 13. Splice bars slide into thefooting bolt <br />slots Of SolarMount rail. sections. <br />#i «49:9.7Ah <br />Mounting Rails on Footings: Rails nlay be attached to either of two <br />mounting holes in the 1-feet (Fig. 14). Mount in the lower hole for a low. <br />profile, more Resthetically pleasing installation. Mount in the upperhole <br />for a higher profile, which will maximize air flow under the modules. Thi$ <br />will cool them more and may enhance performance in hotterdimates. <br />ClampingSlide the %-inch mounting bolts into the footing bolt slots. Loosely attath bolt slotthe 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./r- Mounting <br />qi Slots <br />Footing: <br />bolt slotAligning the Rail End: Align one pair of rail ends to the edge ofthe <br />installation area (Fig. 15 or Fig. 16). <br />The opposite pair of rail ends will overhang the side of the installation <br />area. Do not trim them off until the installation 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 />cab be aligned, but the first module must be installed at the aligned end. <br />If the rails areparallel to the raft:ers (Fig. 16), the aligned end of the rails <br />must face the lower edge ofthe 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 raUs within a.few hours if module placement is <br />delayed. <br />Edge :of Instqllation area -- <br />m EE <br />1 -- I.- ../.-Il. <br />Edge of installation area <br />Agure 15. Rails perpendicular to therafters Figure 16. Rails pnrallel to the rafters. <br />-- .1- - - <br />. <br />Nze <br />19