LiftMaster MAT Owners Manual - Page 6
Installation
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INSTALLATION » INSTALL THE CONCRETE PAD AND CONDUIT INSTALL THE CONCRETE PAD AND CONDUIT Check the national and local building codes before installation. 1 Layout the concrete pad for the operator. The concrete pad should be approximately 24" x 24" x 24" in order to ensure proper and stable operation. The pad should be 6" above the finished grade or even with top of curb (if applicable). NOTE: Pad should always extend below frost line in regions where ground will freeze. 2 Install the conduit. The conduits should be installed to fit the 3-1/2" x 3-1/2" opening in the pedestal base plate or the 10-1/4" x 8-1/4" opening in the tower base plate. The operator should be centered on the pad and spaced approximately 6" from the edge of the pad on drive way side (in order to get the most reach out of arm). Install conduits for the 120/230 Vac main power, low voltage control wiring, and one or two extra for loop sensor leads. Conduit size should be limited to 1/2" when possible to reduce crowding if more than four are needed. All conduits must be UL approved. 3 Pour a concrete pad (reinforced concrete is recommended). 24" 6" 18" 24" TOP VIEW OF PEDESTAL FOOTPRINT (concrete pad) 8" 2" 12" 5-1/2" 8" 5-1/2" 6" 3-1/2" 12" 9" 8" TOP VIEW OF TOWER FOOTPRINT 5-1/4" 7-1/8" (gate arm bracket) 7-1/8" (concrete pad) 3-1/2" 9-7/8" 13-1/2" 10-1/4" 8-1/4" 6" 5-1/4" (door) 12-1/4" 14-1/4" 6