Chamberlain MADCBB - Manual (Page 6)

6
INSTALL THE CONCRETE PAD AND
CONDUIT
Check the national and local building codes before installation.
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.
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.
Pour a concrete pad (reinforced concrete is recommended).
INSTALLATION »
INSTALL THE CONCRETE PAD AND CONDUIT
1
2
24"
24"
18"
6"
3
TOP VIEW OF PEDESTAL FOOTPRINT TOP VIEW OF TOWER FOOTPRINT
8"
12"
12"
8"
8"
5-1/2"
3-1/2"
5-1/2"
6"
9"
2"
5-1/4"
5-1/4"
13-1/2"
3-1/2"
7-1/8" 7-1/8"
10-1/4"
8-1/4"
9-7/8"
12-1/4"
14-1/4"
(door)
(gate arm bracket)
(concrete pad) (concrete pad)
6"