Installation; Concrete Pad; Anchors; Conduits - Chamberlain MEGA ARM / MEGA ARM TOWER Installation And Service Manual

CONCRETE PAD

The concrete pad for operator mounting should be approximately
24"x24"x24" in order to provide adequate weight and structure to
insure proper and stable operation. Pad should be 6" above
finished grade or even with top of curb if one is present. (NOTE:
Pad should always extend below frost line in regions where
ground will freeze.)
ANCHORS (MOUNTING UNIT)
Proper anchors for fastening operator to pad will be a 1/2"x6"
wedge anchor patterned to match the mounting base of the unit.
They should be installed with approximately 1 1/4" showing above
concrete surface in order to allow for the 1/2" thick base plate as
well as washers for leveling.
NOTES:
• For automotive use only, no motorcycles, bicycles or
pedestrians.
• Heater option MUST be used if temperature is 30°or below.
• Heater option available for 120 Vac units only. See accessory
page for heater part number.

CONDUITS

Conduits should be restricted to fit the 3 1/2"x3 1/2" opening in
pedestal base and 10 1/4" x 8 1/4" for the tower base. Location on
pad should be centered and spaced approximately 6" from edge
of pad on drive way side (in order to get the most reach out of
arm). Separate conduits to be included should be 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.
TOWER CABINET DIMENSIONS
42"
13-1/2"
14-1/4"
I N S T A L L A T I O N
13-1/2"
3-1/2"
42"
36-1/2"
Side View
UNIT DIMENSIONS
15-3/4"
20-1/4"
41-1/2"
5" 4"
17-1/2"
9"
Center Line
These Dimensions Will Center
the Operator on the Pad
Pedestal Foot Print of Base on Pad
Pad (24" x 24" x 24")
Gate Arm Bracket
7-1/8"
9-7/8"
8-1/4"
Tower Foot Print of Base on Pad
6
3-1/2"
13-1/2"
20-1/4"
21-1/2"
8"
Pad (24"x24")
8"
12"
2"
5-1/2"
3-1/2"
3-1/2"
Inside Post
9"
12"
3-1/2"
7-1/8"
10-1/4"
Open Area In
13-1/2"
Base For Conduit
12-1/4"
Door
14-1/4"
41-1/2"
36-1/2"
5-1/2"
8"
6"
3-1/4"