Schlage M490 - Page 4

4
2 Install MBS indicator (optional, plus models ONLY).
2a Remove cover. 2b Drill hole for MBS indicator.
Bottom
0.75"
(19 mm)
¹⁄₄" (6 mm) drill bit
M420: 0.50" (13 mm)
M450/490: 0.75” (19 mm)
0.25"
(6 mm)
hole
2c Install MBS indicator.
3 Install ATS (optional, plus models ONLY)
3a Remove end block and wiring cover.
a
c
b
3b Install ATS and Reassemble
d
e
f
ATS