Schlage M420 - Install Optional Features

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