Chamberlain LM550EVGBSA, Installation And Operating Instructions Manual, Page: 19 / 44

18
white
white/black
24 vdc
com
External
Receiver
Wired Wall Button
com n/o
4 3 2 1
IR Beams
green (4) grey (3) white (2) red (1)
TYPICAL WIRING DIAGRAM WEATHERDRIVE LM 550EV
Information for Service Personnel
2
5
OPTIONAL ACCESSORIES
1. Model 128
EV
2 Channel wireless wall button
2
. Model
TX4UNI
4 Channel transmitter
3
. Model
747EV keyless entry system
4
. Model
760EV outside keyswitch
5
. Model
1702EV outside quick release
6
. Model
771EV IR beams
2
4
6
3
5 4
2
1
NOTE: Only genuine Liftmaster accessories are approved for use with this opener. Generic compatible accessories are
NOT approved for use with this opener
.
NOTE: The terminal block is weather protected by a rubber grommet.
When using external wiring, the cable holes can be punched through with a small screwdriver. These
holes should be sealed with silicon sealant in order to maintain the weather proof rating.
7. Model 828EV Internet gateway, allows operating your
door opener via internet or a compatible
mobile phone.
7