LiftMaster 772E Mode D'emploi page 3

Attention:
• Installations on slopes or slanted driveways require very precise work.
• Avoid cable lengths of more than 10 m.
• Low angle sunshine or under-sized cables can greatly reduce the range.
• If 2 photocells are installed close to each other with little distance between them (e.g. for sliding
doors), the receiver and transmitter should not be mounted on the same side of the entrance, or
else one transmitter (TX) can influence both receiver lenses.
ASSEMBLY
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Before installing the photocell, the power supply must be shut down.
1. Press in the latch with a suitable screwdriver and open the housing (Fig. 1). This snap
mechanism enables quick installation. Keep the housing open during the installation so that the
diagnosis of the LED can be seen.
2. Mount and align transmitter and receiver accordingly. Use at least 2 screws for attaching the
transmitter and receiver, and ensure that the cable routing is executed properly (Fig. 6). Align
the sensors in such a way that the lenses precisely face each other parallel to the door. There
is a bracket for the lens inside the 772E, which enables an optional alignment (Fig. 3b). After
alignment, tighten the two screws (8) (Fig. 7).
3. The connection cable must be laid in accordance with local building and electrical regulations.
High and low voltage lines are not to be laid together in a single cable; it leads to malfunction.
4. Connect the cable (min. 2 x 0.5 mm2) to the terminals according to the controller.
a. Garage door opener: Selection of the model based on the images (a-f).The connection is
done according to the wiring diagram.
b. Swing and sliding door operators: Selection of the model based on the images (g-m). The
connection is done according to the wiring diagram.
5. After connecting the photocells, operate the drive.
a. LED on both transmitter and receiver lights up, if the connection and alignment were
executed properly.
b. LED flashes on transmitter and receiver, if the infrared beam is interrupted, or if the alignment
is not correct. Remove obstruction or re-align until the LEDs stop flashing.
6. Close the housing of the photocell.
INITIAL OPERATION AND TESTING OF PHOTOCELLS
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• Open the door with the remote control or a switch.
• Place an obstacle between the transmitter and receiver to interrupt the infrared beam.
• Operate the remote control or switch again to start the closing process. The garage door must
not close now, since the infrared beam is interrupted. There is a red LED below the housing of
the 772E (which is not visible with closed housing), which flashes when the infrared beam is
interrupted, thus indicating that there is an obstacle between the transmitter and receiver, or
that the lenses are not aligned correctly. If the garage door closes even the infrared beam is
interrupted by an obstacle or if the transmitter and receiver are not aligned correctly, the
system must be checked immediately by an authorised technician.
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