Chamberlain Professional 420LM Owner's Manual

Lift-Master
The Professional Line
SPECIFICATIONS
Output Rating........3 Amps 120VAC or DC Max.
Power..................................18V to 35V, @ 30ma
RF Frequency.........................................390MHz
If the power is other than shown in specifications,
Accessory Transformer Model 85 is required.
Model 86 Coaxial Cable Kit is also available.
Accessory Transmitters -- Series 50, 60, 70 and 80.
WARNING
Disconnect power to opener before installing
receiver or removing/replacing receiver cover.
The receiver and antenna use TV Type F coaxial connectors. The antenna can be plugged onto the receiver or
mounted to a bracket and connected to the receiver with Model 88 Coaxial Cable Kit, depending on your requirements.
Select a location for the receiver which allows access to the terminals and space for the antenna (as far from metal
structures as possible and preferably with the antenna in an upright position). Fasten the receiver securely with screws
through tow holes provided in the cover flanges.
FIGURE 1 -- WITHOUT TRANSFORMER: Connect
bell wire (not supplied) to receiver terminals 1 and 2, and
to opener radio power terminals. All receiver terminals
are unpolarized.
Also connect bell wire to receiver terminal 4 and opener
terminal 2. Make a jumper wire connection to receiver
terminals 1 and 3 as shown.
Side 2 contains code setting instructions, as well as instructions for changing output duration and voltage setting.
Universal Receiver
OWNERS MANUAL
To comply with FCC/IC rules, adjustment or modification of receiver
and/or transmitter is prohibited, except for changing the code setting
and replacing the transmitter battery. THERE ARE NO USER
SERVICEABLE PARTS.
Children operating or playing with a garage
door opener can injure themselves and others.
The garage door could close and cause serious
injury or death. Do not allow children to
operate the door control push button or the
remote control transmitters.
Install the receiver (and all door control push
buttons) out of the reach of children and away
from all moving parts of the door and door
hardware but where the garage door is visible.
FIGURE -- WITH TRANSFORMER MODEL 85:
Receiver terminals 1 and 2 are not used. Connect bell
wire to receiver terminals 3 and 4 and to opener
terminals used for push button controls. The
transformer plugs into 120V outlet.
Model 420LM
WARNING