Chamberlain Garage Door Opener 2C507 2 User Manual

Garage Door Monitor  
Models 915LM • 916LM • 2C507-2  
Know when your garage door is open  
or closed!  
Thank you for purchasing the LiftMaster Garage Door Monitor.  
Monitor the status of your garage door from inside your home.  
No longer will you have to run downstairs or go outside just to  
see if you or your children have left the garage door open.  
WARNING  
To prevent possible SERIOUS INJURY or DEATH from a closing  
garage door:  
• Activate door ONLY when it can be seen clearly, is properly  
adjusted, and there are no obstructions to door travel.  
• ALWAYS keep garage door in sight until completely closed. NEVER  
permit anyone to cross path of closing garage door.  
GARAGE DOOR  
MONITOR SYSTEM  
NOTE: Because radio control devices are inherently  
susceptible to RF interference, this product should NOT be  
used as a stand-alone security device. This product is  
considered a monitoring and notification device ONLY, and as  
such, should not be used as a substitute for a dedicated home  
security system.  
CLOSED  
Transmitter  
AC Adapter  
OPEN  
To ensure that your Garage Door Monitor continues to operate  
properly, the following checks should be performed on a  
monthly basis:  
• Check that the transmitter is mounted properly on the garage  
door (see “Mounting the Transmitter” section of this manual.)  
• Ensure the 3 volt lithium battery is installed properly.  
• Check to see that the receiver system is plugged into a wall  
outlet and the jack is properly connected to the back of the  
receiver. Make sure the antenna is straight and not in contact  
with any metal objects.  
CR2032  
3
VOLTS  
Lithium Battery  
(CR2032 type)  
Double-Sided Velcro  
Indoor Receiver  
PRE-INSTALLATION SYSTEM TEST  
1. The transmitter and receiver are pre-matched (programmed)  
at the factory. Test the system by flipping the transmitter over  
while it is a few feet away from the receiver. The receiver will  
show a green light for closed when the transmitter is face up  
in the vertical position with the round end of the case  
• Check that the receiver is properly recognizing transmitter  
signals (see “Troubleshooting” section of this manual.)  
pointing down (Figure 1). The red light will flash when the  
transmitter is face down in the horizontal position (Figure 2).  
INSTALLING THE BATTERY IN THE GARAGE  
DOOR INDICATOR TRANSMITTER  
2. If the green or the red receiver lights do not come on, or do  
not react as described, see the Troubleshooting or Learning  
section of these instructions.  
1. Place the screw driver blade on the tab at  
the end of the case and gently press down  
and in toward the case.  
Figure 1  
Figure 2  
2. Insert the the lithium battery into the battery  
clip with the + (positive) side face up.  
3. Push the case back together tightly by  
inserting the top hooks into the back cover,  
then snap shut the bottom of  
the case.  
MOUNTING THE TRANSMITTER  
NOTE: It is normal to hear a rattle from the tilt  
Attach the transmitter to the inside of the garage door using the  
double-sided velcro. Mount the transmitter near the top of the  
garage door for best results. The round end of the case should  
be pointing down when the garage door is closed.  
switch in the transmitter when tilted or rotated to another position.  
INDOOR RECEIVER SETUP  
1. Plug the AC adapter into any  
standard 110 volt AC electrical  
wall outlet and the small plug  
into the back of the indoor  
Double-Sided Velcro  
Antenna  
Learn  
CLOSED  
OPEN  
receiver.  
Button  
2. The receiver has a 9" antenna  
wire which comes out the  
back. The antenna should be  
straight and not touching  
metal.  
AC  
Adapter  
Location  
Round End  
Down  
Inside of Garage  
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