LiftMaster850LM Universal Gate and Garage Door Opener Receiver

This unit uses relays and can operate up to 3 operators. What this means is there is a mechanical switch inside and it'll run any garage door opener that can use a wall button. I opted to wire in a 12 volt transformer to power mine. Just connect the relay contacts to the operator where you would a wall button (you can keep the wall button as well). I'm using mine to run 2 garage door operators.This wireless system works separately from your garage door opener - so you'll be directly "learning" or teaching the 850LM your remotes - so if you have older remotes that don't work with the liftmaster yellow learning button you'll need to upgrade to a Security + 2.0 remote.You can mount it near your garage door operators where you have power available (If you choose to use a transformer for power) and you don't have to make long wire runs for the trigger wires to the operators. Couple this convenience with the ability to relocate its antenna to the exterior of your building (especially if you have a metal building that blocks the signal) and your range should improve drastically. Use a simple coax cable and put the antenna outside.Or you could opt to put the 850LM in a more easily accessible location so you can reach your learn buttons more easily... just run wires accordingly.

I bought an 850LM to solve a reliability/spotty coverage problem with the receiver built into my circa 2002 Chamberlain Model 8220 garage door opener. Using the Homelink built into our 2017 RAV-4, sometimes the remote wouldn't trigger from the driveway, but other times it would trigger fine from three houses down the street.It took a couple tries to get a good configuration. The easiest install method is to power the 850LM from the existing garage door opener. I could not find an explicit opener/850LM compatibilty guide. You will need some hookup wire and wire nuts to splice in. The voltage levels looked OK, but 850LM respond to its buttons after I powered up. I disconnected the power wires and plugged in a wall plug power supply from some computer peripheral. There's an input power jack on the 850LM, so no additional wiring or splciing required. You can also buy a Chamberlain wall plug specifically designed for the purpose.You will also need some wire to connect the 850LM Normally Open (NO) relay to the NO terminals of the garage door opener. Basically the garage door opener thinks the 850LM is just another doorbell-type switch. You can place as many doorbell swithes in parallel as you desire. The terminal space on my garage door opener was pretty crowded, so a little bit of splicing and wire nuts were called for again.Follow the internet instructions on setting up Homelink. To do it right, you need at least one additional remote (811M for example) to train you in-car Homelink transmitter.After completing the installation, my RAV-4 still had inconsistent spots in receiver coverge. Unlike the original garage opener receiver and antenna, the 850LM has a nice F-style antenna connector allowing you to remotely place the receiver antenna for better range. You'll need some TV cable with F-connectors and a F-union to connect the 850LM antenna to the end of the extending cable.After these tweaks, the 850LM is now working well, with good range and no need to disturb operation of the previous system. In addition to what was in the 850LM box, the job needed hookup wire, wire nuts, television cable, an F-type union connector, and an 811M remote. I would still consider this an easy installation job once you have the parts on hand.

All the frequencies, brand compatibility and code types get confusing. First - the operator - some just don't play nice with 3rd party receivers. Most do. I needed to replace a failing remote system that was attached to my Allstar operators. They are nothing fancy and have no special requirements. Connecting/shorting two terminals on them with a button switch on the wall will operate them --- connecting two different terminals on them with the receiver (radio relay) will operate them. You can check this with a piece of wire and the pin-out diagram from your operator manual. I went with all LiftMaster products for radio control. This 850LM receiver controls two Allstar garage doors operators for me. It has a yellow learn button and is Security+2.0 compatible. I power it with an 85LM power cube (but I could have fed it 20V directly from one of the operators as well.) I also bought an 877MAX keypad, an 890Max keychain remote and a 893MAX visor clip remote and all of them successfully paired to it. The remotes (not the keypad) have multiple buttons for multiple channels - and each remote has a button assigned to one of my doors and another button assigned to the other. When I get a chance, I will pair the third button on each remote to the third channel on the 850LM receiver and do some additional wiring so it opens both doors at the same time. This group of devices all work flawlessly together. I also took one of the remotes out to the car to train/pair the HomeLink in both of our cars to this 850LM receiver. Just follow any HomeLink tutorial on YouTube to use a remote to train your vehicle. If the instructions do not mention pressing the pairing button on the receiver as part of the process, the instructions are incomplete. The HomeLink in the vehicle will appear to clone your remote by flashing rapidly. However, you will find it produces a steady light and still won't open the door. A good tutorial will explain how you ALSO must go and press the yellow learn button on the receiver for the correct door/channel and then go back and finish the process. Pairing to HomeLink is one thing - but you must also sync the HomeLink with the receiver to deal with rolling codes. Hope this saves someone the time I spent picking out these items and getting them to work together.