GArage door opener?

[zeekh]

I bought 2 of the Chamberlain B890 garage door openers when they were on clearance. I comes with an automatic garage door lock 841CB but the instructions say only install on torsion spring garage doors. I contacted Chamberlain via email and they said its OK to install on extension spring doors. I'm curious if anyone has had any problems doing this and if they know the reason Chamberlain doesn't recommend installation on extension spring doors.

 

[kbs2244]

If they said it was O K it would go with it
I do not think the opener will care

The printed stuff is alll lawyer approved and they are scared of extension springs and DIY

 

[mkef]

The biggest problem with extension springs is that either side of the door came move independently of the other side as there isnt a shaft connecting each side.

As long as the door runs good I dont see an issue. I would never run one on mine but mine is a p.o.s.

Did you mean b980?

 

[lml999]

Is the warning for the opener or the lock? I browsed the directions for the opener and didn't see any warnings. Can't imagine why the opener would care. I have two similar belt drive Chamberlains on doors with extension springs.

If it's specifically for the automatic lock, perhaps Chamberlain is concerned about the door opening with the lock in place. The torsion springs are well contained if they break. The springs *should* be well contained with a cable running through them...but if not...

 

[nadogail]

IMHO, The company has been advised to cover themselves in case a poorly installed Garage Door Garage Door Opener fails.

 

[zeekh]

The biggest problem with extension springs is that either side of the door came move independently of the other side as there isnt a shaft connecting each side.

As long as the door runs good I dont see an issue. I would never run one on mine but mine is a p.o.s.

Did you mean b980?

YEs.

Door is only 2 years old. I installed the opener and love it. Especially the battery backup. I haven't gotten the wifi part up yet because signal to garage is poor.

 

[zeekh]

Is the warning for the opener or the lock? I browsed the directions for the opener and didn't see any warnings. Can't imagine why the opener would care. I have two similar belt drive Chamberlains on doors with extension springs.

If it's specifically for the automatic lock, perhaps Chamberlain is concerned about the door opening with the lock in place. The torsion springs are well contained if they break. The springs *should* be well contained with a cable running through them...but if not...

The warning is for the automatic lock. Not the garage door. Not sure how the automatic lock would effect the spring. If it breaks it breaks. I did contact Chamberlain via email. They said the lock was fine for a extension spring. That said, then why do the installation instructions say to use only with torsion spring doors. ANyway, I'm going to install the lock. I just wanted to see if I was overlooking something so I asked here.

Tahnks everyone for the input

 

[firebirdparts]

The warning is for the automatic lock. Not the garage door. Not sure how the automatic lock would effect the spring. If it breaks it breaks. I did contact Chamberlain via email. They said the lock was fine for a extension spring. That said, then why do the installation instructions say to use only with torsion spring doors. ANyway, I'm going to install the lock. I just wanted to see if I was overlooking something so I asked here.

Tahnks everyone for the input

It's the other way around; the lock affects the torsion spring shaft indirectly. If the lock stays locked, it'll stop the torsion shaft, and by necessity it stops both ends at the same time. The manufacturer must have thought that was a less bad thing. Still gonna put a hurtin' on the door either way if it screws up, but less of a hurtin'. Lots of ways to mangle the top of a door.

I am just making that up.