> So the electric motor is just overcoming that last bit of resistance to get the door started on it's upward movement and the springs do most of the work. But I'm thinking the motor must work hard though closing the door maybe? It is actually winding those springs up again for the next lift. But the door weight helps with that I think. Maybe someone could comment on that part?
Generally speaking, if an opener is not installed the springs are adjusted a little tighter so the door is easier to open by hand.
Note that the weight of the door is not constant, since the horizontal tracks support progressively more of the door as it rises. And of course the spring force decreases as the springs unwind. When a door is properly adjusted without an opener, it will almost go up by itself once it's open two or three feet. And when it's down below one or two feet it should go ahead and close by itself.
When adjusted for an opener, the door is always pulling downward. The opener should only have to push downward to overcome friction. There is a downward force adjustment that will cause the door to reverse if it strikes something. If the downward force and down limit are adjusted properly, the opener will stop when the door touches the threshold, but will reverse if it strikes a 2x4 laid flat on the threshold.
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