Bench tested the new actuator today, it works pretty nice. The unit is geared down quite a bit, it takes 150sec. to rotate 95 degrees, it's full rotation. The actuator has a lot of power for it's size, I'll need to attach a lever to it to really see how much power it has. The unit needs a 24VAC power input, and a DC control input, you can either use a 4-20ma or a 0-29VDC control input. In testing I used a fixed 16VDC input, and was able to adjust full open position by the left potentiometer, so it should have variable stop at varying voltage input, I'll test that later tonight. The right potentiometer is for adjustment of feedback voltage, so a signal can be sent from unit to control, that is 0-29VDC. It looks like when using the feedback function from the actuator you have to use 4-20ma to control it. There are multiple configurations for this model. This actuator has a microprocessor to control the speed to maintain the 150sec open/close operation for rotations of 35-95 degrees, 0-35 degrees is a constant speed. If you look closely, you will see 2 phillips head screws around the rotating head, those are adjustable hard stops if your damper doesn't have any. The motor will not be damaged by maintained force against the stops. Hopefully I can change the PDF file of the tech data sheet I scanned so it will be able to be viewed.