For those of us with short chimneys and low draft conditions in the shoulder months a draft inducer may be necessary. I am one of those people with an 18' chimney and trouble keeping a good draw on the stove in temps above 40º. I had purchased a Tjernlund AD-1 draft inducer at the end of last season but did not install it until the beginning of this season. Some things I've noticed about it are, that it does a very good job at creating draft. In fact, it's too good. Out of the box this thing creates a .13" of water draw on my chimney with a 200º fire set on the lowest setting. Too much.
I had purchased a new switch for it hoping it'd allow me a little more control. No go. The motor did not like the Lutron fan switch. So, being a curious person I decided to disassemble the factory switch that came with the blower. You'll notice that it's a cheap Chinese switch encased in a cheap plastic housing. There is a reason why the instructions tell you to keep it away from heat. It'll melt and be rendered useless. Which is why I decided to remove it from the box mounted on the side of the inducer and put it on a long cord and install it in a separate box close to the outlet. The second thing you'll notice is that the black housing has a back plate that is snapped into the sides of it. Using a small screw driver or a razor blade one can easily take the housing apart, exposing the guts of the switch.
Here is the interesting part. If you turn the switch over and look on the opposite side of it; wires should be pointing away from you. You'll see a small potentiometer or pot. It is set very high from the factory. Basically, it gives you "out-the-box" HIGHEST, [/i]HIGH[/b] and [/i]MEDIUM[/b]. So, even on low you are still going to pull well over your .06" of water target. If you turn the pot counter-clockwise you'll increase the speed of the inducer. Basically negating all adjustability with the switch as it would just give you the highest possible setting across the entire range. BUT, by turning it a little bit clockwise you slow the motor which gives you a proper [/i]HIGH[/b] and [/i]MEDIUM[/b] and [/i]LOW[/B].
The easiest way to adjust it is simple. Unplug the switch from the wall, take the switch apart LEAVE IT UNPLUGGED. Adjust the pot in small increments. Take one half of the cover and slide it back on the switch and hold it by the cover; pinch the sides. Plug it back in and turn it on. Make note of where the draft is. Fine tune as needed. Now, I readjusted mine without a fire in the stove. I had shut down, in fact when I was making my adjustments I was only burning some wood and Cowboy Charcoal. I'm not sure if the results will be different with a full blown coal fire. I'd imagine not, though.
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- This is what you are looking for on the side of the switch. Turn counter-clockwise to increase motor speed (increase draft). Clockwise to decrease motor speed (decrease draft).