mozz wrote:Can you have it work every half hour?
It works via two dials. The dial on the left is the one where you choose the overall interval of TIME through which it is to repeat cycle. This left dial is settable from mere seconds (beginning with 15 seconds) on up to 24 full hours. The dial on the right then determines the PERCENTAGE (selectable from zero to 100 percent) of the time selected via the left hand dial for which the device you have tied to the NO (normally open) terminal will be "on". Overall there are 960 different "repeat cycle times"/"percentages of on" that are selectable.
The short answer is therefore "yes". You can set the dial on the left to 30 minutes, and the dial on the right to "operate something" for any desired (and also available) percentage of 30 minutes ranging from zero to 100%.
This is off the top of my head, but I believe the left dial is selectable for 15 seconds, then 30 seconds, then 1 minute through 60 minutes (1 hour), then by whole hours up to 24 hours. The right hand dial is then selectable from 0% through 5% "on" in single percentage increments, then it jumps to 8%, 10%, 15%, 20%, 25%. 30%, 35%, 40%, 50%, 60%, 70%, 80%,90%, 100%.
The "percentage of on" cycle begins at the very beginning of any selected "time" cycle. One oddity that I have already discovered and well noted is that changing any of the dials on the fly while the power is still on automatically begins a new "percentage of on" cycle. Meaning that any changes to the dials trigger the immediate running of the fan in my instance. Also turning the power off and then back on again immediately runs the fan through an "on" cycle. It does not "remember" time (or time already accumulated) when the power is dropped, but rather it merely starts over (beginning with "on") when power is returned or restored to the timer.
Edit: This link is to a chart that gives you all of the 960 selectable time slices: http://www.nsiindustries.com/Repository ... _Chart.pdf
Edit again: Note carefully that the chart has two pages!!!