My son lost the instruction manual for our DT 500 CH self-adjusting timer made by INTERMATIC INCORPORATED, and we can't even figure out how to turn it on, let alone program it. Any help would be great! Thanks and Merry Christmas! Kirby

I Just downloaded the pdf for the same model. The link to Intermatic is http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/dt500ch.ashx

If that doesn't work then google Intermatic DT500CH pdf and select the return from Intermatic. It's a good timer but not intuitive. I had to look up the manual just to change from daylight savings time.