Yours is actually very similar to my first design. I went this route because I couldn't figure out a way to add a manual for/rev. without causing a backfeed. I may be wrong (I won't receive my timer unit until next Thursday) but I don't think it has a manual switch. I sent the first timer I posted back because it was A,B but there was no delay between the 2 and my plan is to set up a screw type shaft for the turner. The new timer is A C B D. A and B are built in relays (SPDT) 1 and 2. C and D are no output timers between A and B. So A would be set to kick on x seconds and limit out. C would kick on (no output) for 1 hour. B would kick on x seconds and limit out. D would kick on (no output) for 1 hour. This timer has both single shot and continuous cycle. I went with a screw type shaft because I plan on mounting the motor outside the incubator. With all that being said if it turn out this new timer does have a manual switch, life becomes much easier. lol.