Can someone tell me how to create multiple on/off times daily in a single program. I'd like my thermostat to maintain different temperatures based on time of day. I haven't been able to figure out how to do this in my ISY-99i. Thanks.

You can use the Then clause to set one group of temp settings and the Else clause to set another group of temp settings. If more than two groups of settings are desired more than one program is required.

 

If
       From     9:00:00AM
       To       5:00:00PM (same day)

Then
  - No Actions - (To add one, press 'Action')

Else
  - No Actions - (To add one, press 'Action')

 

The Then clause would contain the temp settings for 9 AM to 5 PM. The Else clause would contain the temp settings for 5 PM to 9 AM.

Lee tells it pretty well, but just a littel extra tidbit, you can set the if clause to be from time a to b OR time c to d. . .and so on. The basic jist is that you can only have two temp settings in one program, but many time slots to be set to one or the other.