Thanks again everyone. After confirming that all systems work when connected to the original thermostat, and that my didital thermostat is no longer working correctly (likely due to my miswiring), I reread your posts and other threads on the subject. I have ordered the Honeywell TH5110. I'm attaching a pic of the way I think it should be wired. Your comments on my hand drawn schematic will be appreciated.
__________________
|