Question for the pro' elderly woman wants to replace her 3 chrono 3's for simpler stats. Basically she is having a hard time understanding/setting the stats an we all now the complexities of these. So me having little to no exposure to zone stats and always use chrono4's. Does any stat with O and B terminals work on a durazone system... looking at specifically W/R 1F78-144. Will this work and is it a good t-stat?? And what specifically are these terminals doing on the master stat?

Also anyone have issues with the chrono4 power robbing stat with durazone....seems the slaves will loose power sometimes an not work? Switched them all out for ones with batteries and no issues.

tks for any info