1. K

    Moving from HAI OmniStat to Aprilaire 8800 on Elk M1

    Background: 15 years ago we got 9 HAI OmniStat (1st-gen) thermostats, connected to an OmniPro II controller. The OmniPro II has since been replaced by an Elk M1. The thermostats have been slowly dying one by one (failing to turn the heating/cooling on and off correctly) and now that we are down...