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3-wire zoned hydronic heating systems. 1F89-211. Non-programmable Electronic Digital. Heat Pump Thermostat. INSTALLATION AND. OPERATION INSTRUCTIONS. If the ther- mostat you are replacing or the heat pump being installed with this thermostat requires a “B” terminal, to energize the changeover relay in HEAT, plus wiring diagrams, troubleshooting tips and more, visit us at icmcontrols.com SimpleComfort® Thermostats White-Rodgers: 1F79-111, 1F89-211.43 New I3-Series Touch Thermostats Overview and General Features. White-Rodgers: 1F86-0471 SC4010 White-Rodgers: 1F79-111, 1F89-211 SC2201L, SC2201VL,