What type of heating and cooling systems is the PRO TH4210D compatible with?
The PRO TH4210D is designed to control 24 VAC heat pump systems with auxiliary heat, specifically 2 heat/1 cool configurations. It supports Heat, Off, Cool, and Em Heat system settings, as well as Auto and On fan settings. (Page 2)
From the official Honeywell Pro Th4210D manual, page 2
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