For technicians servicing split systems or heat pumps

this is the official manufacturer-designated updated version for that part number

Common signs include yellow or flickering flames

73 Cv equal percentage flow characteristic

Rated at 20A 125VAC and 10A 250VAC with 3/4 HP capacity

Resideo TH1110U4000 Thermostat 321702-401 For technicians servicing split systemsThe Resideo TH1110U4000 FocusPRO Thermostat is a high performance non programmable digital thermostat designed for 1H 1C conventional systems and single stage heat pumps without auxiliary heat. Built on the UWP mounting system, this unit streamlines installation and serves as a direct cross reference for older models including the TH1100DH1004, TH3110U2008, and TH1110E1000. It operates on 24 VAC and supports a variety of fuel sources, including gas,