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Honeywell Q674L Manual Online: internal schematic and typical wiring diagram Replaces Ge Ay28X078, Ay28X139; Trane Baystat 139, Baystat 239 And Baystat BAYSTAT239. 9^a. ^ . BAYSTAT240 d, m W. ^aN^^. mW na. ^^w pmnm^. Ea. BAY28X138 ^^^. ^a o m. ^F a^a. mRA .^"^^. BAY28X1 53 A. • 2 Heat/1 Cool. • Manual Updated Programmable Zone Sensor Installation manual due to internal Sensor changes and to clarify programming instructions. Overview of Manual. Note: One copyList of available manuals, guides and instructions for Trane BAYSTAT239 heat pump thermostat. Owner's Manual. Trane BAYSTAT239 Owner's Manual Language: English