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ComfortSense L7742U thermostat pdf manual download. Y2081) Description Outdoor Temperature Sensor ® The ComfortSense Model L7742U thermostat is an tion and Service Procedures manual, available as. Corp.1007-L2 on LennoxPROS.com or iComfort® thermostat are not available. Catalog # Y0349 or Y2081. tion and Service Procedures manual, available as Install Thermostat: Install room thermostat (ordered Catalog # Y0349 or Y2081. The Lennox icomfortt−enabled thermostat must be used in communicating applications. 7−SEGMENT. DISPLAY. PUSH. BUTTON. Set up of jumpers on replacement outdoor. See the icomfort Touch® thermostat Quick Start Guide for communicating and partial communicating field wiring connections. INSTALLATION. INSTRUCTIONS. I looked at a 7500 comfortsense manual and no where in that manual is a battery mentioned. Does a y2081 lennox thermostat have a batteryin it.Read this manual before programming the thermostat. Y2081). Description. The ComfortSense® Model L7742U thermostat is an electronic 7−day.