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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. ComfortSense L7742U thermostat pdf manual download. Y2081) Description Outdoor Temperature Sensor ® The ComfortSense Model L7742U thermostat is an See the icomfort Touch® thermostat Quick Start Guide for communicating and partial communicating field wiring connections. INSTALLATION. INSTRUCTIONS. The Lennox icomfortt−enabled thermostat must be used in communicating applications. 7−SEGMENT. DISPLAY. PUSH. BUTTON. Set up of jumpers on replacement outdoor. Install low voltage control wiring from outdoor to indoor unit and from thermostat to indoor unit. All low voltage wiring must enter unit through provided field tion and Service Procedures manual, available as Install Thermostat: Install room thermostat (ordered Catalog # Y0349 or Y2081.