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From inside (document excerpt):
Owner’s Manual PROGRAMMABLE DIGITAL THERMOSTAT 53DFS250-SL Table of Contents DISPLAY QUICK START Set the clock and go BASIC OPERATION PROGRAMMING Occupied and Unoccupied Periods ADVANCED SETUP ABOUT ADVANCED FEATURES AND OPERATION WARRANTY ยท 7-Day Programmable 3 Occupied Modes, 1 Unoccupied Mode Auto Changeover Large, Easy To Read Display ThermoglowTM Backlight Remote Sensor Ready Dry Contact Equipped Energy Saving Smart Fan Fan Purge, IAQ Feature Meets California Title 24 2 2 3 3 4 5 7 IMPORTANT: Follow Installation Instructions before proceeding.
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M : ProgramOn Pm occupied 1 COOL Override CAUTION: SET THERMOSTAT TO MODE “OFF ” PRIOR TO CHANGING SETTINGS IN SETUP OR RESTORING FACTORY DEFAULTS. ! HEAT Mode Fan Holiday Program Set Clock Override MODE FAN HOLIDAY PROGRAM SET CLOCK Backlit LCD Display M : ProgramOn Pm occupied 1 Warmer or + Button COOL Override HEAT Cooler or – Button Override Button Heat or Cool Indicator Red = Heat, Green = Cool Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 535-329 Printed in U.S.A. Form OM53-4 Pg 1 11-04 Replaces: New Book 1 4 Tab 3e 2f Display 6 1 10 7 Quick Start Set the Clock and Go During Setup and Programming: Pressing the Mode button selects different flashing items (represented in black). Pressing the Up and Down buttons will modify the flashing selection 2 Am ProgramOn Setup Pm Stop Start SuMTuWThFSa unoccupied 123 Locked AUTO COOL Override HEAT Fan 3 : M Pm 1 Mode Indicators Selects the operation mode of the equipment. COOL — indicates the air conditioning mode. HEAT — indicates the heat mode. AUTO — indicates the system will automatically changeover between the heat and cool modes as the temperature varies. OFF — indicates the entire system is turned off. PROGRAM ON — indicates the stored program is enabled to run. See page 3. 2 Clock with Day of the Week Indicates the current time and day. This clock is also used to program the timer periods. See this page. 3 Room Temperature Display Indicates the current room temperature. 4 Desired Set Temperature Indicates desired room temperature(s). See page 3.