Honeywell T8131A, T8131B 669-08871

2Acquire tools and items (below) as needed. Also purchase two AA alkaline batteries; werecommend Energizer® batteries.

M878B

CROSS-RECESSED

SCREWDRIVER HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED TO

DRILL HOLES IN WALL

WIRE CUTTER/STRIPPER OR SHARP

KNIFE, IF NEEDED TO STRIP WIRES

MASKING TAPE, IF

NEEDED TO LABEL WIRES

AS DISCONNECTED FROM

OLD THERMOSTAT

LEVEL, IF NEEDED TO LEVEL

THERMOSTAT FOR APPEARANCE

Contents

Main Page Table of Contents RECYCLING not Prepare for Installation hot water GasMillivolt No Baseboard Electric (120/240 Line Volt) No Heat Pumps/Multistage Equipment No NOTE: Not compatible with any 120/240 volt circuit. 669-08871 Remove Old Thermostat also will not be connecting Replacing a Clock Thermostat that has C or C1 Clock Terminals? not separately, Do not wrap them together Six or More Wires? Install Batteries Page Program the Thermostat Page Page Program Schedule Page Page Page for current period only Page Adjust Fan Operation Switch out one turn F/ Adjust System On-Time, C FUEL SWITCH FE B W Y G Mount Thermostat Mounting Plate Page Wire Thermostat Terminals Page 26 69-08871 3-WIRE HEAT-ONLY 4-WIRE COOL-ONLY 5-WIRE HEAT/COOL Mount Thermostat Check Thermostat Operation After Programming and Installing Heating Cooling Page Set Fan and System Switches First set the fan switch. Then set the system switch. Troubleshooting Guide Page Page bAt Lo Page TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U.S. AND CANADA Page Limited One-Year Warranty