From inside (document excerpt):
Honeywell CT8602 Programmable Thermostat. Free PDF owner’s guide and user’s manual.
Seven Day Programmable Heat and/or Cool Low Voltage (20 to 30 Vac) Thermostat and Wallplate Model CT8602
Table of Contents
Step 1 Prepare for Installation 5
Step 2 Remove Old Thermostat 5
Step 3 Mount Thermostat Wallplate 6
Step 4 Wire Wallplate Terminals 7
Step 5 Install the Batteries 8
Step 6 Set Fan Operation Switch 9
Step 7 Mount the Thermostat 10
Step 8 Customize Your Thermostat 10
Step 9 Set the Clock 14
Step 10 Programming 14
Step 11 Operating Your Thermostat 17
Step 12 Set the Fan and System Switches 19
If You Have a Problem 20
Wiring Diagrams 22
Source: honeywell.com