Honeywell RTH8500D User Manual

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Contents
Prepare for Installation................................................................... 3
Follow Important Instructions......................................................... 5
Remove Old Thermostat................................................................ 6
Follow Special Instructions ............................................................ 7
Label Old Thermostat Wires .......................................................... 10
Mount New Wallplate to Wall ......................................................... 11
Connect Wires to New Wallplate ................................................... 15
Install Batteries .............................................................................. 22
Attach New Thermostat to Wallplate.............................................. 23
Set the Calendar............................................................................ 24
Configure Installer Setup ............................................................... 26
Get to Know Your Thermostat Display........................................... 38
Set System Setting ........................................................................ 40
Program Your Heating and Cooling Schedule ............................... 42
Cancel a Schedule Period ............................................................. 46
Set Time ........................................................................................ 47
Set Temperature Overrides............................................................ 48
Clean Your Thermostat Screen ..................................................... 51
Use Your Filter Timer ..................................................................... 52
Understanding Temperature Recovery Feature............................. 53
Replace Batteries .......................................................................... 54
Review Battery Tips....................................................................... 57
Built-in Compressor Protection...................................................... 58
Troubleshooting Tips ..................................................................... 59
Customer Assistance..................................................................... 62
Limited One-Year Warranty ........................................................... 63

Honeywell RTH8500D Specifications

General

Programmability	7-day programmable
Wi-Fi	No
Operating Modes	Heat, Cool, Auto, Off
Filter Change Alert	Yes
Backup Battery	Yes
Display	Touchscreen
Power Source	Battery or Hardwired
Compatibility	Gas, oil, electric, and heat pump systems
Stages	Up to 2 Heat/2 Cool
Fan Modes	Auto, On, Circulate
Temperature Range	40°F to 99°F (4°C to 37°C)
Hold Feature	Yes