Honeywell TH6110D/TH6220D Programmable Thermostat Operating Manual

About this manual

This operating manual introduces the Honeywell TH6110D/TH6220D programmable thermostat, highlighting its EnergyStar compliance, backlit display, and separate weekday/weekend scheduling. It explains safety warnings such as avoiding compressor damage when outdoor temperatures fall below 50°F (10°C).

The guide walks users through installing batteries, setting the time and day, selecting fan and system modes, programming schedules, and using one‑touch temperature overrides. It also includes quick reference cards, warranty information, and contact details for customer assistance.

What's inside

• About your new thermostat
• Features
• Programming & Operation
• Quick reference to controls
• Battery installation
• Warranty

Specifications

Frequently asked questions

How often should the batteries be replaced?

Batteries should be replaced once a year.

What outdoor temperature should I avoid operating the cooling system?

Do not operate the cooling system when the outdoor temperature is below 50°F (10°C).