About This Thermostat
The Honeywell RTH8500D is designed to electronically control your home's heating and cooling systems. This owner's guide provides comprehensive instructions for installation, setup, and daily operation to help you optimize comfort and energy savings.
For assistance, visit www.honeywell.com/yourhome or contact Honeywell Customer Care toll-free at 1-800-468-1502.
Key Features & Installation Overview
This document covers essential steps for a successful installation, including:
- Preparing for installation and checking included components.
- Following important wiring instructions to avoid system damage.
- Safely removing your old thermostat.
- Properly labeling and connecting wires to the new thermostat.
- Mounting the new wallplate and attaching the thermostat.
- Setting the calendar, installer setup, and system preferences.
- Understanding the thermostat display and programming your schedule.
Please read and save these instructions for future reference.
Important Considerations
- Always turn off power to your heating and cooling system before beginning installation.
- Do not connect wires based on color; use the provided wire labels for accurate connections.
- If replacing a thermostat containing mercury, follow local disposal guidelines.
