Honeywell RTH5100B Non-programmable Thermostat Installation Instructions

About this manual

These installation instructions guide you through setting up the Honeywell RTH5100B non‑programmable thermostat. The guide includes a checklist of required items, safety precautions, and step‑by‑step procedures for mounting the wallplate, connecting wires, and configuring the thermostat.

The manual explains important wiring rules, special instructions for C and C1 wires, battery installation, and how to verify the installation. It also provides warranty information and contact details for Honeywell customer support.

What's inside

• Start Here
• Prepare for Installation
• Important Instructions
• Remove Old Thermostat
• Special Wiring Instructions
• Install Batteries
• Configure Installer Setup
• Customer Assistance
• Limited One-Year Warranty

Specifications

Frequently asked questions

What type of batteries does the RTH5100B require?

The thermostat uses two AAA alkaline batteries.

What should be done before removing the old thermostat?

Turn off power at the heating and/or cooling system or at the circuit breaker panel.

Can the new thermostat be wired based on wire color?

No, you must not wire the new thermostat based on wire color.

How should a thermostat containing mercury be disposed of?

Do not place it in the trash; contact local waste management for proper recycling.