Honeywell RTH221B1047 User Manual

Owner’s Manual
RTH221B1047
RTH2300B1020
Read before installing
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RTH2300/RTH221
Series
Programmable
Thermostat
Identify System Type
This thermostat is compatible with the following systems:
• Gas, oil or electric furnace
• Central air conditioner
• Hot water system with or without pump
• Millivolt system
• Central heating and cooling system
• Heat pump without auxiliary/backup heat
Do you need assistance? We are here to help.
Call 18004681502 for wiring assistance before returning
the thermostat to the store.
This thermostat cannot be used on heat pumps with
backup heat or on multistage systems.
Input: 2 x AAA batteries (1.5V each)

Honeywell RTH221B1047 Specifications

General

Brand	Honeywell
Model	RTH221B1047
Category	Thermostat
Language	English

Summary

Installation and System Setup

Initial Installation Procedures

Covers turning off power, removing the old thermostat, labeling wires, and preparing the wallplate.

Mounting and Wiring Connections

Guidance on mounting the wallplate and connecting the thermostat wires to the correct terminals.

Finalizing Installation and Power Up

Steps for setting fan switch, installing the thermostat, and restoring power to the system.

Advanced System Configuration

Instructions for entering system setup and configuring settings for specific system types.

Thermostat Operation and Programming

Understanding Thermostat Controls and Display

Details the function of physical buttons and the thermostat's screen elements.

Setting Time and Program Schedules

Guides on setting the clock, day, and programming daily time periods and temperatures.

Schedule Overrides and Compressor Protection

Explains temporary/permanent overrides and the built-in compressor protection feature.

Battery Replacement Procedure

Instructions on when and how to replace the thermostat's batteries.

Troubleshooting and Warranty Information

Resolving Common Thermostat Issues

Provides solutions for common problems like a blank display or system non-response.

Product Limited Warranty Details

Outlines the terms and conditions of the one-year limited warranty for the product.