This manual covers the RTH6350 and RTH6450 models.
Quick Reference Card
Grasp and pull to see basic operating instructions at a glance.
Battery Holder
Press down and pull to remove the batteries. Batteries should be replaced once a year (see page 15).
NOTE: Remove battery holder; the model number is on the battery holder.
Need Help?
For assistance with this product please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502
Read and save these instructions.
® U.S. Registered Trademark.
US Patent No. D542,677 and other patents pending
Copyright © 2011 Honeywell International Inc. All rights reserved.
This thermostat is ready to go!
Your new thermostat is pre-programmed and ready to go. See page 3 to check settings.
Congratulations on the purchase of your new Honeywell thermostat. It has been designed to give you many years of reliable service and easy-to-use, push-button climate control.
This thermostat is ready to go!
Your new thermostat is pre-programmed and ready to go. All you have to do is set the time and day. Then check the settings below and change if needed:
Quick reference to display screen
Set the time and day
Select the fan setting
Press the FAN button to select Auto or On.
In “Auto” mode (the most commonly used setting), the fan runs only when the heat-ing or cooling system is on. If set to “On,” the fan runs continuously.
Select the system setting
Note: The Auto setting may not appear, depending on how your thermostat was installed.
Press the SYSTEM button to select Heat, Cool or Off.
Save money by setting program schedules
It’s easy to program your system for maximum energy savings. You can program four time periods each day, with different settings for weekdays, Saturday and Sunday.
Energy-saving settings for maximum cost savings
This thermostat is pre-set with energy-saving program settings. We recommend these settings, since they can reduce your heating/cooling expenses by as much as 33%. (See next page to adjust times and temperatures of each time period.)
To adjust program schedules (RTH6350 only)
To adjust program schedule (RTH6450 only)
Program Schedule override (temporary)
Press to cancel temporary setting and resume program schedule.
Note: Make sure the thermostat is set to the system you want to control (heat or cool).
Program Schedule override (permanent)
Press to cancel “Hold” setting and resume program schedule.
Note: Make sure the thermostat is set to the system you want to control (heat or cool).
Use this feature in climates where both air conditioning and heating are used on the same day. When the system mode is in Auto, the thermostat automatically selects heating or cooling depending on the indoor temperature.
While in the Auto mode, if a schedule override takes place (temporarily or permanently) the thermostat will automatically adjust the cooling and heating settings to maintain a 3-degree separation between the cool and heat settings.
For example, if the heat temperature is raised to where it gets within 3-dgrees of the cool setting, the display will show an up arrow next to “cool” to show the thermostat is raising the cool setting up to maintain a 3-dgreee separation.
Press the Select Heat/Cool button to select between the heat and cool to view/adjust either mode.
If the cool temperature is lowered to where it gets close to the heat setting, an arrow next to heat will show the thermostat is lowering the heat setting down to maintain a 3-degree separation.
CAUTION: To avoid possible compressor damage, do not use Auto Changeover if the outside temperature drops below 50ºF (10ºC).
This feature helps prevent damage to the compressor in your air conditioning or heat pump system.
Damage can occur if the compressor is re-started too soon after shutdown. This feature forces the compressor to wait a few minutes before restarting.
During the wait time, the display will flash the message Cool On (or Heat On if you have a heat pump). When the safe wait time has elapsed, the message stops flashing and the compressor turns on.
Smart Response® Technology: This feature allows the thermostat to “learn” how long the furnace and air conditioner take to reach programmed temperature settings, so the temperature is reached at the time you set. For example: Set the Wake time to 6 am, and the temperature to 70°. The heat will come on before 6 am, so the temperature is 70° by the time you wake at 6. The message “In Recovery” is displayed when the system is activated before a scheduled time period.
Press down and pull to remove.
Install fresh batteries immediately when the REPLACE BATTERY warning begins flashing. The warning flashes about two months before the batteries are depleted.
Even if the warning does not appear, you should replace batteries once a year, or before leaving home for more than a month.
If batteries are inserted within two minutes, the time and day will not have to be reset. All other settings are permanently stored in memory and do not require battery power.
For assistance with this product, please visit http://yourhome.honeywell.com. Or call Honeywell Customer Care toll-free at 1-800-468-1502.
To save time, please remove the battery holder and note your model number and date code before calling.
To order, please call Honeywell Customer Care toll-free at 1-800-468-1502.
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If at any time during the warranty period the product is determined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option).
If the product is defective,
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.
Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE-YEAR DURATION OF THIS WARRANTY.
Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
If you have any questions concerning this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502. In Canada, write Retail Products ON15-02H, Honeywell Limited/ Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V4Z9.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
® U.S. Registered Trademark.
© 2011 Honeywell International Inc.
69-2415ES—03 M.S. Rev. 03-11
Printed in U.S.A.
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