Honeywell RTH7400/RTH7500 RET97D Series Programmable Thermostat Owner’s Manual

Table of Contents

RTH7400/RTH7500 RET97D SeriesOwner’s Manual

This is a legacy product document supported by Resideo. It is no longer manufacturedProgrammable Thermostat

Read and save these instructions.For help please visit yourhome.honeywell.com

Installation is Easy

Label wires and remove your old thermostat
Install and wire your new thermostat
Set your new thermostat to match your heating/cooling system

This thermostat works with virtually all System Types
It is preset for the most common systemDo you need assistance? We are here to help.Call 1-800-468-1502 for wiring assistance before returning the thermostat to the store.

NO MERCURY NE PAS JETER LE MERCURE

ATTENTION: MERCURY RECYCLING NOTICEThis product does not contain mercury. However, this product may replace a product that contains mercury. Mercury and products containing mercury should not be discarded in household trash. For more information on how and where to properly recycle a thermostat containing mercury in the United States, please refer to the Thermostat Recycling Corporation at www.thermostat-recycle.org. For mercury thermostat recycling in Canada, please refer to Switch the Stat at www.switchthestat.ca

This thermostat contains a Lithium battery which may contain Perchlorate material. Perchlorate Material–special handling may apply, See www.dtsc.ca.gov/hazardouswaste/perchlorate NOTICE: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50°F (10°C).

Customer assistance

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 note your model number and date code before calling.Pull at bottom to remove thermostat from wallplate. Turn thermostat over to find model number and date code.® U.S. Registered Trademark. Patents pending.US Patent No. 6,595,430; 7,114,554; 7,274,972; 7,225,054 and other patents pending

Turn Off Power to Heating/Cooling System
Remove Old ThermostatRemove old thermostat but leave wallplate with wires attached.If you have an older thermostat with a sealed mercury tube, turn to page 2 for proper disposal instructions.
Label Wires with TagsLabel the wires using the supplied wire labels as you disconnect them.
Separate Wallplate from New ThermostatRemove wallplate from the new thermostat and mount onto wall.
Mount WallplateMount the new wallplate using the included screws and anchors.Drill 3/16-in. holes for drywallDrill 3/32-in. holes for plaster
Connect WiresSimply match wire labels.If labels do not match letters on the thermostat, check “Alternate Wiring (Conventional Systems)” on page 6 and connect to terminal as shown here (see notes, below).We are here to help. Call 1-800-468-1502 for wiring assistance.Alternate Wiring (Conventional Systems)If labels do not match terminals, connect wires as shown here (see notes, below).1. Remove metal jumper connecting R and Rc only if you must connect both R and Rc wires.2. If your old thermostat had both R and RH wires, remove metal jumper. Connect the R wire to the Rc terminal, and the RH wire to the R terminal.3. If your old thermostat had only 1 C or C1 wire, connect it to the C terminal. If your old thermostat had 2 C or C1 wires, wrap each separately with electrical tape and do not connect them.Alternate Wiring (Heat Pump)If labels do not match letters on thermostat, see page 7.NOTE: If E and Aux do not each have a wire connected, use a small piece of wire to connect them to each other.Alternate Wiring (For Heat Pumps Only)1. Leave metal jumper in place, connecting R & Rc terminals.2. If your old thermostat had both V and VR wires, stop now and contact a qualified contractor for help.3. If your old thermostat had separate O and B wires, attach the B wire to the C terminal.4. If another wire is attached to the C terminal, stop now and contact a qualified contractor for help.5. If your old thermostat had Y1, W1 and W2 wires, stop now and contact a qualified contractor for help.6. If L terminal is used, C terminal wire must be connected (contact a 5 contractor if there is no C wire).6. If E and Aux terminals do not each have a wire connected, use a small 6 piece of wire to connect them to each other.
Install BatteriesInstall two AA alkaline batteries and remove tab.
Install Thermostat onto WallplateInstall thermostat onto the wallplate on the wall.
Turn Power Back OnTurn the power back on to the heating/cooling system.
Set Time and Date1. Press to set month, then press NEXT.2. Press to set day, then press NEXT.3. Press to set year, then press DONE.4. Press to set time, then press DONE to save and exit.
If your system type is…If your system type is: Single Stage Heat and CoolCongratulations, you’re done!If your system type is: Multistage Heat and Cool Heat Pump* without Backup Heat Heat Pump* with Backup Heat Heat Only Cool OnlyContinue with Advanced Installation on next page to match your thermostat to your system type.*Heat Pump–an air conditioner that provides cooling in the summer, and also runs in reverse in the winter to provide heating.If you are not sure of your system type or if you have other questions, call us toll-free at 1-800-468-1502.This thermostat works on 24 volt or 750 mV systems. It will NOT work on 120/240 volt systems.

Advanced Installation

Enter System Setup

Press and release the left button.
Press and hold the center button until the screen changes (approximately 5 seconds).

Changing Settings

Press the s or t button to change the setting.
Press NEXT to advance to next function.

Press DONE to save & exit.

NOTE: Some functions in the following pages may not appear due to previous selections made.

Function	Description	SettingPress the button to change the setting.
0120	Year Setting (first two digits)	20 = Year 20 xx21 = Year 21 xx
0130	Year Setting (second two digits)	01 – 99 (i.e., 2001 – 2099
0140	Month Setting	01 – 12 (i.e., January – December)
0150	Date Setting	01 – 31

Function	Descriptions	SettingPress the button to change the setting.
0170	Select System Type	1 Heat/cool: Gas, oil or electric heating with central air conditioning.2 Heat pump: Heat pump without backup or auxiliary heat.3 Heat only: Gas, oil or electric heat without central air conditioning.4 Heat only with fan: Gas, oil or electric heat without central air conditioning.5 Hot water heat only (no fan): Gas, oil or hot water heat without central air conditioning.6 Cool only: Central air conditioning only.7 Heat pump: Heat pump with backup or auxiliary heating.8 Heat/Cool Multiple stages: 2 heat stages (wires on W and W2), 2 cooling stages (wires on Y and Y2).9 Heat/Cool Multiple stages: 2 heat stages (wires on W and W2), 1 cooling stage (wire on Y).10Heat/Cool Multiple stages: 1 heat stage (wire on W), 2 cooling stages (wires on Y and Y2).
0180	Heating Fan Control	0 Gas or oil heat: Use this setting if you have a gas or oil heating system (system controls fan operation).1 Electric heat: Use this setting if you have an electric heating system (thermostat controls fan operation).
0190	Heat Pump Changeover Valve (for heat pumps only)	0 Cooling changeover valve: Use this setting if you connected a wire labeled “0” to the 0/B terminal (see page 6).1 Heating changeover valve: Use this setting if you connected a wire labeled “B” to the 0/B terminal (see page 7).
0240	Heating Cycle Rate	5 Gas or oil furnace: Standard gas/oil furnace (less than 90% efficiency).9 Electric furnace: Electric heating systems.3 Heat pump, hot water or high-efficiency furnace: Hot watersystem or gas furnace (more than 90% efficiency).1 Gas/oil steam or gravity system: Steam or gravity heat systems.
0270	Emergency Heat Cycle Rate (heat pumps only)	9 Electric furnace: Electric heating systems.
0300	Manual/Auto Changeover	0 Manual changeover (Heat/CooV0f1).1 Automatic changeover (Heat/CooVAuto/Off). Automatically turns on Heat or Cool based on room temperature. Note: System maintains minimum 3°F difference between heat and cool settings.
0320	Temperature Format (°F/°C)	0 Fahrenheit 1 Celsius
0330	Daylight Saving Time On/Off	0 Off: No adjustment for daylight saving time.1 On: Auto-change to daylight saving time (for areas that do not use the new 2007 DST calendar).2 On: Auto-change to daylight saving time (2007 and beyond, for areas that use the new 2007 DST calendar).
0500	Furnace Filter Change Reminder	0 Off (no reminder)1 Reminder in about 1 month2 Reminder in about 3 months3 Reminder in about 6 months4 Reminder in about 9 months5 Reminder in about 1 year6 Reminder in about 3 years
0530	Smart Response® Technology	1 On 0 Off
0600	Maximum Heat Setting	90°F (other options: 40-89°F [4-32°C])
0610	Minimum Cool Setting	50°F (other options: 51-99°F [11-37°C])
0640	Clock Format	1212-hour clock (i.e., “3:30 pm”) 2424-hour clock (i.e., “15:30”)

About your new thermostat

Your new Honeywell thermostat has been designed to give you many years of reliable service and easy-to-use, push-button climate control.

Easy-to-follow menu programming.
One-touch temp control overrides program schedule at any time.
Precise comfort control keeps temperature within 1°F of the level you set.
Change/check reminder lets you know when to replace furnace filter.
Large display with backlight is easy to read–even in the dark

Thermostat controls

Display screen

…SYSTEM to select:Heat: Heating system control.Cool: Cooling system control.Auto: Thermostat automatically selects heating or cooling depending on the indoor temperature.Off: All systems off. EmHeat: Emergency & Auxiliary Heat control. Compressor is locked out. (Select models only.)…FAN to select:Auto: Fan runs only when heating or cooling system is on.On: Fan runs continuously.Press DONE to exit and save settings.

Clock setting

To set the current time display, press CLOCK & MORE, then press or to adjust the time. Press and hold or to advance the time more quickly.
Press DONE to save & exit (or press GO BACK to exit without changing the time).NOTE: The real-time clock should never require adjustment since it automatically updates for daylight savings time, and stores all date/time information.

Program Schedule

You can program four time periods each day, with different settings for weekdays and weekends. We recommend the pre-set settings (shown in the table below), since they can reduce your heating/cooling expenses.

Wake – Set to the time you awaken and the temperature you want during the morning, until you leave for the day.Leave – Set to the time you leave home and the temperature you want while you are away (usually an energy-saving level).Return – Set to the time you return home and the temperature you want during the evening, until bedtime.Sleep – Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).NOTE: Leave and Return periods can be canceled on weekends.

To adjust program schedules (RTH7400 only)

Press SCHEDULE, then EDIT to see weekdays.
Press SELECT DAY to highlight Mon-Fri (they will share the same settings).
Press NEXT STEP twice, then press to set Wake time for selected days.
Press NEXT STEP, then to set Heat temperature for this time period.
Press NEXT STEP, then to set Cool temperature for this time period.
Repeat steps 3-5 to program other time periods (LEAVE, RETURN, SLEEP), then press DONE.
Repeat steps 1-6 to program Saturday/ Sunday. (Press until the desired day is flashing, then press SELECT DAY.)
Press DONE to save & exit.

To adjust program schedules (RTH7500/RET97D only)

Press SCHEDULE, then EDIT to see weekdays.
Press SELECT DAY. You can select multiple days to program with the same settings.
Press NEXT STEP twice, then press to set Wake time for selected day(s).
Press NEXT STEP, then to set Heat temperature for this time period.
Press NEXT STEP, then to set Cool temperature for this time period.
Repeat steps 3-5 to program other time periods (LEAVE, RETURN, SLEEP), then press DONE.
Repeat steps 1-6 to program any remaining days. (Press until the desired day is flashing, then press SELECT DAY.)
Press DONE to save & exit.

Program schedule override (temporary)

Press to immediately adjust the temperature. This will temporarily override the temperature setting for the current time period. The new temperature will be maintained until the next time period. When the timer expires, the program schedule will resume and set the temperature to the level you’ve programmed for the current time period. To cancel the temporary setting at any time, press USE SCHEDULE.

Program schedule override (permanent)

Press to adjust temperature, then press HOLD. This will turn off the program schedule. Whatever temperature you set will be maintained 24 hours a day, until you manually change it, or press USE SCHEDULE to cancel “Hold” and resume the program schedule.

Auto changeover

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-degrees 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-degree separation. The display will also show both “Auto” and either “Heat” or “Cool” for which temperature setting you are currently adjusting. Press the system button to select between the heat and cool to view/adjust either mode. CAUTION: To avoid possible compressor damage, do not use Auto Changeover if the outside temperature drops below 50°F (10°C).

Filter reminder

If activated during installation, the furnace filter reminder alerts you when it is time to replace your filter. Press RESET after changing the filter, to restart the timer. To reset the reminder interval before it expires:

Press MORE, then NEXT.
Press RESET.
Press DONE to save and exit.

Special features

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 “Recovery” is displayed when the system is activated before a scheduled time period.

Compressor Protection: This feature forces the compressor to wait a few minutes before restarting, to prevent equipment damage. During the wait time, the message “Wait” is displayed on screen.

Auto Changeover: This feature is used in climates where both air conditioning and heating are used on the same day. When the system is set to Auto, the thermostat automatically selects heating or cooling depending on the indoor temperature. Heat and cool settings must be at least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree separation.

Battery replacement

Batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. Install fresh batteries immediately when the LO BATT warning begins flashing. The warning flashes about 30 days before 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.Grasp thermostat and pull to remove from wallplate

Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.

Display is blank	• Check circuit breaker and reset if necessary.• Make sure power switch at heating & cooling system is on.• Make sure furnace door is closed securely.• Make sure fresh AA alkaline batteries are correctly installed.
Temperature settings do not change	Make sure heating and cooling temperatures are set to acceptable ranges:• Heat: 40° to 90 °F (4.5° to 32 °C).• Cool: 50° to 99 °F (10° to 37 °C).
Heating or cooling system does not respond	• Press SYSTEM to set system to Heat. Make sure the temperature is set higher than the Inside temperature.• Press SYSTEM to set system to Cool. Make sure the temperature is set lower than the Inside temperature.• Check circuit breaker and reset if necessary.• Make sure power switch at heating & cooling system is on.• Make sure furnace door is closed securely.• Wait 5 minutes for the system to respond.
Cannot change system setting to Cool	• Check Function 0170: System Type to make sure it is set to match your heating and cooling equipment.
Fan does not turn on when heat is required	• Check Function 0180: Heating Fan Control to make sure it is set to match your heating equipment.
Heating system is running in cool mode	• Check Function 0170: System Type to make sure it is set to match your heating and cooling equipment.
Red light is on	• If thermostat is in Emergency Heat mode the red light is normal.It shows that the thermostat is in emergency heat mode.• If thermostat is not in Emergency Heat mode, contact a qualified service contractor for repair.
“Wait” appears on the screen	• Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor.
Heat pump issues cool air in heat mode, or warm air in cool mode	• Check Function 0190: Heat Pump Changeover Valve to make sure it is properly configured for your system.

For assistance with this product, please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.

1-year limited warranty

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,(i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or(ii) call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you.

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.

Automation and Control SolutionsHoneywell International Inc.1985 Douglas Drive NorthGolden Valley, MN 55422yourhome.honeywell.com

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Posted

2023-01-22

Honeywell

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Honeywell, PROGRAMMABLE THERMOSTAT, RET97D, RTH7400, RTH7500