Owner's Manual
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Registered Trademark © 2004 Honeywell International Inc. Operating Instructions RTH5100B Non-programmable Thermostat OPERATING INSTRUCTIONS The RTH5100B Thermostat provides electronic control of 24 Vac single stage heating and cooling systems or 750 mV heating systems. For assistance with your Honeywell product please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll free at 1-800-468-1502. All Rights Reserved • Patents Pending 69-1722 Read and Save these Instructions ® U.S.
Registered Trademark © 2004 Honeywell International Inc. Operating Instructions RTH5100B Non-programmable Thermostat OPERATING INSTRUCTIONS The RTH5100B Thermostat provides electronic control of 24 Vac single stage heating and cooling systems or 750 mV heating systems. For assistance with your Honeywell product please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll free at 1-800-468-1502. All Rights Reserved • Patents Pending 69-1722 Read and Save these Instructions ® U.S.
Owner's Manual
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Contents Features 3 Get to Know Your Thermostat 4 Thermostat 4 Display 5 Operate Your Thermostat 6 Set System Setting 6 Set Fan Setting 7 Change Temperature Setting 8 Replace Batteries 9 Review Battery Tips 13 Built-in Compressor Protection 14 Accessory/Replacement Parts 15 Troubleshooting Tips 16 Customer Assistance 21 Limited One-Year Warranty 22 69-1722 2
Contents Features 3 Get to Know Your Thermostat 4 Thermostat 4 Display 5 Operate Your Thermostat 6 Set System Setting 6 Set Fan Setting 7 Change Temperature Setting 8 Replace Batteries 9 Review Battery Tips 13 Built-in Compressor Protection 14 Accessory/Replacement Parts 15 Troubleshooting Tips 16 Customer Assistance 21 Limited One-Year Warranty 22 69-1722 2
Owner's Manual
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Features • Large, Clear, Backlit Display: Easy-to-see and read-even in Compressor Protection: Minimum-off timer protects compressor from restarting too early after a shutdown. Simultaneously displays both room temperature and temperature setting. • Easy Change Battery Holder. • Built-in the dark. • Precise Comfort Control: ±1ºF of your set temperature. • Simplified Operation: Soft-key controls. Get To Know Your Thermostat 3 69-1722
Features • Large, Clear, Backlit Display: Easy-to-see and read-even in Compressor Protection: Minimum-off timer protects compressor from restarting too early after a shutdown. Simultaneously displays both room temperature and temperature setting. • Easy Change Battery Holder. • Built-in the dark. • Precise Comfort Control: ±1ºF of your set temperature. • Simplified Operation: Soft-key controls. Get To Know Your Thermostat 3 69-1722
Owner's Manual
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Inside SetCtinogol Fan Auto SysteCmoolOn Cool PRESS BATTERY HOLDER TWO AAA ALKALINE BATTERIES TEMPERATURE SETTING BUTTON RAISES TEMPERATURE SETTING FAN BUTTON SELECTS AUTO OR ON TEMPERATURE SETTING BUTTON LOWERS TEMPERATURE SETTING SYSTEM BUTTON SELECTS HEAT, OFF OR COOL M22010 69-1722 4 Get To Know Your Thermostat Thermostat DIGITAL DISPLAY BATTERY HOLDER LATCH PRESS TO RELEASE BATTERY HOLDER.
Inside SetCtinogol Fan Auto SysteCmoolOn Cool PRESS BATTERY HOLDER TWO AAA ALKALINE BATTERIES TEMPERATURE SETTING BUTTON RAISES TEMPERATURE SETTING FAN BUTTON SELECTS AUTO OR ON TEMPERATURE SETTING BUTTON LOWERS TEMPERATURE SETTING SYSTEM BUTTON SELECTS HEAT, OFF OR COOL M22010 69-1722 4 Get To Know Your Thermostat Thermostat DIGITAL DISPLAY BATTERY HOLDER LATCH PRESS TO RELEASE BATTERY HOLDER.
Owner's Manual
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Get to Know Your Thermostat (Cont) Display INSIDE TEMPERATURE INDICATES BATTERIES ARE LOW AND MUST BE REPLACED Inside Replace Batt HeatCool Setting TEMPERATURE SETTING Fan On Auto Heat On Cool On System Heat Cool Off INDICATES THERMOSTAT IS "CALLING" FOR HEAT OR COOL CURRENT FAN SETTING CURRENT SYSTEM SETTING M22011 5 69-1722
Get to Know Your Thermostat (Cont) Display INSIDE TEMPERATURE INDICATES BATTERIES ARE LOW AND MUST BE REPLACED Inside Replace Batt HeatCool Setting TEMPERATURE SETTING Fan On Auto Heat On Cool On System Heat Cool Off INDICATES THERMOSTAT IS "CALLING" FOR HEAT OR COOL CURRENT FAN SETTING CURRENT SYSTEM SETTING M22011 5 69-1722
Owner's Manual
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Cool-Thermostat controls the cooling system. Do not operate cooling system when outdoor temperature is below 50 °F (10 °C). Off-Both the heating and cooling systems are off. Operate Your Thermostat Set System Setting Press the System button to select Heat, Off or Cool: Heat-Thermostat controls the heating system. Service Needed Fan Auto Cool On Cool PRESS THE SYSTEM BUTTON TO SELECT HEAT, OFF OR COOL M22012 69-1722 6 CAUTION Equipment Damage Hazard. Air conditioning compressor damage possible.
Cool-Thermostat controls the cooling system. Do not operate cooling system when outdoor temperature is below 50 °F (10 °C). Off-Both the heating and cooling systems are off. Operate Your Thermostat Set System Setting Press the System button to select Heat, Off or Cool: Heat-Thermostat controls the heating system. Service Needed Fan Auto Cool On Cool PRESS THE SYSTEM BUTTON TO SELECT HEAT, OFF OR COOL M22012 69-1722 6 CAUTION Equipment Damage Hazard. Air conditioning compressor damage possible.
Owner's Manual
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Use this setting for improved air circulation or for most homes.The fan runs only when the heating or cooling system is on. On-The fan runs continuously. Operate Your Thermostat (Cont) Set Fan Setting Press the Fan button to select Auto or On: Auto-Normal setting for more efficient air cleaning. Service Needed Fan Auto Cool On Cool PRESS THE FAN BUTTON TO SELECT AUTO OR ON 7 M22013 69-1722
Use this setting for improved air circulation or for most homes.The fan runs only when the heating or cooling system is on. On-The fan runs continuously. Operate Your Thermostat (Cont) Set Fan Setting Press the Fan button to select Auto or On: Auto-Normal setting for more efficient air cleaning. Service Needed Fan Auto Cool On Cool PRESS THE FAN BUTTON TO SELECT AUTO OR ON 7 M22013 69-1722
Owner's Manual
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... or Down button turns on the backlight. Replace Batt Service Needed Fan System Auto Cool TEMPERATURE SETTING RANGE: HEAT: 40°TO 90°F (4.5°T0 32°C) COOL: 50°TO 99°F (10° T0 37°C) TEMPERATURE SETTING PRESS THIS BUTTON TO RAISE THE TEMPERATURE SETTING PRESS THIS BUTTON TO LOWER THE TEMPERATURE SETTING M22014 The first press of the Up or Down button changes the temperature setting. 69-1722 8 Operate Your Thermostat (Cont) Change Temperature Setting Press...
... or Down button turns on the backlight. Replace Batt Service Needed Fan System Auto Cool TEMPERATURE SETTING RANGE: HEAT: 40°TO 90°F (4.5°T0 32°C) COOL: 50°TO 99°F (10° T0 37°C) TEMPERATURE SETTING PRESS THIS BUTTON TO RAISE THE TEMPERATURE SETTING PRESS THIS BUTTON TO LOWER THE TEMPERATURE SETTING M22014 The first press of the Up or Down button changes the temperature setting. 69-1722 8 Operate Your Thermostat (Cont) Change Temperature Setting Press...
Owner's Manual
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all settings are replaced; REPLACE BATTERY INDICATOR Replace Batt Service Needed Fan System Auto Cool M22015 The thermostat does not lose any settings when the batteries are permanently stored in memory. 9 69-1722 When the Replace Battery indicator is flashing, replace batteries promptly with two fresh AAA alkaline batteries. Replace Batteries 1.
all settings are replaced; REPLACE BATTERY INDICATOR Replace Batt Service Needed Fan System Auto Cool M22015 The thermostat does not lose any settings when the batteries are permanently stored in memory. 9 69-1722 When the Replace Battery indicator is flashing, replace batteries promptly with two fresh AAA alkaline batteries. Replace Batteries 1.
Owner's Manual
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BATTERY HOLDER LATCH BATTERY HOLDER Service Needed Fan Auto Cool M22016 69-1722 10 Replace Batteries (Cont) 2. Remove the battery holder from the thermostat. Press the battery holder latch to release the battery holder. 3.
BATTERY HOLDER LATCH BATTERY HOLDER Service Needed Fan Auto Cool M22016 69-1722 10 Replace Batteries (Cont) 2. Remove the battery holder from the thermostat. Press the battery holder latch to release the battery holder. 3.
Owner's Manual
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Replace Batteries (Cont) 5. BATTERY HOLDER LATCH BATTERY HOLDER Service Needed Fan Auto Cool M22016 69-1722 12 Insert battery holder as shown.
Replace Batteries (Cont) 5. BATTERY HOLDER LATCH BATTERY HOLDER Service Needed Fan Auto Cool M22016 69-1722 12 Insert battery holder as shown.
Owner's Manual
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... a month to lack of battery power. Replace the batteries as soon as long and can damage the thermostat. 4. NOTE: Replacing the batteries once a year also helps prevent battery leakage that can leak, causing thermostat damage. 3. As a precaution, replace the batteries when leaving your heating/cooling system from shutting down if the batteries run down completely. 13 69-1722 Always use fresh AAA alkaline batteries. The Replace Battery indicator flashes in the display. Review Battery Tips 1.
... a month to lack of battery power. Replace the batteries as soon as long and can damage the thermostat. 4. NOTE: Replacing the batteries once a year also helps prevent battery leakage that can leak, causing thermostat damage. 3. As a precaution, replace the batteries when leaving your heating/cooling system from shutting down if the batteries run down completely. 13 69-1722 Always use fresh AAA alkaline batteries. The Replace Battery indicator flashes in the display. Review Battery Tips 1.
Owner's Manual
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The minimum-off timer is a call during the minimum-off timer, the thermostat flashes "Cool On" or "Heat On"a in the display and the compressor and fan turn on. ________ a Heat Pumps only. 69-1722 14 When the minimum-off timer expires, "Cool On" or "Heat On"a appears solidly in the display. If there is activated after a shutdown. Built-in Compressor Protection The RTH5100B Thermostat has built-in compressor protection (minimum-off timer) that prevents the compressor from restarting too early after the compressor turns off.
The minimum-off timer is a call during the minimum-off timer, the thermostat flashes "Cool On" or "Heat On"a in the display and the compressor and fan turn on. ________ a Heat Pumps only. 69-1722 14 When the minimum-off timer expires, "Cool On" or "Heat On"a appears solidly in the display. If there is activated after a shutdown. Built-in Compressor Protection The RTH5100B Thermostat has built-in compressor protection (minimum-off timer) that prevents the compressor from restarting too early after the compressor turns off.
Owner's Manual
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Troubleshooting Tips Then . . . Display is closed securely. • Wait five minutes for the heating system to respond. • If all of this was checked, contact your local heating and cooling contractor. 69-1722 16 Temperature settings do not change. Heating system does not turn on the battery holder. Check that the temperature settings are installed as marked on . Check that fresh AAA alkaline batteries are : • Heating 40...
Troubleshooting Tips Then . . . Display is closed securely. • Wait five minutes for the heating system to respond. • If all of this was checked, contact your local heating and cooling contractor. 69-1722 16 Temperature settings do not change. Heating system does not turn on the battery holder. Check that the temperature settings are installed as marked on . Check that fresh AAA alkaline batteries are : • Heating 40...
Owner's Manual
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... power switch at the heating and/or cooling system to be sure it is on. • Check the furnace door to be sure it is closed securely. • Wait five minutes for the cooling system to Cool by pressing system does the System button. Check Installer Setup Number 1, Heating and/or Cooling System Type; not turn on. • Check the cool temperature setting to be sure it is set...
... power switch at the heating and/or cooling system to be sure it is on. • Check the furnace door to be sure it is closed securely. • Wait five minutes for the cooling system to Cool by pressing system does the System button. Check Installer Setup Number 1, Heating and/or Cooling System Type; not turn on. • Check the cool temperature setting to be sure it is set...
Owner's Manual
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... Compressor minimum-off timer is active. "Cool On" is Compressor minimum-off timer is active. system to turn on " in the display, but the heating system does not turn on, see "Cooling system does not turn on . If "Heat On" is not shown in the Wait up to Heat and set the temperature setting below the room temperature. flashing in the display. pumps only). "Heat On" is shown solidly in the Troubleshooting Tips. Set...
... Compressor minimum-off timer is active. "Cool On" is Compressor minimum-off timer is active. system to turn on " in the display, but the heating system does not turn on, see "Cooling system does not turn on . If "Heat On" is not shown in the Wait up to Heat and set the temperature setting below the room temperature. flashing in the display. pumps only). "Heat On" is shown solidly in the Troubleshooting Tips. Set...
Owner's Manual
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... installed heat pump. Refer to Installation Instructions, the cool 69-1716. Check and make sure air in Heating, and make sure it is set to Electric Heat (Setting 1).Refer to Installation Instructions, 69-1716 Heat pump Check Installer Setup Number 2, Heat puts out cool Pump Changeover Valve, and make sure the bare portions of the wires are heating and/or cooling system. warm air in a call for heat (electric furnaces only). Fan does not turn on in Refer to running at the Installation Instructions...
... installed heat pump. Refer to Installation Instructions, the cool 69-1716. Check and make sure air in Heating, and make sure it is set to Electric Heat (Setting 1).Refer to Installation Instructions, 69-1716 Heat pump Check Installer Setup Number 2, Heat puts out cool Pump Changeover Valve, and make sure the bare portions of the wires are heating and/or cooling system. warm air in a call for heat (electric furnaces only). Fan does not turn on in Refer to running at the Installation Instructions...
Owner's Manual
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... the installed heating and/or cooling system. Then . . . Refer to Installation Instructions, 69-1716. 69-1722 20 Check Installer Setup Number 1, Heating and/or Cooling System Type, and make sure the setting matches the installed heating and/or cooling system. Heating system does not turn off and the heat temperature setting is set below the room temperature ("Heat On" is running in the display). Troubleshooting Tips (Cont) If . . . Heating system is not shown in cool mode. Refer to Installation Instructions...
... the installed heating and/or cooling system. Then . . . Refer to Installation Instructions, 69-1716. 69-1722 20 Check Installer Setup Number 1, Heating and/or Cooling System Type, and make sure the setting matches the installed heating and/or cooling system. Heating system does not turn off and the heat temperature setting is set below the room temperature ("Heat On" is running in the display). Troubleshooting Tips (Cont) If . . . Heating system is not shown in cool mode. Refer to Installation Instructions...
Owner's Manual
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MODEL NUMBER xxxxxxxx DATE CODE xxxxxx THERMOSTAT BATTERY HOLDER M22178 Limited One Year Warranty... 21 69-1722 Before calling, please have the thermostat model number and date code available. Customer Assistance For assistance with your Honeywell product please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll free at 1-800-468-1502.
MODEL NUMBER xxxxxxxx DATE CODE xxxxxx THERMOSTAT BATTERY HOLDER M22178 Limited One Year Warranty... 21 69-1722 Before calling, please have the thermostat model number and date code available. Customer Assistance For assistance with your Honeywell product please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll free at 1-800-468-1502.
Owner's Manual
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... the following address: Honeywell Return Goods Dock 4 MN10-3860 1885 Douglas Dr N Golden Valley, MN 55422 This warranty does not cover removal or reinstallation costs. Honeywell's sole responsibility shall be free from which occurred while the product was in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the...
... the following address: Honeywell Return Goods Dock 4 MN10-3860 1885 Douglas Dr N Golden Valley, MN 55422 This warranty does not cover removal or reinstallation costs. Honeywell's sole responsibility shall be free from which occurred while the product was in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the...