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. Read and Save these Instructions ® U.S. Registered Trademark © 2004 Honeywell International Inc.
Contents Features........................................................................3 Get to Know Your Thermostat ......................................4 Thermostat...............................................................4 Display .....................................................................5 Operate Your Thermostat .............................................6 Set System Setting ..................................................6 Set Fan Setting .........................................
Features • Large, Clear, Backlit Display: Easy-to-see and read—even in the dark. • Precise Comfort Control: ±1ºF of your set temperature. • Simplified Operation: Soft-key controls. Simultaneously displays both room temperature and temperature setting. • Easy Change Battery Holder. • Built-in Compressor Protection: Minimum-off timer protects compressor from restarting too early after a shutdown.
Get To Know Your Thermostat Thermostat BATTERY HOLDER LATCH DIGITAL DISPLAY PRESS TO RELEASE BATTERY HOLDER.
Get to Know Your Thermostat (Cont) Display INSIDE TEMPERATURE INDICATES BATTERIES ARE LOW AND MUST BE REPLACED Inside Replace Batt HeatCool Setting Fan On Auto Heat On Cool On System Heat Cool Off CURRENT FAN SETTING TEMPERATURE SETTING INDICATES THERMOSTAT IS "CALLING" FOR HEAT OR COOL CURRENT SYSTEM SETTING M22011 5 69-1722
Operate Your Thermostat Set System Setting Press the System button to select Heat, Off or Cool: Heat—Thermostat controls the heating system. Off—Both the heating and cooling systems are off. Cool—Thermostat controls the cooling system. CAUTION Equipment Damage Hazard. Air conditioning compressor damage possible. Do not operate cooling system when outdoor temperature is below 50 °F (10 °C).
Operate Your Thermostat (Cont) Set Fan Setting Press the Fan button to select Auto or On: Auto—Normal setting for most homes.The fan runs only when the heating or cooling system is on. On—The fan runs continuously. Use this setting for improved air circulation or for more efficient air cleaning.
Operate Your Thermostat (Cont) Change Temperature Setting Press the Up or Down button to select the desired temperature setting. TEMPERATURE SETTING PRESS THIS BUTTON TO RAISE THE TEMPERATURE SETTING Replace Batt Service Needed Fan System Auto Cool PRESS THIS BUTTON TO LOWER THE TEMPERATURE SETTING TEMPERATURE SETTING RANGE: HEAT: 40°TO 90°F (4.5°T0 32°C) COOL: 50°TO 99°F (10° T0 37°C) M22014 The first press of the Up or Down button turns on the backlight.
Replace Batteries 1. When the Replace Battery indicator is flashing, replace batteries promptly with two fresh AAA alkaline batteries. REPLACE BATTERY INDICATOR Replace Batt Service Needed Fan System Cool Auto M22015 The thermostat does not lose any settings when the batteries are replaced; all settings are permanently stored in memory.
Replace Batteries (Cont) 2. 3. Press the battery holder latch to release the battery holder. Remove the battery holder from the thermostat.
Replace Batteries (Cont) 4. Remove the old batteries and insert two fresh AAA alkaline batteries as marked on the battery holder.
Replace Batteries (Cont) 5. Insert battery holder as shown.
Review Battery Tips 1. Replace the batteries as soon as Replace Batt flashes in the display. The Replace Battery indicator flashes in the display two months before the batteries run down completely. 2. Always use fresh AAA alkaline batteries. Non-alkaline batteries do not last as long and can leak, causing thermostat damage. 3.
Built-in Compressor Protection The RTH5100B Thermostat has built-in compressor protection (minimum-off timer) that prevents the compressor from restarting too early after a shutdown. The minimum-off timer is activated after the compressor turns off. If there is a call during the minimum-off timer, the thermostat flashes “Cool On” or “Heat On”a in the display. When the minimum-off timer expires, “Cool On” or “Heat On”a appears solidly in the display and the compressor and fan turn on.
Accessory/Replacement Parts 1. Cover Plates—Used to cover marks on the wall Part Number: 50001137-001 (Small) Cover Plate 50002883-001 (Large) Cover Plate To order, call Honeywell Customer Care at 1-800-468-1502. 2. Replacement Battery Holder— Part Number 50000951-001 Battery Holder To order, call Honeywell Customer Care at 1-800-468-1502.
Troubleshooting Tips If . . . Then . . . Display is blank. Check that fresh AAA alkaline batteries are installed as marked on the battery holder. Temperature settings do not change. Check that the temperature settings are: • Heating 40°F to 90°F(4.5°C to 32°C). • Cooling 50°F to 99°F (10°C to 37°C). Heating system does not turn on. • Set the system to Heat by pressing the System button.
Troubleshooting Tips (Cont) If . . . Then . . . Cooling system does not turn on. • Set the system to Cool by pressing the System button. • Check the cool temperature setting to be sure it is set below the room temperature and “Cool On” shows solidly in the display. • Check the circuit breaker to be sure it is not tripped. • Check the 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.
Troubleshooting Tips (Cont) If . . . Then . . . “Heat On” is not shown in the display. Set the System setting to Heat and set the temperature setting above the room temperature. If “Heat On” is shown solidly in the display, but the heating system does not turn on, see “Heating system does not turn on” in theTroubleshooting Tips. “Cool On” is not shown in the display. Set the System setting to Cool and set the temperature setting below the room temperature.
Troubleshooting Tips (Cont) If . . . Then . . . Fan does not turn on in a call for heat (electric furnaces only). Check Installer Setup Number 3, Fan Control in Heating, and make sure it is set to Electric Heat (Setting 1).Refer to Installation Instructions, 69-1716 Heat pump puts out cool air in the heat mode and warm air in the cool mode (heat pumps only). Check Installer Setup Number 2, Heat Pump Changeover Valve, and make sure the setting matches the changeover required by the installed heat pump.
Troubleshooting Tips (Cont) If . . . Then . . . Heating system is running in cool mode. Check Installer Setup Number 1, Heating and/or Cooling System Type, and make sure the setting matches the installed heating and/or cooling system. Refer to Installation Instructions, 69-1716. Heating system does not turn off and the heat temperature setting is set below the room temperature (“Heat On” is not shown in the display).
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. Before calling, please have the thermostat model number and date code available.
Limited One-Year 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 defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option) within a reasonable period of time.
Limited One-Year Warranty (Cont) 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.
Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 69-1722 G.H. 5-04 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 www.honeywell.
