Owner's Manual
Page 2
Call 1-800-468-1502 for the most common system We are here to help. Installation is preset for wiring assistance before returning the thermostat to the store. 69-2210EF-03 ii It 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 -
Call 1-800-468-1502 for the most common system We are here to help. Installation is preset for wiring assistance before returning the thermostat to the store. 69-2210EF-03 ii It 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 -
Owner's Manual
Page 4
Old thermostat Cover 69-2210EF-03 2 M28099 2 Remove Old Thermostat Remove old thermostat but leave wallplate with wires attached. If so, see back cover for proper disposal instructions. Leave wallplate in place Is there a sealed tube containing mercury?
Old thermostat Cover 69-2210EF-03 2 M28099 2 Remove Old Thermostat Remove old thermostat but leave wallplate with wires attached. If so, see back cover for proper disposal instructions. Leave wallplate in place Is there a sealed tube containing mercury?
Owner's Manual
Page 5
3 Label Wires with Tags Label the wires using the supplied wire labels as you disconnect them. Wire Labels M28100 M28093 3 69-2210EF-03
3 Label Wires with Tags Label the wires using the supplied wire labels as you disconnect them. Wire Labels M28100 M28093 3 69-2210EF-03
Owner's Manual
Page 9
See page 21. See page 14. Call 1-800-468-1502 for wiring assistance. 7 69-2210EF-03 Remove metal jumper if you have both R and Rc wires. We are here to help. 7 Connect Wires Simply match wire labels. Have a Heat Pump system? M27513 Labels don't match?
See page 21. See page 14. Call 1-800-468-1502 for wiring assistance. 7 69-2210EF-03 Remove metal jumper if you have both R and Rc wires. We are here to help. 7 Connect Wires Simply match wire labels. Have a Heat Pump system? M27513 Labels don't match?
Owner's Manual
Page 14
Advanced Installation System setup 13 Wiring 21 Troubleshooting 22 Customer assistance 25 Limited warranty 26
Advanced Installation System setup 13 Wiring 21 Troubleshooting 22 Customer assistance 25 Limited warranty 26
Owner's Manual
Page 15
M28349 Press NEXT to advance to change settings. RTH6400 ASybsotuetmyosuertunpew thermostat Press and hold the s and FAN buttons until the screen changes (approximately 5 seconds). SETUP WIRING ASSISTANCE M28348 Press s or t to next function. 13 69-2210EF-03 TROUBLESHOOTING Function 1 Setting 0 Done Next Press DONE to exit and save settings.
M28349 Press NEXT to advance to change settings. RTH6400 ASybsotuetmyosuertunpew thermostat Press and hold the s and FAN buttons until the screen changes (approximately 5 seconds). SETUP WIRING ASSISTANCE M28348 Press s or t to next function. 13 69-2210EF-03 TROUBLESHOOTING Function 1 Setting 0 Done Next Press DONE to exit and save settings.
Owner's Manual
Page 16
... 14 TROUBLESHOOTING SETUP Advanced Installation Guide Function 1: System type Press the s or t button to select the type of system you have in your home: 10 WIRING ASSISTANCE Done Next M28350 0 Heating & cooling: Gas, oil or electric heating with central air conditioning. 1 Heat pump: Outside compressor provides both heating and cooling. 2 Heating...
... 14 TROUBLESHOOTING SETUP Advanced Installation Guide Function 1: System type Press the s or t button to select the type of system you have in your home: 10 WIRING ASSISTANCE Done Next M28350 0 Heating & cooling: Gas, oil or electric heating with central air conditioning. 1 Heat pump: Outside compressor provides both heating and cooling. 2 Heating...
Owner's Manual
Page 17
... M28352 0 Cooling changeover valve: Use this setting if you connected a wire labeled "O" to the O/B W wire terminal (see page 21). 1 Heating changeover valve: Use this setting if you connected a wire labeled "B" to the O/B W wire terminal (see page 21). ASSISTANCE TROUBLESHOOTING Press to display next function. SETUP WIRING RTH6400 Function 2: Heat pump changeover valve Press the s or t button...
... M28352 0 Cooling changeover valve: Use this setting if you connected a wire labeled "O" to the O/B W wire terminal (see page 21). 1 Heating changeover valve: Use this setting if you connected a wire labeled "B" to the O/B W wire terminal (see page 21). ASSISTANCE TROUBLESHOOTING Press to display next function. SETUP WIRING RTH6400 Function 2: Heat pump changeover valve Press the s or t button...
Owner's Manual
Page 18
M28351 69-2210EF-03 16 ASSISTANCE TROUBLESHOOTING Press to display next function. When correct setting is selected, press NEXT to change setting. SETUP WIRING Advanced Installation Guide Function 3: Heating fan control Press the s or t button to select your heating system and fan operation: NOTE: If Function 3 does not appear, ...
M28351 69-2210EF-03 16 ASSISTANCE TROUBLESHOOTING Press to display next function. When correct setting is selected, press NEXT to change setting. SETUP WIRING Advanced Installation Guide Function 3: Heating fan control Press the s or t button to select your heating system and fan operation: NOTE: If Function 3 does not appear, ...
Owner's Manual
Page 19
M28351 17 69-2210EF-03 TROUBLESHOOTING SETUP RTH6400 Function 5: Heating cycle rate Press the s or t button to select your heating system and optimize its operation: NOTE: If Function 5 does not appear, please turn to the next page to change setting. Press to continue. 55 WIRING ASSISTANCE Done Next M28354 5 Gas or oil furnace...
M28351 17 69-2210EF-03 TROUBLESHOOTING SETUP RTH6400 Function 5: Heating cycle rate Press the s or t button to select your heating system and optimize its operation: NOTE: If Function 5 does not appear, please turn to the next page to change setting. Press to continue. 55 WIRING ASSISTANCE Done Next M28354 5 Gas or oil furnace...
Owner's Manual
Page 20
..., press NEXT to change setting. TROUBLESHOOTING Press to display next function. CAUTION: To avoid possible compressor damage, set to select Manual or Auto Changeover: 12 0 WIRING ASSISTANCE Done Next M28355 0 Manual Changeover: (Heat/Off/Cool) 1 Automatic Changeover: (Heat/Off/Cool/Auto) Automatically turns on heat or cool based on room temperatures...
..., press NEXT to change setting. TROUBLESHOOTING Press to display next function. CAUTION: To avoid possible compressor damage, set to select Manual or Auto Changeover: 12 0 WIRING ASSISTANCE Done Next M28355 0 Manual Changeover: (Heat/Off/Cool) 1 Automatic Changeover: (Heat/Off/Cool/Auto) Automatically turns on heat or cool based on room temperatures...
Owner's Manual
Page 21
When correct setting is selected, press NEXT to change setting. Press to display next function. SETUP WIRING RTH6400 Function 13: Smart Response® Technology Press the s or t button to select Smart Response® Technology: 13 1 Done Next M28356 1 Smart Response® Technology ON 0 Smart Response® Technology OFF NOTE: See Operating Manual for information on Smart Response® Technology. M28351 ASSISTANCE TROUBLESHOOTING 19 69-2210EF-03
When correct setting is selected, press NEXT to change setting. Press to display next function. SETUP WIRING RTH6400 Function 13: Smart Response® Technology Press the s or t button to select Smart Response® Technology: 13 1 Done Next M28356 1 Smart Response® Technology ON 0 Smart Response® Technology OFF NOTE: See Operating Manual for information on Smart Response® Technology. M28351 ASSISTANCE TROUBLESHOOTING 19 69-2210EF-03
Owner's Manual
Page 22
M28351 ASSISTANCE TROUBLESHOOTING 69-2210EF-03 20 When correct setting is selected, press DONE to change setting. SETUP WIRING Advanced Installation Guide AFubnocuttioynou1r4n: eTwemthpermatousrteadt isplay Press the s or t button to select Fahrenheit or Celsius temperature display: 14 0 Done Next 0 Fahrenheit temperature display (°F) 1 Celsius temperature display (°C) M28357 Press to exit and save changes.
M28351 ASSISTANCE TROUBLESHOOTING 69-2210EF-03 20 When correct setting is selected, press DONE to change setting. SETUP WIRING Advanced Installation Guide AFubnocuttioynou1r4n: eTwemthpermatousrteadt isplay Press the s or t button to select Fahrenheit or Celsius temperature display: 14 0 Done Next 0 Fahrenheit temperature display (°F) 1 Celsius temperature display (°C) M28357 Press to exit and save changes.
Owner's Manual
Page 23
Wrap B wire with electrical tape. 21 69-2210EF-03 Do not use . Do not connect both R and Rc terminals, remove metal jumper (see notes, below and connect to terminal as shown here (see page 6). Connect O wire to both O and B if you have a heat pump. Wrap bare end of wire with electrical tape and do not match letters on the thermostat, check the chart below ). RTH6400 Wiring If labels do not use C, X or B. SETUP WIRING ASSISTANCE TROUBLESHOOTING M28418 If wires will be connected to O/B W.
Wrap B wire with electrical tape. 21 69-2210EF-03 Do not use . Do not connect both R and Rc terminals, remove metal jumper (see notes, below and connect to terminal as shown here (see page 6). Connect O wire to both O and B if you have a heat pump. Wrap bare end of wire with electrical tape and do not match letters on the thermostat, check the chart below ). RTH6400 Wiring If labels do not use C, X or B. SETUP WIRING ASSISTANCE TROUBLESHOOTING M28418 If wires will be connected to O/B W.
Owner's Manual
Page 24
...° to 99°F (10° to 37°C). Temperature Make sure heating and cooling settings do not temperatures are correctly installed (see page 7). SETUP WIRING Advanced Installation Guide Troubleshooting If you have difficulty with your to Cool heating and cooling equipment (see page 14).
...° to 99°F (10° to 37°C). Temperature Make sure heating and cooling settings do not temperatures are correctly installed (see page 7). SETUP WIRING Advanced Installation Guide Troubleshooting If you have difficulty with your to Cool heating and cooling equipment (see page 14).
Owner's Manual
Page 25
Make sure the temperature is set lower than the Inside respond temperature. • Press SYSTEM button to set system to Cool. SETUP WIRING Troubleshooting RTH6400 Heating or • Press SYSTEM button to set system cooling system to respond. Wait 5 minutes for the system to restart safely, without damage to make ...
Make sure the temperature is set lower than the Inside respond temperature. • Press SYSTEM button to set system to Cool. SETUP WIRING Troubleshooting RTH6400 Heating or • Press SYSTEM button to set system cooling system to respond. Wait 5 minutes for the system to restart safely, without damage to make ...
Owner's Manual
Page 26
... cooling equipment (see page 14). Heating system• Check Function 1: System Type to is running at the make sure turn off) bare wires are not touching each other (see page 14). WIRING ASSISTANCE TROUBLESHOOTING 69-2210EF-03 24 same time (or • Grasp and pull thermostat away heat does not from wallplate.
... cooling equipment (see page 14). Heating system• Check Function 1: System Type to is running at the make sure turn off) bare wires are not touching each other (see page 14). WIRING ASSISTANCE TROUBLESHOOTING 69-2210EF-03 24 same time (or • Grasp and pull thermostat away heat does not from wallplate.
Owner's Manual
Page 27
...50002883-001 *Use to cover marks left by old thermostats. SETUP ACbuosutotmyoeur ransseiwsttahnecremostat RTH6400 For assistance with this product, please visit http://DIYthermostats.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502. Accessories/replacement parts To order..., please 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. WIRING...
...50002883-001 *Use to cover marks left by old thermostats. SETUP ACbuosutotmyoeur ransseiwsttahnecremostat RTH6400 For assistance with this product, please visit http://DIYthermostats.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502. Accessories/replacement parts To order..., please 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. WIRING...