User Guide
Wi-Fi Touchscreen
Programmable Thermostat
RTH8500 Wi-Fi Series
In the box you will find
•Thermostat
•Wallplate (attached to thermostat)
•Screws and anchors
•Coin cell battery (inside the back of the thermostat)
•Quick Start Guide
•Thermostat ID Card
•Wire labels
•User Guide
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Welcome
Congratulations on your purchase of a Honeywell Wi-Fi touchscreen programmable thermostat. When registered to Honeywell’s Total Connect Comfort Solutions, you can remotely monitor and control the heating and cooling system in your home or business—you can stay connected to your comfort system wherever you go.
Honeywell’s Total Connect Comfort is the perfect solution if you travel frequently, own a vacation home, a business or manage an
Investment property or if you are simply looking for peace of mind.
This thermostat works with common 24 volt systems such as forced air, hydronic, heat pump, oil, gas, and electric. It will not work with millivolt systems, such as a gas fireplace, or with 120/240 volt systems such as baseboard electric heat.
This thermostat contains a Lithium battery which may contain Perchlorate material. Perchlorate Material—special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. Contact the Thermostat Recycling Corporation at www. thermostat-recycle.org or 1-800-238-8192 for information on how and where to properly and safely dispose of your old thermostat.
NOTICE: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50°F (10°C).
Need help?
Visit wifithermostat.com or call 1-855-733-5465 for assistance before returning the thermostat to the store.
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Table of contents |
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About your new thermostat |
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Home screen quick reference...................... |
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Preset energy-saving schedules................. |
6 |
Installation |
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Installing your thermostat............................ |
8 |
Connecting to your Wi-Fi network............. |
26 |
Registering your thermostat online............ |
31 |
Operation |
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Setting the clock........................................ |
36 |
Setting the fan........................................... |
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Selecting system mode............................. |
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Adjusting program schedules.................... |
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Overriding schedules temporarily.............. |
40 |
Overriding schedules permanently............ |
41 |
Setting vacation hold................................. |
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Setting filter reminder intervals.................. |
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Cleaning the screen................................... |
44 |
Unregistering thermostat........................... |
45 |
Disconnecting Wi-Fi................................... |
46 |
Special features......................................... |
48 |
Setting functions and options.................... |
51 |
Appendices |
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Frequently asked questions....................... |
59 |
Message center messages........................ |
62 |
Troubleshooting......................................... |
65 |
Limited warranty........................................ |
71 |
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Features of your Wi-Fi thermostat
With your new thermostat, you can:
•Connect to the Internet to monitor and control your heating/cooling system
•View and change your heating/cooling system settings
•View and set temperature and schedules
•Receive alerts via email and get automatic upgrades
Your new thermostat provides:
•Smart Response Technology
•Compressor protection
•Heat/cool auto changeover
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Home screen quick reference
Once your Wi-Fi thermostat is installed, it will display the home screen. Portions of this display will change depending on how you are viewing it. To change settings, simply press the appropriate area lightly with your finger.
Message center |
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Wi-Fi status |
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Inside |
Select fan mode Select system mode Program schedules
Override schedule
MORE
Set clock
Schedule is on (does not display when off)
Additional settings
Lock screen for cleaning
Unless you change the lighting function, the screen is always lit at low intensity. When you touch the screen, the screen brightens.
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Preset energy-saving schedules
This thermostat is pre-set with energy-saving program settings for four time periods. Using the default settings can reduce your heating/cooling expenses if used as directed. Savings may vary depending on geographic region and usage.
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Default Heat Settings |
Default Cool Settings |
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WAKE |
70 ° |
78 ° |
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6:00 am |
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LEAVE |
62 ° |
85 ° |
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8:00 am |
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RETURN |
70 ° |
78° |
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6:00 pm |
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SLEEP |
62 ° |
82 ° |
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10:00 pm |
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To change the settings, see pages 39–42.
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Setting up your thermostat
Setting up your Wi-Fi programmable touchscreen thermostat is easy. It is preprogrammed and ready to go as soon as it is installed and registered.
1Install your thermostat.
2Connect it to your home wireless network.
3Register online for remote access.
Before you begin, you may want to watch a brief installation video. Use the QR Code® at the front of this guide, or go to wifithermostat.com/support
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Installing your thermostat
You might need the following tools to install this thermostat:
•No. 2 Phillips screwdriver
•Small pocket screwdriver
•Pencil
•Level (optional)
•Drill and bits (3/16” for drywall, 7/32” for plaster) (optional)
•Hammer (optional)
•Electrical tape (optional)
1 Switch OFF power to your
heating/cooling system.
or
Important! To protect your equipment, switch OFF the power to your heating/ cooling system at the breaker box or
the system switch.
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Circuit |
Heating/cooling |
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breaker |
system power |
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box |
switch |
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Installing your thermostat
2Remove old thermostat faceplate and leave wires connected.
2a Take a picture of the wire connections for later reference.
2b If no wire is connected to a terminal labeled C or no C terminal exists on the old thermostat, view the Alternate Wiring videos at wifithermostat.com/videos
Important! C wire is required and is the primary power source for your thermostat. Without a C wire, your thermostat will not power up.
If you have an older thermostat with a sealed mercury tube, turn to page 2 for proper disposal instructions.
C
C
Terminal designation
9
Installing your thermostat
3Label wires.
Do not label by wire color. Use the supplied sticky tags to label each wire as you disconnect it. Label wires according to the old thermostat terminal designations, not by wire color.
Note: If no tag matches a terminal designation, write the appropriate letter on a blank sticky tag.
4 Remove wallplate.
Remove the old wallplate from the wall after all wires have been labeled and disconnected.
C
C
Sticky tag
Blank tags
Terminal designation
10
Installing your thermostat
5 Separate Wi-Fi thermostat and its |
Finger holds |
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wallplate. |
Thermostat |
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On your new thermostat, grasp the |
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finger holds on the top and bottom of |
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the wallplate with one hand and the |
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thermostat (front) with the other hand. |
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Pull pieces apart. |
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Wallplate (back view)
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Installing your thermostat
6Mount wallplate for Wi-Fi thermostat.
Mount your new wallplate using screws and anchors included with the thermostat.
If necessary:
Drill 3/16-in holes for drywall.
Drill 7/32-in holes for plaster.
Note: You may be able to use your existing wall anchors. Hold the wallplate up to the existing anchors to check for alignment.
Wallplate
HEAT PUMP
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CONVENTIONAL |
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Y2 |
RC |
RC |
L |
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R |
R |
E/AUX |
W2 |
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O/B |
K |
K |
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Y |
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G |
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C |
W
R
G
12
Installing your thermostat
Important! The Wi-Fi thermostat requires a C wire to operate. The C, or common, wire brings 24 VAC power to the thermostat. Many older mechanical or battery operated thermostats do not require a C wire. If you don’t have a C wire, try:
•Looking for an unused wire that is pushed into the wall. Connect that wire to C and check that it is connected to the 24 VAC common at your heating/cooling system. Check the video section at wifithermostat.com
Note: Not all heating/cooling systems label the 24 VAC common C. Check your system manual or contact the manufacturer to find out which terminal is the 24 VAC common.
View the Alternate Wiring videos at wifithermostat.com/videos
Wiring
For conventional heating/cooling systems (natural gas, oil or electric furnace, air conditioner), see page 14. See “Glossary” on page 68 for further definition.
For a heat pump system, see page 15. See “Glossary” on page 68 for further
definition.
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Installing your thermostat
Wiring (conventional system)
7A Wire the Wi-Fi thermostat to your conventional system.
aStarting with the C Wire, match the sticky tag on the wire to the terminal labels.
Remove metal jumper only if you have both R and RC wires
HEAT PUMP
You must have a C wire. See page 13.
bLoosen screw, insert wire on inside edge of terminal, then tighten screw.
cVerify wire is firmly secured by gently pulling on wire.
dRepeat steps a–c for all other wires.
ePush any excess wire back into the wall opening after all wires are installed.
fContinue to page 20.
Labels don’t match? See alternate
wiring key on pages 16–17.
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CONVENTIONAL |
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Y2 |
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RC |
RC |
L |
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R |
R |
R |
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E/AUX |
W2 |
W |
W |
O/B |
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K |
K |
Y |
Y |
Y |
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G |
G |
G |
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C |
C |
C |
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Note: The wiring for your application might be different than the wiring from above.
Installing your thermostat
Wiring (heat pump system only)
7B Wire Wi-Fi thermostat to your heat pump.
Labels don’t match? See alternate wiring key on pages 18–19.
a Starting with the C Wire, match the sticky tag on the wire to the terminal labels.
You must have a C wire. See page 13.
bLoosen screw, insert wire on inside edge of terminal, then tighten screw.
cVerify wire is firmly secured by gently pulling on wire.
dRepeat steps a–c for all other wires.
ePush any excess wire back into the wall opening after all wires are installed.
fContinue to page 20.
Note: If old thermostat has separate wires on AUX and E, place both wires into the E/AUX terminal. If old thermostat has wire on AUX with a jumper to E, place wire on E/AUX terminal. No jumper is required.
HEAT PUMP
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RC |
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L |
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R |
R |
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O |
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E/AUX |
AUX |
O/B |
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Y |
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K |
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Y |
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G |
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G |
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C |
C |
Note: The wiring for your application might be different than the wiring from above.
15
Installing your thermostat
Alternate wiring (conventional system)
Use this if your wire labels don’t match the terminal labels.
Note: You must have a C wire or equivalent. See page 13.
CONVENTIONAL
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Y2 |
Y2 |
RC |
RC |
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R |
R |
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W2 |
W2 |
W |
W |
3 |
K |
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Y |
Y |
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G |
G |
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C |
C |
Metal Jumper
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2
See key to 1 – 3 on page 17.
16
Installing your thermostat
Alternate wiring key (conventional system)
1Remove metal jumper connecting R and RC only if you must connect both R and RC.
2If 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.
3Do not use K terminal. For future use.
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Installing your thermostat
Alternate wiring (heat pump system only)
Use this if your wire labels don’t match the terminal labels.
Note: You must have a C wire or equivalent. See page 13.
5 L
6 E/AUX
7 K
HEAT PUMP
Metal Jumper
RC
Y2
R
AUX
O
Y
G
C
RC 1
R 2
O/B 3
Y 4
G
C 3
MCR33530A
See key to 1 – 7
on page 19.
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Installing your thermostat
Alternate wiring key (heat pump system only)
1Leave metal jumper between R and RC terminals in place.
2If your old thermostat had both V and VR wires, check wifithermostat.com for help.
3If your old thermostat had separate O and B wires, attach the B wire to the C terminal. If another wire is attached to the C terminal, check wifithermostat.com for help. Attach the O wire to the O/B terminal. Set System Function 0190 to 0 (see page 55).
If your old thermostat had an O wire and not a B wire, attach the O wire to the O/B terminal.
4If your old thermostat had separate Y1, W1 and W2 wires, check wifithermostat.com for help.
5This is the system monitor. If the monitor finds a problem, you will see a red light in the upper right corner of the thermostat (shines through the cover).
6If old thermostat has separate wires on AUX and E, place both wires into the E/AUX terminal. If old thermostat has wire on AUX with a jumper to E, place wire on E/AUX terminal. No jumper is required.
7Do not use K terminal. For future use.
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Installing your thermostat
8Install battery.
Insert the coin cell battery
(included), observing the correct polarity.
Note: A correctly inserted battery will extend about halfway out of the battery slot on the thermostat, allowing for easier removal.
This battery maintains time and |
Thermostat interior |
date during power outages. It |
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(C wire required). |
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Installing your thermostat
9 Attach thermostat to wallplate. |
Wallplate |
Align the thermostat to the wallplate and then snap into place.
HEAT PUMP
CONVENTIONAL |
L |
AUX |
/E |
K |
Thermostat
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Installing your thermostat
10 Switch heating/cooling system ON.
Important!
10a Verify that the C wire is connected at the thermostat and at the heating/cooling system.
10b Make sure the heating/ cooling system door is firmly secured.
10c Switch power back ON for your heating/cooling system at the breaker box or its power switch.
or
Circuit |
Heating/cooling |
breaker |
system power |
box |
switch |
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Installing your thermostat
11 Set date and time.
Touch σ or τ buttons to change |
Year |
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displayed time and date. |
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Press and hold a button to quickly |
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change a setting. |
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Note:This thermostat will |
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automatically update for daylight |
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saving time (if observed in your area) |
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and all date/time information is stored. |
Time |
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If the thermostat is connected to |
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Wi-Fi and registered to Total Connect |
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Comfort, the current time is updated |
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from the internet. |
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Day
Month
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Installing your thermostat
12 Determine your heating/cooling system type.
Important! Heating/cooling system type must be set so that your thermostat operates properly and does not damage your system.
12a If you have a traditional system (natural gas forced air with A/C), your hermostat is set up by default to control this system.
12b If your system is:
•Conventional multistage heat and cool
•Any type of heat pump
•Hydronic
•Other
If you are not sure of your heating/cooling system type or have other questions, go to wifithermostat.com
You MUST change the system type by setting system function 0170. See page 54 to match your thermostat to your system type.
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Installing your thermostat
Congratulations! Your thermostat is operational. 13 Test your thermostat.
13a Press the SYSTEM button to change to heating or cooling and begin operation.
13b For remote access to your thermostat, continue to “Connecting to your Wi-Fi network” on page 26.
Inside
MORE |
MCR31580 |
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Heating/cooling system not turning on? Refer to page 67 or FAQ at wifithermostat.com/support
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Connecting to your Wi-Fi network
To complete this process, you must have a wireless device connected to your home wireless network. Any of these device types will work:
•Tablet (recommended)
•Laptop (recommended)
•Smartphone
If you get stuck... at any point in this procedure, restart the thermostat by removing the thermostat from the wallplate, wait for 5 seconds, and snap it back onto the wallplate. Return to Step 1 in this procedure, which starts on page 27.
View the Wi-Fi Enrollment video at wifithermostat.com/videos
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Connecting to your Wi-Fi network
1Connect to your thermostat.
1a Make sure the thermostat message center displays Wi-Fi SETUP.
1b On the wireless device (laptop, tablet, smartphone), view the list of available Wi-Fi networks
1c Connect to the network called
NewThermostat_123456 (the number will vary).
Note: If you are asked to specify a home, public, or office network, select Home Network.
Inside
MORE
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Connecting to your Wi-Fi network
2Join your home network.
2a Open your web browser to access the Thermostat Wi-Fi Setup page. The browser should automatically direct you to the correct page; if it does not, go to http://192.168.1.1
2b Find the name of your home network on this page and select it.
Note: Some routers have enhanced features such as guest networks; use your home network
2c Complete the instructions for joining your Wi-Fi network and click on the Connect button. (Depending on your network setup, you may see
an instruction such as Enter Password for your home network.)
Note: If you did not correctly connect to the thermostat, you may see your home router page. If so, return to Step 1.
M31567
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