Honeywell T10 Pro Smart User manual

Package Includes:
• T10 Pro Smart Thermostat
• UWP™ Mounting System
• Standard Installation Adapter (J-box
adapter)
• Cover Plate – Medium: Size 511/64" X
51/2” X 11/16" (131.4 mm x 139.7 mm
x 17.5 mm)
• RedLINK Wireless Indoor Air Sensor
(QTY 1)
• Screws and Anchors
• Professional Install Guide
• Getting Started Guide
THX321WF2001W depicted.
Other models may vary.
T10 Pro Smart
Thermostat with
RedLINK™
THX321WFS20 01W
Programmable Thermostat
Professional Install Guide
Read before installing
33-00423EFS-03
Compatibility
• Compatible with most heating, cooling, and heat pump systems
• Required: 24 VAC power (“C” wire)
• Does not work with electric baseboard heat (120240V)
• Does not work with millivolt systems
• Android or iOS smartphone or tablet
Customer assistance
WEB honeywellhome.com
PHONE 18006333991

2
UWP Mounting System installation
1. Open package to find the UWP. See
Figure 1.
2. Position the UWP on the wall. Level and
mark hole positions. See Figure 2.
Drill holes at marked positions, and
then lightly tap supplied wall anchors
into wall using a hammer.
‒Drill 7/32” holes for drywall.
3. Pull the door open and insert wires
through wiring hole of the UWP. See
Figure 3.
4. Place the UWP over the wall anchors.
Insert and tighten mounting screws
supplied with the UWP. Do not
overtighten. Tighten until the UWP
no longer moves. Close the door. See
Figure 4.
1
2
3
4
Optional Cover Plate installation
Use the Optional Cover Plate when:
• Mounting the thermostat to an
electrical junction box
• Or when you need to cover paint gap
from the old thermostat.
5. Separate the Junction Box Adapter
from the Cover Plate. See Figure 5.
6. Mount the Junction Box Adapter to
the wall or an electrical box using any
of the eight screw holes. Insert and
tighten mounting screws supplied with
Cover Plate Kit. Do not overtighten.
Make sure the Adapter Plate is level.
See Figure 6.
7. Attach the UWP by hanging it on the
top hook of the Junction Box Adapter
and then snapping the bottom of the
UWP in place. See Figure 7.
8. Snap the Cover Plate onto the
Junction Box Adapter. See Figure 8.
Use 3x supplied
screws #8 11/2”
Use 2x
supplied
screws
#6 5/8”
1/4” to 3/8”
1
2
3 4
1 2
3
4
8
7
6
5
M37809

3
Terminal designations
Conventional Systems Heat pump systems
Terminal Description Terminal Description
S/S Input for a wired indoor,
outdoor sensor S/S Input for a wired indoor, outdoor sensor
Y Compressor Stage 1 Y Compressor Stage 1
Y2 Compressor Stage 2 Y2 Compressor Stage 2
G Fan Relay G Fan Relay
C24VAC Common wire from secondary side of cooling
transformer (if 2 transformers) C24VAC Common wire from
secondary side of cooling
transformer
K* Connect to K on C-wire
adaptor K* Connect to K on C-wire adaptor
U/U** Relay for humidifier,
dehumidifier, or ventilator U/U** Relay for humidifier, dehumidifier, or ventilator
A L/A Connect to compressor
monitor
W Heat Stage 1 O/B Changeover valve for heat
pumps
W2 Heat Stage 2 Aux Backup Heat
E Emergency Heat
R 24 VAC Heating transformer R 24 VAC Heating transformer
Rc 24 VAC Cooling transformer Rc 24 VAC Cooling transformer
* The THP9045A1098 C-wire adaptor is used on heat/cool systems when you only have four wires at
the thermostat and you need a fifth wire for a common wire. Use the K terminal in place of the Y and
G terminals on conventional or heat pump systems to provide control of the fan and the compressor
through a single wire—the unused wire then becomes your common wire. See THP9045 instructions
for more information.
** See note on Wiring U terminals on the following page.
Wiring UWP
Push down on the tabs to put the wires into the inner holes of their corresponding
terminals on the UWP (one wire per terminal) until they are firmly in place. Gently
tug on the wires to verify they are secure. If you need to release the wires again,
push down the terminal tabs on the sides of the UWP.
This wiring is just an example,
yours may vary.

4
Setting Slider Tabs
Set R Slider Tab, see Figure 9.
• Use built-in jumper (R Slider Tab)
to differentiate between one or two
transformer systems.
• If there is only one R wire, and it is
connected to the R, Rc, or RH terminal
on the old thermostat, set the slider to
the up position (1 wire).
• If there is one wire connected to the R
terminal and one wire connected to the
Rc terminal, set the slider to the down
position (2 wires).
Set U Slider Tab, see Figure 10.
• Use built-in jumper (U Slider Tab) for
IAQ device.
• When the U Slider Tab is in the down
position (2 wires) the U contacts are a
dry set of contacts.
• If your IAQ device is powered by the
cooling transformer, move the U Slider
Tab to the up position (1 wire). When
this is done, the lower U terminal is
internally jumped to the Rc terminal.
In this application, you would hook
up one wire from your IAQ device to
the upper U terminal and the other
to the common side of the cooling
transformer. The 1 wire setting is most
commonly used when using a fresh
air damper for ventilation or using low
speed fan for dehumidification.
• See wiring examples on the next page.
10
9

5
Whole house humidifier, dehumidifier, or ventilator
Using U Slider Tab
Wired to humidifier,
dehumidifier or ventilator
with built-in transformer.
Wired to fresh air damper
powered by furnace
transformer.
11 12
Damper
C from furnace
or air-handler
Humidifier,
dehumidifier,
or ventilator
Wired to humidifier, ventilator,
or damper powered by external
transformer
Wired to low speed fan
terminal on HVAC for
dehumidification
13 14
Humidifier,
dehumidifier,
or ventilator
R from 24 volt
transformer
C (common) from
24 volt transformer
Dehumidifier*
Furnace or
air-handler
* Label for this terminal
varies by equipment

6
* This thermostat requires a C-Wire. If a C-Wire is not available, use C-Wire adapter accessory
THP9045A1098.
Wiring
1H/1C System (1 transformer)
RPower
Rc [R+Rc joined by Slider Tab]
YCompressor contactor
C* 24VAC common
WHeat relay
GFan relay
NOTES:
1. Use 18 to 22 gauge thermostat wire. Shielded cable is not required.
2. Set the R Slider Tab on the UWP to the up position (1 wire) for 1 transformer
systems or the down position (2 wires) for 2 transformer systems. See "Setting
Slider Tabs" on page 4.
3. Set the U Slider Tab as shown in the diagrams on page 4.
Conventional systems
1H/1C System (2 transformers)
RPower (heating transformer)
Rc Power (cooling transformer)
YCompressor contactor
C* 24 VAC common from cooling transformer
WHeat relay
GFan relay
2H/2C System (1 transformer)
RPower
Rc [R+Rc joined by Slider Tab]
Y Compressor contactor (stage 1)
C* 24VAC common
WHeat relay (stage 1)
GFan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
Hot Water Relay Panel
RPower
Rc [R+Rc joined by Slider Tab]
WHeat Relay
C* 24VAC common
Heat-only System with Fan
RPower
Rc [R+Rc joined by Slider Tab]
C* 24VAC common
WHeat relay
GFan relay
Cool-only System with Fan
RPower
Rc [R+Rc joined by Slider Tab]
YCompressor contactor
C* 24VAC common
GFan relay
NOTE: If the panel does not provide 24 volts AC
at R and C, set the slider to down position and
wire a separate transformer to Rc and C.

7
Heat pumps systems
1H/1C Heat Pump System
RPower
Rc [R+Rc joined by Slider Tab]
YCompressor contactor
C* 24VAC common
O/B Changeover valve
GFan relay
2H/1C Heat Pump System
RPower
Rc [R+Rc joined by Slider Tab]
YCompressor contactor
C* 24VAC common
O/B Changeover valve
GFan relay
Aux Auxiliary heat**
EEmergency heat relay**
LHeat pump fault input
2H/2C Heat Pump System
RPower
Rc [R+Rc joined by Slider Tab]
YCompressor contactor (stage 1)
C* 24VAC common
O/B Changeover valve
GFan relay
Y2 Compressor contactor (stage 2)
LHeat pump fault input
3H/2C Heat Pump System
RPower
Rc [R+Rc joined by Slider Tab]
YCompressor contactor (stage 1)
C* 24VAC common
O/B Changeover valve
GFan relay
Aux Auxiliary heat**
EEmergency heat relay**
Y2 Compressor contactor (stage 2)
LHeat pump fault input
* This thermostat requires a C-Wire. If a C-Wire is not available, use C-Wire adapter accessory
THP9045A1098.
** If you do not have separate wires for the Aux and E terminals, connect the wire to the Aux terminal.
NOTE: Do NOT use Wfor heat pump applications. Auxiliary heat must wire to AUX or E.

8
Mounting thermostat
1. Push excess wire back into the wall opening.
2. Close the UWP door. It should remain
closed without bulging.
3. Align the UWP with the thermostat, and
push gently until the thermostat snaps in
place.
Note: If you used the Optional Cover Plate
shown on page 2, remove the gray trim
ring from the thermostat before step 3. Then
align the thermostat with cover plate and push
gently until the thermostat snaps into place.
Note: If needed, gently pull to remove the
thermostat from the UWP
Installer setup
The display will walk you through equipment setup,
connecting to wireless sensors and connecting to
WiFi.
The final step in the setup is a place you can enter
your company name and contact information as
well as your Contractor PRO™ number.
That contact information will be displayed with
alert or reminder messages to keep you connected
to your customer.
Enter your company’s Contractor PRO™ account
number to participate in periodic promotions. Earn
incentives such as bonus points for every T10
Pro Smart thermostat you install during eligible
promotional periods. Your account number is
an 8-digit number that includes a leading zero
(example 01234567).
For questions on this bonus or membership to the
Contractor PRO™ loyalty program, contact us at
18009194835 or [e-mail].
Welcome!

9
How to use your thermostat
The screen will wake up by pressing the center area of the displayed temperature.
74
2
18%
Indoor Temperature
Displays the current
indoor temperature.
Adjust Temperature
Touch the up and
down arrows to
set your desired
temperature.
Current Priority
Displays the type of
priority and number
of rooms being
prioritized.
Menu
Contains features
such as mode, fan,
schedule, priority,
and other thermostat
settings.
Indoor Humidity
Displays the current
indoor humidity.
Desired
Temperature
Displays the desired
temperature.

10
72 72
72 72
72 72
72 72
How to use Priority
Priority creates an average temperature in your home based on specific rooms. This
allows you to prioritize comfort where you want it.
Selected Rooms
Rooms you manually select create an average
temperature in your home.
Unselected Room
Will not contribute to the average temperature.
Selected Room
Will contribute to the average temperature.
Active Rooms
Rooms with detected motion are automatically selected
to create an average temperature in your home.
Room without Activity
No motion is detected. Will not contribute to the average
temperature.
Room with Activity
Motion is detected. Will contribute to the average
temperature.