Honeywell Home T3 Pro User manual

Package Includes:
• T3 Pro Thermostat
• UWP™ Mounting System
• Decorative Cover Plate –
Small; Size 4.72” H X 5.9” W
(120 mm H X 150 mm W)
• Screws and Anchors
• 2 AA Batteries
• Thermostat Literature
T3 Pro
Thermostat
Installation Instructions
TH3110U2008,
TH3210U2004
Read before installing
Heat On
Menu
Fan Auto
Optional Cover Plate installation
NOTE: If Optional Cover Plate is not required, see “UWP
Mounting System installation” on next page.
Use the Optional Cover Plate when you need to cover
paint gaps from the old thermostat.
1. Before starting, turn the power off at the breaker box
or switch.
2. Mount the Cover Plate to the wall using any of the 6
screw holes. Insert and tighten the mounting screws
supplied with the Cover Plate. Do not overtighten. See
Figure 1. Make sure the Cover Plate is level.
3. Attach the UWP by hanging it on the top hook of the
Cover Plate and then snapping the bottom of the
UWP in place. See Figure 2.
4. If mounting to a wall with no existing wall anchors:
a. Position the Cover Plate on wall. Level and mark
hole positions. See Figure 1.
b. Drill holes at marked positions, and then lightly
tap supplied wall anchors into the wall using a
hammer.
•If your box contains red anchors, drill 7/32” (5.6 mm) holes.
•If your box contains yellow anchors, drill 3/16” (4.8 mm) holes.
•Use 2x supplied screws (#8 11/2” (38 mm) for red anchors and
#6 11/2” (38 mm) for yellow anchors).
2
1

2
Power options
Insert AA batteries for primary or backup
power.
UWP Mounting System installation
Use 3x supplied
screws (#8 11/2”
(38 mm) for red
anchors and #6
11/2” (38 mm) for
yellow anchors)
1. Before starting, turn the power off
at the breaker box or switch. Open
package to find the UWP. See Figure 1.
2. Position the UWP on wall. Level and
mark hole positions. See Figure 2.
Drill holes at marked positions, and
then lightly tap supplied wall anchors
into the wall using a hammer.
‒If your box contains red anchors,
drill 7/32” (5.6 mm) holes.
‒If your box contains yellow anchors,
drill 3/16” (4.8 mm) holes.
3. Pull the door open and insert the 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.
NOTE: If Optional Cover Plate is required,
see “Optional Cover Plate installation” on
previous page.
4
12
3
S
S
Y2
U
U
G
C
Y
A
Rc
W
K
W2
R
L/A
O/B
AUX
E
Insert Rand Cwires into
designated terminals for primary
AC power (C terminal is optional
if batteries are installed, but it is
recommended). Remove wires by
depressing the terminal tabs.

3
UWP Wiring terminal designations
SNot used for T3
thermostat.
L/A
- A Not used for T3 thermostat.
SO/B Changeover valve
YCompressor contactor
(stage 1)
AUX -
W2
Auxiliary heat
(TH3210U only)
Y2 Not used for T3
thermostat. EEmergency heat (TH3210U only)
GFan WHeat (stage 1)
C
24VAC common. For 2
transformer systems,
use common wire from
cooling transformer.
KNot used for T3 thermostat.
UNot used for T3
thermostat.
R24VAC power from heating
transformer*
URc 24VAC power from cooling
transformer*
Note: Not all
terminals may be
used, depending
on the system
type that is being
wired. The most
commonly used
terminals are
shaded.
* Terminal can be jumped using Slider Tab. See “Setting Slider Tabs” above.
Set R Slider Tab.
• 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, 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).
NOTE: Slider Tab for U terminals should be left
in place for T3 Pro models.
Setting Slider Tabs (built-in jumper)
R/Rc Slider Tab
(built-in jumper)
UWP Mounting System

4
1H/1C System (1 transformer)
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor
C 24VAC common [3]
W Heat
G Fan
Heat-only System
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
C 24VAC common [3]
W Heat
Heat-only System (Series 20) [5]
R Series 20 valve terminal “R” [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Series 20 valve terminal “W”
C 24VAC common [3]
W Series 20 valve terminal “B”
Heat-only System
(power open zone valve) [5]
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
W Valve
C 24VAC common [3]
1H/1C System (2 transformers)
R Power (heating transformer) [1]
Rc Power (cooling transformer) [1]
Y Compressor contactor
C 24VAC common [3, 4]
W Heat
G Fan
Heat-only System with Fan
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
C 24VAC common [3]
W Heat
G Fan
Cool-only System
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor
C 24VAC common [3]
G Fan
1H/1C Heat Pump System
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan
W Do not use this terminal for heat pump
applications!
2H/1C Heat Pump System (TH3210U only)
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan
AUX Auxiliary heat
E Emergency heat
W Do not use this terminal for heat pump
applications!
Wiring heat pump systems
Wiring conventional systems: forced air and hydronics
NOTES
Wire specifications: Use 18 to 22-gauge thermostat wire. Shielded cable is not required.
[1] Power supply. Provide disconnect means and overload
protection as required.
[2] Move RSlider Tab on UWP to the Rsetting. For more
information, see “Setting Slider Tabs (built-in jumper)” on
page 3
[3] Optional 24VAC common connection.
[4] Common connection must come from cooling transformer.
[5] In ISU set Heat system type to Radiant Heat. Set number of
cool stages to 0.
[7] In Installer Setup, set changeover valve to O (for cool
changeover) or B (for heat changeover).

5
Thermostat mounting
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.
4. Turn the power on at the breaker box or
switch.
System operation settings
1. Press Menu, and then press the Mode (+)
button to cycle to the next available
System mode.
2. Cycle through the modes until the required
System mode is displayed, and then press
Done.
NOTE: Available System modes vary by model
and system settings.
System modes:
‒Auto: Thermostat selects heating or cooling as needed.
‒Heat: Thermostat controls only the heating system.
‒Cool: Thermostat controls only the cooling system.
‒Em heat (TH3210U only): For heat pumps with auxiliary heat. Thermostat
controls auxiliary heat. Compressor is not used.
‒Off: Heating and cooling system is off. Fan will still operate if fan is set to
On.
NOTE: Heat On/Cool On may flash for 5 minutes due to compressor protection.
Fan operation settings
1. Press Menu, and then press the Fan (-)
button to cycle to the next available
Fan mode.
2. Cycle through the modes until the
required Fan mode is displayed, then
press Done.
NOTE: Available Fan modes vary with
system settings.
Fan modes:
‒Auto: Fan runs only when the
heating or cooling system is on.
‒On: Fan is always on.

6
Installer setup (ISU)
NOTE: The thermostat enters installer setup the first time it is powered up during
installation. To re-enter the System Setup from the Home Screen, press and hold
the Menu button for approximately 5 seconds.
1. Select System Setup options.
Press Edit (-) to change values or select from available options. Then press Next
(+) to save changes and advance to the next System Setup number.
See “System Setup options” on the next page for a full list of System Setup
numbers and options .
Repeat until all of the System Setup options have been set, and then press
Done. The thermostat will save and exit to the home screen.
2. Continue to “Installer setup (ISU)” on page 6.
Setup number Option number

7
Installer setup (ISU)
ISU Setup Number and Description Options (factory default in bold)
125 = Temperature Indication Scale 0 = Fahrenheit
1 = Celsius
200 = Heating System Type
1 = Conventional Forced Air Heat
2 = Heat Pump
3 = Radiant Heat
5 = None (Cool Only)
Notes:
• Default varies based on model.
• This option selects the basic system type your thermostat will
control.
205 = Heating Equipment Type
Conventional Forced Air Heat:
1 = Standard Efficiency Gas Forced Air
2 = High Efficiency Gas Forced Air
3 = Oil Forced Air
4 = Electric Forced Air
5 = Hot Water Fan Coil
Heat Pump:
Note: ISU 205 is not shown when ISU 200 is set for heat pump.
Radiant Heat:
9 = Hot Water Radiant Heat
12 = Steam
Note: This option selects the equipment type your thermostat will
control. This feature is NOT displayed if feature 200 is set to Cool Only.
218 = Reversing Valve O/B
0 = O (O/B in Cool)
1 = B (O/B in Heat)
Note: This option is only displayed if the Heat Pump is configured. Select
whether reversing valve O/B should energize in cool or in heat.
220 = Cool Stages / Compressor Stages
(200=Conv / 200=HP)
0, 1
Note: Select how many Cool or Compressor stages of your equipment
the thermostat will control. Set value to 0 if you do not have Cool Stage/
Compressor Stage.
221 = Heat Stages / Backup Heat Stages
Heat Stages: 1
Backup Heat Stages: 0, 1
Note: Select how many Heat or Aux/E stages of your equipment the
thermostat will control.
230 = Fan Control in Heat
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: This ISU is only displayed if ISU 205 is set to Electric Forced Air or
Fan Coil.
300 = System Changeover
0 = Manual
1 = Automatic
Note: Thermostat can automatically control both heating and cooling
to maintain the desired indoor temperature. To be able to select
“automatic” system mode on thermostat home screen, turn this feature
ON. Turn OFF if you want to control heating or cooling manually.
Continued on next page.

8
ISU Setup Number and Description Options (factory default in bold)
303 = Auto Changeover Differential
0 °F to 5 °F
0 °C to 2.5 °C
Note: Differential is NOT deadband. Differential means how far past the
setpoint before switching to the mode selected. Deadband setup is not
an option. An advanced algorithm fixes the deadband at 0 °F. This is
more advanced than previous thermostats.
340 = Backup Heat Droop
(TH3210U only)
0 = Comfort
2 = 2 °F
3 = 3 °F
4 = 4 °F
5 = 5 °F
6 = 6 °F
7 = 7 °F
8 = 8 °F
9 = 9 °F
10 = 10 °F
11 = 11 °F
12 = 12 °F
13 = 13 °F
14 = 14 °F
15 = 15 °F
350 = Upstage Timer to Backup Heat
(TH3210U only)
0 = Off
1 = 30 minutes
2 = 45 minutes
3 = 60 minutes
4 = 75 minutes
5 = 90 minutes
6 = 2 hours
7 = 3 hours
8 = 4 hours
10 = 5 hours
365 = Compressor Cycle Rate (Stage 1)
1 - 6
Note: This ISU is only displayed when Cool /Compressor Stage is set to
1 stage. Cycle rate limits the maximum number of times the system can
cycle in a 1 hour period measured at a 50% load. For example, when
set to 3 CPH, at a 50% load, the most the system will cycle is 3 times
per hour (10 minutes on, 10 minutes off). The system cycles less often
when load conditions are less than or greater than a 50% load.
370 = Heating Cycle Rate (Stage 1)
1 - 12
Note: This ISU is only displayed when Heat Stage is set to 1 stage. Cycle
rate limits the maximum number of times the system can cycle in a 1
hour period measured at a 50% load. For example, when set to 3 CPH,
at a 50% load, the most the system will cycle is 3 times per hour (10
minutes on, 10 minutes off). The system cycles less often when load
conditions are less than or greater than a 50% load. The recommended
(default) cycle rate settings are below for each heating equipment type:
Standard Efficiency Gas Forced Air = 5 CPH; High Efficiency Gas Forced
Air = 3 CPH; Oil Forced Air = 5 CPH; Electric Forced Air = 9 CPH; Fan Coil
= 3 CPH; Hot Water Radiant Heat = 3 CPH; Steam = 1 CPH.
375 = Heating Cycle Rate Auxiliary Heat
(TH3210U only) 1 - 12
387 = Compressor Protection
0 = Off
1 - 5minutes
Note: The thermostat has a 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
shows “Wait” in the display. This ISU is displayed if ISU 220 is set to at
least 1 stage.
Installer setup (ISU) (continued)

9
ISU Setup Number and Description Options (factory default in bold)
430 = Minimum Cool Setpoint
50 °F to 99 °F (50 °F)
10.0 °C to 37.0 °C (10.0 °C)
Note: The cool temperature cannot be set below this level.
431 = Maximum Heat Setpoint
32 °F to 90 °F (90 °F)
0 °C to 32.0 °C (32 °C)
Note: The heat temperature cannot be set above this level.
1400 = Backlighting
0 = On Demand
1 = Continuous
Note: Common wire needed for continuous.
1401 = Backlight Brightness 1 - 5
Note: Only displayed if continuous backlight selected.
1420 = Temperature Display Offset
3 °F to 3 °F (0 °F)
1.5 °C to 1.5 °C (0 °C)
Note: 0 °F = No difference in displayed temperature and the actual room
temperature. The thermostat can display up to 3 °F (1.5 °C) lower or
higher than the actual measured temperature.
NOTE: Once you have cycled through all of the System Setup numbers, press
Done to save and exit to the home screen.
Setup Complete
You have now finished installing and setting up your thermostat.
Installer setup (ISU) (continued)

10
Specifications
Temperature Ranges
Heat: 32 °F to 90 °F (0 °C to 32.0 °C)
Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
Operating Ambient Temperature
32 °F to 102 °F (0 °C to 38.9 °C)
Shipping Temperature
20 °F to 120 °F (28.9 °C to 48.9 °C)
Operating Relative Humidity
5% to 90% (non-condensing)
Physical Dimensions in inches (mm) (H x W x D)
Thermostat: 3.86” H x 5.36” W x 1.08” D
(98 mm H x 136 mm W x 27.4 mm D)
Decorative Cover Plate – Small; size:
4.72” H X 5.9” W (120 mm H X 150 mm W)
Electrical Ratings
Terminal Voltage (50Hz/60Hz) Running Current
WHeating 20 Vac30 Vac 0.02 A1.0 A
W2 (Aux) Heating (TH3210U only) 20 Vac30 Vac 0.02 A1.0 A
EEmergency Heat (TH3210U only) 20 Vac30 Vac 0.02 A0.5 A
YCompressor Stage 1 20 Vac30 Vac 0.02 A1.0 A
GFan 20 Vac30 Vac 0.02 A0.5 A
O/B Changeover 20 Vac30 Vac 0.02 A0.5 A
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be
corrected quickly and easily.
Display is blank • Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly installed (see page 2).
Heating or cooling
system does not
respond
• Press Mode button to set system Heat (see page 5). Make sure the desired
temperature is set higher than the inside temperature.
• Press Mode button to set system Cool (see page 5). Make sure the desired
temperature is set lower than the inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.
“Cool On” or
“Heat On” is
flashing
• Compressor protection feature is engaged. Wait 5 minutes for the system to
restart safely, without damage to the compressor.
Aux heat runs in
cooling
• For heat pump systems, verify there is not a wire attached to W on UWP systems.
See “Wiring heat pump systems” on page 4.
Cool runs with a
call for heat
• For heat pump systems, verify there is not a wire attached to W on UWP systems.
See “Wiring heat pump systems” on page 4.