Honeywell T3 Pro Series Thermostats Installation Guide

T3 Pro Series Thermostats

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Product Information

Specifications:

• Model: T3 Pro Thermostat
• Models: TH3110U2008, TH3210U2004
• Power Options: AC Power or AA Batteries
• Mounting System: UWP Mounting System
• Optional Cover Plate: Available

Product Usage Instructions

Optional Cover Plate Installation:

1. Turn off power at the breaker box.

2. Mount the Cover Plate to the wall using the provided screws.
   Ensure it is level.

3. Attach the UWP to the Cover Plate by hanging it on the top hook
   and snapping the bottom in place.

4. If mounting to a wall without anchors, drill holes, insert wall
   anchors, and secure the Cover Plate.

UWP Mounting System Installation:

1. Turn off power at the breaker box.

2. Position the UWP on the wall, mark hole positions, and install
   wall anchors.

3. Insert wires through the wiring hole of the UWP.

4. Secure the UWP over the wall anchors using the provided
   screws.

Power Options:

• Insert R and C wires into designated terminals for primary AC
  power. C terminal is optional if batteries are used.

• Insert AA batteries for primary or backup power.

Setting Slider Tabs:

Ensure correct settings for one or two transformer systems. For
T3 Pro models, leave the U terminals slider tab in place.

UWP Wiring Terminal Designations:

• S – Not used for T3 thermostat.
• Y – Compressor contactor (stage 1).
• G – Fan.
• C – 24VAC common.
• R – 24VAC power from heating transformer.
• Rc – 24VAC power from cooling transformer.

Frequently Asked Questions (FAQ)

Q: Do I need to use the Optional Cover Plate?

A: The Optional Cover Plate is used to cover paint gaps from old
thermostats. If not required, you can proceed with UWP Mounting
System installation directly.

Q: Can I use batteries instead of AC power?

A: Yes, you can use AA batteries for primary or backup power.
However, it is recommended to use AC power for the main supply.

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T3 Pro
Thermostat
Installation Instructions
Package Includes: · T3 Pro Thermostat · UWPTM 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

Heat On Menu
Fan Auto
TH3110U2008, TH3210U2004 Read before installing

Optional Cover Plate installation

NOTE: If Optional Cover Plate is not required, see “UWP

1

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 2 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).

UWP Mounting System installation

1. Before starting, turn the power off

1

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.

3

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.

2
4
Use 3x supplied screws (#8 1-1/2″
(38 mm) for red anchors and #6 1-1/2″ (38 mm) for yellow anchors)

Power options

S

L/A A

S

O/B

Y

AUX W2

Y2

E

G

W

C

K

U

R

U

Rc

Insert R and C wires 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.

Insert AA batteries for primary or backup power.

2

Setting Slider Tabs (built-in jumper)
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.

UWP Mounting System

R/Rc Slider Tab (built-in jumper)

UWP Wiring terminal designations

S

Not used for T3

thermostat.

S

Y

Compressor contactor (stage 1)

Y2

Not used for T3 thermostat.

G Fan

24VAC common. For 2

C

transformer systems, use common wire from

cooling transformer.

U Not used for T3 thermostat.
U

L/A – A

Not used for T3 thermostat.

O/B

Changeover valve

AUX – Auxiliary heat

W2

(TH3210U only)

E

Emergency heat (TH3210U only)

W

Heat (stage 1)

K

Not used for T3 thermostat.

R

24VAC power from heating transformer*

Rc

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.

3

Wiring conventional systems: forced air and hydronics

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

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 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]

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

Wiring heat pump systems

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!

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 R setting. 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).

4

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.
5

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

6

Installer setup (ISU)

ISU Setup Number and Description 125 = Temperature Indication Scale 200 = Heating System Type
205 = Heating Equipment Type
218 = Reversing Valve O/B 220 = Cool Stages / Compressor Stages (200=Conv / 200=HP) 221 = Heat Stages / Backup Heat Stages 230 = Fan Control in Heat 300 = System Changeover

Options (factory default in bold)
0 = Fahrenheit 1 = Celsius
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.
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.
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.
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.
Heat Stages: 1 Backup Heat Stages: 0, 1
Note: Select how many Heat or Aux/E stages of your equipment the thermostat will control.
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.
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.

7

Installer setup (ISU) (continued)

ISU Setup Number and Description 303 = Auto Changeover Differential
340 = Backup Heat Droop (TH3210U only)
350 = Upstage Timer to Backup Heat (TH3210U only)
365 = Compressor Cycle Rate (Stage 1)
370 = Heating Cycle Rate (Stage 1)
375 = Heating Cycle Rate Auxiliary Heat (TH3210U only) 387 = Compressor Protection

Options (factory default in bold)

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.

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

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

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.

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.

1 – 12

0 = Off 1 – 5 minutes
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.

8

Installer setup (ISU) (continued)

ISU Setup Number and Description 430 = Minimum Cool Setpoint 431 = Maximum Heat Setpoint 1400 = Backlighting 1401 = Backlight Brightness 1420 = Temperature Display Offset

Options (factory default in bold)
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.
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.
0 = On Demand 1 = Continuous
Note: Common wire needed for continuous.
1 – 5
Note: Only displayed if continuous backlight selected.
-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.

9

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)
Electrical Ratings
Terminal W Heating (Powerpile) W2 (Aux) Heating (TH3210U only) E Emergency Heat (TH3210U only) Y Compressor Stage 1 G Fan O/B Changeover

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)

Voltage (50Hz/60Hz) 20 Vac-30 Vac 750 mV DC 20 Vac-30 Vac 20 Vac-30 Vac 20 Vac-30 Vac 20 Vac-30 Vac 20 Vac-30 Vac

Running Current 0.02 A-1.0 A 100 mA DC 0.02 A-1.0 A 0.02 A-0.5 A 0.02 A-1.0 A 0.02 A-0.5 A 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 · For heat pump systems, verify there is not a wire attached to W on UWP systems.

cooling

See “Wiring heat pump systems” on page 4.

Cool runs with a · For heat pump systems, verify there is not a wire attached to W on UWP systems.

call for heat

See “Wiring heat pump systems” on page 4.

10

CAUTION: ELECTRICAL HAZARD Can cause electrical shock or equipment damage. Disconnect power before beginning installation. CAUTION: EQUIPMENT DAMAGE HAZARD Compressor protection is bypassed during testing. To prevent equipment damage, avoid cycling the compressor quickly. CAUTION: MERCURY NOTICE If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal. CAUTION: ELECTRONIC WASTE NOTICE The product should not be disposed of with other household waste. Check for the nearest authorized collection centers or authorized recyclers. The correct disposal of end-of-life equipment will help prevent negative consequences for the environment and human health.
Customer assistance
For assistance with this product, please visit customer.resideo.com. Or call Customer Care toll-free at 1-800-468-1502.
Pull to remove the thermostat from the UWP.
11

www.resideo.com

Resideo Technologies Inc. 1985 Douglas Drive North, Golden Valley, MN 55422 1-800-468-1502 33-00520EFS–05 M.S. Rev. 10-22 | Printed in United States

© 2022 Resideo Technologies, Inc. All rights reserved. The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates. Tous droits réservés. La marque de commerce Honeywell Home est utilisée avec l’autorisation d’Honeywell International, Inc. Ce produit est fabriqué par Resideo Technologies, Inc. et ses sociétés affiliées. Todos los derechos reservados. La marca comercial Honeywell Home se utiliza bajo licencia de Honeywell International, Inc. Este producto es fabricado por Resideo Technologies, Inc. y sus afiliados.

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References

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