Honeywell T6 Pro Programmable Thermostat Instruction Manual

: June 10, 2024
: Honeywell

Table of Contents

Honeywell T6 Pro Programmable Thermostat
Product Information
Product Usage Instructions
Package Includes
Optional Cover Plate installation
Power options
Setting Slider Tabs
Wiring terminal designations
Wiring conventional systems: forced air and hydronics
Wiring heat pump systems
Thermostat mounting
operation settings
Installer setup (ISU)
Advanced setup options (ISU)
Installer system test
Specifications
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Honeywell T6 Pro Programmable Thermostat

Honeywell-T6-Pro-Programmable-Thermostat-product

T6 Pro Programmable Thermostat – Installation Instructions

Product Information

The T6 Pro Programmable Thermostat is a versatile and easy-to-use device that allows you to control the temperature in your home or office. It is designed to work with most HVAC systems, including forced air and hydronic systems, and can be powered by either primary AC power or AA batteries for backup power.

The thermostat features a UWP Mounting System that allows for easy installation on any wall, as well as a Junction Box Adapter for optional cover plate installation. The device also includes a range of wiring terminal designations that can be used to connect with different types of HVAC systems.

Product Usage Instructions

Optional Cover Plate Installation

If you want to install the optional cover plate, follow these steps:

Separate the Junction Box Adapter from the Cover Plate.
Mount the Junction Box Adapter to the wall or electrical box using any of the eight screw holes. Make sure the Adapter Plate is level.
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.
Snap the Cover Plate onto the Junction Box Adapter.

UWP Mounting System Installation

If you want to use the UWP Mounting System for installation, follow these steps:

Before starting, turn off the power at the breaker box or switch.
Position the UWP on the wall and level it. Mark hole positions and drill holes at marked positions, then lightly tap supplied wall anchors into the wall using a hammer.
Pull the door open and insert the wires through the wiring hole of the UWP.
Place the UWP over the wall anchors and insert and tighten mounting screws supplied with the UWP. Close the door.

Power Options

The thermostat can be powered by either primary AC power or AA batteries for backup power. You can insert R and C wires into designated terminals for primary AC power, and insert AA batteries for primary or backup power.

Setting Slider Tabs

The UWP Mounting System includes a slider tab that can be used to jump the R and Rc terminals. This is useful for systems that only have one transformer. You can also 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.

Wiring Conventional Systems: Forced Air and Hydronics

The thermostat includes a range of wiring terminal designations that can be used to connect with different types of HVAC systems. For a 1H/1C system with one transformer, the wiring should be as follows:

R – Power (connect to transformer)
Rc – Power (connect to cooling transformer)
Y – Compressor contactor
C – 24VAC common
W – Heat relay
G – Fan relay

Package Includes

T6 Pro Thermostat
UWP Mounting System
Honeywell Standard Installation Adapter (J-box adapter)
Honeywell Decorative Cover Plate – Small; size 4-49/64 in x 4-49/64 in x 11/32 in (121 mm x 121 mm x 9 mm)
Screws and anchors
2 AA Batteries
Installation Instructions and User Guide

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:

Mounting the thermostat to an electrical junction box
Or when you need to cover paint gap from old thermostat.

Separate the Junction Box Adapter from the Cover Plate. See Figure 1.
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. See Figure 2. Make sure the Adapter Plate is level.
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 3.
Snap the Cover Plate onto the Junction Box Adapter. See Figure 4.
Before starting, turn the power off at the breaker box or switch. Open package to find the UWP. See Figure 5.
Position the UWP on wall. Level and mark hole positions. See Figure 6. Drill holes at marked positions, and then lightly tap supplied wall anchors into the wall using a hammer.
- Drill 7/32” holes for drywall.
Pull the door open and insert the wires through wiring hole of the UWP. See Figure 7.
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 8.

Power options

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.

Setting Slider Tabs

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 Tabs for U terminals should be left in place for T6 Pro models. Honeywell-T6-Pro-Programmable-Thermostat-fig 5

Wiring terminal designations

S

|

Universal input for wired indoor or outdoor sensors

---|---
S

Y

|

Compressor contactor (stage 1)

Y2| Compressor contactor (stage 2)
G| Fan Relay

C

| 24VAC common. For 2 transformer systems, use common wire from cooling transformer.
U|

Unused

U

L/A

– A

|

Heat Pump fault input (most common case)

---|---
O/B| Changeover valve

AUX – W2

| Auxiliary heat relay Heat relay (stage 2)
E| Emergency Heat relay
W| Heat relay (stage 1)

K

|

Connect to K on Wire Saver Module**

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.
The THP9045A1023 Wire Saver Module 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.

Wiring conventional systems: forced air and hydronics

Shaded areas below apply only to TH6320U/TH6220U or as otherwise noted.

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 relay
G Fan relay

Heat-only System

R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
C 24VAC common [3]
W Heat relay

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 relay
G Fan relay

Heat-only System with Fan

R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
C 24VAC common [3]
W Heat relay
G Fan relay

Cool-only System

R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor
C 24VAC common [3]
G Fan relay

2H/2C System (1 transformer) [6]

R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor (stage 1)
C 24VAC common [3]
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)

NOTES
Wire specifications: Use 18- to 22-gauge thermostat wire. Shielded cable is not required.

Power supply. Provide disconnect means and overload protection as required.
Move R-Slider Tab on UWP to the R setting. For more information, see “Setting Slider Tabs” on page 3
Optional 24VAC common connection.
Common connection must come from cooling transformer.
In ISU set Heat system type to Radiant Heat. Set number of cool stages to 0.
In Installer Setup, set system type to 2Heat/2Cool Conventional.

Wiring heat pump systems

Shaded areas below apply only to TH6320U/TH6220U or as otherwise noted.

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 relay

2H/1C Heat Pump System [8]

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 relay
Aux Auxiliary heat
E Emergency heat relay
L Heat pump fault input

2H/2C Heat Pump System [9]

R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Y2 Compressor contactor (stage 2)
L Heat pump fault input

3H/2C Heat Pump System (TH6320U only) [10]

R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux Auxiliary heat
E Emergency heat relay
Y2 Compressor contactor (stage 2)
L Heat pump fault input

Dual Fuel System

R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux Auxiliary heat
E Emergency heat relay
Y2 Compressor contactor (stage 2 – if needed)
L Heat pump fault input
S Outdoor sensor
S Outdoor sensor

NOTES
Wire specifications: Use 18- to 22-gauge thermostat wire. Shielded cable is not required.

Power supply. Provide disconnect means and overload protection as required.
Move R-Slider Tab on UWP to the R setting. For more information, see “Setting Slider Tabs” on page 3
Optional 24VAC common connection.
In Installer Setup, set system type to 2Heat/2Cool Conventional.
In Installer Setup, set changeover valve to O (for cool changeover) or B (for heat changeover).
In ISU set Heat system type to Heat pump. 1 compressor and 1 stage of backup heat.
In ISU set Heat system type to Heat pump. 2 compressors and 0 stage of backup heat.
In ISU set Heat system type to Heat pump. 2 compressors and 1 stage of backup heat.

Thermostat mounting

Push excess wire back into the wall opening.
Close the UWP door. It should remain closed without bulging.
Align the UWP with the thermostat, and push gently until the thermostat snaps in place.
Turn the power on at the breaker box or switch.

operation settings

System operation settings

Press the Mode button to cycle to the next available System mode.
Cycle through the modes until the required System mode is displayed and leave it to activate.

NOTE: Available System modes vary by model and system settings.

System modes:

Auto
Heat
Cool
Em Heat
Off

Fan operation settings

Press the Fan button to cycle to the next available Fan mode.
Cycle through the modes until the required Fan mode is displayed and leave it to activate.

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.
Circ: Fan runs randomly about 33% of the time.

Installer setup (ISU)

Press and hold CENTER and buttons for approximately 3 seconds to enter advanced menu.
Press Select to enter ISU.
Press Select to cycle through menu setup options.
Press or to change values or select from available options.
Press Select and confirm your settings or press Back to ignore changes and return to ISU menu screen to continue editing another setup option.
To finish setup process and save your setting, press Home and return to Home screen.

NOTE: A complete list of all setup (ISU) parameters and options starts below and continues through page 10. Honeywell-T6-Pro-Programmable-
Thermostat-fig 12

Advanced setup options (ISU)

NOTE: Depending on system settings, not all options may be available.

# ISU	ISU Name	ISU Options (factory default in bold)
120	Scheduling Options	0 = Non-Programmable

2 = 5-2 Programmable

3 = 5-1-1 Programmable

4 = 7-Day Programmable

125| Temperature Indication Scale| 0 = Fahrenheit

1 = Celsius

130| Outdoor Sensor

(TH6320 / TH6220 only)

| 0 = None

1 = Wired Outdoor Sensor

200| Heating System Type| 1 = Conventional Forced Air Heat

2 = Heat Pump 3 = Radiant Heat

5 = None (Cool Only)

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:

7 = Air to Air Heat Pump

8 = Geothermal Heat Pump

Radiant Heat:

9 = Hot Water Radiant Heat

12 = Steam

218| Reversing Valve O/B| 0 = O (O/B in Cool)

1 = B (O/B in Heat)

220| Cool Stages / Compressor Stages 200=Conv / 200=HP

(TH6320 / TH6220 only*)

| 0, 1 , 2*
# ISU| ISU Name| ISU Options (factory default in bold)
---|---|---
221| Heat Stages / Backup Heat Stages| Heat Stages: 1 , 2

Backup Heat Stages: 0, 1

230| Fan Control in Heat| 1 = Equipment Controls Fan

2 = Thermostat Controls Fan

253| Aux/E terminal control (TH6320 only)| 0 = Drive both Aux & E together

1 = Aux and E independent

255| Backup Heat Source (Heat Pump Only)| 1 = Electric Forced Air

2 = Gas/Oil Forced Air (or Fossil Forced Air)

256| Emergency Heat Source (TH6320 only)| 1 = Electric Forced Air

2 = Gas/Oil Forced Air (or Fossil Forced Air)

260| External Fossil Fuel Kit

(TH6320 / TH6220 only)

| 0 = Thermostat Controls Backup Heat

1 = External Fossil Fuel Kit Controls Backup Heat

270| Backup Heat Fan| 1 = Equipment Controls Fan

2 = Thermostat Controls Fan

Note: Setting only active with TH6320 in Heat Pump mode.

271| Emergency Heat Fan| 1 = Equipment Controls Fan

2 = Thermostat Controls Fan

Note: Setting only active with TH6320 in Heat Pump mode.

300| System Changeover| 0 = Manual

1 = Automatic

303| Auto Changeover Differential| 0 °F to 5 °F

0.0 °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.

Honeywell uses an advanced algorithm that fixes deadband at 0 °F. This is more advanced than previous thermostats.

340| Backup Heat Droop| 0 = Comfort 9 = 9 °F

2 = 2 °F 10 = 10 °F

3 = 3 °F 11 = 11 °F

4 = 4 °F 12 = 12 °F

5 = 5 °F 13 = 13 °F

6 = 6 °F 14 = 14 °F

7 = 7 °F 15 = 15 °F

8 = 8 °F

350| Upstage Timer for Backup Heat| 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

355| Compressor Lockout / Balance Point| — = Off

5 °F to 60 °F (in 5 °F increments)

-15.0 °C to 15.5 °C (in 2.5 °C or 3.0 °C increments)

Note: Use a wired sensor to set compressor lockout / balance point on TH6320

/ TH6220.

356| Outdoor Lockout Backup Heat| — = Off

5 °F to 65 °F (in 5 °F increments)

-15.0 °C to 18.5 °C (in 2.5 °C or 3.0 °C increments)

365| Compressor Cycle Rate (Stage 1)| 1 – 6
366| Compressor Cycle Rate (Stage 1)| 1 – 6
370| Heating Cycle Rate (Stage 1)| 1 – 12
371| Heating Cycle Rate (Stage 2)| 1 – 12
# ISU| ISU Name| ISU Options (factory default in bold)
---|---|---
375| Heating Cycle Rate Auxiliary Heat| 1 – 12
378| Heating Cycle Rate Emergency Heat (TH6320 only)| 1 – 12
387| Compressor Protection| 0 = Off

1 – 5 minutes

425| Adaptive Intelligent Recovery| 0 = No

1 = Yes

Note: Adaptive Intelligent Recovery (AIR) is a comfort setting. Heating or cooling equipment will turn on earlier, ensuring the indoor temperature will match the setpoint at the scheduled time.

430| Minimum Cool Setpoint| 50 °F to 99 °F (50 °F)

10.0 °C to 37.0 °C (10.0 °C)

431| Maximum Heat Setpoint| 40 °F to 90 °F (90 °F)

4.5 °C to 32.0 °C (32.2 °C)

435| Keypad Lockout| 0 = None

1 = Partial

2 = Full

500| Is Indoor Temperature Sensor WIRED to your system? (TH6320 / TH6220 only)| 0 = No

1 = Yes

515| Indoor Sensor type

(TH6320 / TH6220 only)

| 0 = 10k

1 = 20k

520| Which Sensors will be used for TEMPERATURE Control? (Multiple Sensors are Averaged) (TH6320 / TH6220 only)| 1 = Thermostat Only 2 = Wired Only

3 = Average

702| Number of Air Filters| 0 – 2
711| Air Filter 1 Replacement Reminder| 0 = Off 10 = 45 Calendar Days

1 = 10 Run Time Days 11 = 60 Calendar Days

2 = 20 Run Time Days 12 = 75 Calendar Days

3 = 30 Run Time Days 13 = 3 Calendar Months

4 = 45 Run Time Days 14 = 4 Calendar Months

5 = 60 Run Time Days 15 = 5 Calendar Months

6 = 90 Run Time Days 16 = 6 Calendar Months

7 = 120 Run Time Days 17 = 9 Calendar Months

8 = 150 Run Time Days 18 = 12 Calendar Months

9 = 30 Calendar Days 19 = 15 Calendar Months

712| Air Filter 2 Replacement Reminder| 0 = Off 10 = 45 Calendar Days

1 = 10 Run Time Days 11 = 60 Calendar Days

2 = 20 Run Time Days 12 = 75 Calendar Days

3 = 30 Run Time Days 13 = 3 Calendar Months

4 = 45 Run Time Days 14 = 4 Calendar Months

5 = 60 Run Time Days 15 = 5 Calendar Months

6= 90 Run Time Days 16 = 6 Calendar Months

7 = 120 Run Time Days 17 = 9 Calendar Months

8 = 150 Run Time Days 18 = 12 Calendar Months

9 = 30 Calendar Days 19 = 15 Calendar Months

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.

1410| Clock Format| 12 / 24
1415| Daylight Saving Time| 0 = Off

1 = On

1420| Temperature Display Offset| -3 to 3F (0)

-1.5 to 1.5C (0)

Installer system test

To perform a System Test:

Press and hold CENTER and buttons for approximately 3 seconds to enter advanced menu.
Use to go to TEST. Press Select to enter System Test.
Use to change between Heat, Cool, Fan, Em Heat, or Ver (thermostat version information). Press Select.
Press to turn stages on one at a time, and press to turn them off.
Use the Home button to exit the System Test

Specifications

Temperature Ranges
- Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C)
- Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
Working Ambient Temperature
- 32 °F to 120 °F (0 C° to 48.9 °C)
Operating Ambient Temperature
- 37 °F to 102 °F (2.8 °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)
- 4-1/16” H x 4-1/16” W x 1-5/32” D
- 103.5 mm H x 103.5 mm W x 29 mm D

Electrical Ratings

Terminal	Voltage (50/60Hz)	Running Current
W Heating	20-30 Vac	0.02-1.0 A
(Powerpile)	750 mV DC	100 mA DC
W2 (Aux) Heating	20-30 Vac	0.02-1.0 A
E Emergency Heat	20-30 Vac	0.02-0.5 A
Y Compressor Stage 1	20-30 Vac	0.02-1.0 A
Y2 Compressor Stage 2	20-30 Vac	0.02-1.0 A
G Fan	20-30 Vac	0.02-0.5 A
O/B Changeover	20-30 Vac	0.02-0.5 A
L/A Input	20-30 Vac	0.02-0.5 A

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.

Customer assistance

For assistance with this product, please visit customer.honeywell.com.
Or call Honeywell Customer Care toll-free at 1-800-468-1502.
Pull to remove the thermostat from the UWP.

Automation and Control Solutions

Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com