Honeywell Programmable Thermostat T4 Pro Installation Guide

Honeywell Programmable Thermostat T4 Pro

Package Includes:

• T4 Pro Thermostat
• UWP™ Mounting System
• Decorative Cover Plate
• Screws and Anchors
• 2 AA Batteries
• Thermostat Literature

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 gap from old thermostat.
There are different cover plates depending on when the thermostat was manufactured.

For the square cover plate:

1. Separate the Cover Plate from Mounting Plate.
2. Mount the Mounting Plate on to the wall using any of the 8 screw holes.
   Insert and tighten mounting screws supplied with Cover Plate Kit. Do not overtighten. See Figure 2. Make sure the Mounting Plate is level.
3. Attach the UWP by hanging it on the top hook of the Mounting Plate and then snapping the bottom of the UWP in place. See Figure 3.
4. Snap the Cover Plate onto the Mounting Plate. See Figure 4.

For the rectangular cover plate:

1. Mount the Cover Plate on 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. 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.
2. If there are no existing wall anchors:
   1. Position the Cover Plate on wall. Level and mark hole positions. See Figure 1.
   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.
      • 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 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” holes.
   • If your box contains yellow anchors, drill 3/16” 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.

 

Power options

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 T4 Pro models.

UWP Wiring terminal designations

Terminal can be jumped using Slider Tab. See “Setting Slider Tabs” above.
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.

Note: Not all terminals may be used, depending on the system type that is being wired. The most commonly used terminals are shaded.

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

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

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 (TH4210U 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” 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.
6. In Installer Setup, set changeover valve to O (for cool changeover) or B (for heat changeover).

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 the Mode button to cycle to the next available System mode.
2. 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: Thermostat selects heating or cooling as needed.
   • Heat: Thermostat controls only the heating system.
   • Cool: Thermostat controls only the cooling system.
   • Em Heat (TH4210U only) (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.

Fan operation settings

1. Press the Fan button to cycle to the next available Fan mode.
2. 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.

Installer setup (ISU)

1. Press and hold CENTER and buttons for approximately 3 seconds to enter advanced menu.
2. Press Select to enter ISU.
3. Press Select to cycle through menu setup options.
4. Press or to change values or select from available options.
5. Press Select and confirm your settings or press Back to ignore changes and return to ISU menu screen to continue editing another setup option.
6. 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.

Advanced setup options (ISU)

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

Installer system test
To perform a System Test:

1. Press and hold CENTER and buttons for approximately 3 seconds to enter advanced menu.
2. Use to go to TEST. Press Select to enter System Test.
3. Use to change between Heat, Cool, Fan, Em. Heat (TH4210U only), or Ver (thermostat version information). Press Select.
4. Press to turn heat, cool, or fan on. Press to turn them off.
5. 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)

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

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.

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.

Temperature settings do not change
Make sure heating and cooling temperatures are set to acceptable 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)

“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”.

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”.

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.resideo.com
Or call Customer Care toll-free at 1-800-468-1502.

Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
33-00187EFS—15 M.S. Rev. 04-20 | Printed in United States

www.resideo.com

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The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates.