Honeywell T4 Pro Programmable Thermostat User Manual

Honeywell T4 Pro Programmable Thermostat

Package Includes:

• T4 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 the Optional Cover Plate is not required, see “UWP Mounting System installation” on the next page. Use the Optional Cover Plate when:

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

1. Before starting, turn the power off at the breaker box or switch. Separate the Junction Box Adapter from the Cover Plate. See Figure 1.
2. 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.
3. 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.
4. Snap the Cover Plate onto the Junction Box Adapter. See Figure 4.

UWP Mounting System installation

1. Before starting, turn the power off at the breaker box or switch. Open the package to find the UWP. See Figure 5.
2. Position the UWP on the 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.
3. Pull the door open and insert the wires through the wiring hole of the UWP. See Figure 7.
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 8.

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 (built-in jumper)

Set R Slider Tab.

• Use the 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

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 the 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

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 the 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

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 relay

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 relay
• AUX Auxiliary heat
• E Emergency heat relay
• L Heat pump fault input

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 the 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] A common connection must come from the cooling transformer.
• [5] In ISU, set the Heat system type to Radiant Heat. Set the number of cool stages to 0.
• [7] In Installer Setup, set the changeover valve to O (for cool changeover) or B (for heat changeover).

Thermostat mounting

1. Push the 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: The Thermostat controls only the cooling system.
   • Em Heat (TH4210U only) (only for heat pumps with auxiliary heat): Thermostat controls Auxiliary Heat. The compressor is not used.
   • Off: The Heating and cooling system is off. The fan will still operate if the fan is set to On or Circulate.

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 the CENTER and + buttons for approximately 3 seconds to enter the 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 the ISU menu screen to continue editing another setup option.
6. To finish the setup process and save your settings, press Home and return to the Home screen.
   NOTE: A complete list of all setup (ISU) parameters and options starts below and continues through page 10.

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 the CENTER and + buttons for approximately 3 seconds to enter the advanced menu.
2. Use + to go to TEST. Press Select to enter System Test.
3. Use + to change between Heat, Cool, Fan, and Em. Heat (TH4210U only), or Ver (thermostat version information). Press Select.
4. Press + to turn the 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

• 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.

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Honeywell T4 Pro Programmable Thermostat-FAQs