Thermostat Mounting; System Operation Settings; Fan Operation Settings - Honeywell T4 Pro Installation Instructions Manual
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Also See for T4 Pro:
- User manual (19 pages) ,
- Installation instructions manual (37 pages) ,
- Installation instructions manual (37 pages)
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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 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.
5
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Table of Contents
Need help?
Do you have a question about the T4 Pro and is the answer not in the manual?
Questions and answers
How to switch?
To switch settings on the Honeywell T4 Pro thermostat, use the Plus or Minus buttons to navigate through options and adjust values. Press the Select button to confirm choices. For temperature overrides, press the Plus or Minus buttons from the home screen to adjust the temperature. The thermostat will hold this setting until the next programmed time. The Hold button allows switching between temporary and permanent holds. To cancel all holds, press the Cancel button. To change fan settings, toggle between "Fan Auto" (runs only when heating or cooling is active) and "Fan On" (runs continuously) by pressing the corresponding button.
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@Mr. Anderson how to switch again?
WHY ARENT ALL WIRES USED
Not all wires are used in the Honeywell T4 Pro thermostat because different HVAC systems require different wiring configurations. The thermostat supports various system types, including single transformer, dual transformer, heat-only, and heat/cool systems. Some terminals may not be needed depending on the specific system setup. Additionally, the THP9045A1023 Wire Saver Module can be used to reduce the number of required wires by combining functions, such as controlling both the fan and compressor with a single wire.
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I **** working with a T4 thermostat on set up. It has number 340. I do not see this in the book. I see code 350 can you explain? this is a heat pump set up.
what does the little triangle with exclamacion mark in it mean?
The triangle with an exclamation mark on the Honeywell T4 Pro thermostat indicates a caution or alert message. To see the specific alert, press the "Menu" button until the alert screen appears, then press "Select" to view the message.
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How do you remove the unlock button and get to where you can change from heat to cooling?
The Honeywell T4 Pro thermostat does not have a physical "unlock button" to remove. To switch from heat to cooling, the thermostat must be unlocked if it is locked. Follow these steps:
1. From the locked home screen, press the center button.
2. Enter the passcode (default is 1234) using the Plus or Minus buttons and the Select button.
3. After entering the full passcode, press Select. The thermostat will unlock.
Then, to switch from heat to cooling:
1. Press and hold the buttons for about 3 seconds to access advanced settings.
2. Use the Plus or Minus buttons to navigate to "TEST."
3. Press Select.
4. Use the buttons to choose the mode: "Heat," "Cool," "Fan," or "Em" (emergency heat).
5. Press Select to activate the desired mode.
Use the Home button to exit.
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I need help in choosing the right Honeywell thermostat
I HAVE 1 HEAT AND 1 COOLSYSTEM INSTALLER ONLY CONNECTED THE R AND C WIRES NOTHING TO Y W OR G
For a Honeywell T4 Pro thermostat with a one heat and one cool system (1H/1C), connect the wires as follows:
- Y (Compressor contactor): Connect to the Y terminal.
- W (Heating relay): Connect to the W terminal.
- G (Fan relay): Connect to the G terminal.
Ensure that the R and Rc terminals are properly configured using the slider tab, depending on whether you have one or two R wires.
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