Uwp Wiring Terminal Designations; Setting Slider Tabs (Built-In Jumper) - 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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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 Tabs for U terminals should be
left in place for T4 Pro models.
UWP Wiring terminal designations
S
Not used for T4
thermostat.
S
Compressor contactor
Y
(stage 1)
Not used for T4
Y2
thermostat.
G
Fan Relay
24VAC common. For 2
transformer systems,
C
use common wire from
cooling transformer.
U
Not used for T4
thermostat.
U
* 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.
L/A
Heat Pump fault input (most
- A
common case)
O/B
Changeover valve
AUX -
Auxiliary heat (TH4210 only)
W2
Emergency heat (TH4210
E
only)
W
Heat relay (stage 1)
Connect to K on Wire Saver
K
Module**
24VAC power from heating
R
transformer*
24VAC power from cooling
Rc
transformer*
3
UWP Mounting System
R/Rc Slider Tab
(built-in jumper)
Note: Not all
terminals may be
used, depending
on the system
type that is being
wired. The most
commonly used
terminals are
shaded.
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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.
This answer is automatically generated