Honeywell TH4210U2002 User manual

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
T4 Pro
Programmable Thermostat
Installation Instructions
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.
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.
Use 2x
supplied
screws #6
5/8”
4
3
2
1

2
Power options
Insert AA batteries for primary or backup
power.
UWP Mounting System installation
Use 3x supplied
screws #8 11/2”
1. Before starting, turn the power off
at the breaker box or switch. Open
package to find the UWP. See Figure 5.
2. 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.
3. Pull the door open and insert the wires
through 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.
8
5
6
7
S
S
Y2
U
U
G
C
Y
A
Rc
W
K
W2
R
L/A
O/B
AUX
E
Insert Rand Cwires 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.

3
UWP Wiring terminal designations
SNot used for T4
thermostat.
L/A
- A Not used for T4 thermostat.
SO/B Changeover valve
YCompressor contactor
(stage 1)
AUX -
W2
Auxiliary heat (TH4210U
only)
Y2 Not used for T4
thermostat. EEmergency heat (TH4210U only)
GFan Relay WHeat relay (stage 1)
C
24VAC common. For 2
transformer systems,
use common wire from
cooling transformer.
KConnect to K on Wire Saver
Module**
UNot used for T4
thermostat.
R24VAC power from heating
transformer*
URc 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.
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.
Setting Slider Tabs (built-in jumper)
R/Rc Slider Tab
(built-in jumper)
UWP Mounting System

4
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
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
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 relay
AUX Auxiliary heat
E Emergency heat relay
L Heat pump fault input
W Do not use this terminal for heat pump
applications!
Wiring heat pump systems
Wiring conventional systems: forced air and hydronics
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 Rsetting. For more
information, see “Setting Slider Tabs (built-in jumper)” 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.
[7] In Installer Setup, set changeover valve to O (for cool
changeover) or B (for heat changeover).

5
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.
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.

6
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 page 9.
Installer setup (ISU)
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
Note: You can change default MOFR, SASU schedule here.
To edit periods during days, temperature setpoints, or to turn
Schedule On/Off, touch MENU and go to SCHEDULE.
125 Temperature Indication Scale 0 = Fahrenheit
1 = Celsius
200 Heating System Type 1 = Conventional Forced Air Heat
2 = Heat Pump
3 = Radiant Heat
5 = None (Cool Only)
Note: This option selects the basic system type your thermostat
will control.

7
# ISU ISU Name ISU Options (factory default in bold)
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
Note: This option selects the equipment type your thermostat will
control. Note: This feature is NOT displayed if feature 200 is set
to Cool Only.
218 Reversing Valve O/B 0 = O (O/B in Cool)
1 = B (O/B in Heat)
Note: This option is only displayed if the Heat Pump configured.
Select whether reversing valve O/B should energize in cool or in
heat.
220 Cool Stages / Compressor
Stages 200=Conv / 200=HP 0, 1
Note: Select how many Cool or Compressor stages of your
equipment the thermostat will control. Set value to 0 if you do not
have Cool Stage/Compressor Stage.
221 Heat Stages / Backup Heat
Stages Heat Stages: 1 Backup Heat Stages: 0, 1
Note: Select how many Heat or Aux/E stages of your equipment
the thermostat will control.
230 Fan Control in Heat 1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: This ISU is only displayed if ISU 205 is set to Electric Forced
Air or Fan Coil.
300 System Changeover 0 = Manual
1 = Automatic
Note: Thermostat can automatically control both heating and
cooling to maintain the desired indoor temperature. To be able to
select “automatic” system mode on thermostat home screen, turn
this feature ON. Turn OFF if you want to control heating or cooling
manually.
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
(TH4210U only) 0 = Comfort
2 = 2 °F
3 = 3 °F
4 = 4 °F
5 = 5 °F
6 = 6 °F
7 = 7 °F
8 = 8 °F
9 = 9 °F
10 = 10 °F
11 = 11 °F
12 = 12 °F
13 = 13 °F
14 = 14 °F
15 = 15 °F
Advanced setup options (ISU) (continued)

8
# ISU ISU Name ISU Options (factory default in bold)
350 Upstage Timer for Backup
Heat (TH4210U only) 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
365 Compressor Cycle Rate
(Stage 1) 1 - 6 Note: This ISU is only displayed when Cool /Compressor Stage
is set to 1 stage. Cycle rate limits the maximum number of times
the system can cycle in a 1 hour period measured at a 50%
load. For example, when set to 3 CPH, at a 50% load, the most
the system will cycle is 3 times per hour (10 minutes on, 10
minutes off). The system cycles less often when load conditions
are less than or greater than a 50% load.
370 Heating Cycle Rate (Stage 1) 1 - 12
Note: This ISU is only displayed when Heat Stage is set to 1 stage.
Cycle rate limits the maximum number of times the system can
cycle in a 1 hour period measured at a 50% load. For example,
when set to 3 CPH, at a 50% load, the most the system will cycle
is 3 times per hour (10 minutes on, 10 minutes off). The system
cycles less often when load conditions are less than or greater
than a 50% load. The recommended (default) cycle rate settings
are below for each heating equipment type: Standard Efficiency
Gas Forced Air = 5 CPH; High Efficiency Gas Forced Air = 3 CPH;
Oil Forced Air = 5 CPH; Electric Forced Air = 9 CPH; Fan Coil = 3
CPH; Hot Water Radiant Heat = 3 CPH; Steam = 1 CPH.
375 Heating Cycle Rate Auxiliary
Heat (TH4210U only) 1 - 12
387 Compressor Protection 0 = Off
1 - 5minutes
Note: The thermostat has a built in compressor protection
(minimum off timer) that prevents the compressor from restarting
too early after a shutdown. The minimum-off timer is activated
after the compressor turns off. If there is a call during the
minimum-off timer, the thermostat shows “Wait” in the display.
This ISU is displayed if ISU 220 is set to at least 1 stage.
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)
Note: The cool temperature cannot be set below this level.
431 Maximum Heat Setpoint 40 °F to 90 °F (90 °F)
4.5 °C to 32.0 °C (32 °C)
Note: The heat temperature cannot be set above this level.
435 Keypad Lockout 0 = None
1 = Partial
2 = Full
Note:
Unlocked: User has access to all thermostat settings.
Partially Locked: User can modify only temperature settings.
Fully Locked: User cannot modify any settings. Screen will be
locked by default factory code and cannot be changed. This
code is displayed for a short time, when you are about to lock the
thermostat screen. Please
note the code in safe place for future reference.
Advanced setup options (ISU) (continued)

9
Advanced setup options (ISU) (continued)
# ISU ISU Name ISU Options (factory default in bold)
702 Number of Air Filters 0- 2
Note: This ISU refers to the number of air filters in the system.
711 Air Filter 1 Replacement
Reminder 0 = Off
1 = 10 Run Time Days
2 = 20 Run Time Days
3 = 30 Run Time Days
4 = 45 Run Time Days
5 = 60 Run Time Days
6 = 90 Run Time Days
7 = 120 Run Time Days
8 = 150 Run Time Days
9 = 30 Calendar Days
10 = 45 Calendar Days
11 = 60 Calendar Days
12 = 75 Calendar Days
13 = 3 Calendar Months
14 = 4 Calendar Months
15 = 5 Calendar Months
16 = 6 Calendar Months
17 = 9 Calendar Months
18 = 12 Calendar Months
19 = 15 Calendar Months
Note: Set a reminder for when to change your air filter. Choose
either calendar or equipment run time-based reminder.
712 Air Filter 2 Replacement
Reminder 0 = Off
1 = 10 Run Time Days
2 = 20 Run Time Days
3 = 30 Run Time Days
4 = 45 Run Time Days
5 = 60 Run Time Days
6 = 90 Run Time Days
7 = 120 Run Time Days
8 = 150 Run Time Days
9 = 30 Calendar Days
10 = 45 Calendar Days
11 = 60 Calendar Days
12 = 75 Calendar Days
13 = 3 Calendar Months
14 = 4 Calendar Months
15 = 5 Calendar Months
16 = 6 Calendar Months
17 = 9 Calendar Months
18 = 12 Calendar Months
19 = 15 Calendar Months
Note: Set a reminder for when to change your air filter. Choose
either calendar or equipment run time-based reminder.
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
Note: Set to Off in areas that do not follow Daylight Saving Time.
1420 Temperature Display Offset 3 to 3F (0)
1.5 to 1.5C (0)
Note: 0 °F - No difference in displayed temperature and the
actual room temperature. The thermostat can display up to 3 °F
(1.5 C) lower or higher than the actual measured temperature.

10
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
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.
System test System status
Heat
0Heat Off
1Heat On
2Heat On (TH4210U only)
Cool 0Cool Off
1Cool On
Fan 0Fan Off
1Fan On
Em. Heat
(TH4210U only)
0Em. Heat Off
1Em. Heat On
Electrical Ratings
Terminal Voltage (50/60Hz) Running Current
WHeating 2030 Vac 0.021.0 A
(Powerpile) 750 mV DC 100 mA DC
W2 (Aux) Heating (TH4210U only) 2030 Vac 0.021.0 A
EEmergency Heat (TH4210U only) 2030 Vac 0.020.5 A
YCompressor Stage 1 2030 Vac 0.021.0 A
GFan 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