Honeywell Home T4 Pro User manual

Package Includes:
• T4 Pro Thermostat
• UWP™ Mounting System
• Decorative Cover Plate
• Screws and Anchors
• 2 AA Batteries
• Thermostat Literature
T4 Pro
Programmable Thermostat
Product Data
TH4110U2005,
TH4210U2002
M37844
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.
Use supplied
screws and
wall anchors
4
3
2
1
MCR38416

2
UWP Mounting System installation
Use 3x supplied
screws (#8 11/2
for red anchors and
#6 11/2 for yellow
anchors)
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.
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:
a. Position the Cover Plate on wall. Level
and mark hole positions. See Figure 1.
b. 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).
2
1
MCR38417
4
12
3
MCR38409

3
Power options
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 WHeat (stage 1)
C
24VAC common. For 2
transformer systems,
use common wire from
cooling transformer.
KConnect to K on C-wire
adaptor**
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 THP9045A 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.
MCR36094
S
S
Y2
U
U
G
C
Y
A
Rc
W
K
W2
R
L/A
O/B
AUX
E
MCR36776
MCR36114
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
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.
Insert AA
batteries for
primary or
backup power.
R/Rc Slider Tab
(built-in jumper)
UWP Mounting System
MCR36115

4
Wiring diagrams
W R
G
C
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
M38990
1COMMON OPTIONAL.
G USED FOR INDEPENDENT FAN CONTROL ONLY. MOST HEA
T
ONLY, GAS OR OIL FORCED AIR SYSTEMS DO NOT USE A FAN
(G) WIRE.
2
12
FURNACE
R/Rc
SWITCH UP
O/B
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
M38991
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
1COMMON OPTIONAL.
AIR-HANDLER
Y R
G
C
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
1
O/B
R/Rc
SWITCH UP
M38992
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
1COMMON OPTIONAL.
W R
G
C
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
FURNACE
O/B
RW
Y
G
C
1
1
R/Rc
SWITCH UP
M38993
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
OIL FURNACE
O/B
RW
Y
G
CR
1COMMON OPTIONAL.
1
AIR HANDLER
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
R/Rc SWITCH
DOWN
1 Stage Heat Only: Gas or Oil Furnace 1 Stage Cool Only
1H/1C: Gas Furnace +
AirConditioning 2 Transformer System, 1H/1C: Oil Furnace + AirConditioning

5
M38994
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
BOILER
O/B
RW
Y
G
CR
1COMMON OPTIONAL.
1
AIR HANDLER
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
R/Rc SWITCH
DOWN
M38995
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
BOILER
O/B
R (T)W (T)
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
R/Rc SWITCH
UP
M38996
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
BOILER
R/Rc SWITCH
UP
O/B
R (T)
W (T)
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
1COMMON OPTIONAL TO THERMOSTAT.
C
V8043
ZONE VALVES
1
TH
TR
TRANSFORME
R
R
24 VOLTS
END SWITCH
M38997
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
R/Rc SWITCH
UP
O/B
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
1COMMON OPTIONAL TO THERMOSTAT.
THERMOSTAT MUST BE CONFIGURED FOR RADIANT HEAT
WITH 0 COOL STAGES.
C
POWER OPEN/
POWER CLOSED
ZONE VALVE
1
5
TRANSFORMER
R
2
L2
L1
120 VOLT
SUPPLY
2
63
41
TO AUXILIARY
CIRCUIT FOR
OPERATING BOILER.
(SEE VALVE
INSTUCTIONS)
2
2 Transformer System, Hot Water Heat
with AirConditioning (or Hot Water
Coil)
Hot Water Boiler, Heat Only
Hot Water Heat with Power Open Zone
Valve Hot Water Heat with Power Open/ Power Closed, Series 20 Zone Valve

6
M38998
COMPATIBLE MODELS:
TH4110U2005
TH4210U2002
1COMMON OPTIONAL.
L CONNECTION (HEAT PUMP FAULT) NOT AVAILABLE ON T1 AND T4
MODELS. THE TH6210U2001 CAN BE USED IF FAULT INDICATION ON
THERMOSTAT IS NEEDED.
SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VAL
VE.
DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS!
THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY.
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
HEAT PUMP/
AIR-HANDLER
O/B
1
1
R
O
Y
G
CL
2
3
4
1
21
3
4
R/Rc
SWITCH UP
M39002
COMPATIBLE MODELS:
TH4210U2002
1
COMMON OPTIONAL.
L CONNECTION (HEATPUMP FAULT) NOT AV
AILABLE ON TH4210U2002
MODEL. THE TH6210U2001 CAN BE USED IF FAULT INDICATION ON
THERMOSTAT IS NEEDED.
SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVE.
DIFFERENT HEAT PUMP MODELS LABEL THE AUXILIARY HEAT
TERMINAL DIFFERENTLY THAN SHOWN. CONSULT HEAT PUMP
WIRING GUIDE.
IF AUX HEAT LOCKOUT ON HIGH OUTDOOR TEMPERATURE IS
REQUIRED, USE TH6220U2000 THERMOSTAT AND C7089U1006
OUTDOOR SENSOR. THE TH4210U2002 CANNOT DO THIS.
MOST HEAT PUMPS SHARE THE SAME SET OF HEAT STRIPS FOR AUX
AND EM HEAT. IN THOSE CASES E ISN’T USED. IF YOU HAVE SEPARATE
HEAT SOURCES FOR THE AUX AND EM HEAT, THE TH4210U2002 CANNOT
BE SET TO DO THIS. THE TH6320U2008 MODEL CAN BE CONFIGURED
FOR SEPARATE AUX AND E. IF THIS IS DONE, WIRE ONE SET OF STRIPS
TO E TO BE ENERGIZED IN EM HEAT AND A DIFFERENT SET OF STRIPS
TO AUX TO BE ENERGIZED IN AUX HEAT.
DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP
APPLICATIONS! THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY.
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
HEAT PUMP/
AIR-HANDLER
R/Rc
SWITCH UP
O/B
1
RAUX
L
G
CO
Y
2
3
4
5
6
7
234
6
7
5
1H/1C: Heat Pump without Aux Heat 2H/1C: Heat Pump with Electric Aux
Heat

7
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.
MCR36116
MCR36517A
MCR36518A

8
Set the time and date
Time
1 Press Menu, and then press to go to TIME.
Press Select.
2 Press or to choose between 12 or 24 hour.
Press Select.
3 Use or to adjust the hour. Press Select.
4 Use or to adjust the minutes. Press Select
to exit Time menu.
Date
1 If previously setting time, continue to Step
2. If at the Home screen, press Menu on your
thermostat.
2 Press or to go to DATE. Press Select.
3 Use or to adjust year. Press Select.
4 Use the or to adjust month. Press Select.
5 Use the or to adjust Date. Press Select to
save and exit Date menu.
MCR36519A
MCR36523
Program Schedule
You can program four time periods each day, with different settings for weekdays
and weekends. We recommend the pre-sets (shown in the table below), since they
can reduce your heating/cooling expenses.
Wake - Set to the time you wake up and the
temperature you want during the morning, until
you leave for the day.
Away - Set to the time you leave home and the
temperature you want while you are away (usually
an energy-saving level).
Home - Set to the time you return home and the
temperature you want during the evening, until
bedtime.
Sleep - Set to the time you go to bed and the
temperature you want overnight (usually an
energy-saving level).
NOTE: To temporarily or permanently override any of the above program
schedules, see page 4.
Heat Cool
Wake
(6:00 am)70 °78 °
Away
(8:00 am)62 °85 °
Home
(6:00 pm)70 °78 °
Sleep
(10:00
pm)62 °82 °

9
To adjust program schedules
1 Press Menu on your thermostat.
2 PROG is displayed. Press Select. Then ON
is displayed. (If you do not want to use a
schedule, press or to display OFF.
Press Select.) Press Select.
3 Press or to select day or set of days to
edit. Press Select.
4 Press or to select a schedule period to
edit (Wake, Away, Home, and Sleep). Press
Select.
5 ON is displayed. Press Select to keep the
schedule period on. Or press and then Select to turn off the schedule period.
6 Time starts blinking. Press or to adjust the schedule period start time.
Press Select.
7 Temperature starts blinking. Press or to adjust the “Heat” setpoint
temperature. Press Select. Press or to adjust the “Cool” temperature
setpoint. Press Select.
8 Repeat steps 4 through 7 for the remaining schedule periods.
9 Press Home when you’re finished to save and return to the home screen.
10 Schedule can be adjusted and turned ON or OFF by returning to Menu and
following the steps provided above.
MCR36519A
Program schedule override (permanent)
Program schedule override (temporary)
1 Press or to adjust the temperature.
2 Once at the desired setpoint temperature,
no further action is needed. The new
setpoint temperature will be held until the
next scheduled time period begins. For more
information on schedule time periods, see
“Program Schedule” on page 3.
3 To cancel the Temporary Hold, Press or
and then press Cancel.
1 Press or to adjust the temperature.
2 TEMPORARY HOLD is displayed and
the setpoint temperature flashes. While
it’s flashing, press Hold (Mode) button to
change to Permanent Hold.
3 To cancel the Permanent Hold, press or
and then press Cancel.
MCR36525
A
MCR36524A

10
MCR36526A
Adaptive Intelligent Recovery
Over time, the T4 Pro Thermostat “learns” how long it takes your system to reach
the temperature you want. It turns on the heating or cooling system earlier to
make sure you’re comfortable at the time you expect.
Damage can occur if the compressor is
restarted too soon after shutdown. This
feature forces the compressor to wait for a few
minutes before restarting.
During the wait time, the display will flash
the message Cool On (or Heat On if you have
a heat pump). When the safe wait time has
elapsed, the message stops flashing and the
compressor turns on.
Built-in compressor protection
Message flashes until safe
restart time has elapsed.
Adjusting keypad lockout
1 Press Menu on the thermostat.
2 Press or to go to LOCK. Press Select.
3 Press or to go to OFF, PART, or ON, and then press Select.
OFF: Unlocked, and full access allowed.
PART: Partial lockout, allowing only the temperature to be changed.
ON: No access allowed.
4 To unlock the keypad, press the CENTER button and then enter the password
“1234”. To enter the password, press or to change the first digit of the
number. Then press Select. Repeat this process to enter the second through
fourth digits of the number. Once all four numbers have been entered, press
Select again.
5 This will unlock the keypad.
6 If the code is incorrect, the screen will flash the lines "--".
7 Press Back to go back a step to enter the correct number and press Select.
NOTE: On some models keypad lockout is not available under menu if the
installer did not enable the lockout during the installer setup.
Adjusting idle backlight display brightness
1 Press Menu on the thermostat.
2 Press or to go to LITE. Press Select.
3 Current brightness setting is displayed (15).
4 Press or to adjust backlight brightness.
5 Press Select to save and exit LITE menu.
NOTE: Backlight is only displayed if the C (common) wire is connected.

11
Batteries are optional (to provide backup
power) if your thermostat was wired to run on
AC power when installed. If your thermostat
was not wired to run on AC power, then
batteries are required.
Install fresh batteries immediately when the
low battery icon appears. The icon appears
about two months before the batteries are
depleted.
Even if the low battery icon does not appear,
you should replace batteries once a year, or
before leaving home for more than a month.
If batteries are inserted within two minutes, the
time and day will not have to be reset. All other
settings are permanently stored in memory,
and do not require battery power.
NOTE: When replacing batteries, alkaline
batteries are recommended.
Battery replacement
Insert fresh alkaline AA
batteries and reinstall
thermostat.
When the low battery
warning appears, press
gently to loosen the
thermostat and then
carefully pull it from the
wall mount.
M36010
M36114
MCR36116
Alerts
If there is an alert or reminder, the alert icon
appears on the Home screen.
Low Battery Warning
1 The batteries need to be replaced when
BATT, the alert icon , and the battery icon
are displayed on the Home screen.
2 When the battery power is very low, the
thermostat’s backlight is disabled to save
battery power.
3 When battery power is critically low, only
BATT, the alert icon , and the battery icon
are displayed.
M36531
M36530A

12
Air Filter Reminder
1 The alert icon appears on the Home
screen.
2 Press Menu, and then press until display
shows ALRT.
3 Press Select to display which alert(s) are
present.
4 The message REPL (REPLACE AIR FILTER)
appears.
5 The reminder can be snoozed or cleared.
Resideo recommends changing the air filter
before clearing the reminder.
6 To snooze, press Select. The word SNZE
(SNOOZE) appears.
7 Press Select again to snooze the reminder for
7 days.
8 To clear, press Select, and then press to go
to CLER (Clear).
9 Press Select to clear the air filter reminder.
Snoozing and Clearing Alerts or
Reminders*
1 Press Menu, and then press until display
shows ALRT.
2 Press Select to display which alert(s) are
present.
3 The word SNZE (SNOOZE) appears.
4 Press Select again to snooze the reminder for
7 days.
5 To clear the alert, press Select, and then
press to go to CLER (Clear).
6 Press Select to clear the reminder.
* Some alerts cannot be snoozed or cleared. Please
call your local heating and cooling professional if this occurs. The
heating and cooling system may require service.
M36532
MCR36533

13
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 16.
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.
MCR36520
MCR36535

14
# 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. An advanced algorithm fixes
the 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)

15
# 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 Setting on original T4 models:
0 = None
1 = Partial
2 = Full
Setting on current T4 models:
0 = Disabled
1 = Enabled
Note: Due to customer feedback this feature was changed. On
the original software you can lockout the thermostat from the
ISU the same as you can from menu lockout. For later versions,
this setting allows the contractor to enable or disable the lockout
feature. When disabled, there is no lockout option under menu.
Lockout code is 1234.
Advanced setup options (ISU) (continued)

16
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.

17
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
MCR36521A
MCR36522
Electrical Ratings
Terminal Voltage (50/60Hz) Running Current
WHeating 2030 Vac 0.021.0 A
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

18
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
(see page 3).
Heating
or cooling
system does
not respond
• Press Mode button to set system Heat (see page 7). Make
sure the desired temperature is set higher than the inside
temperature.
• Press Mode button to set system Cool (see page 7). 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” on page
4.
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” on page
4.

19

Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
18004681502
3300614EFS02 M.S. Rev. 0522 | Printed in United Stateswww.resideo.com
© 2022 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license
from Honeywell International, Inc. This product is manu-
factured by Resideo Technologies, Inc. and its affiliates.
Tous droits réservés. La marque de commerce Honeywell
Home est utilisée avec l’autorisation d’Honeywell
International, Inc.
Ce produit est fabriqué par Resideo Technologies, Inc. et
ses sociétés affiliées.
Todos los derechos reservados. La marca comercial
Honeywell Home se utiliza bajo licencia de Honeywell
International, Inc.
Este producto es fabricado por Resideo Technologies, Inc.
y sus afiliados.
33-00614EFS-02
For assistance with this product, please visit
customer.resideo.com.
Or call Customer Care toll-free at
18004681502.
Customer assistance
Pull to remove the thermostat
from the UWP.
+
MCR36080
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.
CAUTION: ELECTRONIC WASTE NOTICE
The product and batteries should not be disposed of with other household
waste. Check for the nearest authorized collection centers or authorized
recyclers. The correct disposal of end-of-life equipment will help prevent
negative consequences for the environment and human health.
CAUTION: EQUIPMENT DAMAGE HAZARD
Compressor protection is bypassed during testing. To prevent equipment
damage, avoid cycling the compressor quickly.
CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before
beginning installation.
FCC statement available at https://customer.resideo.com/enUS/support/
residential/codes-and-standards/FCC15105/Pages/default.aspx