Page 1
TH8320U and TH8321U Touch Screen
Programmable Thermostats
INSTALLATION INSTRUCTIONS
APPLICATION
The TH8320U and TH8321U Touch Screen Universal Programmable Thermostats provide electronic control of 24 Vac
heating and cooling systems or 750 mV heating system. See Table 1 for a general description.
Table 1. TH832 Thermostats Description.
Model
TH8320U Batteries or
TH8321U System and Fan selection
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of the old control.
Power
Method Changeover System Selection Fan Selection Comments
common wire
Automatic or
manual
selectable
Heat-Off-CoolAuto (Em. Heat for
heat pumps)
On-Auto-Circ System and Fan selection
vary based on system type
vary based on System type.
Humidity sensor to control
dehumidification.
Selecting Location
Install the thermostat about 5 ft. (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause
a hazardous condition.
2. Check the ratings given in the instructions to make
sure the product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc. • • All Rights Reserved
NO
NO
YES
NO
5 FEET
[1.5 METERS]
Fig. 1. Selecting thermostat location.
M19925
69-1706
Page 2
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
CO
L
SC
S
H
UMP
S1
2
C
G
C
Do not install the thermostat where it can be affected by:
— Drafts or dead spots behind doors and in corners.
— Hot or cold air from ducts.
— Radiant heat from sun or appliances.
— Concealed pipes and chimneys.
— Unheated (uncooled) areas such as an outside wall
behind the thermostat.
Installing Wallplate
CAUTION
Electrical Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before wiring.
The thermostat can be mounted horizontally on the wall
or on a 4 in. x 2 in. (101.6 mm x 50.8 mm) wiring box.
1. Position and level the wallplate (for appearance
only).
2. Use a pencil to mark the mounting holes.
WALL
WIRES THROUGH WALL
AND WIRE SLOT
WALL ANCHORS (2)
MOUNTING
HOLES (2)
MOUNTING
SCREWS (2)
Fig. 2. Mounting wallplate.
3. Remove the wallplate from the wall and, if drywall,
drill two 3/16-in. holes in the wall, as marked. For
firmer material such as plaster, drill two 7/32-in.
holes. Gently tap anchors (provided) into the drilled
holes until flush with the wall.
4. Position the wallplate over the holes, pulling wires
through the wiring opening. See Fig. 2.
5. Insert the mounting screws into the holes and
tighten.
M19916
3. Securely tighten each screw.
4. Push excess wire back into the hole.
5. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
EAT P
NVENTIONA
Y2
L
E
AUX
S1
S2
Fig. 3. Selecting terminal identifications for
Table 2. Selecting Terminal Identifications for
W2
S
system type.
System Type.
System Type
R
W
Y
REW TERMINAL
Wallplate
Terminal
Identifications
RC
R
O/B
Y
G
C
M19951
Wiring
Diagram
Reference
Standard Heat/Cool Conventional 5, 6
Heat Only Conventional 7
Heat Only with Fan Conventional 8
Heat Only Series 20 Conventional 9
Cool Only Conventional 10
Standard Multistage
up to 2 Heat/2 Cool
Heat Pump with No
Auxiliary Heat
Heat Pump with
Auxiliary Heat
Conventional 11, 12
Heat Pump 13, 14
Heat Pump 15, 16
WIRING (FIG. 5-16)
All wiring must comply with local electrical codes and
ordinances.
1. Select set of terminal identifications (Table 2) that
corresponds with system type (conventional or
heat pump in Fig. 3).
2. Loosen the screws for the appropriate system type
selected; see Table 2. Insert wires in the terminal
block under the loosened screw. See Fig. 4.
69-1706 2
Fig. 4. Inserting wires in terminal block.
IMPORTANT
Use 18 gauge thermostat wire.
M19917
Page 3
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
CONVENTIONAL
RC
Y2
W2
S1
S2
3
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
Fig. 5. Typical hookup of conventional single-stage
heat and cool system with single transformer
Y2
W2
S1
S2
3
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
REMOVE FACTORY INSTALLED JUMPER.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
2
R
W
Y
G
C
CONNECTION
FAN
RELAY
COMPRESSOR
CONTACTOR
HEAT RELAY
(1H/1C conventional).
CONVENTIONAL
RC
2
R
W
Y
G
C
CONNECTION
FAN
RELAY
COMPRESSOR
CONTACTOR
HEAT RELAY
OPTIONAL
24 VAC
COMMON
OPTIONAL
24 VAC
COMMON
M19895
M19896
CONVENTIONAL
RC
1
R
C
Y2
W2
S1
S2
3
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
Fig. 7. Typical hookup of heat-only system
Y2
W2
1
R
C
1
C
R
OUTDOOR/INDOOR
1
2
3
S1
S2
3
TEMPERATURE
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
FACTORY INSTALLED JUMPER.
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
Fig. 8. Typical hookup of heat only system with fan
2
R
W
Y
G
C
HEAT RELAY
(1H conventional).
CONVENTIONAL
RC
2
R
W
Y
G
C
FAN
RELAY
HEAT RELAY
(1H conventional).
CONNECTION
OPTIONAL
24 VAC
COMMON
OPTIONAL
24 VAC
COMMON
CONNECTION
1
R
C
M19897
1
R
C
M19898
Fig. 6. Typical hookup of conventional single-stage
heat and cool system with two transformers
(1H/1C conventional).
3 69-1706
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TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
C
G
CS2S1
CO
L
CONVENTIONAL
RC
Y2
W2
S1
S2
3
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
2
R
W
Y
G
C
W BR
SERIES 20
MOTOR OR
TR
TR
1
VALVE
M19899
Fig. 9. Typical hookup of heat only Series 20 system.
NVENTIONA
R
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY 2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST
HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
COOL RELAY 2 COOL RELAY 1
HEAT RELAY 1
R
C
CONVENTIONAL
RC
Y2
W2
S1
S2
3
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
Fig. 10. Typical hookup of cool only system
COMMON CONNECTION
MUST COME FROM
2
R
W
Y
G
C
RELAY
COMPRESSOR
CONTACTOR
(1C conventional).
OPTIONAL 24 VAC
THE COOLING
TRANSFORMER.
FAN
OPTIONAL
24 VAC
COMMON
CONNECTION
FAN RELAY
M19901
1
R
C
M19900
1
R
C
Fig. 11. Typical hookup of conventional multistage two-stage heating and two-stage cooling
in a single transformer system (2H/2C or 2H/1C or 1H/2C conventional).
69-1706 4
Page 5
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
C
G
CS2S1
CO
L
C
O/
G
C
UX
SI
S2
P
3
COMMON CO
ON
NVENTIONA
R
OPTIONAL 24 VAC
COMMON CONNECTION
MUST COME FROM
THE COOLING
TRANSFORMER.
OUTDOOR/INDOOR
3
TEMPERATURE
SENSOR
HEAT RELAY 2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER REMOVED.
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABL
3
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 12. Typical hookup of conventional multistage two-stage heating and two-stage cooling
in a two-transformer system (2H/2C or 2H/1C or 1H/2C conventional).
COOL RELAY 2 COOL RELAY 1
HEAT RELAY 1
FAN RELAY
HEAT PUM
R
1
R
C
M19902
1
R
C
1
R
C
B
A
OPTIONAL 24 VAC
NNECTI
OUTDOOR/INDOOR
4
TEMPERATURE
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
FACTORY INSTALLED JUMPER.
2
"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
4
FROM THE THERMOSTAT CABLE.
CHANGEOVER
VALV E
Fig. 13. Typical hookup of single-stage heat pump with no auxiliary/backup heat (1H/1C heat pump).
5 69-1706
FAN RELAY
COMPRESSOR
M19903
Page 6
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
C
O/
G
C
UX
SI
S2
P
3
COMMON CO
ON
O/
G
C
UX
SI
S2
P
6
5
COMMON CO
ON
HEAT PUM
R
B
A
OPTIONAL 24 VAC
NNECTI
OUTDOOR/INDOOR
TEMPERATURE
5
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
FACTORY INSTALLED JUMPER.
2
MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE USED AS A 24 VAC
3
OUTPUT. SEE "L TERMINAL" SECTION FOR MORE INFORMATION.
4
"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
5
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE
THERMOSTAT CABLE.
CHANGEOVER
VALV E
Fig. 14. Typical hookup of multistage heat pump with no auxiliary/backup heat (2H/2C heat pump).
HEAT PUM
FAN RELAY
COMPRESSOR 1COMPRESSOR 2
EQUIPMENT
MONITOR
M19904
1
R
C
1
R
C
A
3
OUTDOOR/INDOOR
TEMPERATURE
4
SENSOR
HEAT 2 RELAY
(AUXILIARY HEAT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
FACTORY INSTALLED JUMPER.
2
OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
4
FROM THE THERMOSTAT CABLE.
MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE USED AS
5
A 24 VAC OUTPUT. SEE "L TERMINAL" SECTION FOR MORE INFORMATION.
"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
6
Fig. 15. Typical hookup of single-stage heat pump with auxiliary/backup heat (2H/1C heat pump).
69-1706 6
EMERGENCY
HEAT RELAY
B
CHANGEOVER
VALV E
OPTIONAL 24 VAC
NNECTI
FAN RELAY
COMPRESSOR
RELAY
M19905
Page 7
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
O/
G
C
UX
SI
S2
P
6
5
COMMON CO
ON
HEAT PUM
EQUIPMENT
MONITOR
B
A
OPTIONAL 24 VAC
NNECTI
OUTDOOR/INDOOR
3
TEMPERATURE
4
SENSOR
HEAT 2 RELAY
(AUXILIARY HEAT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
FACTORY INSTALLED JUMPER.
2
OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT.
3
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
4
FROM THE THERMOSTAT CABLE.
MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE USED AS
5
A 24 VAC OUTPUT. SEE "L TERMINAL" SECTION FOR MORE INFORMATION.
"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
6
EMERGENCY
HEAT RELAY
COMPRESSOR 2 COMPRESSOR 1
CHANGEOVER
VALV E
FAN RELAY
Fig. 16. Typical hookup of multistage heat pump with auxiliary/backup heat (3H/2C heat pump).
Powering the Thermostat
There are two different ways to power the thermostat:
• Batteries (three AAA alkaline).
• 24 Vac Common wire.
M19906
1
R
C
Wiring 24 Vac Common
Wire the common side of the transformer to the C screw
of the thermostat wallplate. When installing in a single
transformer system, keep jumper wire between the R
and Rc screws. When installed in a two-transformer
system, use the common from the cooling transformer to
connect to C screw and remove the jumper wire between
the R and Rc screws.
Inserting Batteries (Optional)
If not using a 24 Vac Common to power the thermostat,
install three AAA alkaline batteries (included) in the back
of the thermostat. Make sure the positive and negative
terminals are oriented correctly, as marked on the device.
See Fig.17.
BATTERIES (3)
M19918
Fig. 17. Installing batteries on thermostat back.
Mounting the Thermostat
1. Align the terminal screw blocks with the pins on the
back of the thermostat.
2. Push the thermostat straight onto the wallplate.
See Fig. 18.
7 69-1706
Page 8
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
E
MON
UE
THUSASUN
E
MON
THUSASUN
CHANGE FILTER UV LAMP HUMIDIFIER PAD
OK TO PICK MULTIPLE DAYS SCREEN LOCKED
USE ARROWS TO SET YEAR AND TIME
R
U
WALL
INSTALLATION
REMOVE DURING
M19919
Fig. 18. Mounting thermostat on wallplate.
Adjusting Real-Time Clock
Setting Calendar and Time
Locate and remove the tab labeled Remove in the lower
left corner on the thermostat back. The tab must be
removed to activate the real-time clock. See Fig. 19.
REMOVE TAB TO ACTIVATE REAL TIME CLOCK
INSTALLATION
REMOVE DURING
INSTALLATION
REMOVE DURING
M19920
Fig. 19. Removing tab to activate real-time clock.
This thermostat is designed to automatically keep the
current time and day in memory for up to ten years under
normal use once the calendar is set. When the
thermostat is first powered, the display is ready for the
calendar date to be entered. See Fig. 20.
SET CURRENT DAY
SET MONTH
T
DON
DON
M19921
Fig. 20. Setting calendar and time after initial
IMPORTANT
The tab on the back of the thermostat in the
lower left corner must be removed for this
feature to be active.
powerup.
Using the Thermostat
The thermostat has a touch screen interface. Words or
symbols appear, highlighting the keys, as necessary, to
complete tasks. Always press the keys with your fingertips. Sharp instruments like a pen or pencil point can
damage the thermostat.
1. Use the arrow keys to set the Year, Month and Day,
as shown in Fig. 20.
2. Press the Done key.
3. Use the arrow keys to set the current time. See
Fig. 20.
4. Press the Done key.
69-1706 8
Page 9
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
E
MON
UE
THUSASUN
SYSTEM
OFF
COOL
g
Schedule
de
Se
o
OPERATION
System and Fan Settings
The System default setting is Heat and the Fan default
setting is Auto.
SYSTEM SETTINGS
Heat: Thermostat controls heating system.
Off: Both heating and cooling are off.
Cool: Thermostat controls cooling system.
Auto: Thermostat automatically changes between
heating and cooling systems, depending on indoor
temperature. (See Installer Setup section.)
Em Heat: Emergency heat cycles to maintain
temperature. Compressor is locked out. (Used only for
heat pump systems with backup heat.)
FAN SETTINGS
The Fan setting can be programmed into the thermostat
schedule for each period (Wake, Leave, Return, Sleep).
See the Owners’ Guide for additional information.
LED Indication (Requires 24 Vac Common
Connection)
An LED indicator is located in the upper right corner of
the thermostat. It is only visible when lighted:
• It indicates when the thermostat is in the Emergency
Heat mode. When in Em. Ht. mode, the L terminal is
continuously energized and the LED is on.
• When the L terminal is wired to an equipment monitor,
the LED signals when a check or fail signal is sent to
the thermostat from the system. See Fig. 21. (This
can occur only when the thermostat is not in Em. Ht.
mode.)
C
EQUIPMENT
MONITOR
L TO R
Fig. 21. L terminal switch to R (power) side of system
transformer.
TO C
M19907
INSTALLER SETUP
This Universal Thermostat works with many different
system types. To operate correctly, the thermostat must
be set up to operate the installed heating and/or cooling
system.
Installer Setup Menus
Main Menu: Offers the most commonly used options.
It is necessary to enter this menu to set the
thermostat to the type of system it is operating. Many
applications use only the Main Menu.
Regional Menu: Offers choices often changed due to a
particular area or region. For example, temperature
display in Fahrenheit or Celsius is offered in this menu.
Advanced Settings Menu: Offers more settings to fully
customize the thermostat. Many of these settings do not
require changing from the factory settings.
Entering Installer Setup
1. Thermostat must be powered either with Alkaline
AAA batteries or with 24 Vac Common wire.
2. From the home screen, press System key. (Press
Done or Cancel key to return to home screen.)
3. Five blank touch keys show on the bottom of the
screen between the Done and Cancel keys. Press
and hold the two blank keys on either side of the
center blank key for approximately five seconds
until screen changes. See Fig. 22.
T
Insi
DON
t T
Followin
CANCEL
Preprogrammed Settings
Table 3 shows the default program settings. See Owners’
Guide for complete instructions on changing the
program.
Table 3. Default Program Settings.
70
(21
62
(16.5
70
(21
62
(16.5
Setpoints
°
F
°
C)
°
F
0
C)
°
F
°
C)
°
F
°
C)
°
78
(25.5
°
85
(29.5
°
78
(25.5
°
82
(28
F
F
F
F
°
C)
Schedule
Period Time
Wake 6:00AM
Leave 8:00AM
Return 6:00PM
Sleep 10:00PM
M19923
Fig. 22. Entering Installer Setup.
Fan
SettingHeat Cool
Auto
°
C)
Auto
0
C)
Auto
°
C)
Auto
9 69-1706
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TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
DONE
MON
THUSASUN
A
4. The Installer Setup Number is displayed in the
lower left. It is a four-digit code beginning with zero.
The factory setting or other choice selection is displayed in the lower right. See Fig. 23. This is a twodigit code shown in the Option column of Table 4.
ADVANCE TO NEXT
INSTALLER
SETUP NUMBER
PRESS TO EXIT
INSTALLER SETUP
Fig. 23. Installer Setup Number and factory setting
selection locations.
INSTALLER SETUP
FACTORY
SETTING
CHANGE THE
FACTORY
SETTING
M19922
Changing Installer Setup Selections
1. Advance to the next Installer Setup Number by
pressing the up and down arrow keys to the right of
the four-digit Installer Setup Number. See Fig. 23.
2. Change the factory Setting Options by pressing the
up and down arrow keys to the right of the two-digit
code selection. See Fig. 23.
Exiting Installer Setup
1. Press the Done key to exit the Installer Setup
screen.
IMPORTANT
The three Installer Setup Menus (Tables 4-6)
show all the available options. These options
customize themselves as you make selections
to the Installer Setup. Therefore, not all Installer
Setup Selections are shown or are available to
change.
Table 4. Main Installer Setup Menu.
Factory Setting Other Choices
Installer
Select
Setup
Number
Not used. 1 thru 0099 — — — — —
Date (Year
Upper)
Date (Year
Lower)
Date (Month) 0140 6 Digit(s) represents
Date
(Day)
Schedule
Options
0120 20 Set first two digits of
0130 04 Represents last two
0150 15 Digit(s) represents
current calendar year
(20 for year 2005, etc)
digits of current
calendar year (2004).
current calendar
month.
current calendar date.
21 21 —first two digits of
00 -99 Select last two digits of
1-12 Select number that
1-31 Select number that
current calendar year
(21xx)
current calendar year.
represents current
calendar month.
represents current
calendar date.
0160 4 7-day programming 0 0 —nonprogrammable —
CommentsOption Description Options Description
2000 -2178
available
2001-2178
available
—
—
69-1706 10
Page 11
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Table 4. Main Installer Setup Menu. (Continued)
Factory Setting Other Choices
Installer
Select
System Type
Selection
Fan Operation 0180 0 Conventional
Reversing
Valve (O/B)
Operation
Backup Heat
Source
(Auxiliary
Heat)
External Fossil
Fuel Kit
Cycles per
hour (cph) for
1st Stage
Compressor
Cycles per
hour (cph) for
2nd Stage
Compressor
Setup
Number
0170 1 1 Heat/1Cool 1-12 1— 1 h e a t / 1 c o o l
applications where
equipment controls fan
operation in heat
mode.
0190 0 O/B terminal is
0200 0 Heat pump backup
0210 1 External fossil fuel kit
0220 3 Compressor Stage 1
0230 3 Compressor Stage 2
energized for reversing
valve in cooling
heat source is electric.
is controlling heat
pump backup heat
cycles per hour (cph)
cycles per hour (cph)
2—single-stage heat
p u m p ( n o a u x . h e a t )
3— h e a t o n l y ( n o f a n )
4— h e a t o n l y ( w i t h f a n )
5—hot water Series 20
(3-wire or normally open
z o n e v a l v e s )
6— c o o l o n l y
7—2 heat/1cool heat
pump
8—2 heat/2 cool
multistage conventional
9—2 heat/1cool
multistage conventional
10—1 heat/2 cool
multistage conventional
11—2 heat/2 cool heat
pump (with no auxiliary
hea t)
12—3 heat/2 cool heat
pump (with auxiliary heat)
1 Heat pump or electric
1 O/B terminal is energized
1 Heat pump backup heat
0 No external fossil fuel kit
1-6 1-6 available;
1-6 1-6 available;
heat applications where
thermostat controls fan
operation in heat mode.
for reversing valve in
heating
source is fossil fuel.
is controlling heat pump
backup heat. This thermostat controls the backup
fossil fuel heat with
outdoor sensor (C7089U).
3 is recommended.
3 is recommended.
CommentsOption Description Options Description
Available
options and
defaults vary
by thermostat. System
selection
automatically
modifies
some default
settings and/
or hides other
Installer Setup options.
Only shown if
conventional
system is
selected. If
heat pump is
chosen, fan
defaults to
electric.
Only shown if
heat pump
system is
chosen.
Only shown if
2 heat/1 cool
or 3 heat/2
cool heat
pump is
chosen.
Only shown if
fossil fuel is
chosen as
backup heat
source.
—
Only shown if
two stages of
cool are
selected.
11 69-1706
Page 12
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Table 4. Main Installer Setup Menu. (Continued)
Factory Setting Other Choices
Installer
Select
Cycles per
hour (cph) for
1st Stage
Conventional
Heat
Cycles per
hour (cph) for
2nd Stage
Heat
Setup
Number
0240 5 Conventional Heat
0250 5 Cycles per hour (cph)
Stage 1 cycles per
hour (cph)
for 2nd Stage
Conventional Heat or
Auxiliary Heat for
2 H/1C Heat Pump
Systems
1-12 1-12 available; typical
1-12 1-12 available; typical
s e t t i n g s :
1—1 cph used for steam
o r g r a v i t y s y s t e m .
3—3 cph used for hot
water systems or high
efficiency (90% or better)
fossil fuel forced air
s y s t e m s.
5—5 cph used for
standard fossil fuel forced
air systems.
9—9 cph used for electric
forced air heat systems.
s e t t i n g s :
1—1 cph used for steam
or gravity system.
3—3 cph for hot water
systems or high efficiency
(90% or better) fossil fuel
forced air systems.
5—5 cph for standard
fossil fuel forced air
s y s t e m s.
9—9 cph used for electric
forced air heat systems
(electric auxiliary heat for
heat pump systems).
CommentsOption Description Options Description
Not shown if
system
selection is
heat pump.
Selection in
this stage
changes
default cph
for 2nd stage
heat.
Only shown if
two stages of
heat are
selected.
69-1706 12
Page 13
Select
Cycles per
hour (cph) for
3rd Stage
Heat
Cycles per
hour (cph) for
Em Heat
Continuous
Backlight
Additional
Menu Choices
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Table 4. Main Installer Setup Menu. (Continued)
Factory Setting Other Choices
Installer
Setup
Number
0260 9 Cycles per hour (cph)
0270 9 Cycles per hour (cph)
0280 0 Backlight not on
0290 0 Only main menu
for Auxiliary Heat in
3H/2C Heat Pump
Systems
for Emergency Heat
continuously.
Thermostat backlight
comes on with each
key press.
options are shown.
Installer Test Options
shown next (Table 7).
1-12 1-12 available; typical
1-12 1-12 is available; typical
1 Backlight is on
1,2 1—Main Menu and
s e t t i n g s :
1—1cph for steam or
g r a v i t y s y s t e m .
3—3 cph for hot water
systems or high efficiency
(90% or better) fossil fuel
forced air systems.
5—5 cph for standard
fossil fuel forced air
s y s t e m s .
9—9 cph for electric
forced air heat systems.
(electric auxiliary heat for
heat pump systems).
s e t t i n g s :
3—3 cph for hot water
systems or high efficiency
(90% or better) fossil fuel
f o r c e d a i r s y s t e m s .
5—5 cph for standard
fossil fuel forced air
s y s t e m s .
9—9 cph for electric heat
systems.
continuously (thermostat
must have a common wire
attached for this function).
Regional Settings are
shown plus Installer Test
(Tables 5 and 7 only).
2—All remaining Menu/
Options shown plus
Installer Test (Tables 5, 6
and 7).
CommentsOption Description Options Description
Only shown
if 3H/2C heat
pump system
is selected.
Only shown if
2 heat/1 cool
or 3 heat/2
cool heat
pump is
selected.
Option is
always
shown;
however,
continuously
on backlight
works only if
thermostat is
wired with 24
vac Common.
The majority
of application
require only
the Main
Menu
Options.
13 69-1706
Page 14
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Table 5. Regional Settings Menu.
Installer
Select
Setup
Number
Changeover 0300 0 Manual changeover 1 1—auto
Deadband 0310 3 Heating and cooling
Temperature
Indication
Scale
Daylight
Savings
0320 0 Temperature is
0330 1 Daylight savings
Factory Setting Other Choices
changeover
setpoints can be set
no closer than 3
°
(1.5
C)
displayed in
enabled (United
States).
°
F
°
F.
2 thru 9 Heating and
1 Temperature is
0 0—daylight savings
cooling setpoints
can be set no
c l o s e r t h a n c h o s e n
v a l u e :
°
2—2
°
3—3
°
4—4
°
5—5
°
6—6
°
7—7
°
8—8
°
9—9
displayed in °C.
is disabled.
F (1°C )
F (2°C )
F (2.5°C )
F (3°C )
F (3.5°C )
F (4°C )
F (4.5°C )
F (5°C)
CommentsOption Description Options Description
—
Shown only if
automatic
changeover is
selected.
—
Set to 0 in areas that
do not follow
daylight savings.
69-1706 14
Page 15
Select
Remote
Temperature
Sensor
(Outdoor or
Indoor)
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Table 5. Regional Settings Menu. (Continued)
Installer
Setup
Number
0340 0 No remote
Factory Setting Other Choices
temperature sensor
1-3 1—outdoor
temperature sensor
for display only.
2—outdoor
temperature sensor
for control. Used for
select heat pump
systems. (See
Special Heat Pump
Features section
for more details.)
3—indoor
temperature sensor
CommentsOption Description Options Description
Defaults and
Options depend on
System Type
selection. Indoor
Temperature Sensor
uses an averaging
network and does
not include on-board
sensor.
When number 0210
is set to zero, this
item is automatically
selected to number
2 and not shown.
Heat Pump
Compressor
Lockout or
(Balance
Point)
Heat Pump
Auxiliary
Lockout
Indoor
Dehumidification Control
0350 0 No compressor
0360 0 No heat pump
0380 0 No indoor
lockout.
auxiliary lockout
dehumidification
control
15, 20, 25,
30, 35, 40,
45
40, 45, 50,
55, 60
1 1—dehumidi-
N o l o c k o u t .
°
F (-9.5°C )
15
°
20
F (-6.5°C )
°
25
F (-4°C )
°
30
F (-1°C )
°
35
F (1.5°C )
°
40
F (4.5°C )
°
45
F (7°C)
N o l o c k o u t .
°
F (4.5°C )
40
°
45
F (7°C )
°
50
F (10°C )
°
55
F (13°C )
°
60
F (15.5°C)
fication droop
control. (See
Advanced Features
section for more
information.)
Default depends on
other selections.
Shown if Outdoor
Temperature for
control is selected.
(See Advanced
Features section for
more information.)
Shown if electric is
chosen for backup
heat source and
outdoor temperature
sensor for
control is selected.
(See Advanced
Features section for
more information.)
Available on models
with humidity
sensor.
15 69-1706
Page 16
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Table 6. Advanced Settings Menu.
Select
Furnace Filter
Change
Reminder
Humidifier Pad
Replace-ment
Reminder
UV Lamp
Replace-ment
Reminder
Adaptive
Intelligent
Recovery™
Number of
Periods
Installer
Setup
Number
0500 0 Furnace filter change
0510 0 Humidifier pad
0520 0 UV Lamp
0530 1 Adaptive Intelligent
0540 4 Four periods
Factory Setting Other Choices
reminder off
replacement
reminder off
replacement
reminder off
Recovery™ control is
activated (system
starts early so
setpoint is reached
by start of program
period).
available (Wake,
Leave, Return,
Sleep)
1-6 1—10 run time
1-3 1—90 calendar
1 1—365 calendar
0 0—conventional
2Two periods
d a y s
2—30 run time
d a y s
3—60 run time
d a y s
4—90 run time
d a y s
5—120 run time
d a y s
6—365 run time
d a y s
d a y s
2—180 calendar
d a y s
3—365 calendar
d a y s
days
recovery (system
starts recovery at
programmed time)
available (Wake
and Sleep)
CommentsOption Description Options Description
Run time based on
call for fan.
—
—
—
Not shown if nonprogrammable is
selected. 2 or 4
applies to all days of
the week.
Minimum
Compressor
Off Time
Heat
Temperature
Range Stop
Cool
Temperature
Range Stop
Clock Format 0640 12 12-hour clock format 24 24-hour clock
Extended Fan
on time Heat
Extended Fan
on time Cool
69-1706 16
0580 5 Five minute minimum
0600 90 Highest heating
0610 50 Lowest cooling
0650 0 No extended fan
0660 0 No extended fan
off time for
compressor
setpoint.
setpoint.
operation after call
for heat ends
operation after call
for cool ends
0, 2, 3, 4 Minimum number
40 to 89 Temperature range
51 to 99 Temperature range
of minutes
compressor is off
between calls for
compressor
(1°F increments) of
heating setpoint.
(1°F increments) of
cooling setpoint.
format
90 Fan operation is
90 Fan operation is
extended 90
seconds after call
for heat ends.
extended 90
seconds after call
for cool ends.
—
Shown in 1/2 °C.
Shown in 1/2 °C.
—
Not shown if fan
operation is set to
fossil fuel or in Cool
Only Systems
Not shown in Heat
Only Systems.
Page 17
Select
Keypad
Lockout
Temperature
Control in Heat
Temperature
Control in Cool
Temperature
Display Offset
Reset
Thermostat
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Table 6. Advanced Settings Menu. (Continued)
Installer
Setup
Number
0670 0 Unlocked keypad 1, 2 1— p a r t i a l l y l o c k e d
0680 2 Standard
0690 2 Standard
0700 0 No difference in
0710 0 No thermostat reset. 1 Resets all Installer
Factory Setting Other Choices
k e y p a d
2—fully locked
keypad
temperature control
in heating
temperature control
in cooling
displayed
temperature and
actual room
temperature
1, 3 1—less aggressive
1, 3 1—less aggressive
-3, -2, -1,
0, 1, 2, 3
temperature
control (could
cause temperature
u n d e r s h o o t )
3—more
aggressive
temperature
control (could
cause temperature
overshoot)
temperature
control (could
cause temperature
u n d e r s h o o t )
3—more
aggressive
temperature
control (could
cause temperature
overshoot)
°
F (-1.5°C )
-3
- 2 ° F ( - 1 ° C )
- 1 ° F ( - . 5 ° C )
0 F ( 0 . ° C )
1 ° F ( . 5 ° C )
2 ° F ( 1 ° C )
3°F (1.5°C)
Setup Options to
default values and
resets schedule to
default setting.
CommentsOption Description Options Description
Unlocked—all
functions are
available.
Partially locked—
only temperature up
and down keys and
ability to enter and
modify Installer
Setup mode are
a va i l a b l e.
Fully locked—only
ability to enter and
modify Installer
Setup mode are
available.
Applies to recovery
ramp and use of
auxiliary heat during
recovery.
Choose 1 if getting
temperature
overshoot.
Choose 3 if getting
temperature
undershoot.
Applies to recovery
ramp.
Choose 1 if getting
temperature
overshoot.
Choose 3 if getting
temperature
undershoot.
—
Only calendar
settings and time are
retained.
17 69-1706
Page 18
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
SYSTEM CHECKOUT
Installer System Test
The Installer System Test mode is used to test the HVAC
system(s). See Table 7. While in System Test mode,
minimum off -time for compressors is bypassed.
The Installer Test is part of the Installer Setup options.
Entering the Installer Setup screen and pressing the
down arrow key to bring up the test selection(s) accesses
it quickly. See Fig. 22.
Table 7. System Test(s).
Select
Installer Test
Cool
Installer Test
Fan
Installer Test
Heat
Installer Test
Em Ht
Installer
Setup
Number
Test 1 0 Cool is off 1,2 0—cool off
Test 2 0 Fan is off 1 0— f a n o f f
Test 3 0 Heat is off 1-3 0— h e a t o f f
Test 4 0 Emergency heat is
Factory Setting Other Choices
off
CAUTION
Equipment Damage Hazard.
Minimum compressor off-time is bypassed
during Installer System Test.
Avoid cycling compressor quickly.
CommentsOptions Description Options Description
1—cool stage 1
tu rns on
2—cool stages 1
and 2 on
1—fan turns on
1—stage 1 heat
o n
2—stages 1 and
2 h e a t o n
3—stages 1, 2
and 3 (Aux Ht) on
1 0—emergency
heat off
1—emergency
heat on
System selection
determines which
tests are available
and the number of
stages shown.
Available only if
heat pump with
auxiliary heat is
selected.
69-1706 18
Page 19
ADVANCED FEATURES
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Outdoor or Indoor Temperature Sensor
Allow outdoor or indoor temperature sensor to absorb the
air for a minimum of five minutes before taking a reading.
See the Sensor instructions for more information.
Special Heat Pump Features
Heat Pump with Fossil Fuel Auxiliary Heat (Dual
Fuel) and Outdoor Temperature Sensor
In this operation, there is no external fossil fuel kit (dual
fuel kit) installed; the thermostat controls this function.
1. Choose correct heat pump application in Installer
Setup Number 0170.
2. Choose Fossil Fuel Option as the backup heat
source in Installer Setup Number 0200.
3. Choose No External Fossil Fuel Kit Option is
controlling back up heat in Installer Setup Number
0210.
4. Outdoor Temperature Sensor for Control
Option is automatically chosen in Installer Setup
Number 0340 (0340 is not shown).
5. Choose appropriate Balance Point Temperature
in Installer Setup Number 0350.
OPERATION IN HEAT MODE ABOVE BALANCE POINT
(OUTDOOR TEMPERATURE)
When the outdoor temperature is above the selected
Balance Point Temperature (ISU 0350), only the
compressor operates and the fan (G terminal) energizes
when the thermostat calls for heat.
OPERATION IN HEAT MODE BELOW BALANCE POINT
(OUTDOOR TEMPERATURE)
When the outdoor temperature is below the selected
Balance Point Temperature (ISU 0350), only the Fossil
Fuel (auxiliary heat) operates and the fan (G terminal)
does not energize when the thermostat calls for heat.
OPERATION IN EMERGENCY HEAT MODE
The balance point (outside) temperature is not used in
the Emergency heat mode. When the thermostat is
moved to the Emergency Heat position, the compressor
is locked out. The first stage of heat is whatever is
connected to the E terminal. The second stage of heat is
what is connected to the Aux. terminal. Often there is
only one source of non-compressor heat and the E
terminal is jumped to the Aux. terminal.
Heat Pump with Electric Auxiliary (Backup) Heat
and Outdoor Temperature Sensor
1. Choose correct heat pump application in Installer
Setup Number 0170.
2. Choose Electric as Auxiliary (Backup) Heat
Source in Installer Setup Number 0200.
3. Choose Outdoor Temperature Sensor for
Control Option in Installer Setup Number 0340.
4. Choose Compressor Lockout Temperature in
Installer Setup Number 0350.
5. Choose Auxiliary Lockout Temperature in
Installer Setup Number 0360.
NOTE: There is a 5°F deadband between the
Compressor and Auxiliary Heat Lockout
Temperatures
Operation in Heat Mode
When the outdoor temperature is below the Compressor
Lockout Temperature, only the Auxiliary Heat operates.
When the outdoor temperature is above the Auxiliary
Lockout Temperature, only the Compressor operates.
See Fig. 24.
COMPRESSOR ONLY
50
BOTH COMPRESSOR AND
AUXILIARY HEAT
35
OUTDOOR TEMPERATURE
Fig. 24. Heat Pump Operation with Lockout
When the outdoor temperature is between the two
temperatures, both the Compressor and Auxiliary Heat
operate.
AUXILIARY ONLY
Temperatures Set.
AUXILIARY
LOCKOUT
TEMPERATURE
COMPRESSOR
LOCKOUT
TEMPERATURE
M19950
Operation in the Emergency Heat Mode
Once the thermostat is placed into the Emergency Heat
mode, the compressor and auxiliary lockout features are
turned off. In the Emergency heat mode, the compressor
is locked out. The first stage of heat is whatever is
connected to the E terminal. The second stage of heat is
connected to the Aux. terminal. Usually the emergency
and auxiliary heat sources are electric strip heat in these
cases.
Dehumidification Droop Control
The dehumidification control attempts to control to the
user's humidity setpoint by turning on the air conditioner.
In extremely high humidity conditions, the thermostat
keeps the air conditioner running for up to 3
temperature setpoint. It does this while trying to achieve
the desired humidity setpoint and balancing that with the
temperature setpoint.
°
F below the
19 69-1706
Page 20
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
TROUBLESHOOTING (SEE TABLE 8)
Table 8. Troubleshooting.
Symptom Possible Cause Action
Display does not come on. Thermostat is not being
Temperature settings do not
change.
powered.
The upper or lower temperature
limits were reached.
The keypad is fully locked. Check Installer Setup Number 0670 to
Heating or cooling does not come
on.
Thermostat is calling for Heat
(Heat on) or Cool (Cool on) but no
heating or cooling is running.
Thermostat does not respond
when touch areas are pressed.
Thermostat minimum off-time is
activated.
System selection is not set to
Heat or Cool.
O/B terminal is not set correctly
(Heat Pumps only).
System type Selection is
incorrect.
Heating or cooling equipment is
not operating.
The keypad is locked. Check Installer Setup Number 0670 to
Check for 24 Vac between C and Rc.
Check that AAA batteries are installed
correctly and are good.
Check temperature setpoints.
Check Installer Setup Numbers 0600 and
0610; modify as needed.
change keypad locked options.
Wait up to five minutes for the system to
respond.
Set system Selection to correct position.
Check Installer Setup Number 0190 and
set correctly.
Check Installer Setup Number 0170 and
make sure correct System type is
chosen.
Check wiring.
Check Installer Setup Number 0170 and
make sure correct system type is chosen.
Verify operation of equipment in System
Test mode.
change keypad locked options.
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
69-1706 G.H. 01-04 www.honeywell.com/yourhome
M1V 4Z9
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