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This manual covers the following models

  • TH8110U: For 1 Heat/1 Cool systems
  • TH8320U: For up to 3 Heat/2 Cool systems
  • TH8321U: For up to 3 Heat/2 Cool systems with dehumidification
    (Pull thermostat from wallplate and turn over to find model number)

System Types 

  • Gas, oil, or electric heat with air conditioning
  • Warm air, hot water,  highefficiency furnaces, heat pumps, steam, gravity
  • Heat only — two-wire systems, power to open and close zone valves (Series 20), and normally open zone valves
  • Heat only with fan
  • Cool only
  • 750 mV heating systems

This thermostat contains a Lithium battery which may contain Perchlorate material. Perchlorate Material—special handling may apply,
See www.dtsc.ca.gov/hazardouswaste/perchlorate

Wallplate installation 

  1. Separate wallplate from thermostat.
    Installation Instruction
  2. Mount wallplate as shown below.
    Installation Instruction

Must be installed by a trained, experienced technician 

  • Read these instructions carefully. Failure to follow these instructions can damage the product or cause a hazardous condition.
Warning Icon

CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before beginning installation

Warning Icon

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.

Power options 

Power Option

Wiring

Wiring Instruction

Terminal Designations Shaded areas below apply only to TH8320/TH8321.

Conventional Terminal Letters: 

  • R Heating power. Connect to secondary side of heating system transformer.
  • Rc Cooling power. Connect to secondary side of cooling system transformer.
  • C Common wire from secondary side of cooling transformer (if 2 transformers).
  • W 1st stage heat relay.
  • W2 2nd stage heat relay.
  • Y 1st stage compressor contactor.
  • Y2 2nd stage compressor contactor.
  • G Fan relay.
  • S1 Optional outdoor or remote sensor.
  • S2 Optional outdoor or remote sensor

Heat Pump Terminal Letters: 

  • R Heating power. Connect to secondary side of heating system transformer.
  • Rc Cooling power. Connect to secondary side of cooling system transformer.
  • C Common wire from secondary side of cooling system transformer.
  • Y 1st stage compressor contactor.
  • Y2 2nd stage compressor contactor.
  • Aux/E Auxiliary/Emergency heat relay.
  • G Fan relay.
  • L Heat pump reset (powered continuously when System is set to Em Heat; system monitor when set to Heat, Cool or Off).
  • O/B Changeover valve for heat pumps.
  • S1 Optional outdoor or remote sensor.
  • S2 Optional outdoor or remote sensor.

Wiring guide—conventional systems 

Shaded areas below apply only to TH8320/TH8321.

1H/ 1C System (1 transformer)1H/1C System (2 transformers)
RcPower [1]RcPower (cooling transformer) [1, 2]
R[R+Rc joined by jumper]WPower (heating transformer) [1, 2]
WHeat relayYCompressor contactor
YCompressor contactorGFan relay
GFan relayC24VAC common [3, 4]
S1Optional outdoor/remote sensorS1Optional outdoor/remote sensor
S2Optional outdoor/remote sensorS2Optional outdoor/remote sensor
Heat Only System
Rc3Power [1]
R [R+Pc joined by jumper]
WHeat relay
C 24VAC common [3]
 Si Optional outdoor/remote sensor
 S2 Optional outdoor/remote sensor
Heat Only System With Fan
RcPower [1]
R[R+Pc joined by jumper]
WHeat relay
GFan relay
C24VAC common [3]
SiOptional outdoor/remote sensor
S2Optional outdoor/remote sensor
Heat Only System (Series 20)
 Rc 1 [R+Pc joined by jumper]
  R Series 20 valve terminal “R” [1]
W Series 20 valve terminal “B”
Y Series 20 valve terminal “W”
C 24VAC common [3]
SiOptional outdoor/remote sensor
S2Optional outdoor/remote sensor
Cool Only System
Rc1 Power [1]
R[R+Rc joined by jumper]
YCompressor contactor
G Fan relay
C24VAC common [3]
SiOptional outdoor/remote sensor
S2Optional outdoor/remote sensor
2H/2C System (1 transformer)
Y2Cool relay 2
W2Heat relay 2
Rc3 Power [1]
R[R+Rc joined by jumper]
WHeat relay 1
YCool. relay 1
GFan relay
C24VAC common [3]
SiOptional outdoor/remote sensor
S2Optional outdoor/remote sensor
2H/2C System (2 transformers)
Y2Cool relay 2
W2Heat relay 2
RcPower (cooling transformer) [1, 2]
RPower (heating transformer) [1, 2]
WHeat relay 1
YCool relay 1
GFan relay
C24VAC common [3, 4]
S1Optional outdoor/remote sensor
S2Optional outdoor/remote sensor

See [notes] below

  1. Power supply. Provide disconnect means and overload protection as required.
  2. Remove jumper for 2-transformer systems.
  3. Optional 24VAC common connection.
  4. Common connection must come from cooling transformer.

Wiring guide—heat pump systems 

Shaded areas below apply only to TH8320/TH8321.

1H/1C Heat Pump (no auxiliary heat)
RcPower [1]
R[R+Rc joined by jumper]
O/BChangeover valve [5]
YCompressor relay
GFan relay
C24VAC common [3]
S1Optional outdoor/remote sensor
S2Optional outdoor/remote sensor
2H/2C Heat Pump (no auxiliary heat)
Y2Compressor 2 relay
RcPower [1]
R[R+Rc joined by jumper]
O/BChangeover valve [5]
YCompressor 1 relay
GFan relay
C24VAC common [3]
S1Optional outdoor/remote sensor
S2Optional outdoor/remote sensor
2H/1C Heat Pump (with auxiliary heat)
LEquipment monitor [6, 7]
Aux/EAuxiliary/Emergency heat relay (Heat 2)
RcPower [1]
R[R+Rc joined by jumper]
O/BChangeover valve [5]
YCompressor relay
GFan relay
C24VAC common [3]
S1Optional outdoor/remote sensor
S2Optional outdoor/remote sensor
3H/2C Heat Pump (with auxiliary heat)
Y2Compressor 2 relay
LEquipment monitor [6, 7]
Aux/EAuxiliary/Emergency heat relay (Heat 2)
RcPower [1]
R[R+Rc joined by jumper]
O/BChangeover valve [5]
YCompressor 1 relay
GFan relay
C24VAC common [3]
S1Optional outdoor/remote sensor
S2Optional outdoor/remote sensor

See [notes] below

  • Power supply. Provide disconnect means and overload protection as required.
  • Optional 24VAC common connection.
  • O/B set to control as either O or B in installer setup.
  • If L terminal is used, 24VAC common (terminal C) must be connected.
  • Heat pump reset (powered continuously when thermostat is set to Em. Heat; system monitor when set to Heat, Cool, or Off).

Remove tab and mount thermostat 

Mounting Instruction

Align pins on back of thermostat with slots in wallplate, then push gently until thermostat snaps into place.

Set date and time 

Set date and time

Installer setup

  1. Installation Instruction
  2. Installation Instruction
  3. Installation Instruction
    Installation Instruction

Setup function

Settings & Options (factory default inbold)

Shaded areas below apply only to TH8320/TH8321.

0120Year
(first two digits)
20 (2001-2099)21 (2100-2178)
0130Year
(second two digits)
12 (2012)
[Other options: 00-99]
0140Month6  [Other options: 1-12]
0150Date15 [Other options: 1-31]
0160Schedule format4   7-day programming
0 Non-programmable
0170System type1 heat/1 cool conventional1 heat/1 cool heat pump (no aux. heat)Heat only (2-wire systems)Heat only with fanHot water Series 20 system (power to open & close zone valves/normally open zone valves)Cool only2 heat/1 cool heat pump (with aux. heat)2 heat/2 cool multistage conventional2 heat/1 cool multistage conventional1 heat/2 cool multistage conventional2 heat/2 cool heat pump (no aux. heat)3 heat/2 cool heat pump (with aux. heat)
0180Fan control (heating)0     Gas/Oil heat (equipment controls heating fan)
1    Electric furnace (thermostat controls heating fan)
0190Changeover valve (O/B terminal)0 O/B terminal controls valve in cooling
1
 O/B terminal controls valve in heating
0200Auxiliary heatElectric backup heat
1 Fossil fuel backup heat
0210External fossil fuel kit1 External fossil fuel kit controls backup heat
0
 Thermostat controls backup heat (outdoor sensor re- quired)
02201st stage com- pressor cycle rate3 Recommended for most compressors
[Other options: 1, 2, 4, 5 or 6 CPH]
02302nd stage com- pressor cycle rate3 Recommended for most compressors
[Other options: 1, 2, 4, 5 or 6 CPH]
0240First stage heat cycle rate (CPH= cycles per hour)5 Gas or oil furnaces of less than 90% efficiency
1 Steam or gravity systems
3 Hot water systems & furnaces of 90%+ efficiency
9 Electric furnaces
[Other options: 2, 4, 6, 7, 8, 10, 11, 12 CPH]
0250Second stage heat cycle rate (CPH)5 Gas or oil furnaces of less than 90% efficiency
1 Steam or gravity systems
3 Hot water systems & furnaces of 90%+ efficiency
9 Electric furnaces
[Other options: 2, 4, 6, 7, 8, 10, 11, 12 CPH]
0260Third stage heat cycle rate (CPH)9 Electric auxiliary heat or electric furnaces
1 Steam or gravity systems
3 Hot water systems & furnaces of 90%+ efficiency
5 Gas or oil furnaces of less than 90% efficiency [Other options: 2, 4, 6, 7, 8, 10, 11, 12 CPH]
0280BacklightBacklight on for approx. 8 seconds after keypress
1 Backlight always on low intensity, full bright after key- press (requires 24VAC connection)
0300Manual/Auto changeover0 Manual changeover (Heat/Cool/Off)
1 Automatic changeover (Heat/Cool/Auto/Off)
0310Auto changeover deadband3 Heat/cool temperature 3°F apart (1.5°C) 1
[Other options: 2-9 (2°F to 9°F/1.5 °C to 5°C)]
0320Temperature display0 Fahrenheit
1 Celsius
0330Daylight savings2 Auto-change to daylight savings time (2007 and be- yond, for areas that use the new 2007 DST calendar)
1 Auto-change to daylight savings time (through 2006, and for areas that do not use the new 2007 DST calendar)
0 Daylight savings time is turned off
0340Remote sensorNo remote sensor
1 Outdoor sensor (display only)
2 Outdoor control sensor (select heat pumps)
3 Indoor sensor
0350Heat pump compressor lockout0 No heat pump compressor lockout
[Other options: 15, 20, 25, 30, 35, 40°F (-9.5°C to 7°C)]
0360Heat pump auxiliary lockout0 No heat pump auxiliary lockout
[Other options: 40, 45, 50, 55, 60°F (4.5°C to 15.5°C)]
0380Dehumidification controlNo dehumidification control
1 Thermostat controls dehumidification with air conditioner

Settings & Options (factory default in bold)

0500Furnace filter change reminder0    Off
1    10-day run time (about 1 month)
2    30-day run time (about 3 months)
3    60-day run time (about 6 months)
4    90-day run time (about 9 months)
5    120-day run time (about 1 year)
6    365-day run time (about 3 years)
0510Humidifier pad change
reminder
0    Off
1    90 calendar days
2    180 calendar days
3    365 calendar days
0520UV lamp change reminder0    Off
1    365 calendar days
0530Adaptive Intelligent Recovery™1   On
0   Off
0540Program periods4  4 program periods (Wake, Leave, Return, Sleep)
2  2 program periods (Wake, Sleep)
0580Compressor protection5    5 minute compressor off time
[Other options: 0, 1, 2, 3 or 4-minute off time]
0600Heat temperature range stop90  Max. heat temperature setting is 90°F (32°C)
[Other options: 40-89°F (4.5°C to 32°C)]
0610Cool temperature range stop50  Min. cool temperature setting is 50°F (10°C)
[Other options: 51-99°F (10.5°C to 37°C)]
0640Clock format12 12-hour time (i.e., “3:30 pm”)
24 24-hour time (i.e., “15:30”)
0650Extended fan timer (heat)0   Off
90 Fan runs for 90 seconds after call for heat ends
0660Extended fan timer (cool)0   Off
90 Fan runs for 90 seconds after call for cooling ends
0670Keypad lock0     Keypad unlocked (fully functional)
1    Partially locked (access to temperature settings only)
2    Fully locked
0680Heat temperature control2   Standard temperature control (recommended)
1 Choose if room is warmer than set temperature
3 Choose if room does not reach set temperature
0690Cool temperature control2   Standard temperature control (recommended)
1 Choose if room is cooler than set temperature
3 Choose if room does not reach set temperature
0700Temperature display offset0 Thermostat displays actual room temperature
[Other options: -3, -2, -1, 1, 2, 3°F offset (-1.5°C to 1.5°C)
0710RESET0     No reset
1    Reset installer options & program schedule to factory default (only date and time settings are retained)

Installer system test

Installation Instruction

Shaded areas below apply only to TH8320/TH8321.

System testSystem status
1 Cooling system0 Compressor and fan turn off
1 Compressor and fan turn on
2 Second stage compressor turns on
2 Fan system0 Fan turns off
1 Fan turns on
3 Heating system0 Heat and fan turn off
1 Heat turns on (fan on if Function 0170 is set for heat pump, or if Function 0180 is set to “1”)
2 Second stage heat turns on
3 Third stage heat turns on
4 Emergency
 heating system
0 Heat and fan turn off
1 Heat and fan turn on
Warning Icon

CAUTION: EQUIPMENT DAMAGE HAZARD. Compressor protection is bypassed during testing. To prevent equipment damage, avoid cycling the compressor quickly

Special functions

Shaded areas below apply only to TH8320/TH8321.

Auto Changeover (Setup Function 0300): When set to Auto, the thermostat automatically selects heating or cooling depending on the indoor temperature. Heat and cool settings must be at least 2 degrees apart. If function 0380 is set to On, the heat and cool settings must be at least 5 degrees apart.

Remote Sensor (Setup Function 0340): If an optional outdoor sensor is installed, the thermostat can display the outside temperature. If an optional remote indoor sensor is installed, the thermostat will display the temperature at the sensor location (the internal sensor in the thermostat is not used).

Adaptive Intelligent Recovery (Setup Function 0530): Allows the thermostat to “learn” how long the furnace and air conditioner take to reach programmed temperature settings, so the temperature is reached at the scheduled time.

Compressor Protection (Setup Function 0580): Forces the compressor to wait a few minutes before restarting, to prevent damage. During this time, the message “Wait” flashes on the display.

Dehumidification control (Setup Function 0380): TH8321 models monitor the indoor humidity level and automatically activate the cooling system to reduce humidity by lowering the temperature by up to 3 degrees below the current cool setting.

Heat Pump Temperature Lockout (with fossil-fuel backup): If the thermostat is installed with an optional outdoor sensor, you can select a compressor lockout temperature (Function 0350). When the outdoor temperature is below the lockout temperature, only the auxiliary heat operates. When the outdoor temperature is above the lockout temperature, only the compressor operates.

Heat Pump Temperature Lockouts (with electric heat backup): If the thermostat is installed with an optional outdoor sensor, you can select a compressor lockout temperature (Function 0350) and/or an auxiliary heat lockout temperature (Function 0360). 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. If the outdoor temperature is between the compressor and auxiliary lockout temperatures, both the compressor and auxiliary heat can operate.

Accessories & replacement parts

Please contact your distributor to order replacement parts.
Outdoor temperature sensor.………………………………Part Number C7089U1006
Remote indoor temperature sensor…………………….Part Number C7189U1005
Cover plate*…………………………………………………………..Part Number 32003796-001
*(Use to cover marks left by old thermostats.)

Specifications

Temperature Ranges

  • Heat: 40° to 90°F (4.5° to 32°C)
  • Cool: 50° to 99°F (10° to 37°C)

Operating Ambient Temperature

  • 0° to 120°F (-18° to 48.9°C)

Shipping Temperature 

  • -30° to 150°F (-34° to 66°C)

Operating Relative Humidity 

  • 5% to 90% (non-condensing)

Physical Dimensions 

  • 4-9/16” H x 6” W x 1-3/8” D
  • 116 mm H x 152 mm W x 35 mm D

Electrical Ratings 

Terminal currentVoltage (50/60Hz)Running
Heating20-30 Vac0.02-1.0 A
(Powerpile)750 mV DC100 mA DC
W2 Heating20-30 Vac0.02-0.6 A
Cooling20-30 Vac0.02-1.0 A
Y2 Cooling20-30 Vac0.02-0.6 A
Aux/E Aux. Heat Emergency heat20-30 Vac0.02-1.0 A 
O/B Changeover20-30 Vac0.02-0.6 A
Heat pump reset20-30 Vac0.02-0.6 A

Need Help?

For assistance with this product please visit http://customer.resideo.com
or call Resideo Customer Care toll-free at 1-800-468-1502

Logo

Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
69-2693—03 M.S. Rev. 07-21 | Printed in United States

http://www.resideo.com/

Documents / Resources

Honeywell TH8000 Series Touch-screen Programmable Thermostat [pdf] Installation Guide
TH8000 Series, Touch-screen Programmable Thermostat

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