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— answers from the official manualAnswers from the official manual.
Common questions
Common Questions
7 totalHow do I remove an outdoor temperature sensor that's not needed?
Disconnect the optional outdoor or indoor remote sensor wire from the terminal block, ensuring it does not interfere with system operation (page 14).
How do I change day and month settings in my Th8320u?
Use arrow keys to select and update the current date. For year and time adjustments, utilize the same interface on screen during setup (page 17).
How do I set up basic installation for the Th8320u?
To begin installation, follow steps in the Installer Setup section. This includes setting system parameters such as thermostat type and relay configurations (page 16).
How do I set up outdoor temperature sensing?
Ensure the outdoor sensor is connected and required if using fossil fuel backup heat without an external kit. Connect according to system design in Installer Setup (page 14).
What should I do when my Th8320u displays 'F' error?
'F' indicates a fan control issue. Check that connections to the fan relay are secure and correct terminal labels match system design (page 7).
How do I set up auxiliary heat lockout temperatures?
Adjust the Aux Lockout Temp for either Auxiliary Heat Only or Both Compressor & Auxiliary depending on your installation needs in the setup menu (page 20).
Show 1 more questions
Full Manual
20 pages
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NO
YES
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NO
5 FEET [1.5 METERS]
NO
M19925
69-1706
HEAT PUMP
CONVENTIONAL
RC R W Y G C
RC R O/B Y G C
Y2
Y2
E AUX
W2
SCREW TERMINALS
M19951
MOUNTING
MOUNTING
M19916
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M19917
CONVENTIONAL
Y2 RC
2
W
R C
W2 Y G C
R
OPTIONAL 24 VAC
COMMON CONNECTION
FAN RELAY
OUTDOOR/INDOOR TEMPERATURE SENSOR
COMPRESSOR CONTACTOR
HEAT RELAY
1
3
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.
M19895
CONVENTIONAL
Y2 RC
2
W
R C
W2 Y G C
R
OPTIONAL 24 VAC
COMMON CONNECTION
HEAT RELAY
OUTDOOR/INDOOR TEMPERATURE SENSOR
1
3
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.
M19897
CONVENTIONAL
Y2 RC
2
W
R C
W2 Y G C
R
OPTIONAL 24 VAC
COMMON CONNECTION
FAN RELAY
OUTDOOR/INDOOR TEMPERATURE SENSOR
COMPRESSOR CONTACTOR
1
C R
HEAT RELAY
1
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE FACTORY INSTALLED JUMPER. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
M19896
CONVENTIONAL
Y2 RC
2
W
R C
W2 Y G C
R
OPTIONAL 24 VAC
COMMON CONNECTION
FAN RELAY
OUTDOOR/INDOOR TEMPERATURE
SENSOR HEAT RELAY
1
3
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.
M19898
CONVENTIONAL
Y2 RC
2
1
W
R
W2 Y G C
C
R
OUTDOOR/INDOOR TEMPERATURE SENSOR
W BR
SERIES 20 MOTOR OR VALVE
TR
TR
3
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.
M19899
CONVENTIONAL
Y2 RC
2
W
R C
W2 Y G C
R
OPTIONAL 24 VAC
COMMON CONNECTION
FAN RELAY
OUTDOOR/INDOOR TEMPERATURE SENSOR
COMPRESSOR CONTACTOR
1
3
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.
M19900
CONVENTIONAL
RC R W Y G C
Y2
2
W2 S2 S1
OPTIONAL 24 VAC COMMON CONNECTION MUST COME FROM THE COOLING TRANSFORMER.
|OUTDOOR/INDOOR TEMPERATURE SENSOR| | |---|---| |OUTDOOR/INDOOR TEMPERATURE SENSOR| |
FAN RELAY
|COOL RELAY 1| |---|
COOL RELAY 2
HEAT RELAY 2
HEAT RELAY 1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.1
FACTORY INSTALLED JUMPER. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
1
R C
M19901
CONVENTIONAL
1
R C
RC R W Y G C
Y2
2
W2 S2 S1
OPTIONAL 24 VAC COMMON CONNECTION MUST COME FROM THE COOLING TRANSFORMER.
|OUTDOOR/INDOOR TEMPERATURE SENSOR| |---|
FAN RELAY
3
1
R C
COOL RELAY 2 COOL RELAY 1
HEAT RELAY 2
HEAT RELAY 1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.1
FACTORY INSTALLED JUMPER REMOVED. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABL SEPARATE FROM THE THERMOSTAT CABLE.
M19902
HEAT PUMP
R C
Y2 L E AUX SI S2
RC
R O/B Y G C
3
OPTIONAL 24 VAC COMMON CONNECTION
FAN RELAY
OUTDOOR/INDOOR TEMPERATURE SENSOR
4
CHANGEOVER VALVE
COMPRESSOR
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY INSTALLED JUMPER. "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
M19903
HEAT PUMP
R C
Y2 L E AUX SI S2
RC
R O/B Y G C
3
4
OPTIONAL 24 VAC COMMON CONNECTION
FAN RELAY
OUTDOOR/INDOOR TEMPERATURE SENSOR
5
CHANGEOVER VALVE
|COMPRESSOR 2| |---|
COMPRESSOR 1
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY INSTALLED JUMPER. MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE USED AS 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. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
M19904
EQUIPMENT MONITOR
HEAT PUMP
Y2 L E AUX SI S2
R O/B Y G C
6
OPTIONAL 24 VAC COMMON CONNECTION
FAN RELAY
3
OUTDOOR/INDOOR TEMPERATURE SENSOR
CHANGEOVER VALVE
COMPRESSOR RELAY
EMERGENCY HEAT RELAY
HEAT 2 RELAY (AUXILIARY HEAT)
R C
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY INSTALLED JUMPER. OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE 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 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.
M19905
EQUIPMENT MONITOR
HEAT PUMP
R C
Y2 L E AUX SI S2
R O/B Y G C
5
6
OPTIONAL 24 VAC COMMON CONNECTION
FAN RELAY
3
OUTDOOR/INDOOR TEMPERATURE SENSOR
4
CHANGEOVER VALVE
HEAT 2 RELAY (AUXILIARY HEAT)
EMERGENCY HEAT RELAY
COMPRESSOR 2 COMPRESSOR 1
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY INSTALLED JUMPER. OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE 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 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.
M19906
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BATTERIES (3)
M19918
WALL
#### M19919
SET CURRENT DAY SET MONTH
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TUE WED FRI
D
DONE
USE ARROWS TO SET YEAR AND TIME
WED
W
OK TO PICK MULTIPLE DAYS SCREEN LOCKED
U
R
DONE
M19921
REMOVE TAB TO ACTIVATE REAL TIME CLOCK
REMOVE DURING
INSTALLATION
REMOVE DURING
INSTALLATION
M19920
TO CC
EQUIPMENT MONITOR
L TO R
M19907
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TUE
Inside Set To
Following Schedule
SYSTEM EM HEAT
OFF COOL
PM
DONE CANCEL
##### M19923
ADVANCE TO NEXT INSTALLER SETUP
INSTALLER SETUP NUMBER FACTORY
SETTING
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SA
A
DONEO
CHANGE THE FACTORY SETTING M19922
PRESS TO EXIT INSTALLER SETUP
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OUTDOOR TEMPERATURE
COMPRESSOR ONLY
AUXILIARY LOCKOUT TEMPERATURE
50
BOTH COMPRESSOR AND AUXILIARY HEAT
COMPRESSOR LOCKOUT TEMPERATURE
35
AUXILIARY ONLY
M19950
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