Powering The Thermostat; Mounting The Thermostat - Honeywell TH8320U Installation Instructions Manual
Touch screen programmable thermostats
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Also See for TH8320U:
- Operating manual (96 pages) ,
- Installation manual (13 pages) ,
- Operating manual (32 pages)
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5 5
3
4
HEAT 2 RELAY
(AUXILIARY HEAT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3
OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT.
4
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
5
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.
6
"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
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.
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.
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
HEAT PUMP
Y2
L
E
AUX
SI
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
EMERGENCY
HEAT RELAY
2
R
O/B
6 6
Y
G
C
COMMON CONNECTION
CHANGEOVER
VALVE
COMPRESSOR 2
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
EQUIPMENT
MONITOR
OPTIONAL 24 VAC
FAN RELAY
COMPRESSOR 1
M19906
BATTERIES (3)
1
R
C
M19918
69-1706
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