Honeywell TH8321U Thermostat User Manual


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VisionPRO
TM
TH8000 Series
3
69-2693—01
ENGLISH
NOT
USED
MCR29483
NOT
USED
MCR29482
For24VACprimarypower,connectcommon
sideoftransformerto“C”terminal.
Insert supplied batteries for
primary or backup power.
Power options
Push excess wire back into the wall opening. Plug
wall opening with non-flammable insulation.
Remove factory-installed jumper
only for two-transformer systems.
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.
Terminal Designations Shaded areas below apply only to TH8320/TH8321.
Wiring
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