Thx9321 Thermostat Wiring Diagrams - Honeywell THX9321 Prestige 2.0 Product Data

THX9321 Thermostat Wiring Diagrams

Typical wiring of a 3-heat / 2-cool heat pump system with one
transformer.
Transformer
120
VAC
O/B CHANGEOVER VALVE
AUX/E
BACKUP HEAT
Y
COMPRESSOR STAGE 1
Y2 COMPRESSOR STAGE 2
G FAN RELAY
L/A COMPRESSOR MONITOR
OR ZONE PANEL
K
6
Fig. 322. Prestige THX9321 and heat pump system with
one transformer.
Typical wiring of a 2-heat / 2-cool conventional system with one
transformer.
Transformer
120
VAC
W HEAT STAGE 1
W2
HEAT STAGE 2
Y
COMPRESSOR STAGE 1
Y2 COMPRESSOR STAGE 2
G FAN RELAY
A
K
6
Fig. 323. Prestige THX9321 and 2-heat / 2-cool
conventional system with one transformer.
1 U1 and U2 terminals are dry contacts.
2 L/A terminal sends continuous output when thermostat is set to EM HEAT mode except when set up for Economizer or TOD.
See "Economizer Module Wiring Diagrams" beginning on page 151.
3 U1 or U2 terminals must be used for geothermal radiant heat (ISU 2010). Thermostat allows 2 stages of radiant heat—geother-
mal (stage 1) and boiler (stage 2).
4 "U" terminals are normally open dry contacts when set up for geothermal radiant heat. You must install a field jumper if radiant
heat is powered by system transformer. Do NOT install a field jumper if radiant heat has its own transformer.
5 Remove jumper if using separate transformers.
6 Connect the THP9045 Wiresaver Module to the K terminal in heating/cooling applications that do not have a common wire at the
thermostat. The K terminal cannot be used in heat-only applications. See THP9045 installation instructions for more information.
NOTE: For setup and operation, see "Geothermal Radiant Heat" beginning on page 100.
24
C
VAC
R
C
Rc
R
U1
U1
1
U2
2
U2
M32948A
24
C
VAC
R
C
Rc
R
5
U1
U1
1
U2
U2
M32949A
®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
Typical wiring of a 3-heat / 2-cool heat pump system with two
transformers.
Air Handler
Transformer
O/B
CHANGEOVER VALVE
AUX/E
Y COMPRESSOR STAGE 1
Y2 COMPRESSOR STAGE 2
G
COMPRESSOR MONITOR
L/A
2
K
6
Backup Heat
Transformer
Fig. 324. Prestige THX9321 and heat pump system with
Typical wiring for geothermal radiant heat, geothermal forced-
air and backup heat with one transformer. See "Geothermal
Radiant Heat" on page 100.
Transformer
O/B CHANGEOVER VALVE
AUX/E
Y COMPRESSOR STAGE 1
Y2 COMPRESSOR STAGE 2
G
L/A COMPRESSOR MONITOR
K
6
Fig. 325. Prestige THX9321 and geothermal radiant heat,
geothermal forced-air and backup heat with one
141
120
24 C
VAC
VAC
R
1 3
FAN RELAY
OR ZONE PANEL
BACKUP HEAT
120 24
R
VAC
VAC
C
two transformers.
120 24
C
VAC
VAC
R
BACKUP HEAT
4
GEOTHERMAL
RADIANT
FAN RELAY
HEAT
STAGE 1
OR ZONE PANEL
2 3
transformer.
®
IAQ WITH EIM
C
Rc
R
U1
U1
1
U2
U2
M32950A
C
Rc
R
U1
U1
U2
U2
M32951A
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