Honeywell TH8321 User Manual

VISIONPRO® 8000 SMART THERMOSTAT
85 33-00096—04
Wiring with the THP9045 C-Wire Adapter
The THP9045 C-wire adapter is designed to be used with applicable thermostats in which a 24V common is required and
there are not enough wires. The K terminal on the thermostat can be used to operate both the fan and compressor on a
single wire, and the module is designed to receive the signal from the K terminal, split that signal and re-route it to operate
the compressor and/or fan for normal operation. See form 33-00342 for additional information.
Fig. 223. Example C-wire adapter wiring diagram for a conventional application.
Fig. 224. Example C-wire adapter wiring diagram for a heat pump application.
THERMOSTAT
EQUIPMENT
CWIRE
ADAPTOR
W C
K R
FURNACE
R C W Y G
R
C
W
Y
G
R C
TH8321WF SUBBASE
CONVENTIONAL
HEAT PUMP
M37962
C
K
Rc
R
U1
U1
U2
U2
S1
S1
W
Y
G
S1
S1
O/B
Y
G
E
W2
Y2
A
AUX
Y2
LA
THERMOSTAT
EQUIPMENT
CWIRE
ADAPTOR
W C
K R
AIR HANDLER
R C O Y G
R
C
W
Y
G
Y2 AUX
TH8321WF SUBBASE
CONVENTIONAL
HEAT PUMP
M37963
C
K
Rc
R
U1
U1
U2
U2
S1
S1
W
Y
G
S1
S1
O/B
Y
G
E
W2
Y2
A
AUX
Y2
LA
MATCH THE WIRES FROM THE HEAT PUMP TO THE AIR HANDLER AS NORMAL.
ON SOME HEAT PUMPS, THE REVERSING VALVE IS LABELED B INSTEAD OF O.
1
2
1
2

Honeywell TH8321 Specifications

General

Brand	Honeywell
Model	TH8321
Category	Thermostat
Language	English