Honeywell TH8320U Installation Instructions Manual page 5

3
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER REMOVED.
3 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABL
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 12. Typical hookup of conventional multistage two-stage heating and two-stage cooling
in a two-transformer system (2H/2C or 2H/1C or 1H/2C conventional).
Y2
L
E
AUX
SI
S2
OUTDOOR/INDOOR
4
TEMPERATURE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3 "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
4 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
Fig. 13. Typical hookup of single-stage heat pump with no auxiliary/backup heat (1H/1C heat pump).
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
CONVENTIONAL
Y2
W2
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
HEAT RELAY 2
HEAT PUMP
SENSOR
RC
2
R
W
Y
G
C
COOL RELAY 2 COOL RELAY 1
HEAT RELAY 1
RC
2
R
O/B
3 3
Y
G
C
OPTIONAL 24 VAC
COMMON CONNECTION
CHANGEOVER
VALVE
5
OPTIONAL 24 VAC
COMMON CONNECTION
MUST COME FROM
THE COOLING
TRANSFORMER.
FAN RELAY
FAN RELAY
COMPRESSOR
1
R
C
1
R
C
M19902
1
R
C
M19903
69-1706