Honeywell TH8320U Installation Instructions Manual page 4

TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Y2 RC
W2
S1
S2
3
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
Fig. 9. Typical hookup of heat only Series 20 system.
OUTDOOR/INDOOR
TEMPERATURE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
3 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST
HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 11. Typical hookup of conventional multistage two-stage heating and two-stage cooling
in a single transformer system (2H/2C or 2H/1C or 1H/2C conventional).
69-1706
CONVENTIONAL
2
R
W
Y
G
C
W B R
SERIES 20
MOTOR OR
TR TR
VALVE
CONVENTIONAL
Y2
W2
S1
S2
SENSOR
HEAT RELAY 2
Y2
1
R
W2
C
S1
S2
3
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FACTORY INSTALLED JUMPER.
3 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE
ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
M19899
Fig. 10. Typical hookup of cool only system
RC
2
R
W
Y
G
C
COOL RELAY 2 COOL RELAY 1
HEAT RELAY 1
4
CONVENTIONAL
RC
2
R
W
Y
G
C
CONNECTION
FAN
RELAY
COMPRESSOR
CONTACTOR
(1C conventional).
OPTIONAL 24 VAC
COMMON CONNECTION
MUST COME FROM
THE COOLING
TRANSFORMER.
FAN RELAY
1
R
C
OPTIONAL
24 VAC
COMMON
M19900
1
R
C
M19901