Honeywell TH8320R1003 Installation Manual page 121

Typical wiring of a heat pump system with up to four-stage heat and two-stage cool with one transformer.
2
1 See guides on following pages for geothermal radiant heat wiring.
2 Wire a maximum of 4 sensors using the S1-S4 terminals. S1-S4 terminals can be connected to an indoor sensor, outdoor sensor,
discharge sensor, return sensor, dry contact device to display an alert or an occupancy sensor for remote setback..
3 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 132.
4 Connect wireless adapter to ABCD for extended wireless range.
EIM
POWER
HEAT
COOL
STATUS
FAN
LEDS
U1
U2
U3
A
B
4
C
D
S4
CONNECT OPTIONAL
S4
SENSORS TO
S3 AND S4 TERMINALS
S3
S3
Fig. 315. EIM wiring guide — heat pump systems.
TO THERMOSTAT
O/B
HEAT PUMP
O/B
AUX1
AUX1
AUX2
AUX2
Y
L/A
Y2
3
G
L/A
3
1
R
C
CONNECT OPTIONAL
SENSORS
S1 AND S2 TERMINALS
2
121
®
VISIONPRO 8000 WITH REDLINK™
CHANGEOVER VALVE
BACKUP HEAT
STAGE 1
BACKUP HEAT
STAGE 2
COMPRESSOR
STAGE 1
COMPRESSOR
STAGE 2
FAN RELAY
COMPRESSOR
MONITOR OR
ZONE PANEL
JUMPERS
AIR HANDLER
TRANSFORMER
24 120
VAC VAC
SENSORS TO
68-0312—03