Honeywell THX9321 Prestige 2.0 System Installation Manual page 10

System Installation Guide
EIM wiring guide — conventional systems
Typical wiring of a conventional system with up to 3-stage heat and 2-stage cool
with one transformer.
POWER
COOL
STATUS
LEDS
1
See guides on following pages for thermostat wiring and geothermal radiant heat wiring.
2
Wire a maximum of 2 sensors using the S1 and S2 terminals. See ISU 5000-6190 for options. S1 and S2 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
Remove jumper(s) if using separate transformers.
4
See Economizer wiring section.
See following pages for additional thermostat wiring guidelines for heat pumps,
geothermal systems and optional Economizer.
69-2490—05
EIM
HEAT
FAN
U1
U2
U3
SENSORS
TO THERMOSTAT
CONV
A
4
1
10
FURNACE
TRANSFORMER
R
24 120
C
VAC VAC
HEAT STAGE 1
W
HEAT STAGE 2
W2
W3
HEAT STAGE 3
G
FAN
COMPRESSOR
Y
STAGE 1
COMPRESSOR
Y2
STAGE 2
JUMPERS
3
CONNECT OPTIONAL
SENSORS TO
S1 AND S2 TERMINALS
(MAX. 2 SENSORS)
2
MCR32945A