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EIM Wiring Diagrams
Typical wiring of a conventional system with up to 3-stage heat and 2-stage cool with one transformer.
2
1 See guides on following pages for thermostat wiring and 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, out-
door 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 Module Wiring Diagrams" beginning on page 154.
5 Connect wireless adapter to ABCD for extended wireless range.
EIM
POWER
HEAT
COOL
STATUS
FAN
LEDS
U1
U2
U3
A
B
5
C
D
S4
CONNECT OPTIONAL
S4
SENSORS TO
S3 AND S4 TERMINALS
S3
S3
Fig. 324. EIM wiring guide — conventional systems.
®
THX9321 PRESTIGE
2.0 AND THX9421 PRESTIGE
TO THERMOSTAT
CONV
A
4
1
SENSORS
141
®
FURNACE
TRANSFORMER
R
24
120
C
VAC
VAC
HEAT STAGE 1
W
HEAT STAGE 2
W2
W3
HEAT STAGE 3
G
FAN
Y
COMPRESSOR
STAGE 1
Y2
COMPRESSOR
STAGE 2
JUMPERS
3
CONNECT OPTIONAL
SENSORS TO
S1 AND S2 TERMINALS
2
IAQ WITH EIM
68-0311—07
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