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EIM wiring guide — geothermal radiant heat
Typical wiring for geothermal radiant heat, geothermal forced-air, and backup heat
with one transformer.
STATUS
LEDS
OPTIONAL
2
JUMPER
CONNECT OPTIONAL
SENSORS TO
S3 AND S4 TERMINALS
4
1
U1, U2 or U3 terminals must be used for geothermal radiant heat. Thermostat
allows 2 stages of radiant heat—geothermal (stage 1) and boiler (stage 2).
2
"U" terminals are normally open dry contacts when set up for geothermal
radiant heat. You must install a field jumper if radiant heat is powered by system
transformer. Do NOT install a field jumper if radiant heat has its own transformer.
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 wiring
section.
Wire a maximum of 4 sensors using the S1-S4 terminals. S1-S4 terminals can
4
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.
Connect wireless adapter to ABCD for extended wireless range.
5
EIM
POWER
HEAT
COOL
FAN
U1
U2
U3
A
B
C
5
D
JUMPERS
S4
S4
SENSORS
S3
S3
TO THERMOSTAT
HEAT PUMP
O/B
AUX1
AUX1
AUX2
AUX2
L/A
3
8
O/B
CHANGEOVER VALVE
BACKUP HEAT
STAGE 1
BACKUP HEAT
STAGE 2
COMPRESSOR
Y
STAGE 1
COMPRESSOR
Y2
STAGE 2
G
FAN RELAY
L
COMPRESSOR MONITOR
OR ZONE PANEL
3
GEOTHERMAL RADIANT
HEAT STAGE 1
1
AIR HANDLER
TRANSFORMER
R
24
120
C
VAC
VAC
2
CONNECT OPTIONAL
SENSORS TO
S1 AND S2 TERMINALS
4
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