EIM Installation Guide 2012

8
Typical wiring for geothermal radiant heat, geothermal forced-air, and backup heat
with one transformer.
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).
“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.
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.
O/B
AUX1
AUX2
O/B
R
C
AUX1
AUX2
G
L
Y2
Y
L/A
CHANGEOVER VALVE
BACKUP HEAT
STAGE 1
FAN RELAY
120
VAC
24
VAC
COMPRESSOR
STAGE 1
COMPRESSOR
STAGE 2
BACKUP HEAT
STAGE 2
COMPRESSOR MONITOR
OR ZONE PANEL
GEOTHERMAL RADIANT
HEAT STAGE 1
AIR HANDLER
TRANSFORMER
STATUS
LEDS
JUMPERS
OPTIONAL
JUMPER
POWER
HEAT
COOL
FAN
U1
U2
U3
TO THERMOSTAT
HEAT PUMP
EIM
3
1
3
S4
S4
S3
S3
CONNECT OPTIONAL
SENSORS TO
S3 AND S4 TERMINALS
A
B
C
D
4
SENSORS
2
CONNECT OPTIONAL
SENSORS TO
S1 AND S2 TERMINALS
4
2
5
EIM wiring guide — geothermal radiant heat
1
2
3
Wire a maximum of 2 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.
4
Connect wireless adapter to ABCD for extended wireless range.
5