EIM Installation Guide 2012

7
EIM wiring guide — heat pump systems
Typical wiring of a heat pump system with up to four-stage heat and two-stage cool
with one transformer.
See guides on following pages for thermostat wiring and geothermal radiant heat
wiring.
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.
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.
CHANGEOVER VALVE
BACKUP HEAT
STAGE 1
FAN RELAY
SENSORS
TO THERMOSTAT
HEAT PUMP
AIR HANDLER
TRANSFORMER
120
VAC
24
VAC
COMPRESSOR
STAGE 1
COMPRESSOR
STAGE 2
O/B
AUX1
AUX2
O/B
BACKUP HEAT
STAGE 2
COMPRESSOR
MONITOR OR
ZONE PANEL
R
C
AUX1
AUX2
G
L/A
Y2
Y
POWER
HEAT
COOL
FAN
U1
U2
U3
STATUS
LEDS
JUMPERS
L/A
EIM
CONNECT OPTIONAL
SENSORS TO
S1 AND S2 TERMINALS
S4
S4
S3
S3
CONNECT OPTIONAL
SENSORS TO
S3 AND S4 TERMINALS
A
B
C
D
2
2
3
1
3
4
1
2
3
Connect wireless adapter to ABCD for extended wireless range.
4