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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. (RedLINK FocusPRO up to three-stage heat and two-
stage cool.)
STATUS
LEDS
CONNECT OPTIONAL
SENSORS TO
S3 AND S4 TERMINALS
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, outdoor sensor, discharge sensor,
return sensor, dry contact device to display an alert or an occupancy sensor
for remote setback. RedLINK FocusPRO should only use the return sensor to
any of the four sets of S terminals.
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. (Only Prestige and RedLINK VisionPRO can be set for Economizer or
TOD.)
Connect wireless adapter to ABCD for extended wireless range.
4
EIM
POWER
HEAT
COOL
FAN
U1
U2
U3
A
B
4
C
D
S4
S4
SENSORS
S3
S3
TO THERMOSTAT
HEAT PUMP
O/B
AUX1
AUX2
L/A
3
1
7
O/B
CHANGEOVER VALVE
BACKUP HEAT
STAGE 1
AUX1
BACKUP HEAT
AUX2
STAGE 2
COMPRESSOR
Y
STAGE 1
COMPRESSOR
Y2
STAGE 2
G
FAN RELAY
L/A
COMPRESSOR
MONITOR OR
3
ZONE PANEL
JUMPERS
AIR HANDLER
TRANSFORMER
R
24
120
C
VAC
VAC
CONNECT OPTIONAL
SENSORS TO
S1 AND S2 TERMINALS
2
M34250
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