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Honeywell YTHM5421R1010/U Guia De Instalacion página 7

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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.
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.
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.
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

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Thm5421r1021Th8320r1003/u