Honeywell Home VisionPRO 8000 Manual page 123

Typical wiring for geothermal radiant heat, geothermal forced-air, and backup heat with one transformer.
4
1U1, U2 or U3 terminals must be used for geothermal radiant heat (ISU 201). 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.
3L/A terminal sends continuous output when thermostat is set to EM HEAT mode except when set up for Economizer or
TOD. See "Economizer Module Wiring Diagrams" beginning on page 133.
4Wire 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.
5Connect wireless adapter to ABCD for extended wireless range.
NOTE: For setup and operation, see "Geothermal Radiant Heat" beginning on page 79.
EIM
POWER
HEAT
COOL
STATUS
FAN
LEDS
U1
U2
U3
OPTIONAL
JUMPER
2
A
B
C
5
D
S4
CONNECT OPTIONAL
S4
SENSORS TO
S3 AND S4 TERMINALS
S3
S3
Fig. 316. EIM wiring guide — geothermal radiant heat.
TO THERMOSTAT
HEAT PUMP
O/B
AUX1
AUX1
AUX2
AUX2
L/A
3
JUMPERS
SENSORS
123
®
VISIONPRO 8000 WITH REDLINK™
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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