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Fig. 321. Geothermal radiant heat with geothermal forced air and backup heat using separate transformer for the
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.
4Y2 used with heat pumps that have 2 compressor stages.
NOTE: For setup and operation, see "Geothermal Radiant Heat" beginning on page 79.
THERMOSTAT/EIM
TO THERMOSTAT
FURNACE
HEAT PUMP
O/B
AUX1
AUX2
L/A
3
1
C
R
radiant heat.
HEAT PUMP
O
O
W1
Y
4
W2
Y2
Y
R
Y2
C
G
R
PUMP
C
RADIANT HEAT
ZONE MODULE
VALVE
TRANSFORMER
24
120
VAC
VAC
125
®
VISIONPRO
8000 WITH REDLINK™
M34525
68-0312—06
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