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Fig. 343. Wood stove with heat pump and backup electric strips. (For applications in which the thermostat only needs
1 Select Geothermal Radiant Heat at ISU 2010. Connect Fan to U1, U2, or U3 as shown in the wiring diagram.
2 "U" terminals are normally open dry contacts when set up for geothermal radiant heat.
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 Module Wiring Diagrams" beginning on page 154.
4 Y2 used with heat pumps that have 2 compressor stages.
NOTE: In Fig. 343, the thermostat will energize only the fan with a call for stage 1 heat. If the wood stove is hot, heat
comes from the fan coil. If the wood stove is cold, only the fan runs. The thermostat will upstage to the heat pump
and backup heat as needed to maintain the temperature.
THX9321 PRESTIGE
THERMOSTAT/EIM
TO THERMOSTAT
AIR HANDLER
HEAT PUMP
O/B
AUX1
AUX2
L/A
4
1
2
to run the blower fan when stove is hot).
151
®
2.0 AND THX9421 PRESTIGE
HEAT PUMP
O
O
W
Y
4
Y2
Y
R
Y2
C
G
R
C
M31487
®
IAQ WITH EIM
68-0311—07
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