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Condensing Unit Wiring
After you have installed the condensing unit, field wire
the unit as shown in installation instructions provided
with the unit.
Option 1 − G32V/G21V/GSR21V Series Gas Furnace
& Condensing Unit
Use thermostat wire to connect the condensing unit to the
furnace. Then use the thermostat wire to connect the con-
densing unit to the Harmony
tions to the condensing unit are marked as OUTDOOR
UNIT. See figure 23.
CB31 Series Blower Coil Wiring
When installation of CB31MV series blower coil unit is
complete, field wire unit as shown in installation instruc-
tions provided with the unit.
Option 2 − CB31MV Series Blower Coil Unit & Lennox
Heat Pump
In CB31MV unit, remove any one of the four wires connected
to K20 blower relay and tape it off. On CB31MV terminal strip,
remove factory installed blue jumper between terminal R and
W2 and connect a jumper between terminal O and R.
Use thermostat wire to make connections from blower coil unit
to the control center. Connections to the blower coil unit are
marked as INDOOR UNIT. See figure 24.
Lennox Heat Pump Unit Wiring
After you have installed the heat pump unit, field wire the
unit as shown in the installation instructions provided with
the unit.
Option 2 − CB31MV Series Blower Coil Unit & Lennox
Heat Pump
Use thermostat wire to connect the heat pump to the
CB31MV series blower coil unit. Then use thermostat wire
to connect the heat pump to the Harmony
ter. Connections to the heat pump are marked as OUT-
DOOR UNIT. See figure 24. Notice that Y2 on the outdoor
unit control center is connected only in Lennox HP21 ap-
plication because it is a two−speed heat pump.
®
II control center. Connec-
®
II control cen-
Option 3 − G32V/G21V/GSR21V Series Gas Furnace,
Lennox Heat Pump & FM21
Use thermostat wire to connect the heat pump to the fur-
nace, the Harmony
system. Connections to the condensing unit are marked as
OUTDOOR UNIT. See figure 25.
FM21 Control Wiring
Option 3 − G32V/G21V/GSR21V Series Gas Furnace,
Lennox Heat Pump & FM21
The furnace transformer should not be used to power the
®
Harmony
II control; however, it may be used to power the
FM21 control. A separate transformer, at least 45VA, must
be used to power the zone control. After you have installed
the Lennox FM21 control system, field wire the unit as
shown in figure 25. Use thermostat wire to connect the heat
pump unit, the furnace, and the Harmony
Economizer Wiring
Option 1 − G32V/G21V/GSR21V Series Gas
Furnace, Condensing Unit,a and Economizer
Install field-provided K43 (part #P−8−3251) 120V coil,
single pole, normally open relay in a convenient location.
Splice normally-open contacts of K43 relay with the field−
provided wire nut and wire into furnace transformer 24V
circuit (hot leg). See figure 26 for remaining field wiring
connections. Use thermostat wire to connect the condens-
ing unit, furnace, economizer and Harmony
ter.
Option 2 − CB31MV Series Blower Coil Unit,
Lennox Heat Pump, and Economizer
Install the field-provided K18 (#69J5701) 24V coil, double
pole, normally closed relay in a convenient location. Wire as
shown in figure 27. Wire the spare set of contacts of the K20
relay into the G and R circuit of the blower coil unit as shown.
Complete remaining field wiring connections as shown in fig-
ure 27. Use thermostat wire to connect the condensing unit,
blower coil unit, economizer, and Harmony
Page 21
®
II control center, and the FM21 control
®
II control center.
®
®
II control cen-
II control center.
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