Lennox EL296UHV Series Unit Information page 95

VIII- Field Wiring With Conventional and Communicating Enabled Thermostat
Ignition Control 103130-05
Communicating Enabled Furnace with
a Non-Communicating Outdoor Unit
COMMUNICATING
FURNACE
OPTIONAL
DISCHARGE
AIR SENSOR
COMMUNICATING
THERMOSTAT
CLIP ON-BOARD LINK
W915 (Y1 TO Y2) FOR
TWO-STAGE OPERATION
Outdoor Unit
OPTIONAL
OUTDOOR
AIR SENSOR
NON-COMMUNICATING
OUTDOOR AIR
CONDITIONING UNIT -
1 OR 2 STAGE
Indoor Unit
Controller
Single wire to
terminal C
Unused wires
Communicating systems using the Communicating thermostat require four
thermostat wires between the thermostat and the furnace/air handler control
and four wires between the outdoor unit and the furnace/air handler control.
When a thermostat cable with more than four wires is used, the extra wires
must be properly connected to avoid electrical noise. The wires must not be
left disconnected.
Use wire nuts to bundle the four unused wires at each end of the cable. A
single wire should then be connected to the indoor unit end of the wire bundle
and attached to the "C" terminals as shown above.
Page 95
Communicating Enabled Furnace with a
Communicating Enabled Outdoor Unit
COMMUNICATING
FURNACE
OPTIONAL
DISCHARGE
AIR SENSOR
OPTIONAL
OUTDOOR
AIR SENSOR
COMMUNICATING
THERMOSTAT
Single wire to
terminal C
Unused wires
DOOR AIR CONDITIONING
OR HEAT PUMP UNIT
COMMUNICATING
THERMOSTAT