Communicating Thermostat - Lennox SLP99DFV Series Manual

II-Communicating Thermostat (if applicable)
In communicating applications a communicating thermostatmust be used. In these applications the thermostat overrides
the DIP switch settings on the integrated control. Refer to the illustrations provided with the thermostat for installation,
set-up and operation. See FIGURE 20, FIGURE 21 and FIGURE 22 for thermostat wiring in communicating applications.
Communicating Enabled Furnace and
Non-Communicating Outdoor Unit
ENABLED FURNACE
OPTIONAL
DISCHARGE
AIR SENSOR
COMMUNICATING
THERMOSTAT
CLIP Y1 TO Y2 FOR
TWO-STAGE OPERATION
Outdoor Unit
COMMUNICATING
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 a 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
nected.
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 in the diagram above.
Communicating Enabled Furnace and
Communicating Enabled Outdoor Unit
COMMUNICATING
ENABLED FURNACE
OPTIONAL
DISCHARGE
AIR SENSOR
OPTIONAL
OUTDOOR
AIR SENSOR
COMMUNICATING
THERMOSTAT
Single wire to
terminal C
Unused wires
FIGURE 20
Page 36
COMMUNICATING ENABLED
OUTDOOR UNIT

Communicating Thermostat