Lennox iComfort SL280UH070V36A Manual page 53

®
icomfort WI-Fi Thermostat with SL280UHV
and Non-Communicating Outdoor Unit
®
icomfort Wi-Fi Thermostat
icomfortt-Enabled SL280UHV Indoor Furnace
Non-Communicating Outdoor Air Conditioner
icomfortt-
ENABLED
SL280UHV
FURNACE
OPTIONAL
DISCHARGE
AIR SENSOR
icomfort Wi-Fi®
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
Communicating systems using the icomfort Wi-Fi
wires between the thermostat and the furnace/air handler control and four wires be­
tween 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 below.
Single wire
to terminal C
Unused wires
®
icomfort Wi-Fi Thermostat with SL280UHV
and icomfortt-ENABLED Outdoor Unit
®
icomfort Wi-Fi Thermostat
icomfortt-Enabled SL280UHV Indoor Furnace
icomfortt-Enabled Outdoor Air Conditioner or Heat Pump
OPTIONAL
DISCHARGE
AIR SENSOR
OPTIONAL
OUTDOOR
AIR SENSOR
icomfort Wi-Fi®
THERMOSTAT
®
thermostat require four thermostat
Indoor Unit Controller
Single wire
to terminal C
Page 53
icomfortt-
ENABLED
SL280UHV
FURNACE
icomfortt- ENABLED
OUTDOOR AIR CONDITIONING
OR HEAT PUMP UNIT
®
icomfort Wi-Fi thermostat
Unused wires