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icomfort WI-Fi
®
Thermostat with SL280UHV
and Non-Communicating Outdoor Unit
icomfort-
ENABLED
SL280UHV
FURNACE
icomfort Wi-Fi®
THERMOSTAT
NON-COMMUNICATING
OUTDOOR AIR
CONDITIONING UNIT -
1 OR 2 STAGE
icomfort Wi-Fi
®
Thermostat
icomfort-Enabled SL280UHV Indoor Furnace
Non-Communicating Outdoor Air Conditioner
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
icomfort Wi-Fi
®
Thermostat with SL280UHV
and icomfort-ENABLED Outdoor Unit
icomfort Wi-Fi
®
Thermostat
icomfort-Enabled SL280UHV Indoor Furnace
icomfort-Enabled Outdoor Air Conditioner or Heat Pump
icomfort-
ENABLED
SL280UHV
FURNACE
icomfort- ENABLED
OUTDOOR AIR CONDITIONING
OR HEAT PUMP UNIT
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
CLIP ON-BOARD LINK
W915 (Y1 TO Y2) FOR
TWO-STAGE OPERATION
icomfort Wi-Fi®
THERMOSTAT
Communicating systems using the icomfort Wi-Fi
®
thermostat require four thermostat
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.
Indoor Unit Controller
Outdoor Unit
icomfort Wi-Fi
®
thermostat
Single wire
to terminal C
Single wire
to terminal C
Unused wires
Unused wires
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