508151-01
Issue 2104
Page 61 of 72
Figure 56.
Indoor Unit
Controller
Outdoor Unit
Single wire to
terminal C
Single wire to
terminal C
Unused wires
Unused wires
Comfort Sync
Wifi Thermostat
Communicating systems using the Comfort Sync Wifi 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.
NON-COMMUNICATING
OUTDOOR AIR
CONDITIONING UNIT -
1 OR 2 STAGE
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
CLIP ON-BOARD LINK
W915 (Y1 TO Y2) FOR
TWO-STAGE OPERATION
Comfort Sync Wifi Thermostat with A96US2V
and Non-Communicating Outdoor Unit
Comfort Sync Wifi Thermostat
Comfort Sync-enabled A96US2V Indoor Furnace
Non-Communicating Outdoor Air Conditioner
COMFORT
SYNC
ENABLED
FURNACE
INDOOR EQUIPMEN
T
COMFORT SYNC
WIFI THERMOSTAT
2 STG. ONLY
LSOM ONLY
INDOOR EQUIPMEN
T
COMFORT
SYNC
ENABLED
FURNACE
COMFORT SYNC
WIFI THERMOSTAT
COMFORT SYNC-ENABLED
OUTDOOR AIR CONDITIONING
OR HEAT PUMP UNIT
Comfort Sync Wifi Thermostat with A96US2V
and Comfort Sync-enabled Outdoor Unit
Comfort Sync Wifi Thermostat
Comfort Sync-enabled A96US2V Indoor Furnace
Comfort Sync-enabled Outdoor Air Conditioner or Heat Pump