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II-Communicating Thermostat (if applicable)
In communicating applications a communicating thermo
stat must 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 figures 19 and 20 for thermostat wiring in communicat
ing applications.
FIGURE 19
Communicating Enabled Furnace and
Non-Communicating Outdoor Unit
COMMUNICATING
ENABLED FURNACE
COMMUNICATING
THERMOSTAT
NON-COMMUNICATING
OUTDOOR AIR
CONDITIONING UNIT -
1 OR 2 STAGE
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
Communicating Enabled Furnace and
Communicating Enabled Outdoor Unit
COMMUNICATING
ENABLED
FURNACE
COMMUNICATING ENABLED
OUTDOOR AIR CONDITIONING
OR HEAT PUMP UNIT
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
CLIP Y1 TO Y2 FOR
TWO-STAGE OPERATION
Indoor Unit
Controller
Outdoor Unit
Communicating
Thermostat
Single wire to
terminal C
Single wire to
terminal C
Unused wires
Unused wires
Communicating systems using a communicating thermostat require four thermo
stat 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 ther
mostat 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 in the diagram above.
COMMUNICATING
THERMOSTAT
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