44
CTK0* W
IRING
NOTE:
A removable plug connector is provided with the control to
make thermostat wire connections. This plug may be removed,
wire connections made to the plug, and replaced. It is
STRONGLY
recommended that you do not connect multiple wires into a
single terminal. Wire nuts are recommended to ensure one
18 AWG wire is used for each terminal. Failure to do so may
result in intermittent operation.
Typical 18 AWG thermostat wire may be used to wire the system
components. One hundred (100) feet is the maximum length of
wire between indoor unit and outdoor unit, or between indoor unit
and thermostat. Wire runs over (100) feet require larger gauge
wire.
F
OUR
-W
IRE
I
NDOOR
AND
O
UTDOOR
W
IRING
Typical ComfortNet wiring will consist of four wires between the
indoor unit and outdoor unit and between the indoor unit and ther-
mostat. The required wires are: (a) data lines, 1 and 2; (b) thermo-
stat “R” (24 VAC hot) and “C” (24 VAC common).
1
2
R C
1
2
R C
CTK0*
Thermostat
ComfortNet Compatible Furnace
Integrated Control Module
ComfortNet Compatible AC/HP
Integrated Control Module
1
2
R C
System Wiring using Four-Wires
T
WO
-W
IRE
O
UTDOOR
, F
OUR
-W
IRE
I
NDOOR
W
IRING
Two wires can be utilized between the indoor and outdoor units.
For this wiring scheme, only the data lines, 1 and 2, are needed
between the indoor and outdoor units. A 40VA, 208/230 VAC to
24VAC transformer must be installed in the outdoor unit to provide
24VAC power to the outdoor unit’s electronic control. See in-
struction manual provided with the thermostat for wiring in-
structions.
NOTE:
Use of a transformer is recommended if installing a dual
fuel/fossil fuel system. Failure to use the transformer in the outdoor
unit could result in over loading of the furnace transformer.
1
2
R C
1
2
R
C
CTK0*
Thermostat
ComfortNet Compatible
Furnace Integrated
Control Module
ComfortNet Compatible
AC/HP Integrated
Control Module
40VA Transformer
208/230 VAC
24 VAC
1
2
R C
System Wiring using Two-Wires between Furnace and AC/HP and
Four-Wires between Furnace and Thermostat
C
OMFORT
N
ET
™ C
OMPATIBLE
F
URNACE
WITH
N
ON
-C
OMFORT
N
ET
COMPATIBLE
S
INGLE
-S
TAGE
A
IR
C
ONDITIONER
Four wires are required between the furnace and thermostat. Two
wires are required between the furnace control and single stage air
conditioner. For this system configuration, the “Y1” terminal on
the integrated furnace control becomes an output rather than an
input. The “Y1” connection to the outdoor unit is made using both
4-position thermostat connectors in the CTK0* kit. Remove the
red keying tabs from the on-board connector block and position
both 4-position connector such that “1”, “2”, “R”, “C”, and “Y1”
positions are filled.
1
2
R C
C
Y
ComfortNet Compatible
Furnace Integrated
Control Module
CTK0*
Thermostat
Non-
Compatible
Single Stage AC
ComfortNet
G
W1 W2
Y1
Y2
O
1
2
R
C
4-Position Connectors
from CTK0*
Thermostat Kit
System Wiring between Furnace and Non-Communicating
Compatible Single Stage Air Conditioner
C
OMFORT
N
ET
S
YSTEM
A
DVANCED
F
EATURES
The ComfortNet system permits access to additional system in-
formation, advanced setup features, and advanced diagnostic/
troubleshooting features. These advanced features are organized
into a menu structure. The menus are accessed and navigated by
means of the CTK0* thermostat. For details, see the thermo-
stat instruction manual.
