38
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
thermostat. The required wires are: (a) data lines, 1 and 2; (b)
thermostat “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
Figure 51
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 pro-
vide 24VAC power to the outdoor unit’s electronic control. See
instruction manual provided with the thermostat for wiring
instructions.
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
Figure 52
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
Figure 53
C
OMFORT
N
ET
S
YSTEM
A
DVANCED
F
EATURES
The ComfortNet system permits access to additional system
information, advanced setup features, and advanced diagnos-
tic/troubleshooting features. These advanced features are or-
ganized into a menu structure. The menus are accessed and
navigated by means of the CTK0* thermostat. For details,
see the thermostat instruction manual.
