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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.
40VA Transformer
24 VAC
208/230 VAC
System Wiring using Two-Wires between Furnace and AC/HP
and Four-Wires between Furnace and Thermostat
C
N
™ C
OMFORT
ET
OMPATIBLE
C
N
OMFORT
ET COMPATIBLE
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 connectors such that "1", "2", "R", "C", and "Y1" positions
are filled.
CTK0*
4-Position Connectors
Thermostat
from CTK0*
Thermostat Kit
1
2
R
C
1
2 R C
G
W1 W2 Y1
C
System Wiring between Furnace and Non-Communicating
Compatible Single Stage Air Conditioner
CTK0*
Thermostat
1
2
R C
ComfortNet Compatible
1
2
R C
Furnace Integrated
Control Module
ComfortNet Compatible
1
2
R C
AC/HP Integrated
Control Module
F
N
-
URNACE WITH
ON
S
-S
A
C
INGLE
TAGE
IR
ONDITIONER
ComfortNet Compatible
O
Y2
Furnace Integrated
Control Module
Non-
ComfortNet
Compatible
Y
Single Stage AC
C
N
™ S
OMFORT
ET
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 sheet.
T
M
HERMOSTAT
ENU
If this furnace is installed with a communicating compatible
heat pump, the system is recognized as a dual fuel system.
The balance point temperature should be set via the thermo-
stat advanced menu.
D
IAGNOSTICS
Accessing the furnace's diagnostics menu provides ready ac-
cess to the last six faults detected by the furnace. Faults are
stored most recent to least recent. Any consecutively repeated
fault is stored a maximum of three times. Example: A clogged
return air filter causes the furnace limit to trip repeatedly. The
control will only store this fault the first three consecutive times
the fault occurs. Navigate to the diagnostics menu as described
in the thermostat installer manual.
NOTE: It is highly recommended that the fault history be cleared
when performing maintenance or servicing the furnace.
32
A
F
YSTEM
DVANCED
EATURES
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Table of Contents
Troubleshooting
