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COMFORTNET™ SYSTEM
Submenu Item User Modifiable Options Comments
Cool Airflow (CL CFM) 18, 24, 30, 36, 42, 48, or 60, default
is 18
Selects the airflow for the non-CT
compatible single stage AC unit
Cool Airflow Trim (CL TRM) -10% to +10% in 2% increments,
default is 0%
Selects the airflow trim amount for the non-
CT compatible single stage AC unit
Cool Airflow Profile (CL PRFL) A, B, C, or D, default is A Selects the airflow profile for the non-CT
compatible single stage AC unit
Cool ON Delay (CL ON) 5, 10, 20, or 30 seconds, default is
5 seconds
Selects the indoor blower ON delay for the
non-CT compatible single stage AC unit
Cool OFF Delay (CL OFF) 30, 60, 90, or 120 seconds, default
is 30 seconds
Selects the indoor blower OFF delay for the
non-CT compatible single stage AC unit
NON-COMM (APPLIES ONLY TO A CT COMPATIBLE FURNACE MATCHED
WITH A NON-CT COMPATIBLE SINGLE STAGE AIR CONDITIONER)
The indoor control is equipped with a bank of three dipswitches
that provide biasing and termination functions for the communi-
cations transmission lines. The outdoor control in the CT™
compatible unit is equipped with a bank of two dipswitches that
provide termination functions for the communications transmis-
sion lines. Communications errors will result if these switches
are not correctly set. The table below indicates the switch posi-
tion for the bias and termination dipswitches along with the ex-
pected voltages. Note that the ON position is the correct posi-
tion for all bias and termination dipswitches.
THERMOSTAT MENU
If this furnace is installed with a CT compatible heat pump, the
system is recognized as a dual fuel system. The balance point
temperature should be set via the thermostat advanced menu.
Navigate to the THERMOSTAT menu. Press the INSTALLER
CONFIG key. Navigate to the SETUP menu and press the IN-
STALLER CONFIG button. Navigate to dF BAL PNT. Adjust
the dual fuel system balance point using the back/forward ar-
rows.
DIAGNOSTICS
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
above in Accessing and Navigating the Advanced Features Menus.
NOTE: It is highly recommended that the fault history be cleared
when performing maintenance or servicing the furnace.
NETWORK TROUBLESHOOTING
Communications is achieved by taking the difference between
two dc signals. The signals and transmission lines are referred
to as “data 1” and “data 2”. Each transmission line is biased to
approximately 2.5Vdc. During data reception/transmission, the
data lines vary between +5V and ground. (When data 1 is in-
creasing towards +5V, data 2 is decreasing towards ground and
when data 1 is decreasing towards ground, data 2 is increasing
towards +5V. Typically, the data 1 line is approximately 2.6Vdc
and the data 2 transmission line is approximately 2.3Vdc. The
voltage difference between data 1 and data 2 is typically 0.2 to
0.6 Vdc.
TERM
Dips w it ch
Sw itch 1 Sw itch 2 Switch 3 Sw itch 1 Sw itch 2
ON ON ON ON ON >2.5 <2.5 >0.2
ON ON OFF ON ON >2.8 <2.2 >0.6
ON ON ON OFF ON >2.8 <2.2 >0.6
ON ON ON ON OFF >2.8 <2.2 >0.6
ON ON OFF OFF OFF 5 0 5
OFFONONONON000
ON OFF ON ON ON 5 5 0
OFF OFF ON or OFF
ON or
OFF
ON or
OFF
000
BIAS
Dips w it che s
Indoor Control
TERM1 / TERM2 = Termination dipsw itches at outdoor unit. See installation
instructions w ith CT
TM
compatiable outdoor unit.
Data Line
Voltages, Vdc
Outdoor
Control
1-C 2-C 1-2
TERM
Dipswitches
1
2
ONOFF
3
BIAS
BIAS
TERM
Indoor Unit BIAS and TERMINATION Dipswitches
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