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COMFORTNET™ SYSTEM
NON-COMM (APPLIES ONLY TO A CT COMPATIBLE FURNACE MATCHED
Submenu Item
Cool Airflow (CL CFM)
Cool Airflow Trim (CL TRM)
Cool Airflow Profile (CL PRFL)
Cool ON Delay (CL ON)
Cool OFF Delay (CL OFF)
T
M
HERMOSTAT
ENU
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.
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
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.
N
ETWORK 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.
WITH A NON-CT COMPATIBLE SINGLE STAGE AIR CONDITIONER)
User Modifiable Options
18, 24, 30, 36, 42, 48, or 60, default
is 18
-10% to +10% in 2% increments,
default is 0%
A, B, C, or D, default is A
5, 10, 20, or 30 seconds, default is
5 seconds
30, 60, 90, or 120 seconds, default
is 30 seconds
Selects the airflow for the non-CT
compatible single stage AC unit
Selects the airflow trim amount for the non-
CT compatible single stage AC unit
Selects the airflow profile for the non-CT
compatible single stage AC unit
Selects the indoor blower ON delay for the
non-CT compatible single stage AC unit
Selects the indoor blower OFF delay for the
non-CT compatible single stage AC unit
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.
Indoor Control
BIAS
TERM
Dipswitches
Dipsw itch
Sw itch 1 Sw itch 2 Sw itch 3 Sw itch 1 Sw itch 2
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
ON
ON
OFF
ON
OFF
OFF
ON or OFF
TERM1 / TERM2 = Termination dipsw itches at outdoor unit. See installation
instructions w ith CT
TM
compatiable outdoor unit.
I ndoor Unit BIAS and TERMINATION Dipswitches
46
Comments
Outdoor
Data Line
Control
Voltages, Vdc
TERM
Dipswitches
1-C
2-C
ON
ON
>2.5
<2.5
ON
ON
>2.8
<2.2
OFF
ON
>2.8
<2.2
ON
OFF
>2.8
<2.2
OFF
OFF
5
ON
ON
0
ON
ON
5
ON or
ON or
0
OFF
OFF
OFF
ON
1
BIAS
BIAS
2
3
TERM
1-2
>0.2
>0.6
>0.6
>0.6
0
5
0
0
5
0
0
0
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Troubleshooting
