33
N
ETWORK
TROUBLESHOOTING
Communications is achieved by taking the difference between
two dc signals. The signals and transmission lines are re-
ferred to as “data 1” and “data 2”. Each transmission line is
biased to approximately 2.5Vdc. During data reception/trans-
mission, the data lines vary b5V and ground. (When
data 1 is increasing t5V, data 2 is decreasing to-
wards ground and when data 1 is decreasing towards ground,
data 2 is increasing t5V. Typically, the data 1 line is
approximately 2.6Vdc and the data 2 transmission line is ap-
proximately 2.3Vdc. The voltage difference between data 1
and data 2 is typically 0.2 to 0.6 Vdc.
The indoor control is equipped with a bank of three dipswitches
that provide biasing and termination functions for the commu-
nications transmission lines. The outdoor control in the com-
municating compatible unit is equipped with a bank of two
dipswitches that provide termination functions for the commu-
nications transmission lines. Communications errors will re-
sult if these switches are not correctly set. The figure below
indicates the switch position for the bias and termination dip
switches. Note that the ON position is the correct position for
all bias and termination dipswitches.
1
2
ON
OFF
3
BIAS
BIAS
TERM
Indoor Unit BIAS and TERMINATION Dip Switches
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-
communicating 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-
communicating 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-
communicating 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-communicating 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-communicating compatible single
stage AC unit
NON-COMM (APPLIES ONLY TO A COMMUNICATING COMPATIBLE FURNACE MATCHED
WITH A NON-COMMUNICATING COMPATIBLE SINGLE STAGE AIR CONDITIONER)
The ComfortNet system is a fully communicating system, and
thus, constitutes a network. Occasionally the need to trouble-
shoot the network may arise. The integrated furnace control
has some on-board tools that may be used to troubleshoot the
network. These tools are: red communications LED, green
receive (Rx) LED, and learn button.
•
Red communications LED – Indicates the status of
the network. The table below indicates the LED status
and the corresponding potential problem.
•
Green receive LED – Indicates network traffic. The
table below indicates the LED status and the
corresponding potential problem.
•
Learn button – Used to reset the network. Depress
the button for approximately 2 seconds to reset the
network.
S
YSTEM
T
ROUBLESHOOTING
NOTE:
Refer to the instructions accompanying the CT
compatible outdoor AC/HP unit for troubleshooting information.
Refer to the Troubleshooting Chart in in the back of this manual
for a listing of possible furnace error codes, possible causes
and corrective actions.
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