COMFORTNET™ SYSTEM
WITH A
Submenu Item | User Modifiable Options | Comments |
Cool Airflow (CL CFM) | 18, 24, 30, 36, 42, 48, or 60, default | Selects the airflow for the |
| is 18 | compatible single stage AC unit |
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Cool Airflow Trim (CL TRM) | Selects the airflow trim amount for the non- | |
| default is 0% | 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 |
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| compatible single stage AC unit |
Cool ON Delay (CL ON) | 5, 10, 20, or 30 seconds, default is | Selects the indoor blower ON delay for the |
| 5 seconds | |
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Cool OFF Delay (CL OFF) | 30, 60, 90, or 120 seconds, default | Selects the indoor blower OFF delay for the |
| is 30 seconds | |
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NETWORKTROUBLESHOOTING
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 recep- tion/transmission, the data lines vary between +5V and ground. (When data 1 is increasing 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.
The indoor control is equipped with a bank of three dipswitches that provide biasing and termination functions for the communications transmission lines. The outdoor control in the CT compatible unit is equipped with a bank of two dipswitches that provide termination functions for the com- munications transmission lines. Communications errors will result if these switches are not correctly set. The table below indicates the switch position for the bias and termina- tion dipswitches along with the expected voltages. Note that the ON position is the correct position for all bias and termination dipswitches.
OFF | ON | |||||
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shoot the network may arise. The integrated furnace control has some
•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.
SYSTEM TROUBLESHOOTING
NOTE: Refer to the instructions accompanying the CT compatible outdoor AC/HP unit for troubleshooting information.
Refer to the Troubleshooting Chart in the Appendix for a listing of possible furnace error codes, possible causes and correc- tive actions.
Indoor Unit BIAS and TERMINATION Dipswitches
The ComfortNet system is a fully communicating system, and thus, constitutes a network. Occasionally the need to trouble-
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