Radome Environmental Control Unit
THE DIGITAL CONTROL
L-2283 ENGLISH
7
Programming
Programming procedure
1.
Enter Program Mode. (See “Entering Program Mode” on page 6 for details.)
2.
Press and release the Fan button to increment from one program parameter to the next.
3.
Use the Up and Down buttons to change the parameter’s setting.
4.
Press the Power button to exit Program Mode and return the control to Off Mode. Or, to memorize the changes as the
new defaults, simultaneously press the Up and Down buttons (optional).
Programmable Parameters
The system’s default parameters may be changed by the installing dealer or end user. Once new values are entered and
memorized, the factory defaults are overwritten and the new parameters become the default values. You can restore the original
factory default parameters manually. A summary of the parameters, the permitted values, and Radome ECU original factory
default settings of each are listed in Table 2, page 9.
P-1: Operating Mode
For Radome ECU select “1” for Cool Mode only. If your particular system has the electric heater option installed and heating is
desired, set this parameter to “2” for Heat Mode only, or to “0” for Automatic Mode. See “P-15: Reverse-Cycle or Electric Heat”
on page 8 for more information.
P-2: High Fan Limit
Not used on Radome ECU.
P-3: Low Fan Limit
Not used on Radome ECU.
P-4: Compressor Staging Time Delay
Not used on Radome ECU.
P-5: Temperature Calibration
This feature calibrates the ambient sensor within a range of ±10°F. Adjust this parameter to display the correct room-
temperature reading. Note that setting increments are in °F even when the control is set to display °C.
P-6: Failsafe Level
To protect the equipment, certain fault conditions trigger a lockout: The control shuts down and will not restart until the fault is
repaired.
The lockout condition depends on a combination of the failsafe level you have programmed as well as the type of fault
detected.
One of the following fault codes displays when a fault is detected:
•
ASF
– Indicates air sensor failure.
•
FIL
– Indicates filter needs to be cleaned or replaced.
•
HPF
– Indicates high refrigerant
pressure. When in Heat Mode, “HPF” does not display and does not cause lockout.
•
LAC
– Indicates low AC voltage.
•
LPF
– Indicates low refrigerant pressure. “LPF” has a 10-minute shut down delay.
There are four failsafe levels:
Failsafe Level 0
This level provides minimal failsafe protection and is not recommended. Only the “ASF” fault is detected and dis-
played. The control shuts down and will not restart until the fault is repaired. When the fault is repaired the control
restarts.
NOTE
If you have any reason to contact Dometic about the system or programming the control, you must have the software
identification number and air conditioning unit serial number available. The serial number may be found on the
dataplate label.
IMPORTANT
If you have any programming problems or confusion occurs, reset the Memorized Default Settings by entering
Program Mode and setting P-17 to “rSt”.
