THE DIGITAL CONTROL
Radome Environmental Control Unit
6
L-2283 ENGLISH
Important Programming Notes To Installer and End User
1.
When powering on the control, press and immediately release the Power button so you do not unintentionally enter
Program Mode. You will enter Program Mode if the Power button is pressed and held for more than 5 seconds. If you
enter Program Mode unintentionally, any subsequent presses of the Up or Down buttons will change the P-1
parameter setting since it is the first parameter shown after entering this mode. This will change the operating mode to
Cool Only, Heat Only, or Automatic, which could result in improper system operation. Always use care when in
Program Mode. For further information, refer to “Using Program Mode” on page 6.
2.
The Radome ECU is a Cool Only system (it does not have a reversing valve), therefore you must make sure the Cool
Only Mode value “1” is set for parameter P-1 (this is the factory default for Radome ECU systems). DO NOT program
Automatic Mode for a Cool Only unit. If Automatic Mode is selected and the thermostat calls for heat, the compressor
will run. Since there is no reversing valve, the air conditioning unit will supply cool air when heating is desired. Cool
Only units do not heat.
However, if you have the electric heat option installed you CAN program Automatic Mode, which will allow the unit to
switch between cooling and heating as needed based on independent high and low set points. See “Automatic Mode”
on page 5 for details.
See “P-1: Operating Mode” on page 7 for more information on how to set the proper operating mode.
See “P-15: Reverse-Cycle or Electric Heat” on page 8 for more information on how to set the electric heat option.
3.
You can restore the last memorized default settings by entering Program Mode and setting P-17 to “rSt”.
Using Program Mode
Entering Program Mode
You can only enter Program Mode from the Off Mode. If necessary, press the Power button to enter Off Mode. Press and hold
the Power button while in the Off Mode until the letter “P” appears in the display. The characters “P1” followed by the P-1
parameter setting appear in the display. The control is now in the Program Mode. If no programming is attempted for one
minute, the control exits Program Mode and returns to Off Mode.
Exiting Program Mode
Press the Power button once to exit Program Mode and return to Off Mode. Or, do not attempt any programming for 50
seconds, then the control exits Program Mode and returns to Off Mode. Any programming changes made while in Program
Mode will be saved and put into operation after exiting Program Mode and returning the control to the On Mode. (If you want the
programming changes to become the new defaults, see “Memorizing New Program Parameters” on page 6.) When you exit
Program Mode the software version number (such as “A24”) appears in the display.
Changing Parameters
While in Program Mode, press and release the Fan button to increment from one program parameter to the next until you reach
the desired parameter number. The programmable parameters range from P-1 through P-22.
When you reach the desired parameter number, use the Up and Down buttons to select the data or set the desired limits for the
parameter being programmed. See Table 2 on page 9 for a list of the parameters, the possible settings for each, and their
factory default settings for the Radome ECU.
Memorizing New Program Parameters
If you want new parameters to be the program defaults, adjust the parameters to the desired settings, then press the Up and
Down buttons simultaneously while in Program Mode. This memorizes the new settings as program defaults and exits the
Programming Mode.
To return to the factory default settings, refer to the factory defaults listed in Table 2 on page 9 and reset the parameters
manually.
Restoring Memorized Default Settings
You can restore the last memorized default settings by entering Program Mode and setting P-17 to “rSt”. The memorized default
settings are restored and the control returns to Off Mode. See “P-17: Reset Memorized Defaults” on page 8 for details. To return
to the factory default settings, refer to the factory defaults listed in Table 2 on page 9 and reset the parameters manually.
Software Identification
The control’s software version (such as “A24”) appears in the display for one second prior to exit from Program Mode, then the
control returns to Off Mode.
