Radome Environmental Control Unit
THE DIGITAL CONTROL
L-2283 ENGLISH
9
P-18: (Reserved for future use)
P-19: (Reserved for future use)
P-20: Air Filter Cleaning/Replacement Timer Setting
Use this feature for a reminder to clean or replace the unit’s air filter. The parameter entered represents that number times 10
hours. Select the number of operating hours until the filter reminder appears. Parameter choices are between 10 (100 hours)
and 250 (2500 hours). Dometic recommends that you check the air filter at least every 500 hours of operation. The default
setting is off, designated with “00”.
P-21: Air Filter Cleaning/Replacement Timer Value & Reset
This parameter displays the current elapsed time (in hours times 10) since the timer was started or reset. For example, if the
value of P-21 is “30”, then between 300-399 hours have elapsed since the timer was started or reset. Once the value of P-21
reaches the value set in P-20 (explained above), “FIL” flashes on the LED display every 10 seconds until it is cleared. To clear
the “FIL” reminder, press either the Up or Down button while viewing the P-21 parameter. This resets P-21 to 0 and restarts the
timer.
P-22: Voltage Calibration
This feature displays the voltage being read by the power and logic circuit board. It displays a live reading of the voltage and can
be manipulated by pressing the Up or Down buttons. Calibrating this parameter provides a more accurate voltage level when
calculating low voltage for P-7. Use a reliable voltmeter as a reference when adjusting this parameter.
P-23: Auto Mode Heat Differential
(Available only in software revision A25 and newer.)
This parameter creates a larger temperature differential between
cooling and heating operation in Automatic Mode. It is adjustable between 4°F and 40°F and is OFF by default. Typically, in
Automatic Mode (with P-23 OFF), the unit will maintain a single set point, only switching between cooling and heating when a
4°F (2.2°C) change in temperature occurs. Using this parameter creates a new secondary heating set point anywhere from 4°F
to 40°F below the cooling set point. For example, if P-23 is set to 30, and the control set point is 70°F, the air conditioning unit
will provide cooling only until the air temperature reaches 70°F, but it will NOT provide heating unless the air temperature drops
below 40°F (70°F minus 30°F). The system would therefore maintain a wider range of temperatures (between 40°F and 70°F)
without unnecessarily running the air conditioning system.
Table 2: Programmable Parameters - Ranges and Factory Defaults
Parameter
Number
Description
Radome ECU
Factory
Default
Custom
Default
Parameter Range
P-1
Operating Mode
1
0 = Auto
1 = Cool Only
2 = Heat Only
P-2
High Fan-Speed Limit
95
65 - 95
P-3
Low Fan-Speed Limit
64
30 - 64
P-4
Compressor Staging Time
Delay
135
5 - 135 seconds
P-5
Temperature-Sensor Calibration
Ambient temp
Ambient plus or minus 10° F
P-6
Failsafe Level
2
0 = Minimal Protection
1 = Continuous No Display
2 = Continuous With Display
3 = Four Failures Reset Required
P-7
Low AC Voltage Shutdown
(Volts)
115V: OFF
220/230V: OFF
115V: 75 - 105
220/230V: 175 - 205
P-8
De-Icing Cycle
OFF
OFF
1 = On with 5°F Display Sensor Differential
2 = On with 7°F Display Sensor Differential
P-9
Pump Sentry
OFF
OFF
On = Select 100°F to 150°F
P-10
Display Brightness Control
9
4 (Dimmest) - 13 (Brightest)
