Manual Dometic Elite Control DX systems (page 11 of 24) (English)

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Elite Control Operations Manual Programming

L-2230 ENGLISH 9

delay, the system will be restarted. As with all faults, system lockout (sustained shutdown) will occur after the fourth consecutive

LAC fault. See “Failsafe and Fault-Handling Codes” on page 13 for further details on system lockout.

P-7: De-Icing Cycle

The de-icing cycle prevents ice build up on the evaporator coil during extended periods of cooling operation. Installation

variables such as grille sizes, length of ducting, insulation, and ambient temperatures determine the run time required to

achieve set point. Factors that substantially increase run time include operating the system with hatches and doors open and

programming an unrealistic set point (e.g. 65°F/18.3°C). Such situations can cause the evaporator to form ice on warm humid

days.

• For software revision A13 and older, de-icing is accomplished by switching the reversing valve into Heat Mode while

the system is cooling. The valve remains energized for the programmed cycle time. The cycle is programmable to

“OFF” or to a period of 1, 2, or 3 minutes.

• For software revision A15 and newer, de-icing is accomplished by closely monitoring the room air temperature in 10-

minute intervals during a cooling cycle. Depending on the parameter value and the change in room temperature during

these monitoring intervals, the control performs various actions to prevent ice from forming or to melt ice that has

already formed. This is accomplished by short compressor shutdown periods combined with a one-speed increase in

fan speed and by periodic Heat Mode cycles with the fan turned off.

The parameter setting for the de-icing feature depends on whether you are using the optional alternate air-temperature sensor

or the display’s built-in room air-temperature sensor. Installation of an optional alternate air temperature sensor (located in the

return air path) greatly increases the effectiveness of the de-icing feature, and this option should be considered whenever the

display sensor cannot read the room temperature accurately.

• If using an optional alternate air temperature sensor, set this parameter to “1” to turn the de-icing feature on, or to

OFF to disable.

• If using the display’s built-in room air temperature sensor, this feature has two selectable behavior modes. Both

modes attempt to compensate for any temperature discrepancy the display sensor experiences. (Although

discrepancy is not typical, installation variables such as where the display is placed inside the room—near an open

door or in direct sunlight—can affect how accurately it reads the actual room temperature.) Set this parameter to “1” to

assume the display sensor may be reading the room temperature as much as 5°F (2.8°C) greater than the actual

evaporator temperature (standard). For more extreme installations, set this parameter to “2” to assume the display

sensor may be reading the room temperature as much as 7°F (3.9°C) greater than the actual evaporator temperature.

The setting of “2” should only be used if a setting of “1” does not prevent evaporator ice from forming.

P-8: Optional Pump Sentry

Elite can be equipped with an optional temperature sensor that is used to monitor the condenser coil temperature. The sensor is

plugged into the “SERVICE/H20” sensor jack and parameter P-8 programmed for a temperature between 100 and 150°F (37.8

and 65.6°C), depending on seawater temperature and the system type. (Note that setting increments are in °F even when the

control is set to display °C.) Connect the water sensor to the condenser coil outlet and insulate it. When the coil temperature

rises above the programmed value, the pump and compressor are shut down and “PLF” flashes in the display.

P-9: Display Brightness Control

The display brightness can be adjusted from 4 to 18, with 4 being the dimmest and 18 the brightest. Typically a dark cabin will

require a setting of 4 or 5. A very bright cabin will require a setting of 12 to 18.

P-10: Fahrenheit or Celsius Selection

The default setting is °F. Select °C for Celsius. (Celsius readings are displayed in tenths, for example 22.2°).

P-11: Cycle Pump With Compressor

To increase pump life and conserve electricity the pump can be programmed to cycle on and off with the compressor. The pump

can also be programmed to operate continuously whenever the system is on. To program the pump for continuous operation,

set P-11 to “con”.

P-12: Reverse Automatic Fan Speeds During Heating

The automatic fan speeds can be reversed during Heat Mode to improve heat output in cooler climates. The fan will speed up

as the set point is approached. Lowering the fan speed when the cabin is cold increases head pressure and helps raise supply

temperature. Increasing the fan speed as the set point is approached also reduces unnecessary high-pressure faults. The fan

switches to low speed when the set point is satisfied and the compressor cycles off. The fan can be programmed to operate the

same as in cooling by programming P-12 “nor” which represents normal fan operation during reverse-cycle heating.

P-13: Reverse-Cycle or Electric Heat

Units not equipped with reverse-cycle heat may have an electric heater added. Set to “ELE” for the electric heat option or “nor”

to disable.

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Dometic Elite Control DX systems Manual

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