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MODES OF OPERATION
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 Enable with 5°F/3°C Sensor
Differential 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 2 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 or Enable with 5°F/3°C Sensor Differential 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 Enable with 7°F/4°C Sensor Differential 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 the second option should only be used if the selection of the first option does not prevent evaporator ice from
forming.
5.
Pump Sentry Smart Touch can be equipped with an optional temperature sensor that is used to monitor the
condenser coil temperature. The sensor is plugged into the "H20 OUT" sensor plug. The Pump Sentry setting can be
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 "Pump Sentry Fault" flashes in the display.
6.
Pump Operate Mode 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 power is applied. To program the pump for continuous operation, set the setting to Continuous.
7.
Low Pressure Detection When selecting "Set by Jumper", if the "Enable
LP" jumper on the main control board is not removed, the low pressure
switch will be disabled, and if the jumper is removed the low pressure switch
will be enabled. Choosing "Disabled (Use Caution)" will force the Smart
Touch to ignore the low pressure switch, treating it as disabled even if the
jumper is removed. This should only be done when advised by Dometic
Customer Service. As with all faults, system lockout (sustained shutdown)
will occur after the fourth consecutive Low Pressure fault.
8.
Seawater Low Limit Adjustment (Optional; Factory Default: 40°F) If the
optional seawater sensor is connected to the control board, this feature
allows the system to switch from reverse-cycle heat to electric heat (if an auxiliary electric heater is installed and
enabled) if the seawater temperature drops below 40°F (4.4°C) (default) and the reverse-cycle heat has operated
more than five minutes. Once the seawater rises 3°F above the Seawater Low Limit temperature, the system returns to
reverse-cycle heating. If an aux heater is not installed, the system will shut down and flash "LO" then "SE" when the
seawater drops below 40°F (4.4°C) (default). Once the seawater rises 3°F above the Seawater Low Limit temperature,
the system goes back into reverse-cycle heating and stops flashing "LO" then "SE". The range of adjustment is 35°F to
50°F.
16
Smart Touch Cabin Control Installation & Operations Manual
Figure 21: Smart Touch
DX Settings Page 3 of 3
L-3380 ENGLISH
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