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OPERATION
3.
Low Voltage Monitor The Smart Touch has a built-in voltmeter circuit that
monitors the AC input voltage. Depending on whether the input power supply
is 115V AC or 230V AC, this parameter can be set to "Off", 75-120V AC of
115V AC input power, or 175-240V AC of 230V AC input power. The factory
default setting is Off. When this parameter is set to 75-120 or 175-240V AC,
the Smart Touch checks the AC input voltage prior to each cooling or heating
cycle and prevents the compressor from starting if the voltage is less than
the one set. This provides extra protection for the compressor and
components within the system during low voltage (brownout) conditions. If
this low voltage condition occurs, the fault code Low AC Voltage appears in
the Status icon in the Main display. The fault will continue until the AC input
voltage rises above selected voltage value, at which time the Low AC
Voltage fault code clears automatically and the cooling or heating cycle will commence. After the compressor is
started, the low voltage monitor continues to check the AC input voltage. If it drops below the specified setting and
remains below for 5 minutes, the system will shut down and the Low AC Voltage fault will be displayed. The system will
remain shut down until the voltage goes back above the specified setting. Once the voltage is restored, after the
normal fault recovery delay, the system will be restarted. As with all faults, system lockout (sustained shutdown) will
occur after the fourth consecutive Low AC Voltage fault. See Fault Handling, History & Run Hours for further details on
system lockout.
4.
De-Ice Cycle The de-icing cycle prevents ice buildup 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. 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 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 "SERVICE/H20" sensor jack. 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.
14
Smart Touch Cabin Control Installation & Operations Manual
Figure 19: Smart Touch DX
Settings Page 1 of 2
L-3380 ENGLISH
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