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MODES OF OPERATION
17. Supply Air Temp Limit Enabling this parameter has no effect unless
General Setting Electric Heat Option or Auxiliary Heat Option is also enabled
(set to "On"). Use of this parameter requires that the OAT sensor is placed in
the supply air stream immediately downstream of the blower discharge. This
setting is the maximum the supply air discharge temperature will allow. Heat
mode will be shut down if the temperature of this sensor exceeds the
programmed setpoint. Heat mode will be restored once a 10°F hysteresis
has been satisfied. Heat mode will also be restored if power is cycled to the
control and the OAT sensor temperature is less than the setting but still
within the hysteresis. There is no fault indication when this condition occurs
and no lock-out. The discharge temperature can be displayed by pressing
the temperature icon until the temperature title shows Outside (same as viewing the Outside Air Temperature).
18. DX/CW Mode Selection Choosing "Set by Jumper" preserves the status of the control board operation where if the
"Removed for CW" jumper on the main control board is not removed, the Smart Touch will operate in DX mode, and if the
jumper is removed, the Smart Touch will operate in CW mode. The other choices for this parameter allow the jumper to
be overridden, if desired.
19. Inside Temp Sensor Selection If the alternate air temperature sensor is
plugged into the control board, it is used as the inside temperature, and if it is
not plugged in, the built-in display temperature sensor is used for inside
temperature. This parameter allows this behavior to be overridden if desired.
20. Fan Operational Mode The fan can be set to run continuously whenever the
system is turned on, or it can be set to cycle on and off in conjunction with
the cooling or heating cycles.
21. Dual Temp Set Points When Off, there is only one common set point, which
is adjustable and used for both heating and cooling. When On, two separate
set points are settable and used, one for cooling and one for heating.
22. Humidity Sensor Limit Adjustment
For DX applications (Optional; Factory Default: 60% RH) If the optional
humidity sensor is connected to the control board, this feature allows the
system to dehumidify with auxiliary electric heat (if auxiliary electric heat is
installed and enabled) when the cabin humidity rises above 60% (default)
relative humidity (RH). The electric heater will cycle on and off to maintain
set point while the compressor turns on to dehumidify. When the room
temperature has reached the set point, the compressor will remain on. The
display will indicate that the system is in "Dehumidify" mode. If the
temperature decreases by one degree, the auxiliary electric heat will turn on
to maintain the set point and the compressor will remain on. If the temperature increases back to set point, the electric
heat will turn off. If the temperature increases one degree above the set point, the compressor will remain on. This
operation will continue until the cabin's relative humidity is less than 60% (default). If an electric heater is not installed,
the compressor run time will extend by operating to 1°F lower than set point. This cycle continues until the cabin's
relative humidity is less than 60% (default). The range of adjustment is 50% to 80% RH.
For CW applications: (Optional; Factory Default: 60% RH) If the optional humidity sensor is connected to the control
board, this feature allows the system to dehumidify with electric heat (if electric heat is installed and enabled) when the
cabin humidity rises above 60% (default) relative humidity (RH). The electric heater will cycle on and off to maintain set
point while the bypass valve opens to allow cold loop water to enter the air handler coil to dehumidify. This operation
continues until the cabin's relative humidity is less than 60% (default). If an electric heater is not installed, the bypass
valve's on time will extend by operating to 1°F lower than set point. This cycle continues until the cabin's relative
humidity is less than 60% (default). The range of adjustment is 50% to 80% RH.
14
Smart Touch Cabin Control Installation & Operations Manual
Figure 16: Smart Touch
General Settings Page 6 of 8
Figure 17: Smart Touch
General Settings Page 7 of 8
Figure 18: Smart Touch
General Settings Page 8 of 8
L-3380 ENGLISH
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