18
EN
Operation CapTouch Cabin Control
Parameter Name DX CW Factory Default Parameter Range
P-24
DEHUMIDIFICATION
Mode Minimum
Temperature
x x 50°F (10°C) 40°F to 75°F (4°C to 24°C)
Set the minimum room temperature (in Fahrenheit) for which DEHUMIDIFICATION mode initiates
a cooling cycle to remove moisture from the air. If the room temperature is below this parameter
setting, DEHUMIDIFICATION mode runs a heating cycle. Refer to “Choosing the Control Operation”
on page 11.
P-25
Auto Fan Speed
Temperature Differential
x x 2°F (1°C) 1°F to 3°F (0.6°C to 2°C)
Set the incremental differential (with cumulative steps) between the ambient temperature and the set
point temperature at which the fan speed will increment to the next speed.
I
A 1°F (0.6°C) hysteresis in the auto fan speed differential prevents the speed from changing if
the room temperature changes. In addition, programming parameters P-12 and P-23 both have
an effect on the operation of the auto fan speed.
P-26
Supply Air High
Temperature Limit
x x OFF
OFF
95°F–140°F in 5° increments
(35°C–60°C in 2.8° increments)
Set the maximum supply air-discharge temperature allowed.
• Enabling this parameter has no effect unless parameter P-28 is enabled and set to EnA.
• Use of this parameter requires that the OAT sensor be placed in the supply air stream immediately
downstream of the blower discharge.
• HEAT mode shuts down if the temperature of this sensor exceeds the setting. HEAT mode is
restored when a 10°F (6°C ) hysteresis is satisfied or when power is cycled to the control and the
OAT sensor temperature is less than the setting but still within the hysteresis. SAH is displayed when
this fault occurs.
• Display the discharge temperature by tapping the Up and Down icons simultaneously (same as
viewing the outside air temperature).
P-27 Idle State Delay
x x 10 seconds 5–120 seconds (5-second increments)
Set the delay time before the display enters an idle state. Refer to “Choosing the Control Operation” on
page 11. Use the Up or Down icons to increase or decrease the idle delay time.
P-28 Auxiliary Heat Enable
x x dIS dIS/EnA
Enable the operation of an optional auxiliary electric heater. If an auxiliary electric heater is installed,
change this setting to EnA to allow the auxiliary electric heater to be operated independently of the
reverse-cycle heating. In DX applications, the auxiliary electric heat and compressor outputs on the
control board operate at the same time only when the dehumidification functionality is active. Refer to
“Relative Humidity Enable” in this table.
P-29
Relative Humidity
Enable
x x OFF OFF / 50–80
Enable the optional room temperature/relative humidity combination sensor. This allows the system to
dehumidify using auxiliary electric heat (if an auxiliary electric heater is installed and enabled) when the
cabin humidity rises above the selected relative humidity (RH).
• For DX applications: Relative humidity enabled. If the optional room temperature/relative humidity
combination sensor is connected to the control board and senses that the humidity has increased,
the compressor run time will extend by operating to 1°F lower than the set point to remove the
humidity. If an auxiliary electric heater is installed, it will cycle ON and OFF to maintain the set point
while the compressor stays on longer to dehumidify.
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There could be a period of overlap when the compressor and the auxiliary electric heater are on
at the same time. This cycle continues until the cabin’s relative humidity is less than the humidity
set point. The range of adjustment for the relative humidity is 50% to 80% RH.
• For CW applications: Relative humidity enabled. If the room temperature/relative humidity
combination sensor is connected to the control board, this feature allows the system to dehumidify
with electric heat (if an auxiliary electric heater is installed and enabled) when the cabin humidity
rises above the humidity set point. The auxiliary electric heater will cycle ON and OFF to maintain
the 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 the humidity set
point. If an auxiliary electric heater is not installed, the on time of the bypass valve will extend by
operating to 1°F lower than the set point. This cycle continues until the cabin’s relative humidity is
less than the humidity set point. The range of adjustment for the relative humidity is 50% to 80% RH.
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