16
EN
Operation
Universal Air Conditioning Unit
• Down button –
Press and release to display the set
point. Press and hold the Down button to decrease
the set point. The set point decreases one degree
each time the button is pressed.
• Fan button –
Press to select the Automatic Fan
Mode, the Manual Fan Mode, or to advance through
the manual fan speeds.
• Display Outside Temperature (optional) –
Press the Fan and Down buttons simultaneously
to display the outside temperature (optional). If
the outside temperature is not available, open or
shorted (closed), the display flashes ”- -” instead
of a temperature reading. Press the Fan and Down
buttons simultaneously to display the outside
temperature (optional). If outside temperature is
not available, open or shorted (closed), the display
flashes “- -” instead of a temperature reading.
7 .2 Normal Heating or Cooling
Cycle
If you select Cool Mode, only cooling is supplied. If
you select Heat, only heat is supplied. The conditioned
space temperature in either mode is maintained within
the compressor differential setting.
During a Cooling or Heating cycle, the fan will operate
at a fan speed depending on the fan’s operational
mode. If a Manual fan speed is selected, the fan will
operate at this speed at all times, even if the set point
has been satisfied and the cooling or heating cycle
has ended. If the fan is in Auto mode, the fan speed
will be determined by programmable function 4, the
Fan Response Differential, and programmable function
22, Fan-Speed Divisions. Refer to these parameters
for further details on the fan speeds during Auto fan
operation. When in Auto fan mode, the fan speed will
return to low speed once the set point temperature
has been satisfied and the cooling or heating cycle has
ended.
7 .3 Modes and Programmable
Functions
This section provides the detailed information about
each mode.
7 .3 .1 Power On and Basic Modes
Press the Mode button to turn the system on. In three
seconds, the system will start operating in whichever
mode it was running prior to the last shut down. For
the initial startup, the control will be in Cool Mode. To
change modes before the system starts, press the Mode
button before the three-second startup completes (while
the display is flashing). Or, while the system is on, press
the Mode button at any time to change the mode.
The modes available are:
• Off
• Cool
• Heat
• Auto (automatically switches between Cool and Heat
Modes, depending on set point requirements)
• Dehumidification Mode
7 .3 .2 Dehumidification Mode
Press the Mode button until the Dehumidify LED
indicator illuminates. The display flashes “HU” during
this mode of operation. When Dehumidification
Mode is activated, the Humidity Control Program
automatically turns the air conditioning system on at
timed intervals to remove moisture from the air. The
system is programmed at the factory for average
values. To change the factory settings, see “10:
Dehumidification Pre-Circulation Time” on page 21,
“11: Dehumidification Time” on page 21, and “12:
Dehumidification Overall Time Period” on page 21.
I
When the system is in Dehumidification Mode,
all system safeguard controls remain active. For
example, if the line voltage falls below preset limits,
the system will automatically shut down. If the AC
power is interrupted, the system will automatically
resume operation in Dehumidification Mode when
power is restored.
