Smxir Basic Operation Power On; System Off; Selecting Setpoint; Displaying Temperature - Dometic Kohler 7APU Operation And Installation

SMXir Basic Operation
Power On
When AC power is applied to the system at the circuit
breaker, the SMX microprocessor performs a self-check and
retrieves from permanent memory the last operating configu-
ration. This process takes about four seconds, after which
the system will begin operating just as it had been when
power was last turned off.
Note: These systems have a 2-minute compressor restart
delay to allow the system refrigerant pressures to equalize
before starting. This delay begins when the compressor
shuts down for any reason. This delay is increased by the
Compressor Time Delay function so that vehicles with
multiple units can be set to prevent all units from turning on
at the same time if power is lost and restored.

System Off

Press the OFF key to turn the system off. Note that the data
display remains energized even when the system is off. The
fan can be turned on manually when the system is in the off
mode.
Note
The SMX has built-in protection against sudden power
interruptions. The system automatically stores the current
operating configuration in permanent memory every time you
make changes. (The new operation mode must be in affect
for 30 seconds before it is saved into permanent memory.)
When AC power is lost, the SMX system retains these
settings, and when AC power is restored it resumes opera-
tion using the same settings as before.

Selecting Setpoint

Press the SET key and the current setpoint will be displayed.
Press the UP or DOWN key to change the setpoint.

Displaying Temperature

To display room temperature, press the TEMP key. Press
TEMP twice for an alternating display of inside temperature
and setpoint. Press again to return to inside temperature
only.

Cool Mode

To enter the COOL mode, press the COOL key. The Cool
Mode Indicator will light to show that you have selected the
cooling mode.
The Cooling Indicator will be lit whenever the system is in the
cooling mode and the compressor is running. When the
compressor cycles off, the Cooling Indicator goes off, but the
Cool Mode Indicator stays on.
L-2347K Operation

Heat Mode

Press the HEAT key to select HEAT Mode. The Heat Mode
Indicator will light to show that you have selected the heating
mode.
The Heating Indicator will be lit whenever the system is in the
heating mode and the electric heat element is energized.
When the heat element cycles off, the Heating Indicator
goes off, but the Heat Mode Indicator stays on.

Automatic Changeover

Press the COOL and HEAT keys simultaneously for AUTO-
MATIC CHANGEOVER between COOL and HEAT Modes.
Both mode indicators will light, to show that the system is in
the automatic changeover mode.
For the SMXir Remote Control only - Press the Auto
Switchover key to enter automatic changeover mode.
Note that the Cooling or Heating Indicator will come on when
the compressor (or heater) is running to show when the
system is running in the cooling or heating mode.

Manual Fan Speed Control

Press the FAN key to select manual fan control. The Manual
Fan Indicator will light to show that it is in the manual mode.
Then use the SLOW and FAST keys to select the desired fan
speed.
Note that you can use the manual fan control to circulate air
even when the system is in the OFF mode.

Automatic Fan Speed Control

If in manual fan mode, press FAN key to select automatic fan
control. The Manual Fan Indicator goes off, and the system
will automatically adjust fan speed as the room temperature
deviates from the setpoint. As setpoint is approached, the
fan speed automatically slows. Once setpoint is reached, the
compressor cycles off and the fan keeps running on low
speed.

Adjusting Brightness

Pressing the SET key repetitively will dim the LED display.
Keep pressing SET to return to full brightness.

Using The Humidity Control Routine

When engaged, the SMX humidity control routine automati-
cally 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 "Humidity Control Program".
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