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Basic Operation
Power On
When AC power is applied to the system at the circuit breaker,
the SMX microprocessor retrieves from permanent memory
the last operating configuration. This process takes about four
seconds, after which the system will begin operating just as it
had been when power was last turned off.
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 10 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 cabin 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 control is calling for cooling (solenoid
valve open and the compressor running). When the cabin
temperature is satisfied, the Cooling Indicator goes off
(solenoid valve is closed and the signal to the compressor
relay is off).
L-0952 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
heat mode and the electric heater is on. When the cabin
temperature is satisfied, the Heating Indicator goes off
(electric heater is off).
Automatic Changeover
Press the COOL and HEAT keys simultaneously for AUTO-
MATIC CHANGEOVER between COOL and HEAT Modes.
The mode indicators will light, indicating 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 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 the manual fan control may be used 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 actual cabin
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.
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