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• Use the UP or DOWN key to adjust the displayed tem-
perature to the correct value.
• Press OFF to exit the programming mode.
Humidity Control Program
The SMX dehumidification program automatically runs the
air conditioning system for a programmed time period to help
control humidity in the boat. The dehumidification program
works in 3 stages:
1. The fan comes on at high speed to circulate air for 10
minutes.
2. The fan then drops to low speed, and the compressor
cycles on in the cooling mode to dehumidify.
3. After the dehumidification cycle, the system turns off. The
process repeats according to the programmed time
period.
The factory default settings are:
Overall time period ...................... 12 hours
Precirculation cycle ..................... 10 minutes
Dehumidification cycle ............... 30 minutes
The factory settings are adequate for most moderate
climates and boats. For humid climates, you may wish to
shorten the overall time period and extend the dehumidifica-
tion time. In dry climates, you can select longer intervals
between cycles and a shorter dehumidification time.
Programming The Time Period
(Factory Default: 12 hours)
The time period determines how often the system performs
the dehumidification process. You can select intervals of 2, 4,
6, 8, 10, 12, 14 or 16 hours. Chose a shorter time period in
climates with high humidity.
To select time period:
• Enter the programming mode: Press OFF, Press SET
• Press TEMP and UP simultaneously. The display will
show the overall time period in hours.
• Use the UP or DOWN key to select the desired time
period.
• Press OFF to exit the programming mode.
L-0952 Operation
Programming The
Dehumidification Time
(Factory Default: 30 minutes)
The dehumidification time determines how long the com-
pressor runs in the dehumidification mode. You can select
10, 20, 30, 40, 50 or 60 minutes. Select a longer dehumidifi-
cation time in humid climates.
To select dehumidification time:
• Enter the programming mode: Press OFF, Press SET
• Press TEMP and SET simultaneously. The display will
show the time period in minutes.
• Use the UP or DOWN key to select the desired time
period.
• Press OFF to exit the programming mode.
Recommended Humidity Control Settings
Fault Shutdowns and Error Messages
The SMX control contains a built-in self-check routine
described below.
Software Error
Whenever power is applied to the SMX, the microprocessor
goes through an automatic self-check and software loading
process. If all is well, the SMX loads the most recent operat-
ing configuration from its internal memory, and turns on
normally. If a program fault is found during the self-check, the
error message "PE" (Program Error) will be displayed.
Likewise, the self-diagnostic routine runs continuously
whenever the SMX system is on. If a system fault is de-
tected, the system shuts down, and the "PE" error message
appears.
If this message occurs, contact your nearest Cruisair dealer,
or call the Factory Service Department in Richmond, Virginia
(804-746-1313) for assistance.
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