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temperature deviation from setpoint. Lowering the fan speed
differential will cause the fan to increase speed quickly as
temperature changes. Raising the fan speed differential will
result in slower fan speed changes for a given temperature
change. The factory setting of 1/2° Fahrenheit is good for
most applications, but you may wish to try a slightly higher
setting in your salon and a lower setting in your stateroom.
To adjust fan response differential:
• Enter the programming mode: Press OFF, Press SET
• Press COOL and SLOW. The differential will be displayed
in increments of 1/8°.
• Use the UP or DOWN key to raise or lower this value.
• Press OFF to exit the programming mode.
Note
On SMX II systems built before 8/98, press SLOW, FAN and
FAST simultaneously to adjust fan response differential.
Continuous Or
Intermittent Fan
(Factory Default: Continuous)
You can select continuous fan operation or instruct the fan to
cycle on and off intermittently with the system compressor.
To select continuous or intermittent fan:
• Enter the programming mode: Press OFF, Press SET
• Press DOWN, FAN and UP simultaneously.
• Use the UP or DOWN key to select C (continuous) or
I (intermittent).
• Press OFF to exit the programming mode.
Hint
If you select intermittent fan operation, you should relocate the
thermistor from the return air duct to an inside wall to best
sense room temperature. Check with your dealer or call the
Cruisair Applications Department for more information.
Low Fan Speed Adjustment
(Factory Default: 32)
You can adjust the lowest fan speed to suit individual
preferences. For instance, you may wish to decrease the low
fan speed setting in your stateroom to minimize fan noise.
To adjust low fan speed:
• Enter the programming mode: Press OFF, Press SET
• Press DOWN and SET simultaneously. The current low
speed reference number will be displayed (factory set
at 32).
L-0952 Operation
• Press UP or DOWN to raise or lower speed reference
number.
• Press OFF to exit the programming mode.
Hint
You should normally keep the low fan speed at the highest
possible setting, consistent with a comfortable noise level, for
most efficient operation of your Cruisair system.
High Fan Speed Adjustment
(Factory Default: 60)
A blower will often reach its highest speed at a voltage lower
than full line voltage. For example, at a line voltage of 120V,
the blower might reach its fastest speed at 110V. At higher
voltages, the bower speed will not increase significantly.
The SMX High Fan Speed Adjustment allows you to set the
maximum high-speed voltage to the threshold of the blower
high-speed response (i.e., 110V). Because SMX breaks up
the fan speed voltage steps into 5 equal parts (between the
low-speed and high-speed adjustments), accurately setting
the high-speed adjustment can help ensure that each fan
speed step results in a noticeable change of fan speed.
To adjust the high fan speed:
• Enter the programming mode: Press OFF, Press SET
• Press SET and SLOW simultaneously. The current high-
speed reference number will be displayed (factory default
is 60).
• While listening to the fan noise level, use the UP key to
raise the displayed value past the point that you can hear
an increase in the fan noise level.
• Press the DOWN key to lower the voltage until you hear a
drop in fan speed, then raise that number up by 2 or 3 to
ensure that it is set at the highest speed.
• Press OFF to exit the programming mode.
Temperature Calibration
Typically, the temperature sensor is within 1 or 2 degrees of
actual room temperature. If the sensor is out of calibration, it
can be adjusted to read actual temperature.
To calibrate the thermistor:
• Enter the programming mode: Press OFF, Press SET
• Press SET and UP simultaneously. The sensed tempera-
ture will be displayed.
• Place an accurate thermometer beside the thermistor you
are using and compare the temperatures.
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