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English
L-2066 Operation
Compressor Time Delay
(Factory Default: 0 seconds)
This function is used when you have more than one unit on
board. To prevent electrical overload due to multiple
compressors starting when turning on power to the system,
or when power is interrupted, each SMX unit should be
programmed with a different time delay.
Time delay can be set in increments of 1 second. On older
systems (before 8/98) the time delay is set in 10-second
increments, up to 70 seconds.
To program time delay, go to each SMX switch, and follow
these steps:
• Enter the programming mode: Press OFF, Press SET
• Press DOWN, SET and UP simultaneously. The delay in
seconds will be displayed.
• Use the UP or DOWN keys to change the time to the
desired setting.
• Press OFF to exit the programming mode.
At initial power-up, you will see the countdown for each
compressor on the data display, if you are in the TEMP
mode. The countdown will not appear in the SET mode.
Fahrenheit/Celsius
Display
(Factory Default: Fahrenheit)
You can choose to view temperature in degrees Fahrenheit
or Celsius.
To select Fahrenheit or Celsius:
• Enter the programming mode: Press OFF, Press SET
• Press DOWN, TEMP and UP simultaneously.
• Use the UP or DOWN key to select F for Fahrenheit or C
for Celsius.
• Press OFF to exit programming mode.
Note
If you switch from Fahrenheit to Celsius for temperature
displays, the compressor restart differential will also oper-
ate on degrees Celsius. Thus, the factory-set compressor
restart differential will be 1.5° Celsius, which is too wide. To
correct this, reset the differential value from 12 to 6. This
will provide a differential of 0.75° C, or about 1.4° F.
This will also affect the Fan Response Differential, which is
factory set at a value of 4, or 0.5° Fahrenheit. When chang-
ing from Fahrenheit to Celsius, you should reset the Fan
Response Differential from 4 to 2. This will provide a fan
differential of 0.25° C, or about 0.5° F.
Compressor Differential
(Factory Default: 12 = 1.5°)
The compressor differential is the temperature change
needed for the compressor to cycle on and off. The factory
setting of 1.5° Fahrenheit should be adequate for most
applications. Differential selections are available in incre-
ments of 1/8°. Thus, to select one degree, you should
choose 8 (for 8-eighths).
To program the compressor differential:
• Enter the programming mode: Press OFF, Press SET
• Press SLOW and FAN simultaneously. The restart
differential will be displayed.
• Use the UP or DOWN key to change the setting.
• Press OFF to exit the programming mode.
Hint
Be careful not to set your compressor restart differential too
low, since it will cause the compressor to start and stop
quite often. This will place an undue load on your electrical
system and also wear out your compressor faster.
Fan Response Differential
(Factory Default: 4 = 0.5°)
When the fan is in the automatic mode, its speed is
governed by how far the room temperature differs from the
setpoint. The fan runs faster when the difference is great.
As the room cools or warms, the temperature approaches
setpoint, and the fan slows down automatically. The amount
of temperature rise in the room above setpoint needed to
cause the fan to increase in speed one step is called “fan
speed differential”. It can be adjusted from 1/4° to 4°, in
1/8° increments.
The fan speed range is divided by the SMX microprocessor
in five equal increments. If the fan response differential is
set at 1/2°, the fan speed will change 20% for each 1/2° of
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.
Содержание Cruisair SMX II
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