SCAD SensiStat Manual

HOW IT WORKS......................................... 1
INSTALLATION .......................................... 2
OPERATION ............................................... 4
CUSTOMIZATION / PROGRAMMING........ 7
TROUBLE SHOOTING ............................. 12
MY SENSISTAT CUSTOM SETTINGS..... 14
FACEPLATE TEMPLATE......................... 15
The SCAD SensiStat™ Energy Saver refrigeration controller works with your 12 or 24-volt
holding (aka holdover) plate refrigeration system and reduces your battery usage by:
•
Providing extremely precise thermal control thus reducing excess running of your
refrigeration compressor
•
Automatically utilizing available "excess" power while your batteries are charging.
This reduces the amount of battery energy used each day for refrigeration and
saves you hours of battery charging time each week. This savings translates to
real dollars as you will use less fuel for battery charging and reduce wear-and-
tear on your engine or generator.
NOTE: If you connect power to your SensiStat while the temperature probes are above 16
degrees F, after two minutes, the high temperature alarm will sound and "E04" will be
displayed. This is normal and correct behavior. To mute the beeping, press the PRG key
briefly. To adjust the high temperature alarm threshold, delay, or to disable the high
temperature alarm, refer to the high temperature alarm section of this manual.
HOW IT WORKS
A typical thermostat turns on your refrigeration compressor to freeze holding plates solid.
The plates are then allowed to defrost to a temperature approximately 8
the compressor is turned on again and the plates are refrozen. The difference between
the freezing temperature and the "defrosted" temperature is known as hysteresis or
differential. This is the most energy efficient method and the more precise the control, the
more efficient the system and the more likely your ice cream will remain solid. The
SensiStat refrigeration controller, with a resolution of 1/10
precision of control. What's more, the SensiStat comes with temperature sensors to allow
you to monitor and display both the holding plate temperature and refrigeration box
temperature.
Normal thermostats also do not take advantage of randomly available "free" or "excess"
power provided whenever your engine or generator are running and charging your
batteries. Since batteries can only charge so fast, there is normally plenty of extra
generation capacity available to run your refrigeration system "for free", that is using
energy without depleting your batteries. When the SensiStat refrigeration controller
detects charging level voltages, it closes down the hysteresis to only 1
available free power to "top-up" the freeze on your holding plates. For example, when you
are motoring into an anchorage at the end of the day, the SensiStat will automatically run
your refrigeration compressor while your engine is running and save you all the battery
© 2009 SCAD Technologies LLC • www.scadtech.com
SensiStat™ Energy Saver
Refrigeration Controller
Revision 2.05
(
Applies to SensiStat Revision 2.x products)
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F higher before
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F provides unparalleled
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F and uses the
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