Spectra Watermakers CATALINA 300 MPC-5000, Installation & Owner'S Manual

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Automatic Fresh Water Flush Cycle
Warning! Proper understanding of the Spectra flush system and the vessel’s fresh water sys-
tem configuration is mandatory for extended automatic flush cycles. The flush cycle must not
be allowed to drain all the fresh water from the vessel, or damage to the vessel’s systems may
occur.
Make sure there is enough water in the fresh water supply system to supply the watermaker
for more than the expected time of operation in the “re-flush every 5 days” mode. The Catalina
300 requires 3 gallons (12 liters) every 5 days.
Make sure that the
pressure water supply is on and will stay on during the flush mode (If
this is not possible contact your certified dealer.).
Make sure that the
pressure relief valve is closed . It should be closed if the system was just
used to make water. The auto flush may not operate if the valve is open.
The power for the system must remain on during the auto flush mode. Turning off the power
will disable the auto flush function and damage may occur.
Pressing the “Auto Store” button momentarily will start a flush and then activate the 5 day
flush cycle. The feed pump will start, the flush water solenoid will open and the display will
read “
Fresh Water Flush ” with a countdown timer. After 5-7 minutes the pump will stop, the
display will read “ Flush Timer Interval ,” and the countdown timer will reflect the number of
hours until the next flush.
Pressing and holding the “Auto Store” button for 3 seconds will engage one-time flush. The
system flushes as described above, but will not re-flush every 5 days. Display will read “
Fresh
Water Flush ” with a countdown timer, then go into standby mode when finished.
Pressing the Stop button will cancel the auto flush mode.
Checking the Flush Cycle
The length of time the flush cycle lasts, and the on time and off time for which the feed pump
runs, are preset to nominal values at the factory.
After the installation is complete the flush cycle must be checked to ensure that no salt or brack-
ish water remains in the system after the flush cycle is completed. Salt remaining in the feed
pump will cause rapid deterioration of the pump’s internals, and the nutrients found in sea wa-
ter will allow rapid microbial growth in the membrane.
If the ship’s water system is unable to provide flush water at the required flow rate, or the feed
pump is running too fast during the flush cycle, sea water will be drawn in to make up the dif-
ference. At initial startup the fresh water flush system should be tested by taking a sample of
the brine discharge water just as the flush cycle is ending. This water should not taste salty, and
should read less than 1000 ppm on a digital tds meter. The flush cycle can also be tested by
closing the sea cock during the flush cycle. If the MPC-5000 display gives a CK SEA
STRAINER alarm this means that salt water was being drawn in. If this is the case the water
supply should be increased if possible. Otherwise, the feed pump on and off times should be
adjusted and the flush duration increased increased if necessary.
Instructions for adjusting the flush parameters can be found in Part 2 of this manual.