Spectra Watermakers Farallon 1800, Инструкция по установке и эксплуатации

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OP-4 FRESH WATER FLUSH
The purpose of the fresh water flush is to replace the sea water in the watermaker with fresh
water whenever the system is not operating. The Auto Flush Mode changes the fresh water
every five days if the system has been idle that long. The watermaker will last longer and
operate better if it is always kept filled with fresh water between uses.
Most spectra watermakers are equipped with a fresh water flush module. This module
includes a charcoal filter to remove any chlorine in the fresh water that might damage the
membrane. The electrically operated solenoid valve opens during the fresh water flush
allowing the boats pressurized water system to supply water to the system. The charcoal
filter has a maximum flow rate of 2 gallons per minute (7.5lpm) so the pump is operated at a
reduced speed to avoid exceeding this flow rate.
If the ship’s water system is unable to provide flush water at the required flow rate, sea water
will be drawn in to make up the difference. This will cause the flush water to be brackish,
and ineffective in preserving the watermaker. 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 Pearson Pump knocks and bangs loudly this means that the fresh water supply is
insufficient. In this case it is very important to either increase the water supply or adjust the
feed pump flush speed as shown in the System Startup instructions.
Because the pre-filters trap the plankton in the feed water they can be subject to “going
anaerobic” or starting to smell like rotten eggs, as the trapped plankton decay. For this
reason it is advisable to always put in clean elements if the unit is going to be left on Auto
Flush Mode. In daily or regular use the fresh water flush after each shutdown will help
prevent this problem, but in excessively warm or fertile waters the pre-filters will need
regular attention.
7/26/04