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MISC-3 ACCUMULATOR PRESSURE
All Spectra Watermakers except the Newport 700 and 1000 series are supplied with a pressure
accumulator tank, (part no. PL-ACC-TK) to be installed in the feed water line between the pre-
filters and the Clark Pump. In addition, the Catalina 300 and Newport 400 series also have an
accumulator mounted inside the fresh water flush module.
The purpose of the feed line accumulator is to reduce the spikes in the feed pressure caused by
the cycling of the Clark Pump. If the accumulator is not properly charged it can lead to prob-
lems with the ShurFlo pump pressure cutout switches. The accumulators have an air valve on
top similar to those found on car tires. This allows the internal air bladder of the accumulator to
be pre-charged. The accumulator should be pumped up to about 65 psi (4.5 bar) for best re-
sults. Add air using a tire pump or air compressor. You can experiment with the exact pressure
that will give the best pulsation dampening on your installation.
The purpose of the fresh water flush accumulator is to allow a steady flow of 1.5 gallons per
minute of flush water through the charcoal filter. Because the feed pump on the 300 and 400
hundred series exceeds this maximum allowed flow rate, the controller turns it on and off, to
reduce the overall flow rate. The accumulator gives the water flowing through the charcoal fil-
ter somewhere to go while the feed pump is cycled off. The flush water accumulator should be
preloaded to 5 psi (.35 bar).
9/27/04