Spectra Watermakers NEWPORT 400 Mk II, Installation & Owner'S Manual

Page: 28 / 62

28
Flush Cycle Adjustment
Before shippi n g fro m the factory the N ewport water maker flush cycle is s et to fa ctory default s ettin gs. Af-
ter initial start up, and a n nually the reafter, t he flush cycle should be checked. The water goi n g overboard at
the end o f the flus h cycle should not taste salty (<1000pp m). I f the water at the e nd of t he flush is still
salty, or to min i mize t he use of fresh water during t he flush cycle, follow these instructions to optimi ze the
cycle.
First adjust the f lush water p ressure regulato r . Remove the 1/2 inch vinyl flush water hose where it
attaches to the flush water inlet fitt i n g at the feed pump module. Push the Auto store button. Water will
begi n to flow out of t he flush water tube. Using a graduated contai ner , allow t he water to flo w into t he con -
tainer for exactly thirty seconds, the n push the stop button. If more tha n 3 quarts (3 liters) of water went
into the bucket the pres sure regulator is s et too hig h , if les s the 2.5 quarts went into the bucket the pres sure
is too low. Adjust the re gulator by loosen i n g t he lock nut a nd tur n i n g t he adjustin g screw. Test again u nti l
the correct flow is achieved. Reconnect the Flush water tube.
Next adjust the feed pum p flush speed . Mounted under the top of the Feed Pump Module, under the
MPC box , is a pump speed controlle r. On t he board are two ma g netic switc hes for adjustin g t he pu mp mo -
tor rpm. The switches are narrow silver colored bars about 1/2” (1.5cm) lon g. The Inc rease Speed switch
is labeled S2 and is located in the cor ner opposite t he battery cables. The Decreas e Speed switch is labeled
S3 and is located just above the battery cable s and next to the 6 capa citors. Each time a small mag net is
placed near the switch w hile t he pump is run ni n g , a signal will be sent to the controlle r, cha n gi n g t he speed
settin g, and t he pump will speed up or slow dow n slig htly.
Adjust the flush speed a s follows. Push the Auto Store button. Push the Alar m display button unti l
the display reads PREF I LT ER GOOD R EP LACE. The flus h valve will ope n a nd water wil l flo w back-
wards throu g h the filters and strainers. After about 30 seconds the backflush will end and the feed pump
will come on , startin g the for ward flush of the Clark Pump and membra ne. After the feed pump starts,
close the s ervice v alve (handle crossways) or the thru - hul l. If the bar grap h on t he display begins to move
toward R EP LAC E on t he gau ge t he feed pump is tryin g to pu mp mo re water t ha n the Flus h modu le can
supply, and should be slo wed dow n. Turn t he service valve to Service. Water should flo w very slowly ou t
of the garde n hose fitti n g. If f low is more t ha n a trickle, speed up the pump. Opti mu m flus h speed will be
the speed at whic h slig htly more water is comi n g fro m the flus h module tha n t he feed pump is pumpin g.
This settin g wil l ensure t hat no sea water is draw n i n duri n g t he flus h, but f resh water is not bei n g wasted
overboard.
Adj ust the Pump Of f time an d Pump On t ime. The flush begi ns and ends wit h the Pu mp Off Time set -
tin g. Pump off time should be set so that the feed pump comes on just as fresh water reaches the se a cock.
Pump on ti me should be adjusted so that the pump runs just long enou g h for Fresh water to reach the brine
overboard fitti n g, t he n stops. Pump O n and Pu mp Off ti mes can be adjusted fro m t he laptop computer o r
the display. See the instructio ns in Section 2. Flu sh duration must be set the same as or hig her tha n t he
total flush time (t wo pump off ti mes plus one pump on ti me).
Pressure regulator
I ncrease speed
switch
Decrease
Speed
switch