Spectra Watermakers Farallon 1800, Installation And Operating Manual

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Tank Switch Installation and Operation:
There are two sets of terminals on the MPC-5000 PCB that can be used in four
different configurations to automatically start and stop the watermaker, or to automatically
stop the watermaker when the tank(s) are full without the auto start feature. These terminals
are on the green ten pin connector on the MPC board and are labeled “Float Switch 1” and
“Float Switch 2.” Float Switch 1 is the tank full switch and Float Switch 2 is the tank empty
switch.
While the system is capable of completely automatic operation (starting when the low level
tank switch opens) we do not recommend it as a control failure could fill the boat with water.
That said if you are interested in completely automatic operation please contact technical
support for instructions.
If the owner prefers to utilize the automatic shutoff feature only the tank full switch is used.
A jumper must be placed between the tank empty terminals (Float switch 2) in place of the
tank empty switch, because the watermaker will only shut down if both sets of terminals are
closed. To use this mode the watermaker must be started up with the Auto Fill mode. The
watermaker will fill the tank and automatically enter Auto Store mode.
It is possible to use the auto fill feature with 2 tanks. A double throw electrical switch must
be installed in a convenient location. If only the single tank full switch is installed in each
tank connect the wire from the ‘Float Switch 1’ terminal “1” to the common on the switch
and run separate wires from the switch to each tank switch. The second wires can both be
run to the Float Switch 1 terminal 2. If you are using two switches in each tank you will
need a double pole double throw switch.
See wiring schematics beginning on pg. 45 for detailed drawings.