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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 dif-
ferent 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 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.
If the unit is wired for both Autostart and Autostop, it can be put into AutoFill Mode by
pushing and holding the Auto Run switch on the MPC-5000 display. In this mode the water-
maker will start whenever the water level drops below the tank empty switch, so that it is
open (not conducting electricity). When the tank fills up and both the tank full switch and
the tank empty switch have remained closed for two minutes, the watermaker will shut down
and flush itself. The water maker will start back up when the water level drops below the
tank empty switch and it remains open for 2 minutes. This configuration allows for com-
pletely automatic operation. If the watermaker does not need to start up within five days it
will automatically do a fresh water flush. AutoFill mode can be ended by pushing the stop
button or the Autoflush button. If the watermaker is in Autorun mode it can be put into
Autofill mode without stopping it by holding down the Autorun button.
If the owner prefers to install the automatic shutoff feature without the automatic start up
option, 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 Stop/start button or the Autorun button. After the unit starts up, then
press and hold the Autorun button until the display reads “Auto Fill Mode”. The water-
maker will fill the tank and automatically enter Autoflush mode.
It is possible to use the autofill 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.