Tomar TV-6000, Owner'S Manual

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2.4 SYSTEM CONTROLLER
This system is equipped with a microprocessor controller which monitors several functional condi-
tions and regulates operation of the high pressure pump and control valves. The controller is con-
nected to sensors which, depending on their state, allow the cyclic production of purified water or
prevent operation due to abnormal conditions.
Standard Configuration
In the standard configuration the following parameters are monitored and affect system operation:
Feed Water Supply Pressure.
The feed water pressure sensor must detect a pressure of at least 22 psi (1.5 kpa) at the outlet of
the system prefilter before the controller will allow the system to start. If the feed water pressure
drops below 12 psi (0.8 kpa) during system operation the controller will shut down product water
production. After a one minute delay the controller will restart if the feed pressure has risen to 22 psi
(1.5 kpa) or higher. If the restart fails for three attempts the controller will cease trying and remain in
the standby state and display the ALA message. The OFF-POWER-ON switch must then be turned
to OFF and then ON to reset the controller
Product Water Storage Tank Level.
The controller should be connected to a “normally closed” or “pump up” type of tank float switch.
The contacts in this switch will be in the closed state whenever the tank water level is below the full
level. When the full level is reached, the contacts should switch to open state. The controller will
turn the system on to produce water as long as this switch indicates that the product water tank is
not full and as long as the other sensor inputs are in a normal state.
Product Water Conductivity.
The controller is connected to a product water conductivity sensor located near the product water
outlet connector. The conductivity measurement value will be shown in the controller display during
normal operation. If the conductivity value exceeds a preset maximum level the HIGH indicator will
light red on the front panel.
Optional Configurations
The system controller may also be monitoring the following optional parameters depending on the
options included in the specific system.
Low Feed Water Tank Level
In certain configurations, feed water to the system is supplied by a boost pump drawing from a feed
water storage tank. If the proper float switch is installed in this tank the system controller will monitor
this switch and if the feed tank level drops below the minimum level the controller will shut down the
R.O. system including the boost pump.
High Vessel In Pressure
In certain configurations, particularly with sea water systems which employ a high pressure positive
displacement pump, a pressure switch is installed on the high pressure pump outlet. If the pump
output pressure exceeds the trip setting of the pressure switch the controller will shut down the R.O.
system and display the ALA alarm indication.
Membrane Flush
If the membrane flush option is installed the controller will execute either a feed water fast flush or a
product water flush, depending on the selected configuration. The flush mode can be selected for
occurrence at either startup or shutdown, or at both startup and shutdown. Refer to the Flush Mode
setting instructions later in this manual in paragraph 3.2.3.
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