6
Figure 5 - Conductivity Probe Installation
1 Drill the enclosure as needed and install liquid-
tight fittings for the wiring.
NOTE:
The Controller can be ordered
pre-drilled or with fittings installed, or with
fittings and wiring installed. Contact Nelsen
Corporation for details.
2 Mount the enclosure in the desired location on
the RO system.
3 Bring the wires from the peripheral devices
into the enclosure and connect them to the
appropriate terminals. (See Figure 1, Figure 3 and
Figure 4.)
4 Set the voltage selector switch on the Terminal
Board to the desired voltage (120VAC or 240VAC)
(See Figure 4.)
Controller Power Fuse Values
.5 HP .75 HP 1 HP
2 HP
120 VAC
12 A
20 A
20A
N/A
240 VAC
-
-
6 A
12 A
7 Connect the conductivity cell to the terminals on
the CPU Board. (See Figure 3)
8 Provide power to the RO system.
9 Press the System On/Off switch to turn the
system ON.
10 Select the Program Mode (See Figure 6 and Table
2). The default is Program 1 which is a general
purpose setting. Use Program 2 if your system is
not equipped with a flush valve.
NOTE:
The Program Settings can be
customized to suit the specific needs
of an OEM and pre-programmed at the
factory with your settings. Contact Nelsen
Corporation for details.
11 Make any other changes you want to the
settings. Press System On/Off to save your
changes.
12 The controller is now ready for service.
NOTE:
If using a single point High Level RO
water shut off/liquid level control, you need
to install a Jumper wire on the Terminal strip
from E24 to E26. Connect the float switch
wires to terminals E23 and E26. Connection
E25 is empty...no wire connection.
5 Install the correct power fuse for your voltage/
motor HP. See the table below and Figure 4.
6 Install the conductivity cell in the permeate line.
(See Figure 5 for conductivity cell installation
instructions.)
Installation
Install the Conductivity Probe in the “Run”
of a Tee or equivalent location. Orient the
probe so that air can not become trapped in
the area near the probe.
FL
OW
FLOW
Conductivity
Probe
