Press for tonight
Hold for immediate
Salt
Set
Level
LEVEL
SALT
ALARM
SALT
LOW SALT
Select
Tank
Light
Recharge
Softener Model Model Code to select
EP31 EP31
EP42 EP42
EPHS EPHS
NSC22 nS22
NSC31 nS31
NSCWC nSAC
7360875 (Rev. B 5/3/18)
RECHARGE
button
Display
ELECTRONIC CONTROL BOARD (PWA) REPLACEMENT
Figure 3
Figure 2
1. Unplug the system’s power supply.
2. Remove the system’s top cover to expose the back of the faceplate
and the valve.
3. Unplug the wiring connections from the back of the old Electronic
Control Board (See Figure 2).
4. Carefully remove the old board by unsnapping it from its retainer tabs.
5. Carefully snap the new Electronic Control Board into the retainer tabs.
6. Reconnect the wiring to the new board (See Fig. 2).
IMPORTANT: BE SURE THE VALVE CAM INDICATES
``SERVICE'' POSITION (See Figure 1) WHEN REPLACING THE
ELECTRONIC CONTROL BOARD (PWA), TO ASSURE BOTH
VALVE AND PWA ARE ORIENTED, OR TIMED, TO THE SAME
CYCLE. If the valve is not in Service position, see step 13 below.
N
OTE: When installing the electronic control board (PWA) on the face-
plate, use care not to twist the circuit board, or force it onto the
mounting pegs. Twisting could damage the printed circuits, or break the
display glass.
9. With the correct model code displayed, press the
SELECT button. The electronic controller will restart,
briefly displaying the model code you set.
10. Press the
r UP or s DOWN buttons to set the
present time. Up moves the display ahead; down
sets the time back. Be sure AM or PM is correct.
NOTE: Press buttons and quickly release to slowly
advance the display. Hold the buttons down for
fast advance.
11. Press the SELECT button a few times, until the time
appears on the display, but is not flashing.
12. For information about programming additional fea -
tures of the softener, consult your owner’s manual.
13. If the valve is not in Service position, press the
RECHARGE button and hold for 3 seconds to start
a recharge cycle. The display will flash
“RECHARGE.” In about 2 hours the recharge cycle
will be complete and the valve and electronic
control board will be properly oriented together.
NOTE: To save time, use the manual advance proce-
dures to properly time and check operation.
See service information in the manual.
7. Plug the power supply into the electrical outlet.
A number shows in the display for a few seconds,
followed by a flashing “- - - -”.
NOTE: If “- - - -” is not flashing in the display, press and
hold the SELECT button until a model code
appears.
8. Use the r UP or s DOWN buttons to select the
correct model code for your softener (see table below).
Back of Electronic
Controller (PWA)
Valve
Motor
Pwr.
In
Motor
Tank
Light
Pos. /
Turbine
120V
AC
60 Hz
Power
Supply
24V DC
Tank Light
Turbine
Sensor
OUT
GND
+5
C
NC
NO
Position
Switch
SELECT button DOWN button
UP button
Position markers
(valve in service)
Cam
Motor
Figure 1
IN
OUT
