SENTRY II 940ST Series User manual

Single Timeclock Water Softening System
Operation and Maintenance Manual
Series 940ST

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Table of Contents
System Specifications and Warnings .............................................................................. 4
Installation Instructions .................................................................................................... 5
Start-Up Instructions ....................................................................................................... 11
Series 940 Control Valve Programming ........................................................................ 13
Parts Breakdown
Front Cover and Drive Assembly ........................................................................... 20
Main Body Internal Parts ........................................................................................ 21
Injector Housing Assembly .................................................................................... 22
Brine Elbow Refill Flow Assembly and Refill Port Plug ....................................... 23
Drain Line Assembly ............................................................................................... 24
1” Drain Assembly ................................................................................................... 25
Bypass Breakdown ................................................................................................. 26
Bypass Valve Operation ......................................................................................... 27
Installation Fitting Assemblies ............................................................................... 28
Brine Tank Assembly .............................................................................................. 30
System Specifications ............................................................................................ 31
Service Instructions ........................................................................................................ 33
Troubleshooting for the Control Valve .......................................................................... 39
Manufacturer’s Warranty ................................................................................................ 43

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System Specifications
Water pressure: 40 psi minimum 100 psi Maximum
Water Temperature: 40°F to 110°F
Electrical Requirements:
Supply Voltage: 120V
Supply Frequency: 60Hz
Output Voltage: 12V AC
Output Current: Maximum 3.0 Amps
Control Valve to Tank Connection: 2.5”-8UN
Control Valve Distributor Pipe Connection: 1.05”
Circuit Board Memory: NonVolatile EEPROM (Electrical Erasable Programmable Read Only Memory)
Compatible with the following typical concentrations of regenerant chemicals: Sodium Chloride, Potassium
Chloride, Potassium Permangenate, Sodium Bisulfite, Chlorine and Chloramines
Warnings
The control valve and fittings are not designed to support the weight of the system or the
plumbing.
Do not use Vaseline, oils, other hydrocarbon lubricants or spray silicone anywhere. A
silicone lubricant may be used on black O-rings.
Hydrocarbons such as kerosene, benzene, gasoline, etc., may damage products that
contain O-rings or plastic components. Exposure to such hydrocarbons may cause the
products to leak. Do not use the product(s) contained in this document on water supplies
that contain hydrocarbons such as kerosene, benzene, gasoline, etc.
The water meter should not be used as the primary monitoring device for critical or health
effect applications.
Do not use pipe dope or other sealants on threads. Teflon tape is recommended to be
used on all threads. Use of pipe dope may break down the plastics in the control valve.
System Specifications and Warnings

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Installation Instructions
Installation
Instructions

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Installation Instructions
Pre-Installation Checklist
1. A standard electrical outlet (120V/160Hz) must be located within 12’ of installation
site.
2. A functioning floor drain, washer sand pipe or suitable location for waste water
discharge must be located within 20’ of installation site.
a. All plumbing should be done in accordance with local plumbing codes. The
pipe size for the drain line should be a minimum of 1/2”. Backwash flow rates
in excess of 7 gpm or length in excess of 20’ require 3/4” drain line.
3. A working pressure reducing valve must be installed on the inlet water line that
supplies the water softener.
4. (Note: The warranty is void if the system is exposed to water pressure in
excess of 100 psi.)
5. The temperature at the location of the water softener system must never be below
40˚F.
Installation
1. Floor Space: Make sure the floor space that has been selected to install the
water softener is clean and on a level surface.
2. Leveling the Salt Container: If the floor beneath the salt container is not level,
do not use shims or spacers to level the salt container. A platform that supports
the entire bottom surface of the salt container must be used.
3. What to Bypass: A typical installation would include bypassing the outside hose
bibs. The cold water feeding the kitchen sink may or may not be bypassed
depending upon preference.
4. Connection Kit: The standard connection kit supplied with the water softener will
be a 3/4" brass sweat connection kit. (See Figure 1) Other connection kits are
available. This kit will consist of the following:

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Installation Instructions
5. Plumbing Preparations: Unscrew the two plastic nuts (#1) and pull on the two
brass connectors (#4) to remove them from the bypass assembly. Next remove the
white plastic rings (#2) and the O-rings. (#3) See Figure 1
•Solder at least 6” of pipe to the brass connectors before reassembly.
(See Figure 2)
•After soldering is complete, cool the pipe and connectors. Slide the
plastic nuts (#1) over the brass connectors (#4). Place the white plastic
split rings (#2) into the grooves closest to the end of the brass
connectors (#4). Reassembly the connection kit onto the bypass
assembly.
Warning: When assembling the installation-fitting package (inlet and outlet), connect the fitting to the
plumbing system first and then attach the nut, split ring and O-ring. Heat from soldering or sol- vent cements
may damage the nut, split ring or o- ring. Solder joints should be cool and solvent cements should be set
before installing the nut, split ring and O-ring. Avoid getting primer and solvent cement on any part of the O-
rings, split rings, bypass valve or control valve.
6. Plumbing: When connecting the water softener to the existing plumbing, make
sure the inlet water is connected to the inlet of the softener. Arrows on the valve body
indicate direction of flow. Make sure the bypass valves are in the correct position See
Figure 3.
Note: All plumbing should be done in accordance with local plumbing codes.
Warning: The control valve, fittings and/or bypass are designed to accommodate minor plumbing
mis-alignments but are not designed to support the weight of a system or the plumbing.
Figure 1
Figure 2
Figure 3

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Installation Instructions
7. Locate Polytube Insert and Drain Nut:Now that the water softener is connected
to the existing plumbing, the drain line may be connected. First, locate the polytube
insert (#2) and the Drain Nut (#3).
8. Connecting the Drain Line: Slide plastic nut (#3) over the permanent drain
tubing and place the polytube insert (#2) into the end of the drain tubing. Insert the
drain tubing into the drain elbow fitting (#4) and tighten plastic nut (#3) hand-tight
plus 1/2 turn with pliers. Caution: Do Not Over-tighten. (See Figure 4)
9. Drain Line Specs: If the distance from the water softener to the drain is greater
than 20’ the drain line size must be increased to 3/4”. The threads on the drain elbow
fitting are 3/4” male NPT and can be used in lieu of the 1/2” plastic nut and insert. If
the drain line must run overhead, the maximum height of the drain line should not
exceed 8’ above the top of the water softener.
10. Air Gap: The drain line must have an approved air gap to prevent the possibility
of a cross connection to the sewer. (See Figure 5)
Figure 4
Figure 5

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Installation Instructions
11. Connecting the overflow line: The brine overflow fitting is located on the
outside of the salt container approximately 12” down from the top. Connect 1/2” drain
tubing to the overflow fitting and run it to the nearest floor drain. This line is a gravity
flow line and cannot be run overhead or cannot connect to a drain that is higher than
the overflow fitting.
12. Connecting the brine line (Figure 6): A 3/8” brine line approximately 4’ long is
attached to the salt container and is supplied with the tube insert in the end of the
brine line. Insert the brine line into the brine fitting (#3) firmly making sure that it is
fully seated. You will notice some resistance when the brine line encounters the o-
ring inside of the brine elbow. Caution: If the brine line is not inserted completely, the
tubing will leak from this point. Verify that there are no leaks during the start-up
procedure.
The water softener is equipped with a 15-foot power cord with built-in transformer. Plug the
power cord into a standard (120V 60Hz) electrical outlet. It will take approximately 10
seconds before you will see the display (this is normal). The water softener is now ready to
be programmed.
Figure 6

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To begin, place the bypass in the position shown in Figure 1.
Place the softener in the Backwash cycle.
•To place the softener in the Backwash cycle press
and hold the UP ARROW and the DOWN ARROW
buttons at the same time (approx. 6 seconds) until the
control valve initiates a regeneration cycle. The
softener is now in the Backwash cycle. An initial burst
of air will be released to the drain. Leave the unit in
the Backwash cycle until the water running to the
drain runs clear.
•Press the UP ARROW button to advance the
controller to the next cycle. The softener is now in the
Brine/Slow Rinse cycle.
•When the timer begins countdown press the UP
ARROW button to advance the controller to the next
cycle. The softener is now in the 2nd Backwash
cycle.
•When the timer begins countdown press the UP
ARROW button to advance the controller to the next
cycle. The softener is now in the Fast Rinse cycle.
Leave the unit in the Fast Rinse cycle for at least five
minutes.
•While the system is in the Fast Rinse Cycle, manually
fill the brine tank with fresh water until there is
approximately 2” of water above the false bottom.
•Press the UP ARROW button to advance the
controller to the next cycle. The softener is now in the
Brine Tank Fill cycle. Leave the unit in the Brine Tank
Fill cycle for at least one minute. This will ensure that
there is no air trapped in the brine tubing and valve.
IMPORTANT:
After the unit has filled for approximately 1
minute, raise the float to shut off the flow of water
and then check the float valve, brine tubing and
connections for leaks.
•Press the UP ARROW button to advance the
controller to the home position.
•Salt may be placed in the unit at this time.
To complete the Start-up procedure place bypass in the
position shown in Figure 2
Start-Up Instructions
Figure 1
Figure 2

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Control Valve Programming
Series 940
Control Valve Programming

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Control Valve Programming
Setting the Time of Day
Your unit will come with the correct time setting when a water technician installs it. After
that, time of day should only need to be set if there is a power outage or when daylight
saving time begins or
ends. If an extended power outage occurs the time of day will flash
indicating that it needs to be reset.
Step 1:
Press SET button and hold for
approximately 6 seconds. The hour display
will be flashing.
Step 2:
Set the correct hour by pressing
either the UP or the DOWN arrow buttons.
The PM indicator arrow will appear when the
hour reaches 12 PM.
Step 3:
Press SET button again to set the
minutes. The minute display will then flash.
Adjust the minutes using the UP or the DOWN
arrow buttons.
Step 4:
Press SET to complete.
The time of day is now set.

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Control Valve Programming
Setting the Regeneration Time
Step 1:
Press and hold the SET button and the UP arrow button at the same time (See
Fig. 1) for approximately 6 seconds to access the regeneration time setting. The hour
will begin flashing.
Hour
Minutes
Step 2: The hour will be flashing. Set the hour using the UP and DOWN arrows. (See
Fig. 2) This will set what hour regeneration begins. Press SET to go to the next step.
Step 3:
The minutes will be flashing. Set the minutes by using the UP and DOWN
arrows. Press SET to complete the regeneration time setting and to continue on to
program the regeneration frequency settings. (SEE NEXT PAGE)
The regeneration time has been set.
(Figure 1)
(Figure 2)

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Control Valve Programming
Step 1:
Adjust the regeneration frequency by pressing the UP or DOWN arrows.
Step 2:
To complete, press the SET button. The display will return to the current
time of day. It will no longer be flashing.
Example:
1 = Every day
2 = Every other day
3 = Every third day
4 = Every fourth day
Etc.
The number of days between regeneration will vary
based on usage and water conditions. Ask your dealer
for recommendations.
Note: When the system is operating, one of two displays will be shown, the current
time of day or the days until the next regeneration cycle. Pressing the UP or the
DOWN arrow buttons will alternate between the two displays.
Regeneration frequency setting is complete.
Congratulations! Your Water Softening System has been programmed.
Setting the Regeneration Frequency
The “Days To Regen” display will now be flashing. This setting is used to initiate the
regeneration cycle after a preset number of days have passed.

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Parts Breakdown
Parts
Breakdown

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Drawing
No.
Part No. Description Quantity
1 V3175TC-01 Front Cover Assembly 1
2 V3107-01 Drive Motor 1
3 V3106-01 Drive Bracket and Spring Clip 1
4 V3818TC Circuit Board 4 Digit 1
5 V3110 Drive Reducing Gear 3
6 V3109 Drive Gear Cover 1
Not Shown V3186 Transformer 110VAC-12VAC 1
Parts Breakdown
Front Cover and Drive Assembly