RODI systems AquaLynx 250 RO-AC-ENC-V2 User manual

AquaLynx®
Model 250 RO-AC-ENC-V2
RO Controller
Installation and
Operating Manual
505-334-5865 ph 505-334-5867 fax
www.rodisystems.com
email: [e-mail]
936 Highway 516 Aztec, NM 87410

Manual Revisions i
AquaLynx®Model 250 RO-AC-ENC-V2 Monitoring
and Control System
Installation and Operating Manual
Copyright 2018 RODI Systems Corp.
NOTICE
This manual is protected by federal copyright laws. It should not be copied in any way, shape, or fashion
without the written permission from RODI Systems Corp.
Version 1.20
For product and service information:
RODI Systems Corp.
936 Hwy 516
Aztec, NM 87410
Telephone: [phone]
Fax: [phone]
Email: [email protected]

Version History
Version
Date
Effective Pages
Description of Changes
1.00
02/12/18
-
Preliminary Issue
1.10
04/27/18
-
Initial Release
1.20
12/04/18
4-1
Removed Reference to
Zero Temp Calibration

Conventions and Symbols ii
Special characters, listed and described below, are used in this documentation to emphasize certain
information.
Note: Emphasizes additional information pertinent to the subject matter.
Warning: Emphasizes information about actions which may result in personal injury.
Caution: Emphasizes information about actions which may result in equipment
damage.
The following electrical symbols may be used in this documentation.
Symbol Meaning
Direct current.
Alternating current.
Both direct and alternating current.
Earth (ground) terminal.
Frame or chassis terminal.
!

General Limited Warranty iii
1. In no event will RODI Systems Corp., or any of its representatives, be responsible or
liable for indirect or consequential damages resulting from the use or application of any
product. The user and those responsible for applying the product must satisfy
themselves with the acceptability of the application.
2. RODI Systems Corp. extends a one (1) year warranty covering parts and labor on
any factory manufactured product. Any product, which is found to have a defect in
workmanship or components, shall be replaced or repaired at the option of RODI
Systems Corp.
3. A prepaid minimum inspection fee is required for the repair of products not
covered by the warranty period. Contact RODI Systems Corp. for repair information
and repair rates.
4. RODI Systems Corp. will not be responsible for replacement or repair of any
product that was damaged by improper installation, mishandling, or user
modifications.
5. All units returned for repair must have a RA (return authorization) number
obtained from RODI Systems Corp. This RA number must be included with the
returned product and any correspondence regarding the returned product must
reference that number. Shipping on all returned products must be pre-paid and
insured. RODI Systems Corp. will not be responsible for any shipping damage
incurred. Repaired products will be shipped pre-paid and insured.
6. RODI Systems Corp. reserves the right to change any specification or feature of
any product at any time. This right also extends to repair fees or any warranty
conditions contained herein.
Control systems utilizing microprocessors and software should never be used in
applications where the failure of such a system could endanger human life or
cause injury. Emergency stops and other fail-safe controls should be hardwired
into the control system, not interfaced with microprocessor control systems. If
the equipment is not used in a manner as specified in this installation and
operating manual, the safety features designed into this product may be impaired.
IMPORTANT NOTE: The AL250-V2 is powered via a multi-tap transformer
which allows it to operate on the following primary voltages (acceptable
range):
115 VAC (108-130 VAC)
208 VAC (187-220 VAC)
230 VAC (216-254 VAC)
Voltages outside of these values will damage the AL250-V2 power circuitry.
Check primary line voltage before connecting power to the AL250-V2. Do not
alter factory wiring in the AL250-V2. In areas susceptible to electrical surges,
use an appropriate surge protector on the primary side of the transformer (See
Appendix B).
Warranty

Table of Contents iv
AL250-V2 Overview 1-1
Introduction 1-1
Features 1-1
Specifications 1-2
Outputs 1-2
Inputs 1-3
Mode 1-4
Controls 1-5
Expansion Port 1-5
Serial Port 1-5
Data Logging 1-6
Installation 2-1
Environmental 2-1
Mounting 2-1
Ground 2-2
Connections 2-2
Power 2-2
I/O 2-3
Outputs 2-3
Inputs 2-4
Conductivity 2-5
Modem 2-5
Operation 3-1
Controls 3-1
Keypad 3-1
LED Indicators 3-2
Sequence 3-3
Screens 3-3
Main Menu 3-3
Status Screen 3-3
Quality Screen 3-3
Alarm Log 3-3
Settings Screen 3-3
Settings Table 3-4
Sanitization Lock 3-7
Diagnostic Screens 3-7
Time Delays 3-8
Calibration 4-1
Introduction 4-1
Conductivity Calibration 4-1
Troubleshooting 4-2
Temperature Calibration 4-2
Troubleshooting 4-3
Troubleshooting 5-1
Appendix A- Menu Diagram
Appendix B - Technical Notes

AL250-V2 Overview 1
Introduction The AL250-V2 Reverse Osmosis Controller is designed to control and monitor the
operating parameters of a single pump reverse osmosis water purification system.
Information is displayed on a back-lit liquid crystal display, and on individual light-
emitting diodes (LED). Functions and controls are operated through switches on the
keypad.
Features The AL250-V2 incorporates the following features:
Temperature Compensated Conductivity Monitor with Percent Rejection and
Adjustable Alarm Setpoint
Water Temperature Monitor with Adjustable High Temperature Shutdown
Three Modes of Operation: Stand-by, Tank Feed, and Direct Feed
Pretreatment Interlock
High Tank Level Shutdown
Low Tank Level Restart
Inlet Valve Control
Chemical Feed Pump Control
Pump Control
Low Feed Pressure Switch Sensing with Automatic Reset
High Pressure Switch Sensing
Autoflush with Adjustable Flush Interval and Duration
Permeate Diversion Valve Output
Alarm Output
Optional Inputs for Analog Pressure Sensors
Option Inputs for Sinking Pulse Flow Sensors
Data Logging (Requires Optional AquaGraphTM Software and Serial Cable)
Ports for Expansion and Serial Communication
1 2 3
ENT
CLR
Main
Menu
5
6
4
7890
SYSTEM RUN
SYSTEM STANDBY
ALARM RESET
ALARM SILENCE
ALARM
PRESSURE
LEVEL
STANDBY
QUALITY
FLOW
PRETREATMENT
SYSTEM RUNNING

Specifications The AL250-V2 incorporates the following specifications:
Power Requirements: The controller can operate with following primary
voltages (acceptable range). Depending upon the voltage being used,
the power must be wired to the proper position on the power terminal
strip near the transformer.
115 VAC (108-130 VAC)
208 VAC (187-220 VAC)
230 VAC (216-254 VAC)
Environment: The controller can operate at a temperature from 0° to 55° C (32°
to 131° F). Relative humidity must not exceed 95 percent. Do not
mount controller in direct sunlight.
Conductivity Monitor: The conductivity monitor measures the feed and product
water quality and displays this information in uS/cm. The value is
temperature compensated to 25° C (77° F). The controller calculates
and displays the salt rejection of the system (as a percentage).
Outputs The AL250-V2 is equipped with the following outputs. The 24 VAC outputs are in the
form of solid state triac outputs.
Inlet Solenoid: A 24 VAC output is provided to power the inlet solenoid valve.
This output always energizes 15 seconds before the pump turns on,
and de-energizes 15 seconds after the pump turns off. All water
systems equipped with this controller are also equipped with a
compatible inlet solenoid valve. If the valve must be replaced it must
function on 24 VAC and have a current load less than one ampere.
AutoFlush Valve: A 24 VAC output is provided to power the reject (Autoflush)
solenoid valve. This output will energize during the flush cycle thus opening
the valve and allowing flow to bypass the reject control valve. If the valve
must be replaced it must function on 24 VAC and have a current load less
than one ampere.
Chemical Injection Pump: A 24 VAC output is provided to control a chemical
injection system. This output energizes before the main pump starts and de-
energizes before the main pump shuts down. This output is intended to
power a relay or some other low current device.
Motor Starter: A 24 VAC output is included to provide controlled pump
operation. This output powers the coil of the magnetic starter relay.
This output is energized depending on other operating parameters.
This output also has a maximum current rating of one ampere.
Permeate Diversion Valve: This is also a 24 VAC output. When the percent rejection
of the system is below the setpoint, this output will be energized. This output
is also energized during a flush. This output will power a relay, which will
control an electric actuator. The maximum current available is one ampere.
Alarm: This consists of a 12 VDC output powering 108 db alarm horn mounted inside
the AL250-V2 enclosure. A dry contact relay (2 amps resistive) is also
provided for signaling external devices. The horn and relay are energized
when the following conditions are present:
1-2
!
Voltages outside of these values will damage
the AL250-V2 power circuitry. Check primary
line voltage before connecting power to the
AL250-V2.
!

Low Supply Pressure Shutdown
High Membrane Feed Pressure Shutdown
High Feed Water Temperature Shutdown
Low Salt Rejection Shutdown
Output or Transformer Overload
High Differential Pressure Shutdown (when using analog sensors)
High Permeate Pressure Shutdown (when using analog sensors)
High and Low Flow Recovery Shutdown (when using flow sensors)
All 24 VAC outputs are protected by positive temperature coefficient resistors
(polyfuses). The polyfuses interrupt the current to the AL250-V2 outputs should an
overload condition occur on an output. The polyfuses will reset when power is turned
off to the AL250-V2 and the fuse is allowed to cool. This eliminates the need for
replaceable fuses and prevents damage caused by the incorrect fuse being installed.
The primary side of the transformer in the AL250-V2 is also protected by a polyfuse.
The AL250-V2 will indicate an overload condition for each output. It will also indicate
an overload condition if the power to the AL250-V2 is interrupted within five seconds
after any of the six outputs have been activated. In this way, the AL250-V2 can
detect an overload in the transformer.
Inputs The AL250-V2 is equipped with the following inputs:
Conductivity Sensors: There are five inputs for each conductivity sensor, two for the
temperature detector (RTD), two for the electrodes in the conductivity cell,
and one for the cable shield. Inputs are available for both the feed and
product sensors. Sensors with cell constants of 0.01, 0.1, 1.0, and 10.0 may
be used. These cell constants provide a detection range of 1 uS/cm to
100,000 uS/cm. Only sensors with a 1000 ohm RTD will work with this
controller.
Pressure Sensors: There are four 4-20 mA inputs for pressure sensors monitoring
feed pressure, interstage pressure, reject pressure, and permeate pressure.
Differential pressures are calculated from feed pressure less interstage
pressure and interstage pressure less reject pressure. If not used, these
pressure inputs may be disabled in the settings menu.
Flow Sensors: There are three inputs for sinking pulse flow sensors. One sensor is
configured for feed or permeate flow, one sensor is configured for recycle
flow, and one sensor may be configured for either reject or permeate flow.
Percent recovery is calculated from feed and permeate flow. If not used,
these flow inputs may be disabled in the settings menu.
Low Pressure Switch: This is a dry contact that signals the system to shut down if the
pump suction (supply) pressure falls below the desired value. This is a
normally closed contact (when system is shut down). When a circuit is not
complete between the two terminals, the system will operate. If contact is
made between the two terminals, the system will shut down. An LED will
indicate when the system is in a state of low pressure shut down. The
system will attempt to restart every thirty seconds. The system will make up
to five attempts at restarting. The system must be able to run continuously
for thirty seconds without sensing low pressure. If the controller still senses
low pressure after the fifth restart, it will lock out and the alarm reset button
must be pressed to resume operation.
1-3

High Pressure Switch: This is a dry contact that signals the system to shut down if
the pump discharge or membrane pressure exceeds the desired value. This
is a normally open contact. When an open circuit condition exists between
the two terminals, the system will operate. If contact is made between the
two terminals, the system will shut down. An LED will indicate when the
system is in a state of high pressure shut down. The alarm reset button must
be pressed to resume operation after a shutdown due to high pressure.
Tank Level: The controller has two inputs that accept the dry contacts for the high
level and low tank level switches. If the controller is in the “Tank Feed” mode
(see the “Settings menu” section of this manual for further discussion), these
switches read the water level in the RO product storage tank and turn the
pump ON or OFF depending on the level. Each switch should be installed in
the tank so that the contacts close when the water level falls below that
particular switch. When the tank is full, the RO pump is turned off and the
“Tank Full” LED is on continuously. As the tank is drawn down, the LED
blinks. The LED turns off when the RO pump restarts to fill the tank (2 level
switch operation).
The AL250-V2 may be configured to use only one tank level (high tank level)
switch. Again the system must be operated in the “Tank Feed” mode (see
the “Settings menu” section of this manual for further discussion). When this
configuration is being used; the “Tank Full” LED will indicate when the
system is in a state of high tank level (level switch open). The system starts
and stops based only upon high tank level and the “High Tank Startup Delay”
setpoint. When the level drops (the switch closes), the system will re-start
after the “High Tank Startup Delay” (see “Settings Menu” section of this
manual for further discussion). The “Tank Full” LED will blink while the “High
Tank Startup Delay” timer is timing.
Pretreatment Interlock: This is a dry contact that signals the system to shut
down when a pretreatment device is not functioning or regenerating.
This could be used on a water softener, multimedia filter, chemical feed
pump, pressure differential switch on prefilters, etc. This contact is
normally closed. When a circuit is complete between the two terminals
the system will operate. If contact is broken the system will shut down.
An LED will indicate when the system is shut down due to pretreatment
interlock. The system will restart itself when the contact is closed.
Chemical Pump Failure: This is a dry contact that signals the failure of the
chemical injection system. This input differs from the “Pretreatment
Interlock” in that it does not allow the system to restart. This contact is
normally open. When an open circuit condition exists between the two
terminals, the system will operate. If contact is made between the two
terminals, the system will shut down. An LED will indicate when the
system is shut down due to chemical pump failure.
All input connections on the AL250-V2 provide a supply voltage and are designed for
dry contacts. Do not apply voltage to the inputs as permanent damage may
result.
Mode The AL250-V2 is designed to operate in one of three modes. The mode of operation
is selected from the Settings menu.
The stand-by mode is intended to place the system in a temporary non-
operational mode. When the system is placed in this mode, it will
1-4
!

perform a flush as scheduled by the amount of time entered for “Flush
Interval” in the Settings data entry screen (See “Settings” section of this
manual). The Flush Interval is the number of minutes between flushes.
The Flush Duration is the total time in seconds that unit flushes. During
a flush, the inlet, autoflush, and diversion solenoid valves are open and
the high pressure RO pump and chemical pump (if applicable) are both
running. The % Salt Rejection alarm is not activated during a flush.
When the flush is complete, the pump will turn off and the inlet, flush,
and diversion valves will close. The system will repeat this cycle based
upon the time entered in the Flush Interval. (If the Flush Interval is set
for zero the system will only flush on start up.) When the system is
flushing, the amount of time remaining in the flush cycle will be
indicated on the third line of the display. When the system is idle, the
amount of time remaining until the next flush will be indicated.
The tank feed mode is intended to place the system in an operational mode
when feeding a storage tank. When in this mode the system will shut
down when the high tank level switch (not provided) has an open
contact. The system will restart when the low level switch closes or
after the High Tank Startup Delay interval if the system is not equipped
with a low level tank switch (See “Settings” section of this manual).
The flush cycle is also enabled in this mode. The controller will activate
a flush when the system starts and at intervals while the tank is full.
The Flush Interval and Duration are entered in the Settings menu (See
“Settings” section of this manual). If the Flush Interval is set for zero
the system will only flush on start up. When the system is autoflushing,
the amount of time remaining in the flush will be indicated on the third
line of the display.
The direct feed mode is intended to place the system in an operational mode
when the system is feeding a distribution loop or another piece of
equipment. In this mode the system will not flush and the tank level
switch(es) is/are disregarded. When the system is in this mode, the
total number of hours the system has been operated will be indicated
on the last line of the display.
NOTE: Standby mode is selected from the Operating Mode screen (selection
“1” from the Settings screen). Tank or Direct feed operation is selected from
first setting (Index 0) from the list of settings accessed by selecting “2” from the
Settings screen.
All three modes of operation are controlled by the System Start and System
Stop keys. For example, if the system is put in standby mode and the System
Start key is not pressed, the RO unit will not operate the flush cycles. This is
the same for tank feed and direct feed modes, if the System Start key is not
pressed, the RO unit will not operate. The system automatically stops the RO
unit whenever a change between tank feed/direct feed and standby modes is
made, requiring the operator to restart the RO unit. “SYSTEM STOP” key must
be pressed prior to changing between tank feed and direct feed operation.
Controls The AL250-V2 is equipped with the following controls and indicators.
4 x 20 LCD with LED Backlight
Eight LED Indicators for Alarms and Status
20 Tactile Keys for Control and Data Entry
1-5

Expansion Port The AL250-V2 is equipped with one RS-485 expansion port which allows it to be
networked into a larger water treatment monitoring system via Modbus RTU. The
RS-485 expansion port is the 6 pin, watertight connector located in the upper right
hand corner of the left hand side of the AL250-V2 enclosure.
Serial Port The AL250-V2 is equipped with one RS-232 serial port which allows it to be equipped
with an optional internal modem module for remote monitoring and downloading of
data (program updates, default set points, etc.). The RS-232 serial port is also
connected to the 5 pin, watertight connector located directly below the RS-485
expansion port on the left hand side of the AL250-V2 enclosure. Connecting to the
serial port on the side of the enclosure will automatically disconnect the internal
modem.
Data Logging The AL250-V2 is designed to log data from the RO system. This data may be
retrieved locally through the serial port connection or remotely if the AL250-V2 unit is
equipped with the optional modem. Retrieval of logged data requires the use of
AquaGraphTM PC software and serial cable.
1-6

Installation 2
Environmental The AL250-V2 is equipped with a NEMA 4X enclosure for use in industrial
environments subject to occasional exposure to water sprays and other wet
conditions. The AL250-V2 should not be used in explosive environments. General
environmental specifications are listed below. DO NOT mount controller in direct
sunlight.
Environmental Specifications
Specification
Rating
Storage Temperature
-20 to 70 Deg C
Ambient Operating Temperature
0 to 55 Deg C
Ambient Humidity
30% to 95 % Relative Humidity (Non-Condensing)
Mounting The AL250-V2 is designed to be mounted in a horizontal position on a flat surface by
means of four mounting holes. Opening the front cover of the enclosure allows
access to the mounting holes, access to the bottom holes requires temporary
removal of the hinge assemblies. When mounting the AL250-V2, sufficient room
should be allowed on the side and bottom of the device for access to the I/O and
serial port connections. Mounting dimensions are shown below.
7/8" Diameter Hole for
Conduit or Cord Grip
Overall Length 10.875"
Overall Height 7.313"
Overall Depth 5.250"
Mounting Hole Distance 10.000"
Mounting Hole Distance 6.469"
Cord Seals for
I/O Connections
Serial Port
Connector
Expansion Port
Connector
Alarm Beeper
1 2 3
ENT
CLR
Main
Menu
5
6
4
7890
SYSTEM RUN
SYSTEM STANDBY
ALARM RESET
ALARM SILENCE
ALARM
PRESSURE
LEVEL
STANDBY
QUALITY
FLOW
PRETREATMENT
SYSTEM RUNNING
These openings plugged at
factory and should remain
plugged in not used.

Ground A good common ground reference (earth ground) is essential for proper operation of
the AL250-V2. A good earth ground or power circuit ground should be connected to
the ground terminal block l on the enclosure backpanel.
Connections Screw terminals are provided for making connections for sensor inputs and power.
Sensor and I/O terminals are located on the inside of the door of the AL250-V2
enclosure. The terminals are numbered in ascending order from left to right. Power
terminals are on the backpanel of the enclosure. Power should always be
disconnected from the AL250-V2 before making or changing any connections on
these terminals.
Power The incoming power is connected on the terminal blocks just below the transformer
on the backpanel of the enclosure. The triple tap transformer will accept 115, 208, or
230 volts AC (50 or 60 Hz). Depending upon the voltage being used, the power is
connected to one of three terminals as illustrated.
If 460 VAC is the only power source available,
use a separate step-down transformer to lower
the voltage to 230 VAC.
The AL250-V2 transformer is equipped with an
internal thermal fuse on the primary winding to
prevent damage from overloads.
Always replace the terminal block cover after
making the power connection.
Verify line voltage and check primary wiring
(diagram at right) before applying power to
the AL250-V2. Primary voltages outside of
the ranges shown at right will result in
damage to the AL250-V2 circuitry.
In locations subject to transient power
surges, use a surge protector on the primary
connections to the transformer. See
Appendix B for more information on surge
protection.
2-2
343332313029
282726252423
2221201918171615
10090807060504030201 1413 1211 373635
Terminal Blocks for I/O
and Sensor Connections Terminal Blocks for
Power Connections
!
!
0 VAC 115 VAC 208 VAC 230 VAC
Connect AC Neutral Here
If 115 VAC, (108-130 VAC) Connect Here
If 208 VAC, (187-230 VAC) Connect Here
If 230 VAC (216-254 VAC), Connect Here
Connect Ground Here
0 115 208 230

I/O The connections for the inputs and outputs are shown below. Avoid using
excessively large wire (larger than 18 AWG) on the inputs and outputs since it may
prevent the enclosure door from closing properly. All wires from the inputs and
outputs must pass through the grommet in the cord seal. Any unused openings in
the grommet must be sealed with plugs to maintain the watertight characteristics of
the enclosure.
Outputs All outputs (with the exception of the external alarm) are 24 VAC, one amp maximum.
Any device connected to an output should be rated for less than one amp at 24 VAC.
An overload on any output will cause current to be interrupted to the output and an
alarm condition will occur. If the transformer supplying the controller becomes
overloaded, the controller will reboot. If the overload still exists after the controller
reboots, the controller will shut down the system and log an overload alarm.
The discrete outputs on the AL250-V2 are 24VAC only. The output loads (e.g.,
solenoid valves) cannot be bussed to the incoming power supply neutral (See
figure on page 2-4). Two wires for each output must be connected to the load
device from the AL250-V2.
Inlet Solenoid: A 24 VAC output is provided to power the inlet solenoid valve. The valve
must function on 24 VAC and have a current load less than one ampere or
otherwise be powered by an interposing relay.
AutoFlush Valve: A 24 VAC output is provided to power a reject (Autoflush) solenoid
valve. This output will energize during the flush cycle thus opening the valve
and allowing flow to bypass the reject control valve. The valve must function
on 24 VAC and have a current load less than one ampere or otherwise be
powered by an interposing relay.
Chemical Injection Pump: A 24 VAC output is provided to control a chemical
injection system. This output is intended to power an interposing relay or
some other low current device interfaced with the pump.
Motor Starter: A 24 VAC output is included to provide controlled pump operation. This
output powers the coil of the magnetic starter relay if rated at one ampere or
less. Other loads will require an interposing relay.
Permeate Diversion Valve: This is also a 24 VAC output. When the percent rejection
of the system is below the setpoint, this output will be energized. This output
is also energized during a flush. This output will power a relay, which will
control an electric actuator. The maximum current available is one ampere.
01 02 03 04 05 06
07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 29
30
31
32
35 36 37
Perm Cond (White) Perm Cond (Shield) Perm Cond (Black) Feed Cond (White) Feed Cond (Shield) Feed Cond (Black)
Feed Temp (Red) Feed Temp (Green)
Perm Temp (Red) Perm Temp (Green)
12 VDC (+)
Alarm Horn 12 VDC
Permeate Diversion Valve Motor Starter
Chem Pump
Auto Flush Valve
Inlet Valve
24 VAC 24 VAC 24 VAC 24 VAC 24 VAC Low Pressure Switch Input High Pressure Switch Input Mid Tank Level Switch Input High Tank Level Switch Input
Pretreatment Interlock Input
24 VAC Chem Pump Failure Input
Ground 24 VAC
24 VAC
23
24
25
26
27
28
P1 P2 P3 P4 P5 P6 P7 P8
Feed Pressure (+) Interstage Pressure (+) Reject Pressure (+) Permeate Pressure (+) Feed Pressure (-) Interstage Pressure (-) Reject Pressure (-) Permeate Pressure (-)
F1 F2 F3 F4 F5 F6 F7 F8 F9
Feed Flow (+) Feed Flow (-) Feed Flow Shield
Perm/Reject Flow (+) Perm/Reject (-) Perm/Reject Flow Shield Recycle Flow (+) Recycle Flow (-) Recycle Flow Shield
R1
R2
33
34
Alarm Relay
Alarm Relay
24 VAC Common
Auxiliary Output
A1
A2
NOTE: Terminal numbers are not in order intentionally. This allows terminal connections to match previous versions of the controller.
!
2-3
!

Alarm: This consists of a 108 db alarm horn mounted inside the AL250-V2
enclosure. A separate alarm output connection provides a dry relay contact
rated on 2 amps.
Ground 24 VAC
35 36 37
0
120
AC Power Supply
Ground 24 VAC
35 36 37
0
120
AC Power Supply
The solenoid coils are referenced to
high voltage power supply.
DO NOT BUSS TO THE
INCOMING POWER SUPPLY NEUTRAL.
The outputs are referenced to
24VAC after the 24 VAC transformer.
USE TWO CONNECTIONS FOR
EACH OUTPUT.
Incorrect Wiring Correct Wiring
24 VAC
24 VAC
29 3125 27 33
24 VAC Common
A1
30 3226 28 34A2
Permeate Diversion Valve Motor Starter
Chem Pump
Auto Flush Valve
Inlet Valve
Auxiliary Output
29 3125 27 33
24 VAC Common
A1
30 3226 28 34A2
Permeate Diversion Valve Motor Starter
Chem Pump
Auto Flush Valve
Inlet Valve
Auxiliary Output
2-4
29 3123 25 27
R1 33
24 VAC Common
A1
30 3224 26 28R2 34A2
12 VDC (+)Alarm Horn 12 VDC Permeate Diversion Valve Motor Starter
Chem Pump
Auto Flush Valve
Inlet Valve
Alarm Relay Alarm Relay
Auxiliary Output
AC or DC Power
2 Amps Max

Analog Pressure
Inputs All inputs are designed for 4-20 mA isolated sensors. Excitation voltage to the
sensors is supplied by the AL250-V2.
Feed Pressure Sensor: This sensor monitors the pressure of the water being
fed to the inlet of the pressure vessel array.
Interstage Pressure Sensor: This sensor monitors the pressure of the water
between the first and second stage arrays. First stage differential
pressure is calculated by the AL250-V2 as the feed pressure less the
interstage pressure.
Reject Pressure Sensor: This sensor monitors the pressure of the water exiting
the second stage array. Second stage differential pressure is
calculated by the AL250-V2 as the interstage pressure less the reject
pressure.
Permeate Pressure Sensor: This sensor monitors the pressure of the
permeate.
P1 P2 P3 P4 P5 P6 P7 P8
Feed Pressure (+) Interstage Pressure (+) Reject Pressure (+) Permeate Pressure (+) Feed Pressure (-) Interstage Pressure (-) Reject Pressure (-) Permeate Pressure (-)
+-+-+-+-
Flow Inputs All inputs are designed for sinking pulse isolated sensors. Excitation voltage to the
sensors is supplied by the AL250-V2.
Feed Flow Sensor: This sensor monitors the feed flow entering the RO system.
Permeate or Reject Flow Sensor: This sensor is configured in the settings menu to
monitor either permeate or reject flow. Flow recovery is calculated based on
feed flow and permeate flow.
Recycle Flow Sensor: This sensor monitors the flow of reject that is recycled back to
the feed of the system.
2-5

F1 F2 F3 F4 F5 F6 F7 F8 F9
Feed Flow (+) Feed Flow (-) Feed Flow Signal
Perm/Reject Flow (+) Perm/Reject (-) Perm/Reject Flow Signal Recycle Flow (+) Recycle Flow (-) Recycle Flow Signal
+-+-+-
Discrete Inputs All inputs should be dry contacts rated for 24 VAC. Do not apply voltage to the
inputs. Input voltage to the contacts is supplied by the AL250-V2.
Low Pressure Switch: This is a dry contact that signals the system to shut down
if the pump suction pressure falls below the desired value. This is a
normally closed contact (when the system is shut down). When a
circuit is not complete between the two terminals, the system will
operate. If contact is made between the two terminals, the system will
shut down.
High Pressure Switch: This is a dry contact that signals the system to shut
down if the pump discharge or membrane pressure exceeds the
desired value. This is a normally open contact. When an open circuit
condition exists between the two terminals, the system will operate. If
contact is made between the two terminals, the system will shut down.
Pretreatment Interlock: This input is designed to be normally closed. If a
pretreatment interlock input is not being connected, a wire jumper must
be installed between the two terminals at Input 5. Since the input is
normally closed, multiple devices may be wired to this input in series.
Chemical Pump Failure*: This is a dry contact that signals the failure of the
chemical injection system. This is a normally open contact. When an
open circuit condition exists between the two terminals, the system will
operate. If contact is made between the two terminals, the system will
shut down.
Tank Level Switches: The AL250-V2 is designed to be used with one or two
tank level switches. Switches should be wired in the normally closed
position (the switch contacts close when the water level drops below
the switch). When using two switches, a low-level tank switch starts
the system (in Tank Feed mode) and a high-level switch stops the
system. When using one switch, the switch connected must be a high-
2-6

level switch. The switch will stop the system at high level. When the
level drops (the switch closes), the system will re-start after the “High
Tank Startup Delay”, in minutes (See “Settings” section of this manual)
that has been configured into the Settings data entry screen. The
controller must be configured for one or two switch operation in the
Settings menu (See “Settings” section of this manual).
Conductivity The AL250-V2 is designed to monitor conductivity by means of a standard two
electrode conductivity cell. Sensors with cell constants of 0.01, 0.1, 1.0, and 10.0
may be used. These cell constants provide a detection range of 1 uS/cm to 100,000
uS/cm. Only sensors with a 1000 ohm RTD will work with this controller.
Permeate Conductivity Sensor
Feed Conductivity Sensor
White
Red
Shield
Green
Black
01 02 03 04 05 06
07 08 09 10
Perm Cond (White) Perm Cond (Shield) Perm Cond (Black) Feed Cond (White) Feed Cond (Shield) Feed Cond (Black)
Feed Temp (Red) Feed Temp (Green)
Perm Temp (Red) Perm Temp (Green)
White
Red
Shield
Green
Black
Conductivity cells should be connected by means of Belden cable no. 8724 or
equivalent. When routing the conductivity cables, stay clear of AC cables, motors, or
other sources of electrical interference. Never run sensor cables in the same conduit
with AC cables.
Modem* The optional modem for the AL250-V2 is housed inside the AL250-V2. The modem
is connected by plugging the ribbon cable connector onto the dual row connector
located on the I/O board under the I/O cover plate. The modem is equipped with a
standard RJ connector for connection to an analog phone line. Do not connect the
AL250-V2 modem to an intra-office digital phone line. Damage to the modem
can occur. Once connected to a modem, the AL250-V2 can be accessed by means
of Windows-based AquaGraphTM software for remote monitoring or data retrieval.
!
2-7
NOTE: Terminal numbers are not in
order intentionally. This allows
terminal connections to match
previous versions of the controller.

Operation 3
Controls The AL250-V2 is housed in a NEMA 4X enclosure with a membrane keypad.
Indicators include a 4 line x 20 character LCD with LED backlight and eight high
intensity LED indicators for alarm conditions. The control features of the AL250-V2
are illustrated below.
Keypad The membrane keypad contains 20 tactile keys which are used for a number of
control and data entry functions.
System Start: Pressing this key starts the system. If the Direct Feed mode has
been chosen, pressing the System Start key immediately initiates the
startup sequence. If the Tank Feed mode has been chosen, pressing
this key will not initiate the startup sequence unless the tank is below
high-level. Pressing this key in Stand-By mode will initiate the flush
sequence of flush cycles.
System Stop: Pressing this key stops the system and essentially turns all
functions off.
Alarm Reset: Pressing this key resets the system after an alarm shut down for
low pressure, high pressure, low quality, high temperature, overload, or
chemical injection failure (VANTAGE RO systems only).
LCD Display with Backlight LED Alarm and Status Indicators
Keys Used for System Control
Keys Used for Data Entry
and Configuration
1 2 3
ENT
CLR
Main
Menu
5
6
4
7890
SYSTEM RUN
SYSTEM STANDBY
ALARM RESET
ALARM SILENCE
ALARM
PRESSURE
LEVEL
STANDBY
QUALITY
FLOW
PRETREATMENT
SYSTEM RUNNING