Pentair Pool Products Acu-Tol AT8 Operating instructions

Installation and
Operation Guide
For Software Version AT-8-1.6
AT8™
Pool and Spa Controller
800-831-7133
www.pentaircommercial.com
www.pentairpool.com

32009 AT8M anual
TABLE OF CONTENTS
ChApTEr 1 INFOrMATION.............................................................4
1.1 SAFETY PRECAUTIONS................................................................................................4
1.2 WARRANTY ....................................................................................................................4
1.3 AT-8 OVERVIEW.............................................................................................................5
1.4 IMPORTANCE OF WATER MAINTENANCE ..................................................................5
ChApTEr 2 AT-8 SpECIFICATIONS................................................6
ChApTEr 3 INSTALLATION ............................................................7
3.1 INSTALLATION PREPARATION .....................................................................................7
3.2 INSTALLATION SUMMARY ............................................................................................7
3.3 FLOW CELL INSTALLATION ..........................................................................................8
3.4 AT-8 INSTALLATION ..................................................................................................... 11
3.5 ELECTRICAL WIRING CONNECTIONS.......................................................................12
ChApTEr 4 SENSOrS...................................................................18
4.1 PH AND ORP SENSORS..............................................................................................18
4.2 TEMPERATURE SENSOR............................................................................................19
4.3 FLOW SENSORS..........................................................................................................19
4.4 SENSOR CARE.............................................................................................................19
ChApTEr 5 OpErATION ANd prOgrAMMINg.........................20
5.1 READING SCREEN ......................................................................................................20
5.2 AT-8 SET UP..................................................................................................................23
5.3 PH PROGRAMMING.....................................................................................................26
5.4 ORP PROGRAMMING..................................................................................................30
5.5 TEMPERATURE PROGRAMMING...............................................................................34
5.6 DATA SUBMENU...........................................................................................................37
ChApTEr 6 MAINTENANCE............................................................... 39
ChApTEr 7 TrOuBLEShOOTINg.....................................40
ChApTEr 8 MENu TrEES..................................................41

2009 AT8 Manual 4
WARRANTY
Pentair Acu-Trol warrants the AT-8 to be free from defects in manufacturing and workmanship
for a period of one (1) YEAR from the date of manufacture for the electronic module.
AllcommercialpH andORPsensorshavea warrantyoftwo (2)years. Flowcells haveawarranty
of one (1) year. Other equipment is covered by manufacturer’s own warranty. During the warranty
period, any defective parts will be repaired or replaced when necessary by Acu-Trol.
This warranty does not cover: (a) the buyers’labor or any servicing fees related to replacement
of the Product; (b) damage resulting from the use of this Product in other than its normal manner; (c)
damage from misuse, accident or neglect; (d) damage from improper testing, operation, or installa-
tion; (e) not operating the Product on a dedicated (separate) circuit or under conditions other than
those recommended or at voltages or amperages other than the voltage or amperage indicated on
the Product; and (f) acts of Mother Nature (i.e. lightning, electrical storms, oods, etc.). In addition,
attempting to service or modify the Product will render this Warranty Void. Defective parts should be
returned immediately to the local PentairAcu-Trol dealer, any parts returned to the factory require a
return of material authorization form to subsequently generate an RMA Number (Returned Materi-
als Authorization). An Acu-Trol technician will analyze the returned part and determine the cause of
failure and process accordingly.
WARRANTY CARD MUST BE COMPLETED AND
RETURNED FOR WARRANTY TO BE VALID.

52009 AT8M anual
PLEASE READ THIS USER MANUAL completely before installing or operating the equipment.
The AT-8 is a Class 1 product for protection against electric shock and a Type 1 product with regards to disconnection
of the control circuits.
Be sure to observe the following safety precautions:
• Do not permit anyone untrained or under the age of 18 to use this product.
• Unit must be properly connected to earth ground.
• Never apply power when front panel is not secured in the closed position.
• Never service unit with power applied, always turn OFF main circuit breaker to unit and
all equipment when servicing.
• Touching the controller’s internal parts could result in injury and or damage to the controller.
In case of a malfunction, only a qualied technician should repair the controller.
• Risk of Electric Shock. Connect only to a grounding type receptacle protected by a
ground-fault circuit interrupter (GFCI).
• Do not bury cord. Route cord to eliminate abuse from heater exhaust, lawn mowers,
hedge trimmers, and other equipment.
• Be careful not to damage any of the insulation on wires or the power cord. Should the cord
be damaged, return it to your dealer for a replacement. Continued use could result in re
or electric shock.
• To reduce the risk of electric shock, do not use an extension cord to connect unit to
electric supply; provide a properly located GFCI.
• Never remove or install any cables between the circuit cards when power is applied,
damage to the components may occur.
CHAPTER 1
INFORMATION
1.1 SAFETY PRECAUTIONS
WARNING:
CHEMICAL BURN HAZARD - If possible, make sure pumps are OFF before drilling into
pipes. Securely fasten all electrical, water and chemical lines. Locate chemical feed pumps and
chemical storage tanks in a safe and secure area.
SAVE THIS INSTRUCTION GUIDE!
!

2009 AT8 Manual 6
1.3 AT-8 OVERVIEW
Acu-Trol, the technological leader in swimming pool automation, congratulates you on your
selection of the AT-8 swimming pool controller. The AT-8 will maintain the pH and sanitizer levels,and monitor and
report temperature levels.
The AT-8 features:
• Easy Read Display: The AT-8 uses an easy to read LCD display screen.
• Data Recording: TheAT-8 has the ability to record data from all sensors and to store a
selected amount of that data.
• Easy Programming: TheAT-8 uses a simple and intuitive programming method.
• Selectable Voltage: The AT-8 can be congured to use either 110 VAC or 220 VAC.
This allows the controller to be plugged in to an existing outlet, or wired directly in to the
electrical system.
1.4 IMPORTANCE OF WATER MAINTENANCE
A chemical controller is designed to maintain specic levels of sanitizing and balancing chemicals. Sanitizing chemi-
cals help to control the growth of bacteria and other organisms in the water of a pool or spa. Balancing chemicals
keeps a pool or spa at a certain pH level, preventing the water from becoming acidic, and corroding the pool and its
equipment, or becoming basic, and causing buildup on the equipment.
Water maintenance is an important part of operating a pool and or spa. Pool operators should be trained in water
maintenance by an authority recommended by their local health department. Water maintenance requirements are
generally determined by the county or state and can vary widely. However, most requirements fall within the following
range recommended by the National Swimming Pool Foundation:
• Filtration – Minimum turnover rate of six hours for a pool and 30 minutes for a spa.
• Water Balance – pH 7.2 – 7.6, alkalinity 80-120 PPM.
• Oxidation Reduction Potential (ORP) – A reading of 650 mV - 750 mV.
• Total Dissolved Solids – Should not exceed 2000 PPM. (excluding salt pools)
This information is meant to provide pool operators with a basic idea of the range of water maintenance requirements,
and the importance of water maintenance. To ensure that your facility is in compliance with all local regulations please
check with your local health department.

72009 AT8M anual
ChApTEr 2
AT-8 SpECIFICATION
Inputs: pH TEMPERATURE (10K probe)
ORP FLOW (switch only)
Display Range: pH 0.1 – 9.9 +/- 0.1
ORP 450 – 999mV +/- 2
TEMP 15 – 150 +/- 1
FLOW ON / OFF
Calibration Range: pH +/- 0.9
ORP +/- 125
TEMP +/- 50
Output Relays: pH 110/220 VAC 6A
ORP 110/220 VAC 6A, DRY, 24VAC 0.5A
Power Input: 120 VAC, 10A, 50/60 Hz
Control: ORP/pH Feed Auto/Proportional/Manual
pH Selection Acid/Base
pH Delay For suction side sanitizer feeders
Expansion Up to 8 bodies of water
Data Log 2048 lines of data at timed intervals
Safety: Feed Safety Prevents overfeed
Alarms High/Low
Password 6 digit password
ORP Lockout If pH greater than
No Flow Lockout No feed with loss of  ow

2009 AT8 Manual 8
3.1 Installation Preparation
3.2 Installation Summary
Receipt Inspection: Upon receiving the controller from shipping, check the carton carefully. Report any damaged
items directly to the shipping company. Examine the shipping list and verify that all items are present. Please contact
your local Acu-Trol dealer if any items are missing or have been damaged. Use care when unpacking equipment to avoid
damage or loss of small parts.
The following steps are required to completely install an AT-8:
1. Identify new and existing equipment to be connected.
2. Decide if the sensors will be in-line, in a separate by-pass line, or if the AK1200 ow cell will be used.
Caution: If the AK1200 is used, the input water maximum pressure is 25 PSI.
3. Determine the supply voltage, 110 VAC or 220 VAC, and set the supply
voltage switch as necessary.
4. Determine if the control to the equipment uses the same voltage as the supply
voltage. All controlled equipment must be compatible.
5. Determine the water-tap points for the ow cell bypass inlet and outlet.
6. Mount the AT-8 away from direct sunlight and on a at vertical surface.
7. Connect the supply voltage with main breaker off
(Must be a separate dedicated circuit GFCI).
8. If using an AK1200 ow cell install the bypass now.
9. Connect the sensors.
10. Test the plumbing for leaks.
11. Turn on/plug in the AT-8 for the rst time.
12. Test the equipment, using the AT-8 manual relay mode.
13. Calibrate the probes, then recalibrate as the probes acclimate to the system.
Acclimation can take as little as two hours or as long as 24 hours.
14. Program the AT-8.
15. Call or visit the controller over the next few days to insure the system is balanced and
in control. Fine-tune the setup if necessary.
CHAPTER 3
INSTALLATION

92009 AT8M anual
In order to install the AK1200 ow Cell, you will need
A Phillips screwdriver
A drill
A 1/4" drill bit
A 1/4" NPT tap
A small at head screwdriver
A 1/2" poly tubing
Remove ow cell from shipping carton and make sure all parts are included with AK1200 ow cell.
• 1 – AK1200 Lid • 1 – AK1200 Jar with O-Ring
• 1 – Flow switch magnet • 3 - ¼” Valves.
• 1 -Sample barb tting • 4 - ¼” NPT by ½” ex ttings.
• 1 - Filter assembly with O-Ring • 2 - ¼” plugs.
• 1 - Flow switch with O-Ring, 2’ • 1 - ¼” Close Nipple
and 10’ wire lengths available. • 1 - Teon Tape
• 2 - Mounting screws • 1 – Pressure gauge*
Note that ½” exible tubing is not included and is supplied by the installer or may be ordered from Acu-Trol.
* Use of Pressure Gauge is Optional
WARNING: DO NOT OVER TIGHTEN FITTINGS ON FLOW CELL TOPAS
THIS MAY BREAK OR CRACK FLOW CELL TOP.
1. Wrap all four ex ttings with Teon tape. Install two ex ttings into two ball valves.
2. Wrap barb tting with Teon tape. Install barb into remaining ball valve.
3. Wrap both ends of the close-nipple with Teon tape. Install into the lter assembly using
(either end OK). Hand-tighten only.
4. Install one ball valve into the lter.
5. Install the lter and remaining ball valves as shown in the gure.
6. Verify that the ow switch magnet is in the ow cell tube with the large, or hat end pointing
down.
NOTE: Wrap ttings only twice around with Teon tape.
3.3.2 Flow Cell Assembly
3.3 AK1200 Flow Cell Installation
3.3.1 Tools & Supplies Needed
• Mount the ow cell in an area away from direct sunlight.
• Mount the ow cell away from electrical panels.
• Mount the ow cell within 6ft of intended mounting place of the AT-8
• Mounting surface must be at and level.
3.3.3 Selecting the Flow Cell Mounting Location

2009 AT8 Manual 10
Select a suitable location for the ow cell meeting the following recommendations:
• The sensors should be away from direct sunlight, as this may affect the readings.
• The location should be where some water spillage will not damage anything.
Preferably below the level of the controller.
• Securely mount the bracket to wall using the two supplied screws.
3.3.4 Mounting the Flow Cell
Make sure pumps are OFF before drilling into pipes. Never turn chemical feed pumps ON when both ow cell
valves are closed. If injecting more than one chemical into the AK1200 make sure they will not be on at the same
time.
• It is essential that the supply line be at a higher pressure than the discharge line so the water will ow
through the cell at a steady rate in the right direction. Installing a ball valve in the main circulation line
may be required if the pressure is too low.
• Inlet should be installed after lter and before heater.
• Exit should be installed after heater and as far away from any equipment as possible.
• Drill and tap at above locations with 7/32” drill and 1/4” NPT tap. Choose a location on a tting
where the pipe enters so you are drilling through both the pipe and tting to get maximum depth
of thread.
• Install ¼” NPT by ½” ex ttings then route inlet and exit lines.
3.3.5 Plumbing the Flow Cell

11 2009 AT8M anual
• Keep pH and ORP sensors wet at all times, install the sensors into the ow cell. Hand-tighten only and
save caps for future use, ll ow cell with water. The sensors have O-Rings and don’t require Teon tape.
• Route a 10K temperature sensor wires into the controller through the strain relief and connect to the con-
troller. One wire (either one) to connector TB5 T- and the other wire to TB5 T+.
3.3.6 Sensor Installation
WArNINg
Securely fasten all electrical, water, and chemical lines.
Locate chemical feed pumps and chemical storage tanks in a safe and secure area.
WArNINg
Do not overtighten tting on ow cell top.
WArNINg
Inject chemicals only on the outlet side of the AK1200 ow cell.
WArNINg
Avoid installing the outlet before the main pump as a vacuum may damabe chemical sensors.
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Maximum operating pressure is 25lbs. Extreme pressure vairances may affect sensor readings.
WArNINg
Check lter daily for debris buildup and clean as needed.
To clean lter, turn the ow cell inlet and exit valves OFF, remove lter cover and lter, being careful
not to loose seal. Clean stainless steel lter and return to housing being careful to seat it properly.
The lter screen can be easily damaged if seated improperly when the cap is installed.
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TB5 - TB5 + TB6 - TB6 +
• Route the ow switch wires into the controller
through the strain relief and connect to the
controller. One wire (either one) to connector
TB6 ground and one wire to TB6 F+.
• Connect the chemical sensors to the controller
BNC connectors found on the right side
of the enclosure. The sensor wires and BNC
connections are labeled and color coded
for easy installation.
• Turn the main pump on and open the valves to
test for leaks and the free movement of
magnet. Magnet must be all the way up in order to
close the ow switch. 1/4 GPM will push the magnet
all the way up.
CAuTION
The Flow Switch is a dry contact only. (No current)
Use with any other brand ow switch
VOIDS WARRANTY.

2009 AT8 Manual 12
1. Install the 4 mounting feet as desired to the AT-8 back.
2. Hold the controller against the mounting surface with the lid closed and mark the location of the mounting
bracket located on the top of the controller next to the wall. Prepare holes as necessary and secure controller
using hardware provided.
3. Make sure the controller box is not distorted by an uneven mounting surface.
4. Drill the four holes and insert the four mounting anchors.
5. Secure the AT-8 to the mounting surface with the four screws.
3.4.2 Mounting the AT-8
CAuTION
Do not over tighten the four mounting screws. Damage to the enclosure will occur.
Select a location for mounting the AT-8, meeting the following conditions
1. At least ten (10) feet from open water.
2. Close enough for the supplied power cord to reach the supply voltage.
The controller will not operate properly without a solid earth ground connection.
3. Supply power must be routed to the AT-8 in accordance to applicable codes in the area;
the supplied power cord is not code in some areas.
4. The installation surface must be solid and vertical. Do not mount the controller in a
horizontal position.
5. Maintain adequate clearance for opening the enclosure.
6. The environment should be free of chemical fumes and excessive heat.
The maximum room temperature is 110 ºF.
3.4 AT-8 Installation
3.4.1 Mounting Location
WArNINg
Keep the AT-8 out of direct sunlight and inside a room if possible. Ashade screen should be used for outdoor
installations.
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Proper and safe operation requires an earth ground connection.
3.5 Electrical Wiring Connections
Always follow local electrical codes and if you are not sure, have a licensed electrician install all electrical wiring.
WArNINg
DO NOT OPENAT-8 COVER WHEN POWER IS APPLIED.

13 2009 AT8M anual
The AT-8 comes from the factory set for 110 VAC. Before applying power to unit make sure unit is still set for 110vac.
Inspect JP2 (located between fuses and transformer) and ensure the two black jumpers are connected between 1-2
and 3-4.
3.5.1 Internal Wiring Connections
3.5.1.2 Hardwiring the Chemical Feed System
3.5.1.1 110 VAC Feed System Set Up
The AT-8 is available with color coded pigtails for use with 110VAC feed
systems for an additional charge.
RED = Sanitizer, ORP, Chlorine
BLUE = Ph, Acid or Base
For 110VAC chemical feed systems simply plug your feed system into
the color-coded pigtail.
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To wire a feeder directly to the AT-8 cut and strip the wires 1/4” back and either tin the ends or attach a crimp on termi-
nal.
The connections to the terminal block are designated on the circuit board above and below the terminal block.
WArNINg
The connectors inside the AT-8 are close together. Failure to properly terminate wires could lead to shorts
between wires and is not covered by warranty.
• BELOW Terminal Block
o AC IN = plug or power to AT-8
o ORP NO = Sanitizer relay output with normally open relay
o ORP NC = sanitizer relay output with normally closed relay
o pH = Acid or Base relay output with normally open relay
• ABOVE Terminal Block
o L = line voltage, Black Wire
o N = line neutral, White Wire
o ↓ = line ground, Green Wire
The AT-8 comes from the factory set for 110 VAC. Before applying power to unit make sure unit is set for 220vac.
Inspect JP2 (located between fuses and transformer) and remove the two black jumpers. Reinsert one of the black
jumpers between pins 2 and 3.
3.5.1.3 220 VAC Feed System Set Up
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The AT-8 is now congured to run on 220vac and will output 220vac to
your chemical feed system.
WArNINg
Power should be off to the AT-8 before moving JP2 jumpers.

2009 AT8 Manual 14
Changing the sanitizer output voltage from the input voltage to 24vac is as follows:
• Remove the jumpers from JP1.
• Set one of the jumpers on JP1 between 3-5,
• Set the other jumper on JP1 between 4-6.
Note: The pH relay output voltage is always the input voltage.
3.5.1.5 24 VAC Sanitizer Set Up
To wire your 220vac feeder directly to the AT-8 cut and strip the wires 1/4” back and either tin the ends or attach a wire
ferrule.
• BELOW Terminal Block
o AC IN = plug or power to AT-8
o ORP NO = Sanitizer relay output with normally open relay
(no power until relay turned on)
o ORP NC = sanitizer relay output with normally closed relay
(power is on until relay turned on)- commonly used for Salt Chlorine Generators.
o pH = Acid or Base relay output with normally open relay
(no power until relay turned on)
• ABOVE terminal Block
o L = line voltage, one leg of 220vac
o N = line neutral, one leg of 220vac
o ↓ = line ground, Green Wire
3.5.1.4 Installing 220 VAC Feeders
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WArNINg
The connectors inside the AT-8 are close together. Failure
to properly terminate wires could lead to shorts between
wires and is not covered by warranty.
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Changing the sanitizer output voltage from the input voltage to a dry contact is as follows:
• Remove the jumpers from JP1.
• Replace one of the jumpers on JP1 between 3-4
• The AT-8 will now have a dry contact sanitizer output voltage.
3.5.1.6 Dry Contact (No Voltage) Sanitizer Output Voltage
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
WArNINg
Power should be off to theAT-8 before
moving JP1 jumpers.

15 2009 AT8M anual
• Remove all jumpers on JP1.
• Place a jumper between pins 1 and 3.
• Place a second jumper between pins 2 and 4.
• JP1 is now congured for line voltage.
3.5.1.7 Line Voltage (Input Voltage) Sanitizer Output Voltage
• Insert the ow switch though the small strain relief in the bottom of the AT-8.
• Connect the ow switch wires into TB6 located on the circuit board.
• Place one wire in to the F+ slot, and one wire in to the slot.
• Polarity does not matter on these connections.
3.5.1.8 Flow Switch
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4"4"
44&
WArNINg
Power should be off to the AT-8 beforemoving JP1 jumpers.
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• Run the temperature sensor through the small strain relief on the bottom of the controller.
• Connect the temperature wires to TB5 located on the circuit board.
• Place one wire in the T+ slot and one wire in the T- slot.
• Polarity does not matter on these connections.
3.5.1.9 Temperature Sensor
4"4"
44&

2009 AT8 Manual 16
• Run the Ethernet wire through the large strain reliefs on the bottom of the AT-8.
• The strain relief must be unassembled before inserting the bus wire
• Connect the Ethernet wire to either of the connectors.
3.5.1.10 Bus Connection
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To set up multiple AT-8’s each unit must have a different address. This is accomplished by the white rotary switch on
the bottom of the circuit board. Use a small at head screw driver and the table below to assign addresses. Addresses
must be assigned in numerical order or the system will not function properly.
• Position 0 = Master Unit 1(use this setting for single system applications)
• Position 1 = Unit 2
• Position 2 = Unit 3
• Position 3 = Unit 4
• Position 4 = Unit 5
• Position 5 = Unit 6
• Position 6 = Unit 7
• Position 7 = Unit 8
3.6 Multiple AT-8 Setup
• Mount and hookup all electrical connections as stated above.
• The AT-8’s will be daisy chained together using the Ethernet wires.
• Run another Ethernet wire through the large strain relief on the bottom of the controller.
• Connect to the remaining Ethernet connector.
• AT-8 must either be the rst or last unit in the bus.
3.6.1 Address Setup
The AT-8 enclosure can now be closed and the lid screws tightened.
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17 2009 AT8M anual
WArNINg
Sensors are shipped with a protective cap covering the electrode tip to protect the sensing element. Sen-
sors should be kept in the protective cap until ready for installation, if the sponge in the boot becomes dry,
wet it with tap water. During shipment, air bubbles may have entered the electrode, carefully shake the
electrode downward (like a thermometer) to dispel the air from the sensing elements inside the
electrode. Before using the sensor, remove the cap.
CHAPTER 4 SENSORS
The AT-8 can accept readings from a wide variety of sensors. Each sensor has its own unique circuitry that is con-
nected directly to the micro-controller for measurement. Isolation of each sensor ensures more accurate measure-
ments.
The AT-8 measures the following sensor measurements with the listed characteristics:
pH
Range: 4.22 to 9.78, ±0.02.
This measurement is temperature compensated.
WARNING: Sensors are shipped with a plastic case covering the electrode tip.
Sensors should be kept in the protective cap until time of installation. If the
sponge in the cover becomes dry, wet it with tap water.
ORP
Range: 0 to 999 mV, ±1mV.
WARNING: Sensors are shipped with a plastic case covering the electrode tip.
Sensors should be kept in the protective cap until time of installation. If the
sponge in the cover becomes dry, wet it with tap water.
Flow Switch
This input measures if a switch is open or closed.
pH electrodes sense the acidity of the water and work with any acid or base. The blue bands on the cables identify
the pH sensors. Each sensor is also identied on the sensor body. ORP electrodes are used to monitor the Oxidation-
Reduction Potential (sanitization quality of the water) of a given solution. The sensing element of the ORP electrode
is made of a precious metal such as platinum or gold. The red bands on the cables identify ORP sensors.
4.1 pH and ORP Sensors
The AK10K sensor can be installed to measure/display temperature. The sensor should be installed as close as
possible to where the water comes from the pool. If temperature probe is installed in the AK1200 ow cell there will be a
temperature variation due to the long tubes and the temperature in the pump room. A common place to install it is in the
small plugged hole in the bottom of the main pump strainer basket.
The sensor uses a special ¼” NPT tting to hold the stainless steel sensor. A hole should be drilled (7/32”) and
tapped (1/4”) where the water enters the pump room through a tting to get double the depth to hold the sensor. If in-
stalled outdoors make sure to keep it out of direct sunlight. Route the wires into the controller through a strain relief and
connect to the temperature input. The red wire goes to T and the black wire to GND.
4.2 Temperture Sensor

2009 AT8 Manual 18
The AT-8 is able to recieve information from one ow switch, provided with the Ak1200 ow cell This ow switch
is used to indicate ow through the ow cell and determines when it is OK to feed chemicals in to the system. The
AT-8 will not allow chemicals to feed if there is no ow in the system.
4.3 Flow Sensors
WArNINg
Do not rub hard on the glass element in the sensor or use sand paper or other polishing material to clean.
Handle electrode carefully. Sensors contain external and internal glass elements. Do not drop or otherwise
subject the sensor to vibration, physical impact, or freezing conditions. Any type of breakage is not covered
under warranty.
Contamination of the sensing elements often results in slow response and inaccurate readings. Clean the elements
by the following procedures:
pH and ORP sensors
• Wash electrode tip in a liquid detergent and water. Carefully use a soft bristled toothbrush to
wash the electrode tip and white sensing ring.
• Rinse after cleaning. To install, place in ow cell according to the diagram and hand tighten.
• Make sure the O-ring is installed on sensor.
• If the cable is longer than needed, it should be coiled neatly and attached under the cabinet.
pH Sensors Only
• Attempt to clean the sensor with liquid detergent rst.
• If this is not successful, swirl the tip of the sensor in a 5 parts water 1 part muriatic acid solution for
10 - 20 seconds.
• Rinse again and reinstall.
4.4 Sensor Care

19 2009 AT8M anual
CHAPTER 5 OPERATION AND PROGRAMMING
Overview: TheAT-8 system controller is designed to accommodate any size water system. Once
the controller is installed it is ready to be programmed. The system comes from the factory with
default programming and should only require a small amount of adjustments to work with the size
of body of water and chemical feeder of your system.
5.1 Reading Screen
The reading screen is the normally visible or default screen. From this screen you can see the
system number, sensor readings, alarms, indication of feed, indication of ow and allow manual
1 pH ORP TMP F
A 7.0 750 78 X

2009 AT8 Manual 20
• pH reading ashes if reading is outside of pH alarm set points.
• ORP reading ashes if reading is outside of ORP alarm set points.
• TEMPURATURE reading ashes if reading is outside of TEMP alarm
5.1.3 Alarms
5.1.2 Sensor Readings
• pH is displayed from 0.1 to 9.9.
• ORP is displayed from 450 to 999mV.
• Temperature is displayed for 15 to 150 and can have units of Celsius or Fahrenheit.
5.1.4 Indication of Feed
• “pH” ashes during feed of pH.
• “ORP” ashes during feed of sanitizer
• If you have multiple bodies of water being monitored each unit will have it’s information
displayed for 5 seconds. If you have 4 bodies of water then every 20seconds all bodies of
water will have been viewed once.
• The number of the currently displayed unit is in the upper left corner.
.
5.1.1 System Number
1pH ORP TMP F
A 7.0 750 78 X
• Pressing the SELECT button will lock onto the currently displayed system for 1 minute.
Pressing SELECT again will select the next system for viewing. After 1 minute has elapsed with no
presses on the SELECT key the 5 second rotation will resume
1 pH ORP TMP F
A 7.0 750 78 X
1 pH ORP TMP F
A 7.0 750 78 X
1 pH ORP TMP F
A 7.0 750 78 X