Pentair Autotrol 255 Logix 740-760 User Manual (English)

Questions and Answers:

J
Joshua SanchezAug 17, 2025
What to do if my Pentair Water Filtration System brine tank overflows?
- J
  Jessica OwensAug 17, 2025
  If your brine tank overflows, it could be due to several reasons. An uncontrolled brine refill flow rate might be the issue, in which case you should remove the brine controller to clean the ball and seat. Another possible cause is an air leak in the brine line to the air check; inspect all connections in the brine line for leaks. Lastly, the drain control could be clogged with resin or other debris, so cleaning the drain control might solve the problem.
G
Gregory RobinsonAug 20, 2025
Why is my Pentair Water Filtration System leaking hard water after regeneration?
- B
  Bradley FordAug 20, 2025
  Hard water leakage after regeneration can occur due to several reasons. It could be caused by improper regeneration, so try controlling the brine dosage setting and repeating the regeneration. A leaking external bypass valve can also be the culprit, requiring replacement of the bypass valve. Another potential cause is a damaged O-ring around the riser pipe, which would need replacing. Lastly, an incorrect capacity setting could lead to this issue, so verify the appropriate brine amount and system capacity.
J
Joseph SmithAug 23, 2025
Why won't my Pentair Water Filtration System controller draw brine?
- J
  Jennifer HammondAug 23, 2025
  If your controller isn't drawing brine, consider the following potential causes: low water pressure, which requires adjusting the settings according to the instructions; a restricted drain line, which needs the restriction removed; a plugged injector, requiring cleaning of the injector and screen; a defective injector, which means you should replace the injector and cap; valve disc 2 and/or 3 not closed, so remove any foreign matter from the disc and check if the disc can close by pushing on the stem, replacing the disc if needed; or the air check valve prematurely closed, so put the controller momentarily into brine refill (C8 - cycle) and replace or repair the air check if needed.
C
Carrie HatfieldAug 26, 2025
Why is my Pentair Water Filtration System valve not drawing brine?
- R
  Randy HuynhAug 26, 2025
  If the valve isn't drawing brine, possible causes include low water pressure, so set the pump to maintain 1.4 bar at the softener. Another reason could be a restricted drain line, so change the drain to remove the restriction. Additionally, the injector might be plugged, necessitating cleaning of the injector and screen, or the injector could be defective, requiring replacement. Finally, the air check valve may be closing prematurely, so put the controller momentarily into brine cycle (C2) and replace or repair the air check if needed.
S
saraperkinsAug 28, 2025
What to do if Pentair Water Filtration System is dripping water after regeneration?
- R
  robertsdavidAug 29, 2025
  If you notice flowing or dripping water at the drain or brine line after regeneration, it might be due to a weak valve stem return spring, in which case you should replace the spring. Alternatively, the valve disc might not be closing properly due to debris, requiring you to remove the debris.
J
Jason GilbertAug 31, 2025
How to fix Pentair Water Filtration System regenerating at wrong time?
- M
  Mr. Marcus OconnorAug 31, 2025
  If your controller regenerates at the wrong time, it's likely that the controller is set incorrectly. Correct the time setting according to the instructions.
R
robertsontiffanySep 3, 2025
Why doesn't my Pentair Water Filtration System controller regenerate automatically?
- J
  Jesus DavisSep 3, 2025
  If your controller isn't regenerating automatically, make sure the AC transformer or motor are connected. If they are already connected, the motor might be defective, requiring replacement.
S
Sheila SuttonSep 5, 2025
Why is my Pentair Water Filtration System using incorrect salt amount?
- J
  Jennifer MurphySep 5, 2025
  If the system uses more or less salt than the brine setting, it may be due to foreign matter in the valve causing incorrect flow rates. Remove the brine controller and flush out any foreign matter. Then, advance the controller to the brine cycle (C2) to clean the valve; afterward, the controller goes to the "2nd fast rinse" cycle (C7) to remove any brine from the tank.
J
josephparksSep 8, 2025
What to do if Pentair Water Filtration System shows ERR3?
- G
  gonzalezstephenSep 8, 2025
  If your system displays 'ERR3', it indicates that the controller lost the position of the camshaft. First, wait for 2 minutes to allow the controller to return to the Home position. During this time, an hourglass icon will flash, indicating that the motor is running. If the camshaft doesn't rotate, check the motor connections, ensure the motor wire harness is connected to both the motor and the controller, verify the optical sensor connection and position, and confirm that the motor and camshaft gears are engaged. If the camshaft rotates for more than 5 minutes to find the Home position, check the optical sensor connection and position, the camshaft connection, and the cleanliness of the camshaft slots.

Pentair Autotrol 255 Logix 740-760 Specifications

General

Category	Water Filtration Systems
Type	Control Valve
Regeneration Type	Upflow or Downflow
Model	Autotrol 255 Logix 740/760
Pressure Range	20 - 125 psi (1.4 - 8.6 bar)
Timer Type	Electronic
Brine Line	3/8"

Summary

Generalities

Scope of the documentation

Defines the purpose and scope of the manual, including installation, operation, and maintenance procedures.

Release management

Tracks revisions and changes made to the document over time.

Manufacturer identifier, product

Provides manufacturer details and the specific product identifier.

Intended use

Specifies the intended applications and purpose of the device.

Abbreviations used

Lists and defines common abbreviations used throughout the manual.

Norms

Outlines applicable norms and standards the product complies with.

Applicable norms

Lists relevant European directives and technical standards.

Available certificates

Lists available product certifications.

Procedure for technical support

Details the steps for requesting technical assistance and support.

Copyright

States the copyright information for the manual.

Limitation of liability

Outlines Pentair's limitations of liability regarding product use and warranty.

Scan & Service application

Explains the use of the Scan & Service mobile application for maintenance.

Safety

Safety pictograms definition

Explains the meaning of safety pictograms used throughout the manual.

Serial and safety tags location

Shows the location of important identification and safety tags on the device.

Hazards

Details general hazards associated with the device and installation.

Personnel

Specifies requirements for authorized personnel performing work on the system.

Material

Lists safety precautions related to the device's materials and components.

Hygiene and sanitization

Covers hygiene measures and sanitization procedures for the system.

Sanitary issues

Discusses preliminary checks and storage for sanitary purposes.

Hygiene measures

Details specific hygiene measures, including disinfection recommendations.

Description

Technical specifications

Lists the technical data, ratings, and specifications of the valve.

Performance flow rate characteristics

Presents graphs showing flow rate vs. pressure drop for the valve.

Outline drawing

Shows dimensioned drawings of the valve's physical outline.

Description and components location

Illustrates the location of various components on the valve assembly.

System regeneration cycle (8-cycles operation)

Explains the different stages of the system's regeneration cycle.

System sizing

Recommendations

Provides recommendations for system sizing and component selection.

Injector/DLFC/Refill flow controler-Valve configuration

Details valve configurations based on vessel diameter and media volume.

Cycle time calculation

Explains that the controller automatically calculates cycle times.

Injector flow rates (tables)

Presents charts showing injector flow rates based on inlet pressure.

Salt amount definition

Defines the different salt settings and their corresponding brine usage.

Installation

Safety notices for installation

Highlights critical safety warnings to be observed during installation.

Installation environment

Describes suitable environments and conditions for installing the system.

General

Covers general guidelines for installing the system, including water and media handling.

Electrical

Details electrical connection requirements and safety precautions.

Mechanical

Provides mechanical installation guidelines, including lubricants and connections.

Outdoor Locations

Discusses considerations for installing the system outdoors, such as moisture, temperature, and wind.

Integration constraints

Lists requirements for integrating the system into existing plumbing and electrical setups.

Block diagram and configuration example

Shows a system block diagram and an example of a configuration.

Valve connection to piping

Explains how to connect the valve to the system's piping.

Top-mounted valve installation

Details specific instructions for installing a top-mounted valve, including flexible connections.

Connections (electrical)

Illustrates the location of various electrical connections on the controller.

Bypassing

Explains the function and installation of bypass valves for system isolation.

Drain line connection

Provides instructions for connecting the drain line, including elevation and air gap requirements.

Overflow line connection

Details how to connect the overflow line for the brine tank.

Brine line connection

Explains how to connect the brine line from the tank to the valve.

Programming

Display

Explains the symbols and indicators shown on the controller's display screen.

Commands

Describes the function of each button on the controller's interface.

Basic programming

Outlines the steps for basic programming of the controller.

Basic programming mode chart

Provides a table detailing parameters, ranges, defaults, and notes for basic programming.

Program system size

Guides on setting the system size and resin volume.

Time setting and winter time - summer time change

Explains how to set the current time and adjust for daylight saving.

Day of week

Details how to set the current day of the week.

Regeneration time

Explains how to set the desired time for regeneration.

Days to regenerate (740 time-clock controller only)

Describes setting the frequency of regeneration based on days.

Calendar override (760 on-demand controller only)

Explains setting a calendar override for regeneration.

Amount of brine used per regeneration

Details how to set the amount of brine used for regeneration.

Estimated capacity

Explains how to set and view the system's estimated capacity.

Hardness (760 on-demand controller only)

Guides on setting the inlet water hardness for the system.

Advanced programming

Introduces the advanced programming features for installers.

Master setting reference chart

Provides a comprehensive chart of advanced programming parameters.

Cycle time programming

Explains how to program the duration of each regeneration cycle.

Diagnostic

Details how to access diagnostic codes and their meanings.

Resetting the controller

Provides instructions for resetting the controller to its default state.

Commissioning

Water filling, draining and waterproofness inspection

Explains how to fill, drain, and check the system for leaks.

Activating the softener

Details the procedure for activating the softener after initial setup.

Additional tips

Offers extra tips and troubleshooting advice for commissioning.

Sanitization

Explains the importance and methods of sanitizing the water softener.

Disinfection of water softeners

Discusses why and how to disinfect water softeners.

Sodium or calcium hypochlorite

Provides instructions for using hypochlorite for disinfection.

Electro chlorination

Briefly mentions electro chlorination as a sanitization method.

Operation

Recommendations

Offers recommendations for optimal system operation and salt usage.

Manual regeneration

Explains how to initiate manual regeneration cycles.

To advance regeneration cycles

Describes how to manually step through regeneration cycles.

To cancel a regeneration

Provides instructions on how to cancel an ongoing regeneration.

Maintenance

General system inspection

Outlines periodic general inspections for the system.

Water quality

Specifies checking raw and treated water hardness.

Mechanical Checks

Details mechanical checks, leak inspections, and electrical connections.

Regeneration test

Explains how to perform a regeneration test and record results.

Recommended maintenance plan

Provides a schedule for recommended maintenance tasks over several years.

Recommendations

Offers recommendations on spare parts and lubricants.

Use original spare parts

Emphasizes using genuine Pentair spare parts for replacements.

Use original approved lubricants

Lists approved lubricants for maintenance.

Maintenance instructions

Provides general maintenance instructions, including disinfection and testing.

Cleaning and maintenance

Outlines the initial steps before performing cleaning or maintenance.

First steps

Details essential preliminary steps before any cleaning or maintenance.

Injector cleaning

Step-by-step guide for cleaning the injector components.

Refill controller cleaning

Instructions for cleaning the refill controller and its parts.

Injector screen cap cleaning

Explains how to clean the injector screen cap and basket.

Backwash controller cleaning

Provides steps for cleaning the backwash controller.

Air check valve cleaning

Details the procedure for cleaning the air check valve.

Valve from tank disassembly

Guides on disassembling the valve from the tank for easier access.

Motor and camshaft replacement

Provides instructions for replacing the motor and camshaft.

Optical sensor and controller replacement

Explains how to replace the optical sensor and controller module.

Top plate and disc valve replacement

Details the process for replacing the top plate and disc valves.

Valve on tank assembly

Guides on assembling the valve back onto the tank.

Troubleshooting

Err. code

Lists error codes, their causes, and recovery steps.

Spare parts

Valve parts list

Provides an exploded view and list of valve components.

Options and special kits

Lists optional components and special kits available for the controller.

Meter adapter

Details the meter adapter kit and related parts.

Piping boss (manifold)

Lists various piping bosses and elbows for manifold connections.

Bypass & connections

Shows bypass body and related connection kits and adapters.

Valve installation kits

Lists specific kits for valve installation and components.

Disposal

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Pentair Autotrol 255 Logix 740-760 User Manual

Table of Contents

Questions and Answers:

Pentair Autotrol 255 Logix 740-760 Specifications

Summary

Generalities

Scope of the documentation

Release management

Manufacturer identifier, product

Intended use

Abbreviations used

Norms

Applicable norms

Available certificates

Procedure for technical support

Copyright

Limitation of liability

Scan & Service application

Safety

Safety pictograms definition

Serial and safety tags location

Hazards

Personnel

Material

Hygiene and sanitization

Sanitary issues

Hygiene measures

Description

Technical specifications

Performance flow rate characteristics

Outline drawing

Description and components location

System regeneration cycle (8-cycles operation)

System sizing

Recommendations

Injector/DLFC/Refill flow controler-Valve configuration

Cycle time calculation

Injector flow rates (tables)

Salt amount definition

Installation

Safety notices for installation

Installation environment

General

Electrical

Mechanical

Outdoor Locations

Integration constraints

Block diagram and configuration example

Valve connection to piping

Top-mounted valve installation

Connections (electrical)

Bypassing

Drain line connection

Overflow line connection

Brine line connection

Programming

Display

Commands

Basic programming

Basic programming mode chart

Program system size

Time setting and winter time - summer time change

Day of week

Regeneration time

Days to regenerate (740 time-clock controller only)

Calendar override (760 on-demand controller only)

Amount of brine used per regeneration

Estimated capacity

Hardness (760 on-demand controller only)

Advanced programming

Master setting reference chart

Cycle time programming

Diagnostic

Resetting the controller

Commissioning

Water filling, draining and waterproofness inspection

Activating the softener

Additional tips

Sanitization

Disinfection of water softeners