Pentair Autotrol 255 Logix 740-760 User guide

AUTOTROL
255 LOGIX 740-760
INSTALLER
MANUAL
WATER PURIFICATION

Installer Manual 255-LOGIX 740-760 - Table of content
2 / 76 Ref. MKT-IM-001 / C - 08.10.2019
Table of content
1. Generalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1. Scope of the documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.2. Release management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3. Manufacturer identifier, product . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4. Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5. Abbreviations used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.6. Norms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.6.1. Applicable norms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.6.2. Available certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.7. Procedure for technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.8. Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.9. Limitation of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.10. Scan & Service application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2. Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1. Safety pictograms definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2. Serial and safety tags location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3. Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3.1. Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3.2. Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4. Hygiene and sanitization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4.1. Sanitary issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4.2. Hygiene measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1. Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.1.1. Performance flow rate characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2. Outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3. Description and components location . . . . . . . . . . . . . . . . . . . . . . .16
3.4. System regeneration cycle (8-cycles operation) . . . . . . . . . . . . . . . 17
4. System sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1. Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.1. Injector/DLFC/Refill flow controler-Valve configuration . . . . . . . . . . . 19
4.2. Cycle time calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.3. Injector flow rates (tables) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4. Salt amount definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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5. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
5.1. Safety notices for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2. Installation environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2.1. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2.2. Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2.3. Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2.4. Outdoor Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.3. Integration constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.4. Block diagram and configuration example . . . . . . . . . . . . . . . . . . 26
5.5. Valve connection to piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.5.1. Top-mounted valve installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.6. Connections (electrical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.7. Bypassing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.8. Drain line connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.9. Overflow line connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.10. Brine line connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6. Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
6.1. Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.2. Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.3. Basic programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3.1. Basic programming mode chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3.2. Program system size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.3.3. Time setting and winter time - summer time change . . . . . . . . . . . . . 37
6.3.4. Day of week . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.3.5. Regeneration time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.3.6. Days to regenerate (740 time-clock controller only) . . . . . . . . . . . . . . 38
6.3.7. Calendar override (760 on-demand controller only) . . . . . . . . . . . . . . 39
6.3.8. Amount of brine used per regeneration . . . . . . . . . . . . . . . . . . . . . . . . 39
6.3.9. Estimated capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.3.10. Hardness (760 on-demand controller only) . . . . . . . . . . . . . . . . . . . . . 40
6.4. Advanced programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.4.1. Master setting reference chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.2. Cycle time programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.4.3. Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.4.4. Resetting the controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

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7. Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.1. Water filling, draining and waterproofness inspection . . . . . . . . .45
7.1.1. Activating the softener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.1.2. Additional tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2. Sanitization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2.1. Disinfection of water softeners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2.2. Sodium or calcium hypochlorite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.2.3. Electro chlorination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8.1. Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8.2. Manual regeneration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8.3. To advance regeneration cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
8.4. To cancel a regeneration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.1. General system inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.1.1. Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.1.2. Mechanical Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.1.3. Regeneration test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.2. Recommended maintenance plan . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.3. Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.3.1. Use original spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.3.2. Use original approved lubricants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.3.3. Maintenance instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.4. Cleaning and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.4.1. First steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.4.2. Injector cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.4.3. Refill controller cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.4.4. Injector screen cap cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.4.5. Backwash controller cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.4.6. Air check valve cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
9.4.7. Valve from tank disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.4.8. Motor and camshaft replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9.4.9. Optical sensor and controller replacement . . . . . . . . . . . . . . . . . . . . . . 60
9.4.10. Top plate and disc valve replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.4.11. Valve on tank assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
10. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

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11. Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
11.1. Valve parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
11.2. Options and special kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
12. Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Installer Manual 255-LOGIX 740-760 - Generalities
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1. Generalities
1.1. Scope of the documentation
The documentation provides the necessary information for appropriate use of the product. It informs
the user to ensure efficient execution of the installation, operation or maintenance procedures.
The content of this document is based on the information available at the time of publication. The
original version of the document was written in English.
For safety and environmental protection reasons, the safety instructions given in this documentation
must be strictly followed.
This manual is a reference and will not include every system installation situation. The person
installing this equipment should have:
• training in the 700 Logix series controllers and water softener installation;
• knowledge of water conditioning and how to determine proper controller settings;
• basic plumbing skills.
This document is available in other languages on https://www.pentairaquaeurope.com/product-
finder/product-type/control-valves.
1.2. Release management
1.3. Manufacturer identifier, product
Manufacturer: Pentair International LLC
Avenue de Sevelin 18
1004 Lausanne
Switzerland
Product: 255-LOGIX 740-760
1.4. Intended use
The device is intended to be used for domestic applications only and it is purpose-built for water
treatment.
Revision Date Authors Description
A18.11.2016 STF/FLA First edition.
B23.05.2018 BRY/FLA Address change, Bleam information and valve on
tank assembly.
C08.10.2019 STF General corrections.

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1.5. Abbreviations used
BLFC ................................................................................. Brine Line Flow Controller
DF...................................................................................... Down Flow
DLFC ................................................................................. Drain Line Flow Controller
Inj ...................................................................................... Injector
PN ..................................................................................... Part Number
QC...................................................................................... Quick Connect
Regen ................................................................................ Regeneration
SBV.................................................................................... Safety Brine Valve
TC ...................................................................................... Time Clock
UF...................................................................................... Up Flow
1.6. Norms
1.6.1. Applicable norms
Comply with the following guidelines:
• 2006/42/EC: Machinery Directive;
• 2014/35/UE: Low Voltage Directive;
• 2014/30/UE: Electromagnetic compatibility;
• 2011/65/EC: Restriction of use of certain hazardous substances in electrical and electronic
equipment (RoHS).
• UNI EN ISO9001.
Meets the following technical standards:
• IEC/EN 60335-1
• IEC 61010-1
• EN 55014-1
• EN 55014-2
• EN 61000-3-2: 2006 + A1: 2009 + A2: 2009
• EN 61000-3-3: 2008
• EN 61000-6-2: 2005
• EN 61000-6-3: 2007 + A1: 2011
• EN 61326-1
1.6.2. Available certificates
•CE
•DM174
•ACS
Please find beside the certifications for
some of our product families. Please
note that this list is not an exhaustive list
of all our certifications. In case of need
for more information please contact us.

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1.7. Procedure for technical support
Procedure to follow for any technical support request:
ACollect the required information for a technical assistance request.
→ Product identification (see 2.2. Serial and safety tags location, page 10 and 
9.3. Recommendations, page 54);
→ Problem description of the device.
BPlease refer to the "Troubleshooting" chapter, page 63. If the problem persists contact your
supplier.
1.8. Copyright
© 2019 Pentair International Sàrl All rights reserved.
1.9. Limitation of liability
Pentair Quality System EMEA products benefit, under specific conditions, from a manufacturer
warranty that may be invoked by Pentair’s direct customers. Users should contact the vendor of this
product for applicable conditions and in case of a potential warranty claim.
Any warranty provided by Pentair regarding the product will become invalid in case of:
• improper installation, improper programming, improper use, improper operation and/or
maintenance leading to any kind of product damages;
• improper or unauthorized intervention on the controller or components;
• incorrect, improper or wrong connection/assembly of systems or products with this product and
vice versa;
• use of a non-compatible lubricant, grease or chemicals of any type and not listed by the
manufacturer as compatible for the product;
• failure due to wrong configuration and/or sizing.
Pentair accepts no liability for equipment installed by the user upstream or downstream of Pentair
products, as well as for process/production processes which are installed and connected around or
even related to the installation. Disturbances, failures, direct or indirect damages that are caused by
such equipment or processes are also excluded from the warranty. Pentair shall not accept any
liability for any loss or damage of profits, revenues, use, production, or contracts, or for any indirect,
special or consequential loss or damage whatsoever. Please refer to the Pentair List Price to know
more about terms and conditions applicable to this product.

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1.10. Scan & Service application
Scan & Service mobile application is the ideal support for the maintenance person in his daily
business. A simple scan of an identification (ID) label (1) present on the valve with a smartphone gives
an instantaneously access to all updated information related to the product, such as:
• valve’s and tanks detailed configuration;
•manuals;
• spare parts lists;
• troubleshooting recommendations;
• multi-lingual videos, detailing how to best service a part;
• informations about new products, latest technologies, novelties about the Blue Network
program, etc....
No. Operation
ADownload the application "Scan & Service" from or in a
smartphone (4).
BOpen the application "Scan & Service".
CScan the bleam (3) stuck on the valve (2).
DNavigate to find information.

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2. Safety
2.1. Safety pictograms definition
2.2. Serial and safety tags location
Note
Ensure that the serial label and the safety tags on the device are completely legible and
clean. If necessary, replace them with new tags and put them in the same places.
Caution
Warns of a risk of minor injury or major
material damage to the device or
environment.
Warning
Warns against serious personal injury
and damage to health.
Danger
Warns against serious personal injury or
death.
Mandatory
Standard or measure to apply.
Note
Comment.
Prohibition
Restriction to be observed.
Model
Electrical rating
Part number
Production date
Production order
Serial number

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2.3. Hazards
All the safety and protection instructions contained in this document must be observed in order to
avoid temporary or permanent injury, damage to property or environmental pollution.
At the same time, any other legal regulations, accident prevention and environmental protection
measures, as well as any recognized technical regulations relating to appropriate and risk-free
methods of working which apply in the country and place of use of the device must be adhered to.
Any non-observation of the safety and protection rules, as well as any existing legal and technical
regulations, will result in a risk of temporary or permanent injury, damage to property or
environmental pollution.
2.3.1. Personnel
Caution
Only qualified and professional personnel, based on their training, experience and
instruction as well as their knowledge of the regulations, the safety rules and operations
performed, are authorized to carry out necessary work.
2.3.2. Material
The following points must be observed to ensure proper operation of the system and the safety of
user:
• do not remove the locking bar;
• be careful of high voltages present on the transformer (230V);
• do not put your fingers in the system (risk of injuries with moving parts and shock due to electric
voltage).
2.4. Hygiene and sanitization
2.4.1. Sanitary issues
Preliminary checks and storage
• Check the integrity of the packaging. Check that there is no damage and no signs of contact with
liquid to make sure that no external contamination occurred;
• the packaging has a protective function and must be removed just before installation. For
transportation and storage appropriate measures should be adopted to prevent the
contamination of materials or objects themselves.

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Assembly
• Assemble only with components which are in accordance with DM 174 and ACS;
• after installation and before use, perform one or more manual regenerations in order to clean
the media bed. During such operations, do not use the water for human consumption. Perform a
disinfection of the system in the case of installations for treatment of drinking water for human
use.
Note
This operation must be repeated in the case of ordinary and extraordinary maintenance. It
should also be repeated whenever the system remains idle for a significant time.
Note
Valid only for Italy: In case of equipment used in accordance with the DM25, apply all the
signs and obligations arising from the DM25.
2.4.2. Hygiene measures
Disinfection
• The materials used for the construction of our products meet the standards for use with potable
water; the manufacturing processes are also geared to preserving these criteria. However, the
process of production, distribution, assembly and installation, may create conditions of bacterial
proliferation, which may lead to odor problems and water contamination;
• it is therefore strongly recommended to sanitize the products. See 7.2. Sanitization, page 47;
• maximum cleanliness is recommended during the assembly and installation;
• for disinfection, use Sodium or Calcium Hypochlorite and perform a manual regeneration.

Installer Manual 255-LOGIX 740-760 - Description
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3. Description
3.1. Technical specifications
Design specifications/ratings
Valve body ......................................................................... Glass-filled Noryl®- NSF listed material
Rubber components ......................................................... Compounded for cold water - NSF listed
material
Valve material certification .............................................. WQA Gold Seal Certified to ORD 0902, NSF/
ANSI 44, CE, ACS
Weight (valve with controller)........................................... 1.8 kg
Recommended operating pressure ................................. 1.4 - 8.6 bar
Hydrostatic test pressure................................................. 20.69 bar
Water temperature........................................................... 1 - 38°C
Ambient temperature ....................................................... 2 - 50°C
Flow rates (valve only)
Service at 1.03 bar (15 psi) drop....................................... 3.52 m3/h
Backwash at 1.72 bar (25 psi) drop .................................. 1.36 m3/h
Service .............................................................................. Kv = 3.4 m3/h (Cv = 3.99 gpm)
Backwash.......................................................................... Kv = 1.0 m3/h (Cv = 1.20 gpm)
Valve connections
Tank Adapter Thread ........................................................ 63.5 mm (2½") - 8, male
Inlet/Outlet Maniflold ....................................................... 25.4 mm (1") NPT or BSPT, female (brass or
thermoplastic) 19 mm (¾") NPT or BSPT,
male (thermoplastic) 2.7 (½") NPT or BSPT,
male (thermoplastic)
Drain line 12.7 mm (½") (manifold
dependent)
Brine line .......................................................................... 9.5 mm (⅜") NPT as standard, 6.35 mm (¼")
NPT optional; air check built onto valve
Riser tube [Ø].................................................................... 27 mm (1.050") standard, or 20.6 mm
(0.8125") optional with extra insert
Riser tube [length]............................................................ 29 mm ± 3 mm (1⅛ ± ⅛") above top of tank
Electrical
Controller Operating Voltage ........................................... 12 VAC (requires use of Pentair Water
supplied transformer)
Input Supply Frequency.................................................... 50 or 60 Hz (controller configuration
dependent)
Motor Input Voltage .......................................................... 12 VAC
Controller Power Consumption ....................................... 3 W average
Protection rating............................................................... IP23

Installer Manual 255-LOGIX 740-760 - Description
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3.1.1. Performance flow rate characteristics
The graph shows the pressure drop created by the valve itself at different flow rates. It makes it
possible to predetermine the maximum flow rate going through the valve depending on the system
settings (inlet pressure etc). It also makes it possible to determine the valve pressure drop at a given
flow rate, and therefore to evaluate the system pressure drop vs flow rate.
Flow rate (m3/h)
Pressure drop (bar)
Backwash
Service
FLOW RATE VS PRESSURE DROP

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3.2. Outline drawing

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3.3. Description and components location
LCD display
DOWN button
SET button
UP button
Manual REGEN button
Control module mount
BLFC / Refill
controller
Injector and cap
Check ball
Air check
Brine tank tube
connection
Manifold
connection
One-piece valve disc spring
Valve discs
Optical sensor
Camshaft
Motor
Turbine cable connection
Drain
Inlet
Backwash flow drain controller
Locking bar
Injector screen
Outlet
Manifold

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3.4. System regeneration cycle (8-cycles operation)
Service (downflow) — cycle C0
Untreated water is directed down through the resin bed and up through the riser tube. The hardness
ions attach themselves to the resin and are removed from the raw water being exchanged on the resin
beads towards sodium ions. The water is conditioned as it passes through the resin bed.
Backwash (upflow) — cycle C1
The flow of water is reversed by the valve and directed down the riser tube and up through the resin
bed. During the backwash cycle, the bed is expanded and debris is flushed to the drain, while the
media bed is remixed.
Brine draw & slow rinse — cycle C2-C3
The controller directs water through the brine injector and brine is drawn from the brine tank. The
brine is then directed down through the resin bed and up through the riser tube to the drain. The
hardness ions are displaced by sodium ions and are sent to the drain. When the air check valve closes
brine drawing finishes, and then the slow rinse phase starts. The resin is regenerated during the brine
draw and slow rinse cycles.
Repressurize cycle (hard water bypass flapper open) — cycle C4
This cycle allows the air and water to hydraulically balance in the valve before continuing the
regeneration.
Fast rinse (downflow) — cycle C5
The controller value directs water down through the resin bed and up through the riser tube to the
drain. Any residual brine is rinsed from the resin bed, while the media bed is re-compacted.
2nd Backwash (upflow) — cycle C6
2nd Fast rinse (downflow) — cycle C7
Brine refill — cycle C8
Water is directed to the brine tank at a rate controlled by the refill controller, to create brine for the
next regeneration. During brine refill, treated water is already available at the valve outlet.
Note
For illustration purpose only. Always verify inlet and outlet marking on the valve.

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From brine
tank
To brine
Tank
BRINE/SLOW RINSE
C2-C3
BACKWASH
C1 and C6
SERVICE
C0
REPRESSURIZE
C4
RAPID RINSE
C5 and C7
BRINE REFILL
C8
Valve
Valve
Valve
Valve Valve
Valve
Inlet Outlet Inlet Outlet
Inlet Outlet Inlet Outlet
Inlet Outlet Inlet Outlet
Drain
Drain
Drain

Installer Manual 255-LOGIX 740-760 - System sizing
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4. System sizing
4.1. Recommendations
4.1.1. Injector/DLFC/Refill flow controler-Valve configuration
4.2. Cycle time calculation
All the Logix controller range automatically calculates the unit capacity as well as the cycle time.
No calculations are therefore required.
Vessel diameter
[In]
Media volume
[L]
Injector Flow
control
Refill flow control
[gpm]
Backwash flow
control
[gpm]
65/10 E [yellow] 0.33 0.9
715 F [peach] 0.33 1.2
820 G [tan] 0.33 1.6
930 H [lt purple] 0.33 2.0
10 35 J [lt blue] 0.33 2.5
12 40 K [pink] 0.33 3.5
13 50 L [orange] 0.33 4.1
14 80 L [orange] 0.33 4.8

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4.3. Injector flow rates (tables)
The following tables represent the injectors flow rate as a function of the inlet pressure for the
different injector sizes.
TOTAL
Inlet pressure [bar]
Injector "F" (Peach)
For 7" Tanks
Injector "G" (Tan)
For 8" Tanks Injector "H" (Light Purple)
For 9" Tanks
Flow rate [l/min]
RINSEBRINE DRAW
Injector "E" (Yellow)
For 6" Tanks
Inlet pressure [bar]
Flow rate [l/min]
Inlet pressure [bar]
Flow rate [l/min]
Inlet pressure [bar]
Flow rate [l/min]