Pentair Fleck 2850 NXT Installer Manual
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Pentair Fleck 2850 NXT Installer Manual

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INSTALLER MANUAL
Fleck 2850 NXT/NXT2
IMPORT ANT SA FETY INSTR UCTIO NS
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  • Page 1 INSTALLER MANUAL Fleck 2850 NXT/NXT2 IMPORT ANT SA FETY INSTR UCTIO NS Read and follow all instructions Save these instructions WWW.PENTAIR.EU...

  • Page 2: Table Of Contents

    Installer manual Fleck 2850 NXT/NXT2 - Table of Contents Table of Contents Generalities ..................Scope of the documentation ............... Release management ................. Manufacturer identifier, product ..............Intended use....................Abbreviations used..................Norms......................1.6.1 Applicable norms ....................1.6.2 Available certificates................... Procedure for technical support ..............
  • Page 3 Installer manual Fleck 2850 NXT/NXT2 - Table of Contents System sizing................... 32 Recommended Injector/DLFC/BLFC-Valve configuration......32 Sizing a softener (single unit) ..............32 4.2.1 Parameters to be considered ................4.2.2 Determining the required volume of resin ............4.2.3 Resin exchange capacity and capacity of the unit ..........
  • Page 4 Installer manual Fleck 2850 NXT/NXT2 - Table of Contents 5.13 Brine line connection .................. 68 Programming .................. 69 NXT controller..................... 69 6.1.1 Display ......................... 6.1.2 Commands ......................6.1.3 Setting the time of the day .................. 6.1.4 Basic programming mode ..................
  • Page 5 Installer manual Fleck 2850 NXT/NXT2 - Table of Contents Recommended maintenance plan.............. 139 9.2.1 Valve used for softening..................139 9.2.2 Valve used for filtration..................141 Recommendations ..................142 9.3.1 Use original spare parts ..................142 9.3.2 Use original approved lubricants................ 142 9.3.3...

  • Page 6: Generalities

    • training in the Fleck series, NXT/NXT2 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.pentair.eu/product-finder/product- type/control-valves. Release management...

  • Page 7: Intended Use

    Installer manual Fleck 2850 NXT/NXT2 - Generalities Intended use The device is intended for industry environment use only and it is purpose-built for water treatment. Abbreviations used Assy Assembly BLFC Brine Line Flow Controller Brine Valve Cold Water Down Flow...

  • Page 8: Available Certificates

    Page 156]. If the problem persists contact your supplier. Copyright and Trademarks All indicated Pentair trademarks and logos are property of Pentair. Third party registered and unregistered trademarks and logos are the property of their respective owners. © 2023 Pentair. All rights reserved.

  • Page 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.

  • Page 10: Pentair Scan Application

    1.10 Pentair Scan application Pentair Scan mobile application is the ideal support for the maintenance person in his daily business. A simple scan of the serial label present on the valve with a smartphone gives an instantaneously access to all updated information related to the product, such as: •...

  • Page 11: Safety

    Installer manual Fleck 2850 NXT/NXT2 - Safety Safety Safety pictograms definition DANGER This combination of symbol and keyword indicates an imminently hazardous situation that will result in serious or fatal injury if not avoided. WARNING This combination of symbol and keyword indicates a potentially hazardous situation that can result in serious or fatal injury if not avoided.

  • Page 12: Serial Label Location

    Installer manual Fleck 2850 NXT/NXT2 - Safety Serial label location Model Part number Electrical rating Serial number Production date Production order Mandatory Ensure that the serial label and the safety labels on the device are completely legible and clean ! If necessary, replace them with new labels in the same positions.

  • Page 13: Hygiene And Sanitization

    Installer manual Fleck 2850 NXT/NXT2 - Safety • do not put your fingers in the system (risk of injuries with moving parts and shock due to electric voltage). 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;...

  • Page 14: Description

    Installer manual Fleck 2850 NXT/NXT2 - Description Description Technical specifications Design specifications/ratings Valve body Brass Rubber components EP or EPDM Weight (valve with controller) 10.0 kg (max) Recommended operating pressure 1.8 - 8.6 bar Maximum inlet pressure 8.6 bar Hydrostatic test pressure...
  • Page 15 Installer manual Fleck 2850 NXT/NXT2 - Description Electrical Controller operating voltage 24 VAC for NXT / 24 VDC for NXT2 Input supply frequency 50 or 60 Hz Transformer output voltage 24 VAC for NXT / 24 VDC for NXT2 Motor input voltage until March 2019 24 VAC...

  • Page 16: Performance Flow Rate Characteristics

    Installer manual Fleck 2850 NXT/NXT2 - Description Performance flow rate characteristics The graph shows the pressure drop created by the valve itself at different flow rates. It allows predetermining the maximum flow rate going through the valve depending on the system settings (inlet pressure etc).

  • Page 17: Outline Drawing

    Installer manual Fleck 2850 NXT/NXT2 - Description Outline drawing Ref. MKT-IM-031 / D - 16.01.2023 17 / 174...

  • Page 18: Components Description And Location

    Installer manual Fleck 2850 NXT/NXT2 - Description Components description and location 3.4.1 With NXT controller and AC motor Power head Drain line Brine valve Brine line Injector block Inlet 18 / 174 Ref. MKT-IM-031 / D - 16.01.2023...
  • Page 19 Installer manual Fleck 2850 NXT/NXT2 - Description AC motor Piston NXT controller Micro-switches Camshaft Ref. MKT-IM-031 / D - 16.01.2023 19 / 174...
  • Page 20 Installer manual Fleck 2850 NXT/NXT2 - Description Status LED Display Diagnostic button Setting button Shift button Regeneration button 20 / 174 Ref. MKT-IM-031 / D - 16.01.2023...

  • Page 21: With Nxt Controller And Dc Motor

    Installer manual Fleck 2850 NXT/NXT2 - Description 3.4.2 With NXT controller and DC motor Info As of April 2019, NXT valves are supplied with 24 VDC motor. This motor is equipped with an AC-DC converter allowing it to be powered with 24 VAC or 24 VDC. Therefore, when used with NXT boards which require 24 VAC power supply and therefore send...
  • Page 22 Installer manual Fleck 2850 NXT/NXT2 - Description Status LED Display Diagnostic button Setting button Shift button Regeneration button 22 / 174 Ref. MKT-IM-031 / D - 16.01.2023...
  • Page 23 Installer manual Fleck 2850 NXT/NXT2 - Description AC to DC converter Camshaft DC motor Piston NXT controller Micro-switches Ref. MKT-IM-031 / D - 16.01.2023 23 / 174...

  • Page 24: With Nxt2 Controller And Dc Motor

    Installer manual Fleck 2850 NXT/NXT2 - Description 3.4.3 With NXT2 controller and DC motor AC to DC converter DC motor Piston NXT2 controller Camshaft Micro-switches 24 / 174 Ref. MKT-IM-031 / D - 16.01.2023...
  • Page 25 Installer manual Fleck 2850 NXT/NXT2 - Description Power head Drain line Brine valve Brine line Injector block Inlet Ref. MKT-IM-031 / D - 16.01.2023 25 / 174...

  • Page 26: System Regeneration Cycle

    Installer manual Fleck 2850 NXT/NXT2 - Description System regeneration cycle Info This valve allows to do filtration and down flow regenerations. 3.5.1 Downflow regeneration cycle (5-cycles operation) Service — normal use 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 by sodium ions.
  • Page 27 Installer manual Fleck 2850 NXT/NXT2 - Description SERVICE NORMAL USE BACKWASH Outlet Inlet Outlet Inlet Drain Valve Valve BRINE DRAW & SLOW RINSE RAPID RINSE Outlet Inlet Outlet Inlet Drain Drain Valve Valve From brine tank BRINE TANK REFILL PAUSE & DELAY...

  • Page 28: Filter Cycle (3-Cycles Operation)

    Installer manual Fleck 2850 NXT/NXT2 - Description 3.5.2 Filter cycle (3-cycles operation) Service — normal use Untreated water is directed down through the filter media and up through the riser tube. The impurities are retained by the media. The water is filtered as it passes through the media.
  • Page 29 Installer manual Fleck 2850 NXT/NXT2 - Description SERVICE NORMAL USE BACKWASH Outlet Inlet Outlet Inlet Drain Valve Valve SERVICE RAPID RINSE NORMAL USE Outlet Inlet Outlet Inlet Drain Valve Valve Untreated water, with WBP piston only Ref. MKT-IM-031 / D - 16.01.2023...

  • Page 30: Configurations For Softener, No By Pass And Filter

    Installer manual Fleck 2850 NXT/NXT2 - Description Configurations for softener, no by pass and filter 3.6.1 Downflow softener The valve is mounted with the NXT/NXT2 power head 2510/2750/2850, part number PH275NC-001 and a 1600 or 1700/1710 injector assembly. NXT/NXT2 power head...

  • Page 31: Filter

    Installer manual Fleck 2850 NXT/NXT2 - Description 3.6.3 Filter The valve is mounted with the NXT/NXT2 power head 2510/2750/2850, part number PH275NC-001 and a kit injector for filter customization 2750/2850/2910, part number 29249. NXT/NXT2 power head 2510/2750/2850 Kit injector for filter customization Ref.

  • Page 32: System Sizing

    Installer manual Fleck 2850 NXT/NXT2 - System sizing System sizing Recommended Injector/DLFC/BLFC-Valve configuration Brine Tank Resin Injector DLFC BLFC syst. Diameter volume [in] Color Color [gpm] DF [gpm] UF [gpm] 2850/ 35 – 42 White 0.50 1600 43 – 56...

  • Page 33: Determining The Required Volume Of Resin

    Installer manual Fleck 2850 NXT/NXT2 - System sizing Caution - material Risk of leakage due to unrespected service velocity ! Failure to respect the service velocity will lead to hardness leakage or even total softener inefficiency. Note that the water supply piping size may also be useful when estimating the nominal flow rate, since the size of the piping allows a maximum flow rate to pass.

  • Page 34: Resin Exchange Capacity And Capacity Of The Unit

    Installer manual Fleck 2850 NXT/NXT2 - System sizing 4.2.3 Resin exchange capacity and capacity of the unit The resin exchange capacity and capacity of the unit are two different things that should not be confused. The resin exchange capacity is the amount of Ca...

  • Page 35: Valve Configuration

    Installer manual Fleck 2850 NXT/NXT2 - System sizing To calculate the system mass capacity: × C with: capacity resin resin ex : system mass capacity [g as CaCO capacity : volume of resin [L] resin : resin exchange capacity [g/L...

  • Page 36: Cycle Time Calculation

    Installer manual Fleck 2850 NXT/NXT2 - System sizing The DLFC installed on the valve has to limit the backwash flow rate to the above calculated flow rate. To determine the injector size: The velocities to be respected for brine draw and slow rinse are given on the resin manufacturer specifications.
  • Page 37 Installer manual Fleck 2850 NXT/NXT2 - System sizing To calculate the backwash duration: = (N × BV) / Q with: backwash BVbw DLFC : backwash duration [min] backwash : number of bed volume for backwash BVbw BV: bed volume [L]...
  • Page 38 Installer manual Fleck 2850 NXT/NXT2 - System sizing Depending on the valve type, the fast rinse flow rate is controlled by the DLFC or it has about the same flow rate as in service. The fast rinse velocity can be the same as the service velocity, and the volume of water to be used for the fast rinse is generally between 1 and 10 BV depending on the salt dosage.

  • Page 39: Salt Amount Definition

    Installer manual Fleck 2850 NXT/NXT2 - System sizing Salt amount definition The salt settings are controlled through the controller programming. See Resin exchange capacity and capacity of the unit [ → Page 34]. Injector flow rates The following graphics represent the injectors flow rate as a function of the inlet pressure for the different injector sizes.

  • Page 40: 1650 Injectors

    Installer manual Fleck 2850 NXT/NXT2 - System sizing INJECTOR 3 Total Rinse Draw Inlet pressure [bar] 4.4.2 1650 injectors INJECTOR 1 Total Rinse Draw Inlet pressure [bar] INJECTOR 2 Total Rinse Draw Inlet pressure [bar] 40 / 174 Ref. MKT-IM-031 / D - 16.01.2023...

  • Page 41: 1700/1710 Injectors

    Installer manual Fleck 2850 NXT/NXT2 - System sizing INJECTOR 3 Total Rinse Draw Inlet pressure [bar] 4.4.3 1700/1710 injectors INJECTOR 3C Total Rinse Rinse Draw Draw Inlet pressure [bar] INJECTOR 4C Total Rinse Draw Inlet pressure [bar] Ref. MKT-IM-031 / D - 16.01.2023...
  • Page 42 Installer manual Fleck 2850 NXT/NXT2 - System sizing INJECTOR 5C Total Rinse Draw Inlet pressure [bar] 42 / 174 Ref. MKT-IM-031 / D - 16.01.2023...

  • Page 43: Installation

    Installer manual Fleck 2850 NXT/NXT2 - Installation Installation CAUTION Risk of injury due to electrical shock or pressurized elements ! It is strictly forbidden for not qualified personal, to accede to system’s internal parts to perform any kind of technical action.

  • Page 44: Water

    Installer manual Fleck 2850 NXT/NXT2 - Installation • keep the media tank in an upright position. Do not turn on its side, upside down, or drop it. Turning the tank upside down may cause media to enter the valve or might clog the upper screen;...

  • Page 45: Mechanical

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.3.4 Mechanical Caution - material Risk of damage due to wrong lubricant use ! Do not use petroleum-based lubricants such as vaseline, oils, or hydrocarbon-based lubricants. Use only approved silicone grease or soapy water ! •...
  • Page 46 Installer manual Fleck 2850 NXT/NXT2 - Installation • total minimum pipe run to water heater of 3 m to prevent backup of HW into system; • always install check valve before water heater to protect the softener from HW return; • local drain for discharge as close as possible;...

  • Page 47: Block Diagram And Configuration Example

    Installer manual Fleck 2850 NXT/NXT2 - Installation Block diagram and configuration example Block diagram Pressure gauge Main inlet User’s line Check valve to prevent water harm Filter cartridge By-pass Pressure regulator Meter Suggested options Drain line Brine line Valve Brine tank...

  • Page 48: Valve On Tank Assembly

    Installer manual Fleck 2850 NXT/NXT2 - Installation Side mounted configuration example 2850 NXT/NXT2 A2727-63 61415-20 BV1600: 60067-03 BV1700: 25453 BV1600: 18168(CW) A-2816-63 23473(HW) BV1700: 18979(CW) 18980(HW) Valve on tank assembly 1. Lubricate the seals with approved silicone grease. 2. Spin the valve (1) onto the tank (2), ensuring the threads are not cross-threaded.

  • Page 49: Valve Connection To Piping

    Installer manual Fleck 2850 NXT/NXT2 - Installation ¼ turn Point 0 Point 0 ½ turn Valve connection to piping The connections should be hand tightened using PTFE (plumber’s tape) on the threads if using the threaded connection type. In case of heat welding (metal type connection), the connections should not be made to the valve when soldering.
  • Page 50 Installer manual Fleck 2850 NXT/NXT2 - Installation Support to the wall min 200 mm flexible min 200 mm flexible Support to the wall • The diagrams above illustrate how the flexible piping connection should be mounted; • in order to adequately compensate the tank elongation the flexible tubes must be installed horizontally;...
  • Page 51 Installer manual Fleck 2850 NXT/NXT2 - Installation • in any case, any failure caused by improper installations and/or piping connections may void the warranty of Pentair products; • in the same way, using lubricant* [ → Page 51] on the valve thread is not allowed and will void the warranty for the valve and tank.

  • Page 52: Side-Mounted Valve Installation

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.7.2 Side-mounted valve installation Valid for location having a reduced height. Inlet Inlet shutoff Manual shutoff valve bypass Rubber expansion joint Outlet Fleck meter Tank Outlet shutoff Drain line Support tripod Rubber expansion joint •...

  • Page 53: Regeneration Flows

    Installer manual Fleck 2850 NXT/NXT2 - Installation Regeneration flows Mandatory For all multiple tank systems 5 and 6, NBP version valves must be used ! For all multiple tank systems 7, 8 (for NXT2 only), 9 and 14, WBP version valves must be used in combination with solenoid valves in the outlet !

  • Page 54: Single Valve (System 4)

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.8.1 Single valve (System 4) As named, this system works with only one valve. The regen can be initiated upon the treated volume (delayed or immediate), time clock mode or an external remote regen signal or day of week (NXT2 controller only).

  • Page 55: Duplex Alternating Immediate System (System 7)

    Installer manual Fleck 2850 NXT/NXT2 - Installation During normal operation, the controllers of each valve display the time of day and the volume of water remaining. The remaining volume is the total volume of the system. The remaining volume displayed drops with water consumption to reach zero. When this happens, if no other valve is regenerating, the lead valve starts regeneration while sending out a regeneration lock out signal to all other valves of the system.

  • Page 56: Duplex Alternating Delayed System (System 8) (Nxt2 Only)

    Installer manual Fleck 2850 NXT/NXT2 - Installation Inlet Outlet Valve Meter Tank Check valve 5.8.5 Duplex alternating delayed system (System 8) (NXT2 only) This system works with 2 valves and a meter. During normal operation, the controller of each valve displays the time of day and the volume of water remaining.

  • Page 57: Multiple Valves, System On-Demand (System 14)

    Installer manual Fleck 2850 NXT/NXT2 - Installation Inlet Outlet Valve Tank Check valve Service Service Service Stand-By 100% Meter 5.8.7 Multiple valves, system on-demand (System 14) This system type may be used to build systems from 2 to 4 valves for NXT controller, 2 to 8 valves for NXT2.
  • Page 58 Installer manual Fleck 2850 NXT/NXT2 - Installation Inlet Outlet Valve Tank Check valve First trip Service Stand-By Stand-By point (primary Meter tank) Total flow rate is split between two meters The flow rate demand decreases below the first trip point. The tank returns to standby.
  • Page 59 Installer manual Fleck 2850 NXT/NXT2 - Installation Inlet Outlet Valve Tank Check valve Service Service Service Stand-By Meter Total flow rate is split between three meters The third tank returns to standby as demand decreases and returns below the second trip point.
  • Page 60 Installer manual Fleck 2850 NXT/NXT2 - Installation Inlet Outlet Valve Check valve Tank 4th in 3rd in 2nd in 1st in standby standby standby standby (Primary Meter valve) 5.8.7.2 System operation in regeneration The primary tank regenerates when its remaining volume becomes zero. The next tank with the least remaining volume becomes the new primary tank.

  • Page 61: Electrical Connections

    Installer manual Fleck 2850 NXT/NXT2 - Installation Electrical connections CMN: Common Solenoid valve Flow meter Sw1: Valve homing switch GND: Ground Sw2: Valve step switch HCAM: Valve homing cam Sw3: Lower drive switch (only for 2910 and 3900 valves) LCK:...

  • Page 62: Nxt Controller Connections

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.9.1 NXT controller connections 62 / 174 Ref. MKT-IM-031 / D - 16.01.2023...

  • Page 63: Nxt2 Controller Connections

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.9.2 NXT2 controller connections Caution - material Risk of non-function due to wrong connection ! Do not connect 24V (AC or DC) power supply on the Lower piston switch connector P17. OPTIONAL OPTIONAL REMOTE...

  • Page 64: Nxt Controller Connections For Multiple Valves

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.9.3 NXT controller connections for multiple valves 2 controllers NXT Duplex system 5, 6, 7, 9 & 14 3 controllers NXT Triplex system 5, 6, 9 & 14 4 controllers NXT Quadriplex system 5, 6, 9 & 14...

  • Page 65: Nxt2 Controller Connections For Multiple Valves

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.9.4 NXT2 controller connections for multiple valves Mandatory Use CAT5 (with RJ45 connector) or better twisted pair cables with a maximum length of 30 meters ! 2 controllers NXT2 Duplex system 5, 6, 7, 8, 9 & 14 3 controllers NXT2 Triplex system 5, 6, 9 &...

  • Page 66: Bypassing

    Installer manual Fleck 2850 NXT/NXT2 - Installation 5.10 Bypassing A bypass valve system should be installed on all water conditioning systems. Bypass valves isolate the softener from the water system and allow unconditioned water to be used. Service or routine maintenance procedures may also require that the system is bypassed.

  • Page 67: Overflow Line Connection

    Installer manual Fleck 2850 NXT/NXT2 - Installation Secure the end of the drain line to prevent it from moving. Mandatory Waste connections or the drain outlet shall be designed and constructed to provide connection to the sanitary waste system through an air-gap of 2 pipe diameters or 50.8 mm (2"), whichever is larger.

  • Page 68: Brine Line Connection

    Installer manual Fleck 2850 NXT/NXT2 - Installation Overflow fitting Drain tubing Secure hose in place Air gap Drain Caution - material Risk of flooding due to lack of floor drain ! Floor drain is always recommended to avoid flooding in case of overflow.

  • Page 69: Programming

    Installer manual Fleck 2850 NXT/NXT2 - Programming Programming NXT controller 6.1.1 Display 1. System type • 4: single valve; • 5:Multiple valves, parallel interlock system, 2 to 4 valves; • 6: Multiple valves, parallel series regeneration system, 2 to 4 valves; • 7: duplex alternating immediate system, 2 valves;...

  • Page 70: Commands

    Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.2 Commands Info At any time, press D to return to the home screen without saving. Menus are displayed in a defined and incremental order. If none of the buttons are pushed for 5 minutes in the Programming mode, or if there is a power failure, the controller returns to Service mode without saving.
  • Page 71 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note FEED WATER 1 to 1’999 Milligram CaCO This screen will only display on the HARDNESS lead unit for system type 6. For all other system types, it will display for all units.

  • Page 72: Master Programming Mode

    Installer manual Fleck 2850 NXT/NXT2 - Programming Mandatory For a timeclock valve, this value must be set ! Info For metered valves, calendar override parameter would trigger a regeneration only if the volumetric control did not start a regeneration before calendar override period elapsed.
  • Page 73 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.5.1 Master programming mode chart Parameter Options Definition Note LANGUAGE ENGLISH English (default) FRANCAIS French DEUTSCH German ITALIANO Italian ESPANOL Spanish SYSTEM TYPE Single unit (default) 1 unit. Parallel interlock 2 to 4 units. Parallel series...
  • Page 74 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note REMOTE SIGNAL OFF to 99 OFF (default) This screen will not be displayed for START minutes system type 14. This screen will only display on the lead (#1) unit for system types 6 & 7.
  • Page 75 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note REGENERATION 00:00:00 Hour Regeneration time will not appear TIME to 23:59:59 02:00 AM (default) unless regeneration day override is on or vale is programmed as time clock or meter delayed.
  • Page 76 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note CPO AUX RELAY 1 to 9’999 Only displayed if chemical pump is VOLUME enabled in previous screen. Activate the relay output during a CPO AUX RELAY 00:00:00 Hour service based upon the volume of TIME to 02:00:00...
  • Page 77 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.5.4 System type Select the system in which the valve(s) operate(s). Options: • 4 (default): single valve; • 5: multiple valves, parallel interlock system; • 6: multiple valves, parallel series regeneration system; • 7: duplex alternating immediate system;...
  • Page 78 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.5.6 System size Set the number of valves to be connected (2 to 4 valves) in the system. Info Only visible in multiple valve systems and only present on the master #1 valve. Options: •...
  • Page 79 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Set valve type at 2850 with 2. Press to validate the selection and advance to the next parameter. 6.1.5.9 Regenerant flow Set the direction of flow during the brine draw cycle. Info The availability depends on the valve type programmed in the previous step.
  • Page 80 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.5.11 Display format Set the system unit to be used. Options: • US GALLONS (default): volume in gallons, time display 2 x 12 hours, hardness in grains; • EU-METRIC-LITRES: volume in litre, time display 24 hours and hardness depends on the...
  • Page 81 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.5.14 Feed water hardness Info Only displayed if valve is programmed as volumetric. This screen will only display on the lead (#1) unit for system type 6. For all other system type, it will display for all units.
  • Page 82 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Set the trip point 2 flow rate with ð Can be adjusted from trip point 1+1 to 3998 l/min. 2. Press to validate the selection and advance to the next parameter. 3. Set the trip point 2 delay with ð...
  • Page 83 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Adjust the number of days with Without calendar forcing. 2. Press to validate the selection and advance to the next parameter. ð Can be adjusted from: Forcing every 3 days. 1 to 99 days for timeclock regeneration;...
  • Page 84 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Adjust the cycle time with 1. Backwash: 10 min (default). 2. Press to validate the selection and advance to the next parameter. 3. Repeat for each cycle. 2. Draw/Slow rinse: 1 h 00 min (default). 3. Fast rinse: 10 min (default).
  • Page 85 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Activate the relay with Disabled. 2. Press to validate the selection and advance to the next parameter. 3. Set the relay activation time with Relay enabled at the beginning of regeneration. 4. Press to validate the selection and advance to the next parameter.
  • Page 86 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Activate the relay with Disabled. 2. Press to validate the selection and advance to the next parameter. 3. Set the relay activating volume with Relay enabled every 20 litre. 4. Press to validate the selection and advance to the next parameter.

  • Page 87: Diagnostic

    Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Set the maximum flow rate with Example: 290 L/min. 2. Press to validate the selection and advance to the next parameter. 3. Set the number of litres per pulse(s) with Example: 1 litre for 1 pulse.
  • Page 88 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.6.3 Peak flow rate Info The controller registers the highest flow rate since the last regeneration. 6.1.6.4 Totalizer Info The controller registers the total volume of treated water that passes through the meter since start-up (or last hard reset).
  • Page 89 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.6.7 Volume remaining Info Shows the volume remaining for the valve where controller is installed, excepted for system 6 where it shows the volume remaining of the complete system. This parameter is adjustable, allowing adjustment of the volume remaining after any servicing of the system.

  • Page 90: Resetting The Controller

    Installer manual Fleck 2850 NXT/NXT2 - Programming 6.1.7 Resetting the controller Mandatory Once you have completed this operation, check all programming steps ! Info There are two options to reset: partial and hard reset. Partial reset will set all the parameters to default values, except flow meter totalizer volume in diagnostic mode.

  • Page 91: Nxt2 Controller

    Installer manual Fleck 2850 NXT/NXT2 - Programming NXT2 Controller Info All information of this chapter correspond to software version 1.0.1387. 6.2.1 Display 1. System type • 4: Single valve; • 5: Multiple valves, parallel interlock system, 2 to 8 valves; • 6: Multiple valves, parallel series regeneration system, 2 to 8 valves;...
  • Page 92 Installer manual Fleck 2850 NXT/NXT2 - Programming 3. Valve status • Initializing: after a power failure or a change in the programming, the controllers initializes for approximately 30 seconds; • Lock windows: the controller is inside the lockout windows; • Lock remote: the controller is acquiring the lockout remote signal;...

  • Page 93: Commands

    Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.2 Commands 6.2.2.1 Menu commands Info At all menus, press to return to previous screen without saving. Menus are displayed in a defined and incremental order. Editable digit is marked by two triangles (Cursor).

  • Page 94: Time Of Day Menu

    Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.3 Time of day menu Mandatory In multiple valve systems, set the time of day on the lead valve (#1) ! The time of day will be automatically updated on the other valves in the system within 10 seconds.

  • Page 95: Basic Programming Mode

    Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.4 Basic programming mode 6.2.4.1 Basic programming mode chart Parameter Options Definition Note DAY OVERRIDE / OFF to 99 This screen will not be displayed if day TIME DRIVEN of week regeneration has been selected.
  • Page 96 Installer manual Fleck 2850 NXT/NXT2 - Programming Info For metered valves, day override parameter would trigger a regeneration, only if the volumetric control did not start a regeneration before calendar override period elapsed. Each volumetric regeneration happening reset the calendar override delay.

  • Page 97: Master Programming Mode

    Installer manual Fleck 2850 NXT/NXT2 - Programming Info This parameter is visible only in meter immediate/delayed mode 1. Adjust the volume with and . 2. Press to validate the selection and advance to the next parameter. 6.2.4.6 Push settings This parameter allows to push and copy settings from the one unit to all other connected units.
  • Page 98 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note ASSISTANCE 12 characters maximum. NAME 1 ASSISTANCE NAME 2 ASSISTANCE 14 characters maximum. PHONE SYSTEM Single unit (default) 1 unit. Parallel interlock 2 to 8 units. Parallel series regeneration Alternating immediate 2 units. Alternating delayed Parallel with standby 2 to 8 units.
  • Page 99 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note REGEN. FLOW DOWN FLOW Down flow softener (default) UP FLOW Up flow softener Do not use for 2510, 2750 and 2850 valve types. FILTER Filter REGEN. TYPE TIME CLOCK Time clock System 4 and 6 only.
  • Page 100 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note RESERVE WEEKLY (default) This screen will only display when RESERVE regeneration type selected is softener meter delayed. VARIABLE RESERVE FIXED% FIXED VOLUME FIXED% 0 to 50 This screen will only display when...
  • Page 101 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note DAY OVERRIDE / OFF to 99 This screen will not be displayed if TIME DRIVEN day of week regeneration has been selected. Days between regenerations only for metered regeneration types.
  • Page 102 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note METER TYPE GENERIC Default flow meter type is based on the valve type; 0.75" PADDLE (default for 2510) This screen will only display when 0.75" TURBINE regeneration type selected is 1.0"...
  • Page 103 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note AUX. 1: CYCLE Service position Only displayed if “Cycle based” is BASED chosen for auxiliary 1; Backwash position Activate or de-activate for each Draw and slow rinse position (  = deactivated; position  = activated).
  • Page 104 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note AUXILIARY 2 STANDBY Activates relay from beginning of regeneration and during standby phase. (default) ALARM BASED Any alarm or error detected by the controller will start signal output from Auxiliary relay#2.
  • Page 105 Installer manual Fleck 2850 NXT/NXT2 - Programming Parameter Options Definition Note AUX. 2: VOLUME 0 to MAX Litre Only displayed if “volume based” is BASED – chosen for auxiliary 1; VOLUME - L Volume range depend on capacity; Even if maximum theoretical programmable value is 999999 the controller will take the unit capacity as maximum volume.
  • Page 106 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.5.4 Language Select the displayed language. Options: • English (default); • French; • German; • Italian; • Spanish; • Dutch; • Portuguese. 1. Select the language with 2. Press to validate the selection and advance to the next parameter.
  • Page 107 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Edit assistance phone using and ; ð Each character can be chose from 0 to 9 or stay empty; 2. Press to validate the selection and advance to the next parameter. 6.2.5.7 System type Select the system in which the valve(s) operate(s).
  • Page 108 Installer manual Fleck 2850 NXT/NXT2 - Programming Info Only visible in system 14, and on master valve, identified by on the controller screen. Depending on the number of tanks used in the system, there might up to 7 trip point to set up (for 8 tanks systems).
  • Page 109 Installer manual Fleck 2850 NXT/NXT2 - Programming • down flow (default); • up flow (do not use for 2510, 2750 and 2850 valve types); • filter. 1. Select regeneration flow with 2. Press to validate the selection and advance to the next parameter.
  • Page 110 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.5.14 Volume override/ Volumetric Set the volume of water between 2 cleaning cycles. Info Available only for filter metered systems. 1. Set the volume override with and ; ð Can be adjusted from 0 to 9.999.999 litres;...
  • Page 111 Installer manual Fleck 2850 NXT/NXT2 - Programming Info This screen is displayed only for metered systems. Based upon the system capacity, reserve and inlet water hardness, the controller calculates the volume of water that the system can treat between 2 regenerations.
  • Page 112 Installer manual Fleck 2850 NXT/NXT2 - Programming Options: • weekly reserve (default); • variable reserve; • fixed%; • fixed volume. 1. Select reserve type with 2. Press to validate the selection and advance to the next parameter. Fixed% Set the percentage of the total system capacity used to calculate the safety reserve capacity.
  • Page 113 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.5.19 Remote regeneration Select the regeneration type for remotely started regeneration (external dry contact input, see chapter NXT2 controller connections [ → Page 63]). Info This mode can be combined with the other methods of regeneration The remotely started regenerations overrule the other regeneration type once the signal is acquired.
  • Page 114 Installer manual Fleck 2850 NXT/NXT2 - Programming • Tuesday; • Wednesday; • Thursday; • Friday; • Saturday. 1. Select the days for regeneration with and ; ð Multi-selection is possible; ð Not selected days are marked by and selected days are marked by 2.
  • Page 115 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Adjust the time of regeneration with 2. Can be adjusted from: 00:00 to 23:59HR; 3. Press to validate the selection and advance to the next parameter. 6.2.5.24 Lock window Set Lock Window: Enable lock windows then select the desired Lock Start time and Lock End time.
  • Page 116 Installer manual Fleck 2850 NXT/NXT2 - Programming Info Lock Window #2 settings are accessible only if lock windows #1 is on. 1. Enable lock window with Lock window #2 activated. 2. Press to validate the selection and advance to the next parameter. 3. Set lock start time with Lock window #2 starts at...
  • Page 117 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Adjust the cycle time with 1. Backwash: 10 min (default). ð Can be adjusted from: 0 to 240 minutes; 2. Press to validate the selection and advance to the next parameter; 2. Draw: 60 min (default).
  • Page 118 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Select the meter type with 2. Press to validate the selection and advance to the next parameter. Generic meter Set the generic meter settings. Info Only visible if "generic" was selected as meter type in the previous step.
  • Page 119 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Set continuous flow on with Continuous flow detect activated. 2. Press to validate the selection and advance to the next parameter; 3. Adjust flow rate with and ; Continuous flow detect - 4.
  • Page 120 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Choose the options of relay with Activated during selected cycle step. ð Unselected cycle are marked by ð Activated cycles are marked with a ð Multi-selection is possible; 2. Press to validate the selection and advance to the next parameter.
  • Page 121 Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Set the relay Start time #2 with Activated 12 minutes after the regeneration started. 2. Can be adjusted from: end time #1 +1 to the total regeneration duration minus 1 minute; TIME BASED - START TIME #2.
  • Page 122 Installer manual Fleck 2850 NXT/NXT2 - Programming Info Available only for multi-valves systems. The ability to transmit settings from one unit to all other connected units. After push settings are complete, you may still make unique changes to individual units.

  • Page 123: Diagnostic

    Installer manual Fleck 2850 NXT/NXT2 - Programming 1. Select the lock setting option with 2. Press to validate the selection. 6.2.5.32 Parameters saving Info When the last parameter is set and the button pressed (after lock settings), the controller updates the database based on the new programming.
  • Page 124 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.6.4 Totalizer Info The controller registers the total volume of treated water that passes through the meter since start-up (or last hard reset). 1. To reset, press and hold the buttons for 5 seconds until the display shows zero.
  • Page 125 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.6.9 Software version Info Shows the version of the software loaded in the controller. Mandatory In case of use of multiple valves system, verify the controller’s software compatibility ! 6.2.6.10 Number of regeneration Info Shows number of regeneration since installation.
  • Page 126 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.6.14 Sunday average daily usage Info Shows average water consumption on Sunday. 6.2.6.15 Sunday- daily usage Info Shows water consumption for the last 20 Sunday. 6.2.6.16 Monday average daily usage Info Shows average water consumption on Monday.
  • Page 127 Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.6.19 Tuesday- daily usage Info Shows water consumption for the last 20 Tuesday. 6.2.6.20 Wednesday average daily usage Info Shows average water consumption on Wednesday. 6.2.6.21 Wednesday- daily usage Info Shows water consumption for the last 20 Wednesday.

  • Page 128: Resetting The Controller

    Installer manual Fleck 2850 NXT/NXT2 - Programming 6.2.6.24 Friday average daily usage Info Shows average water consumption on Friday. 6.2.6.25 Friday- daily usage Info Shows water consumption for the last 20 Friday. 6.2.6.26 Saturday average daily usage Info Shows average water consumption on Saturday.
  • Page 129 Installer manual Fleck 2850 NXT/NXT2 - Programming Info There are two options to reset: reset to factory defaults or reset to Non-Factory Defaults. Reset to factory defaults will set all the parameters to factory default values. Reset to non-factory defaults will set all the parameters to previously saved default values.

  • Page 130: Commissioning

    Installer manual Fleck 2850 NXT/NXT2 - Commissioning Commissioning Info This chapter is available for standard regeneration flows. Contact your supplier if the actual regeneration is not standard and if you need assistance. Water filling, draining and waterproofness inspection 7.1.1 Activating a single valve system (System 4) 1.

  • Page 131: Activating A Multiple Valves System (Systems 5, 6, 7, 8, 9 And 14)

    Installer manual Fleck 2850 NXT/NXT2 - Commissioning 12. With the brine tank completely refilled and full of salt, adjust the safety brine valve in the brine well. Make sure the overflow elbow is installed above the float level and the discharge point.

  • Page 132: Sodium Or Calcium Hypochlorite

    Installer manual Fleck 2850 NXT/NXT2 - Commissioning Depending on the conditions of use, the softener type, the type of ion exchanger and the disinfectant available, a choice can be made among the following methods. 7.2.2 Sodium or calcium hypochlorite These materials are satisfactory for use with polystyrene resins, synthetic gel zeolite, greensand and bentonites.

  • Page 133: Operation

    Installer manual Fleck 2850 NXT/NXT2 - Operation Operation Display 8.1.1 NXT controller 8.1.1.1 During service • Single valve in service in timeclock mode: • single valve in service in volume immediate or delayed mode: • lead valve in regeneration queued in interlock system: •...
  • Page 134 Installer manual Fleck 2850 NXT/NXT2 - Operation • single valve in service in volume immediate or delayed mode: • lead valve in regeneration queued in interlock system: • window lock activated in serial regeneration system: • remote lock activated in serial regeneration system: 8.1.2.2...

  • Page 135: Led Status

    Installer manual Fleck 2850 NXT/NXT2 - Operation • cycle step #4, time remaining 2 hours 40 min: Once in position: • the timer advance to regeneration cycle step #5: During transition to cycle: • cycle step #5, time remaining 15 min: Once in position: 8.1.3 LED status Blue the unit is in service and no errors detected;...

  • Page 136: Immediate Regeneration

    Installer manual Fleck 2850 NXT/NXT2 - Operation ð For NXT2: The blue LED and the symbol on the valve state flash. Info To cancel: press (for NXT) or (for NXT2) again. For NXT: The blue LED stop flashing and the letters SRV take place on the valve status.

  • Page 137: Maintenance

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance Maintenance Mandatory Cleaning, maintenance and service operation shall take place at regular intervals and must be done by qualified personnel only in order to guarantee the proper functioning of the complete system. Report maintenance done in the Maintenance chapter of the User Guide document.

  • Page 138: Regeneration Test

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.1.3 Regeneration test 9.1.3.1 Valve used for softening 1. Check condition of brine tank and any associated equipment. 2. Check salt level in brine tank. 3. Initiate regeneration test. ð Check brine draw during brine draw stage.

  • Page 139: Recommended Maintenance Plan

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance Recommended maintenance plan 9.2.1 Valve used for softening Items 1 year 2 year 3 year 4 year 5 year Injector & filter Clean Clean Clean Clean Clean/ replace if necessary BLFC*** Clean Clean...
  • Page 140 Installer manual Fleck 2850 NXT/NXT2 - Maintenance Items 1 year 2 year 3 year 4 year 5 year Valve Check Check Check Check Check watertightness Valve to piping Check Check Check Check Check watertightness * Wear parts - durability strongly affected by raw water quality and regeneration frequency.

  • Page 141: Valve Used For Filtration

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.2.2 Valve used for filtration Items 1 year 2 year 3 year 4 year 5 year DLFC*** Clean Clean Clean Clean Clean/ replace if necessary Bypass (if Clean Clean Clean Clean Clean/replace present,...

  • Page 142: Recommendations

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance Recommendations 9.3.1 Use original spare parts Caution - material Risk of damage due to use of non-genuine spare parts ! To ensure correct operation and safety of the device, only use original spare parts and accessories recommended by the manufacturer.

  • Page 143: Power Head And/Or Motor Replacement

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.2 Power head and/or motor replacement 9.4.2.1 Valve with NXT controller Info As the DC motor is equipped with an AC to DC converter, AC and DC motors can be used with the NXT controller.
  • Page 144 Installer manual Fleck 2850 NXT/NXT2 - Maintenance AC motor DC motor 144 / 174 Ref. MKT-IM-031 / D - 16.01.2023...
  • Page 145 Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.2.2 Valve with NXT2 controller Caution - material Risk of damage due to AC motor use ! Use only DC motor with NXT2 controller. 1. Using a flat screwdriver, unscrew (1) and open the cover (2).

  • Page 146: Nxt To Nxt2 Controller Upgrade

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.3 NXT to NXT2 controller upgrade Mandatory As NXT2 controller functions only with DC motors, in case of NXT to NXT2 controller upgrade, the AC motor must be changed for a DC motor ! 1.
  • Page 147 Installer manual Fleck 2850 NXT/NXT2 - Maintenance Ref. MKT-IM-031 / D - 16.01.2023 147 / 174...

  • Page 148: Nxt2 Controller Replacement

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.4 NXT2 controller replacement 1. Using a flat screwdriver, unscrew (1) and open the cover (2). 2. Press on the clips (3) and remove the controller (4). 3. Disconnect the controller (4). 4. Connect the new NXT2 controller (5), see NXT2 controller connections [ Page 63].

  • Page 149: Piston And/Or Seal And Spacer Kit Replacement

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.5 Piston and/or seal and spacer kit replacement 1. Remove the power head, see Power head and/or motor replacement [ Page 143]. → 2. Using pliers, remove the piston (4). Caution - material Risk of damage on piston due to wrench use ! Usind a wrench on piston rod coating will cause leakages.
  • Page 150 Installer manual Fleck 2850 NXT/NXT2 - Maintenance 150 / 174 Ref. MKT-IM-031 / D - 16.01.2023...

  • Page 151: Micro-Switches Replacement

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.6 Micro-switches replacement Info This procedure is valid for AC and DC motor assemblies. 1. Using a flat screwdriver, unscrew (2) and open the cover (1). 2. Open the controller (3). 3. Disconnect the microswitches (4).

  • Page 152: Cams Replacement

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.7 Cams replacement Info This procedure is valid for AC and DC motor assemblies. 1. Remove the micro-switches, see Micro-switches replacement [ → Page 151]. 2. Using pliers, remove the circlip (1) and free the arm (2).

  • Page 153: Injector Cleaning

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.8 Injector cleaning 1. Using a 16 mm wrench, unscrew the nut (3) to release the tube (4). 2. Using a 8 mm wrench, unscrew (1) and remove the injector assembly (2). 3. Using flat screwdrivers, remove the injector nozzle (7) and the injector throat (8) from the injector body (10).

  • Page 154: Blfc Cleaning

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.9 BLFC cleaning 1. Using a 16 mm wrench, unscrew the nuts (2) and remove the tube (1). 2. Using an 18 mm wrench, remove the BLFC holder (3). 3. Using pliers, remove the cage (4) from the BLFC holder (3).

  • Page 155: Dlfc Cleaning

    Installer manual Fleck 2850 NXT/NXT2 - Maintenance 9.4.10 DLFC cleaning 1. Using a 38 mm wrench, remove the DLFC holder (2). 2. Using a flat screwdriver, remove the DLFC washer (1) from DLFC holder (2). 3. Clean or change the DLFC washer (1).

  • Page 156: Troubleshooting

    Installer manual Fleck 2850 NXT/NXT2 - Troubleshooting Troubleshooting 10.1 Error detection Info It can take up to 30 seconds before an error can be detected and displayed. Mandatory All the errors must be displayed on each controller before they can be corrected ! •...
  • Page 157 Installer manual Fleck 2850 NXT/NXT2 - Troubleshooting Problem Cause Solution Hard water By-pass valve is open. Close by-pass valve. No salt is in brine tank. Add salt to brine tank and maintain salt level above water level. Injector screen plugged.

  • Page 158: Programming Error

    Installer manual Fleck 2850 NXT/NXT2 - Troubleshooting Problem Cause Solution Excessive water in brine Plugged drain line flow control. Clean flow control. tank Plugged injector system. Clean injector and screen. Controller is not cycling. Replace controller. Foreign material in brine valve.

  • Page 159: Examples Of Error Displayed

    Installer manual Fleck 2850 NXT/NXT2 - Troubleshooting • system size: ex. programmed for 4 units, but there are only 2 units; • units of measure do not correspond between the different valves of the system; • wrong type of valve programmed.
  • Page 160 Installer manual Fleck 2850 NXT/NXT2 - Troubleshooting • the motor is on but no encoder pulses are detected or CAM Switches change state within a given duration; – Verify microswitch wiring and that microswitches are working properly. • motor current exceeds thresholds;...

  • Page 161: Spare Parts And Options

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options Spare parts and options 11.1 Valve parts list Item Part number Description Packaging quantity Brine valve (see Brine valve parts list [ → Page 165]) 25171-1.2 DLFC 1” NPT - ¾” BSP Assy 1.2 gpm 2850/2910/9500 25171-1.5...
  • Page 162 Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options Item Part number Description Packaging quantity 25171-7 DLFC 1” NPT - ¾” BSP Assy 7 gpm 2850/2910/9500 25581-8 DLFC 1in NPT - 3/4in BSP assy 8 gpm 2850/2910/9500 25581-9 DLFC 1in NPT - 3/4in BSP assy 9 gpm 2850/2910/9500 25581-10 DLFC 1in NPT - 3/4in BSP assy 10 gpm 2850/2910/9500...

  • Page 163: Power Head Parts List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options 11.2 Power head parts list Item Part number Description Packaging quantity 26260 Transformer 24 VAC, 60 VA 11545 Power cord European black BU28713 Timer assy NXT BR61702-03 Circuit board NXT 29195 Front panel assy NXT2...

  • Page 164: Injector Parts List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options Item Part number Description Packaging quantity 19791-01SP Turbine Meter Cable 0.450 m 19121-01SP Electronic Meter Cable 0.47 m 28704SP Plug 28008 Harness pulse timer 3230 shown 40400 Harness motor ex 11667...

  • Page 165: 1700/1710 Injector Parts List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options 11.3.2 1700/1710 injector parts list Item Part number Description Packaging quantity 29251 Inj assy 1700/1710 #6C (#7C) 2850/2910 29250 Injector assy 1700/1710 #6C (#7C) 2850/2910 29184 Injector service kit 1710 9500/2750/2850/2910 DF 29221 Kit elbow fitting male 1.2T x 3/8NPT...
  • Page 166 Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options Item Part number Description Packaging quantity BU28797-0.25 BV 1650 assy 2750NBP/2850/2910 0.25 gpm BU28797-0.50 BV 1650 assy 2750NBP/2850/2910 0.50 gpm BU28797-1 BV 1650 assy 2750NBP/2850/2910 1 gpm 26909-0.25 BV 1600 assy 2750NBP/2850 0.25 gpm 26909-0.50...

  • Page 167: Safety Brine Valves List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options Item Part number Description Packaging quantity 24181-2 Kit BV 1700 assy 2.00 gpm 24181-4 Kit BV 1700 assy 4.00 gpm 24181-7 Kit BV 1700 assy 7.00 gpm 28423-1.2 BV 1710 1.2 gpm except 9500...

  • Page 168: Safety Brine Valves 2310 Parts List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options 11.6 Safety brine valves 2310 parts list Item Part number Description Packaging quantity 60014SP Body Assy SBV 2310 18312SP Retainer, drain 19805SP Nut SBV 2310 Plastic 60068-30SP New Float assy 2310...

  • Page 169: Distribution Systems Parts List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options 11.7 Distribution systems parts list Item Part number Description Packaging quantity 18404 2" distributor assy, 1m82 18396 2" bottom distributor BU28649 2" tube, 1m66 (ACS) 21148HW 2" tube HW, 1m66 26050 2"...

  • Page 170: Meters Parts List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options Item Brine Part Description Packaging system number quantity 1710 18979 Air checks 900, 1m88 BU28510 Air checks 900, 1m10 18980 Air check 900 HW 11.9 Meters parts list Item Part number...

  • Page 171: Additional Parts List

    Installer manual Fleck 2850 NXT/NXT2 - Spare parts and options 11.11 Additional parts list Item Part number Description Packaging quantity Kit 8 Top distributor 2” & pin assy Kit 9 Top distributor 2” & pin assy HW 11.12 Other components list...

  • Page 172: Disposal

    This will help to reduce the impact on the environment, health, safety and help to promote recycling. Pentair does not collect used product for recycling. Contact your local recycling center for more information.
  • Page 173 Installer manual Fleck 2850 NXT/NXT2 Notes Ref. MKT-IM-031 / D - 16.01.2023 173 / 174...
  • Page 174 WWW.PENTAIR.EU All indicated Pentair trademarks and logos are property of Pentair. Third party registered and unregistered trademarks and logos are the property of their respective owners. © 2023 Pentair. All rights reserved.

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