Summary of Contents for Nelsen Corporation NRO 440
- Page 1 Nelsen NRO 440 Installation, Operation & Maintenance Manual Commercial Systems Systems manufactured after May-2017 Including Models NRO-1440-1600 NRO-2440-3200 NRO-3440-4800 NRO-4440-6400 NRO-5440-8000 NRO-6440-10000...
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Page 2: Table Of Contents
Table of Contents System Specifications Page 1 ..................................................................Introduction Page 2 ............................................................................Feed Water Requirements Page 3 ................................................................. RO Membranes Page 4 ........................................................................Recovery & Rejection Page 5 ..................................................................... System Requirements & Operation Guidelines Page 5 ..............................................RO Start-Up Page 6 - 8 ............................................................................ -
Page 3: System Specifications
System Specifications Nelsen Commercial Reverse Osmosis System Specifications Model: NRO-1440 NRO-2440 NRO-3440 NRO-4440 NRO-5440 NRO-6440 Production GPD 1600 3200 4800 6400 8000 10,000 Membrane 4 X 40 (1) 4 X 40 (2) 4 X 40 (3) 4 X 40 (4) 4 X 40 (5) 4 X 40 (6) Permeate GPM... -
Page 4: Introduction
Introduction Nelsen Corporation’s commercial reverse osmosis to pass through to Point of Use (POU). Reverse NRO systems produce high quality water. The osmosis is considered to be the finest filtration system is durable and with proper care will last process and was developed as a method for the for many years. -
Page 5: Feed Water Requirements
Feed Water Requirements Feed water quality has a huge effect on the hardness scaling. Softening is the preferred method performance of the reverse osmosis system. It is of controlling hardness scale. important to supply the reverse osmosis system with Carbon Filter - Used to remove chlorine and the feed water quality shown below. -
Page 6: Membranes
Reverse Osmosis Components • Reverse Osmosis Unit: Required for the production Table 3: Typical Rejection Characteristics of treated water, as per the daily requirements. of Reverse Osmosis Membranes Different capacities of the unit are available Sodium 85-94% depending on the rate of production of purified Lead 95-98% water. -
Page 7: Recovery & Rejection
× 100 = 98.7% 1500 Feed Flow = 10 + 15 = 25 GPM % Recovery = (10/25) x 100 = 40% Nelsen Corporation Electrical Do not apply power to the RO unit at this time recommends that a licensed electrician The pump used on the NRO system is a pump &... -
Page 8: Ro Start-Up
RO Start-Up Prior to installation of the RO system, flush the feed • Membrane installation - some RO's do not have lines and pretreatment equipment first (especially membranes installed, if this is the case refer to the media filters) without allowing the feed water to page 10, Membrane Removal &... - Page 9 RO Start-Up • Locate the permeate outlet on the backside of the If the NRO system is equipped with an NRO permeate flow meter and remove the dust cap, Controller, the level control is connected to the level water/preservative may flow out of flow meter control connections in box.
- Page 10 • Flush the system for 30 minutes to remove the GPM prior to adjustment, slowly open the Recycle preservative from the membranes while inspecting Valve until the Concentrate Flow Meter reads the system for leaks approximately 7.55 GPM (11.0 – 3.45 = 7.55) •...
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Page 11: Operation & Maintenance
Operation & Maintenance Check your feed water chemistry. Pre-treatment and/ Prefilter Pressure Gauges or reducing the system recovery may be required to These gauges measure feed water pressure when reduce fouling and scaling on membranes. it enters and exits the prefilter housing. A pressure RO process causes concentration of impurities in differential of 10% or more indicates the prefilter the concentrate stream to increase. - Page 12 • Thread a nipple and tee into the concentrate • Reattach any fittings that may have been port. The nipple must extend past the end of the disconnected in the process. pressure vessel. Apply slight force to remove end New or factory •...
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Page 13: Membrane Cleaning
Membrane Cleaning Periodic cleaning of membranes can improve system • Solution of 1.0% sodium triphosphate (STP), 1.0% performance. In normal conditions, mineral scale, trisodium phosphate (TSP) and 1.0% Na-EDTA biological matter, colloidal particles and organic The pH of the solutions above should be Cleaning chemicals are substances can foul membranes. -
Page 14: Spare Parts
The prefilter cartridge should be replaced before AND after the cleaning is disinfection procedures. 7. Turn the system on and flush at 50 psi (3.5 bar) NOTE: for 15 minutes. Discard all of the permeate and concentrate water. 1. Remove deposits on membranes and other 8. -
Page 15: Troubleshooting
Nelsen Commercial NRO 440 Series Systems Troubleshooting SYMPTOMS POSSIBLE CAUSES CORRECTIVE ACTION Low supply pressure <35 psi Increase inlet flow pressure to >35psi Cartridge filter plugged Change filters Solenoid valve malfunction Replace solenoid valve and/or coil Leaks Fix any visible leaks... - Page 16 Nelsen Commercial NRO 440 Series Systems Troubleshooting SYMPTOMS POSSIBLE CAUSES CORRECTIVE ACTION Shock dosage of Sodium Bi-Sulfate. Continuous feed of Sodium Bi-sulfate at reduced pH. Biological Fouling Chlorination and De-chlorination. Replace cartridge filters. Activated Carbon or other pretreatment. Membrane Fouling Organic Fouling Clean w/high pH cleaner.
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Page 17: Operation Log
OPERATION LOG Model Number: Start-Up Date Week of: Last Cleaning Date Date Time Hours Of Operation Inlet Pressure Post Pre-Filter Pressure Pressure Differential Permeate Pressure Feed Pressure First Array Feed Pressure Differential Pressure Permeate Flow Concentrate Flow Percent Recovery Feed Flow Feed Conductivity Permeate Conductivity Percent Rejection... - Page 18 OPERATION LOG Model Number: Start-Up Date Week of: Last Cleaning Date Date Time Hours Of Operation Inlet Pressure Post Pre-Filter Pressure Pressure Differential Permeate Pressure Feed Pressure First Array Feed Pressure Differential Pressure Permeate Flow Concentrate Flow Percent Recovery Feed Flow Feed Conductivity Permeate Conductivity Percent Rejection...
- Page 19 NRO COMMERCIAL REVERSE OSMOSIS SYSTEM LIMITED WARRANTY Nelsen Corporation (“Nelsen”) provides this limited warranty as described below (the “Limited Warranty”). Limited Warranty Subject to the terms of this Limited Warranty, Nelsen warrants to the original buyer (“Buyer”) of this Water Conditioner product (the “Product”) solely from a Nelsen authorized dealer that the Product will be free from defects in material or...
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Page 20: Warranty
Limited Warranty or the Product, including, but not limited to, any and all claims for breach of warranty or products liability, and Nelsen and Buyer expressly waive any objection to the jurisdiction and/or venue of such courts. © Nelsen Corporation Part # NRO-440-MAN — rev 0121...