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North Star NSRO42C4 - User Manual

North Star NSRO42C4
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7313242 (Rev. M 7/1/13)
NSRO42C4
Manufactured and warranted by
Ecodyne Water Systems LLC
1890 Woodlane Drive
Woodbury, MN 55125
Installation and Operation Manual
System tested and certified by NSF International
against NSF/ANSI Standards 42 & 58.
See performance data sheet for details.
If you have any questions or concerns when
installing, operating or maintaining your reverse
osmosis system, call our toll free number:
1-800-972-0135
Monday- Friday, 7 AM - 6 PM CST
(in Canada please call
1-800-796-6784)
or visit www.northstarconditioning.com
When you call, please be prepared to provide
the model, date code and serial number of your
product, found on the rating decal, located
inside the cover.
How to Install, operate and
maintain your Reverse Osmosis
Drinking Water System
Designed, Engineered &
Assembled in the U.S.A.

Table of Contents

Questions and Answers

  • K
    Kim NobleSep 9, 2025
    Why is my North Star Water System making product water too slowly?
    • A
      Alexander HatfieldSep 9, 2025
      If your North Star Water System is producing water too slowly, it could be due to a couple of reasons. First, the water supply to the system might not be within the required specifications. You may need to increase water pressure or precondition the water. Second, the prefilter or Reverse Osmosis membrane cartridges might be clogged with sediment. Try replacing the prefilter cartridge. If the rate doesn't improve, replace the postfilter cartridge and Reverse Osmosis membrane cartridge.
  • H
    htrevinoAug 23, 2025
    Why does my North Star Water Filtration System water have a strange taste or odor?
    • S
      Shawn PierceAug 23, 2025
      If your North Star Water Filtration System water has an unusual taste or odor, several factors could be responsible. The postfilter might be expended, so try replacing the postfilter cartridge. If the issue persists, replace the prefilter cartridge and the Reverse Osmosis membrane cartridge. Another possibility is contamination in the product water storage tank; in this case, use sanitizing procedures and replace the prefilter and postfilter cartridges. The entire system may be contaminated, so sanitize the entire system.
  • M
    Marcus HuberAug 25, 2025
    What to do if my North Star NSRO42C4 faucet airgap is leaking?
    • L
      Lori SmithAug 25, 2025
      If water is leaking from the airgap hole of your North Star Water Filtration System faucet, it's likely that the drain side of the faucet airgap (the 3/8” black tubing) is either plugged, restricted, or incorrectly connected to the drain point. Inspect the tubing and eliminate any restrictions or plugs. Also, verify that the drain line is properly routed.
  • M
    markhansenAug 26, 2025
    Why does my North Star Water Filtration System water taste like chlorine?
    • M
      marcus88Aug 26, 2025
      If you notice a chlorine taste or odor in the product water from your North Star Water Filtration System, it could be due to two reasons. First, the chlorine level in your water supply might be too high (exceeding 2.0 ppm), damaging the Reverse Osmosis membrane. If this is the case, you will need additional filtering before the Reverse Osmosis system. Contact your local water supplier to correct this issue before maintaining the system. Second, the prefilter may no longer be effectively removing chlorine. In this case, replace the prefilter, postfilter, and Reverse Osmosis membrane cartridges.
  • M
    Melissa ChavezAug 27, 2025
    What to do if TDS is high in North Star NSRO42C4 Water Filtration Systems?
    • M
      Michael JohnsonAug 28, 2025
      If you find a high level of total dissolved solids (TDS) in the product water from your North Star Water Filtration System, there are a couple of things to check. The water supply to the reverse osmosis system may not be within the proper specifications, so increase the water pressure or precondition the water as needed. It is also important to test both the treated and untreated water to determine system performance. If the TDS is not within the system’s performance guidelines, replace the prefilter, post filter and RO membrane cartridges. Another potential cause is a plugged drain flow control insert, which would need to be replaced.
  • R
    Robert WrightAug 29, 2025
    How to speed up water production in North Star NSRO42C4 Water Filtration Systems?
    • K
      Krystal ButlerAug 29, 2025
      If your North Star Water Filtration System is producing water too slowly, it might be because the water supply isn't within the system's specifications, so increase the water pressure or precondition the water as needed. Another reason could be that the prefilter or reverse osmosis membrane cartridges are clogged with sediment. Try replacing the prefilter cartridge first. If the production rate doesn't improve, replace the postfilter cartridge and the reverse osmosis membrane cartridge.
  • N
    novakjodiSep 18, 2025
    Why is my North Star Water System leaking at the fittings?
    • S
      Sandra ContrerasSep 18, 2025
      If your North Star Water System is leaking at the push connect fittings, it could be due to several reasons: * The tubing might not be cut square: Cut the tubing square. * The tubing might not be pushed in all the way: Push the tubing in all the way. * The tubing might be nicked: Remove the tube, cut off the nicked portion, and reinsert it. * The outer tubing surface finish might not be smooth: Remove the tube, cut off the problem area, and reinsert it.
  • R
    Richard WardSep 18, 2025
    Why does my North Star Water System faucet LED flash yellow after battery change?
    • J
      Jordan SmithSep 19, 2025
      If the faucet LED continues to flash yellow on your North Star Water System after you've changed the battery, it means the electronics weren't properly reset when the battery was changed. Reset the electronics.
  • D
    David FernandezSep 7, 2025
    Why does my North Star Water System have chlorine taste and/or odor?
    • E
      eric33Sep 7, 2025
      If your North Star Water System's RO product water has a chlorine taste or odor, it could be due to a couple of reasons. First, the chlorine level in your water supply might be too high (exceeding 2.0 ppm), damaging the Reverse Osmosis membrane; in that case, you may need additional filtering. Contact your local water supplier. Second, the prefilter may no longer be effectively removing chlorine. To resolve this, replace the prefilter, postfilter, and Reverse Osmosis membrane cartridges.
  • J
    Julie DavisSep 4, 2025
    What does it mean if the faucet LED keeps flashing yellow on my North Star NSRO42C4 Water Filtration Systems after a battery change?
    • J
      jonescynthiaSep 4, 2025
      If the faucet LED continues to flash yellow on your North Star Water Filtration System after you've changed the battery, it means that the electronics were not properly reset when the battery was changed. Reset the electronics.

Summary

Warranty

General Provisions

Outlines general terms, conditions, and limitations of the warranty.

Specifications & Dimensions

Unpack and Check Your Carton

Packing List

Lists all components included in the product packaging for verification.

Plan Your Installation

TOOLS NEEDED

Lists all tools required for the installation process.

Installation Location Options

Details considerations for under sink and remote interior installation locations.

Overview and Site Preparation

PREPARE SITE FOR INSTALLATION

Instructions for preparing the installation site before beginning work.

Step A - Install Supply Water Fitting

Step B - Install RO Drain Under Sink

INSTALL DRAIN ADAPTER KIT (Under sink Installation)

Detailed steps for installing the drain adapter kit under the sink.

Step B - Install RO Drain In Remote Location

INSTALL A REMOTE DRAIN POINT AND AIR GAP (Remote Location)

Steps for setting up a remote drain point with an air gap.

Step C: Install RO Filter Assembly

Step D - Install Storage Tank

Step E: Install RO Faucet

SELECT LOCATION OF REVERSE OSMOSIS FAUCET MOUNTING HOLE

Guidance on choosing the best location for the RO faucet.

INSTALL BATTERY

Instructions for installing the battery in the faucet electronics.

Step F - Connect Tubes

Cut tubes to length

Instructions on how to properly cut tubing for connections.

Connect tubes

Guidance on correctly connecting the tubing to fittings.

To Disconnect Tubes

Steps for safely disconnecting the tubing from fittings.

Step G - Sanitize, Test and Purge System

SANITIZE THE SYSTEM

Procedures for sanitizing the system after installation.

PRESSURE TEST THE SYSTEM

Steps for pressure testing the installed system for leaks.

PURGING THE SYSTEM

Procedures for flushing the system before use.

How Your RO Water System Works

System Components Overview

Detailed descriptions of the prefilter, RO cartridge, tank, postfilter, faucet, and electronics.

Maintenance

Cartridge Maintenance and Replacement

Guidance on maintaining and replacing prefilter, postfilter, and RO membrane cartridges.

FLOW CONTROL

Instructions for checking and maintaining the flow control.

CHANGE COLLET AND O-RING

Steps for changing the collet and O-ring in fittings.

Troubleshooting

Common System Issues and Solutions

Addresses common problems like taste, odor, slow flow, and LED errors.

Water Leaks at Faucet Airgap or Fittings

Solutions for leaks at the faucet airgap and push connect fittings.

Exploded View

Parts List

North Star NSRO42C4 Specifications

General IconGeneral
BrandNorth Star
ModelNSRO42C4
CategoryWater Filtration Systems
TypeReverse Osmosis
Stages4
Filter Life6-12 months
Membrane Life2-3 years
Storage Tank Capacity3.2 gallons
Included ComponentsFaucet, Storage Tank
Daily Production50 gallons per day

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