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North Star NST45ED1 - User Manual

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7366546 (Rev. B 1/24/18)
Systems tested and certified by the Water Quality
Association against CSA B483.1.
Systems tested and certified by NSF International
against NSF/ANSI Standard 44
for hardness reduction and efficiency,
and certified to NSF/ANSI Standard 372.
Installation and Operation Manual
If you have any questions or concerns when
installing, operating or maintaining your water
softener, call our toll free number:
1-800-972-0135
or visit www.northstarwater.com
When you call, please be prepared to provide
the model and serial number of your product,
found on the rating decal, located on the back
of the controller top cover.
Manufactured and warranted by
North Star Water Treatment Systems
1890 Woodlane Drive
Woodbury, MN 55125
Designed, Engineered &
Assembled in the U.S.A.
How to install, operate
and maintain your Demand
Controlled Water Softener
Models NST30ED
NST45ED1
NST70ED1

Table of Contents

Questions and Answers

  • D
    Daniel HannaAug 7, 2025
    How to fix no soft water from North Star NST45ED1 Water Dispenser?
    • R
      Richard JuarezAug 7, 2025
      If your North Star Water Dispenser isn't producing soft water, several issues could be the cause. First, ensure the salt storage tank has enough salt; if empty, add salt and initiate a “Recharge Now”. Another possibility is a salt bridge, a hardened layer of salt; break this bridge and then start a “Recharge Now”. Also, check for power loss by verifying the power supply is correctly plugged in and the circuit breaker hasn't tripped. Ensure the manual bypass valve(s) are in the service position. Lastly, inspect the nozzle and venturi assembly for any blockages or damage, cleaning or repairing as necessary. Check that the valve drain hose isn't kinked, sharply bent, or raised too high.
  • C
    Courtney NunezAug 21, 2025
    Why is my North Star NST45ED1 Water Dispenser sometimes dispensing hard water?
    • J
      Jason BrownAug 21, 2025
      If you're sometimes getting hard water from your North Star Water Dispenser, it could be due to several reasons. One possibility is that hard water is being bypassed during recharge because the present time or recharge time settings are incorrect; check and correct these settings. Another reason could be that the hardness number setting is too low; check the current hardness setting and increase it if needed. Avoid using hot water during recharges, as the water heater refills with hard water. Also, there might be an increase in the actual hardness of your water supply; have a sample tested and adjust the 'Hardness' setting accordingly. Finally, check the turbine to ensure it's turning freely.

Summary

Water Softener Warranty

Specifications & Performance Claims

Before You Start

Installation Requirements

Location Requirements

Guidelines for selecting a suitable installation location, avoiding hazards and damage.

Plumbing Codes & Air Gaps

Requirements for plumbing connections, adherence to codes, and proper drain air gap installation.

Typical Installation Illustrations

Installation Instructions: Initial Steps

Turn Off Water Supply

Install Bypass Valve Adapters

Installation Instructions: Plumbing

Complete Inlet and Outlet Plumbing

Install Valve Drain Hose

Installation Instructions: Tank & Brine

Test For Leaks

Steps to check for water leaks at all connections after installation is complete.

Installation Instructions: Final Setup

Add Water and Salt to Tank

Sanitize Water Softener

Programming the Electronic Controller: Time & Hardness

Set Present Time of Day

Set Water Hardness Number

Inputting the water's hardness level (gpg) for optimal regeneration cycles.

Programming the Electronic Controller: Regeneration

Controller Features and Options

Wiring Schematic

Routine Maintenance

Adding Salt

Frequency and guidelines for checking and adding salt to the brine tank.

Breaking a Salt Bridge

How to identify and resolve salt bridges that form in the brine tank.

Cleaning Nozzle & Venturi

Instructions for cleaning the nozzle and venturi assembly for proper brine draw.

Troubleshooting Guide: Initial Checks

Initial Troubleshooting Checks

Troubleshooting: Diagnostics

Automatic Electronic Diagnostics

Explanation of the controller's self-diagnostic function and error code meanings.

Manually Initiated Diagnostics

Procedures for accessing and using diagnostic modes for detailed system checks.

Troubleshooting: Resets & Checks

Resetting to Factory Defaults

Manual Advance Regeneration Check

North Star NST45ED1 Specifications

General IconGeneral
MaterialPlastic
ColorWhite
Dimensions330 x 330 x 980 mm
Power Consumption500W
Safety FeaturesChild lock
Hot Water Temperature90-95°C

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