dux N50S136 Electric Storage Hot Water System Owner’s Manual

: July 13, 2024
: Dux

Table of Contents

dux N50S136 Electric Storage Hot Water System
Product Usage Instructions
Frequently Asked Questions
Important Safety Information
Plumbing Connections
Specifications
Filling and Draining
Electrical Connection
System Maintenance
Warranty
References
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dux N50S136 Electric Storage Hot Water System

Product Specifications

Model: 25L to 50L Electric Storage Water Heater
Models Available: 25S124P, 25S136, N25S124P, N25S136, 50S124P, 50S136, N50S124P, N50S136
Effective Date: March 1st, 2021
PTR Valve Rating: 1,000 kPa and 10 kW on 25L to 50L capacities

Product Usage Instructions

Installation

Carefully remove all packaging and transit protection from the water heater before installation.
Dispose of packaging responsibly using recycling facilities.
Follow the installation details provided in the manual for proper setup.

Safety Information

This water heater should not be used by individuals with reduced capabilities without supervision.
Keep children and animals supervised around the water heater to prevent interference.
Do not store chemicals, flammable materials, or combustible items near the water heater.

Operation

Do not modify the water heater in any way.
Do not operate the water heater with any panels or covers removed.
If the water heater is not used for two weeks or more, follow the gas dissipation procedure as described in the manual.

PTR Valve Maintenance

The PTR Valve must not be tampered with or removed.
The PTR Valve drain line should be installed downward in a frost-free environment.
Regularly operate the PTR Valve to remove lime deposits and ensure it is not blocked.

Frequently Asked Questions

Q: How often should I check the PTR Valve?

A: The PTR Valve should be checked by a licensed tradesperson for adequate performance or replaced at intervals not exceeding 5 years, or as per local regulations.

Q: What should I do if there is continuous leakage from the PTR Valve?

A: Turn off the water heater immediately and contact Dux After Sales and Service for assistance.

Carefully remove all packaging and transit protection from the heater before installation.
Dispose of the packaging responsibly using recycling facilities where they exist.
Specifications and materials may change without notice.
Effective for the above model numbers of electric storage water heaters manufactured and sold after 1st March 2021.

Important Safety Information

WARNING – THIS APPLIANCE MAY DELIVER WATER AT HIGH TEMPERATURE. REFER TO THE PLUMBING CODE OF AUSTRALIA (PCA), LOCAL REQUIREMENTS, AND INSTALLATION INSTRUCTIONS TO DETERMINE IF ADDITIONAL DELIVERY TEMPERATURE CONTROL IS REQUIRED.
WARNING – FOR THE CONTINUED SAFETY OF THIS APPLIANCE IT
MUST BE INSTALLED, OPERATED, AND MAINTAINED UNDER THE MANUFACTURER’S INSTRUCTIONS.
This water heater is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge unless they have been given supervision or instruction concerning the use of the water heater by a person responsible for their safety.
Children should be supervised to ensure they do not interfere with the water heater. Ensure animals are supervised so they do not interfere with the water heater.
DO NOT STORE CHEMICALS OR FLAMMABLE MATERIALS, OR SPRAY AEROSOLS NEAR THIS WATER HEATER.
DO NOT STORE ANY FLAMMABLE OR COMBUSTIBLE MATERIALS ON OR WITHIN 1 METRE OF THE WATER HEATER.
DO NOT PLACE ARTICLES ON OR AGAINST THE WATER HEATER
DO NOT MODIFY THIS WATER HEATER.
DO NOT OPERATE THE WATER HEATER WITH ANY PANELS OR COVERS REMOVED.
If the water heater is not used for two weeks or more, a quantity of hydrogen (which is highly flammable) may accumulate inside the water heater tank.
To dissipate this gas safely it is recommended that a hot tap be turned on for several minutes at a sink, basin, or bath, but not a dishwasher, clotheswasher, or other appliance.
During this procedure, there must be no smoking, open flame, or any other electrical appliance operating nearby. If hydrogen is discharged through the tap it will probably make a sound similar to air escaping.

RELIEF VALVE:

The Pressure & Temperature Relief (PTR) Valve must be installed with the brass reducer directly into an RP¾”(DN20) socket marked “RELIEF VALVE”.
The PTR Valve rating is 1,000 kPa and 10 kW on 25L to 50L capacities.
The valve must not be tampered with or removed. The water heater must not be operated unless this valve is fitted and in working order.
The drain line from the PTR Valve must be installed in a continuously downward direction in a frost-free environment.
The PTR Valve is to be operated regularly to remove lime deposits and to verify it is not blocked. The drain line fitted to the PTR Valve must be left open to the atmosphere.
DANGER – FAILURE TO OPERATE THE PTR VALVE EASING LEVER AT LEAST ONCE EVERY SIX MONTHS MAY RESULT IN THE WATER HEATER EXPLODING.

CONTINUOUS LEAKAGE OF WATER FROM THE VALVE MAY INDICATE A PROBLEM WITH THE WATER HEATER

The PTR Valve should be checked by a licensed tradesperson for adequate performance, or replaced at intervals not exceeding 5 years, or less in areas where local regulations apply.
It is normal for water to drip from the drain line fitted to the PTR Valve during heating cycles.
Continuous leakage of water from the PTR Valve may indicate a problem with the water heater. This may be caused by excessive water supply pressure, a faulty PTR Valve, or a faulty thermostat.
Turn off the water heater and contact Dux After Sales and Service.

OVER-TEMPERATURE ENERGY CUT-OUT:

The operation of the over-temperature energy cut-out indicates a possibly dangerous situation. Do NOT reset the over-temperature energy cut-out until the water heater has been serviced by a licensed tradesperson.

ELECTRICAL SAFETY:

This water heater is designed for single phase 230-240V a.c. supply only. The electrical connection must comply with Local Supply Authority Regulations and AS/NZS 3000 (known as the Wiring Rules).
A means for disconnection must be incorporated in the fixed wiring under the Wiring Rules.
If the power supply cord is damaged, it must be replaced by the manufacturer, a service agent, or a similarly qualified person to avoid a hazard.
Any electrical covers should be removed only by a licensed tradesperson, and only after the electrical supply to the water heater has been isolated.
When the supply wiring has been connected, ensure the wires are kept lower than the terminal block.
Excess wire is not to be looped close to the thermostat or tank.
In addition to the Pressure & Temperature Relief Valve, electric storage water heaters are fitted with a combination thermostat and over-temperature energy cut-out.
This device must not be tampered with or removed. Replacement of this device must only be carried out by a licensed tradesperson or the manufacturer.
The water heater must not be operated unless this device is fitted and in working order.

COLD WATER CONNECTION:

The water heater is intended to be permanently connected to the water supply main, and not connected by a hose-set.
This water heater is designed for direct connection to water supply pressures of up to 800 kPa on 25L to 50L capacities.
Where the mains pressure can exceed or fluctuate beyond this pressure, a pressure-reducing valve must be fitted in the cold water inlet supply.
Instructions explaining how the water heater can be drained can be found on.

INSTALLATION REQUIREMENTS GENERAL:

This water heater must be installed by a licensed tradesperson and per.
In Australia, the Plumbing Code of Australia (PCA). The products comply with the leadfree requirements of the national construction code, Volume Three;
In New Zealand, Clause G12 of the New Zealand Building Code (NZBC);
AS/NZS 3000 Electrical Installations (known as the Australian / New Zealand Wiring Rules).
Local authority regulations.
Outside Australia and New Zealand, please refer to local plumbing and building codes and regulations.
Failure to comply with these requirements may affect the warranty.
AS/NZS 3500.4 Plumbing and Drainage – Heated Water Services provides a Deemed-to-Satisfy Solution for the PCA and a Verifi-cation Method for Clause G12 of the NZBC.
Other methods of compliance are available. Dux recommends that installations conform with AS/NZS 3500.4.

NOTE FOR VICTORIA:

This water heater must be installed by a licensed person as required by the Victorian Building Act (1993).
Only a licensed person will provide a compliance certificate, showing that the work complies with all the relevant Standards. Only a licensed person will have insurance protecting their workmanship.

Plumbing Connections

Relief Valve:

The Pressure & Temperature Relief (PTR) Valve, along with a brass reducer, is supplied loose with the water heater.
The PTR Valve rating is 1,000 kPa.
The PTR Valve rating is also shown on the compliance plate. The PTR Valve must be installed with the brass reducer directly into an RP¾”(DN20) socket marked “RELIEF VALVE”. Ensure that a sealing material is applied to the PTR Valve and the brass reducer to prevent water leaks.
The unused socket (dual-handed models) marked “RELIEF VALVE” is to be plugged with one of the brass plugs supplied loose with the water heater. Ensure that a sealing material is applied to the brass plug to prevent water leaks.
The drain line from the PTR Valve must be made of copper and run under the requirements of AS/NZS 3500.4. It must be installed in a continuously downward direction in a frost-free environment.
The PTR Valve and its drain line must not be sealed or blocked. Generally, a separate drain line must be run for the valve although it may be joined with the drain line from
the expansion control valve under certain circumstances.
Care must be taken when attaching pipe saddles to the water heater. Self-drilling screws no longer than 12 mm are recommended.
It is normal for the valve to leak a small amount of water during heating cycles.
The PTR Valve is not intended to enable the connection of the water heater to supplementary energy sources such as solar panels or slow-combustion stoves.
Refer to AS/NZS 3500.4 for guidance on these types of installations.

Hot Water Connection:

The hot water pipe is to be connected to an RP¾”(DN20) socket with red surrounds at the top of the water heater.
The unused socket (dual-handed models only) with red surrounds is to be plugged with one of the brass plugs supplied loose with the water heater. Ensure that a sealing material is applied to the brass plug to prevent water leaks.
It is recommended that all hot water pipes be insulated. Hot water pipes installed outdoors should be insulated with UV-stabilized insulation.
Plastic pipes or fittings shall not be used within 1 meter of the outlet although they may be used downstream of a temperature control valve. Refer to AS/NZS 3500.4 for further details.

Temperature Protection:

Water heaters can produce very hot water. To reduce the risk of scald injury, it is mandatory under the requirements of AS/NZS 3500.4 that an approved temperature control device is fitted to the hot water supply to outlets used primarily for personal hygiene. This device should be checked at regular intervals to ensure its operation and settings remain correct.

Water Supply:

This water heater has been manufactured to suit the water conditions of most Australian & New Zealand metropolitan supplies.
Please note certain water supplies can have a detrimental effect on the water heater and its life expectancy. If you are unsure about the water supply you can obtain information from the local water supply authority.
The water heater is designed for use in areas where the Total Dissolved Solids (TDS) content of the water supply is less than 2500 mg/L. The Tank Failure Warranty does not apply in areas where the TDS exceeds 2500 mg/L.
In areas where the TDS exceeds 600mg/L, the magnesium alloy anode (supplied in standard water heaters) may become over-reactive.
To alleviate this, the magnesium alloy anode should be replaced with an aluminum alloy anode. Aluminum alloy anodes are available from your local Dux Supplier.
Water can also be very corrosive, the measure of this is the saturation index. If the water saturation index is greater than 0.40, an expansion control valve should be fitted.
If the index is greater than 0.80, the electrical heating element should be replaced with a low power density Incoloy heating element. Please consult Dux After Sales and Service for advice if required.

Cold Water Connection:

The water heater is intended to be permanently connected to the water supply main, and not connected by a hose-set.
An approved isolating valve, non-return valve, line strainer (optional but recommended), and union must be fitted between the water supply main and an RP¾”(DN20) socket with blue surrounds at the bottom of the water heater.
See the diagram for details.
All fittings must be approved by the relevant Authority. Plastic pipes or fittings shall not be used between the isolating valve and the inlet.
The unused socket (dual handed models only) with blue surrounds is to be plugged with one of the brass plugs supplied loose with the water heater.
Ensure that a sealing material is applied to the brass plug to prevent water leaks.

Water Supply Pressure:

This water heater is designed for direct connection to water supply pressures of up to 800 kPa.
Where the mains pressure can exceed or fluctuate beyond this pressure, a pressure-reducing valve must be fitted in the cold water inlet supply.

Note for New Zealand, South Australia, and Western Australia:

It is a requirement in these locations that an expansion control valve be fitted on the cold water supply line between the non-return valve and the water heater.

Specifications

Single Handed N25S1 model

Single Handed Models

Dual Handed Models

Filling and Draining

Filling the Water Heater:

The water heater must be filled with water before turning on the electrical supply.

Open all hot water taps.
Open the isolating valve at the cold water inlet slowly and allow the water heater to fill until water flows through the system.
Close each hot water tap after the air is expelled from its line.
Open the Pressure & Temperature Relief Valve for approximately 10 seconds by lifting the easing lever on the valve. Confirm water is relieved to waste through the relief valve drain pipe.
Lower the lever gently and check it closes correctly.

Draining the Water Heater:

Turn off the electricity supply to the water heater.
Turn off the cold water supply to the water heater at the isolating valve.
Gently operate the easing lever on the Pressure & Temperature Relief (PTR) Valve to release the pressure in the water heater.
Disconnect the cold water inlet union and attach a drain hose to the water heater.
Gently operate the easing lever on the PTR Valve to let air into the water heater and allow water to escape through the hose.

Cold Water Connection Diagram:

Note: a combined isolating valve/non-return valve/line strainer may be used.
The expansion control valve is only required where local regulations demand, although it is recommended in areas where the water saturation index is greater than 0.40.

Electrical Connection

General:

This water heater is designed for single phase 230-240V a.c. supply only. The electrical connection must comply with Local Supply Authority Regulations and AS/NZS 3000.

Pre-Wired Models:

Water heaters with the letter “P” at the end of their model number are factory-fitted with a power supply cord. These water heaters must only be plugged directly into a switched socket outlet (previously known as a GPO).
If the power supply cord is damaged, it must be replaced by the manufacturer, a service agent, or a similarly qualified person to avoid a hazard.

Hard Wired” Models:

Water heaters without the letter “P” at the end of their model number are not factory-fitted with a power cord.
Connection of the electrical wiring must only be carried out by a licensed tradesperson. Before removing the electrical cover, ensure the electrical power supply is safely isolated.
Connections are made at the terminal block under the water heater electrical cover, and a means for disconnection must be incorporated in the fixed wiring under the Wiring Rules.
The electrical cover may be removed by undoing the two screws at the bottom of the cover and sliding the cover downwards to disengage the top edge.
The cable entry to the connection area is through a pre-punched hole in the case designed to accept a 20 mm conduit gland. It is located beneath the electrical cover.
To prevent damage to the wiring, the cable entry must be fitted with a gland before feeding the wiring through the hole. Ensure the conduit entry is sealed correctly.
When the supply wiring has been connected, ensure the wires are kept lower than the terminal block.
Before replacing the electrical cover, press the reset button on the thermostat to ensure the over-temperature energy cut-out is set.
Ensure the water heater is filled with water before turning on the electricity supply.

System Maintenance

Regular servicing will help to extend the life of the water heater and keep it operating safely and efficiently.
Your water heater warranty is not conditional on completing the regular servicing recommended in this manual. The conditions applying to your water heater warranty are set out on page 9 of this manual.

Six Month Service:

This service may be carried out by the owner.

Stand clear of the Pressure & Temperature Relief (PTR) Valve drain pipe outlet.
Open the PTR Valve for approximately 10 seconds by lifting the easing lever on the valve. Confirm water discharges to waste through the drain pipe.
Lower the easing lever gently and check it closes correctly.
Repeat the above process for the expansion control valve (if installed).
Other than this, personally inspecting or servicing any part of the water heater is not recommended.

Five-Year Service:

This service should only be carried out by a licensed tradesperson.
In locations where the water has Total Dissolved Solids (TDS) exceeding 600 mg/L, this service is recommended every 3 years.

This service should include the following:

Replace the PTR Valve.
Replace the anode.
Inspect and flush the expansion control valve (if installed).
Drain and flush the water heater.
Inspect the condition of the electrical conduit and the water heater electrical cover. Replace any damaged components.
Replacement parts are available.

Considering a Service Call?

It is recommended that the following points be reviewed before making a service call:

No Hot Water:

Ensure the power supply circuit breaker has not “tripped”. If the water heater is on a timed tariff such as off-peak, ensure this is operating correctly.

High Energy Bills or Insufficient Hot Water:

Often the hot water usage of showers, washing machines, and dishwashers can be underestimated. Review these appliances to determine if the daily usage is greater than the capability of the water heater.
If necessary check the shower flow rates with a bucket, measuring the amount of water used over some time. If it is not possible to adjust water usage patterns, an inexpensive flow control valve can easily be fitted to the shower outlet.
Is the water heater the correct size for the requirements? Sizing details are available from your Dux supplier.
Is there a leaking hot water pipe or a dripping hot water tap? A small leak can waste a large quantity of hot water. Replace faulty tap washers and arrange for your plumber to rectify any leaking pipe work.
Is the Pressure & Temperature Relief Valve discharging too much water? See below.
Continuous Trickle of Water from Pres-sure & Temperature Relief (PTR) Valve: This is most likely due to a build-up of foreign matter. In this case, try gently raising the easing lever on the PTR Valve for a few seconds, then release gently.
This may dislodge a small particle of foreign matter and rectify the fault.

Water Discharge from PTR Valve:

It is not unusual for a small quantity of water to discharge during the heating of water in the storage tank. The amount of discharge will depend on hot water usage and the size of the storage tank.
As a guide, it will discharge about 2% of the volume of the water heated.
Continuous leakage of water from the PTR Valve may indicate a problem with the water heater. Turn off the water heater and contact Dux After Sales and Service.
If after checking the above points, the problem has not been identified, please contact Dux After Sales and Service.

Warranty

Dux Electric Storage Water Heater – Warranty Summary:

Your water heater is specified with a warranty as set out in the table below.
The fault must appear within the defined time, which commences from the date of installation (or the manufacturing date of the unit if proof of the date of installation is not available) to be covered.

Dux Proflo Water Heater Warranty

Dux Proflo 25L – 50L Water Heater Warranty| Tank Warranty| Parts & Labour
---|---|---
Single Family Dwelling| 7 years| 1 year
All Other Applications| 3 years| 1 year

The benefits provided to you by this warranty are in addition to any other rights and remedies available to you under the Australian Consumer Law.

Parts and Labour Warranty:

Dux Manufacturing Limited (“Dux”) warrants against defects in the water heater arising from faulty materials or workmanship.
During the period (as specified in the table above), Dux will repair or replace any failed component or where necessary, in the absolute discretion of Dux, replace the water heater, free of charge including reasonable labor costs incurred during normal business working hours.

Tank Failure Warranty:

Dux warrants against failure of the storage tank, under its application (as specified in the table above). Conditions apply.
During the first year of the warranty, Dux will provide a replacement water heater free of charge including installation and labor costs.
Installation and other labor costs are the responsibility of the owner if the water heater is outside parts and labor warranty.

Warranty Conditions:

The warranty only applies to the water heater itself and the components supplied with the water heater by Dux. The warranty does not cover components supplied by others, including the installer.
The tank failure warranty does not apply if the water heater has been connected to a water supply where the Total Dissolved Solids content is greater than 2500 mg/L.
These warranties do not apply to defects that are a result of, without limitation, the following.
failure to install the water heater in accordance with the installation instructions or statutory requirements;
faulty plumbing or water supply including excessive pressure;
faulty power supply;
use of the water heater in a manner contrary to this manual or other instructions provided by Dux;
alterations or repair of the water heater other than by an accredited and licensed service agent or technician;
accidental damage or abuse.
If the water heater is installed in a position that does not comply with the installation instructions or statutory requirements, then this warranty does not cover major dismantling or removal of cupboards, doors, walls, or special equipment and/or excessive labor, at the determination of Dux, to make the water heater accessible for repair or replacement.
Where the Dux water heater is located outside the metropolitan area of a capital city and is more than 100km from a Dux office or Dux agent, the Owner will be responsible under the warranty for paying the costs of transporting the water heater and or any component in the water heater to and from an approved Dux agent or Dux office (including any insurance associated with that transport), or paying the traveling time of an approved Dux agent to and from the owner’s premises.

Commencement of Warranty:

The warranty period commences from the date of installation of the water heater. Where proof of the date of installation is not available, the warranty period commences on the date of manufacture of the water heater.
This is shown on the compliance plate on the outside of the water heater.
The replacement of the water heater, or a component of it, under this warranty, does not change the warranty commencement date. The repaired or replaced part/tank does not carry any additional warranty period.
The original commencement date continues to apply.

Exclusion and Limitation of Liability:

In addition to any other provisions set out in this document and to the maximum extent permitted by any applicable law or regulation, Dux will not be liable for any claim.

for consequential loss to any property arising directly or indirectly out of or connected to the supply or installation of the water heater. This includes but is not limited to furnishings, carpets, foundations, housing effects, and buildings.
for any direct or indirect economic or financial loss of any nature.
arising out of or connected to a water heater that has been uninstalled, resold, or moved from its original installation location.
arising out of or connected to any misuse, or other use, installation, or maintenance that is not under the procedures and requirements set out in this document.

To the extent permitted by law, the liability of Dux shall be limited to the cost of the repair or replacement of the water heater.
The Australian Consumer Law (“ACL”): Our goods come with guarantees that cannot be excluded under the Australian Consumer Law.
You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage.
You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
If Dux fails to meet a guarantee under the ACL, your remedy for such failure may be limited to any one or more of the following.
replacement of the water heater;
repair of the water heater;
refunding the cost of the water heater;
payment of the reasonable costs of having the water heater repaired;
payment in respect of the reduced value of the water heater.

The Consumer Guarantees Act 1993 (New Zealand):

Our goods come with guarantees that cannot be excluded under the Consumer Guarantees Act 1993 (New Zealand). If the goods fail to comply with the applicable guarantees set out under the Consumer Guarantees Act 1993 (New Zealand) being the guarantee as to acceptable quality, the guarantee as to correspondence with description or the guarantee as to repair and parts, or if the goods fail to comply with any express guarantee given by Dux, then you are entitled to a replacement or refund and for compensation for any other reasonably foreseeable loss or damage.

How to Make a Warranty Claim:

Warranty claims can be placed by completing the following steps.
Contact Dux on one of the numbers listed below.
Select the “Service” option followed by the “Hot Water” option.
Provide the serial number and model number of the water heater. This can be found on the compliance plate on the outside of the water heater.
Provide your full name, address, and contact number.
Provide proof of date of installation for warranty to commence from that date, rather than from the date of manufacture. See Commencement of Warranty on.
Please note, that if the defect or fault is not covered by the warranty or guarantee, you will be responsible for the costs incurred by the service agent or technician.

Contact Details:

Dux Manufacturing Limited
Lackey Road
Moss Vale, NSW, 2577
Australia
1300 365 115 (Australia)
0800 729 389 (New Zealand)
Email: duxaftersales@dux.com.au

Electric Storage Water Heaters

For advice, repairs, and service, call: 1300 365 115 (Australia) 0800 729 389 (New Zealand)

Please Register Your Water Heater

Please take a moment to fill out your details for warranty registration at: www.dux.com.au/warranty or use your smartphone to scan this code:
This will ensure all your current details are registered with us for prompt warranty service if required.
To view our privacy policy please visit http://www.dux.com.au/p/privacy
Date of Installation: ……………………………………………………………………………………………..
Installer’s Name: … ……………………………………………………………………………………………….
Installer’s Company: …………………………………………………………………………………………….
Installer’s Licence No: ………………………………………………………………………………………….
Installer’s Signature: ……………………………………………………………………………………………