Dux Radiant 135AN User manual

RADIANT
OWNER’S MANUAL
WARRANTY INFORMATION AND
INSTALLATION INSTRUCTIONS
Gas Storage Water Heater
Models: 135AN 170AN
FOR ADVICE, REPAIRS AND FAST SERVICE:
1300 365 115 (AUSTRALIA)
0800 729 389 (NEW ZEALAND)
Effective for all Mains Pressure Storage Hot Water Units manufactured and sold after the 1st Oct 2005
Part No: H3568
Version: 10404A

CONTENTS
APPLIANCE & SERVICE DETAILS...........3
INSTALLATION DETAILS ..........................4
OPERATING INSTRUCTIONS..................10
SERVICE INFORMATION .........................12
WARRANTY ..............................................14
SPECIFICATIONS.....................................16
WELCOME TO RADIANT HOT WATER
Your decision to purchase a RADIANT water heater will reward you for many years to
come.
RADIANT water heaters are manufactured in Australia in a state-of-the-art facility, using a
Quality Endorsed Company production system.
This is your assurance that you have purchased the highest quality water heater available,
one that will provide continuous hot water for all your needs - safely, economically, and for
many years to come.
FEATURES OF YOUR RADIANT
GAS WATER HEATER
Advanced heating design for better reliability.
High efficiency design.
Adjustable Thermostat - allows you to adjust water temperature, saving energy costs
during warmer months of the year.
2

WARRANTY RETURN CARD
Enclosed you will find a warranty card - please fill in the details and return immediately.
This will ensure prompt service under warranty, if required.
See page 14 for terms of warranty.
Privacy Act Amendment 2000; If and whenever warranty service is required, your personal details will only be given to an
Authorised Dux Service Agent for the express purpose of carrying out the arranged warranty service work agreed by you the client
and Dux Manufacturing Limited.
APPLIANCE DETAILS
For future convenience, would you kindly fill in the following details and retain with your
original invoice for your own records.
Owner’s Details:
Surname:............................................ Given Name(s):........................................................
Address:..................................................................................................................................
Town/Suburb:..........................................................................................................................
State/Territory:................................................... Postcode:..................................................
Date of Purchase:.......................... Purchased From:..........................................................
Model:............................................ Serial Number:.............................................................
Date of Manufacture:.............................................................................................................
Gas Type: () Natural Gas LPG
(Details on Data Plate on water heater)
Installer’s Details:
Date of Installation:........................ Installer’s Name:..........................................................
Address:.................................................................................................................................
Installer’s Signature:..............................................................................................................
SERVICE DETAILS
Date of Service:.............................. Serviced By:................................................................
Work Carried Out:.................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
Signature of Service Agent:..................................................................................................
3

INSTALLATION DETAILS
This water heater must be installed by a licensed tradesperson, and in accordance with:
AS/NZS 3500.4 - “Plumbing and Drainage Code, Part 4: Heated water services”.
AS5601/AG601 “Installation Code for Gas BurningAppliances and Equipment”.
Local authority regulations.
Notice to Victorian customers from the Victorian Plumbing Industry Commission – this
water heater must be installed by a licensed person as required by the Victorian
Building Act 1993. Only a licensed person will give you a compliance certificate,
showing that the work complies with all the relevant Standards. Only a licensed person
will have insurance protecting their workmanship for 6 years. Make sure you use a
licensed person to install this water heater and ask for your Compliance Certificate.
Note: This water heater is not suitable for pool heating.
This water heater is designed for direct connection to water supply pressures up to
1100kPa. Where the mains pressure can exceed or fluctuate beyond 1100kPa, a pressure
limiting device (complying with AS1357) must be fitted in the cold water inlet supply. This
device must be installed after the isolating valve and set at or below 1100kPa.
Note: Ensure that the water heater is suitable for the available gas supply.
CAUTION: This water heater delivers hot water at temperatures exceeding 50oC. Refer to
AS/NZS3500 and local regulations regarding the need for additional hot water delivery
temperature control.
LOCATION
The water heater should be located as close as possible to the most frequently used hot
water outlet. Adequate access must be made for service to the burner, gas control, relief
valve and anode.
Note: All models are equipped with a sacrificial anode, accessible through the top cover.
Allow 50% of the height of the water heater for clearance to replace the anode.
OUTDOOR Installation
The water heater should be installed with the minimum clearances as shown in Figure 1.
The water heater should be installed on a level, fireproof plinth at least 50mm above the
surrounding ground level. Position the two wall brackets 100 mm below the top of the unit
and secure them so that they are protruding approximately 10mm beyond the back of the
heater. Position the unit in place and secure the brackets to the wall (as per figure 1).
4

Figure 1: Clearances Required for Outdoor Installation
COLD WATER CONNECTION
An approved isolating valve, non-return valve, line strainer (optional but recommended)
and union must be fitted between the supply main and the RP¾/20 socket in the water
heater. All fittings must be approved by the relevant Authority. See Figure 2 for details.
Note for S.A. and W.A.: It is a state requirement that a pressure relief valve be fitted on
the cold water supply line between the non-return valve and the water heater (see Figure
2).
Warning: A separate drain line must be used for this relief valve. It is not permitted to
couple drain lines from relief valves into a single common drain line.
HOT WATER CONNECTION
A relief valve is supplied with a ¾” reducing bush to fit into the RP¾/20 tank socket. The
hot water drain pipe and relief drain line to be installed as per figure 2. For the most
economical operation of the water heater, it is recommended that all hot water lines are
insulated.
PRESSURE & TEMPERATURE RELIEF VALVE
The pressure & temperature Relief Valve (rated at 1400kPa) is supplied loose with the
water heater. The valve must be installed into the top socket marked “RELIEF VALVE”.
5

GAS CONNECTION
Gas piping should be connected through the side of the case (see Figure 2). The plastic
grommet must be installed around the pipe and clipped into the case. The gas control is
fitted with a RC½/15 socket. A union connection should be used. Pipe sizes should be in
accordance with AG601.
HOT WATER
OUTLET
DRAIN
NOTE; A COMBINED
ISOLATING VALVE
/NON-RETURN VALVE / LINE
STRAINER MAY BE USED
UNION
CONNECTION
NON-RETURN
VALVE
LINE
STRAINER
COLD
WATER
INLET
GAS SUPPLY
TEMPERATURE AND
PRESSURE OPERATED
RELIEF VALVE
EXPANSION
VALVE ONLY
REQUIRED
WHERE LOCAL
REGULATIONS
DEMAND
DRAIN
ISOLATING
VALVE
(SPINDLE
VERTICAL)
Figure 2: Hot & Cold Water Connections
6

7

WATER QUALITY
Your RADIANT water heater has been manufactured to suit water conditions of most
Australian metropolitan supplies. Please note that harsh water supplies can have a
detrimental effect on the water heater and its life expectancy. If you are unsure about your
water quality you can obtain information from your 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.
In areas where the TDS exceeds 600mg/L it is possible that the magnesium alloy anode
(supplied in the heater) may become over reactive. To alleviate this, the magnesium alloy
anode should be replaced with an aluminium alloy anode, available from your local Dux
supplier, by removing the seven (7) screws in the case top to gain access to the anode
socket.
Water can also be very corrosive, the measure of this is the saturation index, if the water
saturation index is greater than 0.40 a expansion control valve should be fitted and where
the index is greater than 0.80 an aluminium anode should be fitted. Please consult our
Service Department for advise if required.
TESTING THE WATER HEATER
Test operation by lighting the water heater (see Operating Instructions). Check that the
test point pressure of water heater complies with the Data Plate. Check burner aeration
and check that the pilot flame plays on the last 4mm of the thermocouple. If necessary,
adjust accordingly by following the instructions under “Adjustments” in the Service
Instructions.
Note: Instruct owner in water heater operation before leaving.
The appliance is not intended for use by young children or infirm persons without
supervision. Young children should be supervised to ensure that they do not play
with the appliance.
WARNING!
It is essential for the safe operation of this gas heater that clothing or any other flammable
material should not be placed against or on top of the water heater. In addition, do not
store flammable or corrosive materials, such as dry cleaning fluids, pool chemicals, etc., in
close proximity to the heater.
The use of aerosol sprays in the vicinity of the heater should be avoided. The propellant
gases used in these devices, e.g. fly-spray, hair-spray and laundry aids, can breakdown in
the flames of the burner and produce corrosive agents.
8

CAUTION!
If this water heater is left in an operating condition and unused for two weeks or more, a
quantity of hydrogen (which is highly flammable) may accumulate in the top of the water
cylinder. 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, clothes washer 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 an unusual sound as with air escaping.
SAFETY INFORMATION:
WARNING:
For safe performance this water heater is fitted with:
1. Thermostat.
2. Over-temperature energy cut-out.
3. Combination pressure & temperature operated relief valve.
These devices must not be tampered with or removed.
The water heater must not be operated unless each of these devices is fitted and in
working order.
Relief valves should be checked for adequate performance or replaced at intervals not
exceeding 5 years, or less in areas where there is a high incidence of water deposits. The
lever on the relief valve must be pulled to operate the valve at least once every 6 months.
Failure to operate the relief valve easing gear at least once every six (6) months may result
in the water heater exploding.
IMPORTANT
The relief valve and its drain outlet pipe must not be sealed or blocked. It is normal for
valve to overflow during heating cycle.
WARNING !
GAS FITTER:
This water heater should be checked on installation and the test point pressure set in
accordance with that marked on Data Plate (see “Testing the Water Heater” in the
Installation Instructions). Failure to accurately set the pressure can result in damage to the
water heater, and automatically cancels the Manufacturer’s Warranty. This water heater is
to be installed only by an Authorised Person. This water heater must be installed on a
fire-proof base (see Figure 1).
USER:
DO NOT place articles on or against this appliance.
DO NOT use store chemicals or flammable materials, or spray aerosols near this
appliance.
9

DO NOT operate with panels or covers removed from the appliance.
FILLING THE WATER HEATER
Open all hot water taps. Open stop cock at the cold water inlet and allow water heater to
fill until water flows through the system. Close each hot water tap after the air is expelled
from its line.
LIGHTING THE WATER HEATER
The water heater must be filled with water before lighting. Instructions for lighting
procedure are on the inside of the access cover and shown in Figure 4.
The access cover is removed by lifting the cover upwards and away from the water heater.
The unit is fitted with a thermostat that incorporates a Thermal Overload Safety Cut-Out. In
the event of thermostat failure, the Safety Cut-Out will automatically and permanently cut
off the supply of gas to the burner. If this happens, your heater will not light and you should
call your local Dux agent.
FITTING OF PLUMBING INSULATION CAPS
To ensure optimum operating efficiency of the water heater the two Plumbing Insulation
Caps supplied with the water heater must be fitted to the two brass plugs (also provided
with the water heater) used to seal the unused hot and cold water connection fittings on
these dual handed plumbing featured models. Refer Figure 3 below:
10

Figure 3: Fitting of Plumbing Insulation Caps
11

OPERATING INSTRUCTIONS
Figure 4: Lighting Instructions
12

RECOGNITION OF ABNORMAL OPERATION
1. PRESSURE & TEMPERATURE RELIEF VALVE RUNNING:
It is not unusual for the valve to allow a small quantity of water to escape during the
heating cycle. The amount of discharge will depend on hot water usage. As a guide, if
it discharges more than 20 litres of water in 24 hours there may be a problem.
Continuous trickle:
Likely build up of foreign matter. Try gently raising the easing lever on the relief valve
for a few seconds. This may dislodge a small particle of foreign matter and rectify the
fault. Release lever gently.
Steady flow emitted:
Likely causes are excessive water supply pressure or a faulty pressure valve.
2. NO HOT WATER
Is the relief valve discharging too much water? See “Pressure & Temperature Relief
Valve Running”.
Do you have the correct size water heater for your requirements? Sizing details are
available from your Dux supplier.
Is one outlet (especially the shower) using more hot water than you think?
Carefully review the family's hot water usage and if necessary check the shower flow
rates with a bucket and a watch.
If it is not possible to adjust water usage patterns, an inexpensive flow control valve can
easily be fitted to the shower outlet.
3. HIGH GAS BILLS
Is the relief valve discharging too much water? See “Pressure & Temperature Relief
Valve Running”.
Is one outlet (especially the shower) using more hot water than you think? See “No Hot
Water”.
Is there a leaking hot water pipe or dripping hot water tap? A small leak can waste a
large quantity of hot water.
Replace faulty tap washers and have your plumber rectify any leaking pipework.
13

SERVICE INFORMATION
SIX MONTHLY SERVICE
(BY OWNER)
Operate the pressure & temperature relief valve for approximately 10 seconds by raising
the easing lever on the top of the valve to ensure water is relieved to waste through the
relief drain pipe. Check to ensure the valve closes correctly.
ANNUAL SERVICE
(BY AUTHORISED PERSONNEL ONLY):
Clean and service the gas burner and pilot.
FIVE YEAR SERVICE
(BY AUTHORISED PERSONNEL ONLY)
The five yearly service should be carried out by a licensed Tradesperson. It is
recommended that this service be carried out by the local Dux agent. The service should
include the following:
Replace the pressure & temperature relief valve.
Replace the anode.
Clean and service the gas burner and pilot.
Flush the cylinder.
COMMISSIONING ADJUSTMENTS
(a) Main Gas Pressure Regulator Adjustment
The main burner pressure must be set at installation and should not need readjustment. If
adjustment is necessary, proceed as follows: (The pressure is best checked by connecting
a water manometer or equivalent to the test point nipple on the gas control. The test point
pressure must comply with the value on the Data Plate.)
UNITROL Gas Control:
(i) Remove regulator adjustment cap from top of gas control.
(ii) Remove sealant from adjustment slot if necessary.
(iii) Light the burner. Rotate adjustment screw clockwise to increase, or anti-clockwise
to decrease pressure.
(iv) Replace regulator adjustment cap.
14

SIT Gas Control (operating on Natural Gas):
(i) Light the burner. Remove temperature selector knob from the front.
(ii) Remove plastic cap covering the “NO PR” screw.
(iii) Check that exclusion screw “NO PR” is fully turned anti-clockwise
(iv) Rotate “PR ADJ” screw clockwise to increase, or anti-clockwise to decrease
pressure.
SIT Gas Control (operating on LPG):
(i) Light the burner. Remove temperature selector knob from the front.
(ii) Remove plastic cap covering the “NO PR” screw.
(iii) Turn “PILOTADJ” screw fully anti-clockwise.
(iv) Put pressure governor fully “out of service” by screwing the “NO PR” fully home in
a clockwise direction.
Note: Pressure adjustments at gas cylinder regulator should be conducted as required
to ensure correct supply pressure to water heater as per AG601.
(b) Ignition System (Spark Gap)
Check that the gap between the spark electrode and the pilot burner is 3 - 5mm and adjust
as necessary. Push the igniter button to test for a spark. (WARNING: Only test the spark
gap where there is no build up of gas.)
15

RADIANT Hot Water Unit
Manufactured by Dux Manufacturing Limited (“Dux”)
Terms of Warranty and Replacement Guarantee
Effective for all Mains Pressure Storage Hot Water Heaters manufactured and sold after 1st July 2005.
THE RADIANT HOT WATER UNIT THAT YOU HAVE PURCHASED COMES WITH A COMPREHENSIVE 1 YEAR PARTS AND
LABOUR WARRANTY AND A GUARANTEE TO REPLACE YOUR HOT WATER UNIT IF THE INNER CYLINDER FAILS
WITHIN 5 YEARS.
The terms of the Warranty and replacement guarantee are set out below.
WARRANTY
1. Your hot water unit and its components are covered by a 1 year warranty against defective factory parts or workmanship
from the date your hot water unit is installed. If the date of installation is unknown, the warranty commences 1 month after
the date of manufacture (which can be found on the serial plate on the hot water unit).
2. This warranty is for normal use of the hot water unit and covers the repair and/or replacement of any failed component in
the hot water unit or where necessary , the hot water unit itself. Under this warranty Dux will repair or replace the component
or hot water unit free of charge (except for certain transport or travelling time costs which may be payable by the owner
under clause 9 below). The decision to repair or replace the component or hot water unit will be entirely at the discretion of
Dux.
3. The warranty only applies to defects in the hot water unit which have arisen solely due to faulty materials or workmanship.
5 Year Replacement Guarantee.
4. If an inner cylinder fails on a RADIANT hot water unit, within a further 4 years after the end of the 1 year warranty period,
Dux will provide a free replacement hot water unit at the nearest approved Dux agent or Dux office to the owners home.
Under this replacement guarantee, the transport, installation and labour costs of delivering the replacement hot water unit
and removing and replacing the existing hot water unit with the replacement hot water unit will be charged to the
responsibility of the owner of the existing hot water unit.
Scope of Warranty and Guarantee
5. The warranty and replacement guarantee do not apply to any defects or damage not due to faulty factory parts or
workmanship, including but not limited to defects or damage caused by or resulting from:-
a) accidental damage, abuse, misuse, maltreatment, abnormal stress or strain, harsh or adverse water conditions,
contamination or corrosion from particles in the water supply, excessive water pressure or temperature or neglect of any
kind to the hot water unit or its components.
b) alteration or repair of the hot water unit other than by an approved Dux agent or a Technician of a gas or electricity utility
approved by Dux.
c) attachment of any parts or accessories other than those manufactured or approved by Dux; and
d) faulty or improper installation of the hot water unit, including installation otherwise than in accordance with the instructions
contained in the owner’s manual supplied by Dux.
6. The warranty only applies to the hot water unit and/or components in the hot water unit and does not cover any plumbing or
associated parts, including but not limited to, pressure limiting valves, stop cocks, non return valves, electrical switches,
pumps or fuses, supplied by any person installing the hot water unit.
7. Where a hot water unit or a component in a hot water unit is replaced by Dux, the balance of any original warranty or
replacement guarantee period will remain effective. The replacement part or hot water unit does not carry any additional
warranty or replacement guarantee.
16

8. Where the hot water is located outside the metropolitan area of a capital city and is:-
a) more than 25 kilometres from a Dux office; or
b) more than 25 kilometres from a Dux agent
the owner will be responsible under the warranty, for paying the costs of transporting the hot water unit or any component in the
hot water unit to and from an approved Dux agent or to a Dux office (including the costs of any insurance associated with that
transport) or paying the travelling time of an approved Dux agent to and from the owner’s house premises.
9. Where the warranty applies but the hot water unit is installed or located in a position that does not comply with the Dux
installation instructions or any relevant statutory requirements, the owner of the hot water unit will be responsible for the
costs of:-
a) the dismantling or removal of cupboards, doors, walls of special equipment and
b) any labour required.
to gain access to and to bring the unit to a position that complies with the installation instructions or relevant statutory
requirements.
10. Dux’s obligations under this warranty and replacement guarantee are limited to repairing or replacing the hot water unit or
components. To the extent permitted by law, Dux will not be liable for any loss or damage to furniture, carpets, walls,
foundations or any other consequential loss of any kind caused by a defect in the hot water unit or any component.
11. Any claim under the warranty or replacement guarantee must include full details of the defect and/or damage to the hot
water unit and/or component in the hot water unit. All claims must be made within one month of the detection of the defect.
12. In addition to this warranty and replacement guarantee, certain legislation (including the Trade Practices Act 1974 and
consumer protection legislation of the States and Territories) gives the owner certain rights which cannot be excluded,
restricted or modified. Nothing in this warranty and replacement guarantee has the effect of excluding, restricting or
modifying those rights.
13. In the case of a hot water unit acquired for other than personal domestic or household use, Dux’s liability for a breach of a
condition or warranty implied by Division 2 of Part V (other than Section 69) of the Trade Practices Act (1974) and any
equivalent State or Territory legislation is expressly limited to any one or more of the following, as determined by Dux:-
a) the replacement of the hot water unit;
b) the repair of the hot water unit;
c) the payment of the cost of replacing the hot water unit or of acquiring an equivalent hot water unit;
d) payment of the cost of having the hot water unit repaired.
17

18
SPECIFICATIONS
Figure 4 : Dimensions of Unit
Model No. Mass DIMENSIONS (mm) Nominal
(kg) A B C Baffle Length
Capacity ( L)
Unitrol EuroSIT
135AN 76 1603 1327 336 315 1125 135
170AN 87 1898 1622 336 315 1236 170