Dux 21ENB5N User manual

Thank you for purchasing this Dux Gas Water Heater.
Before using, please:
Read this manual completely for operating instructions.
Confirm warranty and proof of purchase.
Keep this manual where it can be found whenever necessary.
Installation must conform with local codes, or in the absence of local codes, AS/NZS5601, AS/
NZS3500.4, AS/NZS3000 wiring regulations and all Local Building, Water and Gas fitting regulations.
Dux reserves the right to discontinue, or change at any time, the designs and/or specifications of
its products without notice.
* Note :This appliance requires a minimum flow rate to operate of 2.5 litres/min., water fixtures with a
flow rate of 7.5 litres/min. or higher are recomended.
For optimum performance we reommend installation of Dux optional temperature controllers.
Owners Guide
Condensing Models
26ECB5N
26ECB5L
26ECB6N
26ECB6L
21ECB5N
21ECB5L
21ECB6N
21ECB6L
Non Condensing Models
21ENB5N 26ENA5N
21ENB5L 26ENA5L
21ENB6N 26ENA6N
21ENB6L 26ENA6L
17ENB5N
17ENB5L
17ENB6N
17ENB6L
SBB80PS
Rev. 06/16
Ex. 26ECB5N
*SBB80PS*

Owner's Guide
2Part: XXXXX Rev XX
To prevent damage to property and injury to the user, the icons shown below will be used to warn of
varying levels of danger.
Every indication is critical to the safe operation of the water heater and must be understood and observed.
Potential dangers from accidents during installation and use are divided into the following four
categories. Closely observe these warnings; they are critical to your safety.
Icons warning of risk level
Other icons
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
DANGER indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
CAUTION used without the safety alert symbol indicates a potentially
hazardous situation which, if not avoided, may result in property damage.
WARNING
CAUTION
CAUTION
DANGER
Electric
Shock
Prohibited No flame.
Be sure
to do.
Don’t
touch.
Don’t
disassemble
the equipment.
Don’t touch
with a wet
hand.
Earth
High
Temperature.
Important Safety Information
If the information in this manual is not followed exactly, a fire or explosion
WARNING
may result causing property damage, personal injury, or death.
- Do not store or use petrol or other ammable vapours and liquids in the
vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light the appliance.
• Do not touch any electrical switches; Do not use electrical appilances,
including the phone” inside the building.
• Immediately call you gas supplier, from a safe distance from the gas leak.
- To be installed and serviced only by an authorised person
- This appliance is not suitable for use as a pool heater

Owner's Guide
3
Part: XXXXX Rev XX
WARNING
No flame.
A. This water heater does not have a pilot.
It is equipped with an ignition device that
automatically lights the burner. Do not try
to light the burner by hand.
B. BEFORE OPERATING smell all around the
water heater area for evidence of leaking gas.
Be sure to smell next to the oor because
some gas is heavier than air and will settle
on the oor.
WHAT TO DO IF YOU SMELL GAS.
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your building.
• Immediately call your gas supplier.
Follow the gas supplier’s instructions.
C.
Use only your hand to turn the gas valve knob.
Never use tools. If the knob will not turn by
hand, don’t try to repair it. Call a qualied
service technician. Force or attempted repair
may result in a re or explosion.
D. Do not use this water heater if any part has
been under water. lmmediately call a qualied
service technician to inspect the water heater
and to replace any damaged parts.
Be sure
to do.
Be sure
to do.
High
Temperature.
Be sure
to do.
Leave the proper clearance between
the water heater and nearby objects
(trees, timber, boxes with ammable
materials etc.).
Upper:
Min. 500mm
Right side:
Min. 500mm
Left side:
Min. 500mm
Front:
Sug. 600mm
Check the temperature
of the running hot water
before entering the
shower.
If you detect abnormal combustion
or abnormal odours, or during an
earthquake, tornado or re:
1. Turn off the hot water supply
2. Turn off the power to the water heater
3. Turn off gas and water supply valve.
4. Call Dux on AU 1300 365 115.
When a gas leak is noticed:
1. Stop use immediately
2. Close the gas valve
3. Contact your gas supplier immediately
Check the temperature
before stepping into
the bath tub.
Do Not Install Indoors.
This will cause carbon
monoxide poisoning and a
potential fire hazard.
Prohibited
Prohibited
Prohibited
Vapours
Vapours from ammable liquids will explode and catch re causing death or severe burns.
Hot Water Heater temperatures over 50 °C can cause
severe burns instantly or death from scalding.
Do not use or store flammable products such as petrol, solvents or
adhesives in the same room or area near the water heater.
Keep ammable products: Vapours:
1. Far away from the water heater.
2. In approved containers.
3. Tightly closed.
4. Out of children’s reach.
1. Cannot be seen.
2. Vapours are heavier than air.
3. Go a long way on the oor.
4. Can be carried from other rooms to the main burner by air currents.
Children, disabled and elderly are at the highest risk of
being scalded. Feel water temperature before bathing or
showering. Temperature limiting valves are available, ask
licensed installer.
DANGER

Owner's Guide
4Part: XXXXX Rev XX
Important Safety Information
Prohibited
Be sure
to do.
Prohibited
Prohibited
Prohibited
Prohibited
Carbon Monoxide Poisoning
Hazard. Do not install this water
heater in a mobile home, recreation
vehicle or on a boat.
Installation and service must be
performed by a qualied insraller,
service agency or the gas supplier.
Do not use hair spray or spray
detergent in the vicinity of the
heater.
Do not allow small children to play
unsupervised in the bathroom or with
the water heater .
Do not allow small children to bathe
unsupervised.
This appliance 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
use of the appliance by a person
responsible for their safety.
Prohibited
Do not use combustible chemicals
such as oil, petrol, benzene etc. in
the near the water heater or the
exhaust vent.
Do not store or use petrol or other
ammable vapours and liquids in the
vicinity of this or any other appliance.
Prohibited
Do not place or use a spray can
near the water heater or the exhaust
vent.
Do not place the unit in an indoor
environment by means of adding walls
and ceiling (Do not enclose using
corrugated sheets, etc.)
Carbon monoxide poisoning or fire may
occur as a result.
Prohibited
Do not place combustibles such as
laundry, newspapers, oils etc. near
the heater.
Unit
Be sure
to do.
Check that the data label.
(left side of casing)
Ex. For Natural Gas (21ENB5N)
xx
xxxxxxxx
xx
xx xx
xx
Unit

Owner's Guide
5
Part: XXXXX Rev XX
Be sure
to do.
Contact Dux before using with
a solar heater.
Don’t
disassemble
the equipment.
Contact a qualied service
technician for any necessary
repairs, service or maintenance.
Don’t touch
with a wet
hand.
Electric
Shock.
Do not touch the power
cord with wet hands.
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Don’t
touch.
Prohibited
Prohibited
Earth
Be sure
to do.
Be sure
to do.
Be sure to electrically earth the
unit.
Do not turn off the water heater
while someone is bathing.
Do not cover the water heater, store
trash or debris near it, or in any way
block the ow of fresh air to the unit.
Do not install in locations where
excessive dust or debris will be
in the air.
Do not use condensate, discharged
from the drain pipe, for drinking or for
consumption by animals.
Do not touch the exhaust vent
during or immediately after
operation of the water heater.
Keep power cord free of dust.
Do not use the water heater for
other than hot water supply, shower
and bath.
To prevent burns or scalding, turn
off the power button and wait until
the equipment cools before per-
forming maintenance.
Do not use a broken or modied power cord.
Do not bind, bend or stretch power cords.
Do not scratch, modify, or subject
them to impact or force. If the supply
cord is damaged, it must be replaced
by the manufacturer, its service agent
or similarly qualied persons in order to
avoid a hazard.
Do not exchange a remote controler
cord without notice.
CAUTION

Owner's Guide
6Part: XXXXX Rev XX
CAUTION
Important Safety Information
Do not drink water that has been inside the
unit for an extended period of time. Do not
drink the rst use of hot water from the
unit in the morning.
Do not disassemble the remote controller.
Do not use benzene, oil or fat detergents
to clean the remote controller.
Do not splash water on the remote
controller. Do not expose the remote
controller to steam.
Do not locate the remote controller near stoves or
ovens, this may cause damage or failure.
Preventing damage from freezing ( p.22)
Damage can occur from frozen water within the
device and pipes even in warm environments.
Be sure to read below for appropriate measures.
Repairs for damage caused by freezing are not
covered by the warranty.
Do not get the remote controller wet.
ECB1D and ECB2D are water resistant,
too much water can cause damage.
ECM1D is not water resistant.
Do not install the equipment where the
exhaust will blow on walls or windows.
Treat hard, acidic or otherwise impure
supply water with approved methods to
ensure full warranty coverage.
Problems resulting from scale formation
are not covered by the warranty.
Do not run water through the unit when
unit is not on.
Power must be switched on at all times for
antifrost protection to work.
If it is snowing, check the air inlet, exhaust
gas vent and exhaust vent terminal for
blockage.
Do not use parts other than those specied
for this equipment.
Clean the lter on the water inlet as
frequently as required. The quality of your
local water will affect the frequency required.
Keep the area around the unit clean.
If boxes, weeds, cobwebs, cockroaches etc. are in
the vicinity of the unit, damage or fire can result.
When discharging hot water, make sure the unit is ON.
If water is run through the unit with the unit
OFF, water may condense inside the unit and cause
incomplete combustion or damage to the internal
electrical components.
This may cause deformation.

Owner's Guide
7
Part: XXXXX Rev XX
Contents
Important Safety Information....................................................................... 2
Contents ........................................................................................................ 7
General Parts
Main Unit .................................................................................................... 8
Names and Functions of Controllers
Main Controller (ECM1D) .......................................................................... 9
Bathroom Controller (ECB1D) .................................................................10
Bathroom 2 Controller (ECB2D) ..............................................................11
Initial Operation ........................................................................................... 12
Clock Adjustment ........................................................................................ 13
Setting and Using the Water Heater........................................................... 14
Controller Priority Function ........................................................................ 16
Muting the Remote Controller ....................................................................17
Bath Fill Function ........................................................................................ 18
Call Function ................................................................................................ 21
Frost Protection ........................................................................................... 22
Regular Maintenance................................................................................... 23
Troubleshooting .......................................................................................... 25
Follow-up Service ........................................................................................ 29
Specications .............................................................................................. 30
Manufacturer’s Warranty ............................................................................ 34

Owner's Guide
8Part: XXXXX Rev XX
General Parts
Main Unit
Outdoor Wall Mounted, Power ue Model
Flue Exhaust
Front Cover
Air Inlet
Gas Supply Valve
Water Supply Valve
Ex. 26ECB5N
Hot Water Pipe
External Weatherproof Power Point
Inlet water lter
(Inside Water Inlet) ( p.24)
* The above illustration shows an example of installation.
The exact installation configuration may be slightly different.
Drain Pipe - Condensing Model only
Discharges the condensate

Owner's Guide
9
Part: XXXXX Rev XX
Display
Bath Fill Volume Button
Display
Burner on Indicator
Bath Fill Temperature Indicator
Priority Indicator
Error Code Clock Bath Fill Volume setting
Bath Fill Temperature setting
Temperature setting
Setting Buttons
Operation Button
Bath Fill Button
Time Set Button
Names and Functions of Controllers
Main Controller (ECM1D) <Optional>
MAIN
ECM1D
What is actually displayed depends on how the water heater is set.
To set or lndicate Time
of day. ( p.13)
For setting the amount
of water that is delivered.
(p.18 -20)
When this indicator is lit,
the hot water temperature
can be set. (p.16)
A number will flash if
a failure occurs.
(p.28)
When Time Set button
is pushed, the clock is
displayed. (p.13)
When this indicator is lit,
bath fill temperature is
displayed.
(p.18 -20)
When burning, the
indicator is lit.
For setting the hot
water temperature
(p.14-15)
For other settings.
For turning the water
heater on or off.
To activate Bath Fill.
To set Bath Fill
temperature.
(p.18 -20)
* Before use, remove the protective sheet from the remote controller surface.
The illustration below shows the remote controller display.
What is actually displayed depends on how the water heater is set.
(p.18 - 20)
(Eg.: 40°C)
(Eg.: 40°C)

Owner's Guide
10 Part: XXXXX Rev XX
Display
Priority Button
Display
Burner on Indicator
Bath Fill Temperature Indicator
Priority Indicator
Error Code Bath Fill Volume setting
Bath Fill Temperature setting
Temperature setting
Setting Buttons
Operation Button
Bath Fill Button
Call Button
BATHROOM
ECB1D
Bathroom Controller (ECB1D) <Optional>
What is actually displayed depends on how the water heater is set.
To sound alarm at all
remote controls. (p.21)
To transfer control from
another remote.
(p.16)
When this indicator is lit,
the hot water temperature
can be set. (p.16)
A number will flash if
a failure occurs.
(p.28)
When this indicator is lit,
bath fill temperature is
displayed.
(p.18 -20)
When burning, the
indicator is lit.
For setting the hot
water temperature
(p.14 -15)
For other settings.
For turning the water
heater on or off.
To activate Bath Fill.
To set Bath Fill
temperature.
(p.18 -20)
* Before use, remove the protective sheet from the remote controller surface.
(p.18 - 20)
(Eg.: 40°C)
(Eg.: 40°C)
The illustration below shows the remote controller display.
What is actually displayed depends on how the water heater is set.

Owner's Guide
11
Part: XXXXX Rev XX
Temperature setting
Error Code
(Eg.: 40°C)
Priority Indicator
Burner on Indicator
Display
Display Operation Button
Setting Buttons
BATHROOM2
ECB2D
ON/OFF
Bathroom 2 Controller (ECB2D) <Optional>
What is actually displayed depends on how the water heater is set.
When this indicator is lit,
the hot water temperature
can be set. (p.16)
When burning, the
indicator is lit.
A number will flash if
a failure occurs.
(p.28)
For turning the water
heater on or off.
For setting the hot
Water temperature.
(p.14 -15)
* Before use, remove the protective sheet from the remote controller surface.
The illustration below shows the remote controller display.
What is actually displayed depends on how the water heater is set.

Owner's Guide
12 Part: XXXXX Rev XX
Initial Operation
Before the first use of your water heater, make the following preparations.
Follow steps 1 through 4
1
2
3
4
Open the water supply valve.
CLOSED OPEN
Open a hot water fixture to confirm that
water is available, and then close the
fixture again.
Hot water fixture
Open the gas supply valve.
Turn on the power.
Ex. 21ENB5N

Owner's Guide
13
Part: XXXXX Rev XX
MAIN
ECM1D
2
12 3
1, 3
Clock Adjustment
(Main Controller)
Note: Only the main controller has a clock
function.
Clock setting and the clock can be dis-
played regardless of “ON or OFF" of
the operation button.
(The illustration is in a state of "OFF".)
Press the Set
Time Button
(Until “0:00” is ashing)
Press the Set
Time Button
Adjust the clock
Increase
Decrease
The time changes in 1-minute increments
with each press on the button, and
then in 10-minute increments if the
button is kept pressed down.
The flashing changes to
constant illumination when the
clock has been set.
Flashing Flashing Flashing
Display the clock
Press the set time button.
The clock display will then return to the original screen display.
• The clock display will disappear if hot water is used or the temperature of the hot water is changed during
the clock display.
• If the Time set button is pushed when the hot water is being used or a high temperature (60°C or more) is set,
the clock is displayed for 10 seconds and will return to the original screen display after that.
• In the event of a power cut or after disconnecting the power supply, the clock on the display screen will
show 0:00 when the power is restored. In this case the clock will need to be reset.

Owner's Guide
14 Part: XXXXX Rev XX
1Press the Operation
Button
MAIN
ECM1D
2
1
(Main Controller) (Starting with the Operation Off)
Setting and Using the Water Heater
The temperature will be
displayed on the Remote
Controller.
ON
Previous set temperature
(Eg.: 40°C)
DANGER
High Temperature
To prevent scalding: Remote Controller Display
Hot Water Heater temperatures over 50°C can cause
severe burns instantly or death from scalding.
• Children, disabled and elderly are at the highest risk of being scalded.
Feel water temperature before bathing or showering.
Temperature limiting valves are available, ask licensed installer.
• When setting the unit to 60°C or more ( p.15), the temperature
display will flash for 10 seconds.
• Take caution when using the unit again after setting to 50°C
or higher. Always check the set temperature before use.
Flashing for 10 sec
ON

Owner's Guide
15
Part: XXXXX Rev XX
234
Set temperature.
( )
( )
Always check the
temperature setting
before use.
Hot
Cold
Check the indicator lights. ON OFF
Water temperature
Turn on hot
water.
Turn off the hot
water.
°C:The temperature settings below are examples. The temperature setting
necessary depends on the usage, the length of piping or seasons.
Bathroom and Bathroom 2 controller are these ranges.
[50 degree models: Main and Bathroom and Bathroom 2 controller are these ranges.]
37 38 39 40 41 42 43 44 45 46 47 48 50 55 60 75
Shower, hot water supply, etc. Hot water supply, etc.
*Initial factory setting is 40°C
High temperature
26ENA6N/L only
* For most residential applications, the recommended setting temperature is 50°C or less.
For applications that occasionally require a higher temperature setting, locate the remote controller
in a convenient location.

Owner's Guide
16 Part: XXXXX Rev XX
Hot water supplied from this appliance is delivered to the kitchen, bathroom, and shower, etc. at the
same temperature.
The water temperature can only be changed by one remote controller if a number of remote controllers
are installed.
Only the controller with the priority light illuminated will be able to adjust the temperature of the water
heater.
• The remote controller on which the operation button is turned “on” has priority.
• If the Bathroom or Bathroom controller2 has priority left ON, press OFF & ON any other controller to transfer
priority to that controller. This function cannot be changed while the appliance is producing hot water
(Except when hot water is operating).
Controller Priority Function
Priority
When the temperature cannot be adjusted, follow the procedure below. <Priority button>
(Temperature settings for example.)
Bathroom Controller Main Controller Bathroom 2 Controller
OFF
OFF
OFF
ON
ON
ON
Temperature cannot be adjusted Switch priority Temperature can be adjusted
Press the priority button
* Care must be taken as operation is interrupted.
* Care must be taken as operation is interrupted.
Turn off the
operation button.
Turn off the
operation button.
Turn on the operation
button once again.
Turn on the operation
button once again.
OFF ON

Owner's Guide
17
Part: XXXXX Rev XX
MAIN
ECM1D
Muting the Remote Controller
(Main Controller)
(Bathroom Controller)
(Bathroom 2 Controller)
BATHROOM2
ECB2D
ON/OFF
BATHROOM
ECB1D
• The bath fill and the call function alarm are not muted.
The remote controller will emit a sound
when any button is pushed. This sound
can be muted if it is desired.
* Initial factory setting is with sound
Hold the Operation Button
for ve seconds.
Muted Sound
1
1
1
1
No sound
after 5 sec.
Tone sounds
after 5 sec.
No sound
after 5 sec.
Tone sounds
after 5 sec.

Owner's Guide
18 Part: XXXXX Rev XX
MAIN
ECM1D BATHROOM
ECB1D
Bath Fill Function
(Main Controller)
Plug the bath drain.
The temperature will be displayed
on the remote control thermostat.
Previous set temperature
(Eg.:40°C)
Bath Fill temperature
(Eg.:42°C)
Flashingafter
10 sec.
Flashing for 10 sec.
Flashing for 10 sec.
(Starting with the operation off)
(Bathroom Controller)
1
2
4
3
1
2
4
3
Preparation Press the
Operation Button
Press the Bath
Fill Button
21
ON ON
ON
ON
ON

Owner's Guide
19
Part: XXXXX Rev XX
Filling Up the Bath
In order to run a warm bath, push the bath fill
button and open the hot water tap of the bath.
When the bath has reached the volume set
on the controller, an alarm sounds and the hot
water supply will stop automatically.
Once the bath fill is complete, please close
the tap as the water heater cannot operate
until this is done.
Water Temperature
( )
( )
°C:The temperatures settings below are only examples. The
temperature setting necessary will depend on the usage,
the length of piping or seasons.
37 38 39 40 41 42 43 44 45 46 47 48
Warm Warmer Hot
* Initial factory setting: 40°C
To set the Bath Fill Volume:
34 5
Set temperature.
Always check
temperature setting
before use
Adjust bath ll
volume setting.
Turn on hot
water.
Hot
Cold
Check the indicator lights.
Bath Fill temperature
Increase
Decrease
Press the Bath Fill button (the setting
will flash on the display) and adjust
with the setting buttons.
Choose the bath fill volume setting from the
following options: 40 - 80 (In 20 litre intervals),
120 - 200 (In 40 litre intervals), or 250 - 650
(In 50 litre intervals).
* Initial factory setting: 160 litre.
Bath fill volume setting will be flashing
(Eg. 200 litre).
* The level can only be adjusted while
the indicator is flashing.
* After 10 seconds, the remote
will again display the temperature.
* For Bathroom controller.
To alter the bath fill volume press the
priority button after the bath fill button.
On On

Owner's Guide
20 Part: XXXXX Rev XX
6
An alarm will sound for
10 seconds when the flow
reaches the set level.
And the hot water will stop automatically.
Turn off the hot
water when the
alarm sounds.
The alarm will sound when
the set level has been
reached. Stop the water.
* When using hot water at another hot water outlet, also
turn it off.
<When you turn off the hot water supply>
• Bath fill temperature indicator turns off. (within approx. 30
seconds).
<If you do not turn off the hot water supply>
The equipment automatically runs the water to check if the hot
water supply has been turned off.
<When approx. 10 minutes passes without turning off the
hot water supply the sound is played>
The following screen appears, so turn off all the hot water
supplies and then press the buth fill button.
* Do not open the hot water supply until the Bath fill temperature
indicator goes off.
The setting temperature becomes the bath fill temperature after the bath fill was used.
If the bath fill is being used to indicate when a bath is full:
• If any hot water is being used besides what is going into the bath, the alarm will sound before
the bath is full.
• If there was water in the bath before the fill began, the bath may overflow.
• If there was water in the bath before the fill began, the temperature in the bath after it is full
may be different from the temperature setting.