Dux ecosmart 200DHA20 Installation instructions

Heat Pump Water Heater
Specications and materials may change without notice.
Effective for Ecosmart® water heaters manufactured and sold after 1st October 2023.
Installation and Owner’s Manual
Model: 200DHA20, 200DHA20P,
300DHA20, 300DHA20P
H4128 Rev. A
For advice, repairs and service, call:
1300 365 115 (Australia)
0800 729 389 (New Zealand)
Carefully remove all packaging and
transit protection from the heater before
installation. Dispose of the packaging
responsibly using re-cycling facilities
where they exist.
Installation Details
Owner’s Information
Warranty
IMPORTANT INFORMATION
Failure to follow these instructions may affect the Warranty

Installation and Owner’s Manual – Ecosmart Heat Pump
H4128 Rev. A
i
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 CONTINUED
SAFETY OF THIS APPLIANCE IT
MUST BE INSTALLED, OPERATED
AND MAINTAINED IN ACCORDANCE
WITH 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 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 COMBUSTIBLE
MATERIAL NEAR THIS WATER HEATER.
DO NOT MODIFY THIS WATER HEATER.
DO NOT OPERATE THE WATER HEATER
WITH ANY PANELS OR COVERS
REMOVED.
DO NOT INSERT YOUR FINGER, A
STICK, OR OTHER OBJECTS INTO THE
AIR INLET & OUTLET GRILLS. THIS MAY
CAUSE INJURY, SINCE THE FAN INSIDE
ROTATES AT HIGH SPEEDS DURING
OPERATION.
WARNING – 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, 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 A
SOUND SIMILAR TO AIR ESCAPING.
RELIEF VALVE:
The Pressure & Temperature Relief (PTR)
Valve must be installed directly into the RP½”
(DN15) socket marked “RELIEF VALVE”.
The PTR Valve rating is 1,000 kPa and 10 kW.
The valve must not be tampered with or
removed. The water heater must not be
operated unless this valve is tted 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 tted to the PTR
Valve must be left open to the atmosphere.

Installation and Owner’s Manual – Ecosmart Heat Pump
ii
H4128 Rev. A
Important Safety Information
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
tted to the PTR Valve during heating cycles.
Continuous leakage of water from the PTR
Valve 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 on the thermostat indicates a
possibly dangerous situation. Do NOT reset
the overtemperature 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 xed wiring in
accordance with the Wiring Rules.
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.
Warning- Do not replace the heating
element with one of higher heating
capacity.
Excess wire is not to be looped close to the
thermostat or tank.
In addition to the PTR Valve, the water
heater is tted with a combination thermostat
and over-temperature energy cut-out.
These devices must not be tampered with
or removed. Replacement of these devices
must only be carried out by a licensed
tradesperson or the manufacturer.
The water heater must not be operated
unless these devices are tted 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.
Where the mains pressure can exceed or
uctuate beyond this pressure, a pressure
reducing valve must be tted in the cold
water inlet supply.
Instructions explaining how the water heater
can be drained can be found on page 6.

Installation and Owner’s Manual – Ecosmart Heat Pump
iii H4128 Rev. A
INSTALLATION REQUIREMENTS
General:
This water heater must be installed by a
licensed tradesperson, and in accordance
with:
• In Australia, the Plumbing Code of
Australia (PCA);
• 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); and
• 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
Veri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 certicate, showing that
the work complies with all the relevant
Standards. Only a licensed person will have
insurance protecting their workmanship.
Pool Heating:
This water heater must
not be used for pool
heating.
Location:
The water heater should not be installed
in small enclosed spaces. For efcient
operation, the water heater should be
located outdoors or in a space with a volume
of at least 200 cubic metres. See page iv for
Clearance requirements.
Ensure the compliance plate and associated
warnings are clearly visible.
The water heater must be accessible without
the use of a ladder or scaffold. Adequate
clearance must be available for service to the
electrical cover, refrigeration components,
controller, relief valve and sacricial anodes.
Avoid positioning the water heater near
bedrooms or neighbours’ bedrooms as the
water heater may operate during the night.
The water heater should be located as close
as possible to the most frequently used hot
water outlet.
Circulated Hot Water Systems:
This water heater should not be installed as
part of a circulated hot water ow and return
system.
If a circulated ow and return system is
required, Dux recommends that a backup
electric storage water heater is installed in
the recirculation line.
Please consult Dux After Sales and Service
for advice if required.
Important Safety Information

Installation and Owner’s Manual – Ecosmart Heat Pump
iv
H4128 Rev. A
Water Heater Support:
The water heater must be installed on a at,
solid supporting surface. The pipework must
not be used to support the water heater.
Where the water heater is subjected to wet
conditions, a plinth should be installed under
the water heater.
A properly drained safe tray must be installed
where property damage could occur from
water spillage. Refer to AS/NZS 3500.4 for
further information.
Clearances:
Allow at least 300 mm clearance above,
500mm clearance on the fan side, 300mm
clearance on the evaporator side and 50 mm
clearance at the back of the water heater.
If possible, allow 500 mm above the water
heater to provide clearance to change the
anodes through the top cover. Refer to
Specications on page 5.
Make sure there are no obstructions placed
around the water heater to ensure adequate
air ow.
See diagrams below.
Transport and Handling:
When moving the water heater, it must be
kept in a vertical orientation at all times.
Never tilt the water heater more than
45° from vertical.
Tilting beyond 45° will severely affect the
operation of the water heater and may
void the warranty on the refrigeration
components.
Important Safety Information
CLEARANCE (TOP)
MINIMUM 300
RECOMMENDED 500
CLEARANCE (BACK)
MINIMUM 50
RECOMMENDED 150
CLEARANCE (FAN SIDE)
MINIMUM 500
RECOMMENDED 1000
CLEARANCE
(EVAPORATOR SIDE)
MINIMUM 300
RECOMMENDED 500
A
B
C
E
D
RECOMMENDED 500
FOR SERVICE
198
947
1582
HEAT PUMP 200
197
1374
2007
663
621
HEAT PUMP 300
REV. REF# DESCRIPTION REVISED BY DATE
01 HPD472 PROVISIONAL DRAWING RJ 16-08-2022
DIMENSION HEAT PUMP 200 HEAT PUMP 300
A 200 200
B 950 1375
C 1580 2005
D 620 620
E 665 665
PART No:
1:15
1 of 1
SHEET No:
1
0.5
1
x
x.x
x.xx
x
x.x
LINEAR
ANGULAR
SCALE:
Copyright
FINISH:
MATERIAL:
UNLESS OTHERWISE SPECIFIED
TOLERANCE
DO NOT SCALE DRAWING
DIMENSIONS IN MILLIMETRES
ANGLES IN DEGREES
IF IN DOUBT ASK
APPROVED:
CHECKED:
DRAWN:
Telephone [phone]
Facsimile (61 2) 4868 0257
ABN: 19 077 879 844
Lackey Rd
Moss Vale NSW 2577
Australia
DUX MANUFACTURING LTD
REVISION:
DRAWING TITLE:
DRAWING No:
A3
- 031303
GA - HPGEN2 - 200
Rony John
16/08/2022
MODEL No:
©
1
1
TOLERANCE
Rony John
16/08/2022

Installation and Owner’s Manual – Ecosmart Heat Pump
2H4128 Rev. A
Contents
Important Safety Information i
Installation Requirements iii
Plumbing Connections 3
Specications 5
Filling and Draining 6
Electrical Connection 7
Wiring Diagram 8
Commissioning 9
Principle of Operation 10
Heat Pump Contol Options 11
Dux Heat Pump App 12
System Maintenance 13
Considering a Service Call? 15
Warranty 17
© Dux Manufacturing Limited 2024. All rights reserved.

Installation and Owner’s Manual – Ecosmart Heat Pump
3
H4128 Rev. A
Water Supply:
This water heater has been manufactured to
suit the water conditions of most Australian and
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 600 mg/L, it is
possible the magnesium alloy anode (supplied
in standard water heaters) may become over-
reactive. To alleviate this, a hard water model is
recommended, or the magnesium alloy anode
should be replaced with an aluminium alloy
anode. Aluminium 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 tted.
Warranty does not apply if the Saturation Index
(LSI) is less than -1.0 or greater than +0.8. LSI
gures stated above are calculated with a water
temperature of 80°C. 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 tted between the water supply
main and a RP¾”(DN20) socket marked
“INLET” at the bottom of the water heater. See
the diagram below for details.
All ttings must be approved by the relevant
Authority. Plastic pipes or ttings shall not be
used between the isolating valve and the inlet.
Plumbing Connections
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.
Cold Water Connection Diagram:

Installation and Owner’s Manual – Ecosmart Heat Pump
4H4128 Rev. A
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
uctuate beyond this pressure, a pressure
reducing valve must be tted 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
tted on the cold water supply line between the
non-return valve and the water heater.
Hot Water Connection:
The hot water pipe can be connected to the
RP¾”(DN20) socket marked “OUTLET” at the
top of the water heater.
It is recommended that all hot water pipes are
insulated. Hot water pipes installed outdoors
should be insulated with UV stabilised insulation.
Plastic pipes or ttings shall not be used within
1 metre 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 tted
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.
We recommend using a high performance
tempering valve.
Relief Valve:
The Pressure & Temperature Relief (PTR) Valve
is supplied inside the electrical cover of the
water heater. Instructions on how to remove the
electrical cover can be found on page 7. Discard
the packaging containing the PTR valve.
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 directly into the RP½”(DN15) socket
marked “RELIEF VALVE” at the top of the water
heater. Ensure that a sealing material is applied
to the PTR Valve to prevent water leaks.
The PTR Valve and its drain line must not be
sealed or blocked.
The PTR Valve is not intended to enable
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.
It is normal for the valve to leak a small amount
of water during heating cycles.
Relief Valve Drain Line:
The drain line from the PTR Valve must be
made of copper and run in accordance with
the requirements of AS/NZS 3500.4. It must be
installed in a continuously downward direction in
a frost free environment.
A separate drain line must be run for this valve.
The drain line must not be directly connected to
any other copper piping.
Condensate Drain Line:
A condensate drain point is located on the side
of the water heater near the hot water outlet.
A drain line must be connected to this point
and run so that it discharges clear of the water
heater.
The Condensate Drain Line must not be
connected to the Relief Valve Drain Line although
they may both discharge to the same point.
Plumbing Connections

Installation and Owner’s Manual – Ecosmart Heat Pump
5
H4128 Rev. A
Specifications
Specifications
Model 200DHA20 200DHA20P 300DHA20 300DHA20P
Storage Capacity (L) 202.5 202.5 287 287
Rated Energy Input (kW) 2.5 1.9 2.5 1.9
Max Current (A) 12 10 12 10
Electric Element Rating (W) 1800 1200 1800 1200
Refrigerant Type / Mass (g) R134a / 670 R134a / 670
Net Weight (kg) 90 125
Max. Refrigerant Circuit Pressure (kPa) 2600
Relief Valve Rating 1000kPa/10kW
Nominal Dimensions (mm)
Model 200DHA20/20P 300DHA20/20P
Inlet Height (A) 200 200
Outlet Height (B) 950 1375
Total Height (C) 1580 2005
Total Diameter (D) 620 620
Total Depth including Cover (E) 665 665
A
B
C
HEAT PUMP 200
A
B
C
E
HEAT PUMP 300
D
A
B
C
HEAT PUMP 200
A
B
C
E
HEAT PUMP 300
D
A
B
C
HEAT PUMP 200
A
B
C
E
HEAT PUMP 300
D

Installation and Owner’s Manual – Ecosmart Heat Pump
6H4128 Rev. A
Filling the Water Heater:
The water heater must be lled with water
before turning on the electrical supply.
1. Open all hot water taps.
2. Open the isolating valve at the cold
water inlet slowly and allow the water
heater to ll until water ows through the
system.
3. Close each hot water tap after the air is
expelled from its line.
4. Open the Pressure & Temperature Relief
Valve for approximately 10 seconds
by lifting the easing lever on the valve.
Conrm water is relieved to waste
through the relief valve drain pipe.
5. Lower the lever gently and check it
closes correctly.
Draining the Water Heater:
1. Turn off the electricity supply to the
water heater.
2. Turn off the cold water supply to the
water heater at the isolating valve.
3. Gently operate the easing lever on the
Pressure & Temperature Relief (PTR)
Valve to release the pressure in the
water heater.
4. Disconnect the cold water inlet union
and attach a drain hose to the water
heater.
5. Gently operate the easing lever on the
PTR Valve to let air into the water heater
and allow water to escape through the
hose.
Filling and Draining

Installation and Owner’s Manual – Ecosmart Heat Pump
7
H4128 Rev. A
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.
Connection of the electrical wiring must only be
carried out by a licensed tradesperson.
The water heater has been designed for
connection to a continuous supply tariff or
a suitable extended controlled load tariff
(such as Tariff 33 in QLD, or Off-Peak 2 in
NSW). Contact Dux After Sales and Service if
required.
For hardwired models, a set of terminals and a
conduit entry is provided to make permanent
connection to xed wiring.
Connections are to be made at the terminal
block under the water heater electrical cover. A
means for disconnection must be incorporated
in the xed wiring in accordance with the Wiring
Rules.
Plug-in models are supplied with a power cord
to plug into a 10A GPO.
It is highly recommended to add means of cable
protection to the power cord to offer protection
from gardening equipments, vermin etc.
Removing the Electrical Cover:
Before removing the electrical cover, ensure the
electrical power supply is safely isolated.
The electrical cover is removed by undoing the
screws attaching the bottom cover and sliding
the cover downwards to disengage the top
edge.
Connections (For hardwired models):
The conduit entry is a pre-punched hole
designed to accept a 20 mm conduit gland. It
is located adjacent to the terminal block.
To prevent damage to the wiring, the conduit
entry must be tted with a gland prior to
feeding the wiring through the hole. Ensure the
conduit entry is sealed correctly.
Connect the active and neutral wires to the
terminal block and the earth wire to the earth
tab (located on the right hand side).
Replacing the Electrical Cover:
1. Ensure the terminal block mounting plate
is horizontal.
2. Slide the cover up, ensuring the top edge
engages under the case.
3. Swing the cover down until the bottom
edge contacts the case. Ensure the
terminal block mounting plate is below the
pins located inside the cover.
4. Ret and tighten both screws in the cover.
Ensure the water heater is lled with
water before turning on the electricity
supply.
Warning- Do not replace the heating
element with one of higher heating
capacity.

Installation and Owner’s Manual – Ecosmart Heat Pump
8H4128 Rev. A
Wiring Diagram

Installation and Owner’s Manual – Ecosmart Heat Pump
9
H4128 Rev. A
Initial Operation:
1. Completely ll the water heater with
water before turning on the electrical
supply. This can be done by opening
all hot water outlets in the house and
opening the inlet valves to the heater.
2. Turn on the electrical supply.
3. The light above “AUTO” on the
controller will light up.
4. The water heater will start heating within
30 seconds of turning ON the electrical
supply.
5. You may choose to press the BOOST
button on the controller to accelerate
the heating for the rst heating cycle.
Depending on the ambient conditions,
both the heat pump and the element will
work to heat the water until the tank is
hot. The water heater will return back
to the default AUTO mode after one
BOOST cycle.
6. To access more functions, use the Dux
HP App available on Android and iOS.
Commissioning

Installation and Owner’s Manual – Ecosmart Heat Pump
10 H4128 Rev. A
Principle of Operation:
A heat pump storage water heater works in a
similar way to a reverse cycle air conditioner.
Heat is extracted from the outside air and
transferred to the water in the storage tank. It
does not need to be located in direct sunlight
to work.
A heat pump storage water heater can
efciently produce hot water on cloudy and
overcast days as well as during the night.
The length of time that the water heater will
operate each day will vary depending on
the amount of hot water being used and the
ambient temperature and humidity.
Generally, the water heater will run longer in
winter and at night when the air is cooler due
to less heat energy in the air to absorb.
The controller monitors the water
temperature and the ambient air
temperature. Providing the ambient
conditions are suitable, when the water
temperature drops, the controller starts the
heat pump module to begin heating the
water.
Freeze Protection
The water heater is equipped with an active-
defrost function which automatically melts
ice formed on the evaporator coil during cold
ambient conditions.
The water heater also has an anti-freeze
function which prevents the water in the tank
from icing up during vacation mode.
Damage caused by freezing is not covered
by the warranty when the water heater is not
connected to power.
WARNING: Power must be available to the
water heater at all times for the anti-freeze
function to work.
Principle of Operation

Installation and Owner’s Manual – Ecosmart Heat Pump
11
H4128 Rev. A
The water heater can be programmed to run in
various modes based on the requirements of
the user. The following are the various modes
and features available for the water heater.
Some of these modes are only available when
using the Dux HP App.
MODES
Auto
This is the default mode for the water heater
and will heat the tank to 60C. In this mode,
the heat pump system will be used to heat
the water when the ambient temperature is
within –6ºC to 45C. Outside this ambient
temperature range, the backup heating
element will be used to heat the water.
Eco
In this mode, only the heat pump system
can operate to heat the water. The
backup heating element will not operate
to heat water and may only be used to
prevent freezing of water in the tank. It is
recommended to use this mode only when
the ambient temperature is expected to be
within –6ºC to 45ºC.
Boost
In this mode, both the heating element and
heat pump system will operate together to
heat the water. This mode can be used to
reduce the heating time of the water heater.
The BOOST function will only operate for one
heating cycle after which the water heater
will return back to the previous mode.
Holiday
This mode can be used if the water heater is
not expected to be used for a long duration.
The water temperature in the tank is kept
above 10ºC to avoid any risk of freezing.
Scheduling
The water heater can be scheduled to
operate only at particular times of the day
using the “Weekly programming” option
in the Dux HP App. Please note that
scheduling the water heater to run only at
particular times of the day increases the risk
of running out of hot water.
If you run out, you will need to schedule
additional hours in which the water heater
can heat. As the heating rate is slower in
cold ambient conditions, you are more likely
to experience this during the winter months.
TEMPERATURE SETTINGS
The maximum recommended thermostat
setting for the water heater is 60ºC.
The thermostat settings for the heating
element is factory set and must not be
changed.
Adjustment of the thermostat for the electric
heating element may lead to incorrect
operation of the heat pump system.
Heat Pump Control Options

Installation and Owner’s Manual – Ecosmart Heat Pump
12 H4128 Rev. A
The Dux HP App gives you more control over
the operation of the water heater.
Easily program your water heater to run in
various modes based on the hot water needs.
The Dux HP App can enable scheduling of
the heat pump to operate on certain days and
times.
This provides additional exibility to boost your
hot water output.
See page 11 for modes.
The App can be downloaded from Google
P l a y S t o r e o r A p p l e A p p S t o r e ; o r v i s i t
www.dux.com.au/duxhpapp to download or
scan the QR code below.
Dux HP Smartphone App

Installation and Owner’s Manual – Ecosmart Heat Pump
13
H4128 Rev. A
Regular servicing will help to extend the life
of the water heater, and keep it operating
safely and efciently.
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 17 of this
manual.
Six Month Service:
This service may be carried out by the
owner.
1. Stand clear of the Pressure &
Temperature Relief (PTR) Valve drain
pipe outlet.
2. Open the PTR Valve for approximately
10 seconds by lifting the easing lever on
the valve. Conrm water discharges to
waste through the drain pipe.
3. Lower the easing lever gently and check
it closes correctly.
4. Repeat the above process for the
expansion control valve (if installed).
5. Check that the grill on top if the water
heater and the louvres are free of debris
or other obstructions.
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. We recommend your
local Dux Service Agent.
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 both anodes.
• Inspect and ush the expansion control
valve (if installed).
• Clean any debris or residue from the
condensate gutter and conrm that the
condensate drain line is clear.
• Clean any dust or build up from the
evaporator and louvres.
• Clean the fan blades and grill.
Drain and ush the water heater.
Replacement parts are available from your
local Dux supplier.
System Maintenance

Installation and Owner’s Manual – Ecosmart Heat Pump
14 H4128 Rev. A
Anode Replacement:
The water heater is equipped with two anode
rods.
Follow these steps to replace the anode rods;
1. Ensure that any electrical supply to the
water heater is disconnected.
2. Close the isolating valve on the cold-
water inlet and release any pressure in
the water heater by lifting the lever on the
PTR valve.
3. Remove the front cover holding the
controller, by removing the screws holding
it against the case and pulling it down
while simultaneously lifting the bottom of
the cover away from the heater. Leave
it hanging. Please be careful not to
disconnect the wiring connections.
4. Remove the grills on both sides by
removing the 2 screws on the top of
each grill and pulling the grill out while
simultaneously lifting it to disengage the
bottom tabs.
5. Remove the 6 screws (3 on each side)
holding the top enclosure and slide it up
to disengage from the evaporator coil.
6. Remove the 2 anodes using a 1-1/16”
socket.
7. Install the new anodes and tighten.
8. Open the cold-water isolating valve and
ensure that there is no water leak from the
anode connection.
9. Re-install the top enclosure. Ensure that
wires are not pinched when doing so.
Ensure that the ambient sensor is not
dislodged from the top enclosure.
10. Re-install the grills.
11. Re-install the front cover. Ensure that
wires are not pinched when doing so.
12. Turn On the electricity supply to the water
heater.
System Maintenance

Installation and Owner’s Manual – Ecosmart Heat Pump
15
H4128 Rev. A
Please review this section. Although there
are no user serviceable components in the
water heater, the information contained in
this section may enable you to avoid the
cost of a service call.
Please do not remove any covers or
attempt to make any adjustments.
Water Discharge from Condensation
Drain Line:
Water may be expected to drain from
the Condensate Drain Line when the
water heater is operating. This is similar
to the condensation produced by an air
conditioner. The amount of condensation
produced will depend on ambient conditions
such as temperature and humidity.
No Hot Water:
Ensure the power supply circuit breaker
has not “tripped”. If the water heater is
connected to a controlled load tariff, ensure
this is operating correctly.
Error Detection using Dux HP App:
Check the Dux HP App to ensure it is in
an appropriate heating mode, and / or for
any indication of errors. The Dux HP App
will indicate an error if the heat pump is
continuously in operation for more than
24 hours. It will also indicate other errors
like sensor failure.
Considering a Service Call?

Installation and Owner’s Manual – Ecosmart Heat Pump
16 H4128 Rev. A
High Energy Bills or Insufcient Hot
Water:
• Often the hot water usage of showers,
washing machines and dishwashers
can be under estimated. Review these
appliances to determine if the daily
usage is greater than the capability of
the water heater.
• If necessary check the shower ow
rates with a bucket, measuring the
amount of water used over a period of
time. If it is not possible to adjust water
usage patterns, an inexpensive ow
control valve can easily be tted to the
shower outlet.
• Is the water heater the correct size for
the requirements? Sizing details are
available from your Dux supplier.
• Check that the grills on the sides of the
water heater are free of debris or other
obstructions.
• The water heater may take longer to
reheat during the night as the air is
usually cooler. It is possible that the
water heater may not fully recover
from a period of heavy usage during
the previous day. Consider using the
BOOST mode to reheat the water faster.
• 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 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
Pressure & 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 reviewing the information
contained in this section, the problem
has not been identied, please contact
Dux After Sales and Service.
Considering a Service Call?