Dux D2FHG3000C airoheat User manual

Heat Pump Water Heater
Specications and materials may change without notice.
Effective for Airoheat® water heaters manufactured and sold after 1st June 2006.
Owner’s Manual
Model: D2FHG3000C
H3025 10153 Rev. H
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

Owner’s Manual – Airoheat®
H3025 10153 Rev. H
Welcome To Dux Hot Water 1
Installation Details 2
Plumbing Connections 5
Electrical Connection 8
Installation Checklist 10
Commissioning The System 11
Operational Diagrams 12
Commissioning Checklist 13
Owner’s Instructions 14
Troubleshooting 17
System Maintenance 19
Safety Information 20
Service Information 21
Warranty 22
Other Information 25
Contents
© Dux Manufacturing Limited 2012. All rights reserved.

Owner’s Manual – Airoheat®
1
H3025 10153 Rev. H
Welcome To Dux Hot Water
Your decision to purchase a Dux Hot
Water system will reward you for many
years to come.
Since 1915, the Dux range has seen
continuous research and development,
resulting in many breakthroughs in the
efciency, reliability and longevity of hot
water systems.
Dux 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.
To be upfront about it, we want Dux to
be your brand of choice. So you can
depend on us to provide more than just
a hot water system.
You can rely on Dux products and
choose them with condence. We’ll
make sure you have the information, the
quality and the innovation you’re looking
for, including the latest energy-saving
alternatives. If you should ever have a
problem – and we’ll bet you won’t –
you’ll nd that we’re easy to get hold of,
friendly to talk to and quick to act. Our
service is all about providing anything
you need as soon as you need it.
Go with Dux and you’ll have a
dependable, economical, efcient hot
water system designed to perform well,
year after year. And that’s a promise.

Owner’s Manual – Airoheat®
2H3025 10153 Rev. H
Installation Details
This water heater must be installed
by a licensed tradesperson, and in
accordance with:
• AS/NZS3500.4.2 “National
Plumbing and Drainage Code Hot
Water Supply Systems – Acceptable
Solutions”.
• AS/NZS3000.
• Local authority regulations.
• Outside Australia and New Zealand,
please refer to local plumbing and
building codes and 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 certicate, showing
that the work complies with all the
relevant Standards and only a licensed
person will have insurance protecting
their workmanship for 6 years.
Note: This water heater and heat pump
components are not suitable for pool
heating.
All warranty is voided if the unit is laid
on its side for storage or transport. It
must be stored and transported in a
near vertical position at all times, with
no exceptions.
This water heater is designed for direct
connection to water supply pressures of
no greater than:
250 Litre Model – 800kPa
Where the mains pressure can exceed
or uctuate beyond the pressure
shown above, a pressure limiting
device (complying with AS1357) must
be tted in the cold water inlet supply.
This device must be installed after
the isolating valve and set below the
pressure shown above. Note during
periods of lower demand, water
pressure may increase.
Caution: This water heater delivers
hot water at temperatures exceeding
50°C. Refer to AS/NZS3500 and local
regulations regarding the need for
additional temperature control of hot
water delivery.
Safety
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.
Children and animals should be
supervised to ensure that they do not
interfere with the appliance.

Owner’s Manual – Airoheat®
3
H3025 10153 Rev. H
Installation Details
Location
The water heater must be installed
outdoors.
The water heater should be located
as close as possible to the most
frequently used hot water outlet.
Ensure that the data plate is clearly
visible and provide adequate access
for service to the element, thermostat,
relief valve and anode.
Note: All models are equipped with 2
sacricial anodes, accessible through
the top cover. Allow 50% of the height
of the water heater for clearance above
to replace the anodes.
The water heater has a plastic base
which is resistant to water damage, but
it is recommended that a concrete plinth
be installed under the water heater
to protect the heater when subjected
to wet conditions and to allow free
circulation of air. A properly drained
overow tray must be used where
property damage could occur from
water spillage. (See AS/NZS3500.4.2 for
further details.)
Note: The warranty does not cover
consequential damage due to leakage
of the water heater.
Preferred Location
If possible, the location selected for the
heat pump should be on the warm side
of the home.
The selected location must have free
ambient air ow to prevent cooler
discharged air being drawn back into
the heat pump.
Heat Pump
P
r
e
f
e
r
r
e
d
i
n
s
t
a
l
l
a
t
i
o
n
p
o
s
i
t
i
o
n
Allow sufcient clear space so as not
to impede this air ow. Allow 700 mm
clearance above the unit and 150mm
clearance to either side of the unit as a
general rule.
700mm
150mm
150mm

Owner’s Manual – Airoheat®
4H3025 10153 Rev. H
Installation Details
Noise Considerations
The selected location must consider
noise impact on living areas, especially
bedrooms, inside the house. Although
the running noise level is very low (51
dB(A)) it can be expected that the heat
pump will run during the night.
The installer can assist in choosing the
appropriate location for the unit.
Air Flow
Ensure the unit is placed in an area were
debris such as leaves and paper etc, will
not collect and block the air outlet on
the top of the unit.
Important: Do not put any objects on
top of the unit!
Transportation
Ensure the unit is always stored and
transported in an upright position.
Note: All warranty is voided if the unit is
laid on its side for storage or transport.
It must be stored and transported in a
near vertical position at all times. There
are no exceptions.
No more than 45˚
from vertical

Owner’s Manual – Airoheat®
5
H3025 10153 Rev. H
Plumbing Connections
A
B
635
Storage Tank Installation
Install and connect the storage tank to
the household water reticulation system
as per local plumbing regulations and
codes.
Install a condensation drain line in a
continuous fall away from the heat
pump to a safe and legal point of
discharge. Usually this would be a
garden bed or similar location.
Installation Dimensions
Table (mm) – 250 Litre
Tank Height (A) 1756
Tank Diameter 632
Height (from base of heater)
Hot Water Outlets (B) 1211
Cold Water Inlets 195
Minimum louvre clearances
Sides 150
Top 700
All measurements approximate only.
Specifications and material are subject to change
without notice.
Cold Water Connection
An approved isolating valve, non-
return valve, line strainer (optional but
recommended), and union must be
tted between the supply main and the
RP¾/20 socket in the water heater.
All ttings must be approved by the
relevant installation Authority.

Owner’s Manual – Airoheat®
6H3025 10153 Rev. H
Plumbing Connections
Note for S.A. and W.A.: It is a state
requirement that a pressure relief valve
be tted on the cold water supply line
between the non-return valve and the
water heater.
Hot Water Connection
The hot water line should be connected
to the RP¾/20 socket as shown on
the Installation diagram. For the most
economical operation of the water
heater, it is recommended that all hot
water lines are insulated with high
temperature, UV resistant 13mm
closed cell insulation. Please check
local regulations regarding the use of
hot water supply pipe work that are not
made of copper.
Pressure & Temperature Relief
Valve
The Pressure & Temperature Relief Valve
is supplied loose with the water heater.
The valve rating is:
250L Model – 1000kPa
The relief valve must be installed directly
into the top socket marked “RELIEF
VALVE”. The drain line from this valve must
run in a continuously downward direction
with the discharge end left permanently
open to atmosphere. The Pressure &
Temperature Relief Valve supplied with
the water heater is not intended to
enable connection of the water heater to
supplementary energy sources such as
solar panels or slow combustion stoves
(refer AS/NZS 3500.4.2 for guidance on
these types of installations)
Warning: A separate drain line must be
run for this relief valve. It is not permitted
to couple drain lines from relief valves
into a single common drain line.
Water Quality
Your water heater has been
manufactured to suit all water conditions
in “All Water Areas” present in Australia.
Please note that harsh water supplies
can have a detrimental effect on a water
heater and its life expectancy. If you are
unsure about your water quality, you can
obtain information from your local water
supply authority.
Water can also contain material known
to create lime scale where lime scale
can build up and block safety ttings.
One measure of this water quality is
known as the saturation index, if the
saturation index is greater than 0.40
and therefore subject to lime scale an
expansion control valve should be tted
to the unit.

Owner’s Manual – Airoheat®
7
H3025 10153 Rev. H
Plumbing Connections
Condensation Drain
All heat pump water heaters will create
condensation from the evaporator
coil. The more humid the air, the more
condensation it will create.
The evaporator coil is located at the top
of the unit, conforming to the outside of
the tank. When condensate is created,
it runs into the “Condensate Tray” which
sits on top of the storage tank. This
then runs out through the “Condensate
Drain” which is a feature of the tray. A
plastic drain pipe is attached to this
drain allowing easy access for the
plumber to attach the condensate drain
line away from the heater. The louvre
now incorporates a condensate drain
cover, to offer protection to the drain.
Drain pipe
Filling The System With Water
Once the system plumbing is completed
for the household and the unit has also
been connected, the tank can be lled
with water and pressurised.
Caution: The water heater must be
lled with water before turning on the
electricity supply.
Caution: If the water heater is left in
an operating condition and unused
for two weeks or more, a quantity of
hydrogen (which is highly ammable)
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,
no open ame or any other electrical
appliance operating nearby. If hydrogen
is discharged through the tap it will
probably make an unusual sound similar
to that of air escaping.

Owner’s Manual – Airoheat®
8H3025 10153 Rev. H
Electrical Connection
Electrical Connection
The unit is designed for connection to
- CONTINUOUS TARIFF, single phase
240 volt AC supply.
- Tariff 33 (QLD only), single phase 240
volt AC supply.
The electrical connection must comply
with local supply authority regulations
and AS3000.
The unit is rated at 10 amps (2 core and
earth) so the power mains supplying
the unit must have a 10 amp minimum
double pole circuit breaker tted.
For the Electrician the access cover
may be removed by undoing the two
screws on the cover and sliding the
cover downward to disengage it from
the case.
Note: The water heater is tted with
an electronic temperature control and
an over-temperature energy cut-out.
Under no circumstances should the
water heater be operated without
both these devices being in the circuit.
Replacement must be carried out by a
qualied electrician or the manufacturer.
Danger: The operation of the thermal
cut-out indicates a possibly dangerous
situation. Do NOT reset the thermal
cutout until the water heater has been
serviced by a qualied person.
Caution: Water heater must be lled
with water before turning on the
electricity supply.

Owner’s Manual – Airoheat®
9
H3025 10153 Rev. H
Electrical Connection
Hotlogic Operational Codes
Power Status
Green light
(Power)
Red light
(Status)
Power Status
Power LED
(Green)
Status LED
(Red)
Explanation
Alternating Power on initialisation (LEDs blink alternately)
On Off Power on
On On Fan on (compressor on/off)
Flashing Off Ambient sensor error (possible tank sensor error)
Off Flashing Tank sensor error
Flashing Flashing Over Pressure Switch tripped

Owner’s Manual – Airoheat®
10 H3025 10153 Rev. H
Installation Checklist
1. Always transport the unit in the
upright position, if you lay it on its
side the refrigeration system may be
compromised and the system may
fail.
2. Avoid installing the unit near a
bedroom window.
3. The unit produces water
condensation so make sure the
unit is installed on a at surface and
that a drain line is installed from
the condensation drain port so as
to conduct the water to a suitable
drainage point.
4. Tempering Valves are a requirement
– ensure they are commissioned
correctly. Incorrect commissioning
can lead to a lack of hot water
delivery. The use of a Reliance
brand tempering valve is
recommended.
5. It is recommended that all hot
water lines are insulated with high
temperature, UV resistant 13mm
closed cell insulation.
6. Ensure there is no obstruction on
top of the unit that will block the air
outlet.
7. When the system is turned on,
check the Hotlogic (inside top cover
you can access from top of unit)
status lights to help you determine
operational status.
If it is not displaying the green
power LED, refer to the table of
Hotlogic Operational Codes on
page 9 to determine the best
course of action.
8. The unit is designed for connection
to:
- CONTINUOUS TARIFF, single
phase 240 volt AC supply.
- Tariff 33 (QLD only), single phase
240 volt AC supply.

Owner’s Manual – Airoheat®
11
H3025 10153 Rev. H
Commissioning The System
When both the plumbing and electrical
connections have been completed, the
system is ready to run.
Before applying power to the system,
ensure that the system is full of water
and pressurised.
Turn on the power supply. The Hotlogic
control system will then check the unit’s
operating parameters. If conditions are
suitable and there is enough energy
available in the surrounding air, the
fan and compressor will turn on. The
unit is self regulating so there are no
internal adjustments to be made during
commissioning.
There will be a delay of approximately 8
seconds from the time the main power
is switched on before the compressor
and fan begin operating.
Conditioning Cycle
When the unit is operated for the rst
time, it runs through what is known
as a conditioning cycle. Once this has
occurred, it is important to conduct a
draw off of hot water, and allow the unit to
re-heat prior to testing water temperature.
Do the following:
1. After lling the tank with water, allow
time for the initial heat up cycle.
2. Once its rst heat up cycle is
complete, empty approximately
60 litres of hot water from the tank
through the PTR valve outlet.
3. Then allow the water in the tank to
re-heat.
4. Once the re-heat cycle is complete,
measure the water temperature at
the PTR outlet again.
5. The temperature will be
approximately 60º C.
If for any reason the unit does not start,
the water is cold and the Hotlogic unit
is not displaying any LED lights, an
electrician should test that power is
available to the heat pump.
Note: There are no installer serviceable
parts within the heat pump module.

Owner’s Manual – Airoheat®
12 H3025 10153 Rev. H
Operational Diagrams
Refrigeration View
Cut-through View
Main Component View

Owner’s Manual – Airoheat®
13
H3025 10153 Rev. H
Commissioning Checklist
1. The unit produces water
condensation, so make sure the
unit is installed on a at surface,
and ensure you install a condensate
drain from the condensate drain
port down the side of the water
heater.
2. Tempering Valves are a
requirement – ensure they are
commissioned correctly. Incorrect
commissioning can lead to a lack
of hot water delivery.
3. Make sure the all copper pipes are
lagged with high temperature closed
cell 13mm minimum insulation.
4. Ensure there is no obstruction on
top of the unit that will block the air
outlet.
5. When the system is turned on,
check that the Hotlogic unit (inside
top cover you can access from
top of unit) is displaying the green
power LED.
If it is not displaying the green
power LED, refer to the table of
Hotlogic Operational Codes on
page 9 to determine the best
course of action.

Owner’s Manual – Airoheat®
14 H3025 10153 Rev. H
Owner’s Instructions
Safety
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.
Children and animals should be
supervised to ensure that they do not
interfere with the appliance.
How Does The Heat Pump
Module Work?
A heat pump uses complex
thermodynamic principles to extract
energy from ambient air and transfer this
energy to water that is in contact with
the unit’s immersed heat exchanger.
The heat pump’s operational principles
are similar to those used in a normal
domestic refrigerator, except in reverse.
In a refrigerator, heat energy is drawn
from inside the refrigerator (making things
cold), concentrated by the compressor
then dissipated to the atmosphere via the
condenser coil located on the back of the
refrigerator cabinet.
In a heat pump system, outside air
is drawn into the unit and across an
evaporator coil by a fan. The evaporator
coil captures the energy in the air and
transfers that to cold liquid refrigerant,
contained inside the evaporator, causing
the refrigerant to increase in temperature
and evaporate into a warm gas.
The warm gas on exiting the evaporator
passes into a compressor where
compression causes the temperature of
the gas to increase further, becoming a
superheated (hot) gas.
The superheated gas is pumped from
the compressor to a water immersed
condenser coil, where it gives up its
heat energy to the water. When the
superheated gas gives up energy, it
condenses back to a liquid, and on
exiting the condenser coil, it passes
through an expansion control valve (TX
valve).
The TX valve acts as an automatically
adjusting tap that controls the amount of
liquid refrigerant that is allowed to pass,
once more, into the evaporator. This
is necessary to constantly match the
amount of liquid entering the evaporator
to the available energy in the air passing
through the evaporator so that the entire
liquid refrigerant that enters evaporates
and exits as a gas only.
How Do I Operate The System?
The operation of your water heater is
fully automatic, so you only need to
connect the water and electricity supply
and then turn on the electricity.
The heat pump module is electrically
connected to the storage tank and
will start automatically when the water
temperature in the storage tank falls
below 55°C and continue to run until the
water temperature of the complete tank

Owner’s Manual – Airoheat®
15
H3025 10153 Rev. H
Owner’s Instructions
has been increased to 60°C or slightly
above. To condition the unit properly
allow the heat pump to go through one
heat up cycle, before use, in that case
allow 24 hours before using the hot water.
How Long Will The Heat Pump Run
Each Day?
The length of time that the unit will run
each day will vary dependent upon the
amount of hot water being used by the
household and the average outdoor
ambient temperature and humidity.
Generally the unit will run longer in
winter and at night when the outside air
temperature contains less energy.
What Is Subzero
(De-icing Function)?
During colder temperatures (below 0°C),
and dependant on the level of humidity,
ice can begin to form on the evaporator
coil, which has the potential to affect the
system’s performance.
Operating through the patented Hotlogic
controller, the system instinctively
determines when conditions conducive
to icing exist. At this time the de-icing
process commences, removing ice from
the evaporator and allowing the unit to
continue to heat water.
The de-icing cycle interrupts the ow of
heated refrigerant, whilst still allowing
the fan to run, continuing to draw air
through the louvres. It is this airow
which de-ices the evaporator. Once
de-icing has occurred the system allows
the refrigerant to ow, and heating
continues.
Why Is There Condensation Com-
ing From The Unit?
Condensation production is normal
for all devices that use refrigeration
principles. Air conditioners are a good
example of systems that produce water
condensation.
Condensation occurs when relatively
warm moist air passes through the cold
evaporator. Moisture contained in the air
condenses (deposits) onto the evaporator
ns, then runs down into the drainage
system located under the evaporator. It is
this water that you see owing from the
condensate drain of the system.
The amount of condensation will vary
with the humidity of the location, so
the amount of condensate that ows
from the module will also vary (see the
section on condensate drain page 18).

Owner’s Manual – Airoheat®
16 H3025 10153 Rev. H
Owner’s Instructions
Does The Heat Pump Need Sun-
light To Operate?
Heat pump water heaters extract their
energy from the surrounding air and
not from sunlight. For this reason they
can efciently produce hot water any
time day or night and even on cloudy or
overcast days. It is not uncommon for
your system to operate during the night.
Caution: All water heaters have
the ability to produce hot water in a
surprisingly short time. To reduce the
risk of scald injury, it is mandatory
under the requirements of Australian
Standards AS3500 that an Australian
Standards approved temperature
control valve be tted to the hot water
supply pipe work. This valve should be
checked at regular intervals to ensure its
operation and settings remain correct.
What Should I Do During Holi-
days?
If you are going to be away for a week
or more, it is advisable to turn off the
electricity supply to the system. While
there is no damage likely if the electricity
is left on, you will consume energy
through storage tank heat losses which
can be avoided.
Warning: If the hot water system is
not used for two weeks or more, a
quantity of hydrogen gas, which is highly
ammable, may accumulate in the water
heater. 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 ame or any other electrical
appliance operating nearby. If hydrogen
is discharged through the tap, it will
probably make an unusual noise similar
to air escaping.
What Should I Check Before Mak-
ing A Service Call?
If, after checking the troubleshooting
points in the following section, the
problem has not been identied, please
contact the distributor from whom you
purchased the system.
Note: It is important to know that there
are no user serviceable components
in the system, and as such, it is
recommended that no covers be
removed and no adjustments made to
the system settings by anyone other
than an authorised representative.

Owner’s Manual – Airoheat®
17
H3025 10153 Rev. H
Troubleshooting
Pressure & Temperature Relief
Valve (PTR)
It is not unusual for the PTR Valve
to allow a small quantity of water to
escape during the heating cycle. The
amount of discharge will depend on hot
water usage.
Continuous Trickle From PTR
This is most likely due to a build up of
foreign matter. In this case, try gently
raising the easing lever on the Pressure
& Temperature Relief Valve for a few
seconds, then release gently. This may
dislodge a small particle of foreign
matter and rectify the fault.
Steady Flow From PTR
This may be caused by excessive water
supply pressure, a faulty PTR Valve, or a
faulty thermostat. Turn off the electricity
supply, turn off the water, and contact
your Dux agent.
No Hot Water
• Is the Pressure & Temperature Relief
Valve discharging too much water?
• Do you have the correct size water
heater for your requirements? Sizing
details are available from your Dux
supplier.
• Is one outlet (such as the shower)
using more hot water than you think?
• Carefully review the family’s hot
water usage and if necessary
check the shower ow rates with a
bucket, measuring the amount of
water used over that 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.
• Consider that during night time
heating, the time taken to heat the
tank can take longer (less energy in
the air) so you may nd that the tank
has not fully recovered from a period
of heavy usage the previous evening.
• Consider that often the hot water
usage of showers, washing machines
and dishwashers can be under
estimated. Review these appliances
to determine if your daily usage is
greater than the storage volume of
your water heater. For example, if
you have a 250 litre storage tank
and you are using 390 litres of
water, it is possible that there will be
certain times of the day where there
is insufcient hot water. It is also
advisable to inspect tap washers etc.
for leakage and replace if necessary.
High Electricity Bills
• Is the Pressure & Temperature Relief
Valve discharging too much water?
• Is one outlet (e.g. the shower) using
more hot water than you think?
• Is there a leaking hot water pipe or
dripping hot water tap? A small leak
can waste a large quantity of hot
water.

Owner’s Manual – Airoheat®
18 H3025 10153 Rev. H
Troubleshooting
• Replace faulty tap washers and
have your plumber rectify any
leaking pipe work.
Condensation Is Dripping From
Inside The Unit
Check that the discharge location of the
condensate drain has not been blocked
thereby restricting the condensation ow
away from the heat pump.
The Unit Does Not Run
Check that the power supply is turned
on and that the house circuit breakers or
Fuses are on and operational.