Dux AIROHEAT D2FHG4HW0C Installation instructions

Heat Pump Water Heater
Specications and materials may change without notice.
Effective for Airoheat® water heaters manufactured and sold after 1st November 2016.
Installation and Owner’s Manual
Model: D2FHG4HW0C
H4120 025941 Rev. D
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 – Airoheat Heat Pump
H4120 025941 Rev. D
© Dux Manufacturing Limited 2016. All rights reserved.

Installation and Owner’s Manual – Airoheat Heat Pump
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H4120 025941 Rev. D
Contents
Installation Requirements 2
Specications 4
Dielectric Fittings 5
Plumbing Connections 6
Filling and Draining 10
Electrical Connection 11
Commissioning 12
Safety Information 13
System Maintenance 15
Considering a Service Call? 16
Warranty 18

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H4120 025941 Rev. D
General:
This water heater must be installed
by a licensed tradesperson, and in
accordance with:
• AS/NZS 3500.4 Plumbing and
Drainage – Heated Water Services.
• Clause G12 of the NZ Building
Code (in New Zealand).
• AS/NZS 3000 Electrical Installations
(known as the Australian / New
Zealand Wiring Rules).
• Local authority regulations.
• Outside Australia and New Zealand,
please refer to local plumbing and
building codes and regulations.
Failure to comply with these
requirements may affect the warranty.
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.
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, Hotlogic®
controller, relief valve and sacricial
anodes.
Avoid positioning the water heater near
bedrooms or neighbours’ bedrooms as
it can be expected that the water heater
will run 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 storage water heater is installed.
Please consult Dux After Sales and
Service for advice if required.
Installation Requirements

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H4120 025941 Rev. D
Clearances:
Allow at least 700 mm clearance above
and 150 mm clearance to either side
of the water heater. If possible, allow
1,000 mm above the water heater
to provide clearance to change the
anodes through the top cover. Refer to
Specications on page 4.
Ensure there are no obstructions placed
on top of the water heater. The area
must also be clear of debris such as
leaves and tree branches.
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.
Note - the warranty will not cover
damage due to leakage of the water
heater if a properly drained safe tray has
not been installed.
Transport and Handling:
When moving the water heater, it must
be kept as close to vertical as possible
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.
Installation Requirements

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H4120 025941 Rev. D
Specifications

Installation and Owner’s Manual – Airoheat Heat Pump
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H4120 025941 Rev. D
Dielectric Fittings
A Dielectric Fittings Kit (Part No H3189)
is included with the water heater.
It is essential that dielectric ttings are
installed in
both the hot water outlet
and cold water inlet sockets. Dielectric
ttings do not need to be installed in the
unused hot water outlet or cold water
inlet sockets. Please also refer to the
Plumbing Connections section.
Failure to install both dielectric
ttings may void the warranty.
To install a dielectric tting:
1. Apply thread tape to both ends of
the brass nipple and install it into
the socket. Tighten the nipple to a
recommended torque of
~70 Nm .
2. Install the dielectric tting to the
brass nipple, with the knurled end
toward the tank. Tighten the tting to
a recommended torque of
~40 Nm .
3. Connect the pipework to the
dielectric tting. If brazed
connections are to be used, remove
all insulation components from the
dielectric tting to prevent damage.
Reassemble the tting once brazing
is complete and the ttings are cool.
Step 1
Brass Nipple Installed
Step 2
Dielectric Fitting Installed
Step 3
Pipework Connected

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H4120 025941 Rev. D
Water Supply:
This water heater has been
manufactured to suit the water
conditions of most Australian
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 anodes (supplied in a standard
heat pump water heater) may become
over-reactive. To alleviate this, the
magnesium alloy anodes should be
replaced with aluminium alloy anodes.
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. Please consult Dux
After Sales and Service for advice if
required.
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:

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H4120 025941 Rev. D
Cold Water Connection:
The water heater is intended to be
permanently connected to the water
supply main, and not connected by a
hose-set.
The cold water supply can be
connected to either of the RP¾”(DN20)
sockets marked “INLET” at the bottom
of the water heater. Before connecting
the pipework, it is essential that a
dielectric tting is installed in the
socket. Refer to Dielectric Fittings on
page 5.
An approved isolating valve, non-return
valve, and line strainer (optional but
recommended) must be tted between
the water supply main and the dielectric
tting. Refer to the diagram on page 6
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.
The unused socket marked “INLET”
is to be plugged with one of the brass
plugs supplied inside the electrical cover
of the water heater. Instructions on how
to remove the electrical cover can be
found on page 11. Ensure that a sealing
material is applied to the brass plug to
prevent water leaks.
Water Supply Pressure:
This water heater is designed for direct
connection to water supply pressures of
up to
800 kPa .
Where the mains pressure can exceed
or 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.
Plumbing Connections

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H4120 025941 Rev. D
Hot Water Connection:
The hot water pipe can be connected
to either of the RP¾”(DN20) sockets
marked “OUTLET” at the top of the
water heater. Before connecting
the pipework, it is essential that a
dielectric tting is installed in the
socket. Refer to Dielectric Fittings on
page 5.
If hot water pipes are to be connected
to both outlet sockets, dielectric ttings
must be installed in both sockets.
Additional dielectric ttings are available
from your local Dux supplier.
The unused socket marked “OUTLET”
is to be plugged with one of the brass
plugs supplied inside the electrical cover
of the water heater. Instructions on how
to remove the electrical cover can be
found on page 11. Ensure that a sealing
material is applied to the brass plug to
prevent water leaks.
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 HeatGuard
Ultra Tempering Valve made by RMC.
Plumbing Connections

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H4120 025941 Rev. D
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 11. Discard the
clear plastic packaging containing the
PTR Valve and brass plugs.
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.
If the drain line is to be xed to the water
heater case, the pipe clamps and screws
supplied in the included Dielectric Fittings
Kit (Part No H3189) must be used. Please
refer to the photograph below.
Do not use standard metal pipe
saddles.
Condensate Drain Line:
A condensate drain point is located under
the bottom louvre at the rear of the water
heater. 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

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H4120 025941 Rev. D
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 dielectric
tting 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

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H4120 025941 Rev. D
General:
This water heater is designed for single
phase 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 fuse or circuit breaker protecting the
supply to the water heater must have a
rating of at least 10 amps.
The water heater must not be connected
to an off peak tariff. It should be
connected to a continuous supply tariff
or a suitable controlled load tariff (such as
Tariff 33 in Queensland). Contact Dux After
Sales and Service if required.
The water heater is designed to be
permanently connected to xed wiring.
A set of terminals and a conduit entry is
provided for this purpose.
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.
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 two screws at the bottom
of the cover and sliding the cover
downwards to disengage the top edge.
Connections:
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. Check the Pressure & Temperature
Relief Valve, both of the brass plugs,
and their clear plastic packaging have
been removed from inside the cover.
2. Ensure the terminal block mounting
plate is horizontal.
3. Slide the cover up, ensuring the top
edge engages under the case.
4. 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.
5. Ret and tighten both screws in the
cover.
Ensure the water heater is lled
with water before turning on the
electricity supply.
Electrical Connection

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H4120 025941 Rev. D
Initial Operation:
1. Fill the water heater with water
before turning on the electrical
supply.
2. Turn on the electrical supply.
3. The Hotlogic® controller will initialise.
During this period LED 1 and LED 2
will blink alternately red/green.
(The Hotlogic® controller is visible
through the grill on the top of the
water heater).
4. Once initialisation is complete,
LED 1 and LED 2 should be a
steady green.
5. The Hotlogic® controller will
check the temperature of the
water in the tank and the ambient
air temperature. The Hotlogic®
controller is self-regulating. No
adjustments are required.
6. If conditions are suitable, the
compressor and fan will start. This
will take approximately 30 seconds
from the time the electrical supply is
turned on.
7. If the compressor and fan do not
start, check if LED 2 is ashing red
or LED 3 is a steady red. Contact
Dux After Sales and Service if
required.
Conditioning Cycle:
When the water heater is operated
for the rst time, it runs through a
conditioning cycle.
It will not reach full temperature until
approximately 60 litres of water is drawn
off and the water heater completes a
second heat-up cycle.
Commissioning
LED 1
(Power)
LED 2
(Sensor)
LED 3
(Output)
Explanation
Alternating Off Power on initialisation (LEDs blink Red-Green alternately)
Green Green Green Fan on (Compressor on/off)
Green Flashing Red Off Sensor error (1 blink = ambient sensor, 2 blinks = tank sensor)
Green Green Red Over Pressure Switch tripped
Hotlogic®LED Codes
LED 3
LED 2
LED 1

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H4120 025941 Rev. D
General:
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 and animals should be
supervised to ensure they do not
interfere with the water heater.
DO NOT store chemicals or ammable
materials, or spray aerosols near this
water heater.
DO NOT modify this water heater.
DO NOT operate the water heater with
any panels or covers removed.
Temperature Protection:
Water heaters can produce very hot
water. To reduce the risk of scald
injury, it is mandatory 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.
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 shown on the
compliance plate. 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 PTR Valve should be checked by
a licensed tradesperson for adequate
performance, or replaced at intervals
not exceeding ve years, or less in areas
where local regulations apply.
The PTR Valve is to be operated
regularly to remove lime deposits and
to verify it is not blocked. It is normal
for the valve to leak a small amount of
water during heating cycles.
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
PTR Valve may indicate a problem with
the water heater. This may be caused
by excessive water supply pressure, a
faulty PTR Valve or a faulty thermostat.
Turn off the water heater and contact
Dux After Sales and Service.
Safety Information

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H4120 025941 Rev. D
Safety Information
Electrical Safety:
This water heater is designed for single
phase 240V a.c. supply only. The
electrical connection must comply with
Local Supply Authority Regulations and
AS/NZS 3000.
Any electrical covers should be removed
only by a licensed tradesperson, and
only after the electrical supply to the
water heater has been isolated.
In addition to the PTR Valve, the
water heater is tted with a Hotlogic®
electronic controller, a refrigerant over-
pressure cut-out and a compressor
thermal 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.
Not Using Hot Water?
If the water heater is not used for two
weeks or more, a quantity of hydrogen
(which is highly ammable) 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 ame or any other
electrical appliance operating nearby. If
hydrogen is discharged through the tap
it will probably make a sound similar to
air escaping.

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H4120 025941 Rev. D
System Maintenance
Regular servicing will help to keep
the water heater operating safely and
efciently.
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.

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H4120 025941 Rev. D
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.
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 run 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 (and so contains less
energy).
The Hotlogic® controller monitors the
water temperature and the ambient
air temperature. Providing the ambient
conditions are suitable, when the water
temperature drops below 55°C, the
Hotlogic® controller starts the heat
pump module.
Depending on the humidity level, ice
may begin to form at around 5°C.
This has the potential to affect the
performance of the water heater.
The Hotlogic® controller monitors the
ambient conditions and triggers a de-
icing cycle if required.
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.
Considering a Service Call?

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H4120 025941 Rev. D
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 grill on top if the
water heater and the louvres 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 the
previous evening.
• 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?

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H4120 025941 Rev. D
Dux Heat Pump Storage Water
Heater - Warranty Summary:
All components of the water heater are
covered by a 1 year parts and labour
warranty. Extended warranties also
apply to the refrigeration components
and the storage tank. See below for
details and conditions.
The benets provided to you by this
warranty are in addition to any other
rights and remedies available to you
under the Australian Consumer Law.
One Year Parts and Labour
Warranty:
Dux Manufacturing Limited (“Dux”)
warrants against defects in the water
heater arising from faulty materials or
workmanship for a period of one year.
Conditions apply (see below).
During this period Dux will repair or
replace any failed component or where
necessary, in the absolute discretion
of Dux, replace the water heater, free
of charge including reasonable labour
costs incurred during normal business
working hours.
Extended Refrigeration
Component Warranty:
Dux warrants against failure of
refrigeration components for a further
period of one year (making a total of
two years from the Commencement of
Warranty).
During this period Dux will repair
or replace any failed refrigeration
component free of charge including
reasonable labour costs incurred during
normal business working hours.
Extended Tank Failure Warranty:
Dux also warrants against failure of
the storage tank for a further period
depending on the application:
• For single family dwellings, a
further period of four years (making
a total of ve years from the
Commencement of Warranty).
• For all other applications, a further
period of two years (making
a total of three years from the
Commencement of Warranty).
Conditions apply (see below).
During this period Dux will provide a
replacement water heater free of charge.
Installation and other labour costs are
the responsibility of the owner.
Warranty Conditions:
The warranty only applies to the water
heater itself and the components
supplied with the water heater by
Dux. The warranty does not cover
components supplied by others,
including the installer.
The tank failure warranty does not apply if
the water heater has been connected to
a water supply where the Total Dissolved
Solids content is greater than 2500 mg/L.
Warranty