Rheem MPs Series Technical Document

This water heater must be installed and serviced by a qualified person.
Please leave this guide with the householder.
Owner’s Guide
and
Installation Instructions
Air Sourced Split Heat Pump
Water Heater
MPs Series

PATENTS
This water heater may be protected by one or more patents or registered designs in the name of
Rheem Australia Pty Ltd.
TRADE MARKS
®Registered trademark of Rheem Australia Pty Ltd.
™ Trademark of Rheem Australia Pty Ltd.
Note: Every care has been taken to ensure accuracy in preparation of this publication.
No liability can be accepted for any consequences, which may arise as a result of its application.

3
CONTENTS
HOUSEHOLDER –We recommend you read pages 4 to 19.
The other pages are intended for the installer but may be of interest.
About Your Water Heater............................................................................................................ 4
Regular Care .............................................................................................................................. 11
Water Supplies........................................................................................................................... 13
Save A Service Call ................................................................................................................... 15
Installation.................................................................................................................................. 20
Heat Pump And Tank Assembly .............................................................................................. 27
Connections –Plumbing .......................................................................................................... 39
Connections –Electrical........................................................................................................... 42
Commissioning.......................................................................................................................... 44
Draining The Water Heater ....................................................................................................... 46
Warranty ..................................................................................................................................... 47

4
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
MODEL TYPE
Your Rheem®air sourced split heat pump storage tank is suitable for indoor or outdoor installation and the
heat pump module designed for outdoor installation only. The model you have chosen is a 561 series model.
This water heater is recommended for connection to a 24 hour per day power supply.
A Rheem heat pump water heater consumes less energy than an electric water heater. The impact on an
electricity account will depend on the tariff arrangement of the water heater replaced and where you live.
Contact your energy provider for more information on tariff arrangements and cost comparisons.
The air sourced heat pump water heater has a Rheemglas®vitreous enamel lined steel cylinder. The heat
pump module‟s evaporator absorbs heat from the surrounding air and transfers this heat into the water in the
storage tank.
When hot water is drawn off and cold water enters the tank,
the thermostat activates a fan, a compressor and a circulator.
The fan draws outside air in through the air inlet louvres at
the side and rear of the heat pump module and the pump
circulates water from the bottom of the storage tank through a
heat exchanger. Heat is absorbed from the air by an
evaporator and transferred into the water through the heat
exchanger. The resulting cold air is then discharged through
the air outlet grille back to atmosphere and the heated water
is circulated back into the storage tank. This process
continues while heating is required until the water in the
storage tank reaches a temperature of 60°C.
Even on cloudy or cold days, heat is drawn from the
surrounding air. The heat pump will operate when the
ambient air temperature is between a minimum of 3°C to 5°C
and maximum of 45°C to 55°C. The booster heating unit will
operate when the ambient air temperature is outside of this
temperature range, if heating is required. The efficiency of the
water heater increases as the surrounding ambient air
temperature increases within the operating range of the heat
pump.
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.
ELECTRIC BOOSTING
Ice may begin to form on the evaporator reducing the heat pump efficiency, when the ambient air
temperature falls below 7°C and the heat pump has been operating for an extended period. At ambient air
temperatures below 3°C to 5°C, the water heater deactivates the heat pump operation and switches to the
booster heating unit. During this period the evaporator will defrost if necessary.
At ambient air temperature above 45°C to 55°C, the water heater deactivates the heat pump operation and
switches to the booster heating unit.
The water inside the tank will be heated to a temperature of 60°C by the electric booster heating unit if
heating is required. The temperature setting of the sensor controlling the booster heating unit is not
adjustable and is set at 60°C.
The boost capacity of the booster heating unit in a 325 litre storage tank is 180 litres.
Note: The boost capacity of a low watts density or other than a 2.4 kW or 3.6 kW heating unit, if used, is
100 litres.

ABOUT YOUR WATER HEATER
5
FREEZE PROTECTION
The water heater has a freeze protection system. The freeze protection system will protect the water heater
from damage, by preventing ice forming in the waterways of the water heater, in the event of freezing
conditions occurring.
If the ambient air temperature falls below 4°C and the heat pump module is not operating, the system will
operate the circulator periodically. During this freeze protection cycle, the circulator will operate for three (3)
minutes and then rest for fifteen (15) minutes, before the cycle is recommenced. Water is circulated from the
storage tank through the heat pump circuit, to prevent freezing in the connecting pipe work and heat pump
module.
Warning: In areas where the ambient air temperature may fall below 0°C, power must be available to the
water heater at all times to prevent freezing in the heat pump circuit.
The system must be installed with the heat pump circuit hot and cold pipes fully insulated with closed cell
polymer insulation with a minimum thickness of 13 mm. Thicker insulation may be required to comply with
the requirements of AS/NZS 3500.4. The water heater has NO WARRANTY for freeze damage if the heat
pump circuit hot and cold pipes are not suitably insulated or if power is unavailable at the water heater.
MAINS PRESSURE
The water heater is designed to operate at mains pressure by connecting directly to the mains water supply.
If the mains supply pressure in your area exceeds that shown on page 22, a pressure limiting valve must be
fitted. The supply pressure should be greater than 350 kPa for true mains pressure operation to be achieved.
A minimum water supply pressure of 200 kPa is required to enable the heat pump circulator and heat pump
system to operate effectively.
HOW HOT SHOULD THE WATER BE?
The system controls (compressor, evaporator and fan) will operate
until a water temperature of 60°C is reached. If the ambient air
temperature is outside of the heat pump‟s operating range, the
water temperature is boosted automatically to 60°C by the electric
booster heating unit, if heating is required.
To meet the requirements of the National Plumbing Standard the
temperature of the stored water must not be below 60°C.
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
This water heater can deliver water at temperatures which can
cause scalding. Check the water temperature before use, such as
when entering a shower or filling a bath or basin, to ensure it is
suitable for the application and will not cause scald injury.
We recommend and it may also be required by regulations that an
approved temperature limiting device be fitted into the hot water
pipe work to the bathroom and ensuite when this water heater is
installed. This will keep the water temperature below 50°C at the
bathroom and ensuite. The risk of scald injury will be reduced and
still allow hotter water to the kitchen and laundry.
TEMPERATURE ADJUSTMENT
The thermostats controlling the heat pump and the booster heating unit are factory set and not adjustable.
typical maximum
temperature from heat
pump operation,
booster temperature
setting,
minimum recommended
stored water temperature
maximum recommended
supply temperature to
bathrooms and ensuites

ABOUT YOUR WATER HEATER
6
WARNING
This water heater is only intended to be operated by persons who have the experience or the knowledge and
the capabilities to do so. This water heater is not intended to be operated by persons with reduced physical,
sensory or mental capabilities, i.e. the infirm, or by children. Children should be supervised to ensure they do
not interfere with the water heater.
This water heater uses 240 V AC electrical power for operation of the control systems and the electrically
operated components. The removal of the access cover(s) will expose 240 volt wiring. They must only be
removed by a qualified person.
Do not use aerosols, stain removers and household chemicals near the water heater whilst it is
working. Gases from some aerosol sprays, stain removers and household chemicals are corrosive to the
materials used in the heat pump system.
Do not store swimming pool chemicals, household cleaners, etc., near the water heater.
Ensure the air flow, air inlet louvres and outlet grille are not obstructed in any way at any time.
SAFETY
This water heater is supplied with a thermostat, two over-temperature energy cut-outs and a combination
temperature pressure relief valve. These devices must not be tampered with or removed. The water heater
must not be operated unless each of these devices is fitted and is in working order.
The operation of the over-temperature cut-out on the thermostat indicates a possibly dangerous situation. If
the over-temperature cut-out operates, it must not be reset and the water heater must be serviced by a
qualified person.
If the electrical supply conduit to the water heater is damaged, it must be replaced by a qualified person in
order to avoid a hazard. Phone Rheem Service or their nearest Accredited Service Agent to arrange for an
inspection.
Warning: For continued safety of this water heater it must be installed, operated and maintained in
accordance with the Owner‟s Guide and Installation Instructions.
The Rheem warranty may not cover faults if relief valves or other safety devices are tampered with or
if the installation is not in accordance with these instructions.

ABOUT YOUR WATER HEATER
7
OPERATING MODE MONITOR
An operating mode monitor is located on the front of the heat pump module and houses a green and a red
LED.
The green LED, marked “NORMAL”, indicates the current operating mode of the heat pump water heater
and the red LED, marked “ATTENTION”, indicates a fault mode.
The green LED will emit either a constant glow or a series of flashes, with a
2 second interval between each series. A series of long green flashes may
also be emitted.
The red LED will emit a series of flashes, with a 2 second interval between
each series, only if there is a particular fault condition with the system.
The operating modes are:
Flashes
Operating Modes
solid green
(remains on)
Standby mode –water is hot
1 x green
Call for heating received –system checks performed
Note: unit may wait and continue flashing until compressor has cooled from its last operation
2 x green
Circulator commences circulation
3 x green
Heat pump operation –compressor and fan running
4 x green
Defrost mode –circulator operates for three (3) minutes
long green
Heating unit on –ambient air temperature below 3°C to 5°C or above 45°C to 55°C
no green
(remains off)
No power at the water heater or a possible fault condition
Refer to notes below before calling for service
Notes:
Power must be available at the water heater and to the heat pump for the LEDs to glow or flash.
When power is turned on or reconnected to the water heater, the red LED will emit a solid glow for
three (3) seconds and then extinguish. This is normal operation and does not indicate a fault. The LED
display will then return to the current operational status.
If there is power to the water heater and the green LED is off or the red LED is flashing, this indicates
there may be a fault condition with the water heater. The red LED may emit up to nine flashes in each
series of flashes. Refer to “Possible fault condition” on page 8.
Time controlled power supply
If the water heater is connected to a time controlled power supply, then during periods of no power
supply at the water heater the LEDs will be off.
This is not a fault condition, but a result of no power being available to energise the LEDs.
The green LED will recommence glowing or flashing when power is available again at the water heater.

ABOUT YOUR WATER HEATER
8
Possible fault condition
There may be a fault condition with the water heater if either:
there is power available at the water heater and the green LED is off
Before phoning to arrange a service inspection due to the green LED being off, refer to “Heat Pump
Is Not Operating” on page 16 in the “Save A Service Call” section of this Owner‟s Guide.
or
the red LED is flashing –the red LED may emit up to nine flashes in each series of flashes
The fault condition which led to the red LED flashing may be cleared after the backup heating cycle
by the booster heating unit has completed and the red LED has gone out. If the red LED has gone
out, when heating is next required the green LED will flash and the heat pump will commence to
operate. If the heat pump stops operating and the red LED recommences to flash, a service call
may be required.
Before phoning to arrange a service inspection due to the red LED flashing, refer to “Heat Pump Is
Not Operating” on page 16 in the “Save A Service Call” section of this Owner‟s Guide.
TIMER CONTROL
A timer can be installed in the electrical circuit to the water heater. The timer must be weatherproof if it is
installed outdoors. The suitability of connection to less than a 24 hour per day power supply is subject to hot
water load, location and climate.
It may be desirable for the water heater not to operate between certain hours, such as during the peak
period when connected to a Time of Use electricity supply due to a more expensive tariff rate applying.
A timer will affect the operating times of both the heat pump circuit and the booster heating unit.
Notes:
This water heater is recommended for connection to a 24 hour per day power supply. If there is a risk of
freezing conditions, the electrical supply to the water heater should not be switched off, otherwise
damage could result (refer to “Freeze Protection” on page 5).
A 325 model water heater is not suitable to be connected to a power supply of less than 16 hours per
day. At least 8 hours of power connection should be available during daylight hours.
TO TURN OFF THE WATER HEATER
If you plan to be away from home, we recommend you leave the water heater switched on in the event of
freezing conditions occurring.
If it is necessary to turn off the water heater:
Switch off the electrical supply at the isolating switch to the water heater.
Close the cold water isolation valve at the inlet to the water heater.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off, otherwise damage could result (refer to “Freeze Protection” on page 5).

ABOUT YOUR WATER HEATER
9
TO TURN ON THE WATER HEATER
Open the cold water isolation valve fully on the cold water line to the water heater.
Switch on the electrical supply at the isolating switch to the water heater.
Note: When power is turned on or reconnected to the water heater, the red LED will emit a solid glow for
three (3) seconds and then extinguish. This is normal operation and does not indicate a fault. The LED
display will then return to the current operational status.
The water heater may take up to forty five (45) minutes to commence operating when the power supply is
switched on. The heat pump will only operate when power is available at the water heater, the water in the
storage tank requires heating, the heat pump compressor is cool and the ambient air temperature is within
the heat pump‟s operating temperature range of between a minimum of 3°C to 5°C and a maximum of 45°C
to 55°C. If the ambient temperature is outside of this range, the water heater will commence heating with the
booster heating unit.
When the heat pump is operating, the system will switch to the booster heating unit if the detected ambient
air temperature is outside the operating temperature range of between a minimum of 3°C to 5°C and a
maximum of 45°C to 55°C.
The system will switch back to heat pump operation from the booster heating unit if the detected ambient air
temperature has moved back within the heat pump‟s operating temperature range.
Note: The heat pump may not turn on immediately after either having just completed a heating cycle and
more hot water is drawn from the water heater or power is shut down to the compressor, either during or at
the end of a heating cycle. The heat pump will wait until the compressor has cooled down and the conditions
for start up are favourable in order to protect the compressor from damage. This will be a minimum of forty
five (45) minutes and may take up to ninety (90) minutes from the last heating cycle.
GOING ON HOLIDAYS
If you plan to be away from home, we recommend you leave the water heater switched on in the event of
freezing conditions occurring (refer to “Freeze Protection” on page 5). If it is necessary to turn off the water
heater, refer to “To Turn Off The Water Heater” on page 8.
PRECAUTIONS
Where damage to property can occur in the event of the water heater leaking, the water heater must be
installed in a safe tray. Construction, installation and draining of a safe tray must comply with AS/NZS 3500.4
and all local codes and regulatory authority requirements.
The water heater must be maintained in accordance with the Owner‟s Guide and Installation Instructions.
Refer to “Regular Care” on page 11 and to “Anode Inspection and Replacement” on page 13.
If this water heater is to be used where an uninterrupted hot water supply is necessary for your application or
business you should ensure that you have back up redundancy within the hot water system design. This
should ensure the continuity of hot water supply in the event that this water heater were to become
inoperable for any reason. We recommend you seek advice from your plumber or specifier about your needs
and building back up redundancy into your hot water supply system.
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 20 to 25. The water heater must be installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS/NZS 3000 and all local codes and regulatory authority
requirements.
In New Zealand, the installation must also conform with Clause G12 of the New Zealand Building Code.

ABOUT YOUR WATER HEATER
10
VICTORIAN CUSTOMERS
Notice to Victorian Customers from the Victorian Plumbing Industry Commission. This water heater must be
installed by a licensed person as required by the Victorian Building Act 1993.
Only a licensed person will give you a Compliance Certificate, showing that the work complies with all the
relevant Standards. Only a licensed person will have insurance protecting their workmanship for 6 years.
Make sure you use a licensed person to install this water heater and ask for your Compliance Certificate.
DOES THE WATER CHEMISTRY AFFECT THE WATER HEATER?
The water heater is suitable for most public water supplies, however some water chemistries may have
detrimental effects on the water heater, its components and fittings. Refer to “Water Supplies” on page 13.
If you are in a known harsh water area or you are not sure of your water chemistry, have your water checked
against the conditions described on pages 13 to 14.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer‟s warranty (refer to page 47). There are a number of
factors that will affect the length of service the water heater will provide. These include but are not limited to
the water chemistry, the water pressure, the water temperature (inlet and outlet) and the water usage
pattern. Refer to “Precautions” on page 9.
ENVIRONMENT
At the end of the service life of the heat pump water heater and prior to the water heater being disposed of, a
person qualified to work with refrigerants must recover the refrigerant from within the sealed system. The
refrigerant must not be vented to atmosphere. Phone Rheem Service or their nearest Accredited Service
Agent to arrange for an inspection.

11
REGULAR CARE
MINOR SIX MONTH MAINTENANCE
It is recommended minor maintenance be performed every six months by the dwelling occupant.
The minor maintenance includes:
Operate the easing lever on the temperature pressure relief valve. It is very important you raise and
lower the lever gently. Refer to “Temperature Pressure Relief Valve” on page 12.
Warning: Exercise care to avoid any splashing of water, as water discharged from the drain line will
be hot. Stand clear of the drain line‟s point of discharge when operating the valve‟s lever.
Operate the easing lever on the expansion control valve (if fitted). It is very important you raise and
lower the lever gently. Refer to “Expansion Control Valve” on page 12.
Check the drain line from the safe tray (if one is installed) is not blocked.
MAJOR FIVE YEAR SERVICE
It is recommended a major five year service be conducted on the water heater. The service must be
conducted by a qualified person. Phone Rheem Service or their nearest Accredited Service Agent.
Note: The five year service and routine replacement of any components, such as the anode and relief
valve(s), are not included in the Rheem warranty. A charge will be made for this work.
The major service includes:
Replace the temperature pressure relief valve.
Inspect and flush the expansion control valve (if fitted). If required, replace the valve.
Inspect and if required, replace the anode.
If the anode is not replaced, it should be replaced within three years of this service (refer to “Anode
Inspection and Replacement” on page 13).
Check the electric heating unit for excessive calcium build up or corrosion and replace if necessary.
Check and inspect the heat pump module for operation.
Visually check the unit for any potential problems.
Inspect all connections.
Check the condensate drain.
Check the drain line from the safe tray (if one is installed) is not blocked.
Note: The water heater may need to be drained during this service. After the completion of the service, the
water heater will take some time to reheat the water. Depending upon the power supply connection, hot
water may not be available until the next day.
HEAT PUMP SYSTEM
It is recommended the evaporator and refrigeration system is checked every five years. In particularly dusty
environments, it may be necessary to have the heat pump system checked and cleaned of dust and residue
on a more regular basis.

REGULAR CARE
12
TEMPERATURE PRESSURE RELIEF VALVE
This valve is near the top of the water heater and is essential for its
safe operation. It is possible for the valve to release a little water
through the drain line during each heating period. This occurs as the
water is heated and expands by approximately 1/50 of its volume.
Continuous leakage of water from the valve and its drain line may
indicate a problem with the water heater (refer to “Temperature
Pressure Relief Valve Running” on page 18).
Warning: Never block the outlet of this valve or its drain line for
any reason.
Operate the easing lever on the temperature pressure relief valve
once every six months. It is very important you raise and lower
the lever gently.
DANGER: Failure to do this may result in the water heater
cylinder failing, or under certain circumstances, exploding.
Warning: Exercise care to avoid any splashing of water, as
water discharged from the drain line will be hot. Stand clear of the
drain line‟s point of discharge when operating the valve‟s lever.
If water does not flow freely from the drain line when the lever is
lifted, then the water heater must be checked. Phone Rheem
Service or their nearest Accredited Service Agent to arrange for an
inspection.
The temperature pressure relief valve should be replaced at
intervals not exceeding 5 years, or more frequently in areas where
there is a high incidence of water deposits (refer to “Water Supplies”
on page 13).
EXPANSION CONTROL VALVE
In many areas, including South Australia, Western Australia and scaling water areas, an expansion control
valve is fitted to the cold water line to the water heater. The expansion control valve may discharge a small
quantity of water from its drain line during the heating period instead of the temperature pressure relief valve
on the water heater.
Operate the easing lever on the expansion control valve once every six months. It is very important you
raise and lower the lever gently. The expansion control valve should be checked for performance or
replaced at intervals not exceeding 5 years, or more frequently in areas where there is a high incidence of
water deposits.
water
heater
drain
line
lift until water
flows from the
drain line –
lower gently

13
WATER SUPPLIES
This water heater must be installed in accordance with this advice to be covered by the Rheem
warranty.
This water heater is manufactured to suit the water conditions of most public reticulated water supplies.
However, there are some known water chemistries which can have detrimental effects on the water heater
and its operation and / or life expectancy. If you are unsure of your water chemistry, you may be able to
obtain information from your local water supply authority. This water heater should only be connected to a
water supply which complies with these guidelines for the Rheem warranty to apply.
CHANGE OF WATER SUPPLY
The changing or alternating from one water supply to another can have a detrimental effect on the operation
and / or life expectation of a number of components in this water heater.
Where there is a changeover from one water supply to another, e.g. a rainwater tank supply, bore water
supply, desalinated water supply, public reticulated water supply or water brought in from another supply,
then water chemistry information should be sought from the supplier or it should be tested to ensure the
water supply meets the requirements given in these guidelines for the Rheem warranty to apply.
ANODE
The vitreous enamel lined cylinder of the water heater is only covered by the Rheem warranty when the total
dissolved solids (TDS) content in the water is less than 2500 mg/L and when the correct colour coded anode
is used. If an incorrect colour coded anode is used in the water heater, any resultant faults will not be
covered by the Rheem warranty. In addition, the use of an incorrect colour coded anode may shorten the life
of the storage tank.
The correct colour coded anode is as shown in the following table:
Total Dissolved Solids
Anode colour code
0 –40 mg/L
Green
40 –150 mg/L
Green or Black
150 –400 mg/L
Black
400 –600 mg/L
Black or Blue
600 –2500 mg/L
Blue
2500 mg/L +
Blue (no cylinder warranty)
The changing of anodes must be carried out by a qualified person.
Note: Some water analysis reports may state the conductivity of the water rather than the level of total
dissolved solids. Conductivity, measured in microsiemens per centimetre (µS / cm), is directly proportional to
the TDS content of the water. TDS, in mg / L, is approximately 70% of the conductivity in µS / cm.
ANODE INSPECTION AND REPLACEMENT
The anode installed in your water heater will slowly dissipate whilst protecting the cylinder. The life of the
cylinder may be extended by replacing the anode.
If the anode is not replaced during a five year service (refer to “Major Five Year Service” on page 11) then
the maximum time after installation when the anode should be replaced for this water heater is 8 years.
For water supplies which are either softened, desalinated or where the water supply may alternate between
a water tank and a reticulated public supply or another supply, it is recommended the anode be replaced
within 5 years of installation.

WATER SUPPLIES
14
CAUTION
If the water supply has a TDS greater than 150 mg/L and a green anode has not been changed to a black
anode, or if the TDS is greater than 600 mg/L and the anode has not been changed to a blue anode, there is
the possibility the anode may become overactive and hydrogen gas could accumulate in the top of the water
heater during long periods of no use. In areas where this is likely to occur, the installer should instruct the
householder on how to dissipate the gas safely.
If, under these conditions, the water heater has not been used for two or more weeks the following procedure
should be carried out before using any electrical appliances (automatic washing machines and dishwashers)
which are connected to the hot water supply.
The hydrogen, which is highly flammable, should be vented safely by opening a hot tap and allowing the
water to flow. There should be no smoking or naked flame near the tap whilst it is turned on. Any hydrogen
gas will be dissipated. This is indicated by an unusual spurting of the water from the tap. Once the water runs
freely, any hydrogen in the system will have been released.
SATURATION INDEX
The saturation index (SI) is used as a measure of the water‟s corrosive or scaling properties.
Where the saturation index is less than –1.0, the water is very corrosive and the Rheem warranty does not
apply to the water heater. In a corrosive water supply, the water can attack copper parts and cause them to
fail.
Where the saturation index exceeds +0.40, the water is very scaling and the Rheem warranty does not apply
to the water heater.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the
water.
CHLORIDE AND PH
Where the chloride level exceeds 250 mg/L the Rheem warranty does not apply to the water heater. In a
high chloride water supply, the water can corrode stainless steel parts and cause them to fail.
Where the pH is less than 6.0 the Rheem warranty does not apply to the water heater. pH is a measure of
whether the water is alkaline or acid. In an acidic water supply, the water can attack stainless steel parts and
cause them to fail.
Water with a pH less than 6.0 may be treated to raise the pH. The water supply from a rainwater tank in a
metropolitan area is likely to be corrosive due to the dissolution of atmospheric contaminants.
SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING WARRANTY
The water heater is not suitable for certain water chemistries. Those chemistries are listed below. If the water
heater is connected at any time to a water supply with the following water chemistry, the Rheem warranty will
not cover any resultant faults:
Water Chemistry
Component
Total Dissolved Solids (TDS) > 2500 mg/L
water heater cylinder
Total Dissolved Solids (TDS) not suitable for anode type
water heater cylinder
Saturation Index (SI) < -1.0
water heater
Saturation Index (SI) > +0.4
water heater
Chloride > 250 mg/L
water heater
pH < 6.0
water heater

15
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any condition or
fault that is not related to manufacture or failure of a part.
NOT ENOUGH HOT WATER (OR NO HOT WATER)
Is the electricity switched on?
Inspect the isolating switch marked “HOT WATER” or “WATER HEATER” at the switchboard and the
isolating switch (if one is installed) at the water heater and ensure they are turned on.
Check the fuse marked “HOT WATER” or “WATER HEATER” at the switchboard.
Is a timer installed?
If a timer has been installed, ensure sufficient time has been allowed to reheat the storage tank.
Are you using more hot water than you think?
Is one outlet (especially the shower) using more hot water than you think?
Very often it is not realised the amount of hot water used, particularly when showering. Carefully review
the family‟s hot water usage. As you have installed an energy saving appliance, energy saving should
also be practised in the home.
Adjust your water usage pattern to take advantage of maximum energy gains. Have your plumber install
a flow control valve to each shower outlet to reduce water usage.
Heat pump fault
Has the heat pump developed a fault and the red LED is flashing?
The heat pump will not operate and the water heater will switch to
backup heating mode using the booster heating unit.
Refer to “Heat Pump Is Not Operating” on page 16.
Temperature pressure relief valve running
Is the relief valve discharging too much water?
Refer to “Temperature Pressure Relief Valve Running” on page 18.
Water heater size
Do you have the correct size water heater for your requirements?
WATER NOT HOT ENOUGH
You may find that due to heavy hot water usage the water temperature may be lower than normally
expected, due to insufficient heating time being allowed. You will need to carefully plan your use of the hot
water on such occasions.
WATER TOO HOT
The water heater during heat pump operation and booster heating mode will heat the water to a temperature
of 60°C. If a heat pump component has developed a fault condition, the heat pump will not operate and the
water heater will switch to backup heating mode to ensure a supply of hot water.
In backup heating mode, the booster heating unit will operate if heating of the water is required, regardless of
the ambient air temperature. The water heater, during backup heating mode will heat the water to a
temperature of either 60°C or 70°C, depending upon the fault condition.
The red LED will flash to indicate the fault mode that has occurred. Refer to “Heat Pump Is Not Operating” on
page 16.

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HEAT PUMP IS NOT OPERATING
There must be power available at the water heater and to the heat pump for the heat pump to operate and
for the LEDs to glow or flash.
Time controlled power supply (no power at the water heater)
If the water heater is connected to a time controlled power supply, then during periods of no power
supply at the water heater the LEDs will be off.
This is not a fault condition, but a result of no power being available to energise the LEDs.
The green LED will recommence glowing or flashing when power is available again at the water heater.
Heat pump operating range
The heat pump‟s operating range is between an ambient air temperature of a minimum of 3°C to 5°C
and a maximum of 45°C to 55°C. The heat pump will not operate for extended periods when the
ambient air temperature is outside the heat pump‟s operating range.
Heating will switch to the booster heating unit in booster heating mode (long green flash) instead. The
water will be heated to 60°C during these periods.
The green LED will glow (standby mode –water is hot) when the booster heating unit completes the
booster heating mode cycle.
Thermal cut out activated
Has the thermal cut out activated and the red LED is flashing a series of single flashes?
The refrigeration circuit is protected by a thermal sensor located on the compressor. This will activate a
thermal cut out in the event of thermal surges or excessive heat in the refrigeration system.
If the thermal cut out has activated, the red LED will flash a fault mode of a series of single flashes and
the heat pump will not operate. The water heater will switch to backup heating mode using the booster
heating unit to ensure a supply of hot water. In backup heating mode, the water will be heated to a
temperature of 70°C if the thermal cut out has been activated.
The thermal cut out will automatically reset itself when the booster heating unit has completed one
heating cycle and the compressor cools down.
Refer to “Backup heating mode and series of red flashes” on page 16.
Heat pump fault condition
If the heat pump has developed a fault condition, the heat pump will not operate and the red LED will
flash a fault mode of a series of one (1) to nine (9) flashes.
If a series of two (2) flashes occurs, the heat pump will not switch to backup heating mode. Phone
Rheem Service or their nearest Accredited Service Agent to arrange for an inspection.
If a single flash or a series of three (3) to nine (9) flashes occurs, the water heater will switch to backup
heating mode to ensure a supply of hot water. In backup heating mode, the water will be heated to a
temperature of either 60°C or 70°C.
Refer to “Backup heating mode and series of red flashes” on page 16.
Backup heating mode and series of red flashes
During the backup heating mode by the booster heating unit, caused by either the thermal cut out
activating or a heat pump fault condition, the red LED will emit a series of flashes.
Fault Mode –2 red LED flashes
If a series of two (2) flashes occurs, the heat pump will not switch to backup heating mode. Phone
Rheem Service or their nearest Accredited Service Agent to arrange for an inspection.

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Fault Mode –4, 5, 9 red LED flashes
In backup heating mode with a fault mode of either a four (4), five (5) or nine (9) series of red flashes,
the water is heated to a temperature of 60°C. At the completion of a heating cycle by the booster heating
unit, the red LED will continue to flash, the green LED will commence to glow or flash, the heat pump will
not operate and the water heater will continue to operate in backup heating mode whenever heating is
required, until the electrical supply to the water heater is switched off and on again.
The fault mode is recorded to the heat pump controller‟s memory. The Defrost Mode of the water heater
will be able to operate during these fault modes.
If the electrical supply is switched off either at the isolating switch to the water heater or by a time
controlled power supply, the red LED will go out. When the electrical supply is switched on again, the
red LED will recommence to flash the fault mode for thirty (30) seconds. At the end of the thirty (30)
second period and depending upon the fault condition, the red LED may stop flashing and the green
LED will commence to glow or flash.
If the red LED stops flashing and the green LED commences to glow or flash, the water heater has reset
the fault condition and switched back to normal operation. The heat pump will commence to operate
when heating is next required. Refer to “Heat Pump Start Up After Backup Heating Mode” on page 17.
If the red LED continues to flash after thirty (30) seconds, the fault condition which led to the red LED
flashing has not cleared and there may be a problem with the heat pump. Count the number of red
flashes and phone Rheem Service or their nearest Accredited Service Agent to arrange for an
inspection.
Fault Mode –1, 3, 6, 7 red LED flashes
In backup heating mode with a fault mode of either a one (1), three (3), six (6) or seven (7) series of red
flashes, the water is heated to a temperature of 70°C. At the completion of a heating cycle by the
booster heating unit, the thermostat controlling the booster heating unit opens circuit cutting power to the
heat pump causing the red LED to go out. The fault condition which led to the red LED flashing may be
cleared when the backup heating cycle has completed.
The fault mode is recorded to the heat pump controller‟s memory. The Defrost Mode of the water heater
will not be able to operate during these fault modes, either during backup heating mode by the booster
heating unit or after the thermostat opens circuit cutting power to the heat pump.
Both LEDs will remain off for an extended period of time until the water temperature in the top of the
water heater drops to below 62°C and the thermostat closes circuit reinstating power to the heat pump.
The red LED will recommence to flash the fault mode for thirty (30) seconds. At the end of the thirty (30)
second period, the green LED will commence to glow or flash. The heat pump will commence to operate
when heating is next required. Refer to “Heat Pump Start Up After Backup Heating Mode” on page 17.
Heat Pump Start Up After Backup Heating Mode
The green LED will glow (standby mode –water is hot) if the water temperature in the lower part of the
water heater is 50°C or more.
The green LED will flash if the water temperature in the lower part of the water heater is less than 50°C.
Note: If the green LED is glowing, then to check whether there may be problem with the heat pump,
open a hot tap and allow to run for ten to fifteen minutes. This will draw cold water into the lower part of
the water heater and the green LED will commence to flash. Close the hot tap when the green LED
commences to flash.
The heat pump will commence to operate when the green LED is flashing.
If the heat pump stops operating and the red LED recommences to flash, the fault condition which led to
the red LED flashing may not have cleared and there may be a problem with the heat pump. Count the
number of red flashes and phone Rheem Service or their nearest Accredited Service Agent to arrange
for an inspection.
Note: If the ambient air temperature is outside of the heat pump‟s operating range, the water heater may
switch to the booster heating unit (long green flash) after three (3) minutes of heat pump operation to
heat the water in booster heating mode.
The fault mode is cleared from the heat pump controller‟s memory after the water heater successfully
completes a full heat up cycle using the heat pump.

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Green LED is off
There may be a fault condition with the heat pump if there is power available at the water heater and the
green LED is off. Before phoning to arrange a service inspection:
inspect the isolating switch marked “HOT WATER” or “WATER HEATER” at the switchboard and
the isolating switch (if one is installed) at the water heater and ensure they are turned on
check the fuse marked “HOT WATER” or “WATER HEATER” at the switchboard
if a timer has been installed, check the time settings
check the power supply tariff the water heater is connected to confirm power should be available to
the water heater.
Refer also to “Thermal cut out activated” on page 16 and to “Heat pump fault condition”on page 16.
If the green LED is off and one of these conditions is not the cause, phone Rheem Service or their
nearest Accredited Service Agent to arrange for an inspection.
TEMPERATURE PRESSURE RELIEF VALVE RUNNING
Normal Operation
It is normal and desirable this valve allows a small quantity of
water to escape during the heating cycle. However, if it discharges
more than a bucket full of water in 24 hours, there may be another
problem.
Continuous dribble
Try gently raising the easing lever on the relief valve for a few
seconds (refer to “Temperature Pressure Relief Valve” on
page 12). This may dislodge a small particle of foreign matter and
clear the fault. Release the lever gently.
Steady flows for long periods (often at night)
This may indicate the mains water pressure sometimes rises
above the designed pressure of the water heater. Ask your
installing plumber to fit a pressure limiting valve.
Warning: Never replace the relief valve with one of a higher
pressure rating.
Heavy flows of hot water until the water heater is cold - then stops until water reheats
The water heater must be switched off at the isolating switch or switchboard. Phone Rheem Service or
their nearest Accredited Service Agent to arrange for an inspection.
EXPANSION CONTROL VALVE RUNNING
If an expansion control valve is fitted in the cold water line to the water heater (refer to page 39)it may
discharge a small quantity of water instead of the temperature pressure relief valve on the water heater. The
benefit is that energy is conserved as the discharged water is cooler.

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HIGHER THAN EXPECTED ELECTRICITY BILLS
With the installation of your air sourced split heat pump water heater, maximum electrical energy savings can
be achieved. Should you at any time, feel your electricity account is higher than expected, we suggest you
check the following points:
Is the water heater operating in backup heating mode with the red LED flashing?
If there is a fault condition with the heat pump system, the water heater will default to backup heating
mode to ensure a supply of hot water. Check to see if the red LED is flashing as this will indicate there
may be a fault with the system.
Refer to “Heat Pump Is Not Operating” on page 16.
Is the relief valve running excessively?
Refer to “Temperature Pressure Relief Valve Running” on
page 18.
Is one outlet (especially the shower) using more hot water than
you think?
Refer to “Not Enough Hot Water” on page 15.
Is there a leaking hot water pipe, dripping hot water tap, etc?
Even a small leak will waste a surprising quantity of hot water and energy. Replace faulty tap washers,
and have your plumber rectify any leaking pipe work.
Has there been an increase in hot water usage?
An increase in hot water usage will result in an increase in heat pump operation.
Has your water heating tariff rate been increased by your electricity retailer since your previous account?
Is the heat pump water heater on the same tariff as the water heater replaced?
The impact on an electricity account will depend upon the tariff arrangement of the water heater
replaced and where you live. Contact your energy provider for more information on tariff arrangements
and cost comparisons.
Prolonged periods of use when the ambient air temperature is outside of the heat pumps operating
range will increase the amount of boosting and increase running costs.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE,
PHONE RHEEM SERVICE OR THEIR NEAREST ACCREDITED SERVICE AGENT.

20
INSTALLATION
THE HEAT PUMP MODULE OF THIS WATER HEATER IS FOR OUTDOOR INSTALLATION ONLY.
THIS WATER HEATER IS NOT SUITABLE FOR POOL HEATING.
INSTALLATION STANDARDS
The water heater must be installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS/NZS 3000 and all local codes and regulatory authority
requirements.
In New Zealand, the installation must also conform with Clause G12 of the New Zealand Building Code.
Victorian Installers
Notice to Victorian Installers from the Victorian Plumbing Industry Commission if this solar water heater is
installed in a new Class 1 dwelling in the State of Victoria. The system model number is to be recorded on
the Certificate of Compliance. It is also a requirement to provide the householder with permanent
documentation recording the system model number exactly as it is shown in the „List of systems capable of
complying with the regulations‟ published by Sustainability Victoria (see www.sustainability.vic.gov.au). This
documentation may be in the form of an indelible label adhered to the solar storage tank, or other suitable
form placed in an accessible location, such as the meter box, for later inspection.
WATER HEATER APPLICATION
This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
If this water heater is to be used where an uninterrupted hot water supply is necessary for the application or
business, then there should be redundancy within the hot water system design. This should ensure the
continuity of hot water supply in the event that this water heater was to become inoperable for any reason.
We recommend you provide advice to the system owner about their needs and building backup redundancy
into the hot water supply system.
This water heater is recommended for connection to a 24 hour per day power supply.
A Rheem heat pump water heater consumes less energy than an electric water heater. The impact on an
electricity account will depend on the tariff arrangement of the water heater replaced and the installation
location. Contact the energy provider for more information on tariff arrangements and cost comparisons.
STORAGE TANK AND HEAT PUMP MODULE
The heat pump water heater is made of two main components, the storage tank and the heat pump module.
For transport and handling (weight) purposes both items are shipped separately. The water heater must not
be operated until both components are installed and the interconnecting pipe work and wiring complete.
Refer to “Heat Pump and Tank Assembly” on page 27.
Take care when handling the heat pump module. The jacket of the heat pump module needs to be handled
gently so as not to cause damage.
Care must be taken during transportation and handling. Do not lay the heat pump module down and
do not tilt the heat pump module more than 30° from the vertical. This will displace the compressor
lubricating oil. If the heat pump module has been tilted more than 30° from the vertical during handling, it will
need one hour to drain back before the power to the water heater can be switched on, otherwise damage to
the compressor may result.
All packaging materials must be removed from the water heater prior to its installation. This includes the
removal of the cardboard base of the carton from the underside of the water heater.