Rheem 953060DP Technical Document

This water heater must be installed and serviced by a qualified person.
Please leave this guide with a responsible officer.
Owners Guide
and
Installation Instructions
Commercial Air to Water
Heat Pump PLUS Water Heater
61kW to 212kW
WMKA21549

An electronic copy of these Owner’s Guide and Installation Instructions can be downloaded
from rheem.com.au and rheem.co.nz.
PATENTS
This water heater may be protected by one or more patents or registered designs.
TRADEMARKS
®Registered trademark of Rheem Australia Pty Ltd.
TM 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.

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CONTENTS
RESPONSIBLE OFFICER
This booklet contains important information about your
new water heater, including terms of the Rheem warranty.
We recommend you read pages 8 to 27
and the terms of the Rheem warranty on pages 4 to 7.
The other pages are intended for the installer but may be of interest.
Contents.......................................................................................3
Rheem Heat Pump Water Heater Warranty - Australia & New
Zealand Only –.............................................................................4
Safety, Warnings, Installation Notes .........................................8
About Your Water Heater..........................................................12
How Your Water Heater Works.................................................16
Maintenance Requirements......................................................19
Water Supplies...........................................................................21
Save A Service Call ...................................................................24
Installation..................................................................................28
Heat Pump And Tank Assembly ..............................................43
Manifold Installations................................................................47
Connections –Plumbing ..........................................................50
Commissioning..........................................................................74
Draining The Water Heater .......................................................86
Automatic Defrost .....................................................................89
HEAT PUMP COMMISSIONING REPORT ................................91
RHEEM AUSTRALIA PTY LTD, A.B.N. 21 098 823 511
www.rheem.com.au, www.rheem.co.nz
For Service Telephone 131 031 AUSTRALIA or 0800 657 335 NEW ZEALAND

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RHEEM HEAT PUMP WATER HEATER WARRANTY
- AUSTRALIA & NEW ZEALAND ONLY –
HEAT PUMP WATER HEATER MODELS 953060DP,953060DV, 953079DP, 953079DV,
953101DP,953101DV, 953126DP, 953126DV, 953152DP, 953152DV, 953202DP, 953202DV
.
1. THE RHEEM WARRANTY –GENERAL
1.1 This warranty is given in Australia by Rheem Australia Pty Limited ABN 21 098 823 511
of 1 Alan Street, Rydalmere New South Wales, and in New Zealand by Rheem New
Zealand Limited of 475 Rosebank Road Avondale Auckland 1026.
1.2 Rheem offer a trained and qualified national service network who will repair or replace
components at the address of the water heater subject to the terms of the Rheem
warranty. Rheem Service, in addition can provide preventative maintenance and advice
on the operation of your water heater. The Rheem Service contact number in Australia is
131031, with Contact Centre personnel available 24 hours, 7 days a week to take your
call and if necessary to arrange a service call for during normal working hours Monday to
Friday (hours subject to change) or in New Zealand on 0800 657 335.
1.3 For details about this warranty, you can contact us in Australia on 131031 or by email at
[email protected] (not for service bookings), or in New Zealand on
0800 657 335 or by email at rhee[email protected] (not for service bookings).
1.4 The terms of this warranty and what is covered by it are set out in sections 2 and 3 and
apply to water heaters manufactured from the 1st August 2018.
1.5 If a subsequent version of this warranty is published, the terms of that warranty and what
is covered by it will apply to water heaters manufactured after the date specified in the
subsequent version.
2. TERMS OF THE RHEEM WARRANTY AND EXCLUSIONS TO IT
2.1 The decision of whether to repair or replace a faulty component is at Rheem’s sole
discretion.
2.2 If you require a call out and we find that the fault is not covered by the Rheem warranty,
you are responsible for our standard call out charge. If you wish to have the relevant
component repaired or replaced by Rheem, that service will be at your cost.
2.3 Where a failed component or cylinder is replaced under this warranty, the balance of the
original warranty period will remain effective. The replacement does not carry a new
Rheem warranty.
2.4 Where the water heater is installed outside the boundaries of a metropolitan area as
defined by Rheem or further than 25 km from either a regional Rheem branch office or an
Accredited Rheem Service Agent's / Centre’s office, the cost of transport, insurance and

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travelling between the nearest branch office or Rheem Accredited Service
Agent’s / Centre’s office and the installed site shall be the owner’s responsibility.
2.5 Where the water heater is installed in a position that does not allow safe or ready access,
the cost of that access, including the cost of additional materials handling and/or safety
equipment, shall be the owner’s responsibility. In other words, the cost of dismantling or
removing cupboards, doors or walls and the cost of any special equipment to bring the
water heater to floor or ground level or to a serviceable position is not covered by this
warranty.
2.6 This warranty only applies to the original and genuine Rheem water heater in its original
installed location and any genuine Rheem replacement parts.
2.7 The Rheem warranty does not cover faults that are a result of:
a) Accidental damage to the water heater or any component (for example: (i) Acts of
God such as floods, storms, fires, lightning strikes and the like; and (ii) third party
acts or omissions).
b) Misuse or abnormal use of the water heater.
c) Installation not in accordance with the Owner’s Guide and Installation Instructions or
with relevant statutory and local requirements in the State or Territory in which the
water heater is installed.
d) Connection at any time to a water supply that does not comply with the water supply
guidelines as outlined in the Owner’s Guide and Installation Instructions.
e) Repairs, attempts to repair or modifications to the water heater by a person other
than Rheem Service or a Rheem Accredited Service Agent / Centre.
f) Faulty plumbing or faulty power supply.
g) Failure to maintain the water heater in accordance with the Owner's Guide and
Installation Instructions.
h) Transport damage.
i) Fair wear and tear from adverse conditions (for example, corrosion).
j) Cosmetic defects.
2.8 Subject to any statutory provisions to the contrary, this warranty excludes any and all
claims for damage to furniture, carpet, walls, foundations or any other consequential loss
either directly or indirectly due to leakage from the water heater, or due to leakage from
fittings and/ or pipe work of metal, plastic or other materials caused by water temperature,
workmanship or other modes of failure.
2.9 If the water heater is not sized to supply the hot water demand in accordance with the
guidelines in the Rheem water heater literature, any resultant fault will not be covered by
the Rheem warranty.

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2.10 In New Zealand this warranty excludes to the extent permissible all implied warranties set
out in the Sale of Goods Act 1908 (New Zealand) and all guarantees set out in the
Consumers Guarantees Act 1993 (New Zealand) to the extent that the goods are acquired
for the purpose of resupply in trade consumption in the course of a process of production
or manufacture or repairing or treating in trade other goods or fixtures on land.
3. WHAT IS COVERED BY THE RHEEM WARRANTY
FOR THE WATER HEATERS DETAILED IN THIS DOCUMENT
3.1 Rheem will repair or replace a faulty component of your water heater if it fails to operate
in accordance with its specifications as follows:
What components are
covered
The period in which the
fault must appear in
order to be covered
What coverage you receive
All components
Year 1
Repair and/or replacement of the faulty
component, free of charge, including labour.
Sealed System*
components
Year 2
Repair and/or replacement of the faulty
component, free of charge, including labour.
* The Sealed System includes components that carry refrigerant only, e.g. Compressor, Condenser,
TX Valve, Receiver / Drier, Evaporator and associated pipe work.
4. ENTITLEMENT TO MAKE A CLAIM UNDER THIS WARRANTY
4.1 To be entitled to make a claim under this warranty you need to:
a) Be the owner of the water heater or have consent of the owner to act on their behalf.
b) Contact Rheem Service without undue delay after detection of the defect and, in any
event, within the applicable warranty period.
4.2 You are not entitled to make a claim under this warranty if your water heater:
a) Does not have its original serial numbers or rating labels.
b) Is not installed in Australia or New Zealand.
5. HOW TO MAKE A CLAIM UNDER THIS WARRANTY
5.1 If you wish to make a claim under this warranty, you need to:
a) Contact Rheem on 131031 in Australia or 0800 657 335 in New Zealand and provide
owner’s details, address of the water heater, a contact number and date of
installation of the water heater or if that’s unavailable, the date of manufacture and
serial number (from the rating label on the water heater).
b) Rheem will arrange for the water heater to be tested and assessed on-site.
c) If Rheem determines that you have a valid warranty claim, Rheem will repair or
replace the water heater in accordance with this warranty.

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5.2 Any expenses incurred in the making of a claim under this warranty will be borne by you.
6. THE AUSTRALIAN CONSUMER LAW
6.1 Our goods come with guarantees that cannot be excluded under the Australian Consumer
Law. You are entitled to a replacement or refund for a major failure and for compensation
for any other reasonably foreseeable loss or damage. You are also entitled to have the
goods repaired or replaced if the goods fail to be of acceptable quality and the failure does
not amount to a major failure.
6.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you
may have under the Australian Consumer Law.
7. THE CONSUMER GUARANTEES ACT 1993 (NEW ZEALAND)
7.1 Our goods come with guarantees that cannot be excluded under the Consumer
Guarantees Act 1993 (New Zealand). If the goods fail to comply with the applicable
guarantees set out under the Consumer Guarantees Act 1993 (New Zealand) being the
guarantee as to acceptable quality, the guarantee as to correspondence with description
or the guarantee as to repair and parts, or if the goods fail to comply with any express
guarantee given by Rheem, then you are entitled to a replacement or refund and for
compensation for any other reasonably foreseeable loss or damage.
7.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you
may have under the Consumer Guarantees Act 1993 (New Zealand).

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SAFETY, WARNINGS, INSTALLATION NOTES
It is important you read the following safety and warnings information.
SAFETY AND WARNINGS
•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.
•If the electrical 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 / Centre to arrange for an inspection.
•This water heater uses 400V / 230 V AC electrical power for operation of
the control systems and other electrically operated components. The
removal of the access cover(s) will expose 400V / 230 V wiring. They must
only be removed by a qualified person.
•This water heater is supplied with built in Rheem IQ Controller which
controls low and high pressure switches, low temperature cut off,
temperature safety switch and flow switch.
Additionally, the compressor is fitted with thermal overload protection,
the condenser heat exchanger is fitted with a pressure relief valve, the
heat pump is supplied with a built in ambient temperature sensor and
the storage tanks are supplied with 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 water heater will operate until a water temperature of 60°C to 65°C is
reached, depending upon the setting of the controller.
Refer to “How Hot Should The Water Be?” on page 12.
•The lever on the temperature pressure relief valve on the storage tank and
expansion control valve (if fitted) requires to be operated every six (6)
months to clear any deposits and to ensure the valve and its drain line are
not blocked.
Refer to “Relief Valves” on page 9 and “Minor Maintenance Every Six
Months” on page 19.

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•For continued safety of this water heater it must be installed, operated and
maintained in accordance with the Owner’s Guide and Installation
Instructions.
•Servicing of a water heater must only be carried out by qualified personnel.
Phone Rheem Service or their nearest Accredited Service Agent / Centre.
•Only a person qualified to install or service a water heater can drain the
water heater, if this is required.
•Do not modify this water heater.
RELIEF VALVES
Temperature Pressure Relief Valve
The storage tank connected to this water heater incorporates a temperature
pressure relief valve located near the top of the storage tank. This valve is
essential for the water heater’s safe operation.
It is possible for the valve to discharge a quantity of water through the drain line
during each heating period. This quantity should be equal to approximately 1/50
of the hot water used, as water expands by this volume when heated.
Expansion Control Valve
In many areas, including South Australia, Western Australia, New Zealand and
scaling water areas, it is mandatory an expansion control valve is fitted to the
cold water line to the water heater.
The expansion control valve will discharge the quantity of water from its drain
line during the heating period instead of the temperature pressure relief valve as
it has a lower pressure rating.
Valve Operation
Continuous leakage of water from either valve and its drain line may indicate a
problem with the water heater. Refer to “Minor Maintenance Every Six Months”
on page 20.
Warning: Never block the outlet of either valve or their drain lines for any
reason. A relief valve drain must be left open to atmosphere, and be installed in
a continuously downward direction.
In locations where water pipes are prone to freezing, the relief valve drain line
must be insulated and not exceed 300 mm in length before discharging into a
tundish through an air gap.
Operate the easing lever on the temperature pressure relief valve and expansion
control valve once every six (6) months to clear any deposits and ensure the
valve and its drain line are not blocked.

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It is very important the lever is raised and lowered gently. Refer to “Minor
Maintenance Every Six Months” on page 19.
Warning: Water discharged from the temperature pressure relief valve drain
line will be hot. Exercise care to avoid any splashing of water by standing clear
of the drain line’s point of discharge when operating either valve’s easing lever.
DANGER: Failure to operate the easing lever on the relief valve once every
six (6) months may result in the storage tank cylinder failing, or under certain
circumstances, exploding.
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 / Centre to arrange for an inspection.
The temperature pressure relief valve should be replaced at intervals not
exceeding five (5) years and the expansion control valve should be checked for
performance or replaced at intervals not exceeding five (5) years. The checking
of the valves performance or replacement should occur more frequently in areas
where there is a high incidence of water deposits. Refer to “Water Supplies” on
page 21.
INSTALLATION NOTES
This water heater must be installed:
•by a qualified person,
•in accordance with the installation instructions,
•in compliance with the Plumbing Code of Australia (PCA) and Plumbing
Standard AS/NZS 3500.4,
▪This water heater is suitable for outdoor installation only, with
adequate supply of fresh air.
▪This water heater is intended to be permanently connected to the
water mains and not connected by a hose-set. A braided flexible
hose or semi-flexible connector may be used for connection to the
water heater, where permitted by AS/NZS 3500.4.
•in compliance with the Australian / New Zealand Wiring Rules
AS/NZS 3000,
▪An isolation switch must be installed at the switchboard in the
electrical circuit to the water heater in accordance with the Wiring
Rules, so the water heater can be switched off. Refer to
“Connections – Electrical” on page 54.

11
▪The power supply wires are to be directly connected to the terminal
block, with no excess wire loops inside the front cover. The
temperature rating of the power supply wires insulation must suit
this application.
•in compliance with all local codes and regulatory authority requirements.
•in New Zealand also conforming to Clauses G12 and H1 of the New
Zealand Building Code.
Installation and commissioning requirements and details for the installing
plumber and licensed electrical worker are contained on pages 28 to 75.
Mains pressure water supply
The water heater is designed to operate at mains pressure by connecting directly
to the mains water supply.
Refer to the table on page 30 for relief valve operating pressures and maximum
supply pressures.

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ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for the purpose of heating potable water. Its use in
an application other than this may shorten its life.
MODEL TYPE
Congratulations for choosing a Rheem®
commercial air to water (A2W) heat pump
water heater. The Rheem A2W heat pump
water heater is designed for outdoor
installation only, with adequate supply of fresh
air.
HOW HOT SHOULD THE WATER BE?
The heat pump (compressor, evaporator and
condenser) will operate until a water
temperature of up to set point is reached.
To meet the requirements of the National
Plumbing Standard (AS/NZS3500.4) the
temperature of the stored water must not be
below 60C.
The factory setting is 61⁰C. The set point can
be adjusted up to 65⁰C depending on site
suitability after consulting with Rheem.
Note: Australian Standard AS 3498 and New Zealand Building Code
Clause G12 require that a water heater provides the means to inhibit the growth
of Legionella bacteria in potable water. This water heater can satisfy these
AS 3498 and Clause G12 requirements provided it is energised and the
thermostat setting is 60°C or higher, including when it is used as an in-series
booster water heater for a solar water heater.
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, the maximum permitted by the Plumbing Code of
minimum recommended
stored water
temperature
maximum
recommended supply
temperature to
bathrooms and
ensuites

ABOUT YOUR WATER HEATER
13
Australia and New Zealand Building Code Clause G12 to these areas. The risk
of scald injury will be reduced and still allow hotter water to the kitchen, laundry
and other areas requiring sanitising temperatures.
TEMPERATURE ADJUSTMENT
Set Point Quick Setting
Press ‘prg’ from the main display screen and the Set Point page will appear.
Cursor will be on the set temperature. Pressing the up and down keys will
adjust the setting in 0.1 increments. Hold down for rapid change. Press ’Enter’
to confirm change. Press ‘esc’ to return to the main display screen. Refer to
page 69 for more information.
We advise the thermostats are adjusted to the lowest temperature setting that
meets your needs, especially if there are young children or elderly people in the
premises. Refer to “Hotter Water Increases the Risk of Scald Injury” on page 12.
PRECAUTIONS
Under certain installation conditions where damage to property can occur in the
event of the water heater leaking AS/NZS 3500.4 requires the water heater 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. In New Zealand the safe tray must also meet the requirements of
Clause G12 of the New Zealand Building Code. AS/NZS 3500.4 and the NZBC
also have particular requirements when a safe tray must be installed.
Alternatively, where additional leak protection is required for installations not
defined by AS/NZS 3500.4, a suitable bund may be constructed to surround the
water heater in lieu of using a safe tray.
The water heater must be maintained in accordance with the Owner’s Guide and
Installation Instructions. Refer to “Maintenance Requirements” on page 19 and
to “Anode Inspection and Replacement” on page 20.
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.

ABOUT YOUR WATER HEATER
14
Do not use aerosols, stain removers and chemicals near the water heater
whilst it is working. Gases from some aerosol sprays, stain removers and
chemicals are corrosive to the materials used in the heat pump system.
Do not store swimming pool chemicals, household or industrial cleaners, etc.,
near the water heater.
Ensure the air inlet and outlet louvres and air flow are not obstructed in any
way at any time.
TO TURN OFF THE WATER HEATER
•Switch off the electrical supply at the isolating switch to the water heater.
•Close the isolation valves at the inlet and outlet of the water heater.
TO TURN ON THE WATER HEATER
•First, ensure the water is connected to storage tanks, the system is filled with
water and all valves between the tanks and the water heater are open.
•Switch on the electrical supply at the isolating switch to the water heater.
Note: The water heater may not turn on immediately when it is first switched on,
if it is switched on within 20 minutes to 2 hours of it having been switched off at
the isolating switch, or the heat pump has just completed a heating cycle. The
water heater will wait until the conditions for start-up are favourable in order to
protect the compressor from damage. This may take up to 20 minutes to 2 hours.
VICTORIAN CUSTOMERS
Notice to Victorian Customers from the Victorian Building Authority. 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.

ABOUT YOUR WATER HEATER
15
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 S0upplies” on page 22 If you are not sure, have
your water chemistry checked against the conditions described on pages 21
to 23.
HOW LONG WILL THE WATER HEATER LAST?
Your water heater is supported by a manufacturer’s warranty (refer to page 4).
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, temperature (inlet and outlet) and the water usage pattern.
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 your nearest Rheem Service Department or
Accredited Service Agent (or Service Centre in NZ) to arrange for an inspection.

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HOW YOUR WATER HEATER WORKS
The Rheem commercial air to water heat pump is an instantaneous type and
does not have an integral storage cylinder. The unit is designed to be installed
outdoors, with adequate supply of fresh air. The water heater’s evaporator
absorbs heat from the surrounding air and transfers this heat into the water. A
circulator transfers the heated water to a bank of storage tanks.
When hot water is drawn off and cold water enters the storage tanks, a remote
thermostat activates the fan, compressor and circulating pump of the water
heater. Air is drawn in through the inlet on the side of the water heater and then
past the evaporator, where heat is transferred from the air to a refrigerant fluid.
The fluid is compressed and passes to the condenser (heat exchanger) where
heat is transferred into the water. The pump circulates water from the bottom of
the storage tanks through the heat exchanger and the heated water is circulated
back into the storage tanks. The fan discharges the cooled air through the fan
grilles on the top of the water heater. This process continues until the water in
the storage tanks reaches the set temperature.
Even on cold days, heat is drawn from the surrounding air. The heat pump will
operate most efficiently at temperatures between a minimum of 0°C and
maximum of 45°C. The efficiency of the water heater is relative to the
surrounding air temperature and the incoming water temperature.
Automatic safety controls are fitted to the water heater to provide safe and
efficient operation.
AUXILIARY BOOST OPERATION
The water heater can control an auxiliary heating source if the ambient
temperature falls below 0oC or if 50% or more of the water heaters refrigeration
circuits are in fault mode.
OPERATION AT LOW AMBIENT TEMPERATURE
As the ambient temperature falls below 5oC, the controller will automatically set
back the target set point, measured at the bottom of the storage tank, relative to
the ambient temperature, to a value set as the minimum. The factory default
minimum set back is 60oC which correlates to an ambient temperature of 0oC.
As the ambient temperature increases, the set point will increase accordingly
until the normal set point is achieved. It is important to note that the sizing of the
system ensures hot water is delivered to the building even though the bottom of
the tank may be at a lower set point, and heating to above 60oC is ensured every
day in accordance with AS3498.
Setting back the target set point allows the heat pump to operate reliably at lower
ambient temperatures.

HOW YOUR WATER HEATER WORKS
17
Should the ambient temperature continue to fall below 0C, or the heat pump has
operated below 5oC for a selected period of time, the heat pump will de-activate
and activate auxiliary heating.
An auxiliary gas or electric water heater will be activated and will operate in until
the air temperature reaches 5C.
OPERATION IN FAULT MODE
If fitted, the auxiliary booster will operate instead of the heat pump if the heat
pump is in fault.
The auxiliary booster will also operate instead of the heat pump if 50% or more
of the water heaters refrigeration circuits are in fault mode.
The auxiliary boost will operate until the set temperature is reached. The auxiliary
boost should be set to 65°C.
The auxiliary boost will remain active until the water heater fault is cleared.
Warning: Rheem will not be responsible for higher utility bills due to
excessive use of auxiliary boost heater. It is the customers’responsibly
to monitor the system regularly for its correct operation. Rheem
recommends monitoring via BMS. Modbus and BACnet interface cards
are supplied separately.
THERMAL CUT OUT
The refrigeration circuit is protected by thermal sensors. These will activate a
thermal cut out in the event of excessive heat in the refrigeration system.
If the thermal cut out has activated, the heat pump will not operate for a period
of 20 minutes to 2 hours. The water heater will make two more attempts to start
up. If the thermal cut out is tripped again after the third attempt, the system will
enter lock out and the alarm contacts will close. If connected to a BMS, this will
alert the user that the unit is not operating.
The lockout condition can be manually reset by switching the power to the water
heater off and then on.
CONTROL FUNCTIONALITY
A timer can be set through the heat pump control panel to limit the hours of
operation of the water heater (e.g. to reduce noise at night).
The operation of the heat pump can also be controlled by setting up tariff option
on the control panel to manage operating costs.

HOW YOUR WATER HEATER WORKS
18
Note: depending on the booster configuration there may be insufficient stored
energy available for the next peak period if the system is not up to temperature.
Remember, even on cloudy and cold days your heat pump water heater will
heat your stored water.
SUPERIOR MONITORING
The A2W Heat Pump System is supplied with 9 sensors:
1. Tank temperature sensor
2. Building flow temperature sensor
3. Water inlet temperature sensor
4. Water outlet temperature sensor
5. Refrigerant suction side temperature (superheat)
6. Suction pressure transducer
7. Discharge pressure transducer
8. Ambient air temperature sensor
9. Evaporator coil sensor
The output of these sensors are displayed on the user friendly control panel to
ensure correct system operation.
The system can be connected to BMS. Modbus RS485, BACnet MS-TP or
BACnet TCP/IP (Ethernet) is available via interface cards supplied by Rheem.
Contact Rheem for further information on BMS.

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MAINTENANCE REQUIREMENTS
MINOR MAINTENANCE EVERY SIX MONTHS
It is recommended minor maintenance be performed every six (6) months. Minor
maintenance can be performed by a responsible officer.
The minor maintenance includes:
•Operate the easing lever on the temperature pressure relief valve. It is
very important the lever is raised and lowered gently. Refer to “Relief
Valves” on page 9.
Warning: Water discharged from the temperature pressure relief
valve drain line will be hot. Exercise care to avoid any splashing of water
by standing clear of the drain line’s point of discharge when operating
the valve’s easing lever.
•Operate the easing lever on the expansion control valve (if fitted). It is
very important the lever is raised and lowered gently. Refer to “Relief
Valves” on page 9.
•Check the condensate drain and safe tray drain (if one is installed) is not
blocked.
ANNUAL SERVICE
It is recommended the commercial heat pump be serviced annually, to retain
optimum performance. Servicing must be performed by a suitably qualified
person.
The annual service includes:
1. Check the sensors are fully installed into thermal wells.
2. Check for leaks at all fittings.
3. Check for signs of excessive corrosion on storage tank(s) jacket(s) and heat
pump casing.
4. Check for sludge build up and if necessary drain and flush storage tank(s).
5. Clear hot water pump impellor and ensure free rotation.
6. Check condensate drain for blockages –clear if necessary.
7. Clean blockages and debris from evaporator fins, fan blades, grilles and
louvres.
8. Isolate power to heat pump and check all electrical connections for signs of
overheating due to poor connection.

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9. Check for vibration or excessive noise from compressor, fans and hot water
pump.
10. Check refrigerant pressures and adjust refrigerant charge if required.
11. Visually check system for any potential problems.
12. Confirm correct system operation.
13. Operate temperature and pressure relief valve and expansion control valve.
Refer to page 30.
FIVE YEAR SERVICE
1. As per annual service.
2. Inspect and if required, replace storage tank(s) anode(s). If the anode is not
replaced, it should be replaced within three years of this service.
3. Check operation of defrost solenoid valve by manually operating the valve.
4. Replace temperature and pressure relief valve or expansion control valve.
Refer to Service manual for more information.