Rheem 991, 9W1, 992 Installation Manual
Owner’s Guide
and
Installation Instructions
Electric Domestic
Water Heater
This water heater must be installed and serviced by a qualified person.
Please leave this guide with the householder.
This water heater may be protected by one or more patents or registered designs
PATENTS
in the name of Aquamax Australia Pty Limited or Rheem Australia Pty Ltd.
®
Registered trademark of Aquamax Australia Pty Limited or Rheem Australia Pty Ltd.
TM
Trademark of Aquamax Australia Pty Limited or Rheem Australia Pty Ltd.
TRADEMARKS
Note: Every care has been taken to ensure the accuracy in preparation of this
publication. No liability can be accepted for any consequences
which may arise as a result of its application.
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
Maintenance Requirements ...................................................... 10
Water Supplies ........................................................................... 13
Save A Service Call ................................................................... 17
Installation .................................................................................. 20
Connections – Plumbing ........................................................... 30
Connections – Electrical ........................................................... 35
Commissioning .......................................................................... 37
Draining The Water Heater........................................................ 38
Warranty ..................................................................................... 41
3
minimum thermostat
setting and minimum
recommended stored
water temperature.
top heating unit
thermostat setting on a
twin element model
(not adjustable)
maximum
recommended supply
temperature to
bathrooms and ensuites
maximum thermostat
setting
(080 to 400 models)
maximum thermostat
setting
(050 models)
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
Aquamax® water heater models are available with either a single heating unit or
with twin heating units (refer to “Single Element Model” on page 7 and “Twin
Element Model” on page 7). The water heaters are suitable for either indoor or
outdoor installation, or indoor only if it is has a supply cord and plug.
Water is stored in a vitreous enamel lined steel cylinder and heated by the
electric immersion heating unit. The thermostat controls the temperature.
Automatic safety controls are fitted to the water heater to provide safe and
efficient operation.
The water heaters have connections on either side of the tank. Depending on
the model, it may have caps or brass plugs on one side of the tank. The plugs
and caps block off the alternative connection points and are not to be tampered
with or removed.
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.
HOW HOT SHOULD THE WATER BE?
The water heater features an adjustable
thermostat, which allows you to choose the
most suitable temperature for your hot
water needs. Refer to “Temperature
Adjustment” on page 5.
To meet the requirements of the National
Plumbing Standard the temperature of the
stored water must not be below 60°C.
ABOUT YOUR WATER HEATER
4
ABOUT YOUR 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 at the bathroom and ensuite. The risk of scald
injury will be reduced and still allow hotter water to the kitchen and laundry.
THERMOSTAT
The thermostat automatically controls the electricity supply to the heating unit
so a constant temperature is maintained. The thermostat and its protective over
temperature cut out is mounted inside the front cover of the water heater. There
is no need to switch the water heater off when it is not in use, except when you
are on an extended holiday. The thermostat is fully automatic and power is only
used when heating is required.
TEMPERATURE ADJUSTMENT
The water heater features a tradesperson adjustable thermostat, which allows
you to select the most suitable temperature for your hot water needs. This
requires a licensed tradesperson to make any temperature adjustments. The
thermostat has a maximum temperature setting of 70°C (75°C for 050 models)
and a minimum temperature setting of 60°C.
We advise you have your electrician adjust the thermostat to the lowest
temperature setting that meets your needs, especially if there are young
children or elderly people in your home. Refer to “Hotter Water Increases the
Risk of Scald Injury” on page 5.
5
ABOUT YOUR WATER HEATER
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 power for the electrically operated
components. The removal of the front cover(s) will expose 240 V wiring. It must
only be removed by a qualified person.
Take care not to touch the power plug on a water heater fitted with a power
supply cord and plug with wet hands.
SAFETY
This water heater is supplied with a thermostat, an over-temperature cut-out,
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 power supply cord, plug or electrical conduit to the water heater is
damaged, it must be replaced by a qualified person in order to avoid a hazard.
The power supply cord and plug must be replaced with a genuine replacement
part available from Aquamax. Phone Aquamax Service 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 Aquamax 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.
6
ABOUT YOUR WATER HEATER
SINGLE ELEMENT MODEL
This type of water heater has one heating unit
with its own thermostat. The heating unit is at
the base of the water heater.
Continuous electricity supply
This type of connection is suited to where
the storage capacity is less than the
normal daily usage.
Off-Peak electricity supply
This type of connection will only allow
heating to occur during set hours. A
volume of water sufficient for the day’s
total use is heated and stored. This type of
heating will be more economical due to
reduced tariffs by the electricity authority.
TWIN ELEMENT MODEL
This type of water heater has two heating units, each with its own thermostat.
One heating unit is at the base of the water heater and the other near the top.
Bottom heating unit
During normal operation this heating unit
supplies all the hot water.
Top heating unit (Booster)
This heating unit only operates during
periods of high demand to provide an
additional supply of heated water.
Electrical connection
The two heating units are wired for nonsimultaneous operation, so that only one
heating unit can operate at a time. The
bottom heating unit is usually connected to
an Off-Peak (overnight) or time controlled
electricity supply and the top heating unit
to a continuous supply. Some electricity
suppliers allow both heating units to be
metered at the Off-Peak or controlled tariff.
NOTE: Power must be available to the top heating unit circuit at all times
for this water heater to operate as designed.
7
ABOUT YOUR WATER HEATER
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 “Maintenance Requirements” on page 10
and to “Anode Inspection and Replacement” on page 14.
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.
TO TURN OFF THE WATER HEATER
If you plan to be away from home for only a few nights, we suggest you leave
the water heater switched on.
If it is necessary to turn off the water heater:
Switch off the electrical supply at the isolating switch to the water heater.
Unplug the power supply cord from the power outlet (power supply cord
model only).
Close the cold water isolation valve at the inlet to the water heater.
TO TURN ON THE WATER HEATER
Open the cold water isolation valve fully on the cold water line to the water
heater.
Plug in the power supply cord at the power outlet (power supply cord model
only).
Switch on the electrical supply at the isolating switch to the water heater.
GOING ON HOLIDAY?
If you plan to be away from home for one or two nights, we suggest you leave
the water heater switched on. However, if you plan to stay away more than a
few nights, conserve energy by switching the water heater off at either the
switchboard or isolating switch.
8
ABOUT YOUR WATER HEATER
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 20 to 27. 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 to the New Zealand Building
Code.
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 16.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer’s warranty (refer to page 41).
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 8.
9
MAINTENANCE REQUIREMENTS
MAJOR SERVICE EVERY FIVE YEARS
It is recommended a major service be conducted on the water heater every
five (5) years.
Warning: Servicing of a water heater must only be carried out by qualified
personnel. Phone Aquamax Service.
Note: The major service and routine replacement of any components, such as
the anode and relief valve(s), are not included in the Aquamax warranty. A
charge will be made for this work. Only genuine replacement parts should be
used on this water heater.
The major service includes the following actions:
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 14).
Check the electric heating unit for excessive calcium build up or corrosion
and replace if necessary.
Visually check the unit for any potential problems.
Inspect all connections.
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.
10
MAINTENANCE REQUIREMENTS
MINOR MAINTENANCE EVERY SIX MONTHS
It is recommended minor maintenance be performed every six (6) months.
Minor maintenance can be performed 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 11.
Check the drain line from the safe tray (if one is installed) is not blocked.
EXPANSION CONTROL VALVE
In many areas, including South Australia, Western Australia 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 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. Refer to “Minor Maintenance Every Six Months” on page 11. It is very
important the lever is raised and lowered gently. If water does not flow
freely from the drain line when the lever is lifted, then the water heater should
be checked by Aquamax Service. The expansion control valve should be
checked for performance or replaced at intervals not exceeding five (5) years,
or more frequently in areas where there is a high incidence of water deposits.
11
MAINTENANCE REQUIREMENTS
lift until water
flows from the
drain line –
lower gently
drain
line
water
heater
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. Refer to “Minor
Maintenance Every Six Months” on
page 11. It is very important the lever is
raised and lowered 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 Aquamax Service to arrange for an
inspection.
The temperature pressure relief valve should be replaced at intervals not
exceeding five (5) years, or more frequently in areas where there is a high
incidence of water deposits (refer to “Water Supplies” on page 13).
12
WATER SUPPLIES
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)
This water heater must be installed in accordance with this advice to be
covered by the Aquamax 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 Aquamax warranty to apply.
ANODE
The vitreous enamel lined cylinder of the water heater is only covered by the
Aquamax 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 Aquamax warranty. In addition, the use of an
incorrect colour coded anode may shorten the life of the water heater cylinder.
The correct colour coded anode must be selected and fitted to the water heater
in accordance with the following advice and the Anode Selection chart on
page 14 for the Aquamax warranty to apply to the water heater cylinder.
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.
13
WATER SUPPLIES
(3570)
Green
150
2500
600
400
TOTAL DISSOLVED SOLIDS (TDS) mg/L
(CONDUCTIVITY - μS/cm)
(215)
(570)
(860)
Black
40
(60)
Blue
Blue
ANODE SELECTION
Above 2500 mg/L,
no warranty applies
to a vitreous-
enamel-lined water
heater cylinder
Warranty applies to a vitreous-enamel-lined
water heater cylinder if the correct coloured
anode is used for the TDS of the water
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.
For water supplies which are either softened or desalinated, or where the water
supply may alternate between a water tank and a reticulated public supply or
another supply, or where there is a variable supply (e.g. from a bore or public
reticulated supply from various water sources), the anode must be inspected
(and replaced if there is any sign of depletion) within 5 years of its installation.
For all water supplies, if the anode is not replaced during a major service (refer
to “Major Service Every Five Years” on page 10) then the maximum time after
installation when the anode should be replaced for this electric water heater is
8 years.
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.
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.
14
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