Rheem RT1000C6 Technical Document

This storage tank must be installed and serviced by a qualified person.
Please leave this guide with the householder.
Owner’s Guide
and
Installation Instructions
Commercial Carbon Steel
Indirect Storage Tank

PATENTS
This storage tank may be protected by one or more patents or registered designs
in the name of Rheem Australia Pty Ltd.
TRADEMARKS
®Registered trademark of Rheem Australia Pty Ltd.
TM Trademark of Rheem Australia Pty Ltd.
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 publication.
WARNING: Plumber –Be Aware
The primary flow and return pipes between the storage tank(s) and the primary water heating source,
including the solar hot and solar cold pipes between the solar storage tank(s) and the solar collectors,
MUST BE of copper or metallic pipe. All compression fittings must use brass or copper olives.
The full length of the primary flow and return pipes MUST BE insulated.
The insulation must:
be of a type suitable for the application and capable of withstanding the temperature of the water
generated by the primary water heating source
The specification of the chosen insulation material should be checked with the insulation
manufacturer prior to installation as different materials may vary in temperature tolerance.
Closed cell type or equivalent insulation used between the storage tank(s) and solar collectors, if
this storage tank is part of a solar water heater installation, must be able to withstand the
temperature of the water generated by the solar collectors under stagnation conditions. Refer to
the installation instructions provided with the solar controller for full details on the insulation
requirements of the solar hot and solar cold pipes.
be at least 13 mm thick, however thicker insulation may be required to comply with the
requirements of AS/NZS 3500.4
be weatherproof and UV resistant if exposed
be fitted up to and cover the connections on both the storage tank(s) and the primary heating
source.
The insulation will reduce pipe heat losses and also assist in avoiding accidental contact with the pipe
work as high temperature water can flow from the primary heating source and the storage tank(s).
In addition, the insulation on the solar hot and solar cold pipes must also:
extend through any penetrations in the eaves, ceiling and roof
cover valves and fittings in the solar hot and solar cold pipe work
Note: Failure to observe these requirements also increases the risk of freeze damage.
The insulation is essential to assist in providing freeze protection and will offer corrosion protection to
a metal roof against water runoff over the copper pipe.
Uninsulated pipe work, including concealed in cavities and roof spaces or where it may be in contact
with a metal roof, may lead to freeze damage. The system has NO WARRANTY for freeze damage if
the solar hot and solar cold pipes are not insulated in accordance with the installation instructions.
Plumber: It is important to refer to and read in full the complete “Warning: Plumber – Be Aware” statement
commencing on page 19.

3
CONTENTS
RESPONSIBLE OFFICER - We recommend you read pages 4 - 10.
The other pages are intended for the installer but may be of interest.
Contents....................................................................................................................................... 3
About Your Storage Tank ........................................................................................................... 4
Regular Care ................................................................................................................................ 7
Water Supplies............................................................................................................................. 9
Save A Service Call ................................................................................................................... 10
Installation.................................................................................................................................. 11
Insulation - Installation Instructions........................................................................................ 14
Connections –Plumbing .......................................................................................................... 17
Multiple Installations................................................................................................................. 20
Connections –Electrical........................................................................................................... 22
Corrosion Inhibitor.................................................................................................................... 24
Commissioning.......................................................................................................................... 26
Draining The Storage Tank....................................................................................................... 27
Rheem Australia Storage Tank Warranty................................................................................ 31

4
ABOUT YOUR STORAGE TANK
STORAGE TANK APPLICATION
This storage tank is designed for the purpose of storing water treated with a corrosion inhibitor and is not
designed for use with potable water. Its use in an application other than this may shorten its life.
MODEL TYPE
The Rheem®Commercial hot water storage tank you have chosen can be installed indoor or outdoor,
depending on the type of insulation selected. Aluminium clad insulation is suitable for indoor or outdoor
installation. PVC outer cover is suitable for indoor installation only (not available in Australia or New Zealand).
Heat transfer fluid is stored in a carbon steel cylinder and heated by an external primary heating source, or
via the two flanges that allow the fitment of auxiliary heating such as heat exchange coils (not supplied) or an
electric heating unit bundle. The temperature is controlled by the thermostat(s) on the heating source.
Automatic safety controls must be fitted to the primary heating source to provide safe and efficient operation.
CLOSED CIRCUIT
The storage tank is designed to operate at low pressure in a closed loop circuit, with the use of a heat
transfer fluid. The supply pressure must not exceed that shown on page 12.
HOW HOT SHOULD THE WATER BE?
The storage tank is designed for a maximum allowable water
temperature of 90°C, unless operated as a permanently vented
cylinder. Refer to the installation instructions supplied with the
primary heating source plant for further information on water
temperatures.
Note: AS 3498 requires that a water heater provides the means to
inhibit the growth of Legionella bacteria in potable water.
This storage tank is not designed to contain potable water. The
requirement to provide the means to inhibit the growth of Legionella
bacteria must be fulfilled by the secondary heating source. Refer to
installation instructions of the secondary heating source.
HOTTER WATER INCREASES THE RISK OF SCALD INJURY.
This storage tank 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 bathing and public areas when this storage tank is installed. This will
keep the water temperature below 50°C or the maximum permitted by AS/NZS 3500.4 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
We advise the thermostats of the primary heating plant 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 4
maximum allowable
thermostat setting of primary
heating source (90°C)
minimum recommended
thermostat setting of
secondary heating source
maximum recommended
supply temperature to
bathrooms, ensuites and
public areas

ABOUT YOUR STORAGE TANK
5
Warning
This storage tank is only intended to be operated by persons who have the experience or the knowledge and
the capabilities to do so. This storage tank 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 storage tank.
SAFETY
This storage tank is supplied with a combination temperature pressure relief valve. When installed as
instructed in this manual, this valve has a rating of 575 kW. If the primary heating source has an output
exceeding this valve, additional relief valves are required. The valve(s) must not be tampered with or
removed. The storage tank and its primary heating source must not be operated unless each of these
devices is fitted and is in working order.
This storage tank is designed to be used in a closed circuit. Supplementary pressure relief devices such
expansion vessels, permanently venting the cylinder or using as a drain back solar system must be included
in the system design.
If a remote thermostat (Tankstat) is fitted to the storage tank and the electrical conduit 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 heating system 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.
PRECAUTIONS
Where damage to property can occur in the event of the storage tank leaking, the storage tank 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 storage tank must be maintained in accordance with the Owner’s Guide and Installation Instructions.
Refer to “Regular Care” on page 7.
If this storage tank 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 storage tank 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 STORAGE TANK
If it is necessary to turn off the storage tank:
Turn off the primary water heating plant and switch off the electrical supply at the isolating switch to the
circulating pump(s).
Close the cold inlet isolation valve on the cold inlet line to the storage tank(s) to shut down the entire
system, or;
Close the isolation valves on the cold, flow / return and hot branches to shut down an individual storage
tank in a bank.
TO TURN ON THE STORAGE TANK
Open the isolation valves fully on the cold, flow / return and hot water branches to the storage tank(s)
installed in a bank.
Open the cold inlet isolation valve on the cold inlet line to the storage tank(s). Air will be forced out of the
System.
Switch on the electrical supply at the isolating switch to the circulating pump(s) and turn on the primary
water heating plant.

ABOUT YOUR STORAGE TANK
6
HOW DO I KNOW IF THE STORAGE TANK IS INSTALLED CORRECTLY?
Refer to the Application Guide for the most appropriate system configuration. Further information is also
provided on pages 20 to 21. The storage tank must be installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standard AS/NZS 3500.4 and all local codes and regulatory authority requirements.
In New Zealand the installation must also conform with the New Zealand Building Code.
VICTORIAN CUSTOMERS
Notice to Victorian Customers from the Victorian Plumbing Industry Commission. This storage tank 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 storage tank and ask for your Compliance Certificate.
DOES THE WATER CHEMISTRY AFFECT THE STORAGE TANK?
The storage tank is designed to store a heat transfer liquid and must be treated to prevent corrosion. The
system has either been supplied with the amount of preparation chemicals and corrosion inhibitor required
or alternatively can be sourced locally. These are to be applied in accordance with the manufacturers’
instructions. Refer to SDS sheets supplied with pre-treatment and corrosion inhibitor. Refer to Treating the
Storage Tank on page 24.
Some water chemistries may have detrimental effects on the storage tank, its components and fittings. Refer
to “Water Supplies” on page 9.
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 9 to 9.
HOW LONG WILL THE STORAGE TANK LAST?
The storage tank is supported by a manufacturer’s warranty (refer to page 31). There are a number of factors
that will affect the length of service the storage tank will provide. These include but are not limited to the fluid
chemistry, the fluid pressure, the fluid temperature (inlet and outlet) and the water usage pattern. Refer to
“Precautions” on page 5.

7
REGULAR CARE
MINOR SIX MONTH MAINTENANCE
It is recommended minor maintenance be performed every six months by a responsible officer.
The minor maintenance includes:
Check the water chemistry of the closed circuit fluid
Check the level of the closed circuit fluid
Check operation of any fill valves and/or expansion vessels
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 8.
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.
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 storage tank. 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 relief valve(s), are not
included in the Rheem warranty. A charge will be made for this work. Only genuine replacement parts should
be used on this storage tank.
The major service includes the following actions:
Replace the temperature pressure relief valve.
Check the water chemistry of the closed circuit fluid
Check the level of the closed circuit fluid
Check operation of any fill valves and/or expansion vessels
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 storage tank 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 heating source, hot water may not
be available for a while.

REGULAR CARE
8
TEMPERATURE PRESSURE RELIEF VALVE
This valve is near the top of the storage tank and is essential for its
safe operation. This valve is designed to only relieve excess thermal
energy or an unanticipated build-up of pressure. In a fully flooded
closed loop system an appropriately sized expansion vessel must be
installed to accommodate for the expansion of heat transfer liquid. It
must be sized to accommodate the pressure of the full capacity of
the system and its thermal expansion. In a drain back design the
system is not filled to 100% of its capacity, therefore an expansion
vessel is not required. The heat transfer liquid will expand into the
remaining empty capacity of the system.
The relief valve may discharge some fluid on first heat up. Continued
leakage of fluid from the valve and its drain line may indicate a
problem with the water heater (refer to “Temperature Pressure
Relief Valve Running” on page 10).
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 Six
Month Maintenance” on page 7. It is very important the lever is raised and lowered gently.
Warning: Failure to do this may result in the storage tank cylinder failing.
Warning: Exercise care to avoid any splashing of fluid, as fluid 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 fluid does not flow freely from the drain line when the lever is lifted, then the storage tank must be checked.
Phone Rheem Service or their nearest Accredited Service Agent.
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 9).
Storage
tank
Drain
line
Lift until fluid
flows from the
drain line –
lower gently

ERROR! REFERENCE SOURCE NOT FOUND.
9
WATER SUPPLIES
This water heater must be installed in accordance with this advice to be covered by the Rheem warranty.
The storage tank is designed to store a heat transfer liquid and must be treated to prevent corrosion. Refer to
Treating the Storage Tank on page 24, however, there are some known water chemistries which can have
detrimental effects on the water heater and its operation and / or life expectancy.
A list of postcodes is available on the Rheem website (www.rheem.com.au) indicating known areas where the steel
cylinder is not covered by the Rheem warranty due to the water chemistry of the area. The list is not necessarily
exhaustive and there may be areas outside of these postcodes where the steel cylinder is not covered by the
Rheem warranty due to the water chemistry of the area.
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, which
takes precedence over the list of postcodes, for the Rheem warranty to apply.
PH
pH is a measure of whether the water is alkaline or acid. In an acidic or very alkaline water supply, the water can
attack steel parts and cause them to fail.
Where the pH is less than 6.0 or greater than 9.5, the Rheem warranty does not apply to the steel cylinder. 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. This may result in pH of less than 6.0. It is recommended an analysis on the water from
a rainwater tank be conducted prior to connecting this type of water supply to a water heater with a steel cylinder.
SATURATION INDEX
The saturation index (SI) is used as a measure of the water’s corrosive or scaling properties. The saturation index
figures stated are calculated using a water temperature of 80°C.
In a corrosive water supply, the water can attack copper parts and cause them to fail.
In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface.
Where the saturation index exceeds +0.40, the water is very scaling. Where the saturation index exceeds +0.80,
the Rheem warranty does not apply to the steel cylinder.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the water.
TOTAL DISSOLVED SOLIDS
The steel cylinder is only covered by the Rheem warranty when the total dissolved solids (TDS) content in the water
is less than 600 mg / L.
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.
SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING WARRANTY
The water heater and its components are 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 on the components listed below:
Water Chemistry
Component
pH < 6.0 or > 9.5
water heater cylinder
Total Dissolved Solids (TDS) > 600 mg / L
water heater cylinder
Saturation Index (SI) > +0.4
water heater cylinder
temperature pressure relief valve
Saturation Index (SI) > +0.8
water heater cylinder

10
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)
Are you using more hot water than you think?
Are outlets (especially the showers) 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 hot water usage.
Have your plumber fit a flow control valve to each shower outlet to
reduce water usage.
Temperature pressure relief valve running
Is the relief valve discharging too much water? Refer to
“Temperature Pressure Relief Valve Running” on page 10.
Thermostat setting
Ensure the thermostat setting of the primary heating source is
appropriate. You may choose to have your electrician adjust the
thermostats upwards to gain additional hot water capacity.
Warning: Hotter water increases the risk of scald injury.
Water heater size
Do you have the correct size water heater or sufficient storage for your requirements? The sizing guide in
the Rheem sales literature and on the Rheem website (www.rheem.com.au) suggests average sizes that
may be needed.
TEMPERATURE PRESSURE RELIEF VALVE RUNNING
Normal Operation
This valve is designed to only relieve excess thermal energy or an
unanticipated build-up of pressure. In a fully flooded closed loop
system an appropriately sized expansion vessel must be installed
to accommodate for the expansion of heat transfer liquid. It must
be sized accordingly to accommodate the pressure of the full
capacity of the system and its thermal expansion. In a drain back
design the system is not filled to 100% of its capacity, therefore an
expansion vessel is not required. The heat transfer liquid will
expand in to the remaining empty capacity of the system.
Continuous dribble
Try gently raising the easing lever on the relief valve for a few
seconds (refer to “Temperature Pressure Relief Valve” on page 8).
This may dislodge a small particle of foreign matter and clear the
fault. Release the lever gently.
The relief valve may discharge some fluid on first heat up.
Continued leakage of fluid from the valve and its drain line may indicate a problem with the water heater
Heavy flows of hot fluid or steam
The primary heating source must be shut down and the energy source isolated. Phone Rheem Service
or their nearest Accredited Service Agent to arrange for inspection.
Warning: Never replace the relief valve with one of a higher pressure rating.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE,
PHONE RHEEM SERVICE OR THEIR NEAREST ACCREDITED SERVICE AGENT