Rheem Solar Premier Loline 590160 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
Solar Premier Loline 590160
Storage Tank
WARNING: Plumber –Be Aware
Use copper pipe ONLY. Plastic pipe MUST NOT be used.
It is a requirement of a solar water heater installation that all pipe work be in
copper and not plastic, due to the effects of high water temperatures.

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.
WARNING: Plumber –Be Aware
The solar hot and solar cold pipes between the solar storage tank and the solar collectors MUST BE of
copper. All compression fittings must use brass or copper components.
The full length of the solar hot and solar cold pipes MUST BE insulated.
The insulation must:
be of a closed cell type or equivalent, suitable for a solar water heating application and capable of
withstanding the temperature of the closed circuit fluid generated by the solar collectors under
stagnation conditions
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.
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
extend through any penetrations in the eaves, ceiling and roof
cover valves and fittings in the solar pipe work
be fitted up to and cover the connections on both the solar storage tank and the solar collectors.
The insulation will offer protection to a metal roof against corrosion due to water running off the copper
pipes, assist in avoiding accidental contact with the solar pipe work as high temperature closed circuit
fluid can flow from the solar collectors to the solar storage tank, and also reduce pipe heat losses.
The highest point of the solar hot and solar cold pipes must be where they connect to the solar
collectors. There MUST BE a continuous fall of a minimum 5° (1 in 10 grade) in the pipe work from
the solar collectors to the solar storage tank for efficient and complete drain back of the closed circuit
fluid to occur.
The system has NO WARRANTY for freeze damage if there is not a continuous fall in the solar hot and
solar cold pipes, or they are not insulated in accordance with the installation instructions, or the closed
circuit fluid has been incorrectly mixed.
The insulated copper pipe work:
should be fixed at suitable locations to prevent or reduce the possibility of noise from water hammer
and vibration from occurring
is not to be placed or installed in contact with plastic pipe work.
Likewise, plastic pipe work is not to be placed or installed in contact with the insulated copper pipe work
after the solar circuit is installed.
Plastic pipe MUST NOT be used, as it will not withstand the temperature of the closed circuit fluid
generated by the solar collectors under stagnation conditions. Extremely high closed circuit fluid
temperatures up to 150°C for non-selective surface collectors and greater than 200°C for selective
surface collectors can be generated under these conditions. Plastic pipe cannot withstand these
temperatures and MUST NOT be used. Failure of plastic pipe can lead to the release of high
temperature closed circuit fluid and cause severe water damage and flooding.
The pressure applied to the solar circuit and solar collectors during a pressure test of a closed circuit
system MUST NOT exceed 200 kPa, otherwise damage may result. Refer to “Pressure Testing” on
page 38.

3
CONTENTS
HOUSEHOLDER –We recommend you read pages 4 to 20.
The other pages are intended for the installer but may be of interest.
About Your Water Heater............................................................................................................ 4
Maintenance Requirements...................................................................................................... 11
Water Supplies........................................................................................................................... 14
Save A Service Call................................................................................................................... 17
Installation –Solar Storage Tank............................................................................................. 21
Installation –Solar Collector.................................................................................................... 33
Connections –Plumbing .......................................................................................................... 39
Connections –Electrical........................................................................................................... 44
Commissioning.......................................................................................................................... 47
Draining The Water Heater ....................................................................................................... 60
Warranty..................................................................................................................................... 62
Warning: Upon completion of the installation and commissioning of the water heater, leave
this guide with the householder or responsible officer. DO NOT leave this guide inside of the
cover of the water heater, as it may interfere with the safe operation of the water heater or ignite
when the water heater is turned on.

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.
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 24, a pressure limiting valve must be
fitted. The supply pressure should be greater than 350 kPa for true mains pressure operation to be achieved.
The supply pressure should be greater than 140 kPa for the rated flow and performance of a Rheem in-series
gas booster to be achieved.
MODEL TYPE
Your Rheem®Premier Loline solar water heater is designed for the solar collectors to
be roof mounted and the solar storage tank to be installed at ground or floor level. The
solar storage tank is suitable for installation either indoor or outdoor and with either
one only CSA2013 or two only NPT200 or LCS solar collectors. The system is suitable
for installation in areas subject to frost or freeze conditions. Freeze conditions occur
below 6°C.
This solar water heater is designed to be installed with either a Rheem continuous
flow 874820 or 874826 in-series gas booster mounted onto the storage tank or
installed remotely. If the in-series gas booster is mounted onto the storage tank, then
it is suitable for outdoor installation only.
The solar water heater may be installed with another suitable type of remotely installed
in-series continuous flow or storage booster. If the in-series water heater is other than
aRheem continuous flow 874820 or 874826 in-series gas booster, then the references
to the in-series gas booster in this guide may not be applicable to the installation. For
information relating to the function and operation of the in-series water heater, refer to
the Owners Guide and Installation Instructions supplied with the water heater.
SOLAR OPERATION
The Rheem Premier Loline solar water heater has its vitreous enamel lined solar
storage tank installed at ground or floor level, remotely from the solar collectors. This
water heater is a closed circuit solar hot water system with a heat exchanger in the
solar storage tank.
The heat exchanger is filled with closed circuit fluid and is connected to the solar
collectors by insulated copper pipe work forming a closed circuit. The closed circuit
fluid is a solution of a blue, non-toxic food grade propylene glycol concentrate mixed
with water. The closed circuit concentrate is used to lower the freezing temperature of
the closed circuit fluid and provides protection against freezing.
As the sun heats the solar collectors, the increase in temperature activates the pump.
The pump switches on whenever the solar collectors are hotter than the water in the
tank and the water requires heating. The pump moves the closed circuit fluid from the
solar storage tank heat exchanger through an insulated copper pipe to the solar
collectors to be heated by the sun’s energy and then back to the heat exchanger. Heat
transfers from the closed circuit fluid in the heat exchanger to the water stored in the
solar storage tank.
This process continues while solar energy is available and until the water in the solar storage tank reaches a
temperature of approximately 75°C. The pump is then deactivated and the closed circuit fluid in the solar
collectors and solar pipe work drains back into the heat exchanger in the solar storage tank.
The closed circuit provides protection to the solar collectors and solar circuit in harsh water areas. The drain
back principle provides protection to the system in freezing conditions.
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.

ABOUT YOUR WATER HEATER
5
GAS BOOSTING OPERATION
Water stored in the solar storage tank passes through the in-series gas booster when a hot tap is opened. The
in-series gas booster is for heating the water at times of low solar energy gain, such as during cloudy or rainy
weather, or during colder months.
Solar heated water can reach temperatures up to 75°C in the solar storage tank. When the solar heated water
temperature is 58°C or above, the in-series gas booster will not boost the water temperature. When the solar
heated water temperature is below 58°C, the gas burners ignite to provide immediate heating of the water to
its preset outlet temperature setting. The heat produced by the burner is transferred to the water through the
heat exchanger. The water is heated to a constant temperature by the automatic adjustment of the gas supply
to the burner to suit the water flow rate. The gas burners extinguish when the hot tap is closed.
If another type of in-series booster water heater is used and the solar heated water temperature is above its
thermostat setting, the water heater will not boost the water temperature. When the solar heated water
temperature is below the thermostat setting of the water heater, the booster will operate to heat the water.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the in-line gas booster has not operated for some time (which is most often first
thing in the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat
exchanger warms up. This is both an energy and water saving feature of this water heater. Once the heat
exchanger has warmed up the hot water flow will increase and remain at normal flow levels. This feature will
only occur at a cold start-up and not when the heat exchanger is already warm from a recent use of hot water.
HOW HOT SHOULD THE WATER BE?
The solar control unit will circulate the closed circuit fluid through the solar
collectors until a temperature of approximately 75°C is reached in the solar
storage tank. During periods of low solar energy gain, the continuous flow
in-series gas booster will boost the water temperature automatically to its
preset outlet temperature setting, or to the temperature setting of another
type of in-series booster water heater.
The factory preset outlet temperature setting of the in-series gas booster is:
874820, 874826 60°C
Note: The preset outlet booster temperature setting of the continuous flow
in-series gas booster cannot be adjusted by the householder. The setting
can only be adjusted by the installer, Rheem Service or their nearest
Accredited Service Agent.
Note: AS 3498 requires that a water heater provides the means to inhibit the
growth of Legionella bacteria in potable water. If this water heater is installed
with an continuous flow in-series gas booster, then this requirement of
AS 3498 can be satisfied provided the booster is energised, its preset outlet
temperature setting is 70°C or higher and a remote temperature controller
or an EZiSET kit is not used.
If this water heater is installed with an in-series storage booster, then this requirement of AS 3498 can be
satisfied provided the storage booster is energised and its thermostat setting is 60°C or higher.
Warning: Temperature controllers or an EZiSET kit must not be fitted to the in-series booster as part of a
solar water heater system because water at a temperature much higher than the controller or EZiSET setting
can be delivered.
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.
typical maximum
temperature from
solar gain
maximum
recommended supply
temperature to
bathrooms and
ensuites

ABOUT YOUR WATER HEATER
6
SAFETY
The solar storage tank is supplied with temperature sensors, a pressure relief valve and a combination
temperature pressure relief valve. The in-series gas booster is supplied with temperature sensors, a
FlameSafe™ protection system and a 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.
If the power supply cord or plug to the solar storage tank or in-series gas booster 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 Rheem. Phone Rheem Service or their nearest Accredited
Service Agent to arrange for an inspection.
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.
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.
This water heater uses 240 V AC electrical power for operation of the control systems and the electrically
operated components. The removal of the front covers will expose 240 V wiring. They must only be
removed by a qualified person.
The power leads from the solar storage tank and in-series gas booster must be plugged into weatherproof
electrical outlets. Take care not to touch the power plug with wet hands.
Do not touch any exposed pipe work or fittings connecting the solar storage tank and the solar collectors,
as this may result in a burn injury. Very high temperature closed circuit fluid can be generated by the solar
collectors under certain conditions and this flows through the pipe work from the solar collectors to the
solar storage tank.
Note: Any exposed pipe work or fittings in the collector circuit should be attended to and covered with
insulation. Phone Rheem Service or their nearest Accredited Service Agent to arrange for an inspection.
Should the water from the water heater appear blue or if blue closed circuit fluid is noticed around the
base of the water heater, this indicates a leak of the closed circuit fluid from the heat exchanger. The
closed circuit fluid is non-toxic and not hazardous to health. Phone Rheem Service or their nearest
Accredited Service Agent to arrange for an inspection.
For continued safety of this water heater it must be installed, operated and maintained in accordance with
the Owner’s Guide and Installation Instructions.
Do not modify this water heater.
Do not use or store flammable materials in or near the gas
booster. Flammable liquids (such as petrol), combustible
materials (such as newspapers) and similar articles must be kept
well away from the gas booster and the flue terminal.
Do not spray aerosols in the vicinity of the gas booster while it
is in operation. Gases from many aerosol sprays are flammable,
or may become corrosive when drawn into a flame.
Do not store swimming pool chemicals, household cleaners,
etc., near the gas booster.
Do not place articles on or against the gas booster, or in contact with the flue terminal. Ensure the flue
terminal is not obstructed in any way at any time.
Do not use Propane / Butane gas mixtures in a Propane model. A Propane model is designed to operate
on Propane only. The use of Propane / Butane mixture, such as automotive LP gas fuel, in a Propane
model is unsafe and can cause damage to the gas booster.

ABOUT YOUR WATER HEATER
7
SOLAR MONITOR
The solar storage tank incorporates a solar monitor. The solar monitor is located above the lower front cover
and houses both a green and a red LED.
The green LED, marked “Solar”, indicates the current operational mode of the solar 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 two (2) second interval between
each series.
The red LED will emit a series of flashes, with a two (2) second interval between each series, only if there is a
particular fault condition with the system.
The operational modes are:
Flashes
Operational Modes
solid green
(remains on)
Standby mode
2 x green
Flooding solar circuit
3 x green
Pump flow control
4 x green
Pump flow established
5 x green
Tank at maximum temperature
no green
(remains off)
Call for service
If the power supply to the water heater is on and the green LED is off or the red LED is flashing, this indicates
there is a fault with the water heater. The red LED may emit up to six (6) flashes in each series of flashes.
Count the number of flashes and phone Rheem Service or their nearest Accredited Service Agent to arrange
for an inspection.
RAINWATER COLLECTION SYSTEM
If the solar collectors and solar pipe work are installed on a section of roof which is part of a rainwater runoff
collection system, then it is recommended this section of roof and its gutter be isolated from the rainwater
collection system.
The closed circuit fluid acts as an anti-freeze agent and rust inhibitor, is non-toxic to humans and is harmless
to the environment. However it does have an adverse effect on water stored in rainwater tanks. It will kill
microscopic algae typically present in rainwater tanks and cause an unpleasant odour to develop. This will
result in the rainwater tank having to be drained and cleaned.
If a rainwater tank does become contaminated with closed circuit fluid, then the following actions should be
undertaken by a qualified person. Additional actions may be necessary to return the water supply to a
consumable state.
Correct the leak or spillage.
Wash down the roof area where the spill or leak has occurred.
Flush out the gutters and down pipes.
Determine how the closed circuit fluid made its way into the rainwater tank. If the section of roof supporting
the solar water heater is not isolated from the rainwater collection system, then this should be remedied.
Empty the rainwater tank, and clean out all algae from the inside of the tank.
Refill the rainwater tank with fresh water.
Refer to “Rainwater Collection System” on page 25 for additional information.

ABOUT YOUR WATER HEATER
8
FREEZE PROTECTION
The water heater has a freeze protection system. The water heater, including the in-series gas booster, is not
suitable for installation in areas where the ambient temperature falls below -20°C (including wind chill factor).
Refer to “Freeze Protection” on page 28 for further information.
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 11 and to “Anode Inspection and Replacement” on page 15.
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 a 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 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 to the solar storage tank and to the in-series gas booster at the power
outlets if there is no risk of freezing conditions occurring (refer to the notes below).
Close the gas isolation valve at the inlet to the water heater.
Close the cold water isolation valve at the inlet to the water heater.
Notes:
The in-series gas booster frost protection system will be rendered inoperable if electrical power is not
available at the gas booster. Damage caused by freezing due to the unavailability of power at the in-series
gas booster is not covered by the Rheem warranty (refer to “Terms of the Rheem Warranty” on page 62).
If it is necessary to switch the power off to the in-series gas booster and there is a risk of freezing, then it
is necessary to drain the gas booster (refer to “Draining the Gas Booster Water Heater” on page 9).
TO TURN ON THE WATER HEATER
Screw in the drain plugs at the cold water inlet and hot water outlet of the in-series gas booster if the gas
booster has been drained.
Open the cold water isolation valve fully at the inlet to the water heater.
Open all of the hot water taps in the house (don’t forget the shower).
Air will be forced out of the taps.
Close each tap as water flows freely from it.
Open the gas isolation valve fully at the inlet to the water heater.
Plug in the solar storage tank and gas booster at the power outlets and switch on the electrical supplies.
The power outlets must be switched on for the solar controls to operate and solar gain to be achieved and
for the in-series gas booster to operate.
The in-series gas booster will operate automatically when you open a hot tap, if boosting is required.

ABOUT YOUR WATER HEATER
9
DRAINING THE GAS BOOSTER WATER HEATER
Turn off the water heater (refer to “Turn Off The Water Heater” on page 8).
Open a hot tap (preferably the shower outlet).
Unscrew the two drain plugs, one each at the cold water inlet and hot water outlet, on the underside of
the in-series gas booster.
Water will drain from the in-series gas booster.
When water stops flowing from the in-series gas booster, close the hot tap.
Note: It is recommended not to screw the drain plugs back in, until the water heater is to be turned on again.
GOING ON HOLIDAYS
It is not necessary to switch off the electrical supply at the power outlets to the solar storage tank and in-series
gas booster if you are going away. However, if it is necessary to switch off the power to the water heater, refer
to “To Turn Off The Water Heater” on page 8.
If the power to the water heater is switched off and there is a risk of freezing, then it is necessary to drain the
in-series gas booster (refer to “Draining the Gas Booster Water Heater” on page 9).
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 21 to 32. 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 or AS/NZS 3500.5:2012 Section 3 (for a Class 1a or
Class 10 building) as applicable under the Plumbing Code of Australia, AS/NZS 3000, and either AS 5601
or AS/NZS 5601.1 as applicable under local regulations, and all local codes and regulatory authority
requirements.
Warning: Temperature controllers or an EZiSET kit must not be fitted to the in-series booster as part of a
solar water heater system because water at a temperature much higher than the controller or EZiSET setting
can be delivered.
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.

ABOUT YOUR WATER HEATER
10
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, components and fittings. Refer to “Water Supplies” on page 14.
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 14 to 16.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer’s warranty (refer to page 62). 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.

11
MAINTENANCE REQUIREMENTS
GENERAL MAINTENANCE
The jacket of the water heater can be cleaned with a soft cloth and warm mild soapy water. Under no
circumstances should abrasive materials or powders be used.
The area around the water heater can be sprayed with insecticide to rid the area of insects. Insects encroaching
into or nesting in the water heater can interfere with the operation of the water heater and also damage
components.
Switch off the electrical supply at the power outlet to the water heater and only spray the insecticide when
the water heater is not operating.
Gases from many aerosol sprays are flammable, or may become corrosive when drawn into a flame.
Wait a few minutes to allow any aerosol gases to dissipate before switching on the electrical supply at the
power outlet to the water heater.
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 13.
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 13.
Check the drain line from the safe tray (if one is installed) is not blocked.
Inspect around the air inlet, flue terminal and the gas booster in general for plant growth.
Trim back any shrubs, bushes or other plants which have encroached around the gas booster.
Plant growth across the air inlet and flue terminal can interfere with the performance of the gas
booster.
Inspect around the gas booster for insect infestations, such as ants. The area around the water heater
can be sprayed with insecticide to rid the area of insects. Insects encroaching into or nesting in the water
heater can interfere with the operation of the water heater and also damage components.
Switch off the electrical supply at the power outlet to the water heater and only spray the insecticide
when the water heater is not operating.
Gases from many aerosol sprays are flammable, or may become corrosive when drawn into a flame.
Wait a few minutes to allow any aerosol gases to dissipate before switching on the electrical supply
at the power outlet to the water heater.

MAINTENANCE REQUIREMENTS
12
MAJOR SERVICE EVERY FIVE YEARS
It is recommended a major service be conducted on the water heater every five (5) years. If an anode
replacement is conducted sooner than a major service, then the major service should coincide with the
replacement.
Warning: Servicing of a water heater must only be carried out by qualified personnel. Phone Rheem
Service or their nearest Accredited Service Agent.
Note: The major 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. 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 anodes.
If an anode is not replaced, it should be replaced within three years of this service (refer to “Anode
Inspection and Replacement” on page 15).
Check the system for correct operation.
Check the closed circuit fluid level.
Clean the collector glass.
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 solar storage tank may need to be drained during this service. After the completion of the service,
the solar storage tank will take some time to reheat the water by solar gain.
If this solar storage tank is installed with an integrated or remotely installed Rheem in-series continuous flow
gas booster, then for the booster’s safe and efficient operation, it is recommended a major service be
conducted on the gas booster every five (5) years. Another type of in-series booster may have its own
recommended service schedule. Refer to the Owner’s Guide and Installation Instructions supplied with the
booster water heater.
COLLECTOR GLASS
Ensure the glass on your solar collectors is free of dust, salt spray or any other matter which may reduce the
effectiveness of the solar collectors. Rainfall should keep the collector adequately clean. It is recommended
the collector glass be washed clean at least every three months should adequate rain not have fallen in this
period.
Collector glass can be hosed down or if the solar collectors is accessible such as on a trafficable roof, wash
the collector glass with water and a soft brush when the solar collectors is cool, such as early in the morning.
In extremely dusty areas extra attention may need to be given to keeping the collector glass clean.
Have any trees trimmed which may shade the solar collectors.
Rheem solar collectors have passed the AS/NZS 2712 requirements for resistance to hailstone damage, so it
is not normally necessary to fit a guard to a collector. Stone Guards are available for the NPT200 and LCS
solar collectors to provide a level of protection to the collectors against vandalism or accidental damage.
Contact Rheem or your local Rheem Solar Water Heater Distributor for details.

MAINTENANCE REQUIREMENTS
13
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 19).
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 (6) months. Refer to “Minor
Maintenance Every Six Months” on page 11. It is very
important the lever is raised and lowered gently.
Warning: Failure to do this may result in the water
heater cylinder failing.
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 five (5) years, or more
frequently in areas where there is a high incidence of water deposits (refer to “Water Supplies” on page 14).
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 (6) 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 Rheem Service or their nearest Accredited Service Agent. 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.
HOUSEHOLD MAINTENANCE AROUND THE SOLAR STORAGE TANK
Care should be taken when conducting general household maintenance, such as lawn mowing and grass
cutting, around the solar storage tank. Careless use of devices such as a whipper snipper could damage or
cut a sensor lead or electrical cable.
If a sensor lead or electrical cable is damaged or cut, solar contribution may not be achieved. In addition, if the
electrical cable has been damaged or cut, wiring may be exposed leading to a dangerous situation.
On a regular basis, inspect around the water heater for insect infestations, such as ants. Insects may look for
a warm place to nest, particularly in wet weather. Insects encroaching into or nesting in the water heater and
the solar control unit can interfere with the operation of the water heater and also damage components. Spray
insecticide around the base of the water heater if necessary to rid the area of insects.
water
heater
drain
line
lift until water
flows from the
drain line –
lower gently

14
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 water heater cylinder, a temperature pressure relief valve and a continuous flow
water heater heat exchanger.
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
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 Rheem warranty to apply to the water heater cylinder.
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 an anode 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.
(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 (3570 μS/cm),
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 / conductivity level of the water

WATER SUPPLIES
15
ANODE INSPECTION AND REPLACEMENT
The anode installed in this 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 five (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 12) then the maximum time after installation when the anode should be replaced for this water
heater is eight (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.
SATURATION INDEX
The saturation index 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.
Where the saturation index is less than –1.0, the water is very corrosive and the Rheem warranty does not
apply to a continuous flow water heater heat exchanger.
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. An expansion control valve must be fitted
on the cold water line after the non-return valve to protect and for the Rheem warranty to apply to the
temperature pressure relief valve and water heater cylinder.
Where the saturation index exceeds +0.80, the Rheem warranty does not apply to a continuous flow water
heater heat exchanger.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the water.
Refer to the Saturation Index chart on page 16.
Refer to the cold water connection detail on page 39 for the position of the expansion control valve.

WATER SUPPLIES
16
SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING WARRANTY
The water heater, solar collectors and their 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
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
gas booster copper heat exchanger
Saturation Index (SI) > +0.4
(if an expansion control valve is not fitted)
temperature pressure relief valve,
water heater cylinder
Saturation Index (SI) > +0.8
gas booster copper heat exchanger
+0.4 +0.80
very corrosive very scaling
scaling
corrosive
-1.0
no warranty applies to a:
temperature pressure relief valve
or a water heater cylinder unless
an expansion control valve is fitted.
no warranty applies to a:
-direct (open circuit) solar collector -continuous flow copper heat
exchanger
SATURATION INDEX (SI)
SOLAR WATER HEATERS - INTEGRATED GAS BOOST (CONTINUOUS FLOW)
WITHIN WARRANTY
SPECIFICATION
SATURATION INDEX
(calculated @ 80°C water temperature)
no warranty applies to a:
-direct (open circuit) solar collector -continuous flow copper heat
exchanger

17
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.
COLD WATER FROM THE HOT TAP
Close the hot tap, wait 10 seconds and open the hot tap again.
Is the hot tap open enough?
The in-series gas booster burners will not light if the flow rate is less than 2.0 L / min (874820 or
874826 models).
Solar control unit and in-series gas booster not operating
Check the power supply cords are plugged in and the power outlets switched on.
Is power available in the house?
Try using another electrical appliance.
Gas supply
Is the isolation valve in the gas line open?
Is there a gas supply to the rest of the house?
Try lighting another gas appliance.
Has the gas line been purged of air after installation?
Refer to a plumber.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the in-line gas booster has not operated for some time (which is most often first
thing in the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat
exchanger warms up. This is both an energy and water saving feature of this water heater. Once the heat
exchanger has warmed up the hot water flow will increase and remain at normal flow levels. This feature will
only occur at a cold start-up and not when the heat exchanger is already warm from a recent use of hot water.
NO WATER FROM THE HOT TAP
No flow of water from the hot tap may indicate a restriction in or failure of the cold water supply to the water
heater. Check for water flow at other taps and that the cold water isolation valve (refer to page 39) is fully open.
WATER FLOW FLUCTUATES
Too many taps in use at the same time may cause a decrease in the hot water flow from the taps. This can be
evident if the solar heated water is at a low temperature and an in-series continuous flow gas booster is
operating.
Are there several hot taps open, or are appliances such as a dishwasher or washing machine, in use at
the same time?
Ensure only one or two hot taps (874820 models) or no more than two or three hot taps (874826 models)
or appliances are on at the one time.
Check the flow of hot water from each tap to see if one or more outlets are using more water than you
think.
Have your plumber install a flow control valve to each shower outlet, basin and sink to reduce water usage.

SAVE A SERVICE CALL
18
IN-SERIES BOOSTER OPERATING TOO FREQUENTLY
You may find that the in-series booster operates more frequently than expected. This will occur when the solar
heated water temperature is lower than 58°C for a 874820 or 874826 in-series gas booster or lower than the
temperature setting of another type of in-series booster, which may be experienced during periods of low solar
energy gain or if there has been heavy hot water usage. Factors to consider are:
Hot tap not used recently
If a hot tap has not been used for a while, the water in the pipe work between the solar storage tank and
the in-series gas booster may have cooled down. The in-series gas booster will sense the cooler water
and this will cause the burners on the water heater to ignite and boost the water temperature when a hot
tap is first turned on. The burners will extinguish when solar heated water of 58°C or higher from the solar
storage tank reaches the in-series gas booster (refer also to “Fan Continues to Run after Water Heater
Operation Stops” on page 18).
Insufficient sunlight
Insufficient sunlight due to cloudy weather during hotter months or low solar energy contribution in colder
months may mean the in-series gas booster operates more often.
Collector shaded
If trees or other objects shade the solar collectors or if the glass is dirty, the effectiveness of the solar
collectors will be greatly reduced. Have the trees trimmed or the solar collectors relocated if the obstruction
is permanent or clean the collector glass (refer to “Collector Glass” on page 12).
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 solar gains.
Have a plumber install a flow control valve to each shower outlet, basin and sink 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 19.
Water heater size
Do you have the correct size water heater for your requirements?
The sizing guide in the sales literature suggests average sizes that may be needed.
Green LED is off or red LED is flashing on Solar Monitor
If the green LED is off or the red LED is flashing on the Solar Monitor label, there may be a problem with
the solar water heater operation and solar gain is not being achieved. This will result in the in-series gas
booster operating to provide all of the hot water required.
Switch off the electrical supply at the power outlet to the solar storage tank for a few seconds, then switch
on again.
If the green LED remains off or the red LED recommences to flash, then count the number of flashes and
phone Rheem Service or their nearest Accredited Service Agent to arrange for an inspection.
FAN CONTINUES TO RUN AFTER WATER HEATER OPERATION STOPS
It is the normal operation of the 874820 or 874826 in-series gas booster for the fan to continue running after
heating of the water is finished. The fan may run for up to two minutes after the burners extinguish, to prepare
for the next ignition.

SAVE A SERVICE CALL
19
COLLECTOR GLASS
The Rheem warranty DOES NOT cover breakage of solar collector glass. Check your household insurance
policy covers collector glass breakage.
Warning: No attempt should be made to remove or replace broken collector glass.
The collector glass is not offered as a replacement part. Should a solar collector require replacement, contact
Rheem Service or their nearest Accredited Service Agent.
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 13).
This may dislodge a small particle of foreign matter and clear the
fault. Release the lever gently.
Steady flows for long period (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 the cold water connection diagram on 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.
PRESSURE RELIEF VALVE DISCHARGING
A pressure relief valve is incorporated into the in-series gas booster
controls. This valve protects the in-series gas booster, by allowing water
to escape, in the event of excessive pressure build up in the waterways.
Normal operation
A small volume of water may discharge from the bottom of the in-
series gas booster when a hot tap is suddenly closed.
Continuous dribble
A continuous dribble may indicate the water supply pressure is
above the design pressure for the in-series gas booster. If so, a
pressure limiting valve must be installed on the cold water supply
pipe to the water heater (refer to “Mains Water Supply” on page 24).
CLOUDS OF WHITE ‘VAPOUR’ FROM THE FLUE TERMINAL
During the heating cycle, it is not unusual to see water vapour clouds
steaming from the flue terminal, particularly on cold days. This is normal
operation of the in-series gas booster.

SAVE A SERVICE CALL
20
ERROR CODE
The in-series gas booster provides a diagnostic error code in the event of an interruption to its operation. The
error code is displayed on the LED display on the front of the in-series gas booster as a numerical value. If an
error code appears:
Close the hot tap and switch off the electrical supply to the in-series
gas booster.
Check the gas isolation valve at the gas inlet to the water heater is
fully open.
Wait 5 minutes, then switch on the electrical supply to the in-series
gas booster and open a hot tap.
If the error code persists, take note of the numerical code and turn off
the hot tap. Phone Rheem Service or their nearest Accredited Service
Agent to arrange for inspection.
HIGHER THAN EXPECTED ENERGY BILLS
With the installation of your new solar hot water system, maximum energy savings can be achieved with careful
planning of hot water usage. Should you at any time feel your energy bill is higher than expected, we suggest
you check the following points:
Is the relief valve running excessively?
Refer to “Temperature Pressure Relief Valve Running” on page 19.
Is one outlet (especially the shower) using more hot water than you
think?
Refer to “In-Series Booster Operating Too Frequently”on page 18.
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 a plumber rectify any
leaking pipe work.
Is the in-series gas booster operating too frequently?
Refer to “In-Series Booster Operating Too Frequently” on page 18.
Has there been an increase in hot water usage?
An increase in hot water usage may result in an increase in booster operation.
Has your water heating tariff rate been increased by your energy retailer since your previous bill?
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE, PHONE
RHEEM SERVICE OR THEIR NEAREST ACCREDITED SERVICE AGENT.