Rheem 340SS Owner's Manual And Installation Instructions

Owner’s Guide

and

Installation Instructions

Gas Domestic Outdoor Water Heater

340SS stainless steel model

This water heater must be installed and serviced by a qualified person.

Please leave this guide with the householder.

Upon completion of the installation and commissioning

of the water heater, leave this guide with the householder or

heater or ignite when the water heater is turned on.

RHEEM AUSTRALIA PTY LTD, A.B.N. 21 098 823 511

For Service Telephone 131031 AUSTRALIA

Warning:

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

www.rheem.com.au

An electronic copy of these Owner’s Guide and Installation Instructions

This water heater may be protected by one or more patents or registered designs

in the name of Rheem Australia Pty Ltd or Aquamax Australia Pty Limited.

Note: Every care has been taken to ensure the accuracy in preparation of this

publication. No liability can be accepted for any consequences,

can be downloaded from rheem.com.au.

PATENTS

®

Registered trademark of Rheem Australia Pty Ltd.

TM

Trademark of Rheem Australia Pty Ltd.

which may arise as a result of its application.

TRADEMARKS

CONTENTS

HOUSEHOLDER

This booklet contains important information about your

new water heater, including terms of the Rheem warranty.

We recommend you read pages 8 to 25,

and the terms of the Rheem warranty on pages 4 to 7.

The other pages are intended for the installer but may be of interest.

Warranty ...................................................................................... 4

Safety, Warnings, Installation Notes ......................................... 8

About Your Water Heater .......................................................... 12

Maintenance Requirements ...................................................... 16

Water Supplies ........................................................................... 18

Save A Service Call ................................................................... 22

Installation .................................................................................. 26

Connections – Plumbing .......................................................... 35

Commissioning .......................................................................... 39

Lighting The Water Heater ........................................................ 43

Draining The Water Heater ....................................................... 48

3

RHEEM GAS DOMESTIC MAINS PRESSURE

WATER HEATER WARRANTY - AUSTRALIA ONLY

RHEEM STAINLESS STEEL 8A0340 GAS MODEL

1. THE RHEEM WARRANTY – GENERAL

1.1 This warranty is given by Rheem Australia Pty Limited ABN 21 098 823 511 of
1 Alan Street, Rydalmere New South Wales.

1.2 Rheem offer a trained and qualified national service network who will repair or
replace components at the address of the water heater subject to the terms of
the Rheem warranty. Rheem Service, in addition can provide preventative
maintenance and advice on the operation of your water heater. The Rheem
Service contact number is 131031, with Contact Centre personnel available
24 hours, 7 days a week to take your call and if necessary to arrange a service
call for during normal working hours Monday to Friday (hours subject to
change).

1.3 For details about this warranty, you can contact us on 131031 or by email at
[e-mail] (not for service bookings).

1.4 The terms of this warranty and what is covered by it are set out in sections 2
and 3 and apply to water heaters manufactured from 1st December 2019.

1.5 If a subsequent version of this warranty is published, the terms of that warranty
and what is covered by it will apply to water heaters manufactured after the
date specified in the subsequent version.

2. TERMS OF THE RHEEM WARRANTY AND EXCLUSIONS TO IT

2.1 Rheem may reject a claim under this warranty in its sole discretion if:

a) You do not arrange for a major service to be conducted on your water

heater in the sixth year after installation, in accordance with Rheem’s
recommendation in the Owner’s Guide and Installation Instructions; and

b) The fault giving rise to the warranty claim would have been detected and

rectified during that major service.

2.2 The decision of whether to repair or replace a faulty component is at Rheem’s
sole discretion.

2.3 If you require a call out and we find that the fault is not covered by the Rheem
warranty, you are responsible for our standard call out charge. If you wish to
have the relevant component repaired or replaced by Rheem, that service will
be at your cost.

2.4 Where a failed component or cylinder is replaced under this warranty, the
balance of the original warranty period will remain effective. The replacement
does not carry a new Rheem warranty.

4

RHEEM GAS DOMESTIC MAINS PRESSURE

WATER HEATER WARRANTY - AUSTRALIA ONLY

RHEEM STAINLESS STEEL 8A0340 GAS MODEL

2.5 Where the water heater is installed outside the boundaries of a metropolitan
area as defined by Rheem or further than 25 km from either a regional Rheem
branch office or an Accredited Rheem Service Agent's office, the cost of
transport, insurance and travelling between the nearest branch office or
Rheem Accredited Service Agent’s office and the installed site shall be the
owner’s responsibility.

2.6 Where the water heater is installed in a position that does not allow safe or
ready access, the cost of that access, including the cost of additional materials
handling and/or safety equipment, shall be the owner’s responsibility. In other
words, the cost of dismantling or removing cupboards, doors or walls and the
cost of any special equipment to bring the water heater to floor or ground level
or to a serviceable position is not covered by this warranty.

2.7 This warranty only applies to the original and genuine Rheem water heater in
its original installed location and any genuine Rheem replacement parts.

2.8 The Rheem warranty does not cover faults that are a result of:

a) Accidental damage to the water heater or any component (for example: (i)

Acts of God such as floods, storms, fires, lightning strikes and the like; and
(ii) third party acts or omissions).

b) Misuse or abnormal use of the water heater.

c) Installation not in accordance with the Owner’s Guide and Installation

Instructions or with relevant statutory and local requirements in the State
or Territory in which the water heater is installed.

d) Connection at any time to a water supply that does not comply with the

water supply guidelines as outlined in the Owner’s Guide and Installation
Instructions.

e) Repairs, attempts to repair or modifications to the water heater by a person

other than Rheem Service or a Rheem Accredited Service Agent.

f) Faulty plumbing or faulty gas supply.

g) Failure to maintain the water heater in accordance with the Owner's Guide

and Installation Instructions.

h) Transport damage.

i) Fair wear and tear from adverse conditions (for example, corrosion).

j) Cosmetic defects.

5

RHEEM GAS DOMESTIC MAINS PRESSURE

The period from the

order to be covered

Rheem Stainless Steel 8A0340 gas model

Repair and/or replacement of
the faulty component, free of
charge, including labour.

Repair and/or replacement of

, free of charge,

including labour.

Replacement cylinder free of

repair
labour costs are the
responsibility of the owner.

WATER HEATER WARRANTY - AUSTRALIA ONLY

RHEEM STAINLESS STEEL 8A0340 GAS MODEL

2.9 Subject to any statutory provisions to the contrary, this warranty excludes any
and all claims for damage to furniture, carpet, walls, foundations or any other
consequential loss either directly or indirectly due to leakage from the water
heater, or due to leakage from fittings and/or pipe work of metal, plastic or other
materials caused by water temperature, workmanship or other modes of
failure.

2.10 If the water heater is not sized to supply the hot water demand in accordance
with the guidelines in the Rheem water heater literature, any resultant fault will
not be covered by the Rheem warranty.

3. WHAT IS COVERED BY THE RHEEM WARRANTY

FOR THE WATER HEATERS DETAILED IN THIS DOCUMENT

3.1 Rheem will repair or replace a faulty component of your water heater if it fails
to operate in accordance with its specifications as follows:

What components

are covered

All components

(all installations)

The cylinder

(if the water heater is

installed in a single-family

domestic dwelling)

date of installation

in which the fault

must appear in

Year 1

Years 2 & 3

Years 4 to 12

6

What coverage

you receive

the cylinder

charge. Installation and

RHEEM GAS DOMESTIC MAINS PRESSURE

WATER HEATER WARRANTY - AUSTRALIA ONLY

RHEEM STAINLESS STEEL 8A0340 GAS MODEL

4. ENTITLEMENT TO MAKE A CLAIM UNDER THIS WARRANTY

4.1 To be entitled to make a claim under this warranty you need to:

a) Be the owner of the water heater or have consent of the owner to act on

their behalf

b) Contact Rheem Service without undue delay after detection of the defect

and, in any event, within the applicable warranty period.

4.2 You are not entitled to make a claim under this warranty if your water heater:

a) Does not have its original serial numbers or rating labels.

b) Is not installed in Australia.

5. HOW TO MAKE A CLAIM UNDER THIS WARRANTY

5.1 If you wish to make a claim under this warranty, you need to:

a) Contact Rheem on 131031 and provide owner’s details, address of the

water heater, a contact number and date of installation of the water heater
or if that’s unavailable, the date of manufacture and serial number (from
the rating label on the water heater).

b) Rheem will arrange for the water heater to be tested and assessed on-

site.

c) If Rheem determines that you have a valid warranty claim, Rheem will

repair or replace the water heater in accordance with this warranty.

5.2 Any expenses incurred in the making of a claim under this warranty will be
borne by you.

6. THE AUSTRALIAN CONSUMER LAW

6.1 Our goods come with guarantees that cannot be excluded under the Australian
Consumer Law. You are entitled to a replacement or refund for a major failure
and for compensation for any other reasonably foreseeable loss or damage.
You are also entitled to have the goods repaired or replaced if the goods fail to
be of acceptable quality and the failure does not amount to a major failure.

6.2 The Rheem warranty (set out above) is in addition to any rights and remedies
that you may have under the Australian Consumer Law.

7

SAFETY, WARNINGS, INSTALLATION NOTES

It is important you read the following safety and warnings information.

SAFETY AND WARNINGS

•

This water heater is only intended to be operated by persons who have the
experience or the knowledge and the capabilities to do so.

• This water heater is not intended to be operated by persons with reduced

physical, sensory or mental capabilities i.e. the infirm, or by children. Children
should be supervised to ensure they do not interfere with the water heater.

• This water heater is supplied with a thermostat, an over-temperature cut-out,

a thermocouple 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 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.

• Do not modify this water heater.

• Do not spray aerosols in the vicinity of

this water heater while it is in operation.
Propellants and gases in many aerosol
sprays contain hydrocarbons which are
flammable. Gases from aerosol sprays
may also become corrosive when drawn
into a flame.

• Do not use or store flammable

materials in or near this water heater.

Flammable liquids (such as petrol),
combustible materials (such as
newspapers) and similar articles must be
kept well away from the water heater and
the flue terminal.

• Do not store swimming pool chemicals, household cleaners, etc., near the

water heater.

• Do not place articles on or against this water heater, or in contact with the

flue terminal. Ensure the flue terminal is not obstructed in any way at any
time.

8

SAFETY, WARNINGS, INSTALLATION NOTES

• The water heater will operate until a water temperature of up to 75°C is

reached, depending upon the thermostat setting.

Refer to “How Hot Should The Water Be?” on page 12 and “Temperature
Adjustment” on page 13.

• The lever on the temperature pressure relief valve and expansion control

valve (if fitted) requires to be operated every six (6) months to clear any
deposits and to ensure the valve and its drain line are not blocked.

Refer to “Relief Valves” on page 9 and “Minor Maintenance Every Six Months”
on page 16.

• For continued safety of this water heater it must be installed, operated and

maintained in accordance with the Owner’s Guide and Installation
Instructions.

• Servicing of a water heater must only be carried out by qualified personnel.

Phone Rheem Service or their nearest Accredited Service Agent.

• Only a person qualified to install or service a water heater can drain the water

heater, if this is required.

RELIEF VALVES

Temperature Pressure Relief Valve

This water heater incorporates a temperature
pressure relief valve located near the top of the
water heater. This valve is essential for the
water heater’s safe operation.

It is possible for the valve to discharge a
quantity of water through the drain line during
each heating period. This quantity should be
equal to approximately 1/50 of the hot water
used, as water expands by this volume when
heated.

Expansion Control Valve

In many areas, including South Australia and
scaling water areas, it is mandatory an
expansion control valve is fitted to the cold
water line to the water heater.

The expansion control valve will discharge the quantity of water from its drain
line during the heating period instead of the temperature pressure relief valve as
it has a lower pressure rating.

9

SAFETY, WARNINGS, INSTALLATION NOTES

lift until water

drain

Valve Operation

Continuous leakage of water from either valve and its drain line may indicate a
problem with the water heater. Refer to “Temperature Pressure Relief Valve or
Expansion Control Valve Running” on page 24.

Warning: Never block the outlet of either valve or their drain lines for any
reason. A relief valve drain must be left open to atmosphere, and be installed in
a continuously downward direction.

In locations where water pipes are prone to freezing, the relief valve drain line
must be insulated and not exceed 300 mm in length before discharging into a
tundish through an air gap.

Operate the easing lever on the temperature
pressure relief valve and expansion control
valve once every six (6) months to clear any
deposits and ensure the valve and its drain line
are not blocked. It is very important the lever
is raised and lowered gently. Refer to “Minor
Maintenance Every Six Months” on page 16.

Warning: Water discharged from the
temperature pressure relief valve drain line will
be hot. Exercise care to avoid any splashing of
water by standing clear of the drain line’s point
of discharge when operating either valve’s

flows from the

drain line –

lower gently

line

easing lever.

Warning: Failure to operate the easing lever on the relief valve once every
six (6) months may result in the water heater cylinder failing.

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 six (6) years and the expansion control valve should be checked for
performance or replaced at intervals not exceeding six (6) years. The checking
of the valves performance or replacement should occur more frequently in areas
where there is a high incidence of water deposits. Refer to “Water Supplies” on
page 18.

10

SAFETY, WARNINGS, INSTALLATION NOTES

INSTALLATION NOTES

This water heater must be installed:

• by a qualified person,

• in accordance with the installation instructions,

• in compliance with the Plumbing Standard AS/NZS 3500.4,

 This water heater is suitable for outdoor installation only.

 This water heater is intended to be permanently connected to the water

mains and not connected by a hose-set. A braided flexible hose or semi­flexible connector may be used for connection to the water heater, where
permitted by AS/NZS 3500.4.

• in compliance with the Gas Installations Standard AS/NZS 5601.1, and

• in compliance with all local codes and regulatory authority requirements.

Installation and commissioning requirements and details for the installing
plumber are contained on pages 26 to 47.

Mains pressure water supply

The water heater is designed to operate at mains pressure by connecting directly
to the mains water supply.

The water heater is supplied with a temperature pressure relief valve with a
pressure rating of 1400 kPa. If an expansion control valve has been installed on
the cold water line to the water heater, this should have a pressure rating of
1200 kPa.

The maximum mains water supply pressure for the water heater is 1120 kPa if
an expansion control valve is not installed, or 960 kPa if an expansion control
valve is installed. If the mains supply pressure in your area exceeds these values,
a pressure limiting valve must be installed.

The supply pressure should be greater than 350 kPa for true mains pressure
operation to be achieved.

Securing of the water heater

It is recommended the top of the water heater be secured to the wall or screen
with the wall brackets provided using fasteners suitable for the wall or screen
type and application. Refer to “Wall Bracket” on page 30 for additional
information.

11

maximum thermostat

setting

maximum

ensuites

minimum

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

The Rheem® water heater model you have
chosen is suitable for outdoor installation only. It
is a five star high efficiency, quick recovery
Rheem 8A0340 model stainless steel water
heater.

Water is stored in a stainless steel cylinder and
heated by a gas burner located under the
cylinder. The heat produced by the burner is
transferred to the water through the base, top
and side walls of the storage cylinder with flue
baffle rings capturing heat to improve efficiency.
The gas supply to the burner is controlled by the
thermostat so the water is heated to a constant
temperature.

Automatic safety controls are fitted to the water heater to provide safe and
efficient operation.

HOW HOT SHOULD THE WATER BE?

The water heater features a user adjustable
thermostat, which allows you to personally
choose the most suitable temperature for your
hot water needs. Refer to “Temperature
Adjustment” on page 13.

To meet the requirements of the National
Plumbing Standard the temperature of the
stored water must not be below 60°C.

Note: AS 3498 requires that a water heater
provides the means to inhibit the growth of
Legionella bacteria in potable water. This water
heater can satisfy this AS 3498 requirement
provided it is operating and the thermostat
setting is 60°C or higher, including when it is
used as an in-series booster water heater for a
solar water heater.

ABOUT YOUR WATER HEATER

recommended

stored water
temperature

recommended

supply temperature

to bathrooms and

12

HOTTER WATER INCREASES THE RISK OF SCALD INJURY

temperature dial position indicator

This water heater can deliver water at temperatures which can cause scalding.
Check the water temperature before use, such as when entering a shower or
filling a bath or basin, to ensure it is suitable for the application and will not cause
scald injury.

We recommend and it may also be required by regulations that an approved
temperature limiting device be fitted into the hot water pipe work to the bathroom
and ensuite when this water heater is installed. This will keep the water
temperature below 50°C at the bathroom and ensuite. The risk of scald injury will
be reduced and still allow hotter water to the kitchen and laundry.

TEMPERATURE ADJUSTMENT

Gas Control Temperature Dial

This water heater features a user adjustable thermostat (gas control) which
controls the stored water temperature. This is located behind the front access
cover on the lower front of the water heater. The temperature dial on the gas
control is used to control the water temperature inside of the storage cylinder.

The thermostat automatically controls the gas supply to the burner so a constant
water temperature is maintained within the storage cylinder. The thermostat is
fully automatic and the burner only operates when the water in the storage
cylinder requires heating. There is no need to switch the water heater off when it
is not in use, except perhaps when you are going away for an extended period.

The thermostat is adjustable up to
approximately 75°C. The temperature dial is
marked with numerals and each number
represents a temperature difference of
approximately 10°C. When aligned with the
temperature dial position indicator on the gas
control body, a setting of mid way between ‘3’
and ‘4’ will normally maintain the water
temperature at about 60°C.

To increase the water temperature to 75°C,
turn the temperature dial anticlockwise to a
setting of ‘5’. Refer to “Hotter Water Increases
the Risk of Scald Injury” on page 13.

ABOUT YOUR WATER HEATER

13

ABOUT YOUR WATER HEATER

PIEZO IGNITION

The “Piezo” push button igniter makes lighting
the pilot flame of your water heater very easy.
Simply follow the instructions on the label
attached to the back of the access cover. There
is no need for matches to light the water heater.

PILOT IGNITER

A permanent pilot flame burns to ignite the
main burner automatically. Heat from the pilot
is absorbed by the water.

PRECAUTIONS

The water heater must be maintained in accordance with the Owner’s Guide and
Installation Instructions. Refer to “Maintenance Requirements” on page 16.

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 it is necessary to turn off the water heater:

• Shut down the gas control (refer to “Close Down Procedure” on page 47).

• Close the gas isolation valve at the inlet to the gas control.

• 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 at the inlet to the water heater.

• Open the gas isolation valve fully at the inlet to the gas control.

• Light the water heater (refer to “Lighting the Water Heater” on page 43).

14

ABOUT YOUR WATER HEATER

GOING ON HOLIDAYS

If you plan to be away from home for one or two nights, we suggest you leave
the water heater turned on. However, if you plan to stay away more than a few
nights, the gas knob can be set to the red star “ ” (pilot) position (facing the
front) to conserve energy (refer to steps 1, 2 and 4 of “Close Down Procedure”
on page 47).

If it is necessary to turn off the water heater, refer to “To Turn Off The Water
Heater” on page 14.

Note: When turned back on from the red star “ ” (pilot) position or white dot “”
(off) position, the water heater may take up to an hour to reheat if the water has
lost temperature.

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 six (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 18.

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 18 to 21.

HOW LONG WILL THE WATER HEATER LAST?

The water heater is supported by a manufacturer’s warranty (refer to page 4).
There are a number of factors that will affect the length of service the water
heater will provide. These include but are not limited to the water chemistry, the
water pressure, the water temperature (inlet and outlet) and the water usage
pattern. Refer to “Precautions” on page 14.

15

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 the lever is raised and lowered gently. Refer to “Relief Valves”

on page 9.

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 the lever is raised and lowered gently. Refer to “Relief Valves”

on page 9.

SERVICE EVERY TWELVE MONTHS

For safe and efficient operation, it is recommended a service be conducted on
the water heater every twelve (12) months.

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 service and routine replacement of any components, if required, 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 annual service includes the following actions:

• Inspect and flush the temperature pressure relief valve.

• Inspect and flush the expansion control valve (if fitted).

• Check and if necessary adjust the inlet gas pressure.

• Check the condition and operation of the piezo igniter, gas control and

thermocouple.

• Check the operation of and clean the pilot light and main burner.

• Visually check the unit for any potential problems.

• Inspect plumbing and gas connections.

16

MAINTENANCE REQUIREMENTS

MAJOR SERVICE EVERY SIX YEARS

It is recommended a major service be conducted on the water heater every
six (6) years.

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 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.

• Check and if necessary adjust the inlet gas pressure.

• Check the condition and operation of the piezo igniter, gas control and

thermocouple.

• Check the operation of and clean the pilot light and main burner.

• Visually check the unit for any potential problems.

• Inspect plumbing and gas connections.

Note: The water heater may need to be drained during this service. After the
completion of the service, the water heater will take approximately an hour to
heat the water.

17

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.

A list of postcodes is available on the Rheem website (www.rheem.com.au)
indicating known areas where the stainless 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
stainless 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.

It is recommended to install a suitable filter on the cold water supply line to the
water heater if the water supply contains or has a future risk of containing
suspended solids. The Rheem warranty will not cover resultant faults on
components including the stainless steel cylinder due to the effects of sludge
and / or sediment settling in the water heater.

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 and a temperature pressure relief valve.

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.

18

WATER SUPPLIES

WITHIN WARRANTY

SPECIFICATION

5.0 6.0 7.0 8.0 9.0

350

300

250

200

150

100

50

CHLORIDE - mg/L

pH & CHLORIDE

WATER HEATERS (stainless steel cylinder)

acidic alkaline

pH

no warranty applies to a:

-stainless steel water heater

cylinder

0

no warranty applies to a:

-stainless steel water heater cylinder

no warranty applies to a:

-stainless steel water heater

cylinder

10.0

9.5

CHLORIDE AND PH

In a high chloride water supply, the water can corrode stainless steel parts and
cause them to fail.

Where the chloride level exceeds 250 mg / L the Rheem warranty does not apply
to a stainless steel cylinder.

pH is a measure of whether the water is alkaline or acid. In an acidic or very
alkaline water supply, the water can attack stainless 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 a stainless 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 stainless steel cylinder.

Refer to the pH and Chloride chart on page 19.

19

WATER SUPPLIES

SATURATION INDEX (SI)

GAS STORAGE WATER HEATERS - STAINLESS STEEL

corrosive

-1.0

WITHIN WARRANTY

SPECIFICATION

SATURATION INDEX

(calculated @ 80°C water temperature)

very corrosive

very scaling

no warranty applies to a:

temperature pressure relief

valve or a water heater

cylinder unless an expansion

control valve is fitted.

scaling

no warranty applies to a:

stainless steel cylinder

+0.8

0

+0.4

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. 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 stainless steel cylinder.

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 20.

Refer to the cold water connection diagram on page 35 for the position of the
expansion control valve.

20

WATER SUPPLIES

Water Chemistry

Component

Chloride > 250 mg / L

water heater cylinder

pH < 6.0 or > 9.5

water heater cylinder

Total Dissolved Solids (TDS) > 600 mg / L

water heater cylinder

Saturation Index (SI) > +0.4
(if expansion control valve is not fitted)

water heater cylinder
temperature pressure relief valve

Saturation Index (SI) > +0.8

water heater cylinder

TOTAL DISSOLVED SOLIDS

The stainless steel cylinder of the water heater is not covered by the Rheem
warranty when the total dissolved solids (TDS) content in the water is greater
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:

21

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?

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.

Have your plumber fit a flow control valve
to each shower outlet to reduce water
usage.

• Pilot flame alight?

Check the pilot flame is burning by
removing the access cover. Relight the
pilot flame according to the lighting
instructions.

Refer to “Lighting the Water Heater” on page 43.

• Relief valve running

Is the relief valve discharging too much water?

Refer to “Temperature Pressure Relief Valve or Expansion Control Valve
Running” on page 24.

• Thermostat setting

Ensure the thermostat setting is appropriate. You may choose to adjust the
thermostat upwards to gain additional hot water capacity.

Refer to “Gas Control Temperature Dial” on page 13.

Warning: Hotter water increases the risk of scald injury.

• Water heater size

Do you have the correct size water heater 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.

22

SAVE A SERVICE CALL

WATER NOT HOT ENOUGH

Has your hot water usage increased?

•

You may find that due to heavy hot water usage the water temperature may
be lower than normally expected.

CAN’T LIGHT THE PILOT FLAME

•

Is there gas to the water heater?

Check the gas isolation valve on the gas
supply line is open.

• Is there a normal gas supply to the

rest of the premises?

Try lighting another gas appliance to
check. If there is no gas, call the gas
supplier.

WATER HEATER APPEARS TO BE LEAKING

When the water heater is first lit, or after a
large usage of hot water, condensation may
form on and drip from the burner and grille
at the front of the water heater. During
periods of heavy condensation, the
condensate may also form around the base
of the water heater. This is quite normal,
especially in winter months and will dry off
as the water is heated.

The water heater will drip water during the
heating cycle. It is possible for several litres
a day of condensation to discharge from the
flue onto the burner tray especially in cool
conditions. This water is not from the mains
supply but is condensation from the
atmosphere caused by the efficient
operation of the water heater.

Note: During the heating cycle it is not unusual to see water vapour clouds
steaming from the flue terminal. This is normal operation of the water heater.

23

SAVE A SERVICE CALL

TEMPERATURE PRESSURE RELIEF VALVE OR EXPANSION CONTROL VALVE
RUNNING

Normal Operation

•

It is normal and desirable the temperature
pressure relief valve or expansion control
valve (if fitted) allows a quantity of water to
escape during the heating cycle. This
quantity should be equal to approximately
1/50 of the hot water used, as water expands
by this volume when heated. However, if it
discharges more than a bucket full of water
in 24 hours, there may be another problem.

The expansion control valve will discharge
water instead of the temperature pressure
relief valve as it has a lower pressure rating.
A benefit is that energy is conserved as the
discharged water is cooler. This valve is
installed in the cold water line to the water
heater (refer to the cold water connection
diagram on page 35).

• Continuous dribble

Try gently raising the easing lever on the relief valve for a few seconds (refer
to “Relief Valves” on page 9). 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 from the temperature pressure relief valve until

the water heater is cold – then stops until water reheats

The gas control must be turned off using the knob on top of the gas control
thermostat (refer to “Close Down Procedure” on page 47). Phone Rheem
Service or nearest Accredited Service Agent to arrange for inspection.

24

SAVE A SERVICE CALL

HIGHER THAN EXPECTED GAS BILLS

Should you at any time, feel your gas bill is higher than expected, we suggest
you check the following points:

• Is the relief valve running excessively?

Refer to “Temperature Pressure Relief Valve or Expansion Control Valve
Running” on page 24.

• Is one outlet (especially the shower)
using more hot water than you think?

Refer to “Not Enough Hot Water (or No
Hot Water)” on page 22.

• 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 gas. Replace
faulty tap washers, and have your
plumber rectify any leaking pipe work.

• Has there been an increase in hot water

usage?

An increase in hot water usage will result in an increase in water heater
operation.

• Has your water heating tariff rate been increased by your gas retailer since

your previous bill?

Check your previous bill and compare gas rates and charges.

IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU
NEED ASSISTANCE, PHONE RHEEM SERVICE OR THEIR NEAREST
ACCREDITED SERVICE AGENT.

25

INSTALLATION

THIS WATER HEATER IS FOR OUTDOOR INSTALLATION ONLY.
THIS WATER HEATER IS NOT SUITABLE FOR POOL HEATING.
This water heater is for connection to natural gas only.
Check the water heater is suitable for the gas type available.
Refer to the rating label affixed behind the access cover on the water
heater.

INSTALLATION STANDARDS

The water heater must be installed:

• by a qualified person, and

• in accordance with the installation instructions, and

• in compliance with Standards AS/NZS 3500.4 and AS/NZS 5601.1, and all

local codes and regulatory authority requirements.

All packaging materials must be removed from the water heater prior to its
installation. This includes the removal of the cardboard base of the carton from
the underside of the water heater.

WATER HEATER APPLICATION

This water heater is designed for use in a single family domestic dwelling for the
purpose of heating potable water. Its use in an application other than this may
shorten its life.

If this water heater is to be used where an uninterrupted hot water supply is
necessary for the application or business, then there should be 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 was to become inoperable
for any reason. We recommend you provide advice to the system owner about
their needs and building back-up redundancy into the hot water supply system.

Note: AS 3498 requires that a water heater provides the means to inhibit the
growth of Legionella bacteria in potable water. This water heater can satisfy this
AS 3498 requirement provided it is operating and the thermostat setting is 60°C
or higher, including when it is used as an in-series booster water heater for a
solar water heater.

26

INSTALLATION

WATER HEATER LOCATION

The water heater should be installed close to the most frequently used outlet and
its position chosen with safety and service in mind. Make sure people
(particularly children) will not touch the flue terminal. The flue terminal must be
clear of obstructions and shrubbery.

Clearance must be allowed for
servicing of the water heater. The water
heater must be accessible without the
use of a ladder or scaffold.

Make sure the temperature pressure
relief valve lever is accessible and the
access cover, top panel and burner can
be removed for service. Remember you
may have to remove the entire water
heater later for servicing.

The water heater is to be installed at ground or floor level on a stable fireproof
base as acceptable to local authorities. The water heater must also stand
vertically upright with the back of the water heater against or within 25 mm of
an external wall or alternatively against a fireproof screen extending at least
500 mm above, below and either side the flue terminal. Failure to observe this
precaution can cause problems in high wind areas.

A secondary flue is not required.

It is recommended to secure the water heater to the wall. The top of the unit is
to be secured to the wall or screen using the wall bracket provided. Use the
M6.5 masonry anchor provided only if it is suitable for the wall or screen type.
Otherwise select and use an alternative fastener suitable for the application.
Refer to “Wall Bracket” on page 30.

Note: If the base of the water heater is higher than the lowest hot water outlet by
2 m or more, the tank may be subject to a negative pressure (partial vacuum)
which can cause damage to the water heater cylinder. In this instance, an
approved vacuum break valve (RMC AV50A or equivalent) must be installed at
the highest point in the hot water line.

Note: Damage to the cylinder caused by incorrect installation is not covered by
the Rheem warranty.

The water heater must not be installed in an area with a corrosive atmosphere
where chemicals are stored or where aerosol propellants are released.
Remember the air may be safe to breathe, but when it goes through a flame,
chemical changes take place which may attack the water heater.

27

INSTALLATION

The water heater must be located to ensure that the location of the flue terminal
complies with the requirements of AS/NZS 5601.1. As a guide the following
requirements are extracted from the Gas Installations Standard. The distances
are measured along the wall behind the water heater.

• At least 500 mm between the flue
terminal and the edge of any
opening into the building, such as
an openable door or window,
measured horizontally* and
vertically.

• At least 500 mm between the flue
terminal and a return wall or
external corner, measured
horizontally*.

Note: * If these horizontal distances cannot be achieved, AS/NZS 5601.1 states
an equivalent horizontal distance measured diagonally from the nearest
discharge point of the flue terminal to the opening may be deemed to comply.
Check with the local regulator.

WATER CHEMISTRY

Water chemistry which can have a detrimental effect on the water heater and its
operation and / or life expectancy. Refer to “Water Supplies” on page 18 for
information on water chemistry and its effect on the water heater.

It is recommended to install a suitable filter on the cold water supply line to the
water heater if the water supply contains or has a future risk of containing
suspended solids. The Rheem warranty will not cover resultant faults on
components including the stainless steel cylinder due to the effects of sludge
and / or sediment settling in the water heater.

28

INSTALLATION

Model

340

Temp pressure relief valve setting

1400 kPa

Expansion control valve setting *

1200 kPa

Max. mains supply pressure

With expansion control valve

960 kPa

Without expansion control valve

1120 kPa

* Expansion control valve not supplied with the water heater.

MAINS WATER SUPPLY

Where the mains water supply pressure exceeds that shown in the table below,
an approved pressure limiting valve is required and should be fitted as shown in
the cold water connection diagram on page 35.

TANK WATER SUPPLY

If the water heater is supplied with water from a tank supply and a pressure pump
system is not installed, then the bottom of the supply tank must be at least 1 m
above the highest point of the hot water plumbing system, including the water
heater. Care must be taken to avoid air locks. The cold water line to the water
heater should be adequately sized and fitted with a full flow gate valve or ball
valve.

REDUCING HEAT LOSSES

The cold water line to and the hot water line from the water heater must be
insulated in accordance with the requirements of AS/NZS 3500.4. The insulation
must be weatherproof and UV resistant if exposed.

SADDLING - PIPE WORK

To prevent damage to the cylinder when attaching pipe clips or saddles to the
water heater jacket, we recommend the use of self-drilling screws with a
maximum length of 13 mm. Should pre drilling be required, extreme caution must
be observed when penetrating the jacket of the water heater.

Note: If the cylinder is damaged as a result of attaching pipe clips or
saddles to the jacket, any resultant faults will not be covered by the Rheem
warranty.

29

INSTALLATION

masonry
anchor

wall

bracket

bracket

slot

nut

WALL BRACKET

It is recommended to secure the water heater to the wall. The top of the unit is
to be secured to the wall (or screen) using the wall bracket provided. Use the
M6.5 masonry anchor provided only if it is suitable for the wall type. Otherwise
select and use an alternative fastener suitable for the application.

The fastener must be capable of bearing the weight of the water heater so it may
neither work loose, pull away from the wall nor impose any load on the gas and
water pipe work connected to the water heater. Refer to the fastener
manufacturer’s information and recommendations for the type of fastener to use
for the wall type and load bearing requirements.

To fit the wall bracket:

• Slide the wall bracket into the

formed slot at the top rear of the
water heater.

Ensure the angled profile is
facing the wall.

• Mark the wall where the hole is to

be drilled.

• Remove the bracket.

• Drill the hole to receive the

M6.5 masonry anchor or other
suitable fastener.

• Replace the wall bracket with the

angled profile facing the wall.

• Secure the wall bracket to the

wall.

30

INSTALLATION

HOT WATER DELIVERY

This water heater can deliver water at temperatures which can cause scalding.

It is necessary and we recommend that a temperature limiting device be fitted
between the water heater and the hot water outlets in any ablution and public
areas such as a bathroom, ensuite or public amenities, to reduce the risk of
scalding. The installing plumber may have a legal obligation to ensure the
installation of this water heater meets the delivery water temperature
requirements of AS/NZS 3500.4 so that scalding water temperatures are not
delivered to a bathroom, ensuite or other ablution or public area.

Where a temperature limiting device is installed adjacent to the water heater, the
cold water line to the temperature limiting device can be branched off the cold
water line either before or after the isolation valve, pressure limiting valve and
non-return valve to the water heater. If an expansion control valve is required, it
must always be installed after the non-return valve and be the last valve prior to
the water heater.

If a pressure limiting valve is installed on the cold water line to the water heater
and the cold water line to a temperature limiting device branches off before this
valve or from another cold water line in the premises, then a pressure limiting
valve of an equal pressure setting may be required prior to the temperature
limiting device.

Two Temperature Zones Using a Temperature Limiting Device

31

INSTALLATION

CIRCULATED HOT WATER FLOW AND RETURN SYSTEM

If a Rheem water heater is to be installed as part of a circulated hot water flow
and return system, a storage water heater able to provide a hot water outlet
temperature of at least 60°C must be used. Note: The thermostat must always
be set to at least 60°C. Refer to the diagram on page 32.

Circulated Hot Water Flow and Return System – Gas Water Heater

Temperature Limiting Device

A temperature limiting device cannot be installed in circulated hot water flow and
return pipe work. The tempered water from a temperature limiting device cannot
be circulated. Where a circulated hot water flow and return system is required in
a building, a temperature limiting device can only be installed on a dead leg,
branching off the circulated hot water flow and return pipe.

If circulated tempered water were to be returned back to the water heater,
depending on the location of the return line connection on the water supply line
to the water heater, then either:

• water will be supplied to the cold water inlet of the temperature limiting device
at a temperature exceeding the maximum recommended water supply
temperature, or

• when the hot taps are closed no water will be supplied to the cold water inlet
of the temperature limiting device whilst hot water will continue to be supplied
to the hot water inlet of the temperature limiting device.

These conditions may result in either water at a temperature exceeding the
requirements of AS/NZS 3500.4 being delivered to the hot water outlets in the
ablution areas, or the device closing completely and not delivering water at all,
or the device failing. Under either condition, the operation and performance of
the device cannot be guaranteed.

32

TYPICAL INSTALLATION – OUTDOOR LOCATION

INSTALLATION

33

INSTALLATION

Model

8A0340N0

Gas Details – Natural Gas

Storage capacity

Hourly recovery

(natural gas @ 45°C rise)

First hour capacity *

Mass (tank) Cartoned

kg

65

Max. Gas Supply Pressure (kPa)

3.50

Full

kg

215

Main injector orifice (mm)

2.80

Pilot injector number

27

DIMENSIONS AND TECHNICAL DATA

* Based on an inlet water temperature of 15°C.
Letter N is included in the model number, e.g. 8A0340N0, to denote gas type.
Technical data is subject to change.

litres 155 Hourly Gas Consumption (MJ) 40

litres 185 Min. Gas Supply Pressure (kPa) 1.13

litres 340 Burner Test Point Gas Pressure(kPa) 1.00

∅

34

CONNECTIONS – PLUMBING

All plumbing work must be carried out by a qualified person and in compliance
with the Standard AS/NZS 3500.4 and all local codes and regulatory authority
requirements.

All gas work must be carried out by a qualified person and in compliance with
the Standard AS/NZS 5601.1 and all local codes and regulatory authority
requirements.

CONNECTION SIZES

• Hot water connection: Rp 1/2.

• Cold water connection: Rp 3/4.

• Relief valve connection: Rp 1/2.

• Gas inlet (flared compression): Rp 1/2.

WATER INLET AND OUTLET

All pipe work must be cleared of foreign matter before connection and purged
before attempting to operate the water heater. All olive compression fittings must
use brass or copper olives. Use an approved thread sealant such as Teflon tape
on all sealing threads.

An isolation valve and non-return
valve must be installed on the cold
water line to the water heater. An
acceptable arrangement is shown in
the diagram. Refer also to “Hot
Water Delivery” on page 31 and to
“Mains Water Supply” on page 29.

A disconnection union must always
be provided at the cold water inlet
and hot water outlet on the water
heater to allow for disconnection of
the water heater.

cold water connection

This water heater is intended to be permanently connected to the water mains
and not connected by a hose-set. A braided flexible hose or semi-flexible
connector may be used for connection to the water heater, where permitted by
AS/NZS 3500.4.

35

CONNECTIONS – PLUMBING

USE TEFLON TAPE

FIT SUPPLIED INSULATION TO

VALVE AS SHOWN

HEAT TRAP

The hot water outlet on the 8A0340 model is located on top of the water heater.
An external heat trap is required be installed. The heat trap is to be within one (1)
metre of the hot water outlet, before the first hot water branch and have a vertical
drop of 250 mm from the outlet of the water heater.

PIPE SIZES

To achieve true mains pressure operation, the cold water line to the water heater
should be the same size or bigger than the hot water line from the water heater.
The pipe sizing for hot water supply systems should be carried out by persons
competent to do so, choosing the most suitable pipe size for each individual
application. Reference to the technical specifications of the water heater and
local regulatory authority requirements must be made.

TEMPERATURE PRESSURE RELIEF VALVE

The temperature pressure relief valve is shipped behind the access cover. The
temperature pressure relief valve must be fitted before the water heater is
operated. Before fitting the relief valve, make sure the probe has not been bent.
Seal the thread with an approved thread sealant such as Teflon tape - never
hemp. Make sure the tape does not hang over the end of the thread.

Screw the valve into the correct opening (refer to the installation diagram on
page 33) leaving the valve drain pointing downwards. Do not use a wrench on
the valve body - use the spanner flats provided. A copper drain line must be fitted
to the temperature pressure relief valve (refer to "Relief Valve Drain" on page 37).

The valve must be insulated with
closed cell polymer insulation or
similar (minimum thickness 9 mm)
and the insulation installed so as not
to impede the operation of the valve.
The insulation must be weatherproof
and UV resistant if exposed.

An insulation collar is supplied with
the temperature pressure relief valve
and must be placed over the body of
the valve, prior to fitting the valve to
the water heater (refer to the diagram
on page 36).

36

CONNECTIONS – PLUMBING

EXPANSION CONTROL VALVE

Local regulations may make it mandatory to install an expansion control valve in
the cold water line to the water heater. In other areas, an expansion control valve
is required if the saturation index is greater than +0.4 (refer to “Water Supplies”
on page 18).

The expansion control valve must always be installed after the non-return valve
and be the last valve installed prior to the water heater (refer to the cold water
connection diagram on page 35). A copper drain line must be fitted to the
expansion control valve (refer to "Relief Valve Drain" on page 37).

The valve, if installed within 500 mm of the water heater, must be insulated with
closed cell polymer insulation or similar (minimum thickness 9 mm) and the
insulation installed so as not to impede the operation of the valve. The insulation
must be weatherproof and UV resistant if exposed.

RELIEF VALVE DRAIN

DN15 copper drain lines must be fitted to the temperature pressure relief valve
and expansion control valve (if one is installed) to carry the discharge clear of
the water heater. Connect the drain lines to the valves using disconnection
unions. The drain line from the valve to the point of discharge should be as short
as possible, have a continuously downward fall all the way from the water heater
to the discharge outlet and have no tap, valves or other restrictions in the pipe
work.

A drain line from a relief valve must comply with the requirements of
AS/NZS 3500.4.

A drain line must be no longer than nine (9) metres with no more than three
bends greater than 45° before discharging at an outlet or air break. The
maximum length of nine (9) metres for a drain line is reduced by one (1) metre
for each additional bend required of greater than 45°, up to a maximum of three
additional bends. Where the distance to the point of final discharge exceeds this
length, the drain line can discharge into a tundish.

Subject to local regulatory authority approval, the drain lines from the
temperature pressure relief valve and expansion control valve from an individual
water heater may be interconnected.

The outlet of a drain line must be in such a position that flow out of the pipe can
be easily seen, but arranged so discharge will not cause injury, damage or
nuisance. The termination point of a drain line must comply with the requirements
of AS/NZS 3500.4. Drain lines must not discharge into a safe tray.

In locations where water pipes are prone to freezing, drain lines must be
insulated, must not exceed 300 mm in length and are to discharge into a tundish
through an air gap of between 75 mm and 150 mm.

37

CONNECTIONS – PLUMBING

If a drain line discharges into a tundish, the drain line from the tundish must be
not less than DN20. The drain line from a tundish must meet the same
requirements as for a drain line from a relief valve.

Warning: As the function of the temperature pressure relief valve on this
water heater is to discharge high temperature water under certain conditions, it
is strongly recommended the pipe work downstream of the relief valve be
capable of carrying water exceeding 93°C. Failure to observe this precaution
may result in damage to pipe work and property.

GAS INLET

The gas connection is made through the left hand side near the access cover to
the gas control. The pipe work must be cleared of foreign matter before
connection and purged before attempting to light the water heater. An isolation
valve and disconnection union must be installed to allow servicing and removal
of the water heater.

Remove the yellow warning label from the gas control after connecting the gas
supply pipe.

Note: Refer to the Gas Installations Standard AS/NZS 5601.1 for the correct

method of sizing the gas supply pipe to the water heater. The pipe size selection
must take into account the gas input of this water heater (refer to table on
page 34) as well as all of the other gas appliances in the premises.

Warning: Always isolate the water heater before pressure testing the gas
supply system. Disconnect the water heater after the isolating cock to prevent
the risk of serious damage to the gas control. The Rheem warranty does not
cover damage of any nature resulting from failure to observe this precaution.
Refer to rating label for gas type and pressure.

Caution: Care is necessary when tightening fittings into the gas control. The gas
control casting may crack if the fittings are over tightened. Cracked gas control
castings are not covered under the Rheem warranty. A damaged gas control
must be replaced.

38

COMMISSIONING

TO FILL AND TURN ON THE WATER HEATER

The gas pilot or burner must not be lit until the water heater is filled with
water.

• Open all of the hot water taps in the house (don’t forget the shower).

• Open the cold water isolation valve fully to the water heater.

Air will be forced out of the taps.

• Close each tap as water flows freely from it.

• Check the pipe work for leaks.

• Open the gas isolation valve fully.

• Check the gas pipe work for leaks.

• Test the gas supply pressure to the water heater.

Refer to “Gas Supply Pressure Testing” on page 40.

• Test the burner gas pressure and adjust if required.

Refer to “Burner Gas Pressure Testing and Adjustment” on page 41.

• Light the water heater.

Refer to “Lighting the Water Heater” on page 43.

• Test the water heater’s burner operation.

Refer to “Test the Water Heater after Installation” on page 46.

• Replace the access cover.

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 access 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.

Explain to the householder or a responsible officer the functions and operation
of the water heater.

39

COMMISSIONING

GAS INLET PRESSURE

IMPORTANT – CHECK the gas supply pressure at the inlet to the water heater

with the water heater and all other gas burning appliances in the premises
operating (burners alight).

The minimum gas supply pressure for Natural Gas is 1.13 kPa.

If this minimum cannot be achieved, it may indicate the meter or the gas line to
the water heater is undersized. It is important to ensure that an adequate gas
supply pressure is available to the water heater when other gas burning
appliances, on the same gas supply, are operating.

GAS SUPPLY PRESSURE TESTING

To check and adjust the gas supply pressure to the water heater:

1. Ensure all other gas appliances in the premises are operating (burners

alight).

2. Remove the access cover.

3. Close down the gas control (refer to “Close Down Procedure” on page 47)

and close the gas isolation valve to the water heater.

4. Remove the screw from the inlet pressure test point on the left hand side of

the gas control and attach the manometer hose to the test point (refer to the
gas control diagram on page 41 for location).

5. Open the gas isolation valve fully.

6. Light the water heater and ensure the burner is operating (refer to “Lighting

the Water Heater” on page 43).

7. Take the manometer reading (burner must be operating).

The supply pressure must be above the minimum rating.

8. Close down the gas control (refer to “Close Down Procedure” on page 47)

and close the gas isolation valve to the water heater.

9. Remove the manometer hose from the inlet pressure test point and replace

test point screw.

10. Open the gas isolation valve fully.

11. Check the gas inlet pressure test point for leaks.

12. If the gas inlet pressure is correct, then check the burner gas pressure of

the water heater. Refer to “Burner Gas Pressure Testing And Adjustment”
on page 41.

13. If the minimum gas pressure cannot be obtained, check the size of the gas

pipe to the water heater or if adjustment to the main gas supply regulator is
required, then contact your local Gas Authority.

40

COMMISSIONING

gas knob

gas inlet

plastic cover

inlet gas

pilot flame

burner gas

point

burner gas pressure

BURNER GAS PRESSURE TESTING AND ADJUSTMENT

The burner gas pressure must be checked and adjusted (if required) as part of
the commissioning procedure. Refer to gas details in the table on page 34 or
check the rating label of the water heater for the burner test point pressure with
the burner operating.

To check and adjust the burner gas pressure of the water heater:

1. Remove the access cover.

2. Close down the gas control (refer to “Close Down Procedure” on page 47)

and close the gas isolation valve to the water heater.

3. Using a small flat

bladed screwdriver,
lever and remove the
black plastic cover

(pilot, burner & off)

adjustment screw

surrounding the
burner pressure test
point on gas control.

pressure test

4. Remove the screw

from the burner

port

pressure test point on
the right side of the
gas control and attach
the manometer hose
to the test point.

pressure

test point

gas control (shown with temperature dial removed)

adjustment screw

5. Open the gas isolation valve fully.

6. Light the water heater and ensure the burner is operating (refer to “Lighting

the Water Heater” on page 43).

7. Take the manometer reading (burner must be operating).

The burner gas pressure should be:

1.0 kPa (±5%) for this natural gas model.

If adjustment is not required, proceed to step 9.

If adjustment is required, proceed to step 8.

41

COMMISSIONING

8. Remove the temperature dial from the front of the gas control by using a

small flat bladed screwdriver to carefully lever the dial and pull away from
the gas control.

Using a small flat bladed screwdriver, rotate the burner pressure adjustment
screw (P.R.ADJ) clockwise to increase the burner pressure or anticlockwise
to decrease the burner pressure until the manometer reads 1.0 kPa.

After adjusting the burner gas pressure refit the temperature dial.

Note: If the test point pressure cannot be adjusted to within 5% of the
specified value, complete this procedure and phone Rheem Service or their
nearest Accredited Service Agent to arrange for an inspection.

9. Close down the gas control (refer to “Close Down Procedure” on page 47)

and close the gas isolation valve to the water heater.

10. Remove the manometer hose from the burner pressure test point and

replace test point screw.

11. Open the gas isolation valve fully.

12. Light the water heater and ensure the burner is operating (refer to “Lighting

the Water Heater” on page 43).

13. Check the burner pressure test point for leaks.

14. Replace the black plastic cover surrounding the burner pressure test point

on gas control by pushing back into position.

15. Replace the access cover.

TO TURN OFF THE WATER HEATER

If it is necessary to turn off the water heater on completion of the installation,
such as on a building site or where the premises is vacant, then:

• Shut down the gas control (refer to “Close Down Procedure” on page 47).

• Close the gas isolation valve at the inlet to the gas control.

• Close the cold water isolation valve at the inlet to the water heater.

42

LIGHTING THE WATER HEATER

FOR YOUR SAFETY READ BEFORE LIGHTING

Warning: This gas water heater is designed to operate reliably and safely as

long as the operating instructions are followed exactly. You must comply with
these lighting instructions at every stage.

Make sure the water heater is filled with water and the water supply is on,
otherwise serious damage to the stainless steel cylinder and water heater
components may occur.

The installer must check all gas connections for leaks, gas supply pressure and
test point pressure (refer rating label). Remove the access cover at the front of
the water heater to access the gas control (thermostat).

Note: AS 3498 requires that a water heater provides the means to inhibit the
growth of Legionella bacteria in potable water. This water heater can satisfy this
AS 3498 requirement provided it is operating and the thermostat setting is 60°C
or higher, including when it is used as an in-series booster water heater for a
solar water heater.

SAFETY INFORMATION

A.

An igniter button is used to light the pilot. When lighting the pilot follow the
lighting instructions exactly.

DANGER: Never press the igniter button while the gas control knob is
in a numbered position. Before pressing the igniter button, turn the gas
control knob to the “” (off) position and wait five (5) minutes.

B. BEFORE LIGHTING ensure there is no smell of gas near the water heater

and the burner opening. Be sure to smell next to ground level as some gases
can settle there.

C. IF YOU SMELL GAS:

Do not try to light the water heater.

Turn the gas control knob clockwise to the “” (off) position, then turn off
the isolation valve in the gas line to the water heater.

Leave the area and call Rheem Service or a qualified service technician.

D. Use only your hand to turn the gas control knob, never use tools. If the

control knob will not turn by hand, call a qualified service technician. Force
or attempted repair may result in a fire or explosion.

E. If the water heater has been damaged DO NOT attempt to operate it - call

a qualified service technician.

F. DURING LIGHTING: Ensure you KEEP YOUR FACE higher than the gas

control at all times.

43

LIGHTING THE WATER HEATER

LIGHTING INSTRUCTIONS

Using the gas control light the water heater as follows:

1. Stop, read the “Safety Information” on page 43.

2. Remove the access cover by lifting the access cover up and then pulling the
bottom of the cover away and down from the water heater.

3. Depress the gas knob slightly and
turn fully clockwise so the white dot
“” (off position) faces the front,
aligning with gas knob position
indicator.

4. Wait five (5) minutes so any build-up
of unburnt gas can escape. If you
then smell gas, stop and follow “C”
in the “Safety Information” on
page 43. If you do not smell gas,
proceed to step 5.

5. Depress the gas knob slightly and
turn anticlockwise so the red star “
” (pilot position) faces the front,
aligning with gas knob position
indicator.

gas control

6. Depress the gas knob fully (until the red star disappears below the housing)
and after twenty (20) seconds, whilst keeping the gas knob depressed,
repeatedly press the igniter button (for up to forty (40) seconds) until the
pilot flame ignites. The igniter is a red button located below and to the right
of the gas control.

Warning: Keep your face higher than the gas control and clear of the

combustion chamber opening while pressing the igniter.

Note: It is not possible to depress the gas knob fully if the gas control has
activated its safety shut-off feature. In this case, wait five (5) minutes for the
gas control to reset (this allows for any unburnt gas to escape).

7. Keep the gas knob depressed for a further twenty (20) seconds and then
release.

Release the gas knob and check the pilot is still alight - look through the
combustion chamber opening below the gas control.

If the pilot has failed to light or has not remained alight, turn the gas control
knob to the "” (off) position and begin again at step 4.

44

LIGHTING THE WATER HEATER

Note: The next steps will cause the main burner to light, if the water in the tank

needs heating. The flames may be noisy at first. This is normal and will
cease after 2-5 seconds.

8. Depress the gas knob slightly and turn it anticlockwise so the red line
“l” (ignition position) faces the front, aligning with the gas knob position
indicator, and hold there for five (5) seconds.

9. Release the gas knob (the gas knob will automatically turn to the red flame
“ ” (on) position), and listen for the burner noise.

10. If the burner fails to light, depress the gas knob slightly and turn it to the
white dot “” (off) position. Wait five (5) minutes for any unburnt gas to
escape and then begin again at step 5.

Warning: Failure to wait five (5) minutes may result in a fire or

dangerous situation.

11. When the burner remains alight with the gas knob released, turn the
temperature dial so the setting of mid way between ‘3’ and ‘4’ is at the top
of the dial, aligning with temperature dial position indicator. This is the
recommended setting and will give a water temperature of about 60°C.

12. Turn the temperature dial past this position to a higher number setting if a
higher water temperature is required. Refer to “Temperature Adjustment” on
page 13.

13. Replace the access cover.

The main burner will now automatically ignite when heating is required and
extinguish when the water has been heated to the set temperature. If the main
burner does not light at the selected setting, the water may already be at the
selected temperature.

45

LIGHTING THE WATER HEATER

TEST THE WATER HEATER AFTER INSTALLATION

The operation of the water heater must be thoroughly checked by the installer on
completion of the installation.

• The pilot flame should burn with a small blue flame. A luminous yellow or

‘floating’ flame is not acceptable.

• The burner flame must light smoothly and quickly from the pilot flame, and

must go out quietly and completely.

• The main burner flame must be stable, although slight lifting at the front edge

of the burner is acceptable when the burner is cold.

• The main burner flame should be blue, with a clearly defined inner cone -

luminous yellow or "floating" flames are not acceptable.

• Check the test point pressure and compare with the rating label. Refer to “Gas

Supply Pressure Testing” and “Burner Gas Pressure Testing and Adjustment”
on pages 40 and 41. If the test point pressure cannot be adjusted to within
5% of the specified value, refer to Rheem Service or their nearest Accredited
Service Agent.

• If unable to get the water heater working properly, contact Rheem Service or

their nearest Accredited Service Agent.

When satisfied everything is working properly instruct the user in the correct
method of operation.

46

LIGHTING THE WATER HEATER

CLOSE DOWN PROCEDURE

1. Remove the access cover by lifting
the access cover up and then pulling
the bottom of the cover away and
down from the water heater.

2. Depress the gas knob slightly and
turn it clockwise so the red star “ ”
(pilot position) faces the front,
aligning with gas knob position
indicator.

This setting will leave the pilot flame
alight, however the main burner will
not be able to light.

To shut down the gas control

gas control

completely, proceed to step 3.

Note: To reinstate the burner (from the red star “ ” (pilot) position):

• Depress the gas knob slightly and turn it anticlockwise so the red line

“l” (ignition position) faces the front, aligning with gas knob position
indicator, and hold there for 5 seconds.

• Release the gas knob (the gas knob will automatically turn to the red

flame “ ” (on) position) and the burner will ignite when heating is
required and extinguish when the water in the storage cylinder has
been heated to the set temperature.

If the main burner does not light at the selected setting, the water may
already be at the selected temperature.

3. Depress the gas knob slightly and turn it to the white dot “” (off) position
(faces the front), aligning with gas knob position indicator.

This setting shuts the gas control down completely.

Note: To relight the water heater, follow the “Lighting Instructions” on
page 44.

4. Replace the access cover.

Note: When turned back on from the red star “ ” (pilot) position or white dot “”
(off) position, the water heater may take up to an hour to reheat if the water has
lost temperature.

47

DRAINING THE WATER HEATER

Warning: Exercise care, as water discharged from the water heater may be

of a very high temperature.

To drain the water heater:

• Turn off the water heater (refer to “To Turn Off The Water Heater” on

page 42).

• Close all hot water taps.

• Operate the relief valve easing lever - do not let the lever snap back or you

will damage the valve seat.

Operating the easing lever will release the pressure in the water heater.

• Undo the union at the cold water inlet to the water heater and attach a hose

to the water heater side of the union.

Let the other end of the hose go to a drain.

• Operate the relief valve easing lever again.

This will let air into the water heater and allow the water to drain through the
hose.

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Revision Date: 2019 December AQ0901122–A

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