Rheem Multipak MPE02 Technical Document

This water heater must be installed and serviced by a qualified person.
Please leave this guide with a responsible officer.
Owner’s Guide
and
Installation Instructions
Rheem Multipak®
Commercial Hot Water Systems
INSTALLER:
The ONLY suitable flue parts are certified Rheem coaxial flue components
carrying the following label:
DO NOT use any other type of flue parts.
Carefully follow the Installation Instructions.
OPERATOR:
DO NOT OPERATE THIS WATER HEATER:
•Unless a certified Rheem coaxial flue system, venting to the outside through a certified Rheem
terminal, is installed in accordance with the Installation Instructions.
•If a loud continued vibration occurs during operation

2
Warning: Upon completion of the installation and commissioning of the water heater, leave this
guide with a responsible officer or the householder. 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.
RESPONSIBLE OFFICER AND INSTALLER PLEASE NOTE
This Owner’s Guide and Installation Instructions is shared for the Australian and New Zealand markets.
Where the content of this document is specific to either market, it is marked with either
AU for Australian specific content or NZ for New Zealand specific content.
The 862627 models in natural gas and propane gas fuel types are sold in Australia.
References to Universal LP Gas models do not apply to the Australian market.
The 862627 models in natural gas and Universal LP Gas fuel types are sold in New Zealand.
References to propane gas models do not apply to the New Zealand market.
An electronic copy of these Owner’s Guide and Installation Instructions can be downloaded from
rheem.com.au and rheem.co.nz.
Rheem Australia Pty Ltd and Rheem New Zealand Limited are the suppliers of the Rheem range of continuous flow gas
water heaters, manufactured in Japan by Paloma Co., Ltd., a world leader in water heater technology and manufacture.
PATENTS
This water heater may be protected by one or more patents or registered designs in the name of
Rheem Australia Pty Ltd, Rheem New Zealand Limited or Paloma Co., Ltd.
Operation design of the Hot Water System is protected by Australian Patent No 2007201101
TRADEMARKS
® Registered trademark of Rheem Australia Pty Ltd., or Rheem New Zealand Limited.
™ Trademark of Rheem Australia Pty Ltd., or Rheem New Zealand Limited.
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.

3
CONTENTS
This booklet contains important information about your
new water heater, including terms of the Rheem warranty.
We recommend you read pages 7to 17,
and the terms of the Rheem warranty on pages 4 to 6.
The other pages are intended for the installer but may be of interest.
Contents....................................................................................................................................... 3
Rheem Continuous Flow Gas Water Heater Warranty – Australia Only................................ 4
Safety and Warnings................................................................................................................... 7
About your water heater............................................................................................................. 9
Water Supplies........................................................................................................................... 15
Save A Service Call................................................................................................................... 16
Multipak – Technical Specifications........................................................................................ 18
Installation – Water Heater....................................................................................................... 20
Connections – Plumbing .......................................................................................................... 24
Flueing........................................................................................................................................ 25
Connections - Electrical ........................................................................................................... 43
Commissioning.......................................................................................................................... 46

4
RHEEM CONTINUOUS FLOW GAS WATER HEATER
WARRANTY – AUSTRALIA ONLY
CONTINUOUS FLOW GAS WATER HEATER MULTIPAK MODELS MP02-MP06
1. THE RHEEM WARRANTY – GENERAL
1.1 This warranty is given in Australia by Rheem Australia Pty Limited ABN 21 098 823 511 of 1 Alan Street,
Rydalmere New South Wales, and in New Zealand by Rheem New Zealand Limited of 475 Rosebank Road
Avondale Auckland 1026, the suppliers of Rheem continuous flow gas water heaters.
1.2 Rheem offer a trained and qualified national service network who will repair or replace components at the
address of the water heater subject to the terms of the Rheem warranty. Rheem Service, in addition can
provide preventative maintenance and advice on the operation of your water heater. The Rheem Service
contact number in Australia is 131031, with Contact Centre personnel available 24 hours, 7 days a week to
take your call and if necessary to arrange a service call for during normal working hours Monday to Friday
(hours subject to change) or in New Zealand on 0800 657 335.
1.3 For details about this warranty, you can contact us in Australia on 131031 or by email at
[email protected] (not for service bookings), or in New Zealand on 0800 657 335 or by email
at [email protected] (not for service bookings).
1.4 The terms of this warranty and what is covered by it are set out in sections 2 and 3 and apply to water heaters
manufactured after 1st September 2018.
1.5 If a subsequent version of this warranty is published, the terms of that warranty and what is covered by it will
apply to water heaters manufactured after the date specified in the subsequent version.
2. TERMS OF THE RHEEM WARRANTY AND EXCLUSIONS TO IT
2.1 The decision of whether to repair or replace a faulty component is at Rheem’s sole discretion.
2.2 If you require a call out and we find that the fault is not covered by the Rheem warranty, you are responsible
for our standard call out charge. If you wish to have the relevant component repaired or replaced by Rheem,
that service will be at your cost.
2.3 Where a failed component or cylinder is replaced under this warranty, the balance of the original warranty
period will remain effective. The replacement does not carry a new Rheem warranty.
2.4 Where the water heater is installed outside the boundaries of a metropolitan area as defined by Rheem or
further than 25 km from either a regional Rheem branch office or an Accredited Rheem Service
Agent’s / Centre’s office, the cost of transport, insurance and travelling between the nearest branch office or
Rheem Accredited Service Agent’s / Centre’s office and the installed site shall be the owner’s responsibility.
2.5 Where the water heater is installed in a position that does not allow safe or ready access, the cost of that
access, including the cost of additional materials handling and/or safety equipment, shall be the owner’s
responsibility. In other words, the cost of dismantling or removing cupboards, doors or walls and the cost of
any special equipment to bring the water heater to floor or ground level or to a serviceable position is not
covered by this warranty.
2.6 This warranty only applies to the original and genuine Rheem water heater in its original installed location and
any genuine Rheem replacement parts.
2.7 The Rheem warranty does not cover faults that are a result of:
a) Accidental damage to the water heater or any component (for example: (i) Acts of God such as floods,
storms, fires, lightning strikes and the like; and (ii) third party acts or omissions).
b) Misuse or abnormal use of the water heater.
c) Installation not in accordance with the Owner’s Guide and Installation Instructions or with relevant
statutory and local requirements in the State or Territory in which the water heater is installed.
d) Connection at any time to a water supply that does not comply with the water supply guidelines as
outlined in the Owner’s Guide and Installation Instructions.
e) Repairs, attempts to repair or modifications to the water heater by a person other than Rheem Service
or a Rheem Accredited Service Agent / Centre.

5
CONTINUOUS FLOW GAS WATER HEATER MULTIPAK MODELS MP02-MP06
f) Faulty plumbing or faulty gas or power supply.
g) Failure to maintain the water heater in accordance with the Owner's Guide and Installation Instructions.
h) Transport damage.
i) Fair wear and tear from adverse conditions (for example, corrosion).
j) Cosmetic defects.
k) Ice formation in the waterways of a water heater: where the electricity supply has been switched off or
has failed and the water heater has not been drained in accordance with the instructions; or due to an
ambient temperature below -20°C (including wind chill factor).
2.8 Subject to any statutory provisions to the contrary, this warranty excludes any and all claims for damage to
furniture, carpet, walls, foundations or any other consequential loss either directly or indirectly due to leakage
from the water heater, or due to leakage from fittings and/ or pipe work of metal, plastic or other materials
caused by water temperature, workmanship or other modes of failure.
2.9 If the water heater is not sized to supply the hot water demand in accordance with the guidelines in the Rheem
water heater literature, any resultant fault will not be covered by the Rheem warranty.
2.10 In New Zealand this warranty excludes to the extent permissible all implied warranties set out in the Sale of
Goods Act 1908 (New Zealand) and all guarantees set out in the Consumers Guarantees Act 1993 (New
Zealand) to the extent that the goods are acquired for the purpose of resupply in trade consumption in the
course of a process of production or manufacture or repairing or treating in trade other goods or fixtures on
land.
3. WHAT IS COVERED BY THE RHEEM WARRANTY
FOR THE WATER HEATERS DETAILED IN THIS DOCUMENT
3.1 Rheem will repair or replace a faulty component of your water heater if it fails to operate in accordance with
its specifications as follows:
What components are covered
The period from the date
of installation in which
the fault must appear in
order to be covered
What coverage you receive
All components Year 1
Repair and/or replacement of the
faulty component, free of charge,
including labour.
CFWH
(only if the water heater is installed
in a single-family domestic dwelling
with a preset outlet temperature
setting below 76°C)
Years 2 & 3
Repair and/or replacement of the
faulty component, free of charge,
including labour.
The heat exchanger
(if the water heater is installed in a
single-family domestic dwelling with
a preset outlet temperature setting
below 76°C)
Years 4 to 10
Replacement heat exchanger, free of
charge. Installation and repair labour
costs are the responsibility of the
owner.
The heat exchanger
(if the water heater is not installed
in a single-family domestic dwelling
with a preset outlet temperature
setting below 76°C)
Years 2 to 5
Replacement heat exchanger, free of
charge. Installation and repair labour
costs are the responsibility of th
e
owner.
The heat exchanger
(with a thermostat setting greater
than 75
o
C)
Year 1
Repair and/or replacement of the
faulty component, free of charge,
including labour.

6
4. ENTITLEMENT TO MAKE A CLAIM UNDER THIS WARRANTY
4.1 To be entitled to make a claim under this warranty you need to:
a) Be the owner of the water heater or have consent of the owner to act on their behalf.
b) Contact Rheem Service without undue delay after detection of the defect and, in any event, within the
applicable warranty period.
4.2 You are not entitled to make a claim under this warranty if your water heater:
a) Does not have its original serial numbers or rating labels.
b) Is not installed in Australia or New Zealand.
5. HOW TO MAKE A CLAIM UNDER THIS WARRANTY
5.1 If you wish to make a claim under this warranty, you need to:
a) Contact Rheem on 131031 in Australia or 0800 657 335 in New Zealand and provide owner’s details,
address of the water heater, a contact number and date of installation of the water heater or if that’s
unavailable, the date of manufacture and serial number (from the rating label on the water heater).
b) Rheem will arrange for the water heater to be tested and assessed on-site.
c) If Rheem determines that you have a valid warranty claim, Rheem will repair or replace the water heater
in accordance with this warranty.
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 In Australia, our goods come with guarantees that cannot be excluded under the Australian Consumer Law.
You are entitled to a replacement or refund for a major failure and for compensation for any other reasonably
foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to
be of acceptable quality and the failure does not amount to a major failure.
6.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you may have under the
Australian Consumer Law.
7. THE CONSUMER GUARANTEES ACT 1993 (NEW ZEALAND)
7.1 In New Zealand, our goods come with guarantees that cannot be excluded under the Consumer Guarantees
Act 1993 (New Zealand). If the goods fail to comply with the applicable guarantees set out under the
Consumer Guarantees Act 1993 (New Zealand) being the guarantee as to acceptable quality, the guarantee
as to correspondence with description or the guarantee as to repair and parts, or if the goods fail to comply
with any express guarantee given by Rheem, then you are entitled to a replacement or refund and for
compensation for any other reasonably foreseeable loss or damage.
7.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you may have under the
Consumer Guarantees Act 1993 (New Zealand).

7
SAFETY AND WARNINGS
It is important you read the following safety and warnings information.
SAFETY AND WARNINGS
•This water heater is only intended to be operated by persons who have the experience or the knowledge
and the capabilities to do so.
•This water heater is not intended to be operated by persons with reduced physical, sensory or mental
capabilities i.e. the infirm, or by children. Children should be supervised to ensure they do not interfere
with the water heater.
•If the power supply cord or plug is damaged, it must be replaced by a qualified person in order to avoid a
hazard. The power supply cord and plugmust be replaced with a genuine replacement part available from
Rheem. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an
inspection.
•The power lead from the water heater must be plugged into a weatherproof electrical outlet. Take care
not to touch the power plug with wet hands.
•The water heater uses 220 - 240 V a.c. electrical power for operation of the control systems and the
combustionfan. Theremovalof the frontpanelwillexpose220 - 240 V a.c.wiring. It must only be removed
by a qualified person.
•This water heater 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.
The Rheem warranty may not cover faults if safety devices or the relief valve are tampered with or
if the installation is not in accordance with these instructions.
•Temperature controllers must not be fitted to this water heater (862 series) if it is installed as an in-series
gas booster with a solar water heater system because water at a temperature much higher than the
controller setting can be delivered. If a solar water heater is installed to an existing water heater
installation, then all controllers must be disconnected and removed.
•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 the water heater must only be carried out by qualified personnel. Phone Rheem Service or
their nearest Accredited Service Agent / Centre.
•Do not modify this water heater.
•Switch off the electrical supply at the power outlet to the water heater prior to performing general
maintenance. This will prevent the water heater from operating while you clean or spray around the water
heater. Refer to “General Maintenance” on page 12 for additional information.
•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.

ABOUT YOUR WATER HEATER
8
•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 water heater.
Note: LP gas models sold in New Zealand are designed to operate on the Propane / Butane mixture
supplied in New Zealand. An LP gas model has an LFZ suffix in its model number.
•The water heater has a frost protection system to protect against damage by preventing ice forming in the
waterways of the water heater, in the event of freezing conditions occurring. The frost protection system
will be rendered inoperable if electrical power is not available at the water heater. If it is necessary to
switch the power off to the water heater and there is a risk of freezing, then it is necessary to drain the
water heater. Refer “Frost Protection” on page 14 and to “Draining the Water Heater” on page 14.
INSTALLATION NOTES
This water heater must be installed:
•by a qualified person,
•in accordance with the installation instructions,
•in compliance with the Plumbing Code of Australia (PCA) and Plumbing Standard AS/NZS 3500.4,
This water heater is designed for indoor 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 semi-flexible 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,
•in compliance with all local codes and regulatory authority requirements,
•in New Zealand also conforming to Clauses G11, G12 and H1 of the New Zealand Building Code.
Installation and commissioning requirements and details for the installing plumber and licensed electrical
worker are contained on pages 20 to 56.
Mains pressure water supply
The water heater is designed to operate at mains pressure by connecting directly to the mains water supply.
The maximum mains water supply pressure for the water heater is 1,000 kPa. If the mains supply pressure in
your area exceeds 1,000 kPa, an approved pressure limiting valve that does not have non-return valve
characteristics (such as an RMC PSL series valve) must be installed.
A minimum water supply pressure of 140 kPa is required to achieve the rated flow and performance of the
water heater.
Refer to “Mains Water Supply” on page 22 for additional information.
Mounting of the water heater
This water heater must be installed vertically upright with the water, gas and power connections on the
underside, pointing toward the ground. The back of the water heater can be either against a wall or free
standing, depending on the model selected. The water heater must be well secured to the wall or frame
using suitable fasteners that can bear the weight of the product and suitable for the wall or frame type.

9
ABOUT YOUR WATER HEATER
The Rheem Multipak is a bank of two, three, four, five or six continuous flow water heaters
factory manifolded in parallel. All components are factory assembled on a lightweight frame suitable for
either wall or optional floor mounting.
This water heater is designed for the purpose of heating potable water. Its use in an application other than
this may shorten its life.
The Rheem Multipak is designed to provide continuous flow performance with a capacity for small to medium
size developments and is suitable for:
•Outdoor and indoor installation
•Natural Gas or Propane (LPG)
•Energy consumption control
•Domestic Hot Water (DHW)
The Rheem Multipak is a fully engineered system, completely factory assembled, requiring only minimal on-
site work to be completed, as detailed below:
1. Installation & service connections to the package.
a) Gas in b) Cold water in
c) Hot water out d) Optional hot water return (only with pump option)
e) Co-axial flueing for individual internal water heaters.
2. 240V/1Ph/50Hz 10A GPO power supply to each of the water heaters & optional circulating pump.
Power supply timer is required to turn off pump automatically at least four (4) times daily for five (5)
minutes minimum.
3. Final commissioning as per the simple instructions provided.
MULTIPAK – MODELS AVAILABLE & TECHNICAL SPECIFICATIONS
Multipak Model
MPE02 &
MPI02
MPE03 &
MPI03
MPE04 &
MPI04
MPE05 &
MPI05
MPE06 &
MPI06
Input
MJ/hr
410
615
820
1025
1230
Installation
Outdoor or Indoor – Refer to Model Type
Recovery Rate @
50°C rise
25°C rise
L/hr 1645
3290
2470
4940
3290
6580
4115
8230
4935
9870
Peak Flow Rate @
50°C rise
25°C rise
L/min 27
54
41
81
54
108
68
135
81
163
Dimensions
Height (Ext / Int)
Width
Depth (Wall Mount/Floor Mount)
Clearance in Front
(Recommended)
mm
mm
mm
mm
1800 / 1830
820
350/500
800 / 600
1800 / 1830
1180
350/500
800 / 600
1800 / 1830
1540
350/500
800 / 600
1800 / 1830
1900
350/500
800 / 600
1800 / 1830
2260
350/500
800 / 600
Cold Water
BSPF
40mm
Hot Water
BSPF
40mm
Return
BSPF
25mm (with pump option)
Gas
BSPTM
40mm
Approx Weight
(Wall Mount / Floor Mount)
kg 85 / 95 110 / 120 165 / 185 190 / 210 215 /235

ABOUT YOUR WATER HEATER
10
MULTIPAK – MODELS AVAILABLE & TECHNICAL SPECIFICATIONS
Multipak Model
MPE02 &
MPI02
MPE03 &
MPI03
MPE04 &
MPI04
MPE05 &
MPI05
MPE06 &
MPI06
Wall Mount
standard
standard
standard
standard
standard
Floor Mount optional optional optional optional optional
Secondary Circulation Pump
optional
optional
optional
optional
optional
Water Supply Pressure
Max
kPa
800
Min
kPa
140
Gas Supply Pressure Range
Natural
kPa
1.13 – 3.5
Propane
kPa
2.75 – 3.5
Electrical supply
(240V/1Ph/50Hz)
Amps 1.50 2.25 3.0 3.75 4.5
WATER HEATER OPERATION
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.
HOW HOT SHOULD THE WATER BE?
The water heater has a maximum preset outlet temperature setting of
82°C. For applications requiring sanitising temperatures, the outlet
temperature should be set at 82°C. The minimum recommended
preset outlet temperature setting is 60°C.
If the water heater is installed as part of a circulated hot water flow
and return system in a building, the preset outlet temperature setting
of the water heater must be set to at least 60°C.
Note: The preset outlet temperature setting of this water heater
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. When this
water heater is used as an in-series booster for a solar water heater
it can satisfy this AS 3498 requirement provided it is energised and
the booster preset outlet temperature setting is 70°C or higher.
If this water heater is installed as part of a solar water heater system,
the system can deliver water at temperatures from 58°C up to 75°C and possibly higher depending upon the
model of solar water heater installed.
Multipak systems with the suffix /50 are marked “This appliance delivers water not exceeding 50oC in
accordance with AS3498 on the front panel. This model;
must not be installed as an in-series gas booster to a solar water heater, aswater temperature greater
than 50oC can be delivered from the water heater contravening its compliance to AS3498.
must not be installed as part of a circulated hot water flow and return system.
maximum outlet temperature
setting (82°C)
minimum recommended outlet
temperature
maximum recommended
supply temperature to
bathroom, ensuites and
public areas
factory setting

ABOUT YOUR WATER HEATER
11
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
This water heater can deliver water at temperatures which can cause scalding.
We recommend and it may be required by regulations that an approved temperature limiting device be fitted
into the hot water piping to ablution, bathing and public areas when a Multipak water heater is installed. This
will keep the water temperature below the maximum permitted by AS/NZS 3500.4 to these areas.
The water heater uses 240 Volt AC electrical power for operation of the control systems and the combustion
fan. The removal of the front panel will expose 240 V wiring. It must only be removed by a qualified person.
The power lead from the water heater must be plugged into a weatherproof electrical outlet. Take care not to
touch the power plug with wet hands.
SAFETY
This water heater 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 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.
Warning: For continued safety of this water heater it must be installed, operated and maintained in
accordance with the Owner’s Guide and Installation Instructions.
The 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.

ABOUT YOUR WATER HEATER
12
PRECAUTIONS
Where damage to property can occur in the event of the water heater leaking, the water heater must be
installed over 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 “General Maintenance” on page 12, “Minor Six Month Maintenance” on page 12 and “Annual
Service” on page 12.
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 was 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.
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.
The minor maintenance includes:
Inspect around the air inlet, flue terminal and the water heater in general for plant growth.
Trim back any shrubs, bushes or other plants which have encroached around the water heater.
Plant growth across the airlet and flue terminal can interfere with the performance of the water heater.
Inspect around the water heater for insect infestations, such as ants.
Spray insecticide around the water heater if necessary to rid the area of insects. Do not spray the
surface or into the air inlet or flue terminal of the water heater.
Insects encroaching into or nesting in the water heater can interfere with the operation of the water
heater and also damage components.
Check the drain line from the safe tray (if one is installed) is not blocked.
Check and clean line strainers on the cold water inlet and hot water return.
Check and clean filter on CFWH cold water inlet.
MINOR SIX MONTH MAINTENANCE
It is recommended minor maintenance be performed every six months by the dwelling occupant.
The minor maintenance includes:
Inspect around the air inlet, flue terminal and the water heater in general for plant growth.
•Trim back any shrubs, bushes or other plants which have encroached around the water heater.
Plant growth across the air letand flue terminal can interfere withthe performance ofthe water heater.
•Inspect around the water heater for insect infestations, such as ants.
•Spray insecticide around the water heater if necessary to rid the area of insects. Do not spray the surface
or into the air inlet or flue terminal of the water heater.
Insects encroaching into or nesting in the water heater can interfere with the operation of the water
heater and also damage components.
•Check the drain line from the safe tray (if one is installed) is not blocked.
•Check and clean filter on CFWH cold water inlet.
ANNUAL SERVICE
For safe and efficient operation, it is recommended an annual service be conducted on the water heater.
Only genuine replacement parts should be used on this water heater.

ABOUT YOUR WATER HEATER
13
Warning: Servicing of a water heater must only be carried out by qualified personnel. Phone Rheem
Service or their nearest Accredited Service Agent.
The annual service includes the following actions:
•Check and if necessary adjust the gas pressure.
•Check the operation of and clean the burner.
•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.
•Check and clean line strainers on the cold water inlet and hot water return.
•Check and clean filter on CFWH cold water inlet.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater:
•Switch off the electrical supply at the circuit breaker isolating switch to the water heater if there is no risk
of freezing conditions occurring (refer to note 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.
•Close the hot water return isolation valve.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off unless the water heater is drained, otherwise damage could result (refer to “Frost Protection” on page 14
and “Draining the Water Heater” on page 14).
TO TURN ON THE WATER HEATER
•Screw in the drain plugs at the cold water inlet and hot water outletof the CFWH if they have been drained.
•Open all of the hot taps. (don’t forget the shower).
•Open the cold water isolation valve fully at the inlet to the water heater.
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.
•Switch on the electrical supply at the circuit breaker isolating switch.
•The water heater will operate automatically.

ABOUT YOUR WATER HEATER
14
FROST PROTECTION
The water heater has a frost protection system. The frost protection system will protect the water heater from
damage, by preventing ice forming in the waterways of the water heater, in the event of freezing conditions
occurring.
Notes:
•The frost protection system will be rendered inoperable if electrical power is not available at the water
heater. Damage caused by freezing due to the unavailability of power at the water heater is not covered
by the Rheem warranty (refer to “Terms of the Rheem Warranty” on page 6).
•If it is necessary to switch the power off to the water heater and there is a risk of freezing, then it is
necessary to drain the water heater (refer to “Draining the Water Heater” on page 14).
•The water heater is not suitable for installation in areas where the ambient temperature falls below -20°C
(including wind chill factor).
•Refer to “Terms of the Rheem Warranty” on page 6.
DRAINING THE WATER HEATER
To drain the water heater:
•Turn off the water heater (refer to “Turn Off The Water Heater” on page 12).
•Open the pressure relief valve on the Commpak located on the hot manifold.
•Unscrew the two drain plugs, one each at the cold water inlet and hot water outlet, on the underside of
continuous flow water heater.
Water will drain from the water heaters.
•When water stops flowing from the water heaters, close the pressure relief valve.
Note: It is recommended not to screw the drain plugs back in, until the water heater is to be turned on again.
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 20 to 23 The water heater must be installed:
•by a qualified person, and
•in accordance with the installation instructions, and
•in compliance with Standards AS/NZS 3500.4, AS/NZS 5601.1, as applicable under local regulations, and
all local codes and regulatory authority requirements.
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 15.
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 page 15.
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 12.

15
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 heat exchanger in a continuous flow water heater.
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.
SATURATION INDEX
The saturation index (SI) is used as a measure of the water’s corrosive or scaling properties.
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 copper heat
exchanger in a continuous flow water heater.
In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface.
Where the saturation index exceeds +0.80, the Rheem warranty does not apply to a copper heat exchanger
in a continuous flow water heater.
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 15.

16
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any condition or
fault, which is not related to manufacture or failure of a part (refer to “Terms of the Rheem Warranty” on
page 6).
COLD WATER FROM THE HOT TAP
•Is the water heater plugged in and the power outlet switched on?
•Is power available in the premises?
Try using another electrical appliance.
•Is the isolation valve in the gas line open?
•Is there a gas supply to the rest of the premises?
Try lighting another gas appliance.
•Has the gas line been purged of air after installation?
Refer to your plumber.
WATER IS TOO HOT OR NOT HOT ENOUGH
•Is the preset outlet temperature of the water heater higher than required?
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 is fully
WATER TEMPERATURE FLUCTUATES
More than two or three taps in use at the same time may cause a decrease in the hot water flow from the
taps. This can also be evident if the water heater has been installed as an in-series gas booster to a solar
water heater and the solar heated water is at a low temperature.
FAN CONTINUES TO RUN AFTER WATER HEATER OPERATION STOPS
It is the normal operation of the water heater for the fan to continue running after heating of the water is
finished. The fan may run for up to six minutes after the burners extinguish, to prepare for the next ignition.
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 water heater.
PRESSURE RELIEF VALVE DISCHARGING
A pressure relief valve is incorporated into the water heater controls.
This valve protects the water heater, 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 ofthe water
heater 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 water heater. 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 22.

17
ERROR CODE
The water heater provides a diagnostic error code in the event of an interruption to its operation. The error
code is displayed on the controller(s) (if installed) and on the OK MONITOR on the front of the water heater
as a numerical value. If an error code appears:
•Close the hot tap, switch off the electrical supply to the water
heater.
•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 water
heater, turn on a controller and open a hot tap.
If the error code persists, take note of the numerical code, turn off the
hot tap and turn off the controller(s). Phone Rheem Service or their
nearest Accredited Service Agent to arrange for inspection.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE, PHONE
RHEEM SERVICE OR THEIR NEAREST ACCREDITED SERVICE AGENT

18
MULTIPAK – TECHNICAL SPECIFICATIONS
RHEEM WATER HEATERS & STAGING VALVES
•Two (2) to Six (6) Off ‘Rheem Continuous Flow Water Heaters’(CFWH)
•Mounted and plumbed in parallel.
•2nd to 6th water heaters are fitted with staging valve/s.
PLUMBING DETAILS
•Complete cold water and hot water piping, valves and fittings to AS3500.4.
•Complete gas piping, valves and fittings to AS/NZS 5601.1.
•Optional circulating pump complete with valves and fittings to AS3500.4
SKID PACKAGE COMPRISING OF:
•‘Rheem’ water heaters, cold water, hot water, natural gas / LPG manifolds and options are fully
assembled and all mounted on a Galvabond Steel frame. Package is ready for site installation.
•Connection points provided to the package are:
Cold Water Inlet, Hot Water Outlet and Optional Hot water Return
Natural Gas (Standard) or LPG (Optional) Inlet
UNIQUE FEATURES
•Staged operation of CFWH
•Capital and operating cost savings
•Smaller space requirements
STAGING VALVE
A staging valve is provided at the cold water inlet to each heater, excepting the first CFWH, to facilitate
staged operation of CFWH upon increasing flow demand.
Staging valve settings:
1st CFWH 2nd CFWH 3rd CFWH 4th CFWH 5th CFWH 6th CFWH
N/A #2 #3 #4 #5 #6
FRAME OPTION
•Base Frame: An optional structural aluminium alloy floor mounting unit in lieu of wall mounting is
available.

19
CIRCULATION PUMP OPTION
Optional Circulating Pump Package comprising of:
•A 25mm in-line circulating pump in cast bronze designed for secondary hot water circulation.
240V/1Ph/50Hz; IP44 canned motor with three speed setting option.
•Pump is provided with unions, in-line strainer, isolation ball valves, check valve and integrated into
the system with required plumbing fittings.
TECHNICAL NOTES:
1. Heaters must have 60oC or greater temperature setting with this option to prevent proliferation of
‘Legionella Bacteria’.
2. Return piping sizing shall be sized in accordance to AS3500.4.
3. No pressure limiting and other such pipe friction devices shall be installed in this return piping.
4. If such devices are installed return water flow will be restricted and pump will starve of water resulting
in premature failure of the pump and is not covered under warranty.
5. Dry running of the pump will cause irreparable damage to the pump and is not covered under
warranty.
6. Power supply timer is required to turn off pump automatically at least four (4) times daily for five (5)
minutes minimum.

20
INSTALLATION – WATER HEATER
THIS WATER HEATER IS FOR OUTDOOR OR INDOOR INSTALLATION, MODEL DEPENDANT.
THIS WATER HEATER IS NOT SUITABLE FOR POOL HEATING.
Check the water heater is suitable for the gas type available.
(refer to the rating label 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 the Plumbing Code of Australia (PCA), Standards AS/NZS 3500.4 and
AS/NZS 5601.1, and all local codes and regulatory authority requirements, and
•in New Zealand also conforming to Clauses G11, G12 and H1 of the New Zealand Building Code.
Warning: This water heater may deliver water at high temperature. Refer to the Plumbing Code of
Australia, local requirements and these installation instructions to determine if additional delivery
temperature control is required. Refer to “Hot Water Delivery” on page 23.
All packaging materials must be removed from the water heater prior to its installation.
WATER HEATER APPLICATION
This water heater is designed for the purpose of heating potable water. Its use in an application other than
this may shorten its life.
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 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 backup 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. When this water heater is used as an in-series booster for a solar water heater it can satisfy
this AS 3498 requirement provided it is energised and the booster preset outlet temperature setting is 70°C
or higher.
WATER HEATER LOCATION
The water heater should be installed in a position chosen with safety and service in mind. If this water heater
is part of a solar water heater system, it should also be installed close to the solar storage tank. Make sure
people (particularly children) will not touch the flue terminal. The flue terminal and air inlet 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 entire front panel can be removed for service. You must be
able to read the information on the rating plate. Remember you may have to remove a water heater later for
servicing.
The water must be installed vertically upright. Wall mounted versions must be installed on a solid wall
capable of supporting the weight of the Multipak system. Free standing versions can be mounted in any
location on a solid base. The frame must be secured to the floor at all anchor points provided.
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.