The flue components described within these instructions are
ONLY suitable for use with the model(s) that is listed above.
They are NOT suitable, nor are they approved for use with any
other Rinnai flued water heaters.
Rinnai FFU (Aluminium) Flue Systems
Flue Installation Manual
IMPORTANT
Before proceeding with the installation of an FFU coaxial ue system, read this manual thoroughly
to gain a full understanding of the installation requirements.
This appliance must be installed in accordance with:
• Manufacturer’s Installation Instructions
• Current AS/NZS 3000, AS/NZS 3500 & AS/NZS 5601
• Plumbing Code of Australia (PCA)
• Local Regulations and Municipal Building Codes
including local OH&S requirements
This appliance must be installed, maintained and removed
by an Authorised Person.
For continued safety of this appliance it must be installed
and maintained in accordance with the manufacturer’s
instructions.
All Rinnai gas products
sold in Australia are
A.G.A. certified.
Rinnai 2 HW_CF_FFU_IM
INSTALLATION TABLE OF CONTENTS
Warnings & Important Information 4
Before Using Installing Flue Components ........................................................................................................................ 4
Regulatory Information ....................................................................................................................................................... 4
Notice to Victorian Consumers ������������������������������������������������������������������������������������������������������������������������������������������ 4
Cutting The Flue Components ........................................................................................................................................... 5
Common Installation Requirements .................................................................................................................................. 8
Direct Horizontal Flue .......................................................................................................................................................... 8
Important Considerations For Condensate Drain Pipe ��������������������������������������������������������������������������������������������������� 10
Length & Changes Of Direction ���������������������������������������������������������������������������������������������������������������������������������������11
Interconnection Of Condensate Drain Lines ��������������������������������������������������������������������������������������������������������������������11
Common Stack Discharge �����������������������������������������������������������������������������������������������������������������������������������������������11
Areas Subject To Freezing �����������������������������������������������������������������������������������������������������������������������������������������������11
Before proceeding with the installation of an FFU coaxial ue system, read this manual thoroughly
to gain a full understanding of the installation requirements.
Always comply with the following precautions to avoid dangerous situations and to ensure
optimum performance.
Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury and/or death.
DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in
personal injury or death.
WARNINGS: Indicates a potentially hazardous situation which, if not avoided, could result in
personal injury or death.
CAUTIONS: Indicates a potentially hazardous situation which, if not avoided, could result in
minor or moderate injury or damage to the appliance. It may also be used to alert against unsafe
practices.
REGULATORY INFORMATION
Your Rinnai gas continuous ow water heater ue has been certied by the Australian Gas
Association. The A.G.A. Certication Number is shown on the data plate.
These ueing components MUST be installed in accordance with:
Current AS/NZS 3500 and AS/NZS 5601
•
The installation MUST comply with all relevant instructions supplied by Rinnai.
•
Service and removal MUST be carried out by an authorised person.
•
Local regulations and municipal building codes including local OH&S requirements
•
Flue components MUST be installed correctly by an appropriately licensed tradesperson. The
installation of gas, water, and electricity must conform to local regulations.
All dimensions referred to in these instructions are in millimetres, unless otherwise specied.
These instructions ONLY apply to the Rinnai FFU water heater coaxial ueing system. This ue
system utilises pipe components with a aluminium inner pipe and a white plastic outer pipe.
These instructions DO NOT apply to older Rinnai water heater ueing that has either a stainless
steel single skin or stainless steel coaxial construction. If in doubt contact Rinnai.
Before commencing installation, please read the 'Installation Instructions - General', located
inside a pouch behind the front cover of all Rinnai water heater models. The Rinnai internal
water heater range must only be installed with Rinnai water heater ueing as referred to in these
instructions.
Appliances are certied to be installed side by side as shown on page 6. Refer to the operation
and installation manual provided with the appliance for clearance details pertaining to single
appliance installations.
A Rinnai internal continuous ow water heater tted with an FFU ue system is room sealed as
dened in AS/NZS 5601. No ventilation in the space where the water heater is installed is required.
The outer plastic section of the coaxial ue complies with temperature hazard requirements and
can be installed with zero clearance to combustible material.
Notice to Victorian Consumers
The appliance and ue components MUST be installed by a person licensed with the Victorian
Building Authority. ONLY a licensed person will have insurance protecting their workmanship.
So make sure you use a licensed person to install this appliance and ask for your Compliance
Certicate.
For further information contact the Victorian Building Authority on 1300 815 127.
Rinnai 4 HW_CF_FFU_IM
CUTTING THE FLUE COMPONENTS
IMPORTANT
IMPORTANT
Fig. 2
(A)(B)
Fig. 1
x
x + 10 mm
WARNINGS & IMPORTANT INFORMATION
Using the dimensions shown on page 10, calculate
the required number and type of ue components that
are needed to reach from the water heater to the ue
terminal.
When cutting components the outer ue pipe should be
cut to the required length plus 37mm and the inner ue
pipe should be cut to the required length plus 47mm,
this will ensure that the correct penetration is provided
for joining of components.
When inner and outer pipes are re-assembled after
cutting the inner pipe should extend 10mm beyond the
end of the outer pipe. See Fig. 1.
Cutting ue components can create sharp edges, care must be taken to avoid injury, use a le to
remove debris, burrs and sharp edges from cut ends.
Ends that are left unnished can damage the ue seals and result in the ue components no
longer being air or weather tight.
The ONLY COMPONENTS that can be cut are as follows: FFPIPE1000, FFROOFCOWL and FFWALLTERM.
Ensure all ends are cut square (the use of a mitre box will ensure a clean square cut).
LUBRICATING COMPONENTS
37 mm
10 mm
47 mm
WHITE
PLASTIC
(OUTER)
When cutting
flue components
ONLY the male
end is to be cut!
ALUMINIUM
(INNER)
x
A container of "O" ring grease is provided. To ease assembly, lubricate the “O” rings of the inner pipes of each ue
component prior to assembly.
Use only a silicone based "O" ring seal lubricant. DO NOT use petroleum based lubricants such
as petroleum jelly, as such products may cause deterioration.
APPLIANCE SPIGOT DIMENSIONS & CENTRES
When viewed from the front, the ue spigot is aligned
with the centreline of the appliance.
The wall mounting brackets are adjustable by 50mm,
with the minimum setting being 10mm, as such when
adjusted the spigot centre relative to the wall mounting
surface will also change.
For the minimum and maximum position of the spigot
centre relative to the wall mounting surface for each
(A) Flue spigot centreline from edge of applinance
(B) Flue spigot centreline from wall
model covered in this manual "dimension (B) " refer to
the table below.
Dimension (B)
ModelDimension (A)
MinimumMaximum
Innity 26i(REU-VR2632FFUG / REU-VRM2632FFUG)
HD200i(REU-VRM2632FFUC)
Innity 28i(REU-VCM2837FF)
HD28i(REU-VCM2837FFC)
Rinnai 5 HW_CF_FFU_IM
17595135
179105139
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