Rinnai REU-AM2024WD-SA Specification sheet

Continuous flow and temperature control
instantaneous gas water heater
Operation and installation manual
REU-AM2024WD-SA – Infinity 20 external - 20e
REU-AM2626WD-SA – Infinity 26 external - 26e
This appliance must be installed in accordance with:
・Manufacturer’s installation instructions;
・National laws, local regulations and municipal building codes.
This appliance may only beinstalled by a registered Gas installer..
This appliance shall only be installed in an outside location
Read these operation and installation manual carefully before using the appliance
and retain them for future reference .

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Qualitysystemstandard
ISO 9001
The design, development and manufacture of gas water heating appliances done under Rinnai’s quality management
system is certified under the quality management system Standard ISO 9001.
Certified by: Japan Gas Appliances Inspection Association - JIA-QA Center
The Rinnai Infinity water heater is marked as allowed by
the Liquefied Petroleum Gas Safety Association of Southern
Africa

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1.  ThisappliancemayonlybeinstalledbyaregisteredGasinstaller.
All registered installers are issued with a card carrying their registration number. Ask to be shown the card before
allowing the installation work to commence and make a note of the Installer registration number as well as the
installer scope of work as indicated on the back of the card. Be aware that the registration card indicates on the back,
the type of gas that installer is registered to work with. An installer that is registered to work with LPG installations
might not be registered to work on Natural Gas installations. Similarly, an installer that is registered to work with
Natural Gas installations might not be registered to work on LPG installations.
Upon completion of the installation, the installer is required to explain the operational details of the appliance together
with the safety instructions. You will be asked to sign acceptance of the installation and be provided with a completion
certificate. You should only sign for acceptance of the installation when the installation is completed to your satisfaction.
Itisimportanttonotethatiftheapplianceisnotinstalledbytheappropriategradeofregisteredinstaller,
theinstallationwillbeillegal,yourinsurancecompanymayrefusetopayoutanyclaimsintheeventofan
incident,andthemanufacturer’swarrantywillbeinvalid.
Note that your invoice is required in the event that you wish make a guarantee claim. Read carefully the specific
warranty conditions on the reverse.
The appliances either have been designed specifically for use only with LPG or only with Natural gas and may not be
used with any other gas than that for which it has been designed, unless modified by a registered installer qualified
to work with the alternative gas and using the conversion kit supplied by the manufacturer for the specific model.
2.Installernotes
2.1 LPG models
The installation is required to comply with the requirements of SANS10087-1.
Before connecting the gas supply check the rating plate on the side of the heater to be sure the heater is rated for
the same, gas type to which the appliance is connected.
LPG models require an operating pressure is 2,8 kPa at the appliance. A suitable low pressure regulator must be
installed outside. Only use a wall mounted LPG regulator that is rated to supply not less than 3 kg of gas per hour.
Anormal1kgbullnoseregulatorwillnotbecapableofprovidingsufficientgasandwillstarvetheappliance
resultinginpoorperformance.
Only a regulator that complies with SANS1237 may be used in the installation.
Follow the guidelines in SANS 10087-1 to ensure that the gas pipe diameter is sufficient to give the required
operating pressure at the appliance. Failure to observe this requirement may lead to poor appliance performance.
The required gas pipe diameter will be dependent on the distance of the water heater from the regulator.
It is a requirement that a gas isolation valve be installed in the gas line close to the appliance in order to isolate the
appliance from the gas supply in emergency situations or to facilitate maintenance on the appliance.
2.2 Natural Gas models
The installation is required to comply with the requirements of SANS827.
Before connecting the gas supply check the rating plate on the side of the heater to be sure the heater is rated for
the same gas type to which the appliance is connected.
Natural Gas models require an operating pressure is 2,0 kPa at the appliance. A suitable low pressure regulator must
be installed outside.
Follow the guidelines in SANS 827 to ensure that the gas pipe diameter is sufficient to give the required operating
pressure at the appliance. Failure to observe this requirement may lead to poor appliance performance. The required
gas pipe diameter will be dependent on the distance of the water heater from the regulator.
It is a requirement that a gas isolation valve be installed in the gas line close to the appliance in order to isolate the
appliance from the gas supply in emergency situations or to facilitate maintenance on the appliance.
3.Technicalinformation
Description Model Number Type Water
Capacity Gas Type Operating
Pressure Gas Consumption
Infinity 20 REU-AM2024WD-SA D 20 litres/min LPG 2,8 kPa 3,1 kg/h(156MJ/h)
Infinity 26 REU-AM2626WD-SA D 26 litres/min LPG 2,8 kPa 4,0 kg/h(199 MJ/h)
Infinity 20 REU-AM2024WD-SA D 20 litres/min NG 2,0 kPa 156 MJ/h
Infinity 26 REU-AM2626WD-SA D 26 litres/min NG 2,0 kPa 199 MJ/h
Notes: For confirmation of the specific model number and gas type of the installed model refer to the rating plate on
the side of the appliance.
Type D Instantaneous Water Heaters are appliances for outdoor installation only.
TheinformationbelowisonlyapplicabletothespecificRinnai
InstantaneousWaterHeaterslistedbelowSuppliedinSouthAfrica
Modelsizes:20litre,26litre.

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4.SafetyInformation
If there is an apparent gas leak, (smell of gas) close the gas control valve on the appliance. Make sure that there are
no naked flames within 5 meters of the appliance and check for leaks as described below. Never check for gas leaks
with a naked flame as this is extremely dangerous. To check for a gas leak, use a brush dipped in a soapy water
solution (e.g. water with dishwashing liquid added) and apply the solution to all the joints in the system. If there is a
leak then turn off the gas supply at the isolation valve which the installer will provide as a part of the installation. Call
a qualified service technician to examine the appliance and do not use the appliance until the service technician has
declared that it is safe to do so.
(For LPG models) Should you suspect a leak at the cylinder connections (outside the house) then apply the soapy
water solution to the visible joints such as where the regulator fits into the cylinder or where the regulator fits into
the flexible hose, or the joints on the manifold if fitted. If there is a Ieak, then a bubble or bubbles will form. If you are
unable to stop a leak at this point, then turn off the cylinder valve or valves and call a service technician to correct
the fault. As with leaks inside the premises do not use the appliance until the service technician has declared that it
is safe to do so.
Rinnai, constantly striving to improve the products, reserves the right to modify the details given in this
documentation at any time and without notice.
From the time this manual is printed and attached to the product, to the time the product is purchased and installed,
the instructions and warnings may have changed: for Your interest and Your protection we recommend that You
follow the instructions and warnings reported on the most recent version of the manual which is always available at
the authorised Rinnai service company.
Rinnai disclaims any liability due to printing or transcription errors and reserves the right to update and change any
technical and commercial lists without prior notice.
Dear Customer, our compliments for having chosen a Rinnai top-quality product, able to assure well-being and safety
for a long period of time. As a Rinnai Customer you can also count on a qualified after-sales service to guarantee a
constant efficiency of Your appliance.
The following pages are very important and contain useful instructions and suggestions on the correct use of Your
appliance.
Don’t hesitate to contact immediately Your local Rinnai service to provide You a first commissioning of the product
and to check the correct installation: a qualified technician will verify the correct functioning of the product, adjust any
parameter if required and teach You the correct use of it.
GENERALADVISE
Rinnai products are provided with a packaging suitable for transport. The product must be stored in dry environments
and protected from bad weather.
This manual is part of the product and must be left to the new user in the case of property change of the appliance.
The manual must be kept in a safe place and carefully consulted as all warnings provide important safety instruction
for the installation, the use and the maintenance.
This manual contains technical information on how to install the product: for any issue related to the installation,
comply with the national and local laws in force and technical standards. According to legislation in force, the
systems must be designed by qualified technicians. Installation and maintenance must be performed in compliance
with the regulation in force, according to the manufacturer’s instructions and by qualified personnel.
An improper installation or assembly of the appliance (components, accessories, kits, etc.) can cause unexpected
problems to people, animals and property.
The product must be destined to the use for which it is designed for. Any other use will be considered as improper
and therefore potentially dangerous.
In case of any errors in the installation, the use or the maintenance due to non compliance of the laws in force,
Standards or manufacturer’s instructions, the manufacturer is excluded from any contractual and extracontractual
liability for any damages and the appliance warranty is invalidated.
The user may not install or adjust the appliance in any way that requires the removal of the front cover of the unit: to
remove the front cover of the unit you must be certified competent to do so.
IMPORTANT
According to local laws in force, heating and hot water systems are subject to regular maintenance and regular
checking of the heating performance. To comply with these obligations we invite You to contact the authorised Rinnai
service company.
For further information on regulations related to the installation of the water heater or to find out Your closest the
authorised Rinnai service company.

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WARRANTY
Dear Customer,
Our compliments for having chosen a Rinnai product.
The standard Rinnai warranty does not affect the terms of the legal warranty on customer’s good and relates to
Rinnai products purchased.
WHAT IS COVERED?
The warranty covers any defects in materials or workmanship when the product is installed and operated according
to Rinnai installation instructions, subject to the terms within this limited warranty document. This warranty applies
only to products that are installed by a registered gas engineer. Improper installation may void the warranty. This
warranty extends to the original purchaser and subsequent owners, but only while the product remains at the site of
the original installation. The warranty only extends through the first installation of the product and terminates if the
product is moved or reinstalled at a new location.
WHAT WILL RINNAI DO?
Rinnai will repair or replace the product or any part or component that is defective in materials or workmanship,
except as set forth below:
- all repairs must be performed using genuine Rinnai parts.
- all repairs or replacements must be performed by a registered gas engineer.
Replacement of the entire product or replacement of any parts may only be authorised by Rinnai.
Rinnai does not authorise any person or company to assume for it any obligation or liability in connection with the
replacement of a product or heat exchanger. If Rinnai determines that repair of a product is not possible, Rinnai will
replace the product with a comparable product, at Rinnai’s discretion. If a component or product returned to Rinnai is
found to be free of defects in material or workmanship, or damaged by improper installation the warranty claim may
be denied.
HOW DO I GET SERVICE?
Contact the authorised Rinnai service company.
Proof of date of purchase is required to obtain warranty service. You can show proof of purchase with a dated
invoice.
WHAT IS NOT COVERED?
This warranty does not cover any failures or operating difficulties due to accident, abuse, misuse, alteration,
misapplication, acts of God, improper installation, improper maintenance or service, inadequate water quality, scale
buildup, freeze damage or for any other causes other than defects in materials or workmanship. This warranty does
not apply to any product whose serial number or manufacture date has been defaced.
Rinnai is not liable for any special, incidental, indirect or consequential damages that may arise, including damage to
person or property, loss of use, failure to install drain pan under unit, or inconvenience.

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CONTENTS
1.USER’SINSTRUCTIONS.................................................................................................................................. 7
1.1 FEATURES AND BENEFITS ...................................................................................................................... 8
1.2 IMPORTANT SAFETY INFORMATION ....................................................................................................... 9
1.2.1 OPERATIONAL SAFETY INFORMATION ....................................................................................... 10
1.3 WATER TEMPERATURE CONTROL ....................................................................................................... 12
1.3.1 MAXIMUM DELIVERY TEMPERATURES ....................................................................................... 12
1.3.2 OPERATION WITHOUT WATER CONTROLLERS ......................................................................... 12
1.3.3 RINNAI WATER CONTROLLERS ................................................................................................... 12
1.3.4 WATER CONTROLLER COMBINATIONS & CONFIGURATIONS .................................................. 13
1.3.5 UNIVERSAL WATER CONTROLLER (MC-601) OPERATION ........................................................ 14
1.4 TROUBLE SHOOTING ............................................................................................................................. 16
1.4.1 ERROR CODES .............................................................................................................................. 16
1.4.2 TROUBLESHOOTING WITHOUT WATER CONTROLLERS .......................................................... 18
1.4.3 SERVICE ......................................................................................................................................... 18
2.INSTALLER’SINSTRUCTIONS...................................................................................................................... 19
2.1 INSTALLATION WARNINGS ..................................................................................................................... 20
2.1.1 APPLIANCE LOCATION .................................................................................................................. 20
2.2 UNPACKING THE WATER HEATER ........................................................................................................ 21
2.3 DIMENSIONS ........................................................................................................................................... 21
2.4 MAIN COMPONENTS .............................................................................................................................. 22
2.5 GENERAL SCHEME AND OPERATION PRINCIPLES ............................................................................ 23
2.5.1 OPERATION PRINCIPLES .............................................................................................................. 23
2.6 INSTALLATION ......................................................................................................................................... 24
2.6.1 SELECTING A LOCATION ............................................................................................................... 24
2.6.2 WATER CONNECTION ................................................................................................................... 26
2.6.3 GAS CONNECTION ........................................................................................................................ 26
2.6.4 ELECTRICAL CONNECTION .......................................................................................................... 27
2.6.5 CONTROL BOARD DIPSWITCH SETTING .................................................................................... 27
2.7 WATER CONTROL ................................................................................................................................... 28
2.7.1 GENERAL INFORMATION .............................................................................................................. 28
2.7.2 UNIVERSAL WATER CONTROLLER (MC-601) INSTALLATION ................................................... 30
2.8 COMMISSIONING .................................................................................................................................... 31
3.MAINTENANCEINSTRUCTIONS................................................................................................................... 33
3.1 PCB INTERFACE LAYOUT AND FUNCTIONS ........................................................................................ 34
3.2 DATA TRANSFER BETWEEN PCB’S ....................................................................................................... 35
3.3 WATER FLOW CHART ............................................................................................................................. 35
3.4 FLOW CHART ........................................................................................................................................... 36
3.5 WIRING DIAGRAM AND DIAGNOSTIC POINTS ..................................................................................... 37
3.6 MAINTENANCE ........................................................................................................................................ 38
3.6.1 FLUSHING THE HEAT EXCHANGER ............................................................................................. 38
3.6.2 MANUAL DRAINING OF THE WATER HEATER ............................................................................. 40
3.7 TECHNICAL DATA .................................................................................................................................... 41

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1.USER’SINSTRUCTIONS
The following section provides instructions for proper use of the product.
This section is intended for the use by qualified technical personnel and end users.

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1.1FEATURESANDBENEFITS
Congratulations on purchasing the latest technology temperature controlled Rinnai continuous flow water heating
system.
The Rinnai continuous flow water heater products NEVERRUNOUT of hot water. Whilst electricity, water and gas
supplies are connected, hot water is available whenever hot water taps are open.
Built into the main micro-processor is the facility to LIMITTHEMAXIMUMTEMPERATURE of the hot water
supplied. The water temperature may be limited to various values. This is particularly useful when the hot water unit
is installed where young children or the infirm may be using the hot water.
The Rinnai continuous flow water heater products are fan-assisted (power flued) appliances. This makes them
COMPACT, saving both floor and wall space.
The temperature of hot water is CONSTANTLYMONITORED by a BUILT-INSENSOR. If the temperature of the hot
water rises to more than 3°C above the selected temperature the burner is turned OFF and only turned ON again
when the temperature falls below the selected temperature.
The burner lights automatically when the hot water tap is opened, and goes out when the tap is closed. IGNITIONIS
ELECTRONIC, so there is no pilot light. When the hot water tap is off, no gas is used.
‘Deluxe’ or ‘Universal’ Water Controllers are available as an optional extra. Depending on the models chosen, these
offer the following features:
- Bath fill function (Deluxe Bathroom Control Only).
- Voice Prompting (Deluxe Control Only).
- Clock (Deluxe Control Only).
- Up to four water controllers can be fitted.
For further information regarding Deluxe water controllers please contact the authorised Rinnai service company.
The “Smartstart®” system when fitted can pre-heat the water in the pipe-work between the water heater and the hot
water outlets. This results in water savings and reduces waiting time for heated water at the outlets.
Operating NOISELEVELISVERYLOW.
ERRORMESSAGEAREDISPLAYED on the digital status monitor on the front panel, assisting with service.

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1.2IMPORTANTSAFETYINFORMATION
Meaning of the symbols used in the manual for important safety information:
IMPORTANT
Indicates a situation of potential serious danger with the risk of serious damage and/or risk of death.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may in moderate or minor injury or
property damage.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in or minor injury or
death or serious injury.
NOTE
Indicates a potentially hazardous situation which may cause personal problems or damage of
moderate or minor entity; or suggesting the correct use of the product.
Indicates a condition which must be complied.
Indicates a condition which should be avoided.
Indicates a ground connection for the prevention of an electric shock.
Warns of a risk of fire. Keep the area clean and free from flammable materials.
Warns of a risk of injury or property damage when contacting.
IMPORTANT
Theapplianceshouldbeinstalledbyqualifiedpersonnelonly,inoutdoor,alwaysopenairand
wellaeratedareas.Usetheapplianceonlyforwaterheating.
Do not modify this appliance. Do not attempt to repair, replace or open sealed parts or disassemble the appliance:
improper adjustment, alteration, service or maintenance could significantly affect the safety of the product. Contact
the Rinnai service if you detect any unusual condition.
Use original parts to repair the appliance.
In case of unusual noise, vibration or smell, stop the appliance and contact
the Rinnai service for further information.
If you smell gas:
isolate the main gas supply;
open doors and windows;
call your gas engineer;
use a telephone outside the building.
In case of earthquake, fire, gas leak, unusual noise or smell, isolate the
gas and power supply and open doors and windows.
Excessively hot water is dangerous, especially for the infirm, the elderly
and young children. The appliance allows you to control the temperature of
your hot water to safe levels and for all kinds of use.
Water temperature over 50°C can cause severe burns instantly or even
death from scalding. Hot water at 60°C can severely burn a child in less
than a second. At 50°C it takes five minutes.
Always test the temperature of the water before bathing or showering.
Do consider setting your hot water production at a maximum temperature
of 50°C.
HOT

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Do not store flammable objects near the appliance: it could cause a
product failure or fire.
Do not spray aerosols in the vicinity of this appliance while it is in operation.
Check that the appliance is supplied with the correct gas type and pressure
according to the data plate: ensure that the gas in use matches with the
gas indicated on the data plate. If not, there could be incomplete burning of
the gas, resulting in toxic emissions and/or product failure.
Do not insert objects into the flue outlet. Do not spray water directly into the
flue outlet. Keep, trees, shrubs, etc. well clear of the flue outlet.
On colder days steam may discharged from the flue outlet. This condition
is normal for high efficiency appliances and does not indicate a fault.
Check the main gas valve to make sure it is opened before using the
appliance and check the gas pressure is correct.
Metal flexible pipes are recommended for gas and water supply: rubber
hose might get damaged.
It is recommended to install valves on the gas and water pipes to allow an
easier maintenance and to increase safety in case of emergency.
Check the voltage at the power outlet to make sure it is within the
appropriate range before use.
Ensure the electrical system is provided with an appropriate grounding,
otherwise the appliance could be severely damaged or operate improperly
Using a multiple socket should be avoided.
If the supply cord is damaged, it must be replaced by the manufacturer, its
service agent or similarly qualified persons in order to avoid a hazard.
Prior to use after installation or if the appliance has not been used for a
long time let the hot water flow for a while before using.
Do not touch the unit cover or the flue outlet.
It is recommended the installation of a system to collect and drain water
under the appliance in the case of water leakage to prevent material and
property damages.
1.2.1 OPERATIONAL SAFETY INFORMATION
The following instructions and warnings describe some of the important operational features of the water heater.
IMPORTANT
Thisapplianceisnotintendedforusebypersons(includingchildren)withreducedphysical,
sensoryormentalcapabilities, orlackofexperienceand knowledge, unless theyhavebeen
givensupervision or instructionconcerning useoftheappliancebyapersonresponsiblefor
theirsafety.Childrenshouldbesupervisedtoensurethattheydonotplaywiththeappliance.
Always test the temperature of the water before bathing
or showering to avoid scalding and burn.
Whilst hot water outlets are open the set temperature
may be lowered. However they cannot then be raised
above 43°C. In addition transfer of ‘priority’ between
controllers is not possible. These are safety features.
Data plate
Gas shut-off valve
Gas valve
Water valves
Flexible pipes
Gas
ColdHot
Grounding
Grounding
HOT!

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OFF!
Depending on the weather conditions and the length
of the pipe between the hot water unit and the outlet in
use, there may be a variation between the temperatures
displayed at the water controller and the temperature of
the water at the outlet.
At low water flows, the hot water unit may extinguish
without warning. Opening the tap further will restart the
heating appliance.
Kitchen Bathroom Kitchen
As a safety precaution, if a kitchen water controller’s
temperature is set above 50°C, transferring and then
returning ‘priority’ to the kitchen water controller will
result in a default set temperature of 50°C being
selected. This is a safety feature.
Do not push the On/Off button on any water controller
when the water heater ‘In Use’ indicator is illuminated
as this will turn off the water heater causing the water
to go cold. Someone maybe in the middle of having a
shower or filling a bath.
43°C 55°C
S
O
L
V
E
N
T
The delivered water temperature is controlled
automatically. The flow may vary depending on the
delivery temperature selected and the ambient water
temperature.
To clean your water controller use a soft damp cloth
with a mild detergent. Do not use solvents!
Frost protection
Make sure that the power cord of the appliance is plugged-in and the
electrical power is always available.
The frost protection system activates only when the appliance is electrically
powered and switched ON.
All pipes must be wrapped with insulating materials to prevent heat loss.
The thickness of insulation should be between 25mm and 50mm according
to outdoor temperatures. Electrical hot wires could be installed to protect
pipework subjected to extreme cold or wind chill conditions. Hot wire use is
recommended if the case of temperature drops below zero.
If extremely freezing conditions are expected, turn off water and gas,
and drain all water from the appliance. If power and the automatic frost
protection are connected, freezing will be prevented. (Anti-frost protection
is fitted as standard equipment on all hot water units)
If water pipes are frozen, there would not be water flow in the system.
Use a heat source (e.g. hair dryer) to unfreeze the frozen components
and pipes. Before using the appliance after defrosting contact the Rinnai
service to verify possible damages.

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1.3WATERTEMPERATURECONTROL
The purpose of a Temperature Controller is to enable the user to have localised control over the hot water supply.
Used correctly, the hot water unit will supply hot water at the temperature selected, even when the water flow is
varied, or when more than one tap is used.
The temperature of outgoing hot water is constantly monitored by a built-in sensor.
If the temperature of the outgoing hot water rises to more than 3°C above the selected temperature shown on the
digital monitor (or the pre-set limit when water controllers are not fitted) the burner will automatically go out. The ‘in
use’ indicator will also go out.
The burner will ignite again once the outgoing hot water temperature falls to that shown on the digital monitor (or the
pre-set limit of the appliance).
Rinnai continuous flow water heaters can be programmed to deliver higher temperatures from the master water
controller, or may be programmed to restrict the maximum available delivery temperature.
Contact Rinnai for more details.
1.3.1 MAXIMUM DELIVERY TEMPERATURES
Rinnai continuous flow water heaters are factory pre-set to 55°C maximum delivery temperature.
Each temperature controller is factory pre-set to 50°C maximum delivery temperature can be individually
programmed.
For the majority of applications, the factory pre-set temperature is appropriate; in the unlikely event this is not the
case this setting can be increased or decreased by an authorised person such as a licensed plumber.
Adjustments to the operation of your hot water unit can be made with any of the temperature controllers.
1.3.2 OPERATION WITHOUT WATER CONTROLLERS
Rinnai continuous flow water heater products do not use a pilot light. When installed and operated, the opening
of any hot water tap will automatically start the appliance. Once water is flowing through the appliance the burner
will be ignited by electronic ignition. When the hot water tap is closed and water flowing through the appliance has
stopped the burner flame will extinguish.
1.3.3 RINNAI WATER CONTROLLERS
Universal and Deluxe water controllers can be used together and will function as described in the dedicated section
of this manual. Refer to “Water controller combinations & configurations” to confirm the maximum number and
combination of water controllers that can be fitted to your water heater model. Other manufacturers water controllers
are NOT compatible with Rinnai water heaters.
Location
Water controllers must be installed in shaded and clean locations. They should be fitted out of reach of children
(suggested height from floor to be at least 1500 mm).
Water resistance
The MC-601 universal water controller is a water resistant device, however excessive exposure to water such as
immersion may result in damage to the water controller. Durability of water controllers is improved when positioned
outside of the shower recess.

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IMPORTANT
Controllersmustbeinstalledatleast400mmabovethehighestpartofasink,basinorbath.
Donotimmersethewatercontrollerintowater.
Avoiddirectexposuretowaterorsteamastheseconditionsmaycauseamalfunction.
Whencleaningyourwatercontrolleruseonlyadampclothandamilddetergent.
Temperature control
Water controllers allow precise temperature control by the user. When used correctly, the hot water unit will deliver
the selected temperature, even when the water flow is varied, or more than one tap is in use.
Only one MC model water controller can be designated as a ‘Master’ water controller and this is normally used in the
kitchen. All the remaining water controllers are designated as ‘Sub’ water controllers and are for use in bathrooms,
toilets and laundries.
The maximum temperature limit for all ‘Sub’ water controllers is restricted to 50°C to minimise the risk of burns in
these areas.
Each water controller can be individually programmed; however the water heater can only deliver one set
temperature at any time. The available temperatures (°C) are as follows:
Water Controller
Temperatures (°C)
Master (MC) 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50, 55, 601, 651
Sub (MC or BC) 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50
1 temperature available after PCB settings adjustment.
For hygiene in sanitary areas such as bathrooms, the suggested temperature should be 37°C ~ 43°C.
The above is a suggestion only, as you may find higher or lower temperatures more comfortable, however
maintaining lower temperatures also helps to save energy.
To obtain water temperatures lower than 37°C, simply open the cold water tap and add cold water until the desired
lower temperature is reached.
Universal water controllers allow temperature selection. Deluxe water controllers allow temperature selection, have a
clock function and, Deluxe Bathroom water controllers, have a shower saver/bath fill function.
Contact the authorised Rinnai service company for further information regarding Deluxe water controllers.
1.3.4 WATER CONTROLLER COMBINATIONS & CONFIGURATIONS
A maximum of 4 water controllers can be fitted.
Any combination of deluxe and universal controllers can be used with the following limitations:
● Only ONE master controller can be installed. This can be a MC-100V, or a MC-601 (when programmed as a
master controller). Note that when a MC-100V is fitted it will always functions as a master controller, this is
the default setting and cannot be changed.
● Up to TWO BC-100V water controllers can be installed.
● The FOURTH water controller in any installation MUST BE a MC-601.
When multiple temperature controllers are used they allow the temperature to be set from various locations by
pushing the transfer button which gives that controller priority over the system.
The temperature selected by the controller with priority will be available to all outlets.
Communication cable Lengths and Sizes
The communication cable for the temperature controller should be a non-polarized two-core cable with a minimum
gauge of 0.64 mm(22AWG). The maximum cable length from each controller to the water heater depends on the
total number of wired controllers connected to the water heater
Number of Wired
Controllers
Maximum Cable Length for each
Controller to Water Heater
1 100 m
2 50 m
3 or 4 20 m

14
1.3.5 UNIVERSAL WATER CONTROLLER (MC-601) OPERATION
Indicates the temperature selected.
Error messages flash in event of a fault.
DIGITAL MONITOR
Used to select water temperature.
TEMPERATURE CONTROL BUTTONS
Indicates that the hot water heater is on.
WATER HEATER ON INDICATOR
Used to switch the water heater on and off.
ON/OFF BUTTON
Indicates if this water controller is in control of water
delivery temperature.
CONTROLLER PRIORITY INDICATOR
Used to transfer control priority between water
controllers. The water controller with priority has
command of the hot water delivery temperature.
PRIORITY TRANSFER BUTTON
Indicates that a water heater is delivering hot water.
WATER HEATER 'IN USE' INDICATOR
Turning on
If the water controller is switched off (no digits displayed in the digital
monitor window) press the On/Off button once. The ON indicator will
illuminate, indicating that the hot water unit will be ready to supply hot
water once a hot water tap is opened.
Adjusting temperature
Select the desired temperature using the Hot water temp or buttons
until the required temperature is displayed on the digital monitor.
To operate the hot water unit, open any hot water tap. This will
automatically light the burner providing hot water. The water heater ‘In Use’
indicator will illuminate on the water controller(s).
Once the hot water is running, if the set temperature is either too hot
or cold press the Hot water temp or buttons until the desired
temperature is reached.
NOTE
Whilsthotwateroutletsareopen,thesettemperaturemaybeloweredtoaminimumof37°C.For
safety,itcannotthenberaisedabove43°Cuntilallhotwatertapsareclosed.
Temperatures higher than 50ºC must not be able to be selected on controllers installed in
bathrooms,ensuitesortoilets.Thisistohelpreducetheriskofburnsfromhotwater.Ifthisis
notthecase,thecontrollershavebeenincorrectlyinstalled.Contactyourinstaller.
The'beep'soundcanbemutedbypressingthe and buttonssimultaneouslyformorethan
3seconds.Tocancelsoundmuting,simplyrepeattheprocess.
CAUTION
Alwayscheckoutletwatertemperaturebeforeuse.Theparent/carerMUSTcheckthe
temperaturebeforeplacingdependantsincontactwithhotwater.
Transferring priority
To control the water delivery temperatures when using two or more water
controllers it is necessary to have priority transferred to the water controller
you wish to use. Transferring of priority will NOT be possible if the ‘In Use’
indicator is currently illuminated, as this indicates hot water is flowing and
that another water controller already has priority.
An illuminated priority indicator confirms that the desired water controller
is in control of the water delivery temperature. If the priority indicator is not
illuminated press the priority transfer button once. The priority indicator
will illuminate, indicating that hot water temperature control has been
transferred and that the hot water unit will be ready to supply hot water
once a hot water tap is opened.
HOTHOT
COLDCOLD
ON!ON!

15
Loc function
To prevent tampering and increase the safety level of the product,
especially for children, it is possible to lock the control panel.
To lock the panel it is necessary to press, and keep pressed for about
five seconds, the ‘Priority’ keys and the key to increase the temperature
(up arrow) (Fig.1). To unlock the command it is sufficient to repeat the
procedure of blocking commands.
When the panel is locked, the display shows ‘LOC’ (Fig.2) alternating with
the selected temperature on the display. All connected commands will be
locked and will display the same flashing text.
Fig. 1
Fig. 2

16
1.4TROUBLESHOOTING
Rinnai continuous flow water heaters have a self diagnostic capability. If a fault occurs, an error code will flash on the
digital monitor of your water controllers. This assists with diagnosing the fault, and may enable you to overcome a
problem without a service call. Please quote the code displayed when enquiring about service.
You may be able to clear the error code simply by turning the hot water tap OFF, then ON again. If this does not
clear the error code, try pushing the On/Off button OFF, then ON again, or turning the power for unit OFF, waiting 10
seconds and then ON again.
If the error code still remains, contact Rinnai for advice.
1.4.1 ERROR CODES
Code Description Remedy
-Noticeable reduction
in water flow. Inlet water filter needs to be cleaned - Service call.
03
Power interruption
during bath fill (water
will not flow on power
reinstatement)
Turn off all hot water taps. Press On/Off twice.
10 Air Supply or Exhaust
Blockage Service Call
11
No Ignition
(heater not turning
on)
Check that the gas is turned on at the water heater, gas meter, or
cylinder.
If the system is LPG, make sure that gas is in the tank.
Ensure appliance is properly grounded.
licensed
professional
only
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches and programming parameters are set properly.
Ensure igniter is operational.
Check igniter wiring harness for damage.
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure all burners are properly seated.
Remove burner plate and inspect burner surface for condensation
or debris.
Check the ground wire for the PC board.
12 No Flame
Check that the gas is turned on at the water heater, gas meter, or
cylinder.
Check for obstructions in the flue outlet.
If the system is LPG, make sure that gas is in the tank.
licensed
professional
only
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure condensation collar was installed properly.
Verify dip switches and programming parameters are set properly.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Disconnect and reconnect all wiring harnesses on unit and PC
board.
Check for DC shorts at components.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation
or debris.

17
Code Description Remedy
14 Thermal Fuse has
activated
Check for restrictions in air flow around unit and exhaust outlet.
licensed
professional
only
Check gas type of unit and ensure it matches gas type being used.
Check for low water flow in a circulating system causing short-cycling.
Ensure dip switches and programming parameters are set to the
proper position.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check heat exchanger for cracks and/or separations.
Check heat exchanger surface for hot spots which indicate blockage
due to scale build-up. Refer to instructions in manual for flushing
heat exchanger. Hard water must be treated to prevent scale build
up or damage to the heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
16
Over Temperature
Warning (safety
shutdown because
unit is too hot)
Check for restrictions in air flow around unit and exhaust outlet.
licensed
professional
only
Check for low water flow in a circulating system causing short-cycling.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for blockage in the heat exchanger.
19 Electrical Grounding Check all components for electrical short.
21 Incorrect dipswitch
setting detected Check dipswitch settings
32 Outgoing Water
Temperature Sensor Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
33
Heat Exchanger
Outgoing Temperature
Sensor
41 Outside temperature
thermistor
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
52 Modulating Solenoid
Valve Signal
Check modulating gas solenoid valve wiring harness for loose or
damaged terminals. Measure resistance of valve coil.
61 Combustion Fan
Ensure fan will turn freely.
Check wiring harness to motor.
Measure resistance of motor winding.
65 Water flow control
fault Replace the Water flow control device.
70 PC Board Replace the PC Board.
71 Solenoid Valve
Circuit Replace the PC Board.
72 Flame Sensing
Device
Verify flame rod is touching flame when unit fires.
Check all wiring to flame rod.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking
flame at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
LC#
LC0,
LC1...
Scale Build-up in
Heat Exchanger
(when checking
maintenance code
history, “00” is
substituted for“LC”)
LC, LC0~LC9 indicates that there is scale build up in the heat
exchanger and that the heat exchanger needs to be flushed to
prevent damage. Refer to flushing instructions in manual.
Hard water must be treated to prevent scale build up or damage to the heat
exchanger. To operate the water heater temporarily until the heat exchanger
can be flushed, push the On/Off button on the temperature controller 5
times. Repeated LC codes will eventually lockout the water heater.
Please call the authorised Rinnai service company.

18
1.4.2 TROUBLESHOOTING WITHOUT WATER CONTROLLERS
If you have not installed temperature controllers and experience the following symptoms, please carry out the
suggestions below or check status monitor and remdy of 1.4.1. If symptoms continue, please contact Rinnai for
advice.
Description Remedy
The unit does not attempt to start at all. Check the power is on at the unit.
Check the isolation valves at the unit are open.
The unit starts then shuts down immediately.
Check the power is still on.
Check the gas isolation valves at the unit and the gas
meter are fully open.
Open your hot water tap fully.
The unit starts then the water goes cold. Check the power is still on.
Open your hot water tap further.
NOTE
Faultscausedbyinsufficientgassupply,insufficientwatersupply,gasquality,waterquality,
installationerrorsoroperationerrorsarenotcoveredbythewarranty.
1.4.3 SERVICE
NOTE
Aregularmaintenanceshouldbemadetopreservetheapplianceintegrityandtokeepsafety,
efficiencyandreliabilityunchanged.
Watercontrollersand waterheaters donot containuserserviceableparts and mustonlybe
servicedandrepairedbyanauthorisedperson.
Rinnaihasaserviceandsparepartsnetworkwithpersonnelwhoarefullytrainedandequipped
togivethebestserviceonyourRinnaiappliance.Ifyourappliancerequiresservice,pleasecall
theauthorisedRinnaiservicecompany.
Whenmakinga serviceenquiry,havingboththemodelandserialnumbersavailable,willhelp
ourstaffquicklyidentifyyourapplianceandbetterattendtoyourneeds.
Always keep the appliance clean.
Unplug the appliance and turn the main gas valve off before to proceed
with any cleaning or maintenance.
Clean the chassis and the remote controller using soft cloth only.
After maintenance (or cleaning), check to ensure that all the components
of the appliance are intact and connected in the correct way. Exhaust gas
leakage could be harmful for health or result in death.
The water heater has a filter on the cold water inlet connection. This filter
will need to be cleaned occasionally. How often will be determined by the
local water condition; contact Rinnai or ask your installer for information.
Isolate the cold water inlet and hot water outlet with the valves near the
heater. Release the pressure in the heater by unscrewing the drain valve.
Then remove the filter, clean it and replace it.
If the inlet filter is clogged up, it could decrease the performance of the
appliance and shorten its service life. The user should clean the filter
regularly to preserve a proper operation and to prevent the appliance
failure.

19
2.INSTALLER’SINSTRUCTIONS
The following section provides specific instructions for proper installation of the product.
This section is intended for the use by qualified technical personnel.

20
2.1INSTALLATIONWARNINGS
WARNING
This section contains technical information concerning the installation of the product. The regulation in
force and the code of practice must be followed for every aspect concerning the installation (safety and
security, environment protection, etc…). According to all applicable regulations and requirements, the
systems must be designed by qualified professionals only.
The Rinnai Infinity is conceived as continuous flow water heater. The appliance is suitable for domestic use to
produce hot water. The appliance must be power plugged, gas, water and connected to a hot water delivery system
suitable for the water heater power and features.
Rinnai gas appliances must be installed by qualified personnel only, according to local regulations, to the law in force
and following the principles of the code of practice.
2.1.1 APPLIANCE LOCATION
This appliance is designed for ‘Outdoor’installationonly. As such, it must be located in an above ground open air
situation with natural ventilation, without stagnant areas, where gas leakage and products of combustion are rapidly
dispersed by wind and natural convection.
NOTE
Thewaterheatercanbeinstalledoutdoorwithnoprotectionsagainstrain,snow,etc.Allpipes
mustbewrappedwithappropriateinsulatingmaterialstopreventfreezing.
Theminallowedtemperatureis-20°C(whenprotectedfromdirectwindexposure).
This appliance must be mounted on a vertical structure with the water and gas connections on the underside pointing
downwards. Location of the appliance flue terminal must be in accordance with local and national laws.
This appliance must be placed as close as practicable to the most frequently used hot water outlets to minimise the
delay time for hot water delivery. For installations where the distance between the water heater and the outlets is
considerable, a flow and return system or the ‘circulation kit’ Rinnai system can be used to minimise the waiting time
for hot water delivery.
An AC 230V/50Hz, earthed power point must be provided adjacent to the appliance. For outdoor installations this
power point must be weather proof. It must be clear of the gas and water connections to the appliance and also the
flue exhaust and water pressure relief valve. The power cord of the appliance is 1.5 metres long.
All appliances must be installed to ensure access can be gained without hazard or undue difficulty for inspection,
repair, renewal or operational purposes. Sufficient clearances shall allow access to, and removal of, all serviceable
components.
This appliance must not be used as a domestic spa or swimming pool heater.
Both support brackets must be fastened with metal plugs.
The water heater must be easily accessible for maintenance.
Provide for the installation of an appropriate system to collect water from the pressure relief valve and to collect and
drain water under the appliance to prevent material and property damages in case of water leakage.
The flue system must respect the minimum clearance prescriptions and applicable regulations.
Air surrounding the water heater, venting and vent termination is used for combustion and must be free of any
compounds that cause corrosion of internal components. These include corrosive compounds that are found in
aerosol sprays, detergents, bleaches, cleaning solvents, oil based paints/ varnishes, and refrigerants.
Do not install the appliance near combustible objects, chemical products or corrosive agents. If it is necessary for
a water heater to be located in areas which may contain corrosive compounds, Rinnai strongly recommends the
following: install as far away as possible from exhaust vent hoods; install as far away as possible from air inlet vents.
Corrosive fumes may be released through these vents when air is not being brought in through them.
Chemicals that are corrosive in nature should not be stored or used near the water heater or vent termination.
Damage and repair due to corrosive compounds in the air is not covered by warranty.
Coastal installations
Installations located in or near coastal areas may require additional maintenance due to corrosive airborne ocean
salt.