Rinnai REU- A1620WD-IND Specification sheet

Continuous flow and temperature control
instantaneous gas water heater
Operation and installation manual
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 .
REU- – Infinity 16 external - 16e
REU- – Infinity 26 external - 26e
A1620WD-IND
A2626WD-IND

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INTRODUCTION
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 .................................................................................................................................. 5
1.1 FEATURES AND BENEFITS ...................................................................................................................... 6
1.2 IMPORTANT SAFETY INFORMATION....................................................................................................... 7
1.2.1 OPERATIONAL SAFETY INFORMATION ......................................................................................... 8
1.3 WATER TEMPERATURE CONTROL ....................................................................................................... 10
1.3.1 MAXIMUM DELIVERY TEMPERATURES....................................................................................... 10
1.3.2 OPERATION WITHOUT WATER CONTROLLERS ......................................................................... 10
1.3.3 RINNAI WATER CONTROLLERS ................................................................................................... 10
1.3.4 WATER CONTROLLER COMBINATIONS & CONFIGURATIONS.................................................. 11
1.3.5 UNIVERSAL WATER CONTROLLER (MC-601) OPERATION........................................................ 12
1.4 TROUBLE SHOOTING ............................................................................................................................. 14
1.4.1 ERROR CODES .............................................................................................................................. 14
1.4.2 TROUBLESHOOTING WITHOUT WATER CONTROLLERS.......................................................... 16
1.4.3 SERVICE ......................................................................................................................................... 16
2. INSTALLER’S INSTRUCTIONS ...................................................................................................................... 17
2.1 INSTALLATION WARNINGS..................................................................................................................... 18
2.1.1 APPLIANCE LOCATION .................................................................................................................. 18
2.2 UNPACKING THE WATER HEATER ........................................................................................................ 19
2.3 DIMENSION.............................................................................................................................................. 19
2.4 INSTALLATION ......................................................................................................................................... 20
2.4.1 SELECTING A LOCATION............................................................................................................... 20
2.4.2 WATER CONNECTION ................................................................................................................... 22
2.4.3 GAS CONNECTION ........................................................................................................................ 22
2.4.4 ELECTRICAL CONNECTION .......................................................................................................... 23
2.4.5 CONTROL BOARD DIPSWITCH SETTING .................................................................................... 23
2.5 WATER CONTROL ................................................................................................................................... 24
2.5.1 GENERAL INFORMATION .............................................................................................................. 24
2.5.2 UNIVERSAL WATER CONTROLLER (MC-601) INSTALLATION ................................................... 26
2.6 COMMISSIONING .................................................................................................................................... 27
2.7 TECHNICAL DATA .................................................................................................................................... 28
3. BAHASA INDONESIA ..................................................................................................................................... 29

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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.

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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
3-prong plug 2-prong plug
※The illustration above is an example
of grounding.
Ground
Ground
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!

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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 60°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.