Rinnai REU-VCM2837FFC-GEN Specification sheet

Models:
REU-VCM2837FFC-GEN
REU-VCM2837WC-GEN
Continuous flow and temperature control
instantaneous gas water heater
Operation and installation manual

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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.
Read these operation and installation manual carefully before using the appliance and retain them for future reference
This appliance shall only be installed in an outside location
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.................................................................................................................................................................................................1 0
1.3.1 MAXIMUM DELIVERY TEMPERATURES........................................................................................................................................................................1 0
1.3.2 OPERATION WITHOUT WATER CONTROLLERS.................................................................................................................................................1 0
1.3.3 RINNAI WATER CONTROLLERS...........................................................................................................................................................................................1 0
1.3.4 WATER CONTROLLER COMBINATIONS & CONFIGURATIONS.............................................................................................................1 1
1.3.5 UNIVERSAL WATER CONTROLLER (MC-601) OPERATION....................................................................................................................... 1 2
1.4 TROUBLE SHOOTING.................................................................................................................................................................................................................................... 1 4
1.4.1 ERROR CODES...................................................................................................................................................................................................................................... 1 4
1.4.2 TROUBLESHOOTING WITHOUT WATER CONTROLLERS......................................................................................................................... 1 6
1.4.3 SERVICE....................................................................................................................................................................................................................................................... 1 6
2. INSTALLER’S INSTRUCTIONS ............................................................................................................................................... 1 7
2.1 INSTALLATION WARNINGS ..................................................................................................................................................................................................................... 1 8
2.1.1 APPLIANCE LOCATION ................................................................................................................................................................................................................ 1 8
2.2 UNPACKING THE WATER HEATER................................................................................................................................................................................................... 1 9
2.3 DIMENSION............................................................................................................................................................................................................................................................. 1 9
2.4 INSTALLATION..................................................................................................................................................................................................................................................... 2 1
2.4.1 SELECTING A LOCATION...........................................................................................................................................................................................................2 1
2.4.2 WATER CONNECTION................................................................................................................................................................................................................... 24
2.4.3 GAS CONNECTION .......................................................................................................................................................................................................................... 24
2.4.4 ELECTRICAL CONNECTION....................................................................................................................................................................................................25
2.5 WATER CONTROL ...........................................................................................................................................................................................................................................26
2.5.1 GENERAL INFORMATION ..........................................................................................................................................................................................................26
2.5.2 UNIVERSAL WATER CONTROLLER (MC-601) INSTALLATION............................................................................................................... 28
2.6 COMMISSIONING.............................................................................................................................................................................................................................................29
2.7 TECHNICAL DATA.............................................................................................................................................................................................................................................30

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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.
Max. 43°C
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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49°C
50°C 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.
OFF!
OFF!
ON!
ON! COLD COLD
HOT
HOT
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.