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

2
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.

3
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.

4
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.

6
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

8
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.

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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*, 60*, 65*, 75*, 85*
Sub (MC or BC) 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50
* Temperature may not be available on all installations. Some Rinnai gas 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.
** Temperature limiting devices (where fitted) may further control what maximum delivery temperature is available to outlets.
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.

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1.3.5 UNIVERSAL WATER CONTROLLER (MC-601) OPERATION
DIGITAL MONITOR
TEMPERATURE CONTROL BUTTONS
WATER HEATER ON INDICATOR
ON/OFF BUTTON
Indicates if this water controller is in control of water
delivery temperature.
CONTROLLE R PRIORITY INDICATOR
PRIORITY TRANSFER BU TTON
WATER HEATER 'IN USE' INDICATOR
Used to select water temperature.
Indicates that the hot water heater is on.
Indicates the temperature selected.
Error messages flash in event of a fault.
Indicates that a water heater is delivering hot water.
Used to switch the water heater on and off.
Used to transfer control priority between water
controllers. The water controller with priority has
command of the hot water delivery temperature.
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!

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Lock 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

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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.

15
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
Thermistor Fault Service Call.
34
Combustion Air
Temperature Sensor
Fault
Service Call.
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 Scale build-up inside
the heat exchanger Service Call.

16
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.
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.

17
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.

18
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 gas appliances 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
Outdoor models
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.
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 220-240V/50-60Hz, 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.
Altitude instructions
The appliance are suitable for installations higher than 1000 metres above sea level such as alpine areas, refer to on page 19 for
further information.

19
Altitude Setting REU-VCM ONLY
IMPORTANT
REU-VCM models are suitable for installation locations higher than 1000 metres above sea level such as
alpine areas. To ensure proper appliance operation the installer MUST select one of the two available
altitude ranges for the appliance these are:
'DEFAULT' suitable for installation locations that are from 0 to 900 metres above sea
level.
'HIGH' suitable for installation locations that are from 901 to 1800 metres above sea
level, as would be typical of installations located in alpine areas.
Refer to "Commissioning Instructions" located inside the appliance front cover for
details.
2.2 UNPACKING THE WATER HEATER
Prior to use make sure that the water heater is set up for the correct type of gas and that the appliance is intact.
If the appliance is clearly damaged or you have doubts do not install the water heater and contact your supplier or Rinnai immediately
for further information.
2.3 DIMENSIONS
REU-VCM2837FFC-GEN
A CONNECTION
GAS
COLD
HOT
CABLE
36
46
36
26
R3/4 (20mm)
R3/4 (20mm)
R3/4 (20mm)
Ø137
Ø128.2
157
27
110
62.550
89
81
60
89
578 634
2-5.5X16
130
80
35
28
22
24.5 20.8
235.5
95
64.5
68
A
583
357
OFF ON
DipSW1
6
OFF ON
DipSW2
6
Default
OFF ON
DipSW1
6
OFF ON
DipSW2
6
High

20
REU-VCM2837WC-GEN
A CONNECTION
GAS
COLD
HOT
CABLE
36
46
36
26
R3/4 (20mm)
R3/4 (20mm)
R3/4 (20mm)
35
28
25.5
21
18
80
130
576.4
632.4
157
27
110
62.550
75
67
46
89
357
583
A
235.5
829.5
646.4