Rinnai REU - 16 FUA - E User manual

Installation and User Manual
REU - 16 FUA - E
“Infinity 16 i”
“Infinity 16 i”
Continuous Flow Water Heater
Important.
Read these instructions carefully before attempting installation or use of
this appliance. All work must be carried out by competent persons.

2

3
Contents………………………………………………………………..…………………3
User Instructions.....................................................................................................4
Features and Benefits………………………………………………..………….5
Important Information…………………………………………...……..………..6
Operation without Remotes……………………………………………….……8
Temperature Controls…………………………………………….……………..9
Caring for the Infinity..................................................................................15
Error Messages…………………………………………………………………16
Restarting the Rinnai Water Heater………………………………………….18
Installation Instructions…………………………………………….………..…………19
UK Installation Instructions…………………………………………………….20
Unpacking Rinnai Water Heater…………………………….………………...21
Operation Principle……………………………………………...……………...22
Main Components………………………………………………..……………..23
Installation Instructions……………………………………………….………...25
Flue Requirements……………………...…….………………………………..30
Temperature Controls…………………………………………………………..34
Testing…………………………………………………………………......…….37
Gas Pressure Setting…………………………………………………….....….38
Dip Switch Setting………............……………………………………………...40
Dimensions…………………………...........................………………………..41
Technical Details..……………………………………............………………...42
Flow Chart…….………………………………………………......………..……43
Wiring Diagram…….……………………………………………………………44
Diagnostic Points…………………………………………………………….....45
Letter of Compliance……………………………………………………....…...46
CE Certificate……………………………..……………………………………..47
Commissioning Checklist…………………...………………………………….48
UK Warranty………………………………….………………………………….49
Specification…………………………………..…………………………………50
Service Contact……………………………….…………………………………51
CONTENTS

4
USERS INSTRUCTIONS
The following instructions are designed for the user of the water heater.
The user may not install or adjust the appliance in any way that requires the removal of
the front of the unit. To remove the front cover of the unit you must be certified compe-
tent to do so. Information for the Installer is given on page 22.
All work done on this appliance must be done by a qualified gas en-
gineer. A qualified gas engineer must carry an up to date CORGI
Registered Gas Installer picture identification card while working
on gas appliances. If you are unsure do not be afraid to ask the en-
gineer to show you the card. If you are still not satisfied call CORGI
on 0870 401 2300 and verify the engineers name with their data-
base. This is for your own safety.
Responsibilities of the USER
The user must abide by all warnings given in this book. The user must only reference
the user section of the book, and may not carry out any procedure listed in the installer
section.
The user must have the unit checked and maintained annually by a gas engineer.
The user must periodically check the water filter on the inlet to the appliance.
The user must not use the appliance in any way that it was not meant to be used. The
user may only use the heater as detailed in the User portion of this manual.
The user must not store or use any flammable vapours or liquids in the vicinity of this or
any other appliance.
The user should familiarise themselves with the water heaters gas service valve and the
main gas valve to the premises.
IF YOU SMELL GAS
Isolate the gas supply and get out of the building.
Do not try to light any appliance.
Do not turn any light or other electrical switch on or off.
Do not use any telephone in the building.
Call your gas engineer from a safe location and follow their
instructions.
If you cannot reach your gas engineer ring the following:
TRANSCO 0800 111 999

5
Congratulations on purchasing the Technologically Advanced, Temperature Controlled,
Rinnai Hot Water System.
x The Rinnai Infinity 16i will NEVER RUN OUT of hot water. As long as electricity,
water, and gas supplies are connected, hot water is available when hot water taps are
open.
x Built into the main micro-processor is the facility to LIMIT THE MAXIMUM
TEMPERATURE of the hot water supplied. The water temperature may be set to
various temperatures. This is particularly useful when the hot water unit is installed
where young children or the infirm may be using the hot water. If required, the
temperature can be changed via the control pad on the front of the unit or with a
localised controller. For further information, please contact Rinnai.
x Rinnai Infinity internal units are powered flue appliances. This makes them
COMPACT, saving both floor and wall space.
x 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 55°C the
burner is shut OFF and only turned ON again when the temperature falls to below the
selected temperature.
x The burner lights automatically when the hot water tap is opened, and extinguishes
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.
x The 16i has a built in controller on the front of the unit for easy control. Two additional
external temperature controllers can be mounted remotely from the heater. This offers
the following additional features:
Localised temperature setting.
Diagnostic message.
Error Codes.
x Temperatures selected at the controllers are retained in the SYSTEM MEMORY
when the controller gives up priority or the system is turned off. Temperatures over
550C will revert to 550C when power and/or priority is regained.
x Operating NOISE LEVEL IS VERY LOW.
x ERROR MESSAGES ARE DISPLAYED on the Temperature Controllers, assisting
with service.
x FROST PROTECTION device built in as standard.
FEATURES AND BENEFITS

6
Excessively hot water is dangerous, especially for young children and the infirm. The
water heater allows you to control the temperature of your hot water to safe levels.
Do stay with children
whenever they are in the bathroom.
Do take them out of the bathroom if
you need to answer the phone or
door.
Do test the temperature of the water
with your elbow before placing your
child in the bath.
Do make sure that the tap is turned
off tightly.
Do consider setting your Rinnai
Infinity or HD50i at a maximum
temperature of 500C.
Do install a child proof tap cover
OR,
Do install a child resistant tap.
Do not leave a toddler in the care of
another small child. The older child
may not have safely set the temperature.
IMPORTANT INFORMATION
Water temperature over 50ºC can cause severe
burns instantly or even death from scalding.
Children, disabled and the elderly are at the
highest risk of being scalded by excessively hot
water.
Always test the temperature of the water before
bathing or showering.
Burns from hot water taps can result in very
severe injuries to young children.
Hot water at 65°C can severely burn a child in less
than half a second. At 50°C it takes five minutes.
Burns can occur when children are exposed
directly to hot water or when they are placed into a
bath which is too hot.
DO
x Consider child—resistant taps
or inexpensive tap covers, both
of which prevent a child’s hand
from turning on the tap.
x Consider reducing the
temperature of the water
supplied to the hot tap to 500C.
This approach can be extremely
valuable because it requires a
one time action for a long term
reduction in risks of scalds.
This type of automatic protection
is important during times when a
parent or carer has been
distracted.
DO
NOT

7
IMPORTANT INFORMATION
Always check water temperature before
use.
Refer to warning about hot water on
page 16 for important safety information.
Hot water may go cold without warning at
very low water flows (less than 3 l/min.)
The Infinity 16i controls the water tem-
perature automatically. For high tempera-
tures it may reduce the flow. The water
from the hot tap may be reduced after
the temperature shown on the remote
control is raised. The water flow may also
vary with the temperature of the incoming
water supply.
Keep flammable materials, trees, shrubs,
chemicals, etc. away from the flue outlet.
Do not touch the flue outlet. Do not insert
objects into the flue outlet.
On cold days steam may be discharged
from the flue outlet. This is normal, do
not be alarmed. It does not indicate a
fault.
OFF
If freezing temperatures
are expected, turn off the
water and gas, and drain
the water heater.
1. Water Off
2. Gas Off
3. Drain Water
If the power is left on the
Automatic Frost Protection
will prevent the unit from
Freezing. Frost protection
is standard on all units.
Drain
Gas
Drain
Water

9
TEMPERATURE CONTROLS
The purpose of a Temperature Controller is to enable the user to have complete control
over the hot water supply. Used correctly, the Infinity will supply hot water at the
temperature selected, even when the water flow is varied, or when more than one tap is
used. Adjustments to the operation of your hot water unit can be made with any of the
Temperature Controllers. Each Temperature Controller can be individually programmed.
Up to three Temperature Controllers can be fitted with the Infinity 16i. One of these
controllers comes as standard mounted on the water heater. Additional Temperature
Controllers are an optional extra.
The controllers have temperature selection, water flow volume, and water supply
temperature functions.
Various water temperatures (°C) can be selected as follows:
35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 55, 600C
750C can be set on the dip switches.
When the remote is turned on the temperature will default to 400C.
While the hot water is running, the maximum selectable temperature will be 48°C. This
provides additional safety for the consumer.
Suggested temperatures are:
Kitchen 50°C - 60°C; Bathroom 39°C - 43°C
These temperatures are suggested starting points for selection. You may find higher or
lower temperatures are more comfortable. Maintaining lower temperatures helps to save
energy. To obtain water temperatures lower than 35°C simply add cold water.
Up to three controllers can be used for one Infinity 16i. When multiple temperature
controllers are used the only remote that can change the temperature is the one with
priority. This is shown by the lit priority indicator. When the Kitchen Controller has
priority the other remote’s priority indicator will go out. When the Bathroom Controller
has priority the other remote’s priority indicator will flash. A different remote can only
take priority of the system by pushing the priority button when the priority lamp is out.
This means that while the Bathroom Controller has priority no one else can alter the
temperature.
To take priority with the Kitchen Controller from the Bathroom Controller the priority
button on Bathroom Controller must be pressed to give priority away.
The temperature selected by the controller with priority will be available to all outlets.

10
Remote temperature controllers are a feature that provides control over the water
temperature. The Rinnai Infinity 16i water heater can be operated with 1, 2, or 3
temperature controllers. The controller MC-45-SR-EU comes as standard with this
water heater installed into the front panel.
NOTE:
Each time a button is pressed, a BEEP will sound.
The BEEP sound can be muted by depressing the Temperature Controller Up and Down
buttons simultaneously for more than 3 seconds until the controller beeps.
This can be done for each Temperature Controller.
To return to original settings, repeat this step.
TEMPERATURE CONTROLS - OPERATING
Digital Monitor
Indicates the tem-
perature selected.
Error message
flashes in the event
of a fault.
Priority Button
Used to transfer con-
trol between tem-
perature controllers.
The controller with
priority has command
of the hot water de-
livery temperature.
Priority Indicator
Indicates that the
controller has com-
mand of the system
(glowing,) or that the
system is free to take
command of (off.)
ON / OFF Button
Used to switch hot
water system on
and off.
Temperature
Buttons
Used to select hot
water delivery
temperature.

11
TEMPERATURE CONTROLS - OPERATING
Using the Temperature Controllers.
Press the ON/OFF button on a temperature controller.
The system will become active, the temperature will
default to 400C and the controller that turned the
system on will have priority. The temperature setting
on the controller will light up.
Adjusting Temperature
Simply press the Hot Water Temperature Up or Down
arrow button until the desired temperature is displayed
on the digital display.
To operate the heater, simply turn any hot water tap on. This will automatically light the
burner providing hot water. The red IN USE indicator will glow
amber on the temperature controller.
Caution: Always check water temperature before use.
Note: With the hot water tap open a temperature of 500C or higher can not be
selected. For safety reasons temperature ‘priority’ cannot be transferred
between controllers when a hot water tap is open.
COOLERHOTTER

12
Using 2 or more Temperature Controllers.
Switching the system ON.
.
The hot water system and all controllers can be
switched ON and OFF from any controller by pressing
the ON/OFF button as shown. When the system is
turned ON the water temperature display will be lit.
During normal operation the system is left ON. Do not
push the ON/OFF button when water is running.
Ensure the system is switched On by verifying the
temperature display is lit. Ensure the controller has
priority by verifying the ON LED indicator is lit. If it is
not then press the Priority button once. This gives
the local controller priority of temperature over the
system.
Select the desired temperature using the TEMP.
SELECTOR buttons. The selected temperature will be
displayed on all controller displays. This is the water
temperature which will be supplied from the heater.
TEMPERATURE CONTROLS - OPERATING
Open the hot water tap. The appliance
will be activated and the IN USE indica-
tor will be lit.
When temperatures 500C and above are
chosen the High Temp lamp will be lit.
COOLERHOTTER
Bathroom temperatures should be no more than 500C.
Using hot water.

14
Do not push the ON/OFF button on the
Master controller after transferring priority
of temperature selection to a Secondary
controller as the system will shut down.
Do Not Turn OFF
the Master
Controller
Temperature priority can not be switched
to another controller when the water is
flowing through the water heater.
Depending on the weather conditions
and the length of the pipe between the
heater and the tap in use, there may be a
variation between the temperature dis-
played at the controller and the tempera-
ture at the tap.
Do not clean the control with
solvents or detergents. Use only a soft
damp cloth.
If a temperature 500C or higher has been selected on a controller and priority of tem-
perature selection is transferred to another controller, then back again, the temperature
on the controller will automatically drop to 50(or 42)ºC. If the set point is 50(or 42)0C or
less it will not alter. This is a safety feature.
First Another First
Controller Controller Controller
TEMPERATURE CONTROLS - INFORMATION
480C
Controller 1
in use
Controller 2
cannot take
priority
400C

15
CARING FOR THE INFINITY
Maintenance
Even if there does not seem to be a problem with the water heater it is required in the
UK that all gas appliances are serviced every year by a certified gas engineer. This is to
ensure continued safety of the gas appliance. If you need a recommended service
engineer contact Rinnai or your supplier.
Care
When the appliance casing, operation panel, and remote controls surfaces become dirty
gently wipe them clean with a soft, damp cloth. Do not use detergents on these parts.

16
ERROR MESSAGES
Rinnai water heaters have the ability to check their own operation continuously. If a fault
occurs, an error code will flash on the Digital Display if you have temperature controllers
installed. 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. Some of these remedies can not be checked by the user because they require
the front to be taken off of the unit. They are included so that you can give the
information to the gas engineer.
* In all cases, you may be able to clear the Error code by turning the hot water tap OFF, then ON
again. If this does not clear the error, try pushing the On/Off button OFF then ON again. If the Error
Code still remains contact Rinnai or your nearest service agent for advice.
** Faults caused by insufficient gas/water supply or gas/water quality and installation errors are not
covered by the manufacturer’s warranty.
Regular maintenance should be performed by a competent person in accordance
with the local regulations at least once annually.
Code
Displayed
Fault Remedy
-Noticeable reduction in water
flow
Inlet water filter needs to be cleaned.
10 Not enough combustion air Check for physical blockages around
air intake or exhaust. Check combus-
tion fan.
11 No Ignition / Gas supply Check gas valves, gas supply and
ignition unit.
12 Flame failure / Earth Leakage Check gas valves and gas supply.
Check flame rod.
Check earth wire lead.
Check remote control.
14 High flame safety device Check overheat circuit
16 Over temperature warning Modulating control valve problem or
water flow control valve problem
32 Outgoing water temperature
sensor faulty
Check Hot Water Thermistor and wire
34 Combustion Air temperature
sensor faulty
Check Air Intake Thermistor and wire
61 Combustion fan failure Check Combustion Fan
71 Micro-processor failure or Sole-
noid circuit failure
Check solenoids and pcb.
72 Flame rod circuit error Check flame rod and pcb.
52 Gas modulating valve faulty Check gas modulating valve and pcb.

17
ERROR MESSAGES
Troubleshooting without 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.
NOTE: Faults caused by insufficient gas/water supply or gas/water quality and
installation errors are not covered by the manufacturer’s warranty.
Installations with circulation pumps
With temperature controller fitted.
If you have an installation using a secondary circulation pump this must be
switched off so that there is no flow through the heater when starting or after a
power failure. If the pump is running the unit will not operate (no display on the
controller). Isolate pump then start heater before restarting pump. This is a safety
feature.
The pump should also be fitted with a thermostat to prevent the return temperature
reaching the heater set point temperature.
Without temperature controller fitted.
The heater should automatically reset and provide water at the temperature set by
the internal limit switches.
Fault Remedy
Heater does not attempt
to start at all.
Check the power is on at the heater.
Check the cold water valve supplying the heater is open.
Heater starts then shuts
down immediately.
Check the power is on.
Check the gas valve at the heater and at the gas meter is fully open.
Open the hot water tap fully.
Heater starts then the
water goes cold.
Check the power is on.
Open your hot water tap further or try another hot outlet.

18
RESTARTING THE RINNAI WATER HEATER
Following a power cut the heaters should be restarted in this manner.
Standard system.
Single or multiple water heaters without remote controllers.
The heaters will automatically reset without any user involvement.
Single or multiple water heaters with remote controllers.
The heaters will be required to be switched on using the ON/OFF button on a remote
controller. Ensure that all taps/water outlets are closed and no water is flowing through
heaters.
Hot water system incorporating secondary recirculation pump.
Single or multiple water heaters without remote controllers.
The heater(s) will automatically reset without any user involvement.
Single or multiple water heater(s) with remote controller(s).
To reset the heaters follow the steps.
1. Turn off all hot water taps.
2. Turn off supply to secondary circulating pump or alternatively, if heater and pump
are fed from the same electrical supply, isolate pump flow.
3. Turn on heater at remote control.
4. Select required temperature.
5. Switch on supply to secondary circulating pump or open valve on pump flow.
The heater will now be ready to supply water at the set temperature.
If following the above procedure does not reset the heater switch it on and off at its main
supply, and then go through these steps again. If heater is still not working call your local
service agent or Rinnai for assistance.

19
STOP
To go beyond this point in the manual you must be a
registered gas engineer.
Do not attempt to install this appliance if you are not
qualified.
If the information in this manual is not followed exactly a
fire or explosion could result.
This manual must be read in its entirety before installing
the appliance.
If you are unsure of any point contact Rinnai or your
supplier.
INSTALLATION INSTRUCTIONS

20
IMPORTANT INFORMATION
This appliance may only be installed by someone certified competent to do so.
At the time of printing the only people deemed competent to install this
appliance are those that are CORGI registered for this type of appliance in this
type of location who have a current ACS certificate.
1. Gas safety (Installation & Use) regulations 1998 are the ‘Rules in force’. In your
own interest and that of safety, it is law that all gas appliances are installed by
competent persons in accordance with the above regulations. Failure to install
appliances correctly could lead to prosecution. Other persons should NOT attempt to
install this equipment.
2. Building Regulations G3 require installers of unvented systems to be competent to
do so. Competence can be shown by holding a current certificate in Unvented
Domestic Hot Water Systems. If the Infinity is installed in a flow and return, or tank
system, or any other closed system then the system is unvented.
3. Installation must be carried out in accordance with the current issue of the following:
Building Regulations issued by the Department of the Environment
Building Standards (Scotland) Regulations.
I.E.E. Wiring regulations for electrical installations.
Gas safety (Installation and Use) Regulations current issue.
BS 5546
BS 5440
BS 6891
BS 5482
BS 6700
BS 6644
Institute of Gas Engineers Publications
Local byelaws
Water regulations
Health and safety at work etc. Act 1974
IGE/UP/10 Part1 Edition 2.
Building Regulation J
Such other specifications and regulations that may supersede or complement the
above documents.
Please be sure that you are fully aware of your obligations and responsibilities
under these regulations.
UK INSTALLATION INSTRUCTIONS