Rinnai Infinity 20e User manual

Installation and User Manual
Infinity 20e
Infinity 20e
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
RINNAI UK WARRANTY
As the purchaser of this high quality Rinnai Water Heater you are provided with the
following conditional guarantee.
Definition of Standard Use.
The warranty period allocated under Standard Use is based on Domestic and Light
Commercial hot water usage. Rinnai Standard Use warranty periods apply only where
Rinnai water heaters are installed in domestic and light commercial situations at
operating temperatures below 650C and do not include installations incorporating
storage cylinders or building flow and return systems.
The warranty shall apply to any Rinnai water heater from the Infinity range used in this
way.
Definition of Commercial Use.
The warranty period allocated under Commercial Use are for Infinity water heaters
installed at premises such as commercial and industrial buildings, cafes, caravan parks,
and sporting complexes. Commercial Use warranty applies to:
Water heaters supplying a central shower block
Water heaters supplying kitchens used for the bulk preparation of food.
Water heaters set to 650C or higher.
Water heaters used in commercial or industrial processes.
Any application that uses Rinnai water heaters in conjunction with storage tanks
Any application that uses Rinnai water heaters in conjunction with a flow / return system.
Water heaters installed as components of centralised bulk hot water systems.
Rinnai Infinity units used in Commercial Situations are only subject to a 1 year warranty
across the board. Commercial situations should be supplied by the Rinnai HD range.
No Rinnai warranty will cover faults arising from improper installation or gas supply,
water contaminants beyond defined limits, environmental factors, plumbing fittings, or
other outside influences of which Rinnai is not responsible. Service calls for these
issues will be chargeable.
Heat Exchanger All Other Parts
Parts Labour Parts Labour
Standard Use 3 Years 1 Year 3 Years 1 Year
20e
Commercial Use 1 Year 1 Year 1 Year 1 Year
20e
Description pH
Total Dissolved
Solids (TDS)
Total Hard-
ness Chlorides Magnesium Calcium Sodium Iron
Maximum Recom-
mended Levels 6.5 - 9.0 600 mg/litre 200 mg/litre 300 mg/litre 10 mg/litre 20 mg/litre 150 mg/litre 1 mg/litre

3
CONTENTS
Rinnai UK Warranty..……………………..
Unpacking Rinnai Water Heater…………
Installation Instructions……………………
Flue Requirements………………………...
Dimensions…………………………………
Technical Details..…………………………
Features and Benefits…………………….
Important Information……………………..
Operation without Remotes………………
Temperature Controls……………………..
Testing………………………………………
Gas Pressure Setting……………………..
Dip Switch Setting…………………………
Error Messages……………………………
Restarting the Rinnai Water Heater……..
Wiring Diagram…………………………….
Diagnostic Points…………………………..
Specification………………………………..
Service Contact……………………………
Commissioning Check List………………..
…………………………………………………2
…………………………………….…………..4
…………………………………………………5
…………………………………………………8
…………………………………………………9
……………………………………………….10
……………………………………………….11
……………………………………………….12
……………………………………………….14
……………………………………………….15
……………………………………………….25
……………………………………………….26
……………………………………………….28
……………………………………………….30
……………………………………………….32
……………………………………………….33
……………………………………………….34
……………………………………………….35
………………………………………………36
………………………………………………36

4
UNPACKING RINNAI WATER HEATER
• After unpacking the appliance check for damage, if the heater is damaged contact
your supplier immediately. Do not install a damaged appliance before checking
with your supplier.
• One remote control and heater accessories pack are inside the carton.
• Check that the appliance supplied is the correct gas type for the installation. Refer
to the data plate located on the left-hand side of the appliance.
• Remove the heater and the accessories from the carton, and check that all the
parts are included . The remote control cable is provided with spade connectors.
Quantity Diagram Description
1 Temperature con-
troller MC-91-1A
1 Cable clamp
1 Cable Clamp
5 Spade connectors
1 Control cable 20
metres
1 Clamp screw
Unit Mounting Fasteners
5 Screw
5 Screw
Remote Control Parts
Quantity Diagram Description

5
IMPORTANT INFORMATION
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. Unpack the appliance and check it carefully. If it appears to have any defects or
damage DO NOT INSTALL, contact your supplier.
3. This appliance is for normal hot water supply only and should not be used as pool or
spa water heater.
4. The heater must be installed in the vertical position with the gas and water
connections on the underside pointing vertically downward.
5. Installation must be carried out in accordance with the current issue of the following:
Building regulations issued by the Department of the Environment and
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
Local byelaws
Water regulations
Health and safety at work etc. Act 1974
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.
INSTALLATION INSTRUCTIONS

6
General Installation Information.
External Installations.
The Rinnai Infinity 20e is for external mounting only.
The unit is classed as a Category A3 flueless appliance as described by CEN CR1749.
Although BS 5440 does not relate directly to heaters in this category the rules must be
followed when positioning the appliance, especially with regard to other appliances,
openings, and boundaries. Figure C.1 from BS5440-1:2000 is provided for your
guidance.
The appliance must be mounted on a vertical wall or structure with the water and the gas
connections on the underside pointing towards the ground.
THIS APPLIANCE MUST NOT BE USED AS A DOMESTIC SPA OR SWIMMING
POOL HEATER.
Appliance Location.
The appliance should be placed as close as practicable to the most frequently used hot
water outlet point or points to minimise the delay time for hot water delivery. For
installations where the distance between the unit and hot water outlet points is
considerable, the appliance can also be fitted in a 'flow and return system' which
minimises the waiting time for hot water delivery. Alternatively, multiple appliances can
be strategically placed to service outlet points with minimal delay time. Contact Rinnai
for further information.
Location of the appliance flue terminal must be in accordance with the clearances shown
on page 8. Ensure that the flue terminal and hot water outlet connection cannot be
touched by children. The appliance must be clear of obstructions and shrubbery.
The wall or structure on which it is mounted must be capable of supporting the weight of
the appliance (16 kg) and associated pipework. Ensure that suitable screws or bolts are
used to secure the water heater to the wall. Bracket and fixing hole locations are shown
on page 9. The top bracket has a keyhole slot so that the appliance can be hung on one
screw, and then the other fixings can be added to secure the unit.
The appliance must be in an accessible location. Sufficient clearances shall allow
access to, and removal of, all serviceable components. The appliance should not be
mounted higher than 3.5 metres from the ground or floor level unless the customer can
arrange permanent and safe access or can arrange another means of access, for
example, by means of scissor or boom lifts.
Multiple heater installations can be installed with the heaters manifolded together.
The heater draws combustion air through the casing for the external model.
Heater guards and pipe cover boxes for security and safety are available from Rinnai.
INSTALLATION INSTRUCTIONS - POSITIONING

7
INSTALLATION INSTRUCTIONS - CONNECTIONS
Water Supply.
Where the water supply pressure exceeds 10 bar, an approved pressure reducing
device is required at the inlet of the appliance. To achieve the rated flow a minimum
water supply pressure of 1.3 bar is required at the appliance inlet. The unit will operate
at lower supply pressures but the rated flow will not be achieved. Contact Rinnai for
'gravity fed' or 'low pressure' hot water installations.
Water pipe sizing and layout should be designed correctly to ensure the given water
flows from the Rinnai Infinity are available. All hot water pipework should be insulated to
optimise maximum performance and energy efficiency.
Water Connection.
Connect the hot and cold water supply pipes. An approved isolation valve and strainer
MUST be installed in the cold water inlet pipe. An approved isolation valve should be
installed in the hot water outlet pipe. There must be a union or release fitting on the
heater side of the isolation valves. A non return valve is not required unless dictated by
local regulations. A pressure relief valve should be installed in the pipework to
discharge safely into a suitable drain if used in a flow and return configuration.
Position of the cold water inlet, hot water outlet and gas connection is shown on page 9.
Water connections are 1/2 inch BSP, gas is 3/4 inch BSP. This is NOT an indication of
the pipe sizes required.
If the heater is in a hard water area a suitable water conditioning device should be in-
stalled to prevent the build up of limescale within the heat exchanger. Heat exchangers
damaged by scaling are not covered by the manufacturers guarantee. Guidelines are
given below. If the local water exceeds these values the heater must be protected.
Gas Connection
Check pipe sizing required for the heater input. The heat input for the Infinity 20e is 44.4
kW. Refer to BS6891 (Natural Gas) and BS5482 (Propane) for guidance on correct pipe
sizing calculation.
Check that the size of the gas meter and pipework will be sufficient for all appliances on
the main. Sufficient gas must be available at the appliance if correct operation is to be
expected. An approved gas isolation valve must be fitted at the gas inlet. A union or
release fitting should be installed after the isolation valve.
Electrical Connection.
The appliance must be earthed. The appliance is suitable for 230VAC – 50hz mains
only and all wiring must be carried out to the I.E.E regulations latest edition. The heater
electrical supply must be provided with a fused (3A) local isolator with a contact
separation of 3mm minimum on all poles for servicing. Observe polarity and ensure that
wiring is correctly restrained.
Description pH
Total Dissolved
Solids (TDS) Total Hardness Chlorides Magnesium Calcium Sodium Iron
Maximum Recommended
Levels 6.5 - 9.0 600 mg/litre 200 mg/litre 300 mg/litre 10 mg/litre 20 mg/litre 150 mg/litre 1 mg/litre

8
Dimension Terminal Position Distance
A Directly below an opening, air brick, opening windows, etc. 300mm
B Above an opening, air brick , opening window, etc. 300mm
C Horizontally to an opening, air brick , opening window, etc. 300mm
D Below gutters, soil pipes or drain pipes. 75mm
E Below eaves. 200mm
F Below balconies or car port roof. 200mm
G From a vertical drain pipe or soil pipe. 150mm
H From an internal or external corner. 200mm
I Above ground, roof or balcony level. 300mm
J From a surface facing the terminal. 600mm
K From a terminal facing a terminal 1200mm
L From an opening in a car port. ( e.g. door, window) into a dwell-
ing 1200mm
M Vertically from a terminal on the same wall. 1500mm
N Horizontally from a terminal on the same wall. 300mm
O From the wall on which the terminal is mounted N/A
P From a vertical structure on the roof. N/A
Q Above an intersection with roof. N/A
FLUE REQUIREMENTS - POSITIONING

9
DIMENSIONS

10
TECHNICAL DETAILS
* Factory Setting
**Minimum operation flow based on temperature setpoint and inlet conditions.
Infinity Model Infinity 20e Units
Installation External
Nat Gas Press Low 1.8 mbar
Nat Gas Press High 9.2 mbar
LPG Press Low 1.9 mbar
LPG Press High 8.4 mbar
Height 530 mm
Width 350 mm
Depth 170 mm
Weight 16 kg
Flue System Forced Exhaust
Temp. Range Controllers 37 - 75 deg C
Temp. Range without
Controllers
37,40,43,50,
55*,65,75 deg C
Ignition Direct Electronic
Ignition
Gas Consumption Low
Nat Gas 5.9 kW
LPG 5.6 kW
Gas consumption High
Nat Gas 44.4 kW
LPG 44.4 kW
Max Flow raised 33C 15.4 L/min
Min Operation Flow 2.4** L/min
Water Pressure Nom. 1.3 - 10 bar
Power Supply
Electric Consumption 74 Watts
230 V / 50 Hz

11
Congratulations on purchasing the Technologically Advanced, Temperature Controlled,
Rinnai Hot Water System.
• The Rinnai Infinity 20e NEVER RUNS OUT of hot water. As long as electricity,
water, and gas supplies are connected, hot water is available when 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 maximum temperatures. This is particularly useful when the hot water unit is
installed where young children or the infirm may be using the hot water. The Infinity
20e is delivered with a preset temperature of 550C. If required, the temperature limits
can be changed by an authorised person. For further information, please contact
Rinnai.
• The Rinnai Infinity external unit is a powered flue appliance. This makes it
COMPACT, saving both floor and wall space.
• 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 the burner is shut OFF and only turned ON again
when the temperature falls to below the selected temperature.
• The burner lights automatically when the hot water tap is opened, and distinguishes
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.
• Up to three temperature controllers can be mounted remotely from the heater. This
offers the following additional features:
Localised temperature setting.
Diagnostic message.
• ‘Deluxe’ Temperature Controllers are an optional extra. These provide functions
including Bath Fill, Voice Prompt, and Clock Setting.
• Temperatures selected at the controllers are retained in the SYSTEM MEMORY.
• Operating NOISE LEVEL IS VERY LOW.
• ERROR MESSAGES ARE DISPLAYED on the Temperature Controllers, assisting
with service.
• FROST PROTECTION device built in as standard.
FEATURES AND BENEFITS

12
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 16e 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
• Consider child—resistant taps
or inexpensive tap covers,
both of which prevent a child’s
hand from turning on the tap.
• 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

13
IMPORTANT INFORMATION
Always check water temperature before
use.
Refer to warning about hot water on
page 12 for important safety information.
Hot water may go out without warning at
low water flows.
The Infinity 20e controls the water
temperature automatically. For high
temperatures 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 heater.
Do not touch the unit cover or 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 the external
units.

14
Rinnai Infinity products have no pilot light and when installed without Temperature
Controllers, the appliance will operate automatically as soon as a hot water tap is
opened.
The burner ignites with electronic ignition and the flame extinguishes as soon as water
flowing through the appliance stops.
Turn On by opening the hot water tap
Rinnai Infinity water heaters without controllers are factory pre-set to a temperature limit
of 55°C. Other limits, lower or higher, are available on request for the Infinity range.
Temperature controllers are available that allow precise digital temperature control.
Higher temperatures may be necessary for circulation loop systems.
Controllers can be easily added at any time after installation.OTE
OPERATION WITHOUT REMOTES

15
TEMPERATURE CONTROLS - GENERAL
When deciding on the best position for the temperature controls, the following points
should be taken into account.
• Fit the controls out of reach of children (suggested height from the floor 1.5m.)
• Avoid positions where the controllers will become hot. Do not fit them near stoves or
ovens, or above radiators or heaters.
• If possible, avoid exposure to direct sunlight or positions where bright lights will make
the digital display difficult to read.
• Position away from areas where the controller will be prone to splashing by cooking
products such as oils and fats.
• The temperature controllers are water resistant, however they should be positioned
away from areas where direct or persistent splashing could occur.
• Refer to the I.E.E electrical wiring regulations current edition for location requirements
in shower and bath areas.
• The cables to the temperature controller carry only 12VDC (extra low voltage.)
• When using more than one temperature controller the signal cable should be run in
parallel. That is, from controller to controller to heater, or from each controller to the
heater. Do not wire the controllers in series.
The installation in every application will vary, therefore the temperature controller cable
has been provided so that you may cut the length accordingly and fit the spade
connectors, ensuring a good connection.
Cables are simply ‘piggy-backed’ at the water heater or at the primary temperature
controller. Polarity is not important when connecting the cables, either colour wire can
be connected to either terminal at both the heater or primary temperature controller. If
more cable is needed any cable with similar specification to the cable supplied with the
controller can be used. Maximum length is 50 metres.

16
TEMPERATURE CONTROLS - INSTALLATION
Universal Temperature Controller
MC-91-1A
1. Determine the most suitable position for the
temperature controller.
2. Drill 3 holes in the wall as shown in fig. 1, one
for the cable and two for the securing screws.
Ensure holes are drilled deep enough. Fit wall
plugs if needed. (ensure controller is level.)
3. Run the cable provided through the hole in the
wall ensuring that the end fitted with the
connector is nearest the controller. (fig. 2.)
4. Remove the face plate from the controller using
a flat screwdriver. Take care not to damage the
cover (fig. 3.)
5. Connect the cable to the temperature controller.
6. Fix the controller to the wall and fasten with the
phillips head screws supplied as shown in (fig.
4.)
7. Remove the protective plastic film from the
controller face as shown in fig. 4.
8. Replace the face plate.
NOTE

17
TEMPERATURE CONTROLS - INSTALLATION
Connecting One or Two Controllers
1. Isolate the power supply.
2. Remove the front cover from the Appliance (4
screws) fig. 1.
3. Thread the cable through the cable access hole
at the base of the appliance.
4. Connect the spade connectors to the terminals
marked "Remote Control" on the printed circuit
board (fig.2). Polarity is not important. Either
wire colour can be connected to either terminal.
5. Replace cover of the Appliance. Ensure that the
special earth screw is placed at the bottom right
hand corner for earthing purposes.
Connecting Three Controllers
1. Isolate the power supply.
2. Remove the front cover from the Appliance (4
screws) fig.1.
3. Thread the cables through the cable access
hole at the base of the appliance.
4. Cut the spade connectors from two controller
cables (4 connectors should be cut off) and
discard. Connect the wires and terminate into
two new spade connectors as shown in fig. 3.
5. Thread the 3 cables through the cable access
hole at the base of the appliance. Connect the
4 spade connectors to the terminals marked
“Remote Control" on the printed circuit board
(fig.2). Polarity is not important. Either wire
colour can be connected to either terminal.
6. Replace cover of the Appliance. Ensure that the
special earth screw is placed at the bottom right
hand corner for earthing purposes.

18
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 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. 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 Universal and Deluxe Temperature Controllers can be fitted with the Infinity
20e. Universal Controllers allow temperature selection only and come as standard with
the water heaters. Deluxe Temperature Controllers are an optional extra. These
controllers have temperature selection, bath fill, voice recognition, and time clock
functions. When more than one Universal Controller is used one may be set as the
Master Controller to allow higher temperatures.
Various water temperatures (°C) can be selected as follows:
Universal Controller:
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 500C
Master Universal Controller:
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50, 55, 60, 65°C
Deluxe Bathroom Controller:
Hot Water Delivery: 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50°C
Bath fill Delivery: 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48°C
Deluxe Kitchen Controller:
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50, 55, 60, 65°C
If a temperature 43°C or higher is selected on any controller and this temperature is then
decreased to below 43°C and increased again whilst the water is running, the maximum
selectable temperature will become 43°C. This provides additional safety for the
consumer.
Suggested temperatures are:
Kitchen 50°C - 65°C*; Shower 39°C - 43°C; Bath fill 39°C - 45°C
* This temperature may not be available on all installations.
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 37°C simply add cold water.
Up to three controllers can be used for one Infinity 20e. 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.

19
Remote temperature controllers are a feature that provides control over the water
temperature. Rinnai Infinity water heaters can be operated with 1, 2, 3 or no temperature
controllers. The Universal controller MC-91-1A comes as standard with all Infinity water
heaters.
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.
This can be done for each Temperature Controller.
To return to original settings, repeat this step.
TEMPERATURE CONTROLS - OPERATING

20
TEMPERATURE CONTROLS - OPERATING
Using 1 Universal Temperature Controller.
Press the On/Off button on the temperature controller.
The ON indicator will glow on the Temperature Controller.
This indicates that the heater is ready to supply hot water
when a tap is opened.
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 on the temperature controller.
Caution: Always check water temperature before use.
Note:
With the hot water tap open and a temperature of 430C or higher selected,
if the temperature is decreased below 430C, and then raised again the
maximum available temperature will be 430C. For safety reasons
temperature ‘priority’ cannot be transferred between controllers when a
hot water tap is open.