Rinnai INFINITY 26i User manual

Service Manual
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.
REU-VR2632FFUD - 26i
REU-VR2632 FFU-HD-E- HD50i

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The Rinnai range of water heaters, when
correctly installed, comply with the
requirements of the United Kingdom
Water Regulations / Byelaws (Scotland).
These Products can be found listed in the
Water Fittings and Materials Directory.
The Rinnai water heaters are CE Marked as allowed by Technigas
26i - REU-VR2632FFUD-E
HD50e - REU-VR2632WDHD-E
HD50i - REU-VR2632FFUDHD-E
HD70e - REU-VRM3237WHD-E
HD70i - REU-VRM3237FFUHD-E
Certificate numbers: E0841/5386 Rev.5 - E0716/5360 Rev.05
E1061/5498 Rev.1 - E1060/5498 Rev.1
ID number: 0461BP0795 - 0461BO0739 - 0461BS0903 - 0461BS0903
Date of Issue: 23/12/2004 - 28/07/2003 - 26/10/2007 - 26/10/2007
Quality System Standard
ISO 9001 - 2000
The Design, Development, and Manufacture of Gas Water Heating Appliances done under Rinnai’s
Quality Management System is certified under the Quality Management System Standard ISO 9001.
Registration Number JQ0003D
Registered since: February 1994
Certified by JIA—QA Centre.

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This manual is intended for use by Gas Safe
Registered Engineers
November 2012

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CONTENTS……………………………………………………………………………..…………………3
CONTENTS

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Glossary of Terms and Symbols

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Rinnai water heaters 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.
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 dip switches on the PCB or with a localised
controller. For further information, please contact Rinnai.
Rinnai water heaters are powered flue appliances. This makes them 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 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.
Up to four external temperature controllers can be mounted remotely from the heater. One Standard
control is supplied with all appliances (except for HD range). The remote offers the following
additional features:
Localised temperature setting
Diagnostic information
Error Codes
‘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 and Status Monitor,
assisting with service.
FROST PROTECTION device built in as standard providing a power supply is maintained
FEATURES AND BENEFITS

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* Minimum operation pressure and flow based on temperature set point and inlet water conditions.
Model HD50e 26i - HD50i Units
Installation External Internal
G20 Nat Gas Press Low 1.29 1.75 mbar
G20 Nat Gas Press High 6.81 9.35 mbar
G31 Propane Press Low 2.21 2.36 mbar
G31 Propane Press High 11.2 11.1 mbar
Flue System Direct Forced Exhaust Forced, Room Sealed
Temp. Range Controllers 37-46, 48, 50, 55, 60, 65, 75 °C
Temp. via dip switches 40, 42, 50, 55, 60, 65, 75, 85 °C
Ignition Direct Electronic Ignition
Gas Consumption & Capacities min conditions ( Hi= net calorific value Hs= gross calorific value )
G20 Nat Gas: Input Qm: Hi/Hs | Useful output Pm 3.93/4.36 | 3.49 3.93/4.36 | 3.49 kW
G20 Nat Gas flow V 0.42 0.42 m3/hr
G31 Input Qm: Hi/Hs | Useful output Pm4.01/4.36 | 3.49 4.01/4.36 | 3.49 kW
G31 flow normal operating conditions Mm0.31 0.31 Kg./hr
Gas Consumption & Capacities nominal condit. ( Hi= net calorific value Hs= gross calorific value )
G20 Nat Gas: Input Qn: Hi/Hs | Useful output Pn49.8/55.3 | 45.9 48.6/54.0 | 44.8 kW
G20 Nat Gas flow ref. conditions Vr5.27 5.14 m3/hr
G31 Input Qn: Hi/Hs | Useful output Pn50.9/55.3 | 45.9 49.7/54.0 | 44.8 kW
G31 flow normal operating conditions Mn3.95 3.86 Kg./hr
Country of destination GB/IE
Gas category and pressure I2H G20-20mbar / I3P G31-37mbar
Type A3 Outdoor C13/33 Indoor
Max Flow 32 32 L/min
Min Operation Flow ON = 2.4* / OFF = 1.7* ON = 2.4* / OFF = 1.7* L/min
Water Pressure (Pw) 1.4* - 10.0 bar
Power Supply 230 V / 50 Hz
Electric Consumption (normal/stand-by/anti-frost) 50 / 2 / 100 66 / 2 / 100 Watts
Noise Level 50 50 dB (A)
Ignition safety time TSAmax 4.2 Sec.
Weight 23 24 Kg.
TECHNICAL DETAILS

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WATER FLOW CHARACTERISTICS
26i - HD50e - HD50i - HD70e - HD70i

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DIMENSIONS
26i - HD50i

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DIMENSIONS
HD50e

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TEMPERATURE CONTROLS
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.
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 four universal can be fitted with Rinnai water heaters. Universal Controllers allow temperature
selection only and one comes as standard with the water heater.
Deluxe Temperature Controllers are available as an optional extra.
These controllers have temperature selection, bath fill, voice prompt, and time clock functions.
When more than one universal Controller is used one may be set as the Master Controller to allow
temperatures above 50°C.
(ask Rinnai for more information)
Various water temperatures (°C) can be selected as follows:
Universal Controller:
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50°C
Master universal Controller:
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50, 55°C(60, 65°C HD)
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°C (60, 65°CHD)
If a temperature of 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
be 43°C. This provides additional safety for the user.
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.
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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TEMPERATURE CONTROLS
Remote temperature controllers provide control over the water temperature. Rinnai water heaters can
be operated with 1, 2, 3, 4 or no temperature controllers.
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.
Safety features
Whilst the hot water tap is open, the following
safety features apply:
Temperature selection cannot be transferred.
The temperature set point on the controller
with priority can always be lowered, but the
set point can only be raised to 43°C.
Other controllers are unable to take priority or
change the delivery temperature of the water.
If off, the controller cannot be turned on.
The temperature of the outgoing water
is constantly monitored by a built in
sensor.
If the temperature of the outgoing
hot water rises to more than 3ºC above the
selected temperature shown on the digital
display, or the preset limit if controllers are not
fitted, the burner will automatically go out.
The red operation indicator will also go out.
The burner will ignite again once the outgoing
hot water temperature falls to that shown on the
digital display (or the pre-set limit of the Rinnai
heater).
NOTE
NOTE

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TEMPERATURE CONTROLS
Table A Models
Information Given MC91 MC70 BC100
All Maintenance N/A ↓ + Power ↓ + Power
Error History Power + ↑ ↑ + Power ↑ + Power
Water Flow Rate ↑ + Power ________ ________
Outlet Water Temperature ↓ + Power ________ ________
Higher temperature Func-
tion
Transfer + Power Held for 5
sec till noise N/A
Turn off PIP Noise ↑ + ↓ Held for 5 sec till
noise
↑ + ↓ Held for 5 sec till
noise
↑ + ↓ Held for 5 sec till
noise
Table B
Maintenance Monitor
Section
No. Information Given Units Given Data Range
O1 Water Flow sensor Recognition (Flow Rate) Liter per Min 0 - ???
O2 Water Outlet Thermistor Temperature ˚C 0 - ???
O3 Combustion Time 100 Hours ( eg. 6 = 600hours ) 000 - ???
O4 Operation Frequency 100 ( eg. 6 = 600hours ) 000 - ???
O5 Fan Frequency Hz 0 - ???
O6 Remote Control Connection None 0 - 3
O7 Water Flow Servo Position Recognition None 0 - 2
O8 Fan Current 10mA 0 - ???
O9 Inlet Water Temperature ˚C 0 - ???
10 Bath Fill Amount Litre ( this counts the bath fill amount ) 0 - ???
11 Heat Exchanger Exit Thermistor ˚C 0 - ???
12 By Pass Servo Position Recognition Degrees 0 - ???

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TEMPERATURE CONTROLS
Using the Temperature Controllers
Press the ON/OFF button
o n a t e m p e r a t u r e
controller after making
sure that water is not
flowing.
The system will become
active, the temperature
will default to 40°C 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
T e m p e r a t u r e
Up or Down
arrow button
until the desired
temperature is
displayed on
t h e d i g i t a l
display.
Using Hot Water
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.
To turn off your hot water system
During normal operation the system is left on.
To turn the system off simply press the ON/OFF
button on any temperature controller (where
fitted). This will shut the water heater down
completely including the temperature controller
digital display.
The Digital Monitor will go out.
If hot water taps are opened when the Rinnai is
off, cold water will flow from the taps.
If the system is to be left off over the winter be
sure to drain it down if there is a possibility of
freezing temperatures.
Using High Temperature Display Controllers
You will need to program the Master controller if you want to display and use
temperatures over 50°C. Programming only needs to be done on Master
universal controller; other universal controllers will not allow this.
Deluxe Kitchen controllers are supplied already programmed to allow high
temperatures.
STEP 1: On the Master controller only press and hold the Transfer and ON/
OFF buttons simultaneously (see Fig. 1) until a “beep” is heard (approx. 5
seconds).
STEP 2: When the Primary controller is switched on it should be possible to select temperatures higher
than 50ºC. If not repeat STEP 1.
If the master controller is replaced, repeat STEP 1 above
for the new controller.
Fig. 1
NOTE
COOLER
HOTTER

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TEMPERATURE CONTROLS
Using 2 or more universal 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.
Using hot water.
Ensure the system is switched On by verifying the temperature display is lit.
Ensure the local controller has priority by verifying the Transfer LED
indicator is lit. If it is not then press the Transfer button once. This gives the
local controller priority of temperature over the system.
Select the desired temperature using the Hot water temp. buttons. The
selected temperature will be displayed on all controller displays. This is the
water temperature which will be supplied from the heater.
Bathroom temperatures should be no
more than 50°C.
Open the hot water tap. The appliance will
be activated and the In Use indicator will
be lit.
Using 4 Universal Temperature Controllers.
You will need to activate the fourth controller.
STEP 1: On the Master controller press and hold the Transfer and
ON/OFF buttons simultaneously (see Fig. 2) until a “beep” is heard
(approx. 5 seconds).
STEP 2: Check that the display on all Four controllers is lit and
displaying a temperature when switched on. If any ONE of the
controllers displays two dashes (see Fig. 1) in the display repeat
STEP 1.
If the master controller is replaced, repeat STEP 1
above for the new controller.
NOTE
Fig. 1
Fig. 2

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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 cannot be switched to
another controller when the water is flowing
through the water heater.
Controller 1 Controller 2
in use cannot take
priority
If a temperature over 50°C has
been selected on a controller and
priority of temperature selection is
transferred to another controller,
then back again, the temperature
on the controller will automatically
drop to 50ºC.
If the set point is 50°C or less it will
not alter.
This is a safety feature.
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 displayed at the controller and the
temperature at the tap.
Do not clean the control with solvents or
detergents.
Use only a soft damp cloth.
TEMPERATURE CONTROLS
Kitchen Kitchen
Bathroom
X
S
O
L
V
E
N
T

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TEMPERATURE CONTROLS
General Information
Commercial installations do not generally have controllers installed. These installations usually have one
permanent set temperature that is constant at all times. The public should not have access to alter the
temperature in these situations. These installations do not require controllers as the temperature can be
set by a series of dip switches on the PCB.
Exceptions to this are the following:
1.Circumstances where the required temperature is not available with the dip switches (for example
41°C or 47°C).
2.Circumstances where the temperature needs to be raised periodically by the building occupant in
order to flush the system.
3.Domestic situations where the user needs control of the temperature of the water so that different
temperatures can be used at different outlets.
In situations such as 1 and 2 the controllers should be installed in places out of reach of the public, such
as in the maintenance room or in a locked cupboard.
This Commercial Setting will allow the controller to come back on automatically
after a power cut at the temperature set point previous to the power cut,
regardless of whether water is flowing through the unit. This should only be used
for commercial installations.
The maximum temperature available on the primary universal remote controller is the set point on the
dip switches. If only one controller is installed it will not go beyond 50°C when first installed. To bypass
this see page 11.
Positioning 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 local 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. 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
50m.
NOTE
NEW FEATURE

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OPERATION
HD50e
26i - HD50i

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MAIN COMPONENTS
1. Gas Control Unit
1.1 Modulating Valve
This device is used by the PCB to adjust the volume of gas to the burner in proportion to the volumetric
flow rate of water in order to maintain a supply of constant temperature hot water amid changes in water
flow rates and incoming temperatures.
1.2 Change-over Solenoid Valves
Additional solenoid valves are included to section the burner and stage the control in several steps. This
gives the burner more steady combustion at the required capacity and allows the water heater to
operate at very low flow rates and temperature rises.
2. Flame Rod
Monitors combustion characteristics inside the combustion chamber. If the flame fails, gas supply is
stopped. Works through rectification of the combustion flame. An AC voltage is supplied to the flame
rod. Electrons can only pass from the rod to the earthed burner through the flame, and never from the
burner to the rod, so the resultant DC current is used to prove combustion. When the DC current is
present the burner has normal combustion, if the DC current is not present (or an AC current is present)
the unit shuts the solenoid valve.
3. Thermal Fuse
The thermal fuse is an electric link which must be intact for the unit to operate. If the thermal fuse
reaches a set temperature it will melt and the unit will shut down. The thermal fuse must be replaced if it
melts. It is to protect against overheating and heat exchanger splits where water may leak out and be
superheated into steam.
4. Overheat Safety (Bi-metal Switch)
This Bi-metal Switch is fixed at the inlet bend of the Heat Exchangers final pass. If the temperature
outlet from the heat exchanger reaches 97°C the bi-metal switch will open and the solenoid valve circuit
is broken. This will cease combustion in case of overheat.
5. Combustion Fan
The combustion fan supplies primary air into the burner wings and secondary air up through the Bunsen
style burners. The fan is DC low voltage and the speed is controlled by the PCB depending on the hot
water supply and temperature. The fan speed is compared to the current required to attain that speed
for air proving. If the fan current is over or under the parameters for the given speed the unit will shut
down on air proving.
6. Water Flow Servo with Water Flow Sensor
6.1 Water Flow Sensor
Water flow sensing is done with a small turbine that spins when water travels through it in the correct
direction. Each of the four fins on the turbine has a small magnet on it. Outside of the valve there is a
magnetic sensor that detects the speed that the turbine is revolving. The revolution speed is input to the
PCB which relates this speed to the water flow volume and determines whether it is sufficient for
ignition.
6.2 Water Volume Flow Servo
Water flow control is achieved through the use of servo driven water flow and bypass valves. The servo
motor is controlled by the PCB. The ‘Water Flow Valve’ restricts the flow of water into the heat
exchanger assembly if the programmed temperature cannot be achieved. This will limit the maximum
water flow, and will limit the hot water flow further when the burner is at high fire to ensure the
temperature set point is met.

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WIRING DIAGRAM
26i - HD50e - HD50i