Rinnai REU-2018W Manuel utilisateur

INFINITY

REU-2018W

REU-2020W

REU-2422W

REU-2425W

Infinity Compact Continuous Flow Gas Hot Water System

SERVICE MANUAL

All Rinnai products are certified by the

Australian Gas Association as compliant

to relevant Australian Standards.

Rinnai Australia Head Office is certified

as complying with ISO 9001 by SAI

Global.

Rinnai New Zealand has been certified to

ISO 9001 Quality Assurance by Telarc.

All Rinnai products are Certified to

WaterMark by SAI Global. WaterMark

certification is awarded to products and

fittings complying with safety and water

contamination standards.

SAI Global

A.C.N. 005 138 769 A.B.N. 74 005 138 769

Produced by Technical Services Department

2004 - Issue 2

No portion or part of this manual may be copied without prior permission from Rinnai Australia.

Rinnai Australia takes no responsibility for the accuracy or otherwise of information contained in

this manual, and reserves the right to make modifications and change specifications without notice.

Key to Warning Symbols

Failure to comply with the following instructions may result in serious

personal injuiry or damage to the appliance.

Be careful of possible electric shock. Wiring inside this appliance may

potentially be at 240 Volts.

Remove the plug from the source when carrying out any of the following

activities.

Read Fault Diagnosis and Wiring Diagram carefully to avoid incorrect wiring

Do not disassemble. Parts within cannot be exchanged or diagnosed faulty.

This manual has been compiled by Rinnai Australia Technical Services Department. While many

individuals have contributed to this publication, it will be successful only if you - the reader and

customer - find it useful. We would like to extend an invitation to users of this manual to make

contact with us, as your feedback and suggestions are valuable resources for us to include as

improvements. Rinnai are constantly working toward supplying improved appliances as well as

information, and specifications may be subject to alteration at any time.

SM Infinity REU-2425W

Issue No2

Please follow instructions carefully to ensure safe and appropriate service.

After completing the service and confirming that there no gas leaks or incorrect wiring,

test operation of unit according to the Customer Operating Instructions. After confirming

normal operation, explain what was serviced to the customer and operation principles if

necessary.

Infinity REU-2425W - 1 - Issue 2 - 5/07/04 ©Rinnai

Table of Contents

1. Introduction ................................................................................................... 3

2. Features ....................................................................................................... 4

3. Dimensions ................................................................................................... 5

4. Remote Controls .......................................................................................... 6

5. Safety Devices ............................................................................................. 9

6. Specification ............................................................................................... 10

7. Cut-away Diagram ...................................................................................... 11

8. Schematic Diagram .................................................................................... 12

9. Combustion Specification ........................................................................... 13

10. Dip Switch Positions ................................................................................. 14

11. Water Flows ............................................................................................. 16

12. Main Components .................................................................................... 18

13. Time Charts .............................................................................................. 20

14. Operation Flow Principle .......................................................................... 21

15. Operation Principles ................................................................................. 23

16. Fault Finding ............................................................................................. 25

17. Fault Finding Table ................................................................................... 26

18. Maintenance Monitor / Error History ......................................................... 27

19. Component Circuit Value Table ............................................................... 29

20. Wiring Diagram ......................................................................................... 30

21. Fault Diagnosis ......................................................................................... 31

22. Electrical Component Analysis ................................................................. 40

23. Gas Conversion ........................................................................................ 43

24. Gas Pressure Setting Procedure .............................................................. 44

25. Dismantling for service ............................................................................. 45

26. Exploded Diagram .................................................................................... 51

27. Parts list .................................................................................................... 55

Infinity REU-2425W - 2 - Issue 2 - 5/07/04 ©Rinnai

Glossary of Terms and Symbols

This glossary of terms and symbols is provided to assist you in understanding some of the

language used throughout this manual.

dB(A) - sound pressure level in decibels, “A” range

DC - direct current

AC - alternating current

WFCD - water flow control device

FB - feedback information

Hz - Hertz

IC - integrated circuit

kcal/h - kilocalorie per hour

kPa - kilopascals

LED - light emitting diode

L/min - Litres per minute

mA - milliamps

MJ/h - megajoule per hour

mm - millimetres

mmH2O - millimetres of water (guage pressure)

NOX- oxides of nitrogen (NO & NO2)

OHS - overheat switch

PCB - printed circuit board

CPU - central processing unit

POT - potentiometer

rpm - revolutions per minute

SV - solenoid valve

ø - diameter

oC - temperature rise above ambient

POV - modulating valve

TE - thermal efficiency

TH - thermistor

TIN - temperature of incoming water

TOUT - temperature of outgoing water

∆

Infinity REU-2425W - 3 - Issue 2 - 5/07/04 ©Rinnai

1. Introduction

The brand name Infinity refers to “Endless Hot Water”. The Infinity 24 has been developed in

response to the growing changes in the lifestyle of consumers, and the increasing diversification

and sophistication of demand in the marketplace.

The Infinity series offers reduced cost, advanced safety features, and an option to connect one,

two, or three remote control pads.

The Infinity 24 is delivered with the maximum hot water temperature of 50oC, with or without

remote controls connected.

About the Infinity

The front cover of each appliance in this series is formed from 0.6 mm coated steel, secured to

the main box assembly by 4 screws. Seals around the front cover and flue outlet prevent water

from entering the appliance.

Air inlets are situated in the front panel. The general layout of components is shown on the

cutaway diagram on page 11. All components are supported within a box formed from 0.8 mm

coated steel.

The heat exchanger occupies the top section of the box, and the burner is situated in a chamber

formed from 0.8 mm aluminised steel attached to the bottom of the heat exchanger.

The air for combustion is supplied by a fan which is connected to the burner box by a duct at the

left hand side of the appliance.

Gas and water controls are situated at the bottom right of the appliance, directly under the

manifold. The products of combustion are expelled from the appliance through a flue outlet

situated on the front of the appliance, at the top.

The burner assembly is made up of 18 identical stainless steel bunsen burners, secured by an

aluminised steel framework. An aluminium manifold with 18 integrally moulded injectors supplies

gas to the burners, and is attached to the lower front cover of the burner box.

There is one thermistor, it is located on the outgoing hot water supply tube, near the outlet of the

heater.

Infinity REU-2425W - 4 - Issue 2 - 5/07/04 ©Rinnai

2. Features

Installation

The light-weight, slim, and compact form enable easier, improved appearance installations. The

remote controls (where fitted) are connected to the appliance by 2-core non-polar cable, ensuring

easy wiring and eliminating misconnection problems.

Low Noise Level

Low noise level design enables these appliances to be installed in units, flats, townhouses, and

other high density residential areas with little concern about noise disturbances.

Safety

Various safety devices controlled by a micro-computer ensure complete safety. Also, the anti-

frost device (where fitted), automatically prevents the water inside the appliance from freezing by

using small electrical ceramic heaters connected to the pipework at strategic locations.

Economy

Direct electronic ignition to the main burner eliminates wasteful pilot gas consumption. The

combustion fan rpm is proportionally controlled with gas consumption. This maintains high energy

efficiency as the gas consumption changes.

Water Supply Control

The water supply capacity varies proportionally from 2.7 L/min to 24 L/min. A suitable volume of

hot water can be supplied throughout all seasons by the water flow control device and water flow

servo mechanism. REU 2425W model will supply up to 24L/min, (maximum unmixed), controlled

by an automatic electro-mechanical water flow device. See “Water Flows” on page 16 for precise

details on water flow.

Water Temperature Control

With a remote control connected, the hot water control range is between 37°C and 50°C (in 12

steps). With or without a remote control connected the outgoing hot water temperature is fixed to

50°C maximum with no remote. This means that the Infinity Series can be set to comply with

various State laws on temperature control in homes, child care centres, and elderly care centres.

The maximum temperature selectable on the bath remote control is 50°C (this is a safety feature).

Over Temperature Protection

All Infinity models incorporate a device to prevent the hot water temperature exceeding the pre-

set temperature by more than 3°C.

Temperature Locks

With the remote control(s) connected, the pre-set water temperature can only be altered between

37°C and 43°C while the hot water is flowing. This helps to avoid inadvertently increasing the

temperature to a hazardous level whilst someone is in the shower. While the water is flowing, the

remote control(s) can be turned off, but not on again.

Infinity REU-2425W - 5 - Issue 2 - 5/07/04 ©Rinnai

3. Dimensions

Note: All dimensions are in mm.

Infinity REU-2425W - 6 - Issue 2 - 5/07/04 ©Rinnai

4. Remote Controls

Remote Controls

Remote Controllers are an optional extra. 'Universal' and 'Deluxe' Controllers can be fitted.

Universal controllers allow temperature selection only. Deluxe controllers have temperature

selection, bath-fill and voice prompting functions. For detailed information regarding controller

operation refer to the 'How to use your water heater' booklet supplied with the appliance. Other

manufacturers' controllers are NOT compatible with this appliance.

Universal Controller (Model: MC-91-1A)

Up to 3 Universal Controllers can be fitted to the appliance. They are normally installed in the

areas where the majority of hot water is used, for example, the Kitchen, Bathroom, Ensuite and

Laundry.

Deluxe Controllers (Models: MC-70-2A) and (BC-70-2A)

Deluxe Controllers have 'Kitchen' (MC-70-2A) and 'Bathroom' (BC-70-2A) versions. 'Kitchen'

Controls are intended for the Kitchen or other convenient area where the majority of hot water is

used. 'Bathroom' Controllers are intended to be fitted in the Bathroom or ensuite and allow the

user to have a bath filled to the required level and temperature automatically.

Up to two ‘Deluxe” controllers can be connected as follows:

If a Third controller is required, a ‘Unviersal’ controller can be included as follows:

Positioning of Controllers

Controllers must be installed in shaded and clean locations. They should be fitted out of reach of

children (suggested height from floor at least 1500mm). Controllers are water resistant, however,

durability is improved when positioned outside the shower recess or at leat 400mm above the

highest part of a sink, basin or bath.

Kitchen Bathroom

MC-70-2A

MC-70-2A BC-70-2A

Kitchen Bathroom Laundry

MC-70-2A BC-70-2A MC-91-1A

BC-70-2A

120

MC-91-1A

Infinity REU-2425W - 7 - Issue 2 - 5/07/04 ©Rinnai

DO NOT INSTALL THE CONTROLLERS

• NEAR A HEAT SOURCE, SUCH AS A COOK TOP, STOVE OR OVEN. HEAT, STEAM,

SMOKE AND HOT OIL MAY CAUSE DAMAGE.

• IN DIRECT SUNLIGHT.

• OUTDOORS UNLESS AN ENCLOSURE IS PROVIDED WHICH PROTECTS THE

CONTROLLER AGAINST SUNLIGHT AND DUST INGRESS.

• AGAINST A METAL WALL UNLESS THE WALL IS EARTHED IN ACCORDANCE WITH AS/

NZ3000.

Remote Controller Connection

Remote controls operate at extra low voltage (12 Volts DC) which is supplied from the appliance.

Controllers are supplied with 15 m of electrical cable. The cable wires for connection to the

appliance are fitted with spade terminals.

Extension cables are available from Rinnai. Alternatively, a two core sheathed (double insulated)

flex with minimum cross-sectional area of 0.5 mm² can be used. Maximum cable length is 50 m.

For connection refer to the “CONNECTING REMOTE CONTROL CABLES” section.

Water Heater and Controller installation configurations

If there is a label on the appliance casing that contains the text ”This appliance delivers water

not exceeding 50°C”, local regulations may permit it’s installation without a Temperature

Limiting Device. Installations without a Temperature Limiting Device are shown in Diagram 1.

If you are unsure about your local regulations contact your regulating authority or Rinnai.

If the appliance does not have this label, or your local regulations require installation with a

Temperature Limiting Device then install the appliance in accordance with Diagram 2.

IMPORTANT: If the appliance is to deliver water primarily for the purposes of personal hygiene

in an early childhood centre, primary or secondary school, nursing home or similar facility for

young, aged, sick or disabled persons as defined in AS/NZ3500.4 a Temperature Limiting Device

(TLD), such as a Tempering Valve, may be required even if the appliance is set to 50º C or less.

For these types of applications contact Rinnai.

50º C

KITCHEN

Temperature

controller

(optional)

Temperature

controller

(optional)

Temperature

controller

(optional)

Temperature

controller

(optional)

LAUNDRY

BATHROOM

ENSUITE

Diagram 1. 50º C Appliance

KITCHEN

Temperature

controller

(optional)

Temperature

controller

(optional)

LAUNDRY BATHROOM

Temperature

controller

(optional)

Temperature

controller

(optional)

ENSUITE

TLD

Diagram 2. Not a 50º C Appliance

Note: TLD = Temperature Limiting Device.

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