Rinnai INFINITY REU-V2626W User manual

INFINITY REU-V2626W
HD200E REU-V2632WC
Rinnai High Capacity Continuous Flow Gas Hot Water System
SERVICE MANUAL

ISO 9001 Model for Quality Assurance in design/development, production, installation and
servicing, aimed primarily at achieving customer satisfaction by preventing nonconformity
at all stages from design through to servicing.
ISO 9002 Same as ISO 9001 but excluding design.
AG 102 Approval requirements for gas water heaters as set by The Australian Gas Association and
Australian Liquefied Petroleum Gas Association Ltd, to ensure proper safety performance
and quality levels are achieved.
Proudly a member of The Australian Gas Association.
All of our products are AGA tested and approved.
Distributed and serviced in Australia under a Quality
System certified as complying with ISO 9002 by
Quality Assurance Services.
Rinnai New Zealand has been certified to ISO 9001 Quality
Assurance by Telarc.
Certified to WaterMark by Quality Assurance
Services. WaterMark certification is awarded to
products and fittings complying with safety and water
contamination standards.
Comparative Energy Consumption tested to The Australian
Gas Association requirements of Australian Gas Code AG
102.
An energy rating of 5 stars refers to an efficiency of
approximately 80%, that is, 80% of gas consumed is
converted to useful heat.

© Copyright Rinnai Australia Pty Ltd ABN 74 005 138 769 ACN 005 138 769
All rights reserved
Produced by Customer Technical Services
August 2003 - Issue 1.
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.
Failure to comply with these instructions may result in serious personal injury or damage to the
appliance.
This manual has been published by Rinnai Australia Technical Services. 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 supply improved appliances as well as information, and
specifications may be subject to alteration at any time.
SM REU-V2626W/REU-V2632WC
Issue No1
WARNING
ALL WIRING INSIDE THIS APPLIANCE MAY BE AT 240 VOLTS POTENTIAL
ALL SERVICE WORK MUST BE CARRIED OUT BY AN AUTHORISED PERSON.
DO NOT TEST FOR GAS ESCAPES WITH AN OPEN FLAME

Infinity REU-V2626W / HD200E REU-V2632WC - iv - Issue 1 - 10/10/03 ©Rinnai
Table of Contents
Glossary of Terms and Symbols ................................................................................. v
1. Introduction ................................................................................................................ 1
2. Specifications ............................................................................................................. 2
3. Water Flow Rates and Pressures ................................................................................ 4
4. Dimensions ................................................................................................................ 8
5. Remote Controls ........................................................................................................ 9
6. Cutaway Diagram .................................................................................................... 13
7. Operational Flow Chart ........................................................................................... 14
8. Operation Principles ................................................................................................ 15
9. Main Components .................................................................................................... 17
10. Time Charts ............................................................................................................ 18
11. Wiring Diagram ..................................................................................................... 20
12. Dip Switch Settings ............................................................................................... 22
13. Fault Finding .......................................................................................................... 24
14. Component Circuit Value Table ............................................................................ 26
15. Component and Circuit Checks ............................................................................. 27
16. Maintenance Monitor / Error History .................................................................... 34
17. Gas Pressure Setting Procedure ............................................................................. 36
18. Gas Conversion Procedure ..................................................................................... 38
19. Dismantling for Service ......................................................................................... 42
20. Exploded Diagram ................................................................................................. 51
21. Parts List ................................................................................................................ 55
REU-V2626W ...................................................................................................................56
REU-V2632WC.................................................................................................................59
SERVICE CONTACT POINTS ............................................................................... 63

Infinity REU-V2626W / HD200E REU-V2632WC - v - Issue 1 - 10/10/03 ©Rinnai
Glossary of Terms and Symbols
dB(A) - sound pressure level in decibels, “A” range
DC - direct current
AC - alternating current
WFCD - water flow control device
FB - feedback information
FF - feedforward 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 (gauge pressure)
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-V2626W / HD200E REU-V2632WC - 1 - Issue 1 - 10/10/03 ©Rinnai
1. Introduction
The Rinnai V-Series hot water units represents the latest technology in continuous flow, temperature
controlled hot water.
Features
• The Infinity 26 and the HD200E 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 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 is delivered with a maximum preset temperature of 55ºC and the
HD200E at 65°C. If required, the temperature limits can be changed by a service technician. For
further information, please contact Rinnai.
• The Infinity is a power flued appliance. It is 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 3ºC above the selected temperature shown
on the Digital Monitor (or the pre-set limit when Remote Controls are not fitted), the burner will
automatically go out. The burner will ignite again once the outgoing hot water temperature falls below
the temperature shown on the Digital Monitor (or the pre-set limit).
• The burner lights automatically when the hot water tap is opened, and goes out when the tap is closed.
IGNITION IS ELECTRONIC, therefore there is not pilot light. When the hot water tap is off, no gas is
used.
• ‘Deluxe’ or ‘Standard’ Remote Controllers are available as an optional extra. Depending on the models
chosen, these offer the following additional features :
- Bath fill function
- Voice Prompting
- Localised Temperature Control for up to one kitchen and two bathroom controllers
- Clock
• Temperatures selected at the controllers are retained in the SYSTEM MEMORY.
• Operating NOISE LEVEL IS VERY LOW.
• ERROR MESSAGES ARE DISPLAYED on the Remote Controllers, assisting with service.

Infinity REU-V2626W / HD200E REU-V2632WC - 2 - Issue 1 - 4/12/03 ©Rinnai
2. Specifications
Note 1: The default factory setting is 55ºC for REU-V2626W. 65°C for REU-V2632WC. The unit can be ordered from Rinnai to be pre-set to any of the other
temperatures listed. The unit can be pre-set to any of the temperatures listed by a suitably qualified person. * Temperatures set at 85° C for REU-V2632W
models only.
Controllers are available with default temperatures up to 75º C. When fitted with controllers, only temperatures not exceeding the default temperatures can
be selected. When fitted without controllers, the unit will deliver water at the default temperature. Controllers are not available with 85° C settings.
Note 2: Unit will operate at lower pressures but the maximum rated flow of 32L/min. will not be achieved (REU-V2632WC).
Model No. Infinity REU-V2626W / HD200E REU-V2632WC
Type of Appliance Temp.controlled continuous Flow Gas Hot Water Unit
Operation With/without remote controls, mounted in kitchen, bathroom, etc.
Exhaust System Forced Flue
Installation Externally mounted
Available Default Temperatures (Note 1):
(without Remote Controllers)
40º C, 43º C, 50º C, 55º C, 60º C, 65º C, 75º C, (*85º C)
(Set by combination of Dip switches on PCB).
Temperature Range (with Remote Controllers) Kitchen controller : 37 ~ 55º C
Bathroom controller : 37 ~ 50º C
Dimensions (mm) Width: 350 Height: 600 Depth: 224
Electrical
Consumption
Normal 65 W
Standby 6 W (with 1 Remote Control)
Anti-frost 100 W
Noise Level 49 dB(A)
Weight (Kg) 21
Connections Gas 20A (R3/4)
Cold Water Supply 20A (R3/4)
Hot Water Supply 20A (R3/4)
Ignition system Direct Electronic Ignition
Max / Min.Gas
Consumption
Natural Gas 199 ~ 15.7MJ/h
Propane Gas 199 ~ 15.7MJ/h
kW Output (kW) REU-V2626W: 45.3 REU-V2632WC: 47.2
Hot Water Capacity 2.4 to 26 L/min.
Thermal efficiency 83%
NOXaf 46 ppm
Minimum Operating Water Flow (Note 2: - V2632WC): 2.4 L/min.
Minimum Operating Pressure (Note 2: - V2632WC): REU-V2626W - 200 kPa REU-V2632WC - 140 kPa
Maximum Operating Water Flow REU-V2626W - 26 L/min. REU-V2632WC - 32 L/min.
Nominal Operating
Pressure
Less than 60°C REU-V2626W - 200 kPa REU-V2632WC - 140 kPa
Greater than or equal to 60°C 200 ~ 1000 kPa
Water Flow Control - V2626W Water flow sensor, Electronic water flow control
Water Flow Control - V2632WC Electronic Water flow sensor flow control & heat exchanger By-
Power Supply Infinity Unit AC 240 Volts (50 Hz)
Remote Control (optional) DC 12 Volts (Digital)
Safety Device
Flame Failure Flame rod
Boil dry Water flow sensor
Remaining Flame (OHS) 97º C bi-metal switch
Over temperature 95º C lockout thermistor
Fusible link 129º C Thermal Fuse
Pressure relief valve Opens 2060 kPa, Closes 1470 kPa
Combustion fan rpm check Integrated circuit system
Over current Glass fuse (3 Amp).
Remote Control
(Optional)
Kitchen control MC-91-1A or MC-70-2A
Bathroom control MC-91-1A or BC-70-2A
Second Bathroom control MC-91-1A or BC-70-2A
Third Bathroom control MC-91-1A
Remote Controller Cable (Optional) Two core sheathed (double insulated) flex with min.cross-sectional
Manifold Electronic Control System (optional) MSA-2M, MSA-2S

Infinity REU-V2626W / HD200E REU-V2632WC - 3 - Issue 1 - 10/10/03 ©Rinnai
Sensors and Safety Devices
• Heat Exchanger Thermistor: Measures hot water temperature at heat exchanger outlet. If water
temperature reaches a predetermined limit, gas supply is stopped.
• Hot Water Delivery Thermistor: Measures hot water temperature at the outlet valve (i.e. the ‘mixed’
temperature).
• Flame Rod: Monitors combustion characteristics inside the combustion chamber. If the flame fails, gas
supply is stopped.
• Overheat Switch: Situated on the heat exchanger, gas supply is stopped when water temperature
reaches 97 C for a number of seconds.
• Fusible Link: Situated on the heat exchanger, electrical power supply is stopped if the temperature
exceeds 129 C.
• Water Pressure Relief Valve: Safeguards the water circuit against excessive inlet pressure. Opens at
2060 kPa, closes at 1470 kPa.
• Electrical Fuse: (3A glass fuse) prevents against over-current.
Surge Protector: prevents against over-current.
• Boil Dry Prevention: If water flow sensor detects no flow, gas supply is stopped.
• Combustion Fan Speed Sensor: In case of combustion fan defect (no rotation of fan) gas supply is
stopped.
• Temperature Cutout: If the delivered hot water temperature rises above the required delivery
temperature for a number of seconds, the gas supply is stopped.
Combustion Specifications
* * The TPP is measured with the cover off the appliance at the regulator test point with supply pressures
of 1.13 kPa (NG) and 2.75 kPa (Propane).
Gas Type Injector
Size (mm)
Nominal TPP (kPa) * * Gas Input (MJ/hr)
Low High Low High
Natural
1.15 0.140 .79 16 199
1.80
Propane
( NZ LPG )
0.75 0.219 1.15 16 199
1.15
°
°

Infinity REU-V2626W / HD200E REU-V2632WC - 4 - Issue 1 - 10/10/03 ©Rinnai
3. Water Flow Rates and Pressures
Water Flows
Table 1 shows unmixed and mixed water flow rates and approximate gas consumptions for various
temperature rises. The unmixed flow rates are the flow rates available at the given temperature rise directly
at the outlet of the water heater. The mixed water flow rates are available at the given temperature rise by
mixing hot water from the outlet of the water heater with cold water from the mains supply.
Water Flows can also be calculated by the following formula :
Q = Heat energy available in kW = 46kW for the REU-V2626W and REU-V2632WC
C = Specific heat of water = 4.2KJ/Kg C. C does not change for the purpose of this calculation.
T = Temperature rise required ( C)
Example:
What is the flow rate available with an incoming water temperature of 10 C and a required temperature of
20 C?
T = 20 - 10 = 10 C
Q = 46
C = 4.2
M = 60 x ( 46 / (4.2 x 10) ) = 66 l/min. Since 66 is greater than 26 this flow rate is mixed. This result
corresponds with the value in Table 1.
°
∆°
°
°
∆°

Infinity REU-V2626W / HD200E REU-V2632WC - 5 - Issue 1 - 10/10/03 ©Rinnai
Approx.Water Flows & Gas Usage - REU-V2626W / REU-V2632WC All Preset Temp & Less than 60°C.
Temp
Ris
e
(
º C
)
A
pprox. Min
/ Max Gas
Input
(MJ/hour)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
REU-V2626W - Ext. 16-199 0.43 26 1560 200 40 0.43 26 1560 200 80 0.43 26 1560 200 120 0.43 26 1560 200 160
Temp
Ris
e
(
º C
)
A
pprox. Min
/ Max Gas
Input
(MJ/hour)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
REU-V2626W 16-199 0.43 26 1560 200 199 0.36 21.6 1296 100 199 0.31 18.6 1116 70 199 0.27 16.2 972 50 199
Temp
Ris
e
(
º C
)
Approx.
Min / Max
Gas Input
(MJ/hour)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
REU-V2626W 16-199 0.24 14.4 864 44 199 0.22 13.2 792 32 199 0.2 12 720 25 199 0.18 10.8 648 20 199
Temp
Ris
e
(
º C
)
A
pprox. Min
/ Max Gas
Input
(MJ/hour)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
Rinnai HD200E
(REU-V2632WC) 16-199 0.53 32 1920 140 47 0.53 32 1920 140 94 0.53 32 1920 140 141 0.53 32 1920 140 188
Temp
Rise (º C)
A
pprox. Min
/ Max Gas
Input
(MJ/hour)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
Rinnai HD200E
(REU-V2632WC) 16-199 0.44 26.4 1584 100 195 0.37 22.2 1332 65 199 0.32 19.2 1152 50 199 0.28 16.8 1008 40 199
Temp
Ris
e
(
º C
)
Approx.
Min / Max
Gas Input
(MJ/hour)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
Rinnai HD200E
(REU-V2632WC) 16-199 0.25 15 900 30 199 0.22 13.2 792 25 199 0.2 12 720 23 199 0.19 11.4 684 20 199
Temp
Rise (º C)
Approx.
Min / Max
Gas Input
(MJ/hour)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
L/sec L/min L/hr
Min Water
Pressure
(kPa)
Approx
Gas
Cons.
(MJ/h)
Rinnai HD200E
(REU-V2632WC) 16-199 0.17 10.2 612 19 199 0.16 9.6 576 18 199 0.15 9 540 17 199 0.14 8.4 504 16 199
Models (All Pre-set Temperatures)
Models (Preset temperatures
less than 60° C)
Models (Preset temperatures
less than 60° C)
15
Models (Preset temperatures
less than 60° C)
Models (Preset temperatures
less than 60° C)
20
25 30 35 40
51015
605045
80 20
25 30 35
510
40
45 50 55 60 65 70 75
Models (All Pre-set Temperatures)
Models (All Pre-set Temperatures)
55