Rinnai REU-V1616WF User manual

REU-V1616WF
INFINITY 16 FE Internal
Rinnai High Capacity 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

© Copyright Rinnai Australia Pty Ltd ACN 005 138 769 ABN 74 005 138 769
All rights reserved
Produced by Technical Services Department
September 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-V1616WF
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-V1616WF - iv - Issue 1 - 21/11/03 ©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 ................................................................................................................ 7
5. Installation ................................................................................................................. 8
6. Remote Controls ...................................................................................................... 11
7. Cutaway Diagram .................................................................................................... 14
8. Operational Flow Chart ........................................................................................... 15
9. Operation Principles ................................................................................................ 16
10. Main Components .................................................................................................. 17
11. Time Charts ............................................................................................................ 19
12. Wiring Diagram ..................................................................................................... 20
13. Dip Switch Settings ............................................................................................... 21
14. Fault Finding .......................................................................................................... 22
15. Component Circuit Value Table ............................................................................ 24
16. Component and Circuit Checks ............................................................................. 25
17. Maintenance Monitor / Error History .................................................................... 31
18. Gas Pressure / Gas Conversion Procedure ............................................................. 33
19. Dismantling for Service ......................................................................................... 34
20. Exploded Diagram ................................................................................................. 42
21. Parts List ................................................................................................................ 46
SERVICE CONTACT POINTS ............................................................................... 50

Infinity REU-V1616WF - v - Issue 1 - 21/11/03 ©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-V1616WF - 1 - Issue 1 - 21/11/03 ©Rinnai
1. Introduction
The Rinnai V-Series hot water units represents the latest technology in continuous flow, temperature
controlled hot water.
Features
• The Infinity 16 NEVER RUNS 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. 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.
• ‘Standard’ Remote Controllers are available as an optional extra. Depending on the models chosen,
these offer - Localised temperature control for up to one kitchen and two bathroom controllers
• 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-V1616WF - 2 - Issue 1 - 4/05/04 ©Rinnai
2. Specifications
Note 1: The default factory setting is 55ºC for REU-V1616WF. 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.
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.
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Infinity REU-V1616WF - 3 - Issue 1 - 21/11/03 ©Rinnai
Sensors and Safety Devices
• 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)
Test Point (kPa) * * Gas Input (MJ/hr)
Low High Low High
Natural ø 1.7 0.21 0.74 20 125
Propane ø 1.25 0.22 0.92 20 125
°
°

Infinity REU-V1616WF - 4 - Issue 1 - 21/11/03 ©Rinnai
3. Water Flow Rates and Pressures
Water Flows
Table 1 shows unmixed 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. Higher mixed water flow rates may be available at low temperature rises by mixing hot water
from the outlet of the water heater with cold water from the mains supply as illustrated below:
Water Flows can also be calculated by the following formula :
Q = Heat energy available in kW = 28 kW for the REU-V1616WF
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 = 28
C = 4.2
M = 60 x ( 28 / (4.2 x 10) ) = 40 l/min. Since 40 is greater than 16 this flow rate is mixed.
°
∆°
°
°
∆°

Infinity REU-V1616WF - 5 - Issue 1 - 21/11/03 ©Rinnai
Table 1: Approximate Water Flows and Gas Usage Table - REU-V1616WF
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-V1616WF - Internal 18-125
20-125 0.27 16 960 72 25 0.27 16 960 72 50 0.27 16 960 72 75 0.27 16 960 72 100
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-V1616WF - Internal 18-125
20-125 0.27 16 960 72 125 0.22 13.2 792 60 125 0.19 11.4 684 44 125 0.17 10.2 612 35 125
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-V1616WF - Internal 18-125
20-125 0.15 9 540 29 125 0.13 8 480 24 125 0.12 7.2 434 21 125 0.11 6.6 396 20 125
Models (All Pre-set Temperatures)
* Flows (L/Sec) are unmixed, at the outlet of the water heater.
20
25 30 35 40
51015
605045
Models (All Pre-set Temperatures)
Models (All Pre-set Temperatures)
55