Rinnai Infinity 32e User manual

INFINITY 32eand HD70e
Infinity High Capacity Continuous Flow Gas Hot Water System
SERVICE MANUAL

The Rinnai Infinity32e and
HeavyDuty70e water heater,
when correctly installed, comply
with the requirements of the
United Kingdom Water Regula-
tions / Byelaws (Scotland).
These Products can be found
listed in the Water Fittings and
Materials Directory.
The Rinnai Infinity32e water heater
is CE Marked for UK and Ireland as
allowed by Technigas of Belgium.
Certificate number E0715/5344
ID number 0461BO0715
Date of Issue 14 July2003
Quality System Standard
ISO 9001 - 1994
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 Japan Gas Appliances Inspection Association.

Produced by Rinnai Technical Services Department
August 2004- Issue 1.
No portion orpart of this manual may becopied without prior permission from Rinnai U.K.
Rinnai U.K. 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 U.K. 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.
Issue No1
WARNING
ALL WIRING INSIDE THIS APPLIANCE MAY BE AT 230 VOLTS POTENTIAL
ALL SERVICE WORK MUST BE CARRIED OUT BY AN AUTHORISED PERSON.
DO NOT TEST FOR GAS ESCAPES WITH AN OPEN FLAME

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Table of Contents
Glossary of Terms and Symbols ................................................................................ iv
1. Introduction ................................................................................................................ 1
2. Specifications ............................................................................................................. 2
3. Water Flow Rates and Pressures ................................................................................ 4
4. Dimensions ................................................................................................................ 7
5. Installation ................................................................................................................. 8
6. Remote Controls ........................................................................................................ 9
7. Cutaway Diagram .................................................................................................... 13
8. Operational Flow Chart ........................................................................................... 14
9. Operation Principles ................................................................................................ 16
10. Main Components .................................................................................................. 17
11. Time Charts ............................................................................................................ 18
12. Wiring Diagram ..................................................................................................... 19
13. Dip Switch Settings ............................................................................................... 20
14. Fault Finding .......................................................................................................... 22
15. Component Circuit Value Table ............................................................................ 25
16. Component and Circuit Checks ............................................................................. 26
17. Maintenance Monitor / Error History .................................................................... 37
18. Gas Pressure Setting Procedure ............................................................................. 39
19. Gas Conversion Procedure ..................................................................................... 41
20. Dismantling for Service ......................................................................................... 43
21. Exploded Diagram ................................................................................................. 49
22. Parts List ................................................................................................................ 53
SERVICE CONTACT POINTS ............................................................................... 57

Infinity REU-V3232W / HD250E REU-V3232WC -iv - Issue 1-8/09/03 ©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
kW-kilowatts
LED - light emitting diode
L/min - Litres per minute
mA - milliamps
mbar -millibars of pressure
mm - millimetres
bar -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
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1. Introduction
The Rinnai V-Series hot water units represents the latest technology in continuous flow, temperature
controlled hot water.
Features
•The Infinity 32 and HD70e 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 32e is delivered with a maximum preset temperature of 55 degree C
and 65º C for the Heavy Duty 70e. If required, the temperature limitscanbe changedby a
service technician. For further information, please contact RinnaiUK.
• 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 3 C 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.
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2. Specifications
Note 1: The default factory setting is 55° C for Infinity 32e and 65°CforHD 70e.Theunit can be ordered fromRinnai UK 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 75° 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 setting.
Note 2: Unit will operate at lower pressures but the maximum rated flow of 32L/min. will not be achieved.
Typeofappliance Temperaturecontrolled continuous flow gas ho
t
wate
r
syste
m
Operation With / without remote controls, mounted in kitchen, bathroom etc.
Exhaust system Forced Flue
Rinnai model number Infinity 32e
Heavy Duty 70e
Installation Externally mounted
Dimensions Width －470mm
Height －600mm
Depth －220mm
Weight 29 kilograms
Maximum / Minimum
Gas consumption
Natural gas：69 - 5.6kW
Propane gas：69 - 5.6kW
Connections Gas connection －3/4inch BSP
Cold waterconnection －3/4 inch BSP
Hot water connection －3/4 inch BSP
Ignition system Direct electronic ignition
Electrical consumption Normal －83 W
Standby －12 W（With 1Remotecontrol）
With Anti-frost protection －100 W
Hot watercapacity（Raised25℃） 32 to 2.7 L/min
Thermalefficiency81%
Kitchencontroller（MC):37 - 55℃Temperature range
(with remote) Bathroom controller (BC)：37- 50℃
Default temperature control
(without remote)
40℃、43℃、50℃、55℃、60℃、65℃、75℃、85℃
（Set by combination of Dip switches on PCB ）
Water flow control Electronic Water flow sensor, flow control & heat exch.
By-pass flow control.
Minimumoperating water pressure(Note 2)1.8bar
Nominaloperating water pressure2.0 bar - 10.0 bar
Minimumoperatingwaterflow2.7L/min
Maximum operating water flow 32 L/min
Power supplyAppliance－AC230 Volts 50Hz
Remote control －DC 12 Volts （Digital ）
Noise Level 49 dB(A)
Flame failure －Flame rod
Boil dry －Water flow sensor
Remaining flame （OHS ）－97℃bi-metal switch
Over temperature －95℃lockout thermistor
Fusible link －129℃Thermal Fuse
Pressure relief valve－Opens 20.6bar.Closes 14.7bar
Combustion fan rpm check －Integrated circuit system
Safety device
Over current －Glass fuse （3 Amp.）
Kitchen control －MC-91-1A or MC-70-2A
Bathroom control －MC-91-1A or BC-70-2A
Remote control optional
Second bathroom control －MC-91-1A or BC-70-2A
Remote Controller Cable ( optional ) Two core sheathed (double insulated), flex with min. cross-sectional area of 0.5m²
Manifold Electronic Control
System(optional) MSA-S

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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
21.0bar,closes at15.0bar.
• 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 20 mbar (NG) and37 mbar (Propane).
Gas Type Injector
Size (mm)
Nominal TPP (mbar)* * Gas Input (kW)
Low High Low High
Natural
1.05
1.87.45.6 69
1.65
Propane 0.65
3.5 5.6 69
0.95
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3. Water Flow Rates and Pressures
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:
M = 60 x ( Q / C x T )
Where M = Water flow rate in litres/minute. If M is ≤ to 32, the water is unmixed, the entire flow goes
through the water heater. If M > 32 the hot water from the unit is mixedwith cold water.
Q=Heat energy available in kW = 56kW for theInfinity 32e and 70e
C=Specific heat of water = 4.2KJ/Kg C. This doesnot change for the purpose of this calculation.
T = Temperature rise required ( C)
Example:
What is the flow rate available with an incoming watertemperature of 10 C and a requiredtemperature of
20 C?
T = 20 - 10 = 10 C
Q = 56
C = 4.2
M = 60 x ( 56 / (4.2 x 10) ) = 80 l/min. Since 80 is greater than 32, this flow rate is mixed. This result
corresponds with the value in Table 1.
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Table 1: Approximate Water Flows and Gas Consumption - Rinnai Infinity 32e and 70e
Temperature
Rise C
51015
L/min L/hr kW L/min L/hr kW L/min L/hr kW
thru unit 32 1920 13.932192027.8 32192041.7
maximum 160 9600 69 80480069 53320069
Temperature
Rise C
20 25 30
L/min L/hr kW L/min L/hr kW L/min L/hr kW
thru unit 32 1920 55.6 32192069 26.5158969
maximum 40 2400 69 32192069 26.5158969
Temperature
Rise C
thru unit
35 40 45
L/min L/hr kW L/min L/hr kW L/min L/hr kW
22.7 1362 69 19.91191 69 17.7105969
Temperature
Rise C
thru unit
50 55 60
L/min L/hr kWL/min L/hr kW L/min L/hrkW
15.9953 69 14.4867 69 13.279469
Temperature
Rise C
thru unit
65 70 75
L/min L/hr kW L/min L/hr kW L/min L/hr kW
12.2 73369 11.3 68169 10.663569
Temperature
Rise C
(unmixed and
mixed)
80 85 90
L/min L/hr MJ/hr L/min L/hr MJ/hr L/min L/hr MJ/hr
9.9 596.0 250.0 9.3 561.0 250.0 8.8 530.0 250.0
°
°
°
°
°
°