Rinnai COMBI i060C User manual

Rinnai I-Series Condensing Boiler Combi Manual
Central Heang and Domesc Hot Water
INSTALLATION AND OPERATION MANUAL
I-Series Condensing Boiler
Wall-Mounted, Gas-Fired Combi Boiler
Cered to ANSI Z21.13
and CSA 4.9
COMBI MODELS
i060C (REB-A1847FF-US)
i090C (REB-A2647FF-US)
i120C (REB-A3558FF-US)
READ AND SAVE THIS MANUAL
If the informaon in these instrucons are not followed exactly, a re or explosion may
result causing property damage, personal injury, or loss of life.
 Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
 WHAT TO DO IF YOU SMELL GAS
 Do not try to light any appliance.
 Do not touch any electrical switch; do not use any phone in your building.
 Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instrucons.
 If you cannot reach your gas supplier, call the re department.
 Installaon and service must be performed by a qualied installer, service agency or the gas supplier.
WARNING
KH167-0771-1(00)

2 Rinnai I-Series Condensing Boiler Combi Manual
1. Welcome...................................................................................................................................................... 4
2. Safety........................................................................................................................................................... 5
2.1 Safety Symbols..................................................................................................................................................... 5
2.2 Safety Precauons ............................................................................................................................................... 5
3. About the Boiler........................................................................................................................................... 7
3.1 Front View............................................................................................................................................................ 7
3.2 Boom View ........................................................................................................................................................ 8
3.3 Components......................................................................................................................................................... 9
3.4 Specicaons ..................................................................................................................................................... 10
3.5 Dimensions......................................................................................................................................................... 11
3.6 Accessories......................................................................................................................................................... 13
4. Installaon ................................................................................................................................................. 14
4.1 Installaon Guidelines ....................................................................................................................................... 14
4.2 What You’ll Need ............................................................................................................................................... 15
4.3 Items Included.................................................................................................................................................... 16
4.4 Choose an Installaon Locaon......................................................................................................................... 17
4.5 Mount the Boiler to the Wall............................................................................................................................. 19
4.6 Fill the Condensate Collector............................................................................................................................. 20
5. Venng ...................................................................................................................................................... 21
5.1 Guidelines .......................................................................................................................................................... 21
5.2 Venng Installaon Sequence ........................................................................................................................... 22
5.3 Terminaon Consideraons............................................................................................................................... 22
5.4 PVC Venng Safety Switch................................................................................................................................. 23
5.5 Venng Opons ................................................................................................................................................. 25
6. Gas Supply ................................................................................................................................................. 46
6.1 Connect the Gas Supply ..................................................................................................................................... 46
6.2 Gas Operang Instrucons ................................................................................................................................ 47
6.3 Gas Pipe Sizing Reference Tables....................................................................................................................... 48
7. DHW System Piping.................................................................................................................................... 50
7.1 Guidelines .......................................................................................................................................................... 50
7.2 Instrucons ........................................................................................................................................................ 50
7.3 Piping Diagram for a Basic DHW Installaon ..................................................................................................... 51
8. CH System Piping........................................................................................................................................ 52
8.1 Guidelines .......................................................................................................................................................... 52
8.2 Instrucons ........................................................................................................................................................ 52
8.3 Common CH Components.................................................................................................................................. 53
8.4 Piping Diagram for a Basic CH System (Without Hydraulic Separaon)............................................................ 55
8.5 Piping Diagram for a Basic CH System (With Hydraulic Separaon) ................................................................. 56
8.6 Hydraulic Separaon.......................................................................................................................................... 57
8.7 Connect the Pressure Relief Valves (DHW and CH) ........................................................................................... 59
8.8 Connect the Condensate Drain Line .................................................................................................................. 60
8.9 Condensate Pump Safety Switch Wiring............................................................................................................ 61

Rinnai I-Series Condensing Boiler Combi Manual 3
9. Power Supply ............................................................................................................................................. 63
9.1 Guidelines .......................................................................................................................................................... 63
9.2 Electrical Connecons........................................................................................................................................64
9.3 Post-Power Supply Connecon Checklist .......................................................................................................... 64
10. Commissioning ......................................................................................................................................... 65
10.1 Safety Precauons ........................................................................................................................................... 65
10.2 Filling Process................................................................................................................................................... 65
10.3 Deaeraon Process ..........................................................................................................................................66
11. Post-Installaon Checklist ........................................................................................................................ 68
12. Operaon ................................................................................................................................................. 70
12.1 Start-Up Informaon........................................................................................................................................70
12.2 Control Panel.................................................................................................................................................... 71
12.3 Basic Operaon Sengs .................................................................................................................................. 73
12.4 Parameter Sengs........................................................................................................................................... 84
12.5 Outdoor Reset Control..................................................................................................................................... 89
12.6 DHW Recirculaon Funcon ............................................................................................................................ 94
12.7 Simultaneous CH and DHW Operaon ............................................................................................................98
12.8 Diagnosc Codes............................................................................................................................................ 100
12.9 Forced Hi/Low Fire Modes.............................................................................................................................105
13. Maintenance .......................................................................................................................................... 106
13.1 Owner Maintenance ......................................................................................................................................106
13.2 Licensed Professional Maintenance............................................................................................................... 107
13.3 Test the Ignion Safety Shut O Device ........................................................................................................110
14. Appendices............................................................................................................................................. 111
14.1 Approved Cleaners, Inhibitors and Anfreezes ............................................................................................111
14.2 Flush the CH Plumbing System......................................................................................................................112
14.3 Flush the DHW Heat Exchanger ....................................................................................................................113
14.4 System Applicaon Examples........................................................................................................................114
14.5 Gas Conversion .............................................................................................................................................. 120
14.6 Wiring Diagram ..............................................................................................................................................124
14.7 Ladder Diagram..............................................................................................................................................125
14.8 CH Pressure Drop and Flow Curve ................................................................................................................126
14.9 DHW Pressure Drop and Flow Curve ............................................................................................................ 127
14.10 Guidelines for Addional DHW Controller (Oponal) ................................................................................. 128
14.11 Remove a Boiler from a Common Vent System...........................................................................................130
14.12 Massachuses State Gas Regulaons.......................................................................................................... 131
14.13 Warranty ...................................................................................................................................................... 132

4 Rinnai I-Series Condensing Boiler Combi Manual
Thank you for purchasing a Rinnai Condensing
Boiler. Before installing and operang this
boiler, be sure to read these instrucons
completely and carefully to familiarize
yourself with the boiler’s features and
funconality.
 You must read the enre manual to
properly operate the boiler.
 Keep this manual for future reference.
 As when using any appliance generang
heat, there are certain safety precauons
you should follow. See secon “2.2 Safety
Precauons” for detailed safety
precauons.
 Be sure your boiler is installed by a
licensed installer.
 If installing in the state of Massachuses,
read secon “14.12 Massachuses State
Gas Regulaons” in this manual.
ANSI American Naonal Standards
Instute
Btu Brish Thermal Unit
CH Central Heang
DHW Domesc Hot Water
GPM Gallons per minute
LP Liquid Propane
LWCO Low Water Cut O
NG Natural Gas
PP Polypropylene
PRV Pressure Relief Valve
PSI Pounds per square inch
W.C. Inches water column
For Your Records
Dealer Name:
Located on le
side of unit
1
 A trained and qualied professional
must install the boiler, inspect it, and
leak test it before use. The warranty
will be voided due to any improper
installaon.
 The trained and qualied professional
should have skills such as:
 Gas line sizing
 Connecng gas lines, water lines,
valves, and electricity
 Knowledge of applicable naonal,
state, and local codes
 Installing venng through a wall
or roof
 Training in installaon of
condensing boilers. Training on
Rinnai I-Series Condensing Boilers
is accessible at
www.trainingevents.rinnai.us.
 Read all instrucons in this manual
before installing the boiler. The boiler
must be installed according to the
exact instrucons in this manual.
 Proper installaon is the responsibility
of the installer.
 When installaon is complete, leave
this manual with the boiler or give the
manual directly to the consumer.
Following is a list of common acronyms and
abbreviaons used in this manual:
Dealer Phone:
Purchase Date:
Serial #:

Rinnai I-Series Condensing Boiler Combi Manual 5
Indicates an imminently hazardous
situaon which, if not avoided, will
result in personal injury or death.
Indicates a potenally hazardous
situaon which, if not avoided, could
result in personal injury or death.
Indicates a potenally hazardous situaon
which, if not avoided, could result in minor
or moderate injury. It may also be used to
alert against unsafe pracces.
DANGER
WARNING
This manual contains the following important
safety symbols. Always read and obey all
safety messages.
The following precauons apply to the
installer and consumer. Read and follow all
instrucons in this secon.
 Before operang, smell all around the
appliance area for gas. Be sure to smell
next to the oor because some gas is
heavier than air and will sele on the
oor.
 Keep the area around the appliance
clear and free from combusble
materials, gasoline, and other
ammable vapors and liquids.
 Do not store or use gasoline or other
ammable vapors and liquids in the
vicinity of this or any other appliance.
 Combusble construcon refers to
adjacent walls and ceiling and should
not be confused with combusble or
ammable products and materials.
Combusble and/or ammable
products and materials should never be
stored in the vicinity of this or any gas
appliance.
 Always check the water temperature
before entering a shower or bath.
2
 If the informaon in these instrucons
is not followed exactly, a re or
explosion may result causing property
damage, personal injury, or death.
 Do not store or use gasoline or other
ammable vapors and liquids in the
vicinity of this or any other appliance.
 WHAT TO DO IF YOU SMELL GAS:
 Do not try to light any appliance.
 Do not touch any electrical
switch; do not use any phone in
your building.
 Immediately call your gas
supplier from a neighbor’s
phone. Follow the gas supplier’s
instrucons.
 If you cannot reach your gas
supplier, call the re department.
 Installaon and service must be
performed by a qualied installer,
service agency or the gas supplier.
 The warning signs in this manual are
here to prevent injury to you and
others. Please follow them explicitly.
Safety alert symbol. Alerts you
to potenal hazards that can
kill or hurt you and others.
WARNING
CAUTION

6 Rinnai I-Series Condensing Boiler Combi Manual
WARNING
This product can expose you to
chemicals including lead, lead
compounds and carbon disulde which
are known to the State of California to
cause cancer, birth defects or other
reproducve harm. For more
informaon, visit
www.P65Warnings.ca.gov.
 Flammable liquids such as cleaning
solvents, aerosols, paint thinners,
adhesives, gasoline and propane must be
handled and stored with extreme care.
These ammable liquids emit ammable
vapors and when exposed to an ignion
source can result in a re hazard or
explosion. Flammable liquids should not be
used or stored in the vicinity of this or any
other gas appliance.
 DO NOT operate the boiler without the
front panel installed. The front panel
should only be removed for service/
maintenance or replacing internal
components.
 BURN HAZARD. Hot exhaust and vent may
cause serious burns. Keep away from the
boiler. Keep small children and animals
away from the boiler.
 Heang supply, return and domesc hot
water outlet pipes leaving the boiler can be
hot to touch.
 Install the vent system per local and
naonal codes.
 Do not install this boiler above 10,200 
(3,109 m).
 Do not obstruct combuson air to the
boiler.
 Rinnai recommends that every home have
a carbon monoxide (CO) alarm in the
hallway near bedrooms in each sleeping
area. Check baeries monthly and replace
them annually.
 California law requires the following
Proposion 65 warning to be provided:
 Do not use this appliance if any part has
been under water. Immediately call a
licensed professional to inspect the
appliance and replace any part of the
control system and any manual gas control
valve which has been under water.
 Do not use substute materials. Use only
parts cered for the appliance.
 Should overheang occur or the gas
supply fail to shut o, turn o the manual
gas control valve to the appliance.
 It is strongly recommended that you use a
trained and qualied professional who has
aended a Rinnai installaon training class
to adjust parameter sengs.
 Do not use an extension cord or adapter
plug with this appliance.
 Any alteraon to the appliance or its
controls can be dangerous and will void
the warranty.
 To protect yourself from harm, before
performing maintenance:
 Turn o the electrical power supply by
unplugging the power cord or by
turning o the electricity at the circuit
breaker. (The boiler controller does
not control the electrical power.)
 Turn o the gas at the gas control,
usually located immediately below the
boiler.
 Turn o the incoming water supply.
This can be done at the isolaon valve
immediately below the boiler for the
domesc hot water. Turning o the
water for the central heang system is
done at the boiler system lling staon
shut-o valve or the main water
supply to the building.
 Use only your hand to turn the manual
gas control valve. Never use tools. If
the manual gas control valve will not
turn by hand, do not try to repair it;
call a trained and qualied
professional. Force or aempted
repair may result in a re or explosion.
 Proper venng is required for the safe
operaon of this appliance. Failure to
properly vent this appliance can result in
death, personal injury and/or property
damage.

Rinnai I-Series Condensing Boiler Combi Manual 7
The I-Series Condensing Boiler is a wall-mounted, gas-red boiler designed to providing heang
and domesc hot water.
For complete boiler informaon, refer to the “Rinnai I-Series Condensing Boiler Installaon
Manual” supplied with the boiler, or visit rinnai.us.
Topics in this secon
 Front View
 Boom View
 Components
 Specicaons
 Dimensions
 Accessories
3
Controller
Vent Connecons
Piping Connecons

8 Rinnai I-Series Condensing Boiler Combi Manual
Gas
DHW
Cold Inlet
DHW
Hot Outlet
Central
Heang
Supply
Central
Heang
Return
Supply to CH System
Return from CH System
Primary-Secondary Heang Kit
CH Pressure Relief Valve (supplied
with boiler)
CH Supply
Condensate Drain
Domesc Hot Water
Domesc Cold Water
Gas
CH Return
Domesc Hot Water Pressure Relief Valve
Central Heang Pressure Gauge
Gas Shut O Valve
All items are eld-supplied unless otherwise noted.

Rinnai I-Series Condensing Boiler Combi Manual 9
ExhaustIntake
Air Inlet Filter
Fan with Integrated Venturi
Gas Valve
Heat Exchanger
Silencer
Pressure Sensor
Integrated Pump
Diverter Valve
Burner Assembly
Ignion Unit
PC Board Cover
PC Board Removed
Control Panel
Air Intake Flue Gas Exhaust
Flow Sensor
Air Vent
Plate Heat Exchanger
Water Flow Servo Valve
Bypass Servo Valve
Condensate Trap

10 Rinnai I-Series Condensing Boiler Combi Manual
1 Maximum gas supply pressure must not exceed the value specied by the manufacturer.
Rinnai products are connually being updated and improved; therefore, specicaons are subject to change
without prior noce.
Model i060C i090C i120C
Dimensions - w, h, d 18.5 in. x 26.4 in. x 10.9 in. (471 mm x 671mm x 276 mm)
Weight 73.0 lb (33 kg) 76.1 lb (34.5 kg)
Appliance Type Wall-Mounted, Gas-Fired Combi Boiler
Installaon Type Indoor
Ignion System Direct Electronic Ignion
Heat Exchanger Surface Area 9.3 sq  10.9 sq 
Gas
Consumpon
(Btu/hr)
Minimum 15,000
Maximum (CH) 60,000 90,000 120,000
Maximum (DHW) 160,000 199,000
DHW
Specicaon
Minimum Acvaon Flow Rate 0.4 GPM (1.5 L/min)
Minimum Operaon Flow Rate 0.26 GPM (1.0 L/min)
Maximum Flow Rate 7.9 GPM (30 L/min) 9.8 GPM (37 L/min)
Flow Rate at 70°F (39°C) rise 4.1 GPM (15 L/min) 5.1 GPM (19 L/min)
Temperature
Seng
CH (Minimum - Maximum) 104°F - 180°F (40°C - 82°C)
DHW (Minimum - Maximum) 98°F - 140°F (37°C - 60°C)
Water
Content
CH 0.75 gal 0.75 gal 0.88 gal
DHW 0.05 gal 0.05 gal 0.05 gal
Water
Pressure
CH Minimum: 13 PSI (90 kPa) Maximum: 45 PSI (310 kPa)
Recommended: 17-26 PSI (117-180 kPa)
Pressure Relief Valve for CH
(included with system) 30 PSI (207 kPa)
DHW Minimum: 2 PSI (10 kPa) / Maximum: 150 PSI (1,034 kPa)
(Recommend 10-80 PSI for maximum performance)
Grundfos Pump Model UPS 15-78
Sound Level CH: 42 dB(A)
DHW: 44 dB(A) CH: 42 dB(A) DHW: 47 dB(A)
Electrical Data
Normal (CH) 144 W 158 W 158 W
Normal (DHW) 174 W 174 W 194 W
Standby 4 W
Max Current 6 Amps
Fuse 10 Amps x 2
Gas Supply
Pressure1
Natural Gas 3.5 in. - 10.5 in. W.C. (0.87 - 2.61 kPa)
Propane 8.0 in. - 13.5 in. W.C. (1.99 - 3.36 kPa)
Electric Connecons AC 120 Volts, 60 Hz
Cercaons ANSI Z21.13, CSA 4.9, ASME

Rinnai I-Series Condensing Boiler Combi Manual 11
Measurements: in. (mm)
Vent Connecon: 2 in. (51 mm) nominal PVC/Polypropylene or 3 in./5 in. Concentric

12 Rinnai I-Series Condensing Boiler Combi Manual
Central Heang
Return
Central Heang
Supply
Domesc
Hot Water Gas
Domesc
Cold Water
Condensate
Drain
Connecon Connecon Size
Gas 3/4 in. NPT
DWH In (Cold Inlet) 3/4 in. NPT
DHW Out (Hot Outlet) 3/4 in. NPT
CH In (CH Return) 1 in. NPT
CH Out (CH Supply) 1 in. NPT
Condensate Outlet 1/2 in. NPT

Rinnai I-Series Condensing Boiler Combi Manual 13
The following oponal accessories are available for the Rinnai I-Series Condensing Boiler.
CONDENSATE NEUTRALIZER
Neutralizes the condensate
generated by the boiler.
SCALECUTTER
Filters and reduces the amount of
scale entering the boiler allowing
for greater boiler longevity.
SCALECUTTER REFILL CARTRIDGE
Rell cartridge for the ScaleCuer
lter assembly.
ISOLATION VALVE KIT
For quick isolaon of the
boiler DHW connecons.
PRIMARY-SECONDARY HEATING KIT MC-601 CONTROLLER

14 Rinnai I-Series Condensing Boiler Combi Manual
 Installaon Guidelines
 What You’ll Need
 Items Included
 Choose an Installaon Locaon
 Mount the Boiler to the Wall
 Fill the Condensate Collector
THIS SECTION IS INTENDED
FOR THE INSTALLER
Installer qualicaons: A trained and qualied
professional must install the appliance,
inspect it, and leak test the boiler before use.
The warranty will be voided due to any
improper installaon. The trained and
qualied professional should have skills such
as: Gas sizing; Connecng gas lines, water
lines, valves, and electricity; Knowledge of
applicable naonal, state, and local codes;
Installing venng through a wall or roof; and
training in installaon of condensing boilers.
Training for Rinnai Condensing Boilers is
accessible online at
www.trainingevents.rinnai.us.
Topics in this secon
4
 This boiler is cered for installaon in
residenal and commercial applicaons.
 This boiler is suitable for combinaon
water heang and central heang.
 The installaon must conform with local
codes or, in the absence of local codes,
with the Naonal Fuel Gas Code, ANSI
Z223.1/NFPA 54, or the Natural Gas and
Propane Installaon Code, CSA B149.1. If
installed in a manufactured home, the
installaon must conform with the
Manufactured Home Construcon and
Safety Standard, Title 24 CFR, Part 3280
and/or CAN/SCA Z240 MH Series, Mobile
Homes.
 The appliance, when installed, must be
electrically grounded in accordance with
local codes or, in the absence of local
codes, with the Naonal Electrical Code,
ANSI/NFPA 70, or the Canadian Electrical
Code, CSA C22.1.
 The appliance and its main gas valve
must be disconnected from the gas
supply piping system during any
pressure tesng of that system at test
pressures in excess of 1/2 psi (3.5 kPa)
(13.84 in W.C.). For system tesng at
pressures less than or equal to 1/2 psi
(3.5 kPa) (13.84 in W.C.) the appliance
must be isolated from the gas supply
piping by closing its individual manual
shuto valve.
 You must follow the installaon
instrucons and those in secon
“5. Venng” for adequate combuson
air and exhaust.
 If this boiler’s DHW system is connected
to a closed water supply system, such as
one having a backow preventer in the
cold water supply line, means shall be
provided to control thermal expansion.
Contact the water supplier or local
plumbing inspector on how to control
thermal expansion.
 Should overheang occur or the gas
supply fail to shut o, turn o the
manual gas control valve to the
appliance.
 Combuson air must be free of
chemicals, such as chlorine or bleach,
that produce fumes. These fumes can
damage components and reduce the life
of your appliance.
 Where required by the authority having
jurisdicon, the installaon must comply
with the Standard for Controls and
Safety Devices for Automacally Fired
Boilers, ANSI/ASME CSD-1.

Rinnai I-Series Condensing Boiler Combi Manual 15
DO NOT install the boiler in an area
where water leakage of the unit or
connecons will result in damage to
the area adjacent to the appliance
or to lower oors of the structure.
When such locaons cannot be
avoided, it is required that a
suitable drain pan, adequately
drained, be installed under the
boiler. The pan must not restrict
combuson air ow.
DO NOT install the boiler in an area
with negave air pressure.
DO NOT obstruct the ow of
combuson and venlaon air.
DO NOT use substute parts that
are not authorized for this boiler.
DO NOT install the boiler on
carpeng.
DO NOT
Gather the recommended tools and parts
before starng installaon.
Items Needed
 Pressure relief valve for domesc
hot water (150 PSI / 1,034 kPa)
 Pressure/Temperature Gauge
Note: When aaching the
pressure/temperature gauge,
please comply with applicable codes
and the ASME standard.
 Low loss header or closely spaced
tee
 Expansion tank for a closed heang
system
 Isolaon valve kit or equivalent
components (for quick isolaon of
the boiler for service and/or
maintenance)
 Air separator
 Standard tools for central heang,
gas ng, plumbing and electrical
wiring.
 Digital manometer capable of
reading both posive and negave
pressure
 Digital mulmeter capable of
reading microamps
 pH digital meter or test strips
 For wall mounng bracket
installaon:
 Level
 Screws (use appropriate screws
for type of wall construcon)
Other Items You May Need
 Combuson analyzer (intended for
use with condensing boilers)
 Hand truck with fastening belt
 Ensure the wall is of sucient
strength to support the weight of the
boiler, piping and any other
components needed for installaon;
if it is not, please reinforce the wall as
appropriate.
 Operang limits of the boiler:
Maximum boiler set
point temperature:
180°F (82 °C)
Maximum operang
pressure:
45 psi (3.1 bar)
Maximum allowable
working
temperature ASME:
210°F (99°C)
Maximum allowable
working pressure
ASME:
45 psi (3.1 bar)

16 Rinnai I-Series Condensing Boiler Combi Manual
Carefully unpack your boiler system and verify the following contents are included. If any items are
damaged or missing, contact your local dealer/distributor. Do not aempt to use any item that
appears damaged.
 Installaon and Operaon Manual (this manual)
 User Manual
Vent top with integrated
2 in. PVC and
3 in. X 5 in. Concentric
Vent Adapter
RINNAI CONDENSING BOILER
Pump
Air
Supply
Filter
Integrated
Items
Refer to secon
“3.3 Components”
for a complete list of
integrated parts.
WALL MOUNTING BRACKET PRESSURE RELIEF VALVE
For Central Heang Systems
OUTDOOR TEMPERATURE
SENSOR
VENT SCREENS
Vent screens (x2) and vent
screen screws (x2). The vent
screen prevents debris and
other objects from entering the
terminal. One vent screen is for
the intake; the other is for the
exhaust.
LIQUID PROPANE FIELD CONVERSION KIT
This boiler is congured for Natural Gas only. Use this kit to
convert to Propane Gas if needed. Contents include:
Orice Outer Gasket Inner Gasket Conversion Rang Plate
DOCUMENTATION

Rinnai I-Series Condensing Boiler Combi Manual 17
Contaminant Maximum Level
Total Hardness Up to 200 mg/L
Aluminum * Up to 0.2 mg/L
Chlorides * Up to 250 mg/L
Copper * Up to 1.0 mg/L
Dissolved Carbon Dioxide (CO2) Up to 15.0 mg/L
Iron * Up to 0.3 mg/L
Manganese * Up to 0.05 mg/L
pH * 6.5 to 8.5
TDS (Total Dissolved Solids) * Up to 500 mg/L
Zinc * Up to 5 mg/L
Consideraon of care for your boiler should
include evaluaon of water quality.
 The water must be potable, free of
corrosive chemicals, sand, dirt, or other
contaminants.
 It is up to the installer to ensure the
water does not contain corrosive
chemicals or elements that can aect or
damage the boiler.
 Water that contains chemicals
exceeding the levels below can damage
the boiler.
* Source: Part 143 Naonal Secondary Drinking Water Regulaons
When choosing an installaon locaon, you
must ensure that clearances will be met and
that the vent length will be within required
limits. Consider the installaon
environment, water quality, and need for
freeze protecon. Requirements for the gas
line, water lines, electrical connecon, and
condensate disposal can be found in their
respecve installaon secons in this
manual.
This secon provides informaon on the
importance of water quality to the Rinnai
Condensing Boiler. The informaon is
intended to serve as general guidelines only
and is not a complete list of water quality
guidelines.
 Unsuitable heang system water can cause
the formaon of scale or sludge, which
aects system eciency. It can also cause
corrosion and reduce life of the heat
exchanger.
 Never use water that has been treated by a
reverse osmosis, deionized, or dislled
water to soen the water to ll the heang
system.
 For Domesc Hot Water systems, if you
install the boiler in an area that is known to
have hard water or that causes scale build-
up, the water must be treated and may
require a more frequent ushing schedule.
Scale build-up is caused by hard water and
can be accelerated if the boiler is set at a
high temperature. Rinnai oers
Southeastern Filtraon’s “ScaleCuer Water
Condioning System” that oers superior
lime scale prevenon and corrosion control
by feeding a blend of control compounds
into the cold water supply.
 Oxygen permeable or rubber tubing is not
permied in the heang system unless it is
separated from the boiler by a plate heat
exchanger.
 Thoroughly ush the system prior to lling.
While ushing, isolate the boiler.
 Do not introduce any system cleaner into
the boiler. Flush the system thoroughly to
remove all system cleaner before lling the
boiler with water.
 When freeze protecon of the heang
system is desired, only use Rinnai-approved
anfreezes. The allowed maximum
concentraon is 40%.
 Reference secon “14.1 Approved Cleaners,
Inhibitors and Anfreezes” in the Appendix
for an approved list of system cleaners,
inhibitors, and anfreezes.
IMPORTANT
Replacement of components due to
water quality damage is not covered by
the warranty.

18 Rinnai I-Series Condensing Boiler Combi Manual
Use this checklist to ensure you have selected the correct locaon for the boiler.
Air surrounding the boiler, venng, and vent terminaon(s) is used for combuson and must be
free of any compounds that cause corrosion of internal components. These include corrosive
compounds that are found in aerosol sprays, detergents, bleaches, cleaning solvents, oil based
paints/varnishes, and refrigerants. The air in beauty shops, dry cleaning stores, photo processing
labs, and storage areas for pool supplies oen contains these compounds. The boiler, venng, and
vent terminaon(s) should not be installed in any areas where the air may contain these corrosive
compounds.
Locaon Clearance
Top 2 in. (51 mm)
0 in. from vent components
Boom (Ground) 12 in. (305 mm)
Front 6 in. (152 mm)
Clearance for servicing is
24 in. (610 mm) in front
of boiler
Back 0 in.
Sides (Le and Right) 2 in. (51 mm)
Vent 0 in.
□The boiler is not exposed to corrosive compounds in the air.
□The boiler locaon complies with the required clearances.
□The planned combuson air and exhaust terminaon locaons meet the required clearances.
□The water supply does not contain chemicals or exceed total hardness that will damage the
heat exchanger.
□A standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet or other 120 VAC, 60 Hz
source is available.
□The installaon must conform with local codes or, in the absence of local codes, with the
Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installaon
Code, CSA B149.1.
Top
Boom
WALL
Front
2 in. (51 mm)
Minimum
12 in. (305 mm)
Minimum
2 in. (51 mm)
Minimum
Right image is not to scale and is for illustraon
purposes only.
Side

Rinnai I-Series Condensing Boiler Combi Manual 19
Supplied by Installer:
 Level
 Four screws for mounng bracket
installaon
 Screws for top and boom bracket
installaon
Use appropriate screws for type of
wall construcon.
Hold the wall mounng bracket up
against the wall and use a level to
make sure the bracket is even. Proper
operaon requires the boiler to be
level.
Use four screws to secure the wall
mounng bracket to the wall (two
screws on far le side and two
screws on far right side).
Use the appropriate screws for the
wall construcon to secure the
mounng bracket to the wall
between two studs.
You Will Need:
 Rinnai Condensing Boiler
 Wall Mounng Bracket
Level
Wall Mounng Bracket
Insert the top bracket into the wall
mounng bracket. Make sure the wall
mounng bracket is aached to the wall
and can hold the weight of the boiler
before you fully let go.
Boiler
Right Side
Steps connued on next page.
Instrucons:

20 Rinnai I-Series Condensing Boiler Combi Manual
Securely screw the top and boom
brackets into the wall, making sure
the screws are ush with the wall.
 Use any of the holes in the top
and boom brackets.
 Make sure the securing method is
sucient to support the weight of
the boiler. Refer to the boiler
weight in secon “3.4
Specicaons” of this manual.
Top
Bracket
Boom
Bracket
The boiler must be installed in an
upright and level posion. Do not
install the boiler upside down or on
its side.
IMPORTANT
The condensate collector must be lled with
water prior to installing the vent system.
Pour approximately 10 ounces (1.25 cups) of
water directly into the boiler’s exhaust port
(do not remove the 2 in. PVC adapter prior to
this).
Before operaon of the boiler, the
condensate collector must be lled with
water. This is to prevent the potenal of
exhaust gasses from entering the building.
Failure to ll the condensate collector could
result in severe personal injury or death.
Exhaust
Port
WARNING