Rinnai c199i User manual







 
 
 
 



WARNING

This manual provides informaon on the installaon, operaon, and maintenance of the water heater. For proper
operaon and , it is important to follow the instrucons and adhere to the safety precauons.
A licensed professional must install the water heater according to the exact instrucons in this manual.
The consumer must read the enre manual to properly operate the water heater and to have regular maintenance
performed.
FOR INDOOR APPLICATIONS ONLY
C199i .................... --
FOR OUTDOOR APPLICATIONS ONLY
C199e.................... --




CUS
U306-1971(00)

2C199 Manual
Table of Contents
This is the safety alert symbol. This symbol alerts you to potenal hazards that can kill or hurt you
and others.
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
CAUTION
WARNING
Table of Contents ..................................................... 2
Safety Behaviors and Pracces for the
Consumer and Installer ............................................ 3
Installaon Instrucons
(for the licensed professional) ............................. 4
Prepare for Installaon......................................5
Determine Installaon Locaon ........................6
Combuson Air Requirements (Common Vent
Applicaons Only)..............................................7
Freeze Protecon.............................................13
Checklist to Determine Installaon Locaon...14
Mount to Wall..................................................14
Installaon of Venng (indoor models only) ...15
Venng Guidelines and Conguraons ......16-22
Twin Pipe PVC/CPVC Vent Installaon........23-40
Condensate (indoor models only)....................41
Checklist for Venng and Condensate
(indoor models only)........................................41
Installaon of Plumbing...................................42
Checklist for Plumbing .....................................45
Installaon of Gas Supply ................................45
Connect Electricity ...........................................47
Adjustment for High Altude Installaons ......47
Adjustment for Vent Length
(indoor models only) ..............................................47
Checklist for Gas and Electricity.......................47
Installaon of Temperature Controller............48
Final Checklist...................................................50
Technical Data ........................................................51
Specicaons ...................................................51
Dimensions.......................................................52
Pressure Drop and Water Flow Curves ............53
Ladder Diagram................................................54
Operaon Instrucons .......................................55
Consumer Operaon Guidelines for the
Safe Operaon of your Water Heater ....................56
How to Use the Temperature Controller ...............57
How to Set the Temperature..................................58
Diagnosc Codes ....................................................60
Required Maintenance...........................................63
Freeze Protecon and Winterizaon ...............64
Flushing the Heat Exchanger............................65
Manual Draining of the Water Heater.............66
State Regulaons....................................................67
Replacement Parts .................................................68
Warranty.................................................................69
French Version........................................................72
Important Safety Informaon
Safety Denions
NOTICE: Rinnai somemes shares customer contact informaon with businesses that we believe provide
products or services that may be useful to you. By providing this informaon, you agree that we can
share your contact informaon for this purpose. If you prefer not to have your informaon shared with
these businesses, please contact customer service and ask not to have your informaon shared. We
will however, connue to contact you with informaon relevant to the product(s) you registered and/
or your account with us.
If you have any quesons or feel that the manual is incomplete contact Rinnai at 1-800-621-9419.

C199 Manual 3
CAUTION
 BURN HAZARD. Hot exhaust and vent may cause
serious burns. Keep away from the water heater
unit. Keep small children and animals away from
the unit.
 Hot water outlet pipes leaving the unit can be hot
to touch.
Safety Behaviors and Pracces for the Consumer and Installer
 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.
 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.
 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
temperature controller does not control the
electrical power.)
 Turn o the gas at the manual gas valve, usually
located immediately below the water heater.
 Turn o the incoming water supply. This can be
done at the isolaon valve immediately below
the water heater or by turning o the water
supply to the building.
WARNING
 Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will not
push in or turn by hand, do not try to repair it; call a
licensed professional. Force or aempted repair
may result in a re or explosion.
 Do not use this appliance if any part has been under
water. Immediately call a licensed professional to
inspect the appliance and to replace any part of the
control system and any gas control 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.
 Do not adjust the DIP switch unless specically
instructed to do so.
 Do not use an extension cord or an adapter plug
with this appliance.
 Any alteraon to the appliance or its controls can be
dangerous and will void the warranty.
 Proper venng is required for the safe operaon of
this appliance.
California law requires this noce to be provided:
California Proposion 65:
This product contains chemicals known to the state of California to cause cancer, birth defects, or other
reproducve harm.
WARNING

4 C199 Manual
A licensed professional must install the appliance,
inspect it, and leak test it before use. The warranty
will be voided due to any improper installaon.
The installer 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.
 Training in installaon of tankless water heaters.
(Training can be accessed on-line at
www.trainingevents.rinnai.us)

Prepare for Installaon ......................................5
Determine Installaon Locaon.........................6
Freeze Protecon.............................................13
Checklist to Determine Installaon Locaon...14
Mount to Wall..................................................14
Remove the Front Panel ..................................14
Installaon of Venng (indoor models only) ...15
Condensate (indoor models only)....................41
Checklist for Venng and Condensate
(indoor models only)........................................41
Installaon of Plumbing ...................................42
Checklist for Plumbing .....................................45
Installaon of Gas Supply.................................45
Connect Electricity ...........................................47
Adjustment for High Altude Installaons ......47
Adjustment for Vent Length
(indoor models only)........................................47
Checklist for Gas and Electricity.......................47
Installaon of Temperature Controller............48
Final Checklist...................................................50


 Do not install the C199i outdoors.
 Do not install the C199e indoors.
 Do not install the appliance 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 recommended that a
suitable drain pan, adequately drained, be installed
under the appliance. The pan must not restrict
combuson air ow.
 Do not obstruct the ow of combuson and
venlaon air. Combuson air shall not be
supplied from occupied spaces.
 Do not use this appliance in an applicaon such as
a pool or spa heater that uses chemically treated
water . (This appliance is suitable for lling large or
whirlpool spa tubs with potable water.)
 Do not use substute parts that are not authorized
for this appliance.

 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.
 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 appliance 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.).
 The appliance must be isolated from the gas supply
piping system by closing its individual manual
shuto valve during any pressure tesng of the gas
supply piping system at test pressures equal to or
less than 1/2 psi (3.5 kPa) (13.84 in W.C.).

 For installaon in commercial applicaons only.



C199 Manual 5

Parts included
Tools needed
Materials needed
 You must follow the installaon instrucons and
those in Care and Maintenance for adequate
combuson air intake and exhaust.

 If a water heater is installed in 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.
 Keep the air intake locaon free of chemicals, such
as chlorine or bleach, that produce fumes. These
fumes can damage components and reduce the life
of your appliance.
 Tankless water heater
 Color coded cold (blue) and hot (red) isolaon
valves
 Pressure relief valve
 MC-91-2 temperature controller (integrated into
indoor models; provided with outdoor models)
 Self Tapping Screws (Qty - 2)
 Pipe wrenches (2)
 Adjustable pliers
 Screwdrivers (2)
 Wire cuers
 Gloves
 Safety glasses
 Level
Tools that might be needed
 Hammer drill with
concrete bits
 Saw
 Threading machine with
heads and oiler
 Core drill with diamond
head
 Torch set
 Copper tubing cuer
 Steel pipe cuer
Materials that may be needed
 Soap or gas leak
detector soluon
 Approved venng
 Teon tape
(recommended) or pipe
compound
 Pipe insulaon
 Heat tape
 Electrical wire and
conduit per local code
 Concrete wall anchors
 Oponal pipe cover
 PVC glue/cement
 5/8” ID PVC exible
tubing
 2 conductor 22 AWG
wire for controller
 Single gang electrical
box
 Wire nuts
 Unions and drain valves


6 C199 Manual
Consideraon of care for your water heater should
include evaluaon of water quality.









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 or PPM
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

Environment
Air surrounding the water heater, 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. Therefore it
is recommended that outdoor models be used for these
locaons where possible.
The water heater, venng, and vent terminaon(s)
should not be installed in any areas where the air may
contain these corrosive compounds. If it is necessary for
a water heater to be located in areas that may contain
corrosive compounds, the following instrucons are
strongly recommended.

Indoor/Internal Water Heaters
 DO NOT Install in areas where air for combuson
might be contaminated with chemicals.
 Before installaon, consider where air has the
ability to travel within the building to the water
heater.
 Where possible, install the water heater in a sealed
closet so that it is protected from the potenal of
contaminated indoor air.
 Chemicals that are corrosive in nature should not
be stored or used near the water heater.
Outdoor/External Water Heaters and Vent
Terminaons of Indoor/Internal Water Heaters
 Install the water heater as far away as possible
from exhaust vent hoods.
 Install as far away as possible from any air inlet
vents. Corrosive fumes may be released through
these vents when air is not being brought in
through them.
 Chemicals that are corrosive in nature should not
be stored or used near the water heater or vent
terminaon.
Damage and repair due to corrosive compounds in the
air is not covered by warranty.
Water Quality
* Source: Part 143 Naonal Secondary Drinking Water Regulaons
If you install this water heater in an area that is known
to have hard water or that causes scale build-up, the
water must be treated and may require more frequent
heat exchanger ushing schedule.
When scale build-up in the heat exchanger begins to
aect the performance of the water heater, a diagnosc
code “LC#” will display. Flush the heat exchanger to
prevent damage to it. Scale build up is caused by hard
water and can be accelerated if the unit 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.
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 of this manual.
Part Number Descripon
103000038 Southeastern Filtratrion
ScaleCuer System 3/4” Feed
103000039 ScaleCuer Rell

C199 Manual 7
Common Vent Applicaons Only
Common Vent Applicaons Ulizing Room Air
Room air can be used only in applicaons that ulizes the approved Rinnai common vent method. (Refer to
Rinnai Common Vent manual for further details)
Combuson
Air Intake
Exhaust
(Concentric)
Concentric venng requires
air intake cap to remain
installed.
Combuson
Air Intake
Exhaust
(PVC/CPVC)
Two pipe venng requires air
intake cap to be removed to
accommodate air intake pipe.
Combuson Air Requirements
This water heater requires adequate combuson air for venlaon and diluon of ue gases. Failure to provide
adequate combuson air can result in unit failure, re, explosion, serious bodily injury or death. Use the follow-
ing methods to ensure adequate combuson air is available for correct and safe operaon of this water heater.
Important: Combuson air must be free of corrosive chemicals. Do not provide combuson air from
corrosive environments. Appliance failure due to corrosive air is not covered by warranty.
Combuson air must be free of acid forming chemical such as sulfur, uorine and chlorine. These chemicals have
been found to cause rapid damage and decay and can become toxic when used as combuson air in gas appli-
ances. Such chemicals can be found in, but not limited to bleach, ammonia, cat lier, aerosol sprays, cleaning
solvents, varnish, paint and air fresheners. Do not store these products or similar products in the vicinity of this
water heater.
Common Vent Room Air
Appliance Adapter

8 C199 Manual
Unconned Space:
An unconned space is dened in Naonal Fuel Gas
Code, ANSI Z223.1/NFPA 54 as “a space whose vol-
ume is not less than 50 cubic feet per 1000 Btu/hr
(4.8 m3 per kW per hour) of the aggregate input
rang of all appliances installed in that space. Rooms
communicang directly with the space in which the
appliances are installed, through openings not fur-
nished with doors, are considered a part of the un-
conned space.” If the “unconned space” containing
the appliance(s) is in a building with ght construc-
on, addional outside air may be required for proper
operaon. Outside air openings should be sized the
same as for a conned space.
Conned Space:
(Small Room, Closet, Alcove, Ulity Room, Etc.)
A conned space is dened in the Naonal Fuel Gas
Code, ANSI Z223.1/NFPA 54 as "a space whose vol-
ume is less than 50 cubic feet per 1000 Btu/hr (4.8 m3
per kW per hour) of the aggregate input rang of all
appliances installed in that space." A conned space
must have two combuson air openings. Size the
combuson air openings based on the BTU input for
all gas ulizaon equipment in the space and the
method by which combuson air is supplied:
Louvers and Grills
When sizing the permanent opening consideraon
must be taken for the design of the louvers or grills to
maintain the required free area required for all gas
ulizing equipment in the space. If the free area of
the louver or grill design is not available, assume
wood louvers will have 25% free area and metal
louvers or grills will have 75% free area. Under no
circumstance should the louver, grill or screen have
openings smaller than 1/4”.
Example:
Wood: 10 in x 12 in x 0.25 = 30 in2
Metal: 10 in x 12 in x 0.75 = 90 in2
Combuson Air Requirements (Common Vent Applicaons Only)
Locaon
To maintain proper circulaon of combuson air two
permanent openings (one upper, one lower) must be
posioned in conned spaces. The upper shall be
within 12 inches of the top of the conned space and
the lower opening shall be within 12 inches of the
boom of the conned space. Openings must be
posioned as to never be obstructed.
Using Outdoor Air For Combuson
Outdoor air can be provided to a conned space
through two permanent openings, one commencing
within 12 in. (300mm) of the top and one commenc-
ing within 12” (300mm) of the boom, of the con-
ned space. The openings shall communicate to the
outside by one of two ways:
Exhaust
Vent terminaon per ANSI Z223.1/NFPA 54.
For clearances not specied in ANSI Z223.1/
NFPA 54, clearances are in accordance with
local installaon codes and the require-
ments of the gas supplier.
(Be sure to also maintain 12” above grade or
ancipated snow level)

C199 Manual 9
Combuson Air Requirements (Common Vent Applicaons Only)
Combuson air provided to the appliance should
not be taken from any area of the structure that
may produce a negave pressure (i.e. exhaust fans,
powered venlaon fans).
NOTICE
Using Indoor Air For Combuson
When using air from other room(s) in the building,
the total volume of the room(s) must be of adequate
volume (Greater than 50 cubic feet per 1000 Btu/hr).
Each Combuson air opening must have at least one
square inch of free area for each 1000 Btuh, but not
less than 100 square inches each.
When communicang directly with the outdoors
through horizontal ducts, each opening shall have a
minimum free area of 1 in2/2000 Btu/hr (1100 mm2/
kW) of total input rang of all appliances in the
conned space.
Note: If ducts are used, the cross seconal area of the
duct must be greater than or equal to the required
free area of the openings to which they are
connected.
When communicang indirectly with the outdoors
through vercal ducts, each opening shall have a
minimum free area of 1 in2/4000 Btu/hr (550 mm2/
kW) of total input rang of all appliances in the
conned space. Combuson air to the appliance can
be provided from a well venlated ac or crawl
space.
WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH
DUE TO ASPHYXIATION,
COMMON VENTING WITH OTHER MANUFACTURER’S
INDUCED DRAFT APPLIANCES IS NOT ALLOWED.
□Verify proper clearances around the vents .
□Ensure that the Combuson Air Requirements are
followed that will provide sucient combuson
air for the appliance.
□Ensure approved venng components have been
used.
□All horizontal vent runs must be sloped up away
from the water heater a minimum of 1/4 “ (6 mm)
per foot.
□Verify that there is adequate combuson air.
□Ensure that room air is only ulized in common
vented applicaons.
□Ensure if installed in common vent applicaon
ulizing room air that exhaust is terminang
vercally only. (Reference Common Vent manual
for further details.)
□Installaon complies with Naonal Fuel Gas
Code, ANSI Z223.1/NFPA 54 as well as local and
state regulaons therein.
Checklist for Combuson Air and
Venng Requirements
Exhaust
(Be sure to also maintain 12” above grade or
ancipated snow level)
Vent terminaon per ANSI Z223.1/NFPA 54.
For clearances not specied in ANSI Z223.1/
NFPA 54, clearances are in accordance with
local installaon codes and the require-
ments of the gas supplier.

10 C199 Manual
INSIDE
CORNERDETAIL
FIXED
CLOSED
OPERABLE
FIXED
CLOSED
OPERABLE
B
B
B
A
J
BM
C
F
B
B
E
D
L
G
A
H
K
I
[1] A vent shall not terminate directly above a sidewalk or paved driveway
that is located between two single family dwellings and serves both
dwellings.
[2] Permied only if veranda, porch, deck, or balcony is fully open on a
minimum of two sides beneath the oor.
 For clearances not specied in ANSI Z223.1/NFPA 54, clearances are in
accordance with local installaon codes and the requirements of the gas
supplier.
Clearance to opposite wall is 24 inches (60 cm).
X
V
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
For indoor models, you must install a vent terminaon to bring in combuson air and expel exhaust to the outside.
SNOW
TERMINATION
Clearance in
Ref. A also
applies to
anticipated
snow line
   
AClearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm) 12 inches (30 cm)
BClearance to window or door that may be opened 36 inches (91 cm) 12 inches (30 cm)
CClearance to permanently closed window **
D
Vercal clearance to venlated sot, located above the terminal within
a horizontal distance of 2 feet (61 cm) from the center line of the
terminal
**
EClearance to unvenlated sot **
FClearance to outside corner **
GClearance to inside corner **
HClearance to each side of center line extended above meter/regulator
assembly
3 feet (91 cm) within a height 15
feet (4.5 m) above the meter/ *
IClearance to service regulator vent outlet 36 inches (91 cm) *
JClearance to nonmechanical air supply inlet to building or the
combuson air inlet to any other appliance 36 inches (91 cm) 12 inches (30 cm)
KClearance to a mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if within 10
LClearance above paved sidewalk or paved driveway located on public
property 7 feet (2.13 m) *
MClearance under veranda, porch, deck, or balcony 12 inches (30 cm)  *
Direct Vent Terminal Clearances (Indoor Units)

C199 Manual 11
Other Than Direct Vent Terminal Clearances (Outdoor Units)
INSIDE
CORNERDETAIL
FIXED
CLOSED
OPERABLE
FIXED
CLOSED
OPERABLE
B
B
B
A
J
BM
C
F
B
B
E
D
L
G
A
H
K
I
[1] A vent shall not terminate directly above a sidewalk or paved driveway
that is located between two single family dwellings and serves both
dwellings.
[2] Permied only if veranda, porch, deck, or balcony is fully open on a
minimum of two sides beneath the oor.
 For clearances not specied in ANSI Z223.1/NFPA 54, clearances are in
accordance with local installaon codes and the requirements of the gas
supplier.
Clearance to opposite wall is 24 inches (60 cm).
X
V
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
   
AClearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm) 12 inches (30 cm)
BClearance to window or door that may be opened
6 in (15 cm) for appliances ≤ 10,000 Btuh (3
kW), 12 in (30 cm) for appliances > 10,000
Btuh (3 kW) and ≤ 100,000 Btuh (30 kW), 36 in
(91 cm) for appliances >100,000 Btuh (30 kW)
4  (1.2 m) below or to side of opening;
1  (300 mm) above opening
CClearance to permanently closed window **
DVercal clearance to venlated sot, located above the terminal within a
horizontal distance of 2 feet (61 cm) from the center line of the terminal **
EClearance to unvenlated sot **
FClearance to outside corner **
GClearance to inside corner **
HClearance to each side of center line extended above meter/regulator
assembly
3 feet (91 cm) within a height 15 feet (4.5 m)
above the meter/regulator assembly *
IClearance to service regulator vent outlet 36 inches (91 cm) *
JClearance to non-mechanical air supply inlet to building or the combuson
air inlet to any other appliance
6 in (15 cm) for appliances ≤ 10,000 Btuh (3
kW), 12 in (30 cm) for appliances > 10,000
Btuh (3 kW) and ≤ 100,000 Btuh (30 kW), 36 in
(91 cm) for appliances >100,000 Btuh (30 kW)
4  (1.2 m) below or to side of opening;
1  (300 mm) above opening
KClearance to a mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if within 10 feet (3
m) horizontally
LClearance above paved sidewalk or paved driveway located on public 7 feet (2.13 m) *
MClearance under veranda, porch, deck, or balcony 12 inches (30 cm)  *
Clearance in
Ref. A also
applies to
ancipated
snow line

12 C199 Manual
Addional clearances
Check to determine whether local codes supersede
these clearances.
 Avoid terminaon locaons near a dryer vent.
 Avoid terminaon locaons near commercial
cooking exhaust.
 Avoid terminaon locaons near any air inlets.
 You must install a vent terminaon at least 12
inches above the ground or ancipated snow
level.
(0.30 m) between
terminals at same
level
(1.52 m)
vercally
between
terminals
2"
12"
60"
36"
60"
V
V
(1.52 m)
between
terminals at
dierent levels
24"
V
(0.61 m) to wall or parapet
12"
V V
V
60"
V
C199e
C199i
12"
12"
36"
INSIDE
CORNER
V V
(0.30 m) between
terminals at same
level
(0.30 m ) to
an inside
corner
(0.91 m) to venlated
or unvenlated sot
or eve vent; or to a
deck or porch
(1.52 m) vercally
between terminals
(50 mm) between
terminals at same level
(0.30 m) to an
inside corner
The vent for this appliance shall not terminate
 Over public walkways; or
 Near sot vents or crawl space vents or other
area where condensate or vapor could create a
nuisance or hazard or cause property damage; or
 Where condensate or vapor could cause damage
or could be detrimental to the operaon of
regulators, relief valves, or other equipment.
for locang vent
terminaon under a sot (venlated or unvenlated
or eave vent; or to a deck or porch)
 Do not install vent terminaon under a sot vent
such that exhaust can enter the sot vent
 Install vent terminaon such that exhaust and rising moisture
will not collect under eaves. Discoloraon to the exterior of
the building could occur if installed too close.
 Do not install the vent terminaon too close under the sot
where it could present recirculaon of exhaust gases back
into the combuson air intake part of the terminaon.

C199 Manual 13
Unit clearances




-


 6 * (152) 2 *(51)
 0 (zero) 0 (zero)
 6 (152) 6 (152)
 2 (51) 1/2 (13)
 12 (305) 12 (305)
 0 (zero) 0 (zero)
* 0 inches from vent components and condensate drain
line.
The clearance for servicing is 24 inches in front of the
water heater.
For closet installaon, clearance is 6 inches (152 mm from
the front of the water heater.




-


 12 (305) 2 (51)
 0 (zero) 0 (zero)
 24 (610) 0 (zero)
 24 (610) 24 (610)
 6 (152) 1/8 (3.2)
 12 (305) 2 (51)
The clearance for servicing is 24 inches in front of the
water heater.
to side
to front
to top
to floor/ground
Freeze Protecon
Make sure that in case of freezing weather the water
heater and its water lines are protected to prevent
freezing. Damage due to freezing is not covered by
the warranty.
With electrical power and gas supplied, the water
heater will not freeze when the outside air
temperature is as cold as –22°F (-30°C) for indoor
models or is as cold as –4°F (-20°C) for outdoor
models, when protected from direct wind exposure.
Because of the “wind-chill” eect, any wind or
circulaon of the air on the unit will reduce its ability
to protect itself from freezing.
In the event of a power failure and/or gas
interrupon at temperatures below freezing the
water heater should be drained of all water to
prevent freezing damage. In addion, drain the
condensate trap and drain line.
Loss of freeze protecon may result in water damage
from a burst heat exchanger or water lines.
The unit may be drained manually. However, it is
highly recommended to:
drain down solenoid valves be purchased and
installed that will automacally drain the unit if
power is lost. These are available in a kit,
104000059. (The condensate trap is not aected
by the auto drain down solenoid valves and will
have to be manually drained.)
a surge protector with terminals be purchased
and installed which allows the solenoid valves to
operate if the unit is disabled due to a diagnosc
code. This is available as 104000057.
In addion, the solenoid valves should be connected
electrically to a surge protector with terminals. This
allows the solenoid valves to operate if the water
heater is disabled due to a diagnosc code.
The freeze protecon features will not prevent the
external piping from freezing. It is recommended that
hot and cold water pipes be insulated. Pipe cover
enclosures may be packed with insulaon for added
freeze protecon.

14 C199 Manual

wall installaon
brackets
1. Idenfy the installaon locaon and conrm that
the installaon will meet all required clearances.
2. Securely aach the water heater to the wall
using any of the holes in the wall installaon
brackets which are at the top and boom of the
water heater. Ensure that the aachment
strength is sucient to support the weight.
Refer to the weight of the water heater in the
Specicaons secon.
Use a leveling tool to ensure that the water
heater is level. Proper operaon requires that
the water heater be level.
NOTE: The water heater must be installed in an
upright posion. Do not install upside down or on its
side.


□The water heater is not exposed to corrosive
compounds in the air.
□The water heater locaon complies with the
clearances.
□For indoor models, the planned venng will not
exceed the maximum length for the number of
elbows used.
□The planned venng terminaon/air intake
locaon meets the clearances.
□Indoor air is not being used for combuson unless
installed in common vent applicaon.
□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 (for indoor models) 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.
□


 
Slide the plasc trim pieces on each side of the water
heater to expose the screws.
Remove the 4 screws and pull o the front panel.

C199 Manual 15

Install the correct venng for your model according to the venng manufacturer’s instrucons and the guidelines
below. Refer to the vent manufacturer’s technical literature for specic part numbers and instrucons.
   
Ubbink Rolux 184162PP 223176PP, 223177PP
Centrotherm InnoFlue ICRT3539 ISELL0387UV
Heat-Fab Saf-T Vent Saf-T Vent CI Plus Wall
Terminaon Saf-T Vent CI Plus Rain Cap
Metal-Fab Corr/Guard 3CGRVDK 3CGRVT
Ipex Concentric Kit 3”- 196006 /197009 3”- 196006 / 197009
Ipex Low Prole Terminaon Kit —3”- 196985
4”- 196986
Various
Manufacturers
Schedule 40 PVC DWV Solid
Core Pipe (or approved equal)
CPVC schedule 40
Reference “Approved PVC/CPVC
Vent Conguraons” Table
Reference “Approved PVC/
CPVC Vent Conguraons”
Table
 
   
Ubbink Rolux Condensing
Vent System 800-621-9419 678-829-1666 www.rinnai.us
Centrotherm InnoFlue Vent System (single
wall SW, 3 inch diameter) 877-434-3432 518-618-3166
[e-mail]
www.centrotherm.us.com
Heat-Fab Saf-T Vent SC system 800-772-0739 413-863-4803 [e-mail],
www.heaab.com
Metal-Fab Corr/Guard Vent/Air Intake
System 800-835-2830 316-943-2717 [e-mail], www.metal-fabinc.com
Ipex Concentric Kit / Low Prole
Terminaon Kit
U.S. - 800-463-9572
CA. - 866-473-9462 —www.ipexamerica.com www.ipexinc.com
Various
Manufacturers
Schedule 40 PVC DWV Solid Core
Pipe (or approved equal)
CPVC schedule 40
———
Approved Vent Manufacturers
Approved Vent Products


16 C199 Manual
Venng Guidelines

 Do not use cellular core PVC/CPVC.
 Do not use Radel, ABS, or galvanized material to
vent this appliance.
 Do not cover non-metallic vent pipe and ngs
with thermal insulaon.
 Do not combine vent components from dierent
manufacturers.
 Vent diameter must not be reduced.
 Do not connect the venng system with an
exisng vent or chimney.
 Do not common vent with the vent pipe of any
other manufacturer’s water heater or appliance.
Rinnai water heaters can only be common vented
using a Rinnai cered common vent system.

 This water heater is a direct vent water heater and
therefore is cered and listed with the vent
system. You must use vent components that are
cered and listed with the water heater model.
 The vent system must vent directly to the outside
of the building and use outside air for combuson.
 Avoid dips or sags in horizontal vent runs by
installing supports per the vent manufacturer’s
instrucons.
 Support horizontal vent runs every four feet and
all vercal vent runs every six feet or in
accordance with local codes.
 Venng should be as direct as possible with a
minimum number of pipe ngs.
 Vent connecons must be rmly pressed together
so that the gaskets form an air ght seal.
 The vent piece connected to the water heater
must be secured with one self-tapping screw.

 Refer to the instrucons of the vent system
manufacturer for component assembly
instrucons.
 If the vent system is to be enclosed, it is suggested
that the design of the enclosure shall permit
inspecon of the vent system. The design of such
enclosure shall be deemed acceptable by the
installer or the local inspector.

If it becomes necessary to access an enclosed vent
system for service or repairs, Rinnai is not responsible
for any costs or dicules in accessing the vent
system. The warranty does not cover obtaining
access to a vent system in an enclosed environment.

C199 Manual 17

 Prior to the installaon of the vent system, the
unit must be properly adjusted for the venng
conguraon selected for the applicaon.
 Any issues resulng from improper installaon
will not be covered by warranty.
 Ducted outside air is mandatory for all twin pipe
conguraons.
NOTICE
Concentric Vent Conguraon
(Same procedure to be used for Twin Pipe with
Centrotherm Adapter Conguraon)
1. Remove fastener from concentric ue
connecon.
2. Remove exhaust adapter ring.
3. Install the concentric vent. Ensure it is properly
seated.
4. Secure the vent pipe to the unit with a screw
Exhaust Adapter
Ring to be removed
and discarded for
concentric vent
conguraon
Removal of Exhaust Adapter Ring

18 C199 Manual
Intake Cap to be removed and discarded
for twin pipe PVC/CPVC conguraon.

Removal of Intake Cap
1. Remove the fastener from intake connecon.
2. Remove the intake cap.
Twin Pipe PVC/CPVC Conguraon
(3”or 4”)
3. Install the intake pipe. Ensure it is properly
seated.
4. Secure the intake pipe to the unit with the
supplied screw (in the carton box).
5. Install the exhaust pipe. Ensure it is properly
seated.
6. Secure the exhaust pipe to the unit with the
supplied screw (in the carton box).

apply PVC glues, solvents, or cleaners
to the water heaters intake or exhaust gasket
connecons. Failure to correctly assemble the
components according to these instrucons
may result in property damage, personal injury,
or death.
Intake Gasket Connecon
Exhaust Gasket Connecon

C199 Manual 19
Maximum vent length

1. Determine the number of 90 degree elbows in
the vent system. (Two 45 degree elbows count as
one 90 degree elbow.)
2. Refer to the table to nd the maximum vent
length based on the number of elbows.
3. Adjust SW1 in DIPSW 1 (tan switches) if required
by the applicable note.
 If the length is greater than 21  (6.4 m) then
move SW1 to OFF.
 If the length is greater than 15  (4.6 m) then
move SW1 to OFF.
 If the length is greater than 9  (2.7 m) then move
SW1 to OFF.
Move SW1 to OFF.
If you have a longer vent length (see number 3
regarding max. vent length), SW1 in DIPSW 1 is
required to be in the OFF posion. This ensures the
water heater will run properly. Blocked ue
diagnosc codes and shutdowns may result if SW1 in
DIPSW 1 is not in the correct posion.


(Intake is the short UV protected 90° elbow)








If length is greater
than:
041  (12.50 m) 18  (5.49 m) move
SW1 to OFF
126  (7.93 m) 3  (0.91 m) move SW1
to OFF
211  (3.35 m) move SW1 to OFF for
any length







If length is greater
than:
041  (12.50 m) 21  (6.40 m) move
SW1 to OFF
135  (10.67 m) 15  (4.57 m) move
SW1 to OFF
229  (8.84 m) 9  (2.74 m) move
SW1 to OFF
323  (7.01m) 3  (0.91 m) move
SW1 to OFF
417  (5.18 m)
move SW1 to OFF
for any length
511  (3.35 m)
65  (1.52 m)

(Intake is the long UV protected 90° elbow)

InnoFlue Vent System (single wall SW, 3 inch diameter)


(90° elbow is equivalent to 6 feet; 45° elbow is equivalent to 3 feet.)




041 (12.5)1
135 (10.7)2
229 (8.8)3
323 (7.0)4
417 (5.2)4
511 (3.4)4
65 (1.5)4


(90° elbow is equivalent to 6 feet; 45° elbow is equivalent to 3 feet.)




065 (19.8)1
159 (18.0)2
253 (16.2)3
347 (14.3)4
441 (12.5)4
535 (10.7)4
629 (8.8)4
Example: If you have one elbow then your
maximum vent length is 35 feet (10.7 m).
If your actual length is greater than 15 
(4.6 m) then move SW1 in DIPSW 1 to
OFF.

20 C199 Manual
Flue Installaon with Concentric Venng (indoor models only)
Install the venng terminaon according to the diagrams and instrucons below.
Secure the first vent component to the water heater
with one self-tapping screw at the hole.


Slope the venting 1/4” per foot toward the
appliance according to the vent manufacturers
installation instructions.
Dispose of condensate per local codes.
Slope the venting 1/4” per foot toward the
appliance according to the vent manufacturers
installation instructions.
Dispose of condensate per local codes.
Securing Screw