Rinnai RHS199100SEiN Operating instructions

Rinnai Residenal Hybrid System Installaon and Operaon Manual

INSTALLATION AND OPERATION MANUAL

Demand Duo™

Residenal Hybrid Water Heang System

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.

WARNING WARNING

Demand Duo™ Model

RHS199100SE

Contents

READ AND SAVE THESE INSTRUCTIONS

1. Welcome ......................................................... 3

2. Safety .............................................................. 4

Safety Symbols .................................................... 4

Safety Precauons ............................................... 5

3. About .............................................................. 6

Specicaons ....................................................... 6

Dimensions and Connecons .............................. 7

4. Installaon ........................................................... 8

Installaon Guidelines ......................................... 8

Typical Installaon Illustraons .......................... 9

Unpack the Demand Duo™ .............................. 10

Choose an Installaon Locaon ....................... 11

Transporng the Demand Duo™ ....................... 13

Earthquake Strapping Instrucons .................... 13

Installaon Locaon Checklist .......................... 14

5. Venng .......................................................... 15

Venng Guidelines ............................................ 15

Venng Installaon Sequence ........................... 16

Terminaon Consideraons .............................. 16

Select a Vent Type ............................................. 17

6. System Plumbing ......................................... 35

Pressure Relief Valve Requirements ................. 35

PRV Temperature Requirements ..................... 35

Piping Diagram for Basic Installaons ............... 36

Piping Diagram for Mulple Unit Installaons . 37

Connect Water Heater to the Water Supply .... 38

Fill the System .................................................. 38

Condensate ...................................................... 39

7. Gas Supply ..................................................... 41

Connect the Gas Supply .................................... 41

8. Power Supply ............................................... 43

9. Post-Installaon Checklist ............................. 45

10. Maintenance .............................................. 46

11. Appendices .................................................. 47

Service/Maintenance Log ................................. 47

Replacement Parts ........................................... 48

Warranty ........................................................... 49

12. Notes ........................................................... 51

Rinnai Residenal Hybrid System Installaon and Operaon Manual 3

If You Need Service

Contact your local dealer/distributor or call Rinnai

Customer Care at:

1-800-621-9419

Please have your full serial number or model number

available for product- or service-related issues.

Thank you for purchasing Rinnai’s Demand Duo™

Residenal Hybrid Water Heang System. This manual

provides informaon on the installaon, operaon, and

maintenance of Rinnai’s Demand Duo™ Residenal

Hybrid Water Heang System. Read this manual

completely before installing or operang the system.

This manual is a supplement to the Installaon and

Operaon Manual for Residenal RU199 Condensing

Tankless Water Heaters; refer to the RU199 manual for

complete water heater details, including:

• Parameter Sengs (High Altude Adjustment, Vent

Length Adjustment, and more)

• Temperature Controller Installaon

• Performance Data

• Diagnosc Codes

To The Installer

• A trained and qualied professional must

install the system, 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 tankless water

heaters. Training on Rinnai Tankless Water

Heaters is accessible at

www.trainingevents.rinnai.us.

• Read all instrucons in this manual before

installing the system. The system must be

installed according to the exact instrucons in

this manual.

Welcome

1

To The Consumer

• You must read the enre manual to properly

operate the water heater and to have regular

maintenance performed.

• Keep this manual for future reference.

• As when using any appliance generang heat, there

are certain safety precauons you should follow.

See the Safety Precauons secon for detailed

safety precauons.

• Be sure your water heater is installed by a licensed

installer.

• If installing in the state of Massachuses, you must

read the Massachuses State Gas Regulaons

secon in the Installaon and Operaon Manual for

Residenal RU199 Condensing Tankless Water

Heaters (supplied with tankless water heater).

For Your Records

Dealer Name:

Dealer Phone #:

Purchase Date:

Tank Serial #:

System Serial #:

Tank Serial

Number Label

System Serial

Number Label

• Proper installaon is the responsibility of the

installer.

• When installaon is complete, leave this manual

with the system or give the manual directly to the

consumer.

4 Rinnai Residenal Hybrid System Installaon and Operaon Manual

Safety

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.

WARNING

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 moder-

ate injury. It may also be used to

alert against unsafe pracces.

Safety alert symbol. Alerts you to potenal

hazards that can kill or hurt you and others.

DANGER

CAUTION

WARNING

This manual contains the following important safety symbols. Always read and obey all safety messages.

Safety Symbols

Rinnai Residenal Hybrid System Installaon and Operaon Manual 5

• 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 control valve.

− Turn o the incoming water supply.

− 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.

• 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 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.

• Only trained and qualied professionals are permied

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.

• Proper venng is required for the safe operaon of

this appliance.

• 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 water heater 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 water heater. Keep

small children and animals away from the water

heater.

• Hot water outlet pipes leaving the water heater can be

hot to touch.

• Do not store or use gasoline or other ammable

vapors and liquids in the vicinity of this or any other

appliance.

• Install the vent system per local and naonal codes.

• Do not install this water heater above 10,200 

(3,109 m).

• Do not obstruct combuson air to the water heater.

• Failure to properly vent this appliance can result in

death, personal injury and/or property damage.

• 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:

For proper installaon, operaon and safety, it is important to follow the instrucons and adhere to the safety

precauons shown throughout this manual. The following precauons apply to the installer and consumer.

WARNING

DO NOT adjust the internal gas valve. The design is such that adjustment is not

required. Warranty will be voided if the internal gas valve is adjusted.

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.

Safety Precauons

6 Rinnai Residenal Hybrid System Installaon and Operaon Manual

Model RHS199100SE

Appliance Type

Residenal Hybrid Water Heang System Consisng of Condensing Tankless

Water Heater, Insulated Storage Tank, Pump and Controller

Installaon Type Internal (Indoor) Residenal Applicaons

Category Category IV

Ignion System Direct Electronic Ignion

Product Weight 431 lb (195 kg)

Gas Consumpon Btu/hr (kW/h) Minimum: 15,000 (4.3) Maximum: 199,000 (58.3)

Water Supply Pressure 150 PSI (Maximum)

Temperature Seng 98° F (37° C) to 185° F (85° C)

Tank Volume 119 Gallons (450 Liters)

First Hour Delivery* 317 Gallons (1,200 Liters)

Sound Level 49 dB

Electrical Data

Normal 265 W

Standby 44 W

Freeze Protecon 148 W

Max Current 5.5 A

Fuse Tankless Water Heater Engine: 10 Amps, Controller: 10 Amps

Gas Supply Pressure**

Natural 3.5 - 10.5 in. w.c.

Propane 8.0 - 13.5 in. w.c.

By-Pass Flow Control Electronic

Connecons

Gas Supply Inlet: 3/4 in. MNPT Hot Water Outlet: 1-1/2 in. MNPT

Cold Water Inlet: 1-1/2 in. MNPT

Electric Connecons

Appliance: AC 120 Volts, 60Hz.

Integrated Temperature Controller: DC 12 Volts (Digital)

Water Temperature Control Simulaon Feed Forward and Feedback

Complies with South Coast Air Quality

Management District 14 ng/J or 20 ppm NOx

Emission Levels (RU199i)

Yes

Product

Number

Gas

Type

Input

U.S. Gallon / HR Liters / HR at Temperature Rise Indicated

Tank

Capacity

°F 30°F 40°F 50°F 60°F 70°F 80°F 90° 100°F 110°F 120°F 130°F 140°F

BTU/HR kW

°C 17°C 22°C 28°C 33°C 39°C 44°C 50°C 56°C 61°C 67°C 72°C 78°C

RHS199100SE

NG/

LP

199,000 58

119 U.S.

Gals.

GPH 780 585 468 390 334 292 260 234 213 195 180 167

450

Liters

LPH 2,953 2,214 1771 1476 1264 1105 984 886 806 738 681 632

Recovery Capabilies

Specicaons

* First Hour Delivery Rang is a theorecal calculaon based on 70% usable tank capacity (Tank Capacity x .70 + (recovery) = First Hour Rang

** The 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.

About

3

Rinnai Residenal Hybrid System Installaon and Operaon Manual 7

Dimensions and Connecons

RIGHT

TOP

FRONT

LEFT

Measurements in inches (in.)

8 Rinnai Residenal Hybrid System Installaon and Operaon Manual

Installation

4

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

Demand Duo™ 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

tankless water heaters. Training for Rinnai Tankless Water Heaters is accessible online at www.trainingevents.rinnai.us.

• This water heater is suitable for combinaon water

heang and space heang and not suitable for space

heang applicaons only.

• 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 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 the venng secon for adequate

combuson air 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.

• 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.

When installing the Demand Duo™, follow these guidelines:

DO NOT install the Demand Duo™ Residenal

Hybrid Water Heang System outdoors.

DO NOT install the water heater 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 water heater.

The pan must not restrict combuson air ow.

DO NOT install the water heater in an area with

negave air pressure.

DO NOT obstruct the ow of combuson and

venlaon air.

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.

DO NOT

Installaon Guidelines

Rinnai Residenal Hybrid System Installaon and Operaon Manual 9

A Hot Water Outlet

*

B Hot Water Outlet Valve

*

C Cold and Hot Unions

*

D Temperature-Pressure Relief

Valve

E Operaon Unit / Temperature

Control

F Temperature-Pressure Relief

Valve Discharge Pipe

(do not cap, plug, or reduce )

*

G Pressure Relief Valve Discharge

Pipe (do not cap, plug, or reduce )

*

H Condensate Discharge Pipe (Must

include air gap )

*

I Drain Pan

*

J Vent pipe (PVC Room Air shown

for illustraon purposes, see

venng secon for other opons)

*

K Gas Control Valve

*

L Gas Union

*

M Drip Leg (Sediment Trap)

*

N Cold Water Supply Valve

*

O Cold Water Supply

*

P Thermal Expansion Tank

*

Q Non-Tempered Supply Line

*

R Thermostac Mixing Valve

*

S Non-Tempered Return Line

*

* Field Supplied

Mixing Valve Installaon

Cold Water

Supply

Hot

Water

COLD

WATER

SUPPLY

A

B

C

D

O

N

P

J

E

I

F

M

L

K

R

Q

S

G

H

D

HOT WATER

OUTLET

Typical Installaon Illustraons

10 Rinnai Residenal Hybrid System Installaon and Operaon Manual

Carefully unpack your system package and verify the

following contents are included.

If any items are damaged or missing, contact your local

dealer/distributor or call Rinnai Customer Care at

1-800-621-9419. Do not aempt to use any item that

appears damaged.

Items included with system:

• Rinnai Demand Duo™ Residenal Hybrid Water

Heang System

• Temperature and Pressure Relief Valve (Tank)

• Pressure Relief Valve (pre-installed on the

tankless water heater)

• Installaon and Operaon Manual (this manual)

• 2 in. PVC Vent Screens (x2) and Vent Screen

Screws

To avoid danger of suocaon, keep plasc bags

away from babies, small children and pets. Do not

use these bags in cribs, beds, carriages, or playpens.

The bags are not a toy.

WARNING

Gather the recommended tools and parts before

starng installaon.

Items Needed (Not Included)

• Pipe wrenches (x2)

• Phillips Head screwdriver

• Adjustable pliers

• Wire cuers

• Gloves

• Safety glasses

• Level

• Soap or gas leak detector soluon

• Approved venng

• Teon tape (recommended) or pipe

compound

• Pipe insulaon

Other Items You May Need

• 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

• Heat tape

• 5/8 in. ID PVC exible tubing

• Electrical wire

• Concrete wall anchors

• Oponal pipe cover

• PVC glue/cement and primer

• 2 conductor 22 AWG wire for controller

• Single gang electrical box

• Wire nuts

• Unions and drain valves

• Drain pan

• Earthquake strap

Items Included What You’ll Need

Unpack the Demand Duo™

Rinnai Residenal Hybrid System Installaon and Operaon Manual 11

Contaminant Maximum Level

Total Hardness Up to 200 mg/L

Aluminum * Up to 0.2 mg/L

Chlorides * Up to 250 mg/LL

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

When selecng 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.

Environment

* Source: Part 143 Naonal Secondary Drinking Water Regulaons

This secon provides informaon on the importance of water quality to the Rinnai Tankless Water Heater. The

informaon is intended to serve as general guidelines only and is not a complete list of water quality guidelines.

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 external (outdoor) models be used for these locaons where possible. In

applicaons ulizing room air where there are high levels of parculates, Rinnai oers a room air screen.

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 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 a more frequent ushing schedule.

This water heater includes a service indicator (Service Soon, SS). When selected in the parameter sengs, an SS code

will display on the controller indicang that it is me to ush and service the water heater. Scale build-up is caused by

hard water and can be accelerated if the water heater 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.

Choose an Installaon Locaon

Water Quality Guidelines

Consideraon of care for your water heater 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 Rinnai Tankless Water Heater. Water that

contains chemicals exceeding the levels below can damage the Rinnai Tankless Water Heater. Replacement of

components due to water quality damage is not covered by the warranty.

12 Rinnai Residenal Hybrid System Installaon and Operaon Manual

CLEARANCES

Locaon Clearance

Top 2 in. (51 mm)

(0 in. from vent components)

** Clearance for servicing the anode rods is 54 in. from the top of

the water heater

Boom (Ground) 0 in.

Front 6 in. (152 mm)

* Clearance for servicing is 24 in. (610 mm) in front of water heater

Back 0 in.

Sides (Le and Right) 0 in.

Door

0 in. Minimum

** 12 in. Minimum

*6 in. Minimum

Rinnai Residenal Hybrid System Installaon and Operaon Manual 13

• Choose the right hand truck to support the weight

and size of the water heater. Refer to the

Specicaons secon in this manual for specic

weights and dimensions.

• Use proper liing techniques to load the water

heater onto the hand truck:

− Posion the water heater onto the hand truck

so the weight is evenly balanced and the tank is

touching the rails of the hand truck.

− Secure the water heater to the hand truck:

→ Posion STRAP A around the tankless unit

as illustrated below.

→ Posion STRAP B around the base of the

tank below the lower enclosure.

Earthquake Strapping

Instrucons

1. Loosen the screws along the perimeter of the plasc

enclosures.

2. Remove the plasc enclosures.

3. Posion straps around the tank per the requirements

of California Oce of the State Architect. DO NOT

POSITION THE STRAPS OVER PIPE, FITTINGS or

WIRE.

4. Replace the plasc enclosures. Modicaon of the

plasc enclosures may be necessary to t the

enclosures over the earthquake straps.

5. Replace the screws around the perimeter of the

plasc enclosures.

Transporng the

Demand Duo™

Lower

Enclosure

Strap A

Strap B

Products installed in the state of California must be

braced, anchored, or otherwise secured to avoid

moon or falling during an earthquake. Contact the

California Oce of the State Architect located at 1102

Q Street, Suite 5100, Sacramento, CA 95811 for

instrucons.

NOTICE

STRAP

Plasc

Enclosure

(Side)

Plasc

Enclosure

(Boom)

STRAP

14 Rinnai Residenal Hybrid System Installaon and Operaon Manual

□

The water heater is not exposed to corrosive compounds in the air.

□

The water heater 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.

Use this checklist to ensure you have selected the correct locaon for the water heater.

Installaon Locaon Checklist

Rinnai Residenal Hybrid System Installaon and Operaon Manual 15

Venting

5

Venng Guidelines

• When installed as direct vent, the vent system

cered and listed with the appliance. You must use

vent components that are cered and listed with

the water heater model.

• 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.

• Engineered vent systems 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.

• 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.

• Refer to the instrucons of the vent system

manufacturer for component assembly instrucons.

WARNING

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.

DO NOT reduce the vent diameter.

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.

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.

NOTICE

For venng informaon not specied in this secon, refer to the Installaon and Operaon Manual for Residenal

RU199 Condensing Tankless Water Heaters (supplied with each tankless water heater). This manual includes complete

venng informaon, including approved vent manufacturers and terminaons.

NOTICE

16 Rinnai Residenal Hybrid System Installaon and Operaon Manual

1. Install the water heater.

2. Determine the terminaon method—horizontal or vercal, concentric, or twin pipes, etc.

3. Determine proper locaon for wall or roof penetraon for each terminaon.

4. Install terminaon assembly as described in this manual or in the vent manufacturer’s installaon instrucons.

5. Install air and vent piping from water heater to terminaon.

6. Slope horizontal exhaust run towards the water heater 1/4 in per foot. DO NOT slope combuson air pipe

towards water heater.

7. Install vent supports and brackets allowing for movement from expansion, or as per vent manufacturer’s

instrucons or local code requirements.

8. Install vent screen (supplied with water heater) on PVC combuson air and exhaust terminaon elbows as

illustrated below.

• Press vent screen inside of terminaon piece/elbow.

• Secure vent screen to the elbow with screw provided.

Check to determine whether local codes supersede the

following 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 in

above the ground or ancipated snow level.

The vent for this appliance shall not terminate:

• Over public walkways.

• 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.

• Where condensate or vapor could cause damage or

could be detrimental to the operaon of regulators

pressure relief valves, or other equipment.

Listed below are important consideraons 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 part of

the terminaon.

Venng Installaon Sequence

Terminaon Consideraons

Rinnai Residenal Hybrid System Installaon and Operaon Manual 17

Three types of venng opons are available:

Concentric Pipe

Combuson air and exhaust vent directly through a

single concentric connecon. Hot exhaust exits

through the interior tube, while combuson air en-

ters through the outer layer.

Exhaust

Combuson

air

Combuson

air

Combuson

air

Combuson

air

Exhaust

Direct Vent

Non-Direct (Room Air) Vent

Mulple water heaters sharing a combuson air

header and a separate exhaust header that vents

directly through separate penetraons to the outside.

Combuson Air

Exhaust

Room Air

For Combuson

Twin Pipe

Combuson air and exhaust vent directly

through separate penetraons.

Room air is used for combuson while exhaust

vents to the outside.

Mulple water heaters using room air for

combuson while sharing an exhaust header that

vents directly to the outside.

Direct Vent (Concentric Pipe and Twin Pipe)

1

Non-Direct Vent (Room Air)

2

Common Vent (Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)

3

Select a Vent Type

18 Rinnai Residenal Hybrid System Installaon and Operaon Manual

Canadian Installaons

(CSA B149.1)

U.S. Installaons

(ANSI Z223.1 /NFPA 54)

Ref Descripon Direct Vent (Indoor Unit) Direct Vent (Indoor Unit)

A Clearance above grade, veranda, porch, deck, or balcony 12 in. (30 cm) 12 in. (30 cm)

B Clearance to window or door that may be opened 36 in. (91 cm) 12 in. (30 cm)

C Clearance to permanently closed window * *

D

Vercal clearance to venlated sot, located above the terminal within a

horizontal distance of 2  (61 cm) from the center line of the terminal

* *

E Clearance to unvenlated sot * *

F Clearance to outside corner * *

G Clearance to inside corner * *

H

Clearance to each side of center line extended above meter/regulator

assembly

* *

I Clearance to service regulator vent outlet

Above a regulator within 3 

(91 cm) horizontally of the vercal

center line of the regulator vent

outlet to a maximum vercal

distance of 15  (4 m)

*

J

Clearance to non-mechanical air supply inlet to building or the

combuson air inlet to any other appliance

36 in. (91 cm) 12 in. (30 cm)

K Clearance to a mechanical air supply inlet 6  (1.83 m)

3  (91 cm) above if within

10  (3 m) horizontally

L

Clearance above paved sidewalk or paved driveway located on public

property

7  (2.13 m) [1] *

M Clearance under veranda, porch, deck, or balcony 12 in. (30 cm) [2] *

Direct Vent Terminaon Clearances (For Concentric and Twin Pipe)

Direct Vent (Concentric Pipe and Twin Pipe)

1

AIR SUPPLY INLET

VENT TERMINAL

AREA WHERE TERMINAL

IS NOT PERMITTTED

X

V

SNOW

TERMINATION

Clearance in

Ref. A also

applies to

anticipated

snow line

Clearance to opposite wall is 24 in. (60 cm).

[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 mini-

 Clearances are in accordance with local installaon codes and the

requirements of the gas supplier. (Dégagement conforme aux codes

d’installaon locaux et aux exigences du foumisseur de gaz.)

Rinnai Residenal Hybrid System Installaon and Operaon Manual 19

All terminaons (horizontal and/or vercal) must terminate 12 in. (0.30 m) above grade or ancipated snow level.

12 in. (0.30 m)

Between terminals at same level

60 in. (1.52 m)

Between terminals at dierent levels

Note: 24 in. (0.61 m)

to wall or parapet

Combuson air and exhaust vent directly through a single

concentric connecon. Hot exhaust exits through the interior

tube, while combuson air enters through the outer layer.

Combuson

air

Exhaust

Concentric Pipe Terminaon Clearances

Direct Vent (Concentric Pipe)

1

Concentric Pipe Overview

Combuson

air

Inside

Corner

12 in.

(0.30 m)

12 in.

(0.30 m)

60 in. (1.52 m) vercal-

ly between terminals

20 Rinnai Residenal Hybrid System Installaon and Operaon Manual

Remove and discard screw from

concentric ue connecon.

Remove exhaust adapter ring (discard for

concentric venng conguraons).

Concentric

Install the concentric vent. Ensure it

is properly seated.

Secure the vent pipe to the concentric ue

connecon with the supplied screw.

Concentric Pipe Installaon Instrucons

Important: Install the venng terminaon according to the diagrams and instrucons in

this manual. Slope the venting 1/4 in. per foot toward the appliance according to the vent

manufacturer’s installation instructions. Dispose of condensate per local codes.

Direct Vent (Concentric Pipe)

1

2

3

1

4

Concentric Vent Maximum Equivalent Length

Vent Sizes 2 in. X 4 in. 3 in. X 5 in.

Vent Lengths

65  (20 m) 150  (46 m)

• 45° elbow is equivalent to 3  (1 m)

• 90° elbow is equivalent to 6  (2 m)

Concentric Pipe Example Vent Applicaons

Horizontal Wall Terminaons

2 in. x 4 in.

3 in. x 5 in.

Vercal Roof

Terminaons

2 in. x 4 in.

and

3 in. x 5 in.

Concentric Pipe Maximum Vent Length

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