Rinnai Sensei RU130i User manual

PVC/CPVC Common Venng Installaon Instrucons 1
For U.S. and Canadian Installaons
CUS
—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 licensed professional.
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.
WARNING
100000625(01) 12/18
RU199i (REU-N3237FF-US)
RU180i (REU-N2934FF-US)
RU160i (REU-N2530FF-US)
RU130i (REU-N2024FF-US)
CU199i (REU-N3237FFC-US)
CU160i (REU-N2530FFC-US)
RUR199i (REU-NP3237FF-US)
RUR160i (REU-NP2530FF-US)
RSC199i (REU-NP3237FF-US(A))
RSC160i (REU-NP2530FF-US(A))
MODELS
CERTIFIED TO ANSI Z21.10.3 - CSA 4.3

PVC/CPVC Common Venng Installaon Instrucons 2
READ AND SAVE THESE INSTRUCTIONS
Contents
Welcome............................................................................................................................................3
Safety.................................................................................................................................................4
About the Common Venng System ...................................................................................................5
Venng Guidelines............................................................................................................................... 5
Schedule 40 PVC/CPVC Common Vent Guidelines.............................................................................. 7
High Altude Installaons.................................................................................................................... 8
Common Vent Maximum Equivalent Lengths..................................................................................... 9
3 in. Common Venng ......................................................................................................................10
3 in. Direct Vent and Room Air.......................................................................................................... 10
4 in. Common Venng ......................................................................................................................11
4 in. Direct Vent and Room Air.......................................................................................................... 11
6 in. Common Venng ......................................................................................................................12
6 in. Direct Vent and Room Air.......................................................................................................... 12
Common Vent Terminaons.............................................................................................................13
Sample Horizontal Terminaon Assembly ........................................................................................14
Sample Vercal Terminaon Assembly-Room Air.............................................................................15
Maintenance Clearances...................................................................................................................16
Water Heater Clearances................................................................................................................... 16
Vercal Terminaon Clearances........................................................................................................ 16
Horizontal Terminaon Clearances ................................................................................................... 17
Combuson Air Requirements..........................................................................................................18
Exhaust Vent Terminaon Clearances...............................................................................................21
Addional Clearances.......................................................................................................................23
Installaon Instrucons (Condensate Trap and Drain Pipe)...............................................................24
Final Checklist...................................................................................................................................24
Copyright © 2023 Rinnai America Corporaon. All Rights Reserved.

PVC/CPVC Common Venng Installaon Instrucons 3
This manual provides installaon instrucons for PVC/CPVC common venng and is a supplement to the Installaon
and Operaons Manual supplied with the Rinnai Tankless Water Heater.
Common venng must sasfy all the requirements of the Installaon and Operaons Manual, as well as the
requirements in this manual.
For detailed informaon on the Rinnai Tankless Water Heater, including installaon instrucons, refer to the Tankless
Water Heater Installaon and Operaon Manual or view an online version at rinnai.us.
Welcome
To The Installer
• This manual is intended for the trained and qualied professional and is designed for licensed installers who
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 on Rinnai Tankless Water Heaters is
accessible at www.trainingevents.rinnai.us
• A trained and qualied professional must test the Common Venng System for leaks before use.
• The installaon must conform to the Rinnai Tankless Water Heater Installaon and Operaon Manual that is
shipped with the unit, local codes, or in the absence of local codes, with the Naonal Fuel Gas Code,
ANSI Z223.1/NFPA 54.
• Read all instrucons contained in this manual before installing the Common Venng System.
• Proper installaon is the responsibility of the installer.
• When installaon is complete, give all manuals related to the common venng installaon (including this
manual and the Rinnai Tankless Water Heater Installaon and Operaon Manual) directly to the
consumer. The manuals should be stored in a readily accessible locaon for future reference.
To The Consumer
• Keep this manual for future reference.
• Be sure your Common Venng System is installed by a trained and qualied professional.

PVC/CPVC Common Venng Installaon Instrucons 4
• 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.
• Installaons must comply with local requirements and with the Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54 for
U.S. installaons.
• Use only the materials listed in this manual for vent, air intake pipe, and ngs. Failure to comply with this
warning could result in property damage.
• DO NOT slope the combuson air pipe toward unit. Failure to comply with this warning could result in property
damage, personal injury, or death.
• DO NOT apply PVC/CPVC glues, solvents, or cleaners to the tankless water heater’s intake or exhaust gasket
connecons. Failure to correctly assemble the components according to these instrucons and the Rinnai water
heater installaon and operaon manual may result in property damage, personal injury, or death.
READ ALL INSTRUCTIONS BEFORE INSTALLATION
WARNING
Safety Symbols
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.
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
Topics in this secon
• Safety Symbols

PVC/CPVC Common Venng Installaon Instrucons 5
Venng Guidelines
About the Common Venng System
Common venng allows mulple Rinnai Tankless Water Heaters to share the same vent system.
Rinnai Tankless Water Heaters can only be common vented with Schedule 40 PVC/CPVC or with a Rinnai cered
common vent system.
Example: Rinnai Common Venting Example: Schedule 40 PVC/CPVC
Common Venting
• Use only the materials listed in this manual for vent, air intake pipe, and ngs. Failure to comply with this
warning could result in property damage, personal injury, or death.
• When cung vent components, ensure that the cuts are straight.
• Chamfer and deburr all edges before installing the components.
• Vent joints must not leak. Conrm gas ght connecons of every vent joint.
• Before operang the water heater(s), ensure vent system is clean and free of debris.
• Vent system must be supported according to the vent manufacturer’s installaon instrucons.
• Venng should be as direct as possible with a minimum number of ngs.
• The common vent system must only be installed by a trained and qualied professional.
Common Vent Terminaon Clearances
• 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 requirements of the gas supplier.
Topics in this secon
• Venng Guidelines
• Schedule 40 PVC/CPVC Common Vent
Guidelines
• High Altude Installaons
• Common Vent Maximum Equivalent
Vent Lengths

PVC/CPVC Common Venng Installaon Instrucons 6
Do Not
• Do not exceed the maximum number of units indicated in the Rinnai Tankless Water Heater Installaon and
Operaon Manual.
• Do not use cellular core PVC/CPVC, Radel, ABS or galvanized material for the exhaust vent.
• Do not combine vent components from dierent manufacturers.
• Do not connect the venng system with an exisng vent or chimney.
• Do not cover vent components with thermal insulaon.
• Do not common vent with the vent pipe of any other type of water heater or appliance.
• Do not reduce vent diameter to less than 2 in. (51 mm).
• Do not install the water heater in an area of negave pressure.
• Do not install the water heater, venng, and vent terminaon(s) in any areas where the air may contain
corrosive compounds.
Must Do
• 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 or room 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 a minimum of every four feet and all vercal vent runs a minimum of every six
feet.
• Venng should be as direct as possible with a minimum number of pipe ngs.
• Vent components connected to the water heater must be secured with one self-tapping screw. Do not use
any glues or solvents to connect vent components to the water heater.
• Set the temperature seng on all water heaters being common vented to the same temperature.
WARNING
DO NOT slope the combustion air pipe toward unit. Failure to comply with this warning could result in property
damage, personal injury, or death.
DO NOT apply PVC/CPVC glues, solvents, or cleaners to the tankless water heater’s intake or exhaust gasket
connections. Failure to correctly assemble the components according to these instructions may result in property
damage, personal injury, or death.

PVC/CPVC Common Venng Installaon Instrucons 7
PVC solvents (primer and glue) can be extremely flammable. Vapors may cause a flash fire or
explosion resulting in property damage, personal injury or death.
• Keep solvents away from heat, sparks, flames and all other sources of ignition.
• Do not solder, cut or weld until all vapors have dissipated.
• PVC solvents are heavier than air causing them to settle at low points of the system.
• Before using PVC solvent:
− Disconnect power to the water heater.
− Remove the front cover of the water heater.
− Ensure areas around the water heater and PVC venting are well ventilated.
− Allow all vapors to dissipate before applying power to the system or introducing any other source of ignition.
When installing PVC/CPVC Common Vent, follow these guidelines:
•Avoid sharp bends or tees in the vent system.
These vent components create addional
restricons that could reduce performance of
the water heaters.
•PVC combuson air and exhaust should
terminate with elbow or tee poinng down.
This will stop unwanted moisture from
entering the vent system.
•Fire rated penetraons shall be restopped.
Contact your vent supplier or local restop
manufacturer for appropriate restop
methods.
•Examine all vent components for damage prior to
installaon.
•PVC/CPVC vent systems must be free to expand and
contract. Refer to the vent manufacturer’s
installaon instrucons for appropriate support
methods.
•PVC/CPVC venng must include unrestricted vent
movement through walls, ceilings, and roof
penetraons.
•Use only PVC/CPVC primer and cement approved
for use by the vent manufacturer.
•Refer to vent manufacturer’s installaon
instrucons for proper joint assembly procedures
and products.
•PVC/CPVC common venng should include a
condensate drain and trap between the header and
vent length. Condensate trap must include a loop
that can hold 6 in. (15 cm) of water. See “PVC/CPVC
Common Vent Installaon” illustraon on this page.
WARNING
DO NOT mix vent pipe, ngs or joining methods
from dierent vent manufacturers.
DO NOT aempt to repair damaged vent. Damaged
vent components must be replaced.
DO NOT use short radius elbows in the common
vent system.
DO NOT
ACCEPTABLE ACCEPTABLE NOT ACCEPTABLE
90° Elbows,
Long Sweep
90° Elbows,
Short Sweep
90° Elbows,
Close Turn
HEADER VENT
PVC/CPVC Common Vent Installation
Schedule 40 PVC/CPVC Common Vent Guidelines

PVC/CPVC Common Venng Installaon Instrucons 8
High Altude Installaons
Tankless water heaters using common venng at altudes over 2,000  (610 m) will automacally derate according to
the tables below. Use the tables below for calculang your total BTU for mulple tankless water heaters.
• High altude installaons are cered up to 10,200  (3,109 m).
• Reference the respecve Rinnai Tankless Water Heater Installaon and Operaon Manual to set the water
heater up for the altude at which they will be operang.
High Altude Derate
PROPANE (LP GAS)
Number
of Water
Heaters
2,001 -
5,200 
5,201 -
7,700 
7,701 -
10,200 
1168,000 151,000 120,000
2332,640 298,980 237,600
3493,920 443,940 352,800
4651,840 585,880 465,600
5806,400 724,800 576,000
6957,600 860,700 684,000
71,105,440 993,580 789,600
81,249,920 1,123,440 892,800
NATURAL GAS
Number
of Water
Heaters
2,001 -
5,200 
5,201 -
7,700 
7,701 -
10,200 
1170,000 153,000 139,000
2336,600 302,940 275,220
3499,800 449,820 408,660
4659,600 593,640 539,320
5816,000 734,400 667,200
6969,000 872,100 792,300
71,118,600 1,006,740 914,620
81,264,800 1,138,320 1,034,160
NOTE
Unless recovering a tank, Rinnai recommends electronically connecng with common
venng and where water heaters are in a manifold system. Refer to the Rinnai
Tankless Water Heater Installaon and Operaon Manual for addional details on
electronically connecng mulple water heaters.

PVC/CPVC Common Venng Installaon Instrucons 9
For the table below:
• Header is the main vent pipe into which several vents connect.
• Vent Length is the distance from the end of the header to the vent
terminaon.
• Maximum vent length starts at the end of the header system.
• Use 10  (3 m) as equivalent vent length for 90° elbows.
• For use with SENSEI™ internal (indoor) tankless
water heaters.
Header Vent Length
Common Vent Maximum Equivalent Vent Lengths
Common Vent Maximum Equivalent Vent Length
Rinnai Common Vent System or Schedule 40 PVC/CPVC
Water Heater
Model # Water Heaters
Max
System
BTU/HR
HEADER DIAMETER
3 in. 4 in. 6 in.
3 in.
Vent Diameter 4 in. Vent Diameter 6 in. Vent Diameter 6 in. Vent Diameter
RU199i
(REU-N3237FF-US)
CU199i
(REU-N3237FFC-US)
RUR199i
(REU-NP3237FF-US)
RSC199i
(REU-NP3237FF-US(A))
2398,000 65  150 
150 
150 
3597,000
4796,000 65 
5995,000
61,194,000
71,393,000 70 
81,592,000
91,791,000 90 
10 1,990,000
11 2,189,000 41 
12 2,388,000
RU160i
(REU-N2530FF-US)
CU160i
(REU-N2530FFC-US)
RUR160i
(REU-NP2530FF-US)
RSC160i
(REU-NP2530FF-US(A))
2320,000 90  150 
150 
150 
3480,000 100 
4640,000 65 
5800,000
6960,000
RU180i
(REU-N2934FF-US)
2360,000 65 
150 
150 
150 
3540,000
4720,000 65 
5900,000
61,080,000
71,260,000 70 
81,440,000
91,620,000 90 
10 1,800,000
11 1,980,000 41 
12 2,160,000
RU130i
(REU-N2024FF-US)
2260,000 90  150 
150 
150 
3390,000 100 
4520,000 65 
5650,000
6780,000

PVC/CPVC Common Venng Installaon Instrucons 10
3 in. Common Venng
EXHAUST
AIR
INTAKE
Direct Vent
Room Air
Inline
• Refer to the “Combuson Air Requirements” secon of this manual for room
air requirements.
EXHAUST
Inline
AIR
INTAKE
AIR
INTAKE