Rinnai Circ-Logic RU98i User manual

1Rinnai CVent
Common Vent Installaon Manual
For the RU98i (REU-KB3237FFUD-US) Condensing Water Heater
This manual is a supplement to the appliance manual.
Addional informaon can be obtained from the Rinnai water heater manual.
The exhaust vent system, CVent, is supplied by Ubbink.
—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
Certified to ANS Z21.10.3 - CSA 4.3
Only for U.S. installations
100000287 Version B
12/2012
This enre manual must be le for the consumer. The consumer must read and
refer to this manual for proper operaon and maintenance of the common vent system.

2Rinnai CVent
Descripon
The CVent Common Venng system provides longer vent lengths and fewer wall or roof penetraons than
convenonal single-unit venng. For the exhaust ue, CVent ulizes a CSA-cered and tested polypropylene
venng material from Ubbink, the same supplier for Rinnai's innovave line of concentric venng. The various
secons are self locking and sealing and can be pushed together without use of cement or glue.
CVent is only for use in U.S. installaons and is not currently approved for use in Canada.
Model Applicability
The common vent system is CSA cered (ANSI Z21.10.3, Gas Water Heaters Standards) for use only with the
Rinnai tankless condensing water heater RU98i (REU-KB3237FFUD-US).
Installer Qualicaons .......................................... 2
Descripon............................................................ 2
Model Applicability............................................... 2
Safety Symbols...................................................... 3
Warranty and Liability Exclusions ......................... 3
Specicaons ........................................................ 3
Parts/Kits............................................................... 4
Sample Roof Installaon....................................... 8
Sample Horizontal Terminaon Installaon………. 9
Spare Parts List………………………………………………….10
Venng Guidelines.............................................. 11
Maximum Equivalent Vent Length...................... 12
CVent Terminaon Clearances............................13
Exhaust Vent Terminaon Clearances ................14
Maintenance Clearances.....................................16
Water Heater Clearances....................................16
Installaon Instrucons.......................................17
Common Header Check valve Maintenance....... 22
Final Checklist......................................................23
Appendix
Ubbink CVent Assembly Instrucons..................24
A licensed professional must install the common
venng.
The installer should have skills such as
 connecng gas lines, water lines, valves, and
electricity
 knowledge of applicable naonal, state, and local
codes
If you lack these skills, contact a licensed professional.
Installaon is cered for sea level (0-2000 feet) only.
For installaons above 2000 feet refer to the Rinnai
Installaon and Operaon Manual for other venng
opons.
Installer Qualicaons
Table of Contents
Improper installation of the vent system and components, or failure to follow all
installation instructions, can result in serious injury.
WARNING

3Rinnai CVent
Indicates an imminently hazardous situaon which, if not avoided, will result in death
or serious injury.
Indicates a potenally hazardous situaon which, if not avoided, could result in death
or serious injury.
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.
This is the safety alert symbol. This symbol alerts you to potenal hazards that can kill or hurt you
and others.
DANGER
CAUTION
WARNING
Specicaons
Number of
water
heaters*
Percent
De-rated Total Btu Rate
Manifold Pressure Btu at
Minimum Rate
(without MSB)
Btu at
Minimum Rate
(with MSB)
Maximum
Rate “W.C.
Minimum
Rate “W.C.
10% 199,000 3.0 0.42 15,200
15,200
21% 394,000 3.1 0.42 30,400
31.5% 588,000 3.1 0.42 45,600
42% 780,000 3.1 0.42 60,800
52.5% 970,000 3.2 0.45 76,000
63% 1,158,000 3.2 0.45 91,200
73.5% 1,344,000 3.2 0.45 106,400
84% 1,528,000 3.2 0.45 121,600
* RU98i (REU-KB3237FFUD-US)
Altude: 0-2000 feet
Natural and propane gas
Water heaters using CVent will automacally de-rate according to the table below. Use the table below for
calculang your total Btu for mulple water heaters using CVent.
Safety Symbols
NOTE: Installaon is cered for sea level (0-2000 )
only. For installaons above 2000  refer to the
Rinnai Operaon and Installaon Manual for
other venng opons.
Claims for personal and material damages are excluded, if they are due to any or several of the following rea-
sons:
•Use of the Cvent system not in accordance with the regulaons.
•Improper assembly and incorrect operaon.
•Faulty maintenance.
•Non-compliance with the assembly and operang instrucons.
•Non-approved structural changes to the unit or to the individual components.
•Installaon of components which are not part of the Cvent system .
•Subsequent damage, which occurred through further use of the Cvent system despite known defects.
•Intenonal damage.
•Acts of God.
Warranty and Liability Exclusions

4Rinnai CVent
CVent Starter Kit
790005
8-Inch For Back–2-Back or InLine
Combustion Air & Exhaust
1
2
34
5
CVent InLine Kit
790007
8-Inch Header Kit For InLine
Combustion Air & Exhaust
15
24
36
Qty. 1
Qty. 1
Qty. 1 Qty. 1
Qty. 2
Qty. 1
Qty. 1
Qty. 1
Qty. 1Qty. 1
Qty. 1
NO QTY DESCRIPTION
11CVENT ENDPIECE (EXHAUST) W/ CLEANOUT & CONDEN-
21CVENT COMB AIR ENDPIECE D8
31CVENT CONDENSATE TRAP (32mm Connection)
41CVENT DRAIN HOSE
52CVENT DRAIN HOSE CLAMP
61UBBINK INSTALLATION INSTRUCTION
71CENTROCERIN LUBRICANT
NO QTY DESCRIPTION
11CVENT COLLECTOR, 1 CONNECTION, D8 X L20 X D4 (Exhaust)
21CVENT ELBOW D4 X 87° WITH CLEANOUT
31CVENT EXTENTION, D4 X L18
41CVENT APPLIANCE ADAPTER, CHECK VALVE AND HOSE TRAP
51CVENT COMB. AIR COLLECTOR, 1 CONNECTION, D8 X L20 X D3
61CVENT COMB AIR FLEX FITTING, D3
71CENTROCERIN LUBRICANT
Ø4” Ø3”
7
7

5Rinnai CVent
CVent Back-2-Back Kit
790008
8-Inch Header Kit For Back-2-Back
Combustion Air & Exhaust
NO QTY DESCRIPTION
11CVENT COLLECTOR, 2 CONNECTION, D8 X L20
22CVENT ELBOW D4 X 87° WITH CLEANOUT
32CVENT EXTENSION, D4 X L18
42
CVENT APPLIANCE ADAPTER WITH CHECK
VALVE AND TRAP
51CVENT COMB. AIR COLLECTOR, 2 CONNECTION,
62CVENT COMB. AIR FLEX FITTING, D3
71CENTROCERIN LUBRICANT
15
24
36
Qty. 2
Qty. 2
Qty. 2
Qty. 2
Qty. 1
Qty. 1
Ø4” Ø3”
Ø4” Ø3”
7

6Rinnai CVent
Parts / Kits
CVent Common Venng Exhaust / Intake Components (PPtl, polypropylene translucent)
Part No. Descripon Part No. Descripon
790005 CVent 8-in Starter Kit 790024 CVent 8-in Brackets
790007 CVent 8-in InLine Kit 790025 Centrocerin lubricant
790008 CVent 8-in Back-2-Back Kit 790035 CVent Extension, D4 x L18
790001 CVent 8-in Roof Terminaon Kit 790028 CVent Extension, D4 x L39
790002 CVent 8-in Flat Roof Flashing 790029 CVent Elbow D8 x 90 degree Vercal Support
790003 CVent 8-in Pitched Roof Flashing 790030 CVent 8-in Chase Cover
790004 CVent 8-in Wall Terminaon Kit 790031 CVent 8-in Vent Distancer, stainless steel
790020 CVent Extension, D8 x L18 790034 CVent 8-in Vent Rain Cap
790021 CVent Extension, D8 x L39 790032 Inverter Coupling Kit with condensate trap
790022 CVent Elbow D8 x 45degree (2 in a box) 780037 Combuson Air PVC Adapter Kit
790023 CVent Elbow D8 x 90degree
Cvent 8-in Roof Termination Kit with PVC adapter
790001
31” Ø12.2”
Ø0.24” (Qty. 4)
Interior Slip
Fit Wall Plate
Ø7.89”
Termination Kits
Cvent 8-in Wall Termination Kit (Combustion Air & Exhaust)
790004
PP-PVC
Adapter
(For Combustion Air
PVC transition)
Centrocerin
Lubricant
CVent 8-in Roof Termination
(Outer shell: Stainless Steel)
Centrocerin lubricant
(Material: Stainless Steel)

7Rinnai CVent
8 INCH VENT COMPONENTS
CVent 8-in Chase Cover
#790030
CVent Pitched Roof Flashing (Including
Storm Collar) #790003
CVent Flat Roof Flashing
#790002
CVent 8in Vent Rain Cap
#790034
Inverter Coupeling Kit With Condensate Trap
#790032
CVent Elbow D8x45 degree
#790022 (Qty.2)
CVent Elbow D8x90 degree
#790023
CVent Extension D8xL18” #790020,
D8xL39” #790021
CVent Elbow D8x90 degree
Vertical Support #790029
CVent 8-in
Bracket #790024
CVent 8in Vent
Distancer #790031
Combustion Air PVC Adapter Kit
#780037

8Rinnai CVent
CVent Extension
D4xL18 #790035
D4xL39 #790028
4 INCH VENT COMPONENTS
Sample Roof Assembly
Field Supplied
PVC Components
Field Supplied 8”
PVC Flashing
CVent 8-in Roof Termination
Kit with PVC Adapter
#790001
Cvent pitched roof moldable
flashing #790003
CVent 8-in Rain Cap
#790034
OPTIONAL
NOTE: Use PVC
adapter (illustrate
above) at the
combustion air
header when
transitioning to
PVC

9Rinnai CVent
Part Number: 790008
CVent Back-2-Back Kit (QTY. 4)
Part Number:790020 / 790021
CVent Extension (Qty. 5)
Part Number:780037
Combustion Air PVC Adapter
Kit (Qty. 1)
Part Number:790027
CVent Elbow D4 x 90
(Qty. 2)
Part Number: 790005
CVent Starter Kit (Qty. 1)
Part Number:790004
Wall Termination Kit
Combustion Air & Exhaust (Qty 2)
Field Supplied
PVC Components
Field Supplied
PVC Components
Sample Horizontal Termination Assembly

10 Rinnai CVent
Included
With Kit
No.
Part
No. Description Image
Exhaust Vent Components
790005 790042 CVent Endpiece
790005 790048 Condensate Trap (32mm Connection)
790005 790049 Hose + 2 Clamps
790007 790040 Exhaust Collector, 1 connection, D8 x L20, D4 connection
790008 790041 Exhaust Collector, 2 connections, D8 x L20, D4 connection
790007
790008 790035 CVent Extension, D4 x L18
790007
790008 790039 CVent Elbow D4 x 87degree with cleanout
Combustion Air Vent Components
790005 780046 Intake/Combustion Air Endpiece
790007 780044 Combustion Air Collector, 1 connection, D8 x L20, D3 connection
790008 780045 Combustion Air Collector, 2 connection, D8 x L20, D3 connection
790007
790008 780050 CVent flex Line D3
Appliance Adapter
790007,
790008 790038 CVent Appliance and Check Valve & hose (new!)
Spare Parts List
Ø8
Ø8
Ø8
Ø4
Ø8
Ø4
Ø4
Ø4
Ø4
Ø4
Ø3
Ø3
Ø3
Ø8
Ø3
Ø3
Ø8
Ø3