Rinnai Common Vent for the RU98i Owner's Manual

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Common Vent Installation Manual

For the RU98i (REU-KB3237FFUD-US) Condensing Water Heater

This manual is a supplement to the appliance manual.

Additional information can be obtained from the Rinnai water heater manual. The exhaust vent system, CVent, is supplied by Ubbink.

Certified to ANS Z21.10.3 - CSA 4.3

Only for U.S. installations

WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

Do not store or use gasoline or other flammable 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 instructions.

If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a licensed professional.

This entire manual must be left for the consumer. The consumer must read and refer to this manual for proper operation and maintenance of the common vent system.

1

Rinnai CVent

Table of Contents

 

Installer Qualifications ..........................................

2

Description............................................................

2

Model Applicability...............................................

2

Safety Symbols......................................................

3

Warranty and Liability Exclusions .........................

3

Specifications ........................................................

3

High Altitude Installation ......................................

4

Water Heater Installation .....................................

4

Parts/Kits...............................................................

5

Sample Roof Installation.......................................

9

Sample Horizontal Termination Installation………. 10

Spare Parts List………………………………………………….11

Venting Guidelines ..............................................

12

Maximum Equivalent Vent Length......................

13

CVent Termination Clearances............................

14

Exhaust Vent Termination Clearances ................

15

CVent Maintenance Clearances ..........................

17

Water Heater Clearances....................................

17

CVent Installation Instructions............................

18

Common Header Check valve Maintenance.......

23

Final Checklist......................................................

24

Appendix

 

Ubbink CVent Assembly Instructions ..................

25

Installer Qualifications

WARNING Improper installation of the vent system and components, or failure to follow all installation instructions, can result in serious injury.

A licensed professional must install the common

If you lack these skills, contact a licensed professional.

venting.

 

The installer should have skills such as

 

connecting gas lines, water lines, valves, and electricity

knowledge of applicable national, state, and local codes

Description

The CVent Common Venting system provides longer vent lengths and fewer wall or roof penetrations than conventional single-unit venting. For the exhaust flue, CVent utilizes a CSA-certified and tested polypropylene venting material from Ubbink, the same supplier for Rinnai's innovative line of concentric venting. The various sections are self locking and sealing and can be pushed together without use of cement or glue.

CVent is only for use in U.S. installations and is not currently approved for use in Canada.

Installation is certified for up to 10,200 feet. Refer to the installation / operations manual for the tankless engine (RU98) for appropriate dip switch selection. Refer to High Altitude Installation section for appropriate de-rate values.

Model Applicability

The common vent system is CSA certified (ANSI Z21.10.3, Gas Water Heaters Standards) for use only with the Rinnai tankless condensing water heater RU98i (REU-KB3237FFUD-US).

Rinnai CVent

2

Safety Symbols

This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others.

DANGER

WARNING

CAUTION

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It may also be used to alert against unsafe practices.

Warranty and Liability Exclusions

Claims for personal and material damages are excluded, if they are due to any or several of the following reasons:

Use of the Cvent system not in accordance with the regulations.

Improper assembly and incorrect operation.

Faulty maintenance.

Non-compliance with the assembly and operating instructions.

Non-approved structural changes to the unit or to the individual components.

Installation of components which are not part of the Cvent system .

Subsequent damage, which occurred through further use of the Cvent system despite known defects.

Intentional damage.

Acts of God.

Specifications

Water heaters using CVent will automatically de-rate according to the table below. Use the table below for calculating your total Btu for multiple water heaters using CVent.

* RU98i (REU-KB3237FFUD-US)

Altitude: 0-2,000 feet

Natural and propane gas

Number of

Percent

 

Btu at

Btu at

 

water

Total Btu Rate

Minimum Rate

Minimum Rate

 

De-rated

 

heaters*

 

(without MSB)

(with MSB)

 

 

 

 

 

 

 

 

 

 

1

0%

199,000

15,200

 

 

 

 

 

 

 

 

2

1%

394,000

30,400

 

 

 

 

 

 

 

 

3

1.5%

588,000

45,600

 

 

 

 

 

 

 

 

4

2%

780,000

60,800

15,200

 

 

 

 

 

 

5

2.5%

970,000

76,000

 

 

 

 

 

 

 

 

 

6

3%

1,158,000

91,200

 

 

 

 

 

 

 

 

7

3.5%

1,344,000

106,400

 

 

 

 

 

 

 

 

8

4%

1,528,000

121,600

 

 

 

 

 

 

 

 

 

 

3

 

 

Rinnai CVent

High Altitude Installations

The Rinnai RU98i (REU-KB3237FFUD-US) has been certified for use with the CVent Common Exhaust Vent System at high altitude installations up to 10,200 feet. (3,109 m). The common vent system is CSA certified (ANSI Z21.10.3, Gas Water Heaters Standards) for use only with the Rinnai tankless condensing water heater RU98i (REU-KB3237FFUD-US).

For CVent installations at altitude you must ensure that the water heaters are properly installed and setup for the altitude that they will be operating at. (For information on how to adjust altitude settings reference the installation/ operations manual for the RU98i (REU-KB3237FFUD-US) tankless water heater)

Water heaters using CVent at altitudes over 2,000ft will automatically de-rate according to the table below. Use the tables below for calculating your total Btu for multiple water heaters using CVent at elevation:

* RU98i (REU-KB3237FFUD-US) Altitude: 2,001-10,200 feet Natural and propane gas

High Altitude De-Rate plus Cvent De-Rate - Natural Gas

Number

 

 

 

of Water

 

 

 

Heaters

2001-5200 Ft

5201 - 7700 Ft

7701 - 10200 Ft

1

170,000

153,000

139,000

2

336,600

302,940

275,220

3

499,800

449,820

408,660

4

659,600

593,640

539,320

5

816,000

734,400

667,200

6

969,000

872,100

792,300

7

1,118,600

1,006,740

914,620

8

1,264,800

1,138,320

1,034,160

High Altitude De-Rate plus Cvent De-Rate - LP Gas

Number

 

 

 

of Water

 

 

 

Heaters

2001-5200 Ft

5201 - 7700 Ft

7701 - 10200 Ft

1

168,000

151,000

120,000

2

332,640

298,980

237,600

3

493,920

443,940

352,800

4

651,840

585,880

465,600

5

806,400

724,800

576,000

6

957,600

860,700

684,000

7

1,105,440

993,580

789,600

8

1,249,920

1,123,440

892,800

Water Heater Installation

For information regarding the installation of the RU98i (REU-KB3237FFUD-US) tankless water heater, please reference the installation operations manual included with the tankless unit.

Set the water heater for “Long Vent” by adjusting the # 1 switch to the OFF Position. (Must be done on all tankless heaters when using CVent System)

4

Rinnai CVent

Rinnai Common Vent for the RU98i Owner's Manual

CVent Starter Kit 790005

8-Inch For Back–2-Back or InLine Combustion Air & Exhaust

NO

QTY

DESCRIPTION

 

 

CVENT ENDPIECE (EXHAUST) W/ CLEANOUT & CONDEN-

1

1

SATE DRAIN (32mm)

2

1

CVENT COMB AIR ENDPIECE D8

3

1

CVENT CONDENSATE TRAP (32mm Connection)

4

1

CVENT DRAIN HOSE

5

2

CVENT DRAIN HOSE CLAMP

6

1

UBBINK INSTALLATION INSTRUCTION

7

1

CENTROCERIN LUBRICANT

 

Qty. 1

3 Qty. 1

Qty. 1

1

4

2

Qty. 1

5

Qty. 2

 

7

CVent InLine Kit 790007

8-Inch Header Kit For InLine Combustion Air & Exhaust

NO QTY DESCRIPTION

11 CVENT COLLECTOR, 1 CONNECTION, D8 X L20 X D4 (Exhaust)

21 CVENT ELBOW D4 X 87° WITH CLEANOUT

31 CVENT EXTENTION, D4 X L18

41 CVENT APPLIANCE ADAPTER, CHECK VALVE AND HOSE TRAP

51 CVENT COMB. AIR COLLECTOR, 1 CONNECTION, D8 X L20 X D3

61 CVENT COMB AIR FLEX FITTING, D3

71 CENTROCERIN LUBRICANT

1 Qty. 1

5 Qty. 1

 

Ø4”

Ø3”

 

 

Qty. 1

 

Qty. 1

2

 

4

 

Qty. 1

Qty. 1

3

6

7

5

Rinnai CVent

CVent Back-2-Back Kit 790008

8-Inch Header Kit For Back-2-Back Combustion Air & Exhaust

NO

QTY

DESCRIPTION

1

1

CVENT COLLECTOR, 2 CONNECTION, D8 X L20

2

2

CVENT ELBOW D4 X 87° WITH CLEANOUT

3

2

CVENT EXTENSION, D4 X L18

 

 

CVENT APPLIANCE ADAPTER WITH CHECK

4

2

VALVE AND TRAP

 

 

CVENT COMB. AIR COLLECTOR, 2 CONNECTION,

5

1

D8 X L20 X D3

6

2

CVENT COMB. AIR FLEX FITTING, D3

7

1

CENTROCERIN LUBRICANT

1

Qty. 1

5

Qty. 1

Ø3”

 

 

 

Ø4”

 

 

 

 

 

 

Ø4”

Ø3”

 

 

Qty. 2

 

Qty. 2

2

 

4

3 Qty. 2

6 Qty. 2

7

Rinnai CVent

6

Parts / Kits

CVent Common Venting Exhaust / Intake Components (PPtl, polypropylene translucent)

Part No.

Description

 

Part No.

Description

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 Termination Kit

 

790028

CVent Extension, D4 x L39

 

 

 

 

 

790002

CVent 8-in Flat Roof Flashing

 

790029

CVent Elbow D8 x 90 degree Vertical Support

 

 

 

 

 

790003

CVent 8-in Pitched Roof Flashing

 

790030

CVent 8-in Chase Cover

 

 

 

 

 

790004

CVent 8-in Wall Termination 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)

 

790037

Combustion Air PVC Adapter Kit

 

 

 

 

 

790023

CVent Elbow D8 x 90degree

 

 

 

 

 

 

 

 

Termination Kits

Cvent 8-in Roof Termination Kit with PVC adapter 790001

PP-PVC

Centrocerin

CVent 8-in Roof Termination

Adapter

Lubricant

(Outer shell: Stainless Steel)

(For Combustion Air

 

PVC transition)

 

 

Cvent 8-in Wall Termination Kit (Combustion Air & Exhaust)

790004

 

 

 

 

 

Ø0.24” (Qty. 4)

 

 

 

31”

 

 

 

 

 

 

 

 

 

 

 

Ø7.89”

 

 

 

 

Ø12.2”

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Centrocerin lubricant

Interior Slip

 

Fit Wall Plate

(Material: Stainless Steel)

7

Rinnai CVent

8 INCH VENT COMPONENTS

CVent Elbow D8x90 degree

CVent Elbow D8x45 degree

CVent Elbow D8x90 degree

#790023

#790022 (Qty.2)

Vertical Support #790029

Inverter Coupeling Kit With Condensate Trap

CVent Extension D8xL18” #790020,

D8xL39” #790021

#790032

 

Combustion Air PVC Adapter Kit

#790037

CVent 8in Vent Rain Cap

CVent 8-in

CVent 8in Vent

Bracket #790024

Distancer #790031

#790034

 

 

CVent Flat Roof Flashing

#790002 CVent 8-in Chase Cover

#790030

CVent Pitched Roof Flashing (Including

Storm Collar) #790003

8

Rinnai CVent

4 INCH VENT COMPONENTS

CVent Extension

D4xL18 #790035

D4xL39 #790028

Sample Roof Assembly

OPTIONAL

CVent 8-in Rain Cap

#790034

NOTE: Use PVC adapter (illustrate above) at the combustion air header when transitioning to PVC

CVent 8-in Roof Termination Kit with PVC Adapter #790001

Cvent pitched roof moldable flashing #790003

9

Field Supplied

PVC Components

Field Supplied 8”

PVC Flashing

Rinnai CVent

Sample Horizontal Termination Assembly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Part Number:790020 / 790021

 

Part Number:790004

Part Number:790027

 

 

 

CVent Extension (Qty. 5)

 

Wall Termination Kit

CVent Elbow D4 x 90

 

 

 

Combustion Air & Exhaust (Qty 2)

 

 

(Qty. 2)

 

 

 

 

 

 

 

 

 

 

 

 

Field Supplied

PVC Components

Part Number: 790008

CVent Back-2-Back Kit (QTY. 4)

Part Number: 790005

CVent Starter Kit (Qty. 1)

Part Number:790037

Combustion Air PVC Adapter

Kit (Qty. 1)

Field Supplied

PVC Components

10

Rinnai CVent

Spare Parts List

Included

Part

 

 

With Kit

Description

Image

No.

No.

 

 

 

 

 

 

 

Exhaust Vent Components

 

790005

790042

CVent Endpiece

Ø8

 

 

 

 

 

790005

790048

Condensate Trap (32mm Connection)

 

 

 

 

 

790005

790049

Hose + 2 Clamps

 

 

 

 

 

790007

790040

Exhaust Collector, 1 connection, D8 x L20, D4 connection

Ø8

 

 

 

 

Ø4

 

 

 

 

 

 

 

Ø4

790008

790041

Exhaust Collector, 2 connections, D8 x L20, D4 connection

Ø8

 

 

 

 

 

 

Ø4

 

 

 

 

790007

 

 

Ø4

790035

CVent Extension, D4 x L18

 

790008

 

 

 

 

 

 

 

 

790007

790039

CVent Elbow D4 x 87degree with cleanout

 

790008

 

 

 

Ø4

 

 

 

 

 

 

 

 

 

Combustion Air Vent Components

 

790005

780046

Intake/Combustion Air Endpiece

Ø8

 

 

 

 

 

790007

780044

Combustion Air Collector, 1 connection, D8 x L20, D3 connection

Ø8

 

 

 

 

Ø3

 

 

 

 

 

 

 

Ø3

790008

780045

Combustion Air Collector, 2 connection, D8 x L20, D3 connection

Ø8

 

 

 

Ø3

 

 

 

 

 

 

 

Ø3

790007

 

 

Ø3

780050

CVent flex Line D3

 

790008

 

 

 

 

 

 

 

 

 

 

Appliance Adapter

 

 

 

 

Ø4

790007,

790038

CVent Appliance and Check Valve & hose (new!)

 

790008

 

 

 

 

 

 

 

Ø3

 

 

 

 

 

 

11

Rinnai CVent

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