Rinnai Common Vent System Brochure

Common Vent System

By Rinnai

8 Unit Back to Back Installation

Polypropylene (PP) Venting Components

Header Section

Vent Lengths and

Terminations

8 Unit Back to Back Installation

Two four unit back to back systems common vented with an extension between banks of units.

8 Unit In-Line Installation

This picture depicts units from the back of the product.

Header Section

Common Vent System

Installer qualifications: MUST be a licensed professional contractor to install Rinnai Common Vent systems. MUST read the Rinnai/Ubbink common vent installation manual completely before installing this product. This presentation does not serve as the official installation instructions or manual.

The Common Vent System is for use with the Rinnai Condensing Water Heater Model RU98i & REU-KB3237FFUD-US units ONLY.

Back to Back Configuration

In-line Configuration

Common Vent System

Common Vent System Advantages:

• Allows for longer vent runs.

• Reduces the number of roof or wall penetrations

• 100 foot equivalent vent length with up to seven units, forty one foot with eight.

• Polypropylene (PP) vent components, maximum temperatures range 230 ◦F.

• Available as In-Line or Back to Back configurations

• Capable of horizontal or vertical terminations

• Certified to ANS Z21.10.3 – CSA 4.3 standards

• Approved for U.S. installations up to 10,200 foot in elevation, not approved for Canada.

Common Vent System

Venting Guidelines - DO NOT:

• Do not install in separate distribution systems. All water heaters common vented must be in the same hot/cold plumbing manifolds, not to exceed eight units.

• Do not use PVC, CPVC, ABS or galvanized material for the exhaust vent, only polypropylene (PP) piping is approved.

• Do not combine vent components from different manufacturers.

• The exhaust/intake vent diameter must not be reduced.

• Do not connect the venting system with an existing vent or chimney.

• Do not common vent with the vent pipe of any other type of water heater or appliance.

• Do not install the water heater in an area of negative pressure.

• Do not install the water heater, venting or vent termination(s) in any areas where the air

may contain corrosion compounds or gasoline fumes.

Common Vent System

MUST DO:

• The water heater dip switch setting must be set to long vent on each unit (#1 switch in the set of tan dip switches set to the OFF).

• This water heater is a direct vent water heater and therefore is certified and listed with the vent system. You must use vent components that are certified and listed with water heater model.

• The vent system must vent directly to the outside of the building and use outside air for combustion.

• Avoid dips or sags in horizontal vent runs by installing supports per the vent manufacturer’s instructions.

• Support horizontal vent runs a minimum of every four foot and all vertical vent runs a

minimum of every six foot or in accordance with local codes.

Common Vent System

MUST DO, continue:

• Venting should be as direct as possible with a minimum number of pipe fittings.

• Vent connections must be firmly pressed together so that the gaskets form an airtight

seal.

• The air intake appliance adaptor connected to the water heater must be secured with one self‐tapping screw.

• Install an appliance adaptor which contains a check valve onto each water heater. Use only the check valve specified for the product. Do not attempt to build your own system. See picture of adaptor to the right.

• Check and clean the header check valve every 12 months according to the maintenance instructions in the venting instruction manual.

• Set the temperature setting on all water heaters being common vented to the same temperature.

Common Vent System

GENERAL INFORMATION:

• Unless recovering a large tank, Rinnai recommends installing an MSB controller when common venting and where water heaters are in a manifold system.

• Refer to the Ubbink manual for the vent system assembly instructions.

• Rinnai recommends replacing the check valve when replacing the water heater.

• IMPORTANT NOTE: In cold climates the exhaust termination will produce a large vapor

cloud. Consideration should be given as to a proper location of this terminal before installation of your exhaust termination. Place vent termination(s) in areas away from windows, doors or locations that a vapor cloud could be a nuisance.

• If you have any questions regarding the installation of this vent system , please contact Rinnai before proceeding.

Common Vent System

Minimum/Maximum Equivalent Vent Lengths & Altitude

In the table below you find the minimum/maximum equivalent pipe length of the

exhaust/intake venting.

• When determining equivalent exhaust and intake vent lengths add:

- 6 feet for each 90˚ elbow

- 3 feet for each 45˚ elbow

• Header kits have already been counted and do not need to be added.

• Add any vent extension lengths which are added within the header due to increased

spacing between separate racks of water heaters.

Numbers of Water Heaters Minimum Equivalent Vent Length Maximum Equivalent Vent Length

Exhaust Intake Exhaust Intake

1 to 7 5 ft. 15 ft. 100 ft. 100 ft.

8 5 ft. 15 ft. 41 ft. 41 ft.

Common Vent System

distance of 2 feet (61 cm) from

3 feet (91 cm) above if within

located

* For clearances not specified in ANSI Z223.1/NFPA 54,

codes and the requirements of the gas supplier.

[ 2 ] Permitted only if veranda, porch, deck or balcony is fully open on

)

Ref. Description Canadian Installations

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

B Clearance to window or door that may be opened 12 inches (30 cm) C Clearance to permanently closed window *

Vertical clearance to ventilated soffit, located above the

terminal within a horizontal D E Clearance to unventilated soffit * F Clearance to outside corner *

G Clearance to inside corner *

Clearance to each side of center line extended above

I Clearance to service regulator vent outlet *

Clearance to non-mechanical air supply inlet to building or

K Clearance to a mechanical air supply inlet

M Clearance under veranda, porch, deck or balcony *

the combustion air inlet to any other appliance 12 inches (30 cm)

Clearance above paved sidewalk or paved driveway

the center line of the terminal

meter/regulator assembly

on public property *

U.S Installations Only

U.S. Installations

10 feet (3 m) horizontally

[ 1 ] A vent shall not terminate directly above a sidewalk or paved

3/12/2014

driveway that is located between two single family dwellings and

serves both dwellings.

a minimum of three sides beneath the floor

clearances are in accordance with local installation

Clearance to opposite wall is 24 inches (61 cm

Common Vent System

The exhaust and intake terminations must follow these clearances: [1] 36 inch minimum vertically from bottom of exhaust termination to top

of intake termination, maximum 20 foot. [2] 12 inch minimum vertically from bottom of combustion air termination

to ground or highest anticipated snow line.

[3] There should be a minimum of 36 inches between exhaust terminations in multiple common vent installations.

[4] The vent (exhaust & combustion air) terminations must be in the same pressure zone and face the same direction.

[5] The intake termination must be at least 12 inches below and 36 inches away from the exhaust terminations, see shaded area in picture to the left.

NOTE: During colder weather when the exhaust temperature is much hotter than the outside air, the exhaust fumes condense producing water vapor. As a result a plume of water vapor may be seen leaving the exhaust.

Common Vent System

CVent Vertical Termination Clearances

Maintain a minimum of 36 inches between the exhaust and intake terminations in common vent installations.

Common Vent System

Additional Clearances:

Local codes supersede all clearances listed, please confirm before proceeding.

• Avoid termination locations near dryer vents

• Avoid terminations near commercial cooking exhaust hoods

The vent termination for this appliance shall not terminate:

• Over public walkways

• Near soffit 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 operation of appliance regulators, relief valves, or other equipment.

Common Vent System

Important considerations, locate vent termination under a soffit (ventilated or unventilated), eave vent, deck or porch.

• Do not install vent termination under a soffit vent such that exhaust can enter the soffit vent.

• Install vent termination such that exhaust and rising moisture will not collect under eaves. Discoloration to the exterior of the building could occur if installed too close.

• Do not install the vent termination too close under the soffit where it could present recirculation of exhaust gases back into the combustion air intake.

0.91 m between Terminals at different levels

36”

0.91 m between Terminals on same level

Common Vent System

Maintenance Clearances:

Follow the recommended minimum service clearances below for maintenance access to the header above the water

heater. If the vent system is to be enclosed it is suggested that the design of the enclosure shall permit annual inspection of

the vent system. The design of such enclosures shall be deemed acceptable by the installer or the local inspector.

Back to Back Configuration

Inline Configuration

Common Vent System

To combustibles inches

* 0 inches from vent components and condensate drain lines. The clearance

Water Heater Clearances

Follow the minimum clearances from water heater.

To Non- combustibles

Indoor model RU89i

Top of Heater * 6" (152) * 2" (51)

Back of Heater 0" (Zero) 0" (Zero)

Front of Heater 6" (152) 6" (152)

Sides of Heater 2" (51) 1/2" (13)

(mm)

inches (mm)

Bottom of Heater 12" (305) 12" (305)

Vent 0" (Zero) 0" (Zero)

for servicing is 24" in front of the water heater.

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