U.S. Boiler Company K2 Installation Instructions Manual

INSTALLATION INSTRUCTIONS

FOR

K2™

CONDENSING HIGH EFFICIENCY

DIRECT VENT

GAS - FIRED HOT WATER BOILER

9700609

As an ENERGY STAR

STAR® guidelines for energy efciency established by the United States Environmental Protection Agency (EPA).

Partner, U.S. Boiler Company has determined that the K2™ Series meets the ENERGY

WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage,

injury, or loss of life. For assistance or additional information, consult a qualied installer, service agency or the gas supplier. This boiler requires a special venting system. Read these instructions carefully before installing.

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Price - $5.00

IMPORTANT INFORMATION - READ CAREFULLY

NOTE: The equipment shall be installed in accordance with those installation regulations enforced in the area where the installation is to be made. These regulations shall be carefully followed in all cases. Authorities having jurisdiction shall be consulted before installations are made.

All wiring on boilers installed in the USA shall be made in accordance with the National Electrical Code and/or local regulations.

All wiring on boilers installed in Canada shall be made in accordance with the Canadian Electrical Code and/or local regulations.

The City of New York requires a Licensed Master Plumber supervise the installation of this product.

The Massachusetts Board of Plumbers and Gas Fitters has approved the K2™ Series boiler. See the Massachusetts Board of Plumbers and Gas Fitters website, http://license.reg.state.ma.us/pubLic/pl_products/pb_pre_form.asp for the latest Approval Code or ask your local Sales Representative.

The Commonwealth of Massachusetts requires this product to be installed by a Licensed Plumber or Gas Fitter.

The following terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important information concerning product life.

DANGER

Indicates an imminently hazardous situation

which, if not avoided, will result in death, serious injury or substantial property damage.

Indicates a potentially hazardous situation which,

if not avoided, may result in moderate or minor

injury or property damage.

CAUTION

NOTICE

WARNING

Indicates a potentially hazardous situation which,

if not avoided, could result in death, serious injury or substantial property damage.

Indicates special instructions on installation, operation, or maintenance which are important

but not related to personal injury hazards.

DANGER

Explosion Hazard. DO NOT store or use gasoline or other ammable vapors or liquids in the vicinity of this

or any other appliance.

If you smell gas vapors, NO NOT try to operate any appliance - DO NOT touch any electrical switch or use any phone in the building. Immediately, call the gas supplier from a remotely located phone. Follow the gas supplier’s instructions or if the supplier is unavailable, contact the re department.

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WARNING

Asphyxiation Hazard. This boiler requires regular maintenance and service to operate safely. Follow

the instructions contained in this manual.

Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Read and understand the entire manual before attempting installation, start-up operation, or service. Installation and service must be performed only by an experienced, skilled, and knowledgeable installer or service agency.

This boiler must be properly vented.

This boiler needs fresh air for safe operation and must be installed so there are provisions for adequate combustion and ventilation air.

Asphyxiation Hazard. The interior of the venting system must be inspected and cleaned before the start of the heating season and should be inspected periodically throughout the heating season for any obstructions. A clean and unobstructed venting system is necessary to allow noxious fumes that could cause injury or loss of life to vent safely and will contribute toward maintaining the boiler’s efciency.

Installation is not complete unless a safety relief valve is installed into the tapping located on left side

of appliance or the supply piping. - See the Water Piping and Trim Section of this manual for details.

This boiler is supplied with safety devices which may cause the boiler to shut down and not re-start without service. If damage due to frozen pipes is a possibility, the heating system should not be left unattended in cold weather; or appropriate safeguards and alarms should be installed on the heating system to prevent damage if the boiler is inoperative.

Burn Hazard. This boiler contains very hot water under high pressure. Do not unscrew any pipe ttings nor attempt to disconnect any components of this boiler without positively assuring the water is cool and has no pressure. Always wear protective clothing and equipment when installing, starting up or servicing this boiler to prevent scald injuries. Do not rely on the pressure and temperature gauges to determine the temperature and pressure of the boiler. This boiler contains components which become very hot when the boiler is operating. Do not touch any components unless they are

cool.

Respiratory Hazard. Boiler materials of construction, products of combustion and the fuel contain alumina, silica, heavy metals, carbon monoxide, nitrogen oxides, aldehydes and/or other toxic or harmful substances which can cause death or serious injury and which are known to the state of California to cause cancer, birth defects and other reproductive harm. Always use proper safety clothing, respirators and equipment when servicing or working nearby the appliance.

Failure to follow all instructions in the proper order can cause personal injury or death. Read all

instructions, including all those contained in component manufacturers manuals which are provided with the boiler before installing, starting up, operating, maintaining or servicing.

All cover plates, enclosures and guards must be in place at all times.

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Special Installation Requirements for Massachusetts

A. For all sidewall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes and where the sidewall exhaust vent termination is less than seven (7) ft. above grade, the

following requirements shall be satised:

1. If there is no carbon monoxide detector with an alarm already installed in compliance with the most current edition of NFPA 720, NFPA 70 and the Massachusetts State Building Code in the residential unit served by the sidewall horizontally vented gas fueled equipment, a battery operated carbon monoxide detector with an alarm shall be installed in compliance with the most current edition of NFPA 720, NFPA 70 and the Massachusetts State Building Code.

2. In addition to the above requirements, if there is not one already present, a carbon monoxide detector with an alarm and a battery back-up shall be installed and located in accordance with the installation requirements supplied with the

detector on the oor level where the gas equipment is installed. The carbon monoxide detector with an alarm shall

comply with 527 CMR, ANSI/UL 2034 Standards or CSA 6.19 and the most current edition of NFPA 720. In the event that the requirements of this subdivision can not be met at the time of the completion of the installation of the equipment, the installer shall have a period of thirty (30) days to comply with this requirement; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed in compliance with the most current edition of NFPA 720, NFPA 70 and the Massachusetts State Building Code. In the event that the sidewall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the carbon monoxide detector

may be installed on the next adjacent habitable oor level. Such detector may be a battery operated carbon monoxide

detector with an alarm and shall be installed in compliance with the most current edition of NFPA 720, NFPA 70 and the Massachusetts State Building Code.

3. A metal or plastic identication plate shall be permanently mounted to the exterior of the building at a minimum

height of eight (8) ft. above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.

4. A nal inspection by the state or local gas inspector of the sidewall horizontally vented equipment shall not be performed

until proof is provided that the state or local electrical inspector having jurisdiction has granted a permit for installation of carbon monoxide detectors and alarms as required above.

B. EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a) 1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54 as adopted by the Board; and

2. Product Approved sidewall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential purposes.

C. When the manufacturer of Product Approved sidewall horizontally vented gas equipment provides a venting system design or venting system components with the equipment, the instructions for installation of the equipment and the venting system shall include:

1. A complete parts list for the venting system design or venting system; and

2. Detailed instructions for the installation of the venting system design or the venting system components.

D. When the manufacturer of a Product Approved sidewall horizontally vented gas fueled equipment does not provide the

parts for venting ue gases, but identies “special venting systems”, the following shall be satised:

1. The referenced “special venting system” instructions shall be included with the appliance or equipment installation instructions; and

2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include a parts list and detailed installation instructions.

E. A copy of all installation instructions for all Product Approved sidewall horizontally vented gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the installation.

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WARNINGS FOR THE HOMEOWNER

FOLLOW ALL INSTRUCTIONS and warnings printed in this manual and posted on the boiler.

MAINTAIN THE BOILER. To keep your boiler safe and efficient, have a service technician maintain this boiler as specified in Service and Maintenance manual.

IF YOU ARE NOT QUALIFIED to install or service boilers, do not install or service this one.

THE BOILER MAY LEAK WATER at the end of its useful life. Be sure to protect walls, carpets, and valuables from water that could leak from the boiler.

PROTECT YOUR HOME IN FREEZING WEATHER. A power outage, safety lockout, or component failure will prevent your boiler from lighting. In winter, your pipes may freeze and cause extensive property damage. Do not leave the heating system unattended during cold weather

unless alarms or other safeguards are in place to prevent such damage

DO NOT BLOCK AIR FLOW into or around the boiler. Insufficient air may cause the boiler to produce carbon monoxide or start a fire.

KEEP FLAMMABLE LIQUIDS AWAY from the boiler, including paint, solvents, and gasoline. The boiler may ignite the vapors from the liquids causing explosion or fire.

KEEP CHILDREN AND PETS away from hot surfaces of the boiler, boiler piping, vent piping and vent terminals.

CARBON MONOXIDE (CO) is an odorless, deadly gas that may be introduced into your home by any malfunctioning fuel-burning product or vent system failure. Consider installing CO alarms near bedrooms in all levels of the building to warn you and your family of potential CO exposure.

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Table of Contents

I. Product Description 7

II. Specications 7

III. Before Installing 8

IV. Locating The Boiler 9

V. Mounting The Boiler 11

VI. Air For Ventilation 14

VII. Venting 15

A. Vent System Design 15

B. Design Requirements Unique to Horizontal Twin Pipe

Venting Systems 21

C. Design Requirements Unique to Vertical Venting Systems 27

D. Design Requirements Unique to Split Vent Systems 35

E. Assembly of CPVC/PVC Vent Systems 43

F. Assembly of DuraVent PolyPro Vent Systems 50

G. Assembly of Selkirk Polyue Vent Systems 55

H. Assembly of Centrotherm InnoFlue Vent Systems 59

I. Condensate Trap and Drain 63

J. Removing An Existing Boiler From Common Chimney 64

VIII. Gas Piping 65

IX. System Piping 67

A. General System Piping Precaution 67

B. Near Boiler Piping Design 68

C. Standard Piping Installation Requirements 76

D. Piping For Special Situations 78

X. Wiring 79

XI. Start-Up and Checkout 89

Appendix A: LP Gas Conversion Instructions 96

Appendix B: Instructions for High Altitude Installations Above 2000 ft. 99

Appendix C: Special Requirements For Side-Wall Vented Appliances In The Commonwealth of Massachusetts 102

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I. Product Description

This boiler is a stainless steel gas red condensing boiler designed for use in forced hot water heating systems requiring

supply water temperatures of 180°F or less. It is designed for installation on a wall. This boiler may be vented vertically or horizontally with combustion air supplied from outdoors. It is not designed for use in gravity hot water systems or systems

containing signicant amounts of dissolved oxygen.

II. Specications

SEE TABLE 2.3

16-5/8

OUTSIDE

OF WALL

RETURN WATER

CONNECTION

"A"

DRAIN VALVE

INSIDE

OF WALL

SERVICE ACCESS

PANEL

29-1/16

TEMPERATURE/

PRESSURE GAUGE

SUPPLY WATER

CONNECTION

VENT

CONNECTION

RELIEF

VALVE

GAS

CONNECTION

AIR INTAKE

CONNECTION

CONTROL

ACCESS

PANEL

CONDENSATE CONNECTION

CONDENSATE

TRAP CLEANOUT

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Figure 2.1: General Conguration

Table 2.2: Specications

Model

Nominal

Vent/Intake Size

(in)

Min Vent Length

(in)

Max Vent Length

Approx.

Derate at Max Vent

(%)

K2-080 2 12 60 ft 9

K2-080 3 12 135 ft 2

K2-100 2 12 60 ft 15

K2-100 3 12 135 ft 3

K2-120 3 12 135 ft 7

K2-150 3 52 135 ft 7

K2-180 3 52 135 ft 9

See Section VII (Venting) for additional requirements and details.

II. Specications (continued)

Maximum

Model*

Input

(MBH)

K2-080 80 16 74 64 0.36 17” 1” 1/2” 100

K2-100 100 20 92 80 0.44 17” 1” 1/2” 102

K2-120 120 24 111 97 0.53 17” 1” 1/2” 105

K2-150 150 30 141 123 0.79 21” 1” 1/2” 119

K2-180 180 36 167 145 0.79 21” 1” 1/2” 119

* The Net AHRI Water Ratings shown are based on a piping and pickup allowance of 1.15. The manufacturer should be consulted before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation,

extensive piping systems, etc.

Minimum

Input

(MBH)

D.O.E.

Heating

Capacity

(MBH)

AHRI Net

Rating *

(MBH)

Water

Volume

(gal.)

Supply & Return

Dim.

“A”

Connection

Size (NPT)

Gas Connection

Size (NPT)

Approx.

Net

Weight

(lb.)

Table 2.3: Vent Lengths

III. Before Installing

1. Safe, reliable operation of this boiler depends upon installation by a professional heating contractor in strict accordance with this manual and the requirements of the authority having jurisdiction.

• In the absence of an authority having jurisdiction, installation must be in accordance with this manual

and the National Fuel Gas Code, ANSI Z223.1. In Canada, installation must be in accordance with the B149.1 Installation Code.

• Where required by the authority having jurisdiction, this installation must conform to the Standard for Controls

and Safety Devices for Automatically Fired Boilers (ANSI/ASME CSD-1).

2. Read Section VII to verify that the maximum combustion air and exhaust pipe lengths will not be exceeded in the planned installation. Also verify that the vent terminal can be located in accordance with Section VII.

3. Make sure that the boiler is correctly sized:

• For heating systems employing convection radiation (baseboard or radiators), use an industry accepted sizing

method such as the I=B=R Guide RHH published by the Air-Conditioning, Heating and Refrigeration Institute (AHRI).

• For new radiant heating systems, refer to the radiant tubing manufacturer’s boiler sizing guidelines.

• For system which includes an indirect water heater, make sure the boiler has the output called for by the indirect

water heater manufacturer’s instructions.

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III. Before Installing (continued)

4. All boilers are shipped from the factory congured for use with natural gas. They may be converted for use with LP gas

(“propane”) using a combustion analyzer in accordance with the instructions in Appendix A.

DANGER

• Do not attempt to operate this boiler on LP gas without converting it in accordance with the instructions

shown in Appendix A.

• Do not attempt to convert this boiler to LP gas without the use of a combustion analyzer.

• Failure to follow the conversion instructions in Appendix A will result in operation of the boiler at unsafe Carbon Monoxide (CO) levels and may result in personal injury or loss of life. Improper conversion may also result in unreliable operation, resulting in property damage.

• Before attempting to operate this boiler at altitudes above 2000 ft., follow instructions shown in

Appendix B of this manual.

NOTICE

This product must be installed by a licensed plumber or gas tter when installed within the Commonwealth of Massachusetts. See Appendix C for additional important information about installing

this product within the Commonwealth of Massachusetts.

IV. Locating the Boiler

1. Observe the minimum clearances shown in Figure 4.1. These clearances apply to combustible construction as well as

non-combustible walls, oors, ceilings and doors.

2. Note the recommended service clearances in Figure 4.1. These service clearances are recommended, but may be reduced to the combustible clearances provided:

a. Access to the front of the boiler is provided through a door.

b. Access is provided to the condensate trap located beneath the boiler.

Note that servicing the boiler will become increasingly difcult as these service clearances are reduced.

3. Observe the following clearances from piping to combustible construction:

Non-concentric vent (exhaust): ¼”

Air intake piping: 0”

Hot water piping: ¼”

4. The relief valve and gauge must be installed in the location shown in Figure 2.1 and must be in the same space as the boiler.

5. The boiler should be located so as to minimize the length of the vent system.

6. The combustion air piping must terminate where outdoor air is available for combustion and away from areas that will

contaminate combustion air. Avoid areas near chemical products containing chlorine, chloride based salts, chloro/uoro

carbons, paint removers, cleaning solvents and detergents.

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IV. Locating the Boiler (continued)

Figure 4.1: Minimum Clearances To Combustible Construction

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V. Mounting The Boiler

A. Wall Mounting

CAUTION

This boiler weighs as much as 119 pounds:

• Two people are required to safely lift this boiler onto the wall mounting hook.

• Make sure that wall mounting hook is anchored to a structure capable of supporting the weight of the boiler and attached piping when lled with water. Jurisdictions in areas subject to earthquakes may have special requirements for supporting this boiler. These local requirements take precedence over the requirements shown below.

1. If the boiler is installed on a framed wall, minimum acceptable framing is 2 x 4 studs on 16” centers. The boiler mounting holes are on 16” centers for installation between two studs at the standard spacing. In cases where the boiler cannot be centered between the studs, or where the studs are spaced closer than 16” apart, the boiler may be anchored

to ¾” plywood or horizontal 2 x 4’s anchored to the studs.

2. 5/16” x 2” lag screws and washers are provided for mounting this boiler. These lag screws are intended for mounting the boiler directly onto studs covered with ½” sheathing. When the boiler is attached to other types of construction, such as masonry, use fasteners capable of supporting the weight of the boiler and attached piping in accordance with good construction practice and applicable local codes.

3. Make sure that the surface to which the boiler is mounted is plumb.

4. Before mounting the boiler, make sure that wall selected does not have any framing or other construction that will interfere with the vent pipe penetration.

5. Once a suitable location has been selected for the boiler, and any needed modications have been made to the wall, use

Figure 5.1 to locate holes “A” and “B”. Make sure that the horizontal centerline of these holes is level. Holes “C” and “D” may also be drilled at this time or after the boiler is hung on the wall. If the 5/16” x 2” lag screws are used, drill 3/16” pilot holes.

6. The wall mounting hook is used to secure the boiler to the shipping pallet. Remove this hook from the pallet and secure to the wall using the 5/16” x 2” lag screws and washers, or other suitable anchors as appropriate (Figure 5.2). Make sure the hook is level.

7. Hang the boiler on the wall hook as shown in Figure 5.2.

8. If not already done in Step (5) locate and drill holes “C” and “D” using the obround slots in the bottom mounting

ange. Secure the bottom ange to the wall using the 5/16”x 2” lag screws, or other fasteners as appropriate (Figure

5.2).

9. Verify that the front of the boiler is plumb. If it is not, install washers at holes “C” and “D” between the bottom

mounting ange and the wall to adjust.

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Figure 5.1 Wall Layout/Mounting Hole Location

V. Mounting The Boiler (continued)

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Figure 5.2 Boiler Mounting Bracket Installation / Boiler Wall Mounting

V. Mounting The Boiler (continued)

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VI . Air for Ventilation

WARNING

Outdoor combustion air must be piped to the air intake. Never pipe combustion air from areas containing contaminates such as swimming pools and laundry room exhaust vents. Contaminated combustion air will damage the boiler and may cause property damage, personal injury or loss of life.

Air for combustion must always be obtained directly from outdoors. See Section VII for intake piping. Adequate air

for ventilation will be present if the clearances specied in this manual are maintained. If this boiler is installed in a room with other appliances, provide adequate air for combustion and/or ventilation air in accordance with the manufacturer’s

installation manual or applicable code.

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VII. Venting

WARNING

Asphyxiation Hazard. Failure to vent this boiler in accordance with these instructions could cause products of combustion to enter the building resulting in severe property damage, personal injury or

death.

Do not interchange vent systems or materials unless otherwise specied. The use of thermal insulation covering vent pipe and ttings is prohibited. Do not use a barometric damper, draft hood or vent damper with this boiler. When using the CPVC/PVC vent option, the use of CPVC is required when venting in vertical or

horizontal chase ways.

Any CPVC vent materials supplied with this boiler do not comply with B149.1.S1-07 and are not approved for use in Canadian jurisdictions that require vent systems be listed to ULC S636-2008. In these jurisdictions, vent this boiler using a listed ULC S636 Class IIB venting system.

Do not locate vent termination where exposed to prevailing winds. Moisture and ice may form on surface around vent termination. To prevent deterioration, surface must be in good repair (sealed, painted, etc.).

Do not locate air intake vent termination where chlorines, chlorouorocarbons (CFC’s), petroleum distillates, detergents, volatile vapors or other chemicals are present. Severe boiler corrosion and

failure will result.

The use of cellular core PVC (ASTM F891), cellular core CPVC or Radel (polyphenolsulfone) is prohibited.

Do not locate vent termination under a deck. Do not reduce specied diameters of vent and combustion air piping. When installing vent pipe through chimney, as a chase, no other appliance can be vented into the

chimney.

Do not allow low spots in the vent where condensate may pool.

A. Vent System Design

There are three basic ways to vent this boiler:

• Horizontal (“Side Wall”) Twin Pipe Venting (Figure 7.0a) - Vent system exits the building through an outside wall. Combustion air and ue gas are routed between the boiler and the terminal(s) using separate pipes for at least part of the

way. A summary of Horizontal Twin Pipe venting options is shown in Table 7.5.

• Vertical Twin Pipe Venting (Figure 7.0b) - Vent system exits the building through a roof. Combustion air and ue gas

are routed between the boiler and the terminal(s) using separate pipes for at least part of the way. A summary of Vertical Twin Pipe venting options is shown in Table 7.13

• Split Venting (Figure 7.0c) - Exhaust system exits the building through a roof, and combustion air is drawn from a terminal mounted on the side wall. A summary of split venting options is shown in Table 7.21

All of these systems are considered “direct vent” because the air for combustion is drawn directly from the outdoors into the

boiler. One of the vent option columns in Tables 7.5, 7.13, 7.21 must match the planned vent and air intake system exactly.

Design details applying to all vent systems are shown in this section. Observe all design requirements in this section, as well as

those unique to the type of system being installed:

• B - Design Requirements Unique to Horizontal Twin Pipe Vent Systems

• C - Design Requirements Unique to Vertical Twin Pipe Vent Systems

• D - Design Requirements Unique to Split Vent Systems

1. Approved Vent Systems and Materials – The following materials and vent systems may be used to vent this boiler:

• CPVC – Use only CPVC listed to ASTM F441. In Canada, this pipe must also be listed to ULC S636.

• PVC – PVC may be used only as permitted in this manual. All PVC must be listed to ASTM D2665. At least 30” of CPVC pipe, and at least one CPVC elbow, must be installed between the boiler’s vent connection and the PVC pipe. Use of

foam core PVC is not permitted for venting. PVC vent pipe may not be used to vent this boiler in Canada.

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VII. Venting A. Vent System Design (continued)

Figure 7.0a: Horizontal Twin Pipe

Figure 7.0b: Vertical Twin Pipe

Figure 7.0c: Split Venting

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VII. Venting A. Vent System Design (continued)

• DuraVent PolyPro - ULC S636 listed Polypropylene special gas vent system. Use of ex piping is not permitted.

• Selkirk Polyue - ULC S636 listed Polypropylene special gas vent system.

• Centrotherm InnoFlue SW - ULC S636 listed Polypropylene special gas vent system. Use of ex piping is not permitted.

Use PVC and/or CPVC for the air intake system. PVC may be used for all air intake piping between the intake terminal

and the boiler.

When CPVC and/or PVC pipe is used, it must be joined using primer and cement that is listed for use with the pipe

material being joined (PVC, CPVC, or CPVC to PVC).

2. Vent Components Supplied with this Boiler – This boiler is supplied with some of the components needed for 3” CPVC/PVC venting (Vent Option 2). A list of these components is supplied in Table 7.26. Components not supplied may be procured locally. The CPVC Pipe and elbow supplied with this boiler are not listed to ULC S636 and may not be used in Canada.

3. Maximum Vent and Air Intake Lengths - The maximum length of the vent air intake piping depends upon the vent option selected and the boiler size. See Tables 7.5, 7.13 or 7.21 for the maximum vent lengths. These maximum lengths apply to both the vent and intake piping (e.g. Option 1 may have up to 60ft of intake and 60ft of vent piping). For all vent

systems, the lengths shown in Tables 7.5, 7.13 and 7.21 are in addition to the rst 90° elbow. If more elbows are desired,

the maximum allowable vent length must be reduced by the amount shown in Table 7.1 for each additional elbow used.

Termination ttings are never counted.

The elbows supplied with the boiler are “standard radius” elbows. It is recommended that all eld supplied PVC

or CPVC elbows be “1/4 Bend” (Sanitary 90° El) or “Long Sweep 1/4 Bend” type elbows (Figure 7.2). In this manual “sanitary” and “long sweep” elbows are treated as having the same equivalent length.

Example: A 3” twin pipe horizontal CPVC/PVC vent system is planned for a horizontally vented 120MBH model which has the

following components in the vent system:

• 1 ft CPVC Straight Pipe

• 90 CPVC Elbow (short bend)

• 1-1/2 ft CPVC Straight Pipe

• Coupling

• 10 ft PVC Straight Pipe

• 90 PVC Elbow (Sanitary Elbow Design)

• 15 ft PVC Straight Pipe

• PVC Coupling Terminal

The Vent Option #2 column in Table 7.5 describes a horizontal direct vent system using 3” CPVC and PVC pipe. From this

column,weseethattheboilermayhaveaventlengthofupto135ft.TherstCPVC90degreeelbowisnotconsidered.From

Table 7.1, we see that the equivalent length of the 90 PVC elbow is 4ft and that the equivalent length of the coupling is 0ft. The total equivalent length of the planned venting system is therefore:

1ft(StraightCPVC)+0ft(rstshortbendCPVC90Elbow)+1.5ft(StraightCPVC)+0ft(Coupling)+10ft(StraightPVC)

+ 4ft (PVC 90 Sanitary Elbow) + 15ft (Straight PVC) + 0ft (Coupling Terminal) = 31.5ft.

Since Table 7.1 shows a maximum allowable vent length of 135ft, the planned vent system length is acceptable

The ex venting used on some of the Vertical Twin Pipe and Split Vent Options also reduces the maximum allowable vent

length. See Sections VII-C or VII-D for details.

NOTICE

Do not exceed maximum vent/combustion air system length. Refer to Tables 7.1 and 7.13 in this section for maximum vent/combustion air system length.

Use only vent and combustion air terminals and terminal locations shown in Tables 7.1 and 7.13 and

related Figures in this section.

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VII. Venting A. Vent System Design (continued)

4. Minimum Vent and Air Intake Lengths - Observe the minimum vent lengths shown in Tables 7.1, 7.13 and 7.21.

5. Clearances to Combustibles - Maintain the following clearances from the vent system to combustible construction:

• Vent - 1/4” (also observe clearances through both combustible and non-combustible walls - see 9 below)

• Air Intake - 0”

• Concentric Portion of Concentric Terminals - 0”

6. Pitch of Horizontal Vent Piping - Pitch all horizontal vent piping so that any condensate which forms in the piping will run towards the boiler.

• Pitch CPVC/PVC vent piping 1/4” per foot.

• Pitch Polypropylene vent piping 5/8” per foot.

Les chaudières de catégories I, II et IV doivent présenter des tronçons horizontaux dont la pente montante est d’au moins 5/8 po par pied (52 mm/m) entre la chaudière et l’évent.

Table 7.1: Vent/ Air Intake Fitting Equivalent Length

CPVC/PVC Fitting Equivalent Length (ft)

2” 90° Elbow (“Sanitary Bend”) 2.6 2” 90° Elbow 4.5

3” 90° Elbow (“Sanitary Bend”) 4.0 3” 90° Elbow 8.7

2” 90° Elbow (“Short Bend” ) 6.0 2” 90° Elbow 2.5

3” 90° Elbow (“Short Bend”) 10.0 3” 45° Elbow 4.6

2” 45° Elbow 1.5

3” 45° Elbow 2.0

2” Coupling 0.0

3” Coupling 0.0

PolyPro, Polyue or InnoFlue

Vent Fitting

Equivalent Length (ft)

Figure 7.2: CPVC and PVC Elbows

105294-05 - 5/15

VII. Venting A. Vent System Design (continued)

7. Supporting Pipe - Vertical and horizontal sections of pipe must be properly supported. Maximum support spacing is as

follows:

• Support CPVC/PVC horizontally and vertically every 4 feet.

• Support DuraVent PolyPro horizontally near the female end of each straight section of pipe and vertically every 10 feet.

• Support Centrotherm InnoFlue horizontally every 39 inches with additional supports at elbows and vertically every 78”.

• Support 2” Selkirk Polyue horizontally every 30”. Support 3” Polyue horizontally every 39”. Support vertical runs of both 2” and 3” Polyue every 16 ft.

Les instructions d´installation du système d´évacuation doivent préciser que les sections horizontales doivent être

supportées pour prévenir le échissement. Les méthodes et les intervalles de support doivent être spéciés. Les

instructions divent aussi indiquer les renseignements suivants:

• les chaudières de catégories II et IV doivent être installées de façon à empêcher l´accumulation de condensat: et

• si nécessaire, les chaudières de catégories II et IV doivent être pourvues de dispositifs d´évacuation du condensat.

8. Allowing for Thermal Expansion -

• For CPVC/PVC pipe design the vent system to allow 3/8” of thermal expansion for every 10ft of CPVC/PVC pipe.

The boiler will always act as an anchor to one end of the vent system. If at all possible, select and install hangers and wall thimbles so that the vent system can expand towards the terminal. When a straight run of pipe exceeds 20ft and must be restrained at both ends, an offset or expansion loop must be provided (Figures 7.3a, 7.3b). When a straight horizontal run of pipe exceeds 20ft and is restrained at one end with an elbow at the other, avoid putting a hanger or

guide less than “Y” inches from the elbow in the adjoining straight section (Figure 7.3c). Thermal expansion ttings

are not permitted.

• When properly assembled expansion of PolyPro, Polyue and InnoFlue vent systems is accommodated at the joints. See

Part VII-F, G & H of this manual for details.

9. Running PVC Vent Pipe Inside Enclosures and Through Walls - PVC vent pipe must be installed in a manner that permits adequate air circulation around the outside of the pipe:

• Do not enclose PVC venting - Use CPVC in enclosed spaces, even if PVC is installed upstream.

• PVC venting may not be used to penetrate combustible or non-combustible walls unless all of the following conditions are

met:

a. The wall penetration is at least 66 inches from the boiler as measured along the vent.

b. The wall is 12” thick or less

c. An airspace of at least that shown in Figure 7.4 is maintained around the OD of the vent.

If any of these conditions cannot be met, use CPVC for the wall penetration.

10. Vent Manufacturer’s Instructions – The vent system manufacturer may have additional vent system design requirements.

Read and follow the vent manufacturer’s instructions in addition to those shown here. Where a conict arises between the

two sets of instructions, the more restrictive requirements shall govern.

105294-05 - 5/15

VII. Venting A. Vent System Design (continued)

Figure 7.3bFigure 7.3a

Figure 7.3c

Figure 7.3: Expansion Loops for CPVC/PVC Pipe

Figure 7.4: Wall Penetration Clearances for PVC Vent Pipe

105294-05 - 5/15

VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)

B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems

Table 7.5 summarizes all horizontal twin pipe vent options. Illustrations of horizontal twin pipe vent systems are shown in

Figures 7.6 – 7.10. In addition to the requirements in Part VII-A, observe the following design requirements:

1. Permitted Terminals for Horizontal Venting:

Terminal Option A: Fittings (Acceptable for Vent Options 1-8) – Vent terminates in a plain end (coupling for PVC, bell

end for PolyPro, Polyue and plain end pipe for InnoFlue). Intake terminates in a PVC 90 sweep elbow pointing down.

Outer edge of both terminals must be within 10” of the wall surface (Figures 7.6, 7.9). The section of DuraVent PolyPro,

Centrotherm InnoFlue or Selkirk Polyue exposed to the outdoors must be UV resistant.

Use of rodent screens is generally recommended for both terminations. Two rodent screens suitable for 3” PVC terminals are

supplied with the boiler and are installed as shown in Figure 7.28. If 2” CPVC is used, these screens can be cut to t into the smaller ttings. Rodent screens (“bird guards”) for PolyPro, InnoFlue and Polyue are as follows:

Size/Vent System Rodent Screen (“Bird Guard”)

2” PolyPro DuraVent # 2PPS-BG 3” PolyPro DuraVent # 3PPS-BG

2” Polyue Selkirk # 2PF-HVST 3” Polyue Selkirk # 3PV-HVST

2” InnoFlue Centrotherm # IASPP02 3” InnoFlue Centrotherm # IASPP03

If necessary to achieve required clearance above grade, CPVC or CPVC/PVC vent systems may be terminated using ttings

on snorkels as shown in Figure 7.12. When this is done, the equivalent length of all pipe on the exterior of the building,

except for the terminal ttings themselves, must be counted when calculating the equivalent length. The maximum vertical run of the snorkel is 7 feet. Brace both the vent and inlet piping if required. PolyPro, InnoFlue and Polyue may not be

snorkeled.

Terminal Option B: Ipex Low Prole Terminal (Acceptable for Vent Options 1,2) – This terminal is shown in Figure 7.7. If the terminal is oriented vertically (alternate orientation shown in Fig 7.7) the exhaust opening must be on the top as shown. See Part VII-E of this manual and the Ipex instructions provided with the terminal, for installation details.

Terminal Option C: DiversiTech “Low Prole” Terminal (Acceptable for Vent Options 1,2) – This terminal is shown in Figure 7.7. If the terminal is oriented vertically (alternate orientation shown in Fig 7.7) the exhaust opening must be on the top as shown. See Part VII-E of this manual and the DiversiTech instructions provided with the terminal, for installation details.

Terminal Option D: Ipex FGV Concentric Terminal (Acceptable for Vent Options 1,2) - This terminal is shown in Figure 7.8 and may be used with CPVC/PVC vent systems. This terminal is available in various lengths and in both PVC and CPVC. Terminals acceptable for use with these vent options are as follows:

Ipex PN FGV Concentric Terminal Description

196005 2 x 16” PVC 196105 2 x 28” PVC 196125 2 x 40” PVC 196006 3 x 20” PVC 196106 3 x 32” PVC 196116 3 x 44” PVC 197107 3 x 32” CPVC 197117 3 x 44” CPVC

See Part VII-E of this manual and the Ipex instructions provided with the terminal, for installation details.

Terminal Option E: DiversiTech Concentric Terminal (Acceptable for Vent Options 1,2) - This terminal is shown in Figure

7.8 and may be used with CPVC/PVC vent systems. See Part VII-E of this manual and the DiversiTech instructions provided with the terminal, for installation details.

Terminal Option F: DuraVent PolyPro Concentric Terminal (Acceptable for Vent Options 3,4) - This terminal is shown in Figure 7.10 and may be used with DuraVent 2” or 3” PolyPro vent systems. See Part VII-F of this manual and the DuraVent instructions provided with the terminal, for installation details.

105294-05 - 5/15

VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)

Table 7.5: Summary of Horizontal Twin Pipe Venting Options

Vent Option 1 2 3 4 5 6 7 8

Illustrated in Figure

Pipe Penetration

through

Structure

Material

Nominal Diameter

Min Equivalent Vent Length:

Models

Max Equivalent Vent Length (Note 1):

Models

Terminal

Vent Wall Wall Wall Wall Wall Wall Wall Wall

Intake Wall Wall Wall Wall Wall Wall Wall Wall

Vent

Intake PVC PVC PVC PVC PVC PVC PVC PVC Vent 2” 3” 2” 3” 2” 3” 2” 3” Intake 2” 3” 2” 3” 2” 3” 2” 3”

K2-080 12” 12” 12” 12” 12” 12” 12” 12” K2-100 12” 12” 12” 12” 12” 12” 12” 12” K2-120

K2-150 52” 52” 52” 52”

K2-180 52” 52” 52” 52”

K2-080 60ft 135ft 60ft 135ft 60ft 135ft 60ft 135ft

K2-100 60ft 135ft 60ft 135ft 60ft 135ft 60ft 135ft

K2-120 K2-150 135ft 135ft 135ft 135ft K2-180 135ft 135ft 135ft 135ft

Vent

Option A

(Fittings)

Intake

Terminal Option B

(Ipex Low Prole)

Terminal Option C

(DiversiTech HVENT)

Terminal Option D

(Ipex FGV Concentric)

Terminal Option E

(DiversiTech CVENT)

Terminal Option F

(DuraVent Horizontal

Concentric)

7.6, 7.7,

7.8

CPVC/

PVC

(Note 2)

Not

Permitted

Not

Permitted

Coupling

w/screen

(Note 3)

Elbow

w/screen

(Note 3)

Ipex #

196984

HVENT-2 HVENT-3

Ipex

196105

CVENT-2 CVENT-3

Not

Permitted

7.6, 7.7,

7.8

CPVC/

PVC

(Note 2)

12”

135ft

Coupling

w/screen

(Note 3)

Elbow

w/screen

(Note 3)

Ipex

#196985

Ipex

196006

Not

Permitted

7.9, 7.10 7.9, 7.10 7.9 7.9 7.9 7.9

DuraVent

PolyPro

(Rigid)

Not

Permitted

Not

Permitted

2PPS-12B

2PPS-36B

w/screen

Elbow

w/screen

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

2PPS-HK 3PPS-HK

DuraVent

PolyPro

(Rigid)

12”

135ft

3PPS-12B

3PPS-36B

w/screen

Elbow

w/screen

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

Selkirk

Polyue

Not

Permitted

Not

Permitted

2PF-10UV

2PF-39UV

w/screen

Elbow

w/screen

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

Selkirk

Polyue

12”

135ft

3PF-10UV

3PF-39UV

w/screen

Elbow

w/screen

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

Centro-

therm

InnoFlue

Not

Permitted

Not

Permitted

ISEP02 or ISEP0239

w/screen

Elbow

w/screen

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

Not

Permitted

Centro-

InnoFlue

ISEP03 or ISEP0339

w/screen

Permitted

therm

12”

135ft

Elbow

Not

Notes:

1. Max vent lengths shown also apply to the intake. For example, Vent Option #1 may have up to 60ft of vent pipe and also up to 60 ft of intake pipe.

2. First 30” of vent and vent Elbow connected to boiler must be CPVC. Downstream vent pipe can be PVC except as noted in text.

3. PVC Terminal coupling and inlet elbow may be offset on snorkels as shown in Figure 7.12.

105294-05 - 5/15

VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)

2. Horizontal Vent and Air Intake Terminal Location - Observe the following limitations on the vent terminal location (also see Figure 7.11). When locating a concentric terminal, observe the limitations outlined below for “vent terminals”.

• Vent terminal must be at least 1 foot from any door, window, or gravity inlet into the building.

• When Terminal Option A (ttings) are used, maintain the correct clearance and orientation between the intake

and exhaust terminals. If possible, locate vent and combustion air terminals on the same wall to prevent nuisance shutdowns. If not, boiler may be installed with roof vent terminal and sidewall combustion air terminal (see Section D). When installed on the same wall, locate exhaust vent terminal at same height or higher than combustion air intake terminal. Horizontal separation: Recommended: 36”, Minimum: 12”, Maximum: none. Minimum horizontal separation of 12” is required regardless of vertical separation.

• The bottom of all terminals must be at least 12” above the normal snow line. In no case should they be less than 12”

above grade level.

• The bottom of the vent terminal must be at least 7 feet above a public walkway.

• Do not install the vent terminal directly over windows or doors.

• The bottom of the vent terminal must be at least 3 feet above any forced air inlet located within 10 feet.

• USA Only: A clearance of at least 4 feet horizontally must be maintained between the vent terminal and gas meters,

electric meters, regulators, and relief equipment. Do not install vent terminal over this equipment. In Canada, refer to B149.1 Installation Code for clearance to meters, regulators and relief equipment.

• Do not locate the vent terminal under decks or similar structures.

• Top of terminal must be at least 24” below ventilated eves, softs and other overhangs. In no case may the overhang

depth exceed 48”. Where permitted by the authority having jurisdiction and local experience, the terminal may be located closer to unventilated softs. For the minimum vertical separation which depends upon the depth of the soft, see Figure 7.11.

• Vent terminal must be at least 6 feet from an inside corner.

• Under certain conditions, water in the ue gas may condense, and possibly freeze, on objects around the vent terminal including on the structure itself. If these objects are subject to damage by ue gas condensate, they should be moved or

protected.

• Install the vent and air intake terminals on a wall away from the prevailing wind. Reliable operation of this boiler

cannot be guaranteed if these terminals are subjected to winds in excess of 40 mph.

• Air intake terminal must not terminate in areas that might contain combustion air contaminates, such as near

swimming pools. See WARNING on page 15.

Figure 7.6: Horizontal CPVC/PVC Venting, (Vent Options #1 & 2, Terminal Option A)

105294-05 - 5/15

VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)

Figure 7.7: Horizontal CPVC/PVC Venting with Low Prole Terminal,

(Vent Options #1 & 2, Terminal Options B & C)

Figure 7.8: Horizontal CPVC/PVC Venting with Concentric Vent Terminal,

(Vent Options #1 & 2, Terminal Options D & E)

105294-05 - 5/15

VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)

Figure 7.9: Duravent PolyPro, Selkirk, Polyue or Centrotherm InnoFlue Horizontal Venting

(Vent Option #3 - 8, Terminal Option A)

Figure 7.10: Duravent PolyPro Horizontal Venting with Concentric Terminal,

105294-05 - 5/15

(Vent Options #3 & 4, Terminal Option F)

VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued)

Terminal (Shown) Two-Pipe System Air Intake Terminal (Not Shown)

Note: Air intake termination not shown, refer to

Venting Section in K2 Installation Instructions

supplied with the boiler.

105294-05 - 5/15

Figure 7.11: Location of Vent Terminal Relative to Windows, Doors, Grades, Overhangs, Meters and Forced Air Inlets - Two-Pipe System Vent

VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued)

Figure 7.12: Snorkel Terminal Conguration (CPVC/PVC Vent Systems Only)

C. Design Requirements Unique to Vertical Venting Systems

Table 7.13a summarizes all vertical twin pipe vent options. Table 7.13.b summarizes vent options in which an abandoned B-vent chimney is used both as a chase for the vent pipe and as a conduit for combustion air. In addition to the requirements in Part VII-A, observe the following design requirements:

1. Permitted Terminals for Vertical Venting

Terminal Option H: Fittings (Acceptable for Vent Options 10-17) – Vent terminates in a plain end (coupling for PVC, bell

end for PolyPro, Polyue and plain end pipe for InnoFlue). Intake terminates in a PVC 180 elbow pointing down (two sweep 90’s may be substituted). Observe the clearances from the roof, and normal snow line on the roof, shown in Figures 7.15 and

7.17. The section of PolyPro, Polyue or InnoFlue exposed to the outdoors must be UV resistant.

Use of rodent screens is generally recommended for both terminations. Two rodent screens suitable for 3” PVC terminals

are supplied with the boiler and are installed as shown in Figure 7.29. If 2” CPVC is used, these screens can be cut to t into the smaller ttings. Rodent screens (“bird guards”) for PolyPro, Polyue and InnoFlue are as follows:

Size/Vent System Rodent Screen (“Bird Guard”) 2” PolyPro DuraVent # 2PPS-BG

3” PolyPro DuraVent # 3PPS-BG

2” Polyue Selkirk # 2PF-HVST 3” Polyue Selkirk # 3PV-HVST

2” InnoFlue Centrotherm # IASPP02 3” InnoFlue Centrotherm # IASPP03

Terminal Option I: Ipex FGV Concentric Terminal (Acceptable for Vent Options 10 & 11) - This terminal is shown in Figure

7.16 and may be used with CPVC/PVC vent systems. Use a compatible roof ashing and storm collar in accordance with

the Ipex instructions for this terminal. This terminal is available in various lengths and in both PVC and CPVC. Terminals acceptable for use with these vent options are as follows:

Ipex PN FGV Concentric Terminal Description 196005 2 x 16” PVC

196105 2 x 28” PVC 196125 2 x 40” PVC 196006 3 x 20” PVC 196106 3 x 32” PVC 196116 3 x 44” PVC 197107 3 x 32” CPVC 197117 3 x 44” CPVC

See Part VII-E of this manual and the Ipex instructions provided with the terminal, for installation details.

105294-05 - 5/15

VII. Venting

C. Design Requirements Unique to Vertical Venting Systems (continued)

Table 7.13a: Summary of Vertical Twin Pipe Venting Options

Option 10 11 12 13 14 15 16 17

Illustrated in Figure 7.15, 717 7.15, 7.17 7.17, 7.18 7.17, 7.18 7.17 7.17 7.17 7.17

Pipe Penetration

through

Structure

Material

Nominal Diameter

Min Equivalent Vent Length:

Models

Max Equivalent Vent Length (Note 1):

Models

Vent Roof Roof Roof Roof Roof Roof Roof Roof

Intake Roof Roof Roof Roof Roof Roof Roof Roof

CPVC/

Vent

Intake PVC PVC PVC PVC PVC PVC PVC PVC Vent 2” 3” 2” 3” 2” 3” 2” 3” Intake 2” 3” 2” 3” 2” 3” 2” 3”

K2-080 12” 12” 12” 12” 12” 12” 12” 12” K2-100 12” 12” 12” 12” 12” 12” 12” 12” K2-120 K2-150 52” 52” 52” 52” K2-180 52” 52” 52” 52”

K2-080 60ft 135ft 60ft 135ft 60ft 135ft 60ft 135ft K2-100 60ft 135ft 60ft 135ft 60ft 135ft 60ft 135ft K2-120 K2-150 135ft 135ft 135ft 135ft K2-180 135ft 135ft 135ft 135ft

PVC

(Note 2)

Not

Permitted

Not

Permitted

CPVC/

PVC

(Note 2)

12”

135ft

DuraVent

PolyPro

(Rigid)

Not

Permitted

Not

Permitted

DuraVent

PolyPro

(Rigid)

12”

135ft

Selkirk

Polyue

Not

Permitted

Not

Permitted

Selkirk

Polyue

12”

135ft

Centro-

therm

InnoFlue

Not

Permitted

Not

Permitted

Centro-

therm

InnoFlue

135ft

12”

2PPS-12B

Vent

Terminal Option H

(Fittings)

Intake

Terminal Option I

(Ipex FGV Concentric)

Coupling

w/Screen

180 Elbow

w/Screen

Ipex

196105

(Note 3)

Terminal Option J

(DiversiTech CVENT

Concentric)

Terminal Option K

(DuraVent Vertical

Concentric)

Notes:

1. Max vent lengths shown also apply to the intake. For example, Vent Option #1 may have up to 60ft of vent pipe and also up to 60 ft of i intake pipe.

2. First 30” of vent and vent Elbow connected to boiler must be CPVC. Downstream vent pipe can be PVC except as noted in text.

3. Ipex FGV Concentric Terminal available in various lengths and also CPVC (see text).

CVENT-2 CVENT-3

Not

Permitted

Coupling

w/Screen

180 Elbow

w/Screen

Ipex

196006

(Note 3)

Not

Permitted

2PPS-36B

w/Screen

180 Elbow

w/Screen

Not

Permitted

Not

Permitted

2PPS-VK 3PPS-VK

3PPS-12B

3PPS-36B

w/Screen

180 Elbow

w/Screen

Not

Permitted

Not

Permitted

2PF-10UV

2PF-39UV

w/Screen

180 Elbow

w/Screen

Not

Permitted

Not

Permitted

Not

Permitted

3PF-10UV

3PF-39UV

w/Screen

180 Elbow

w/Screen

Not

Permitted

Not

Permitted

Not

Permitted

ISEP02 or ISEP0239

w/Screen

180 Elbow

w/Screen

Not

Permitted

Not

Permitted

Not

Permitted

ISEP03 or ISEP0339

w/Screen

180 Elbow

w/Screen

Not

Permitted

Not

Permitted

Not

Permitted

All vertical terminals require compatible roof ashing and storm collars.

105294-05 - 5/15

VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued)

Table 7.13b: Summary of Vertical “B-Vent Air Chase” Vent Options (B-Vent Chase MUST Be Sealed)

Option 18 19 20 21

Illustrated in Figure 7.19 7.19 7.20 7.20

Pipe Penetration

Through Structure

Material

Nominal Diameter

Min Equivalent Vent Length:

Models

Max Equivalent Vent Length (Note 1):

Models

Vent Manufacturer’s PN for Flex Termination/Components Required

Vent Roof Roof Roof Roof

Intake Roof Roof Roof Roof

Vent

Intake B Vent/PVC B Vent/PVC B Vent/PVC B Vent/PVC

Vent 2” 3” 2” 3”

Intake 2” or 3” 3” 2” or 3” 3”

Min B Vent ID 5” 6” 5” 6”

K2-080 36” 36” 36” 36”

K2-100 36” 36” 36” 36”

K2-120

K2-150 52” 52”

K2-180 52” 52”

K2-080 60ft 135ft 60ft 135ft

K2-100 60ft 135ft 60ft 135ft

K2-120

K2-150 135ft 135ft

K2-180 135ft 135ft

DuraVent

PolyPro (Rigid/

Flex)

Not Permitted

2PPS-VFT 2PPS-BV*

2PPS-FLEX**

DuraVent

PolyPro (Rigid/

Flex)

36”

135ft

3PPS-VFT 3PPS-BV*

3PPS-FLEX**

Centrotherm

InnoFlue SW/

Flex

Not Permitted

IFBK02****

IAWP02B

Centrotherm

InnoFlue SW/Flex

36”

135ft

IFBK03****

IAWP03B

* Specify size of B vent (e.g. 2PPS-BV6 is for use with 6” B vent) ** Specify length in feet.

**** Specify Flex length and B-vent diameter (e.g. IFBK022505 includes 25ft of ex and used with 5” B vent)

Note 1: Max vent lengths shown also apply to the intake. Flex vent reduces the maximum allowable vent length.

See equivalent lengths for ex vent shown in Table 7.14 and sizing example on page 31.

Vertical venting and combustion air roof penetrations (where applicable) require the use of roof ashing and storm collar, which are not supplied with the boiler, to prevent moisture from entering the structure.

105294-05 - 5/15

NOTICE

VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued)

Terminal Option J: DiversiTech Concentric Terminal (Acceptable for Vent Options 10 & 11) - This terminal is shown in Figure 7.16 and may be used with CPVC/PVC vent systems. See Part VII-E of this manual and the DiversiTech instructions provided with the terminal, for installation details.

Terminal Option K: DuraVent PolyPro Concentric Terminal (Acceptable for Vent Options 12, 13) - This terminal is shown

in Figure 7.18 and may be used with DuraVent 2” or 3” PolyPro vent systems. Use a compatible DuraVent roof ashing and

storm collar in accordance with the DuraVent instructions for this terminal See Part VII-F of this manual and the DuraVent instructions provided with the terminal, for installation details.

2. Vertical Vent and Air Intake Location – Observe the following clearances from roof mounted terminals:

• Bottom of air intake opening must be at least 12” above the normal snow line anticipated on the roof.

• Exhaust opening must be at least 2ft above any portion of the roof or structure located within horizontally within 10ft.

• For terminal option H, maintain at least 12” of vertical separation between the exhaust and intake opening as shown in

Figure 7.15 and 7.17.

3. Requirements for B-Vent Air Chase Options – Observe the following additional requirements when using an abandoned B-vent chimney as an air chase as described in Options #18-21. Also refer to Figures 7.19 & 7.20.

• B vent must be clean and in good condition.

• Use of ex Polypropylene outside of B-vent chimney is not permitted.

• All joints and seams in the B-vent must be sealed with RTV. If these seams are not accessible, vent options 18-21 cannot

be used while complying with the National Fuel Gas Code (as an alternative, the B-vent chimney can be used as a chase for the vent pipe while combustion air is piped from an outside wall - see Part VII-D for additional details).

• All venting is Polypropylene supplied by the vent manufacturer shown in Table 7.13b. The portion of this venting within the B–vent is exible.

• All ex pipe must be installed vertically. Up to two offsets (four bends) may be made in the vertical run of ex pipe.

Bends used to make these offsets may not exceed 45 degrees.

• Because the ex pipe is corrugated, it has a higher pressure drop than the rigid pipe used elsewhere in the vent system. Equivalent lengths for ex venting are shown in Table 7.14. Reduce the maximum allowable vent length shown in Table

7.13b by this equivalent length for each foot of ex pipe used, as well as for each elbow in addition to the rst. The

termination is not counted. If offsets (described above) are present, the equivalent length of the bends in these offsets can also be ignored.

Example: A 100MBH model is to be installed as using Vent Option 18 as shown in Figure 7.19. The following components

are used:

Vent: 2” DuraVent Poly-Pro (Rigid) – 4ft 2” DuraVent Poly-Pro Flex – 20ft Poly-Pro elbows – 2 DuraVent 2PPS-VFT Terminal (exhaust side)

Intake: 2” PVC – 6ft 2” PVC Sweep 90 – 3 Turn in B vent Tee

 StraightB-vent(5”orlarger)containingexvent–20ft

DuraVent 2PPS-VFT Terminal (intake side)

Vent Equivalent length – First elbow is ignored. The terminal is also ignored. From Table 7.14, the equivalent length of 2” DuraVent Poly-Pro Flex is 2.0ft. From Table 7.1 the equivalent length of the second 90 elbow is 4.5ft. The equivalent length of the vent system is therefore:

4 + 4.5 + (20 x 2.0) = 48.5ft.

Since Vent Option 18 shows a max vent length of 60ft, the planned vent length of OK.

Intake Equivalent length - First elbow and the turn in the B vent tee are ignored, leaving two sweep 90 elbows that must be counted. From Table 7.1, the equivalent length of each of these elbows is 2.6ft. From Table 7.14 the equivalent length of the

 Bventcontainingexis1.0ft.Equivalentlengthoftheintakesystemistherefore:

(2 x 2.6) +6 +(20 x 1.0) = 31.2ft.

Since this is less than 60ft, the planned intake length is OK.

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