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Warning – Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler User Manual

Page 22

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22

WARNING

Vent extending through exterior wall shall not

terminate adjacent to wall or below building

extensions such as eaves, balconies, parapets or

decks. Failure to comply could result in death or

serious injury.

!

6.4 Vent Pipe Installation

• Minimum and maximum combustion air and vent pipe

lengths listed in Table 5. Pipe length counted from

combustion air connector to termination.

• Install field-sourced 2" to 3" transition, if used, in vertical

section at combustion air inlet and vent connector.

• 90° elbows equivalent to 5.0 ft (1.6 m). 45° elbows

equivalent to 3.5 ft (1.1 m). 2" to 3" transition has no

equivalent length. See Table 6.

• Use flexible Polyproplyene piping (PP) in a vertical

position only. Check PP pipe manufacturer for details.

Each foot of PP flexible pipe is equivalent to 2⅝ feet of

smooth pipe of same diameter.

• Slope vent pipes minimum 1/4" per foot (21 mm/m)

back toward boiler. Support horizontal sections to

prevent sags capable of accumulating condensate.

• Support piping in accordance with pipe manufacturer's

instruction and authority having jurisdiction. In absence

of manufacturer's instruction use pipe hooks, pipe

straps, brackets, or hangers of adequate and strength

located at intervals of 4 ft (1.2m) or less. Allow for

expansion/contraction of pipe.

• Combustion air and vent piping must be air tight and

water tight.

• Certified vent system components must NOT be

interchanged with other vent systems or unlisted pipe/

fittings.

6.5 Vent Termination

• Terminate combustion air and vent pipes with fittings or

concentric vent kit.

A. See "Parts, Kits and Optional Accessories" manual

for concentric vent kit part numbers.

B. Use horizontal pipe for vent and 90° elbow for

combustion air termination when using fittings.

• Terminate combustion air and vent pipes in same

atmospheric pressure zone through exterior sidewall or

roof.

• Locate combustion air termination as far as possible

from swimming pool, swimming pool pump house, and

other sources of airborne chlorine.

• Locate combustion air and vent terminals as required by

authority having jurisdiction.

Minimum/Maximum Vent Lengths

2” Pipe

3” Pipe

4” Pipe

Model

050

075/100

075/100

150/200

299

299

Min.

6 ft.

(1.8 m)

6 ft.

(1.8 m)

6 ft.

(1.8 m)

6 ft.

(1.8 m)

6 ft.

(1.8 m)

6 ft.

(1.8 m)

Max.

100 ft.

(30.5 m)

50ft.

(15.2 m)

100 ft.

(30.5 m)

100 ft.

(30.5 m)

25 ft.

(7.7 m)

100 ft.

(30.5 m)

Table 5 - Combustion Air and Vent Piping Length

For Example: Boiler can be installed on outside wall and vented with one 90° elbow and 1 ft (0.30 m) of vent pipe.

Table 6 -Equivalent Length of Venting Components

Equivalent Length of Venting Components

Component

Feet

Meters

90° Elbow

5

1.6

45° Elbow

3 1/2

1.1

2" x 4" Adapter

0

0

3" x 4" Adapter

0

0

Concentric Vent Kit

5

1.6

Polypropylene Flexible Pipe per Foot

2 5/8

0.8

6 - COMBUSTION AIR AND VENT PIPING