UTICA BOILERS JE Installation Manual download pdf (Page 10)

6. In calculating free area using louvers, grilles or

screens for above, consideration shall be given

to their blocking effect. Screens used shall not be

smaller than 1/4 inch mesh. If free area through

design of louver or grill is known, it should be used

in calculating size opening required to provide free

area specied. If design and free area is not known,

it may be assumed that wood louvers will have 20-

25% free area and metal louvers and grilles will

have 60-75% free area. Louvers and grilles should

be xed in open position or interlocked with boiler

so they are opened automatically during boiler

operation.

The vent pipe must slope upward from the boiler

not less than 1/4” for every 1’ to the vent terminal.

Figures 1 & 2.

Horizontal portions of the venting system shall be

supported rigidly every 5 feet and at the elbows. No

portion of the vent pipe should have dips or sags.

Flue Connection And Venting

Vent installations shall be in accordance with “Venting of

Equipment”, of the National Fuel Gas Code, ANSI Z223.1/

NFPA 54, or applicable provisions of the local building

codes.

Consult dimensional drawing for number and size of

ue pipes required for each size boiler.

Maintain minimum upward slope of 1/4 inch per linear

foot from the boiler to chimney.

Run ue pipe directly as possible. Keep turns to a

minimum. Insert ue pipe into, but not beyond, inside

wall of chimney. Do not connect into a chimney serving

an open replace.

Insulate ue pipe where it passes near combustible

material.

Rigidly support pipe with hangers and straps.

Extend chimneys at least 2 feet above any object

within radius of 15 feet, including roof.

Install hood on all ue pipes which extend through roof.

In most locations, venting of boiler relies on natural

draft. In as much as energy available from natural

draft is quite low, serious thought should be given to

vent system design, i.e., adequate size, use of gradual

transitions, tees, elbows, etc., close proximity of boiler

and chimney. On all boilers, vertical risers must be at

least as large as vent openings on draft-hood.

Boiler

manufacturer makes no specic recommendations

regarding application of draft inducers that may be

used with this boiler. If draft inducer is used, it is up to

installing contractor and draft inducer manufacturer to

determine proper application.

VENTILATION AND COMBUSTION AIR

A. When installing two openings, one must commence

within 12 inches from top and other within 12

inches from bottom of enclosure. Openings shall

communicate directly, or by ducts, with outdoors

or spaces (crawl or attic) that freely communicate

with outdoors. One of following methods must be

used to provide adequate air for ventilation and

combustion.

1) When directly communicating with outdoors,

each opening shall have minimum free area of

1 square inch per 4,000 Btu per hour of total

input rating of all equipment in enclosure. Refer

to Figure 2 on previous page.

2) When communicating with outdoors by

means of vertical ducts, each opening shall

have minimum free area 1 square inch per

4,000 Btu per hour of total input rating of all

appliances in the enclosed space.

3) If horizontal ducts are used, each opening

and duct shall have minimum free area 1

square inch per 2,000 Btu per hour of total

input rating of all appliances in the enclosed

space.

VENT INSTALLATION

B. One permanent opening, commencing within 12

inches of top of enclosure, shall be permitted where

equipment has clearances of at least 1 inch from

sides, 1 inch from back, and 6 inches from front

of boiler. Opening shall directly communicate with

outdoors or shall communicate through vertical

or horizontal duct to outdoors or spaces (crawl

or attic) that freely communicate with outdoors.

Openings must have minimum free area of 1

square inch per 3000 Btu per hour of total input

rating of all equipment located in enclosure. Free

area must be no less than sum of areas of all vent

connectors in conned space.

WARNING

Vent connectors serving appliances vented by

natural draft shall not be connected into any

portion of mechanical draft systems operating

under positive pressure.

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UTICA BOILERS JE Installation Manual Page 10

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