Bradford White 20A Operations Instructions download pdf (Page 7)

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Brute Deluxe (500-2000)

NOTE: The vent collar size is larger than the size of the

vent pipe that can be used. Vent collar size and

horizontal pipe diameters can be found in Table 2. The

larger vent collar size is to accommodate Category I

(vertical) vent systems.

NOTE: When located on the same wall, the Brute Deluxe

combustion air intake terminal must be installed a minimum

of 12" (30cm) below the exhaust vent terminal and sep-

arated by a minimum of 36 inches (91cm) horizontally.

The air intake terminal must be installed high enough

to avoid blockage from snow, leaves and other debris.

SECTION 2.

Venting and Combustion Air

2.1 Combustion Air

Brute Deluxe boilers and water heaters must have

provisions for combustion and ventilation air in

accordance with section 5.3, Air for Combustion and

Ventilation, of the National Fuel Gas Code, ANSI

Z223.1, or Sections 7.2, 7.3 or 7.4 of CSA B149.1,

Installation Codes, or applicable provisions of the local

building codes.

A Brute Deluxe appliance may receive combustion

air from the space in which it is installed, or it can be

ducted directly to the unit from the outside. Ventilation

air must be provided in either case.

2.1.1 Combustion Air From Room

In the United States, the most common

requirements specify that the space shall communicate

with the outdoors in accordance with method 1 or 2,

which follow. Where ducts are used, they shall be of the

same cross-sectional area as the free area of the

openings to which they connect.

Method 1: Two permanent openings, one

commencing within 12 inches (30 cm) of the top and one

commencing within 12 inches (30 cm) of the bottom, of

the enclosure shall be provided. The openings shall

communicate directly, or by ducts, with the outdoors or

spaces that freely communicate with the outdoors. When

directly communicating with the outdoors, or when

communicating to the outdoors through vertical ducts,

each opening shall have a minimum free area of 1 square

inch per 4000 BTU/hr (5.5 square cm/kW) of total input

rating of all equipment in the enclosure. When

communicating to the outdoors through horizontal ducts,

each opening shall have a minimum free area of not less

than 1 square inch per 2000 BTU/hr (11 square cm/kW)

of total input rating of all equipment in the enclosure.

Table 3 shows data for this sizing method, for each Brute

Deluxe model.

Method 2: One permanent opening, commencing

within 12 inches (30 cm) of the top of the enclosure, shall

be permitted. The opening shall directly communicate

with the outdoors or shall communicate through a vertical

or horizontal duct to the outdoors or spaces that directly

communicate with the outdoors and shall have a

minimum free area of 1 square inch per 3000 BTU/hr (7

square cm/kW) of the total input rating of all equipment

located in the enclosure. This opening must not be less

than the sum of the areas of all vent connectors in the

confined space.

Other methods of introducing combustion and

ventilation air are acceptable, providing they conform to

the requirements in the applicable codes listed above.

In Canada, consult local building and safety codes or,

in absence of such requirements, follow CSA B149.1.

2.1.2 Intake Combustion Air

The combustion air can be taken through the wall,

or through the roof. When taken from the wall, it must be

taken from out-of-doors by means of the horizontal wall

terminal (see Table 2). When taken from the roof, a

field-supplied rain cap or an elbow arrangement must be

used to prevent entry of rain water (see Figure 3).

Use single-wall galvanized pipe, per Table 4, for

the combustion air intake (see Table 2 for appropriate

size). Route the intake to the heater as directly as

possible. Seal all joints with tape. Provide adequate

hangers. The unit must not support the weight of the

combustion air intake pipe. Maximum linear pipe length

allowed is 50 feet (15.2m). Three elbows have been

calculated into the 50-foot (15.2m) linear run. Subtract

10 allowable linear feet (3.0m) for every additional

elbow used (see Table 2). When fewer than 3 elbows are

used, the maximum linear pipe length allowed is still 50

feet (15.2m).

The connection for the intake air pipe is on the

filter box. The Brute Deluxe appliances have venting

and combustion air ducting attached to the top.

In addition to air needed for combustion, air shall

also be supplied for ventilation, including all air required

for comfort and proper working conditions for personnel.

The Brute Deluxe loses less than 1 percent of its input

UNIT

EACH OPENING*

SIZE SQUARE INCHES SQUARE CM

500 125 807

750 188 1213

1000 250 1613

1250 313 2020

1500 375 2420

1750 438 2826

2000 500 3226

*Net Free Area in Square Inches / Square cm

Area indicated is for one of two openings; one at floor level and one

at the ceiling, so the total net free area could be double the figures

indicated.

This chart is for use when communicating directly with the outdoors.

For special conditions and alternate methods, refer to the latest

edition of ANSI Z223.1.

Note: Check with louver manufacturers for net free area of louvers.

Correct for screen resistance to the net free area if a screen is

installed. Check all local codes applicable to combustion air.

Table 3. Combustion Air Openings.

1 2 3 4 5 6 7 8 9 10 11 12 ... 39 40

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