Boiler Located In Confined Space; Installation-System Piping - Carrier B Series Installation, Start-Up, And Operating Instructions Manual

PROCEDURE 2—BOILER LOCATED IN CONFINED SPACE
EXAMPLE 2A: ALL AIR FROM INSIDE THE BUILDING
The confined space shall be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so
that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the
combined space shall be considered in making this determination. Each opening shall have a minimum free area of one square inch per 1,000 Btu
per hour of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches. One opening shall be
within 12 inches of top and one within 12 inches of bottom of enclosure. The minimum dimension of air openings shall not be less than 3 inches.
EXAMPLE 2B: ALL AIR FROM OUTDOORS
The confined space shall communicate with the outdoors in accordance with examples 1 or 2. The minimum dimension of air openings shall not
be less than 3 in. Where ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect.
1. Two permanent openings, one commencing within 12 inches of top, and one commencing within 12 inches of bottom of enclosure shall
be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate
with the outdoors
a. Where directly communicating with the outdoors or where communicating to the outdoors through vertical ducts, each opening shall have
a minimum free area of 1 sq. in. per 4000 Btu per hour of total input rating of all equipment in enclosure. (See Table 3A.)
b. Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq. in. per 2000
Btu per hour of total input rating of all equipment in enclosure. (See Table 3B.)
2. One permanent opening commencing with 12 inches of top of enclosure shall be permitted where equipment has clearance of at least 1 inch
from sides and back and 6 inches from front of appliance. The opening shall directly communicate with the outdoors or shall communicate
through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with the outdoors and shall have a
minimum free area of:
a. 1 sq. inch per 3000 Btu per hour of total input of all equipment located in enclosure (see Table 3C), and
b. Not less than the sum of the areas of all vent connectors in the confined space.
Fresh Air
Duct Size (In.)
3" X 12"
8" X 8"
8" X 12"
8-1/2" X 16"
* 1 Square Inch per 4,000 Btuh
Fresh Air
Duct Size (In.)
3" X 12"
8" X 8"
8" X 12"
8-1/2" X 16"
* 1 Square Inch per 2,000 Btuh
Table 3C—Fresh Air Duct Capacities for Vertical or Horizontal Ducts (Btuh)*
Fresh Air
Duct Size (In.)
3" X 12"
8" X 8"
8" X 12"
8-1/2" X 16"
* 1 Square Inch per 3,000 Btuh
The near boiler piping (piping around boiler) must be considered as part of boiler for proper water level control and to produce dry steam. Correct
near boiler piping is crucial to proper operation of boiler and heating system. Follow these recommendations carefully.
1. Place boiler in selected location as near chimney as possible.
2. Install relief valve using factory-supplied 3/4-in. coupling into 3/4-in. pipe nipple on top of boiler. Make a discharge pipe using 3/4-in. pipe
(field supplied) to carry water or steam to a nearby drain. Do not connect discharge pipe directly to drain but leave an air gap. The
downstream end of discharge pipe must be unthreaded. No shutoff of any description shall be placed between relief valve and boiler, or
on discharge pipes between such safety valves and the atmosphere. Installation of relief valve shall conform to requirements of the
ANSI/ASME Boiler and Pressure Vessel Code, Section IV. The manufacturer is not responsible for any water damage.
Table 3A—Fresh Air Duct Capacities for Vertical Ducts (Btuh)*
100% FREE AREA
1/4-in. Mesh
Screen
144,000
256,000
384,000
512,000
Table 3B—Fresh Air Duct Capacities for Horizontal Ducts (Btuh)*
100% FREE AREA
1/4-in. Mesh
Screen
72,000
128,000
192,000
256,000
100% FREE AREA
1/4-in. Mesh
Screen
108,000
192,000
288,000
384,000
INSTALLATION—SYSTEM PIPING
75% FREE AREA
Metal
Louvers
108,000
192,000
288,000
384,000
75% FREE AREA
Metal
Louvers
54,000
96,000
144,000
192,000
75% FREE AREA
Metal
Louvers
81,000
144,000
216,000
288,000
—6—
25% FREE AREA
Wood
Louvers
36,000
64,000
96,000
128,000
25% FREE AREA
Wood
Louvers
18,000
32,000
48,000
64,000
25% FREE AREA
Wood
Louvers
27,000
48,000
72,000
96,000