John Wood Commercial Atmospheric Vent - AJWSM - Manual (Page 8)

8
A
(RIGHT SIDE)
B
(LEFT SIDE)
C
(BACK)
D
(CEILING)
JWSM71120 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
JWSM81154 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
JWSM95199 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
JWSM76199 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
(A)JWSM100199 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
(A)JWSM65251 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
(A)JWSM100275 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
(A)JWSM65305 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
(A)JWSM65365 4” (10.16 cm) 4” (10.16 cm) 4” (10.16 cm) 12” (30.48 cm)
(A)JWSM100390 3” (7.75 cm) 3” (7.75 cm) 3” (7.75 cm) 12” (30.48 cm)
TABLE 2
In all installations the minimum combustible clearances from any
draft hood surface or vent piping shall be 6” (16cm). Vent piping
passing through a combustible wall or ceiling must be a continuous
run (no joints) and retain the 6” (16cm) clearance unless an
approved reducing thimble is used.
A service clearance of 24” (61cm) should be maintained from
serviceable parts, such as relief valves, flue baffles, flue damper
devices, thermostats, cleanout openings or drain valves.
HARD WATER
Where hard water conditions exist, water softening or threshold type
of water treatment is recommended. This will protect dishwashers,
coffee urns, water heaters, water piping and other equipment.
See MAINTENANCE section for details of tank cleanout procedure.
AIR REQUIREMENTS
REFER TO THE CURRENT EDITION OF THE “NATIONAL FUEL
GAS CODE” ANSI Z223.1/NFPA 54.
WARNING
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS
AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
VENTILATING AIR.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPLY
OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION
PRODUCTS RESULTING IN AIR CONTAMINATION THAT
MAY BE HAZARDOUS TO LIFE. SUCH A CONDITION OFTEN
WILL RESULT IN A YELLOW, LUMINOUS BURNER FLAME,
CAUSING CARBONING OR SOOTING OF THE COMBUSTION
CHAMBER, BURNERS AND FLUE TUBES AND CREATES A
RISK OF ASPHYXIATION.
Where an exhaust fan is supplied in the same room with a
heater, sufficient openings for air must be provided in the
walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO
BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY,
CAUSING POOR COMBUSTION. SOOTING MAY RESULT
IN SERIOUS DAMAGE TO THE HEATER AND RISK OF FIRE
OR EXPLOSION.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction,
unconfined spaces may provide adequate air for combustion,
ventilation and draft hood dilution.
If the unconfined space is within a building of tight construction
(buildings using the following construction: weather stripping,
heavy insulation, caulking, vapor barrier, etc.), air for combustion,
ventilation and draft hood dilution must be obtained from
outdoors. The installation instructions for confined spaces in
tightly constructed buildings must be followed to ensure adequate
air supply.
ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE
FIGURE 6
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