John Wood Commercial Atmospheric Vent - AJWSM - Manual (Page 9)

9
CONFINED SPACE
When drawing combustion and dilution air from inside a conventionally
constructed building to a confined space, such a space shall be
provided with two permanent openings, ONE IN OR WITHIN 12
INCHES (30.5cm) OF THE ENCLOSURE TOP AND ONE IN OR
WITHIN 12 INCHES (30.5cm) OF THE ENCLOSURE BOTTOM.
Each opening shall have a free area of at least one square inch per
1000 Btuh (2,225mm 2 /kW) of the total input of all appliances in the
enclosure, but not less than 100 square inches (645 square cm).
If the confined space is within a building of tight construction, air for
combustion, ventilation, and draft hood dilution must be obtained
from outdoors. When directly communicating with the outdoors
or communicating with the outdoors through vertical ducts, two
permanent openings, located in the above manner, shall be provided.
Each opening shall have a free area of not less than one square inch
per 4000 Btuh (8,900mm 2 /kW) of the total input of all appliances in the
enclosure. If horizontal ducts are used, each opening shall have a
free area of not less than one square inch per 2000 Btuh (4,450mm 2 /
Kw) of the total input of all appliances in the enclosure.
VENT REDUCER
The (A)JWSM65250, & (A)JWSM100275 are shipped with an 8”
to 6” diameter flue outlet adapter. Each adapter fits on top of the
installed flue damper. Use only vent reducers supplied with the
unit. The venting must comply with the NATIONAL FUEL GAS
CODE, ANSI Z223.1/NFPA 54.
FIGURE 7
VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST
BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RE-
CIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE
SOOTING OR RISKS OF FIRE AND ASPHYXIATION.
Heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will
retard a free draft.
Type B venting is recommended with these heaters. See table 3
TECHNICAL DATA VENTING.
This water heater must be vented in compliance with all local
codes, the current edition of the National Fuel Gas Code (ANSI-
Z223.1) or The Natural Gas and Propane Installation Code (CAN/
CSA B149.1) and with the Category I Venting Tables.
If any parts of the vent system are exposed to ambient
temperatures below 35 degrees F (2 degrees C) they must be
insulated to prevent condensation.
• Do not connect the heater to a common vent or chimney with
solid fuel burning equipment. This practice is prohibited by
many local building codes as is the practice of venting gas
fired equipment to the duct work of ventilation systems.
• Where a separate vent connection is not available and the vent
pipe from the heater must be connected to a common vent with
an oil burning furnace, the vent pipe should enter the smaller
common vent or chimney at a point above the large vent pipe.
FIGURE 8
FIGURE 9
MULTIPLE HEATER MANIFOLD
Figure 10 and table 3 should be used for horizontally manifolding
two or more heaters. Also see MULTIPLE-UNIT INSTALLATIONS of
MECHANICAL VENTING section for induced draft applications.
FIGURE 10
WATER LINE CONNECTIONS
This manual provides detailed installation diagrams (see pages
16-22 of this manual) for typical methods of application for the
water heaters.
The water heater may be installed by itself, or with a separate
storage tank, on both single and two-temperature systems.
When used with a separate storage tank, the circulation may
be either by gravity or by means of a circulating pump. When a
circulating pump is used it is important to note that the flow rate
should be slow so that there will be a minimum of turbulence
inside the heater.
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