John Wood Commercial - AJWS - Manual (Page 5)

Important: If installing over carpeting, the carpeting must
be protected by a metal or wood panel beneath the water
heater. The protective panel must extend beyond the full
width and depth of the water heater by at least 76mm (3 in)
in any direction, or if in an alcove the entire floor must be
covered by the panel. The panel must be strong enough to
carry the weight of the water heater when full of water. Figure 1 may be used as a reference guide to locate the
specific clearance locations. A minimum of 610mm (24 in) of
front clearance and 102mm (4 in) on each side should be
provided for inspection and service.
COMBUSTION/VENT PIPE SYSTEM
Combustion
Combustion air must be free of acid-forming chemicals.
These chemicals are found in aerosol sprays, detergents,
bleaches, cleaning solvents, air freshener, paint and varnish
removers, refrigerant, and many other commercial prod-
ucts. When burned, vapours from these products form high-
ly corrosive acid compounds. These products should not be
stored or used near the water heater or air inlet.
Venting
Vent pipe installation must be installed according to all state
and local codes, or in the absence of local and state codes,
the National Fuel Gas Code, NFPA 54, ANSI Z223.1-latest
edition. Canadian installations must be performed in accor-
dance with CAN/CSA-B149.1.
It is the responsibility of the installing contractor to provide a
vent adequate in capacity and in good usable condition.
Btu/hr capacity limitations are governed by the style and
height of the vent/chimney. For installations in the United
States, capacity tables are available in the National Fuel
Gas Code (ANSI Z223.1- latest edition). Canadian installa-
tion information can be found in CAN/CSA-B149.1
U.L. recognized fuel gas and carbon monoxide (CO) detec-
tors are recommended in all applications and should be
installed using the manufacturer’s instructions and local
codes, rules, or regulations.
Important: Check to make sure the vent pipe is not blocked
in any way.
• Venting should be as direct as possible with a minimum
number of pipe fittings.
5
Vent
Top to
ceiling
Sides
Front 24” min.
for service
Sides
Back
Top View
Front View
Figure 1: Minimum Clearance Locations
Carbon Monoxide Hazard
Follow all instructions to locate and install
the vent pipe system.
Instructions can be found in this manual, in
state or local codes (or authority having
jurisdiction), or in the absence of such, the
National Fuel Gas Code, ANSI Z223.1, NFPA
54, latest edition. Canadian installations
must be performed in accordance with
CAN/CSA-B149.1
Failure to properly locate and install the vent
pipe system can result in death, explosion,
or carbon monoxide poisoning.
WARNING
Front 610mm (24 in)
min. for service