State GS6 75 URRBS - Manual (Page 13)

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CGA 6.14 (covering electrically and mechanically actuated vent
dampers). Before installation of any vent damper, consult the local
gas utility for further information.
To ensure proper venting of this gas-fi red water heater, the correct
vent pipe diameter must be utilized. Any additions or deletions of
other gas appliances on a common vent with this water heater may
adversely affect the operation of the water heater. Consult your gas
supplier if any such changes are planned.
For proper venting in certain installations, a larger diameter vent pipe
may be necessary. Consult your gas supplier to aid you in determining
the proper venting for your water heater from the vent tables in the
current edition of the National Fuel Gas Code ANSI Z223.1/NFPA 54.
Periodically check the venting system for signs of obstruction or
deterioration and replace if needed.
The combustion and ventilation air fl ow must not be obstructed.
The water heater with draft hood installed must be connected to a
chimney or listed vent pipe system, which terminates to the outdoors.
Never operate the water heater unless it is vented to the outdoors
and has adequate air supply to avoid risks of improper operation,
explosion or asphyxiation.
• Place the draft hood legs in the receiving holes on the top of the
water heater. The legs will snap in the holes to give a tight fi t.
Secure draft hood with the supplied screws.
• Place the vent pipe over the draft hood. With the vent pipe in position,
drill a small hole through both the vent pipe and draft hood. Secure
them together with a sheet metal screw.
DRAFT HOOD INSTALLATION
Align the legs of the draft hood with the slots provided. Insert the
legs and secure the draft hood to the water heater’s top with the
four screws provided as shown in Figure 11. Do not alter the draft
hood in any way. If you are replacing an existing water heater, be
sure to use the new draft hood supplied with the water heater.
FIGURE 11.
The vent pipe from the water heater must be no less than the diameter
of the draft hood outlet on the water heater and must slope upward
at least 1/4 inch per linear foot (21 mm per meter), see Figure 12.
All vent gases must be completely vented to the outdoors of the
structure (dwelling). Install only the draft hood provided with the
new water heater and no other draft hood.
Vent pipes must be secured at each joint with sheet metal screws.
FIGURE 12.
There must be a minimum of 6” (153 mm) clearance between single
wall vent pipe and any combustible material. Fill and seal any
clearance between single wall vent pipe and combustible surfaces
with mortar mix, cement, or other noncombustible substance. For
other than single wall, follow vent pipe manufacturer’s clearance
specifi cations. To insure a tight fi t of the vent pipe in a brick chimney,
seal around the vent pipe with mortar mix cement.
Failure to have required clearances between vent piping and
combustible material will result in a fi re hazard.
Be sure vent pipe is properly connected to prevent escape of
dangerous fl ue gases which could cause deadly asphyxiation.
Chemical vapor corrosion of the fl ue and vent system may occur
if air for combustion contains certain chemical vapors. Spray can
propellants, cleaning solvents, refrigerator and air conditioner
refrigerants, swimming pool chemicals, calcium and sodium chloride,
waxes, bleach and process chemicals are typical compounds which
are potentially corrosive.
DRAFT HOOD
SHEET METAL SCREWS (FOUR PROVIDED)
LEGS
SLOT
INSTALL THE DRAFT HOOD WITH
THE FOUR SCREWS PROVIDED.
JACKET TOP
SLOT
LEGS