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State SBL100 76 NE User Manual

Page 15

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15

If the water heater is being installed as a replacement for an

existing heater in pre-existing venting, a thorough inspection of

existing venting system must be performed prior to any installation

work.
VENT DAMPERS - Any vent damper, whether it is operated

thermally or otherwise must be removed if its use inhibits proper

drafting of the water heater.
Thermally Operated Vent Dampers: this gas-fired water heater

has a thermal efficiency at or above 80% which may produce

a relatively low flue gas temperature. Such temperatures may

not be high enough to properly open thermally operated vent

dampers. This would cause spillage of the flue gases and may

cause carbon monoxide poisoning. Vent dampers must bear

evidence of certification as complying with the current edition of

the American National Standard ANSI Z21.66 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 insure proper venting of this gas-fired 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 or the Natural Gas and Propane Installation

code cAN\cSA B 149.1.
Periodically check the venting system for signs of obstruction or

deterioration and replace if needed.
The combustion and ventilation air flow 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.
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 13. 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.
Obstructed or deteriorated vent systems may present serious

health risk or asphyxiation.

DRAFT HOOD

SHEET METAL SCREWS (FOUR PROVIDED)

LEGS

SLOT

INSTALL THE DRAFT HOOD WITH

THE FOUR SCREWS PROVIDED.

JACKET TOP

SLOT

LEGS

fIGure 13.

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 14.
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 14.

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 material

with mortar mix, cement, or other noncombustible substance. For

other than single wall, follow vent pipe manufacturer’s clearance

specifications. To insure a tight fit 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 fire hazard.
Be sure vent pipe is properly connected to prevent escape of

dangerous flue gases which could cause deadly asphyxiation.

Chemical vapor corrosion of the flue 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.