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.
•For proper draft hood attachment, the draft hood legs may be angled slightly inward.
•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 two legs to top with sheet metal 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. See Figure 17.
Obstructed or deteriorated vent systems may present serious health risk or asphyxiation.
FIGURE 17.
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 18.
FIGURE 18.
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.
There must be a minimum of 6 inches (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 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 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.
Gas Piping
Make sure the gas supplied is the same type listed on the model rating plate. The inlet gas pressure must not exceed 14 inch water column (3.5kPa) for natural and propane gas (L.P.) gas. The minimum inlet gas pressure listed on the rating plate is for the purpose of input adjustment. If the gas control valve is subjected to pressures exceeding 1/2 pound per square inch (3.5kPa), the damage to the gas control valve could result in a fi re or explosion from leaking gas.
If the main gas line shutoff serving all gas appliances is used, also turn “OFF” the gas at each appliance. Leave all gas appliances shut “OFF” until the water heater installation is complete.
A gas line of suffi cient size must be run to the water heater. Consult the current edition of National Fuel Gas Code ANSI Z223.1/NFPA 54 and your gas supplier concerning pipe size.
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