Gas Piping - Reliance Water Heaters FVIR C3 Instruction Manual

Vent dampers must bear evidence of certification as complying with
the current edition of the American National Standard ANSI Z21.68
(ANSI Z21.66 & 67, respectively, cover 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.
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.
For proper drafthood attachment, the drafthood legs may be angled
slightly inward.
Obstructed or deteriorated vent systems may present serious health
risk or asphyxiation.
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 27.
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 27.
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
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.

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
(2.6 kPa) for natural and propane gas (L.P.) gas. The minimum inlet gas
pressure shown on the rating plate is that which will permit firing at
rated input. If the gas control valve is subjected to pressures exceeding
1/2 pound per square inch (3.5 kPa), the damage to the gas control
valve could result in a fire 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 sufficient 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.
There must be:
• A readily accessible manual shut off valve in the gas supply line
serving the water heater, and
• A drip leg (sediment trap) ahead of the gas control valve to help
prevent dirt and foreign materials from entering the gas control
valve.
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