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If a standard model is installed above 2,000 feet (610 m) or
high altitude model is installed above 4,500 feet (1,370 m), the
input rating should be reduced at the rate of 4 percent for each
1000 feet (305 m) above sea level which requires replacement
of the burner orifice in accordance with National Fuel Gas Code
ANSI Z223.1/NFPA 54 or Contact your local gas supplier
for further information.
Failure to replace the standard orifice with a high altitude orifice
when installed at elevations above 2,000 feet (610 m) or above
4,500 feet (1,370 m) for high altitude model could result in
improper and inefficient operation of the appliance, producing
carbon monoxide gas in excess of safe limits, which could
result in serious injury or death. Contact your local gas supplier
for any specific changes which may be required in your area.
Use pipe joint compound or teflon tape marked as being
resistant to the action of petroleum [Propane (L.P.)] gases.
The appliance and its gas connection must be leak tested
before placing the appliance in operation.
The appliance and its individual shut-off valve shall be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of
1/2 pound per square inch (3.5kPa). It shall be isolated from
the gas supply piping system by closing its individual manual
Shut-off valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than 1/2 pound
per square inch (3.5kPa).
Connecting the gas piping to the gas control valve of the water
heater can be accomplished by either of the two methods
shown in Figures 29 and 30.
SEDIMENT TRAPS
A sediment trap shall be installed as close to the gas valve
inlet of the water heater as practical at the time of water heater
installation. The sediment trap shall be either a tee fitting with
a capped nipple in the bottom outlet or other device recognized
as an effective sediment trap. If a tee fitting is used, it shall
be installed in conformance with one of the methods of
installation , see Figures 29 and 30.
FIGURE 29. GAS PIPING WITH FLEXIBLE CONNECTOR.
FIGURE 30. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL.
Contaminants in the gas lines may cause improper operation
of the gas control valve that may result in fire or explosion.
Before attaching the gas line be sure that all gas pipe is clean
on the inside. To trap any dirt or foreign material in the gas
supply line, a drip leg (sometimes called a sediment trap)
must be incorporated in the piping. The drip leg must be readily
accessible. Install in accordance with the “Gas Piping” section.
Refer to the current edition of the National Fuel Code, ANSI
Z223.1/NFPA 54.