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17
The appliance and its individual shut-off valve should be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of
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
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 19 and 20.
SedimentTraps
Contaminants in the gas lines may cause improper operation
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
be incorporated in the piping. The drip leg must be readily
accessible. Install in accordance with the Gas Piping section.
ANSI Z223.1/NFPA 54.
A sediment trap should be installed as close to the inlet of the
water heater as practical at the time of water heater installation.
nipple in the bottom outlet or other device recognized as an
in Figures 19 and 20.
FIGURE 19. GAS PIPING WITH FLEXIBLE CONNECTOR.
FIGURE 20. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL.