American Water Heater Ultra Low Nox Manuel d'instructions télécharger pdf (Page 15)

Use pipe joint compound or teﬂ on tape marked as being resistant

to the action of petroleum gases.

The water heater and its gas connection must be leak tested before

placing the appliance in operation.

The water heater 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 (3.5 kPa). 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 (3.5 kPa).

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 13 and 14.

SEDIMENT TRAP

FIGURE 13. GAS PIPING WITH FLEXIBLE CONNECTOR.

FIGURE 14. GAS PIPING WITH ALL

BLACK IRON PIPE TO GAS CONTROL.

SEDIMENT TRAPS

A sediment trap shall be installed as close to the inlet of the water

heater as practical at the time of water heater installation. The

sediment trap shall be either a tee ﬁ tting with a capped nipple in the

bottom outlet or other device recognized as an effective sediment

trap. If a tee ﬁ tting is used, it shall be installed in conformance

with one of the methods of installation shown in Figures 13 and 14.

Contaminants in the gas lines may cause improper operation of the

gas control valve that may result in ﬁ re 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 sediment trap must

be incorporated in the piping. The sediment trap must be readily

accessible. Install in accordance with the “Gas Piping” section. Refer

to the current edition of the National Fuel Gas Code, ANSI Z223.1/

NFPA 54.

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American Water Heater Ultra Low Nox Manuel d'instructions Page 15