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Installation Guide

ManualsBrandsA.O. Smith ManualsGas Water HeatersG6-DMH3030NV
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LP GAS ONLY
Liquefi ed petroleum gas is over 50% heavier than air and in the
occurrence of a leak in the system, the gas will settle at fl oor level.
Basements, crawl spaces, skirted areas under mobile homes (even
when ventilated), closets and areas below ground level will serve
as pockets for the accumulation of gas. Before lighting an L.P. gas
water heater, smell all around the appliance at fl oor level. If you smell
gas, follow the instructions as given in the warning on the front page.
When your L.P. tank runs out of fuel, turn off the gas at all gas
appliances including pilot lights. After the tank is refi lled, all appliances
must be re-lit according to their manufacturer’s instructions.
WARNING
Explosion Hazard
Have a qualified technician make sure that the L.P.
gas operating pressure does not exceed 13” water
column (3.237 kilopascals).
Failure to do so can result in death, explosion, or fire.
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 28, 29, and 30.
FIGURE 27. GAS PIPING WITH FLEXIBLE CONNECTOR
FIGURE 28. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL VALVE/THERMOSTAT
FIGURE 29. ALTERNATIVE SEDIMENT TRAP LOCATION
Contaminants in the gas lines may cause improper operation of
the gas control valve/thermostat 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 (sometimes called a drip leg) 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.