Gas Piping - A.O. Smith POWER VENT GAS Installation And Operating Manual

If after manually operating the valve, it fails to completely
reset and continues to release water, immediately close
the cold water inlet to the water heater, follow the draining
instructions, and replace the temperature-pressure relief
valve with a new one.
T&P Valve and Pipe Insulation (if supplied)
Remove insulation for T&P valve and pipe connections
from carton.
FIGURE 18
Fit pipe insulation over the incoming cold water line and
the hot water line. Make sure that the insulation is against
the top cover of the heater. Fit T&P valve insulation over
valve. Make sure that the insulation does not interfere with
the lever of the T&P valve.
Secure all insulation using tape.
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GAS PIPING

Make sure gas supplied is same type listed on model
rating plate. The inlet gas pressure must not exceed 14
in. WC (3.5 kPa) for natural and propane gas (L.P.). The
minimum inlet gas pressure shown on rating plate is that
which will permit fi ring at rated input.
All gas piping must comply with CAN/CSA-B149.1, the
Natural Gas and Propane Installation Code.
If the gas control valve is subjected to pressures exceeding
1/2 psi (3.5 kPa), the damage to the gas control valve could
result in a fi re or explosion from leaking gas.
If the main gas line shut-off 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 suffi cient size must be run to the water
heater. Consult the current edition of CAN/CSA-B149.1,
the Natural Gas and Propane Installation Code 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.
• A ground joint union or equivalent means to disconnect
piping between the shut off valve and control valve to
permit servicing of the unit.
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