General Safety Information; Precautions; Grounding Instructions; Hydrogen Gas Flammable - A.O. Smith 100 Series Installation And Operating Manual

PRECAUTIONS

DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN
EXPOSED TO FLOODING OR WATER DAMAGE. Immediately call a
qualified service agency to inspect the water heater and to make a
determination on what steps should be taken next.
If the unit is exposed to the following, do not operate heater until
all corrective steps have been made by a qualified service agency.
1. External fire.
2. Damage.
3. Firing without water.

GROUNDING INSTRUCTIONS

This water heater must be grounded in accordance with the National
Electrical Code and/or local codes. These codes must be followed in all
cases. Failure to ground this water heater properly may also cause
erratic control system operation.
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor must
be run with the circuit conductors and connected to the equipment
grounding terminal or lead on the water heater.

HYDROGEN GAS FLAMMABLE

Hydrogen gas can be produced in a hot water system served
by this water heater that has not been used for a long period of
time (generally two weeks or more). Hydrogen gas is extremely
flammable. To reduce the risk of injury under these conditions, it is
recommended that a hot water faucet served by this water heater
be opened for several minutes before using any electrical appliance
connected to the hot water system. If hydrogen is present there will
probably be an unusual sound such as air escaping through the pipe
as the water begins to flow. THERE SHOULD BE NO SMOKING OR
OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.
Verify the power to the water heater is turned off before performing any service procedures. Electrical supply must be
turned off at circuit breaker serving water heater.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.

GENERAL SAFETY INFORMATION

GENERAL SAFETY INFORMATION

LIMITING THE RISK OF SCALDING

For a variety of reasons, water heaters can produce water that is
much hotter than its temperature setting. Take precautions to prevent
this higher temperature water from reaching the water fixtures.
According to a national standard (ASSE 1070) and many local
plumbing codes, the water heater's gas control valve should not be
used as the sole means to regulate water temperature and avoid
scalds.
A properly adjusted thermostatic mixing valve at each point of use
allows you to set the tank temperature to a higher setting without
increasing risk of scalds. A higher temperature setting allows the
tank to provide much more hot water and can help provide proper
water temperatures for appliances such as dishwashers and washing
machines.
Higher tank temperatures (140°F) also kill bacteria that cause a
condition known as "smelly water" and can reduce the levels of
bacteria that cause water-borne diseases.
4
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.