American Water Heater GAS-FIRED COMMERCIAL WATER HEATER - Manual (Page 28)

28
General Operation (Temperature Adjustment) continued-
An automatic gas shut-off device (ECO) is incorporated in the thermostat
which will shut off all gas supply to the burner and pilot if the water heater
temperature exceeds 200°F (93°C). Should the ECO function (open), the
water temperature should be reduced to approximately 120°F (49°C) and
follow applicable Lighting Instructions (page 25 or 26) to place the water
heater in operation. If a problem exists, contact your dealer for service. It is
recommended that all service work be performed by a qualified service
agency.
If the water heater is to remain idle for 30 days or more or is subjected to
freezing temperatures while shut off, the water heater and piping should be
fully drained (See page 22, “To Drain the Water Heater”) and the drain valve
should be left fully open.
Hotter water increases the risk of scald injury. Scalding may occur
within five (5) seconds at a temperature setting of 135
°F (57 °C). To
protect against hot water injury, install an anti-scald tempering valve in
the water system. This valve will reduce point of discharge temperature
by mixing cold and hot water in branch water lines. A licensed plumbing
professional or local plumbing authority should be consulted.
Note: This water heater is equipped with an energy cut out device to
prevent overheating. Should overheating occur or the gas supply fail to
shut off, turn off the manual gas control valve to the appliance and call a
qualified service technician.
Note: Whenever the water heater is filled with cold water, condensate
will form on the cool tank surface and drops of water will fall on the hot
burner and combustion chamber surfaces producing a “sizzling” noise.
Condensation is normal and does not indicate a leak. It will disappear
when the tank becomes heated.
DANGER
WARNING
Hydrogen gas can be produced in an operating water heater that has
not had water drawn from the tank for a long period of time (generally
two weeks or more). Hydrogen gas is extremely flammable. To
prevent the possibility of injury under these conditions, we
recommend the hot water faucet to be open for several minutes at the
kitchen sink before you use any electrical appliance which is
connected to the hot water system. If hydrogen is present, there will
be an unusual sound such as air escaping through the pipes as hot
water begins to flow. Do not smoke or have open flame near the
faucet at the time it is open.
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