General Safety Information; Precautions; Hydrogen Gas (Flammable) - A.O. Smith DEL-6 Instruction Manual

precautIons

DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN
UNDER WATER. Immediately call a qualified service technician
to inspect the water heater and to replace any part of the control
system which has been under water.
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 must be
followed in all cases. Failure to ground this water heater properly
may also cause erratic control system operation on ELECTRONIC
CONTROL models.
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.
when servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door.

General safety InforMatIon

hydroGen Gas (flaMMable)

Hydrogen gas can be produced in a hot water system served by this
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 the hot water
faucet be opened for several minutes at the kitchen sink 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.
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