A.O. Smith Water Heater 12 40GPC T 100 User Manual

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13
KNOW THE WATER HEATER’S COMPONENT PARTS
Flammable Vapor Cut Off Switch (FV Sensor)
The water heater is equipped with a FV sensor, for
detecting the presence of flammable vapors (e.g.
spilled gasoline). When the sensor detects those
vapors, the heater will shut down and not operate.
If flammable vapors are detected or the sensor
is inoperative, an icon will flash on the electronic
control display and the heater will go into a lockout
mode. The water heater will not function again until
the flammable vapors have been eliminated and the
control is manually reset using a special Flammable
Vapor sensor reset sequence. (Figure 16).
Power Anode Rod
To protect the glass-lined water tank from corrosion
through electrolysis, this water heater is equipped
with a non sacrificial powered anode rod. Unlike
conventional magnesium or aluminum anode rods
used in water heaters, the powered anode does
not deteriorate and is less likely to contribute to
the occurrence of “Smelly (Rotten Egg) Water”
(Figure 17).
FV Sensor
Figure 16.
Powered
Anode
Rod
Figure 17.
HOW THE WATER HEATER’S COMPONENT PARTS ARE CONNECTED
Pressure
Switch
Control Display
Power Supply
Transformer
Igniter/Flame
Sense Connector
Air Intake
Chamber Fan
Anode
Rod
Gas Control
Valve / Thermostat
CAUTION:
LABEL ALL WIRES PRIOR TO
DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN CAUSE
IMPROPER AND DANGEROUS OPERATION.
VERIFY PROPER OPERATION AFTER SERVICING.
FV
Sensor
CAUTION:
DO NOT USE AN EXTENSION
CORD TO CONNECT THE
TRANSFORMER TO AN
ELECTRICAL OUTLET.
Figure 18.

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