A.O. Smith PCG250T403NOV 100, GAHH 40 100 HOW the Water HEATER’S Component Parts are Connected

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).

Figure 16.

FV Sensor

Figure 17.

Powered

Anode

Rod

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).

HOW THE WATER HEATER’S COMPONENT PARTS ARE CONNECTED

Figure 18.	Air Intake	Gas Control
		Valve / Thermostat
	Chamber Fan
		Pressure
		Switch

Igniter/Flame

Sense Connector

FV

Sensor

CAUTION:

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.

Anode

Rod

Control Display

CAUTION:

DO NOT USE AN EXTENSION CORD TO CONNECT THE TRANSFORMER TO AN ELECTRICAL OUTLET.

Power Supply

Transformer

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