American Water Heater 319407-002 Replacement Parts, Removing the Manifold Assembly

Figure 27

Gas Control Valve/ Thermostat

Replacement Parts

IMPORTANT: The following maintenance procedures are for the Flame Guard™ Safety System components and should be performed by a qualified person.

Replacement parts may be ordered through your plumber or the local distributor. Parts will be shipped at prevailing prices and billed accordingly. When ordering replacement parts, always have the following information ready:

Removing the Burner from the Manifold Assembly

Natural Gas Burner (Low Nox) & L.P. Burner

1.Take off the burner by removing the two (2) screws lo- cated underneath the burner.

2.Check the burner to see if it is dirty or clogged. The burner may be cleaned with soap and hot water (Figure 29).

1.model, serial, and product number

2.type of gas

3.item number

4.parts description

See pages 31-32 for a list of available repair parts.

Removing the Manifold Assembly

1.Turn off the gas to the water heater at the manual shut-off valve (Figure 5).

2.Move the ON/OFF switch on the gas control valve/

thermostat to the “OFF” position to turn off the water heater.

(Figure 22).

3.	Remove the outer door.	ON
		STATUS
4.	Remove the two screws	OFF		Y
		HOT
		B C
		A	VER
	(1/4” nut driver) securing			HOT
		LOW		VAC
		•
			•
	the manifold door assembly
	to the combustion chamber
	(Figure 28).

5.Disconnect the pilot tube (7/16” wrench), the igniter wire, and manifold tube

Figure 29

Natural gas (Low NOx) and L.P. Burner Assembly

Manifold Component Block

Manifold Door

Gasket

Burner

Pilot/Igniter - Flame

Sensor Assembly

Manifold Door Assembly

Thermal Switch

Manifold Tube

Igniter Wire

Viewport

Pilot Tube

Manifold Tube

(3/4” wrench) at the gas	Igniter	Pilot	Manifold
control valve/thermostat.	Wire	Tube	Tube
Also use needle nose pliers		Wiring Harness

to disconnect the yellow

TCO wire leads from the thermal switch on the manifold door. NOTE: L.P. Gas systems use reverse (left-hand) threads on the manifold tube.

6.Grasp the manifold tube and push down slightly to free the manifold and pilot tube.

7.Carefully remove the manifold assembly from the burner compartment.

NOTE: Be sure not to damage internal parts.

Figure 28
Burner Assembly
Removal
Gas Control Valve/
Thermostat
	Wiring
Pilot Tube	Harness
	Manifold Tube
Viewport
FV Sensor	Thermal Switch
	Manifold Door
Manifold Screw (2)	Manifold Component Block
24

Screws	Manifold Door
	Assembly

Replacing the Pilot/Igniter - Flame Sensor Assembly

1.Remove the manifold assembly as directed previously.

2.Lift the retainer clip straight up from the back of the manifold component block (using a flat-blade screwdriver), then remove the manifold component block from the manifold door (Figure 30).

Figure 30	Pilot/Igniter-Flame Sensor Assembly
Manifold Component
	Pilot Tube
Block Assembly
	Retainer
Igniter	Clip
Wire

Manifold Component
Block	Manifold Door

3.Using a 7/16” wrench, loosen the nut securing the pilot tube to the pilot assembly.