Removing The Burner Door Assembly - American Water Heater Ultra Low Nox Installation Instructions Manual

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:
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 Burner Door Assembly

1. Turn off the gas to the water heater at the manual
shut-off valve (Figure 3).
2. Before performing any maintenance, it is important to
turn off the gas supply to the
water heater at the manual
gas shut-off valve. This valve
is typically located beside
the water heater. Note the
position of the shut-off valve
in the open/on position, then
proceed to turn it off (Figure
3).
3. Remove the outer door.
4. Remove the two screws
(1/4" nut driver) securing
the burner door assembly
to the combustion chamber
(Figure 23).
5. Disconnect the pilot tube
(7/16" wrench), the igniter wire from the igniter lead
wire, and manifold tube (3/4" wrench) at the gas
control valve/thermostat. Disconnect the sensor wires
(lift white lever outward, then gently pull the plug
downward). Also, use needle nose pliers to disconnect
the red (+) and white (-) thermopile wires from the gas
control valve/thermostat. See Figures 22 & 23.
Figure 23
Burner Assembly Gas Control Valve/
Removal Thermostat
Piezo Igniter Button
Pilot Tube
Viewport
Outer Door
Not Shown
Burner Door Screws (2)
24
Figure 22
Gas Control Valve/
Thermostat
Sensor
VAC
Igniter
Button
Igniter
Lead
Wire
Pilot
Red
Tube
Wire
Igniter Manifold (Left
Wire
Tube
Side)
Temperature Sensor
Wire Connection
Thermopile
Wire
Connections
VAC
Manifold Tube
Temperature
Sensor
Burner Door
Manifold Component Block
6. Grasp the manifold tube and push down slightly to free
the manifold, pilot tube, and thermopile.
7. Carefully remove the burner door assembly from the
burner compartment.
NOTE: Be sure not to damage internal parts.
Figure24A
NaturalGas(LowNox)
Burner Door Assembly
Burner
Figure24B
Wires
NaturalGas(LowNox)
Burner Door Assembly
50K Models
White
Wire
(Right
Side)
Burner
Natural Gas Burner (Ultra Low Nox)
Check the burner to see if it is dirty or clogged. The burner
may be cleaned with soft paint brush (Figure 24). Do not
use a wire brush or any tool that may damage the burner
screen. Important: Do not use the burner if the burner screen
is damaged. NOTE: Damage may be rips or holes in the
burner screen. Discoloration is normal.
Pilot Assembly
Use brush on this surface.
Pilot Assembly
Use brush on this surface.