21
Replacement Parts
The following maintenance procedures are for the
Flame Guard
®
Safety System components and should
be performed by a qualified service technician.
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 27-28 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 3).
2. Depress the dial stop and turn the gas control knob on
the combination gas control valve/thermostat clockwise
to the “OFF” position (Figure 19).
3. Remove the outer door.
4. Remove the two screws
securing the manifold
door assembly to the
combustion chamber
(Figure 22).
5. Disconnect
the
thermocouple (right-hand
thread), pilot tube, the
igniter wire from the igniter
button, the two connectors
attached to the thermal
switch, and manifold tube
at the thermostat. (Figures
22 & 23.) 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, pilot tube, and thermocouple.
7. Carefully remove the manifold assembly from the
burner compartment.
Be sure not to damage internal
parts.
Removing the Burner from the
Manifold Assembly
Natural Gas Burner (Low Nox)
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 24).
N
O
T
W
A
H
S
T
R
E
B
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I
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C
A
V
M
R
A
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T
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H
E
RI
SK
OF
Y
R
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N
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R
E
T
T
O
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W
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E R
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C
N
N
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U N I T R O L
READ ALL INSTRUCTIONS
WARNING
BEFORE LIGHTING
Pilot
Tube
Manifold Tube
Thermocouple
Right-Hand
Thread
Figure 22
Igniter
Wire
Igniter
Button
Thermal
Switch Wires
Dial Stop
Manifold
Screw (2)
N
O
T
W
A
H
S
T
R
E
B
O
R
I
A
C
A
V
M
R
A
W
U
T
O
H
T
H
E
RI
SK
OF
Y
R
U
J
N
I
D
L
A
C
S
R
E
T
T
O
H
W
A
T
E R
I
S
E
S
A
E
R
C
N
N
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C
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U N I T R O L
READ ALL INSTRUCTIONS
WARNING
BEFORE LIGHTING
Viewport
Manifold
Door
Piezo
Igniter
Button
Gas Valve /
Thermostat
Two Piece Wire
Connector
Thermocouple
Pilot Tube
Manifold
Tube
Figure 23
Burner Assembly
Removal
Thermal Switch
Burner
Two Piece Wire
Connector
Manifold Door
Assembly
Manifold Door
Assembly
Igniter Wire
Pilot
Tube
Pilot
Tube
Manifold
Tube
Manifold
Tube
Viewport
Thermocouple
Thermocouple
Thermocouple
Retainer Clip
Pilot Assembly
Pilot Assembly
Screws
Pilot Bracket
Manifold
Door
Gasket
Figure 24A
Natural Gas (Low Nox)
Burner Assembly
Burner
Thermal Switch
L.P. Gas Burner
1. Separate the pilot bracket from the L.P. burner by
removing screw.
2. Loosen set screw located on top of the L.P. burner near
the manifold door. Carefully, pull the burner away from the
manifold door assembly.
3. Check the burner to see if it is dirty or clogged. The burner
may be cleaned with soap and hot water (Figure 24B).
Screws
Burner
Two Piece Wire
Connector
Manifold Door
Assembly
Igniter Wire
Pilot
Tube
Manifold
Tube
Viewport
Thermocouple
Thermocouple
Retainer Clip
Pilot Assembly
Pilot Bracket
Manifold Door
Gasket
Figure 24B
L.P. Gas Burner
Assembly
Thermal Switch
