Replacing The Flame Sense/Hot Surface Igniter Assembly; External Inspection & Cleaning Of The Air Intake Chamber Louvers; Cleaning The Combustion Chamber Andair Diverter Assembly; Replacing The Manifold Burner/Assembly - A.O. Smith 315456-002 Installation Instructions And Use And Care Manual

Replacing the Flame Sense/Hot Surface igniter
Assembly
1. Remove the manifold/burner assembly. See Removing
the Manifold/Burner Assembly.
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 26.)
3. Remove and keep the screw securing the flame sense/
hot surface igniter assembly (Figure 26).
4. Remove and discard the old flame sense/hot surface
igniter assembly.
5. Route the new flame sense/hot surface igniter con-
nector wire through manifold/burner door opening as
shown in figure 26. Secure assembly to bracket using
screw removed earlier.
Screw
Manifold Component
Block
6. Reposition the manifold component block in the mani-
fold door opening and secure it with the retainer clip.
7. See Replacing the Manifold/Burner Assembly.
External Inspection & Cleaning of the
Air Intake Chamber Screen
1. At least twice annually inspect the air intake chamber
screen (Figure 27) for any dust or debris that may have
accumulated on the louvers. NOTE: If the water heater
is located in an area that is subjected to lint and dirt,
it may be necessary to check the air intake chamber
screen more frequently.
2. Use a vacuum cleaner with a
hose attachment to remove any
dust or debris that may have
accumulated on the screen.
Retainer Clip
Igniter Assembly
FIGURE 26.
FIGURE 27.
Cleaning the Combustion Chamber and Air
Diverter Assembly
1. Follow procedure outlined in "Removing the Manifold/
Burner Assembly".
2. Use a vacuum cleaner/shop vac to remove all loose
debris in the combustion chamber (Figure 28). Use
compressed air to clear any dust or debris that may
have accumulated on the air diverter assembly.
Manifold
Door Gasket
3. Reassemble following the procedure under "Replacing
the Manifold/Burner Assembly"
Flame Sense/
Replacing the Manifold/Burner Assembly
Hot Surface
Remove any fiberglass between gasket and
•
combustion chamber.
•
Replace viewport if glass is missing or damaged.
Replace two piece wire connector if missing or
•
removed.
• Replace door gasket if damaged.
• Tighten both manifold door screws securely.
• Failure to follow these instructions can result in
death, explosion, or fire.
1. Check the door gasket for damage or imbedded debris
prior to installation.
2. Inspect the view port for damage and replace as
required.
26
Combustion
Air Diverter
Chamber
Assembly
FIGURE 28.
WARNING
Explosion Hazard