27
Cleaning the Combustion Chamber and
Flame-arrestor
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 32). Use
compressed air to clear any dust or debris that may
have accumulated in the flame-arrestor.
DOOR GASKET
FLAME ARRESTOR COMBUSTION CHAMBER
BASE-RING
FILTER
FIGURE 32.
3. Reassemble following the procedure under “Replacing
the Manifold/Burner Assembly”.
Replacing the Manifold/Burner Assembly
WARNING
Explosion Hazard
• Tighten both manifold door screws securely.
• 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.
• 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.
3. Insert the manifold/burner assembly into the burner
compartment, making sure that the tip of the manifold
tube engages in the slot of the bracket inside the com-
bustion chamber (Figures 33 & 34).
4. Inspect the door gasket and make sure there is no
fiberglass insulation between the gasket and the
combustion chamber.
5. Replace the two screws, which secure the manifold/
burner assembly door to the combustion chamber and
tighten securely. Once the manifold/burner assembly
door is tightened, visually inspect the door gasket
between the manifold/burner assembly door and the
combustion chamber for spaces or gaps that would
prevent a seal. IMPORTANT: Do not operate the water
heater if the door gasket does not create a seal be-
tween the manifold door and the combustion chamber.
6. During the following procedure, do not cross-thread
or apply any thread sealant to any of the fittings listed
below. First, reconnect the manifold tubing to the gas
control valve/thermostat. NOTE: L.P. gas systems use
reverse (left-hand) threads on the manifold tube.
NOTE: If a ferrule nut needs to be installed for the pilot
tube, locate the one provided with your parts kit. Install
it in the gas control valve/thermostat at the pilot loca-
tion, hand tight only.
Next, insert the pilot tube into the ferrule nut until it bot-
toms out. NOTE: Hold the tube in this position. Tighten
the ferrule nut with a wrench until the crimp connection
seals to the pilot tube. Continue to tighten until the nut
is tight in the gas control valve/thermostat. When you
are finished, connect the two wire leads that go to the
thermal switch.
7. Reconnect the igniter wire.
8. Turn gas supply on and refer to the Lighting Instruc-
tions.
9. With the burner lit, check the gas control valve/thermo-
stat supply line, manifold component block, manifold
tube, and pilot tube connections for leaks. Check for
leaks by brushing on an approved noncorrosive leak
detection solution. Bubbles forming indicate a leak.
Correct any leak found. IMPORTANT: All leaks must be
fixed immediately.
10. Replace the outer door.
DOOR GASKET
FLAME ARRESTOR COMBUSTION CHAMBE
BASE-RING
FILTER
FIGURE 33.
