John Wood Atmospheric Gas (ENERGY STAR) - NEW - Manuel (Page 26)

26
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 29). 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 29.
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 manifold component block 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
combustion chamber (Figures 30 & 31).
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 between 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
location, hand tight only.
Next, insert the pilot tube into the ferrule nut until it
bottoms 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
Instructions.
9. With the burner lit, check the gas control valve/
thermostat 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 CHAMBER
BASE-RING
FILTER
FIGURE 30.