Owner's Manual

33
MANIFOLD TUBE
BRACKET
TAB
SLOT
BURNER
CLOSE-UP INSIDE VIEW OF
THE COMBUSTION CHAMBER.
FIGURE 42.
Igniter System
The STP (Spark-to-Pilot) igniter system consists of the pilot,
electrode, and wire. The pilot is ignited by an electric spark
generated when the gas control valve/thermostat sends an
electrical signal to the electrode. Use only factory authorized
STP igniter parts for replacement.
Pilot/Igniter-Flame
Sensor Bracket
Electrode
Pilot
Igniter Wire
Connection
Point
FIGURE 43.
Testing the Igniter System
Turn off the gas to the water heater at the manual gas shut-off
valve. Watch the electrode tip while activating the igniter. A
visible spark should jump from the electrode. To avoid shock,
do not touch the burner or any metal part on the pilot or pilot
assembly. If no spark is visible, check the wire connections
and make sure the electrode is not broken. Replace the igniter
if defective. Dirt and rust on the pilot or electrode tip can
prevent the igniter spark. Wipe clean with a damp cloth and dry
completely. Rust can be removed from the electrode tip and
metal surfaces by lightly sanding with an emery cloth or fine
grit sandpaper.
Removing and Replacing the Gas Control
Valve/Thermostat
IMPORTANT: This water heater has a resettable thermal
switch installed. Do not attempt to disable or modify this feature
in any way. Use only factory authorized replacement parts.
Removing the Gas Valve:
1. 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 12).
2. Move the ON/OFF switch on the gas control valve/
thermostat to the “OFF” position to turn off the water heater
and unplug from the wall outlet. (Figure 34).
3. Drain the water heater. Refer to the section of “Draining
and Flushing” section and follow the procedure.
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
BRACKET
BASE-RING
FILTER
FIGURE 41.