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REPLACING THE HIGH TEMPERATURE CUT OFF SWITCH ASSEMBLY
Your American Standard VAPOR SHIELD water heater
is equipped with a high temperature cut off switch that
is provided to shut down the water heater when the
screen air intake becomes blocked, the high temperature
cut off switch will shut down the pilot and cut off the
highly unlikely since this high temperature cut off switch
is required to function only when the air intake screen
becomes blocked. If such an incident occurs however the
small screen to the left of the burner should be checked
for blockage and the high temperature cut off switch
should be checked to determine if it has shut off. If switch
has shut off, merely clean the screen per the previous
instructions and press the red reset bottom on the end of
the switch.You should then be able to restart the heater
according to the start up instructions. If the water heater
will not start in this manner, proceed according to the
following:
Instructions.-
I.-Disconnect the manifold, pilot tube, thermocouple and piezo ignition switch from the control.Also disconnect the high temperature cut off
switch wires from the wire terminals on the switch.These are slip on two wire spade connection. Pull the piezo igniter off the control. It is held
in place with a spring clip.
2.-Remove the 4 bolts holding the burner mounting plate in the combustion chamber.
4.-Once the burner is removed drill out the four rivets holding the high temperature cut off switch assembly bracket on to the burner
with a 1/8" drill bit. Replace the defective high temperature cut off switch assembly bracket with a factory supplied switch assembly bracket
that includes sheet metal screws and appropriate washers. Note: Only factory provided switches, washers and screws can be used for this
replacement.
5.-Re-install the burner taking care not to damage the burner plate mounting gasket or the pilot assembly.
two spade connections wires and be sure to reset this heat switch pushing softly the red button.
7.-Turn on the gas and make sure all connections are tight and you cannot smell gas.Then light the heater according to the lighting instructions.
When the burner comes on, check for leaks at the manifold nut and pilot connection with a soapy water solution.
THERMOCOUPLE,
In the unlikely event that it would be necessary to replace the piezo igniter, pilot or thermocouple it is necessary to
replace the entire pilot assembly. These parts are all part of this assembly and cannot be replaced separately. To replace
this assembly follow the instructions for removing the burner that are provided for thermocouple replacements. After
removing the burner assembly, unscrew the pilot bracket from the burner and remove the rubber grommet from
the burner mounting plate. Attach the entire pilot assembly which includes the thermocouple, pilot, piezo igniter and
rubber grommet to the burner. Run the pilot tube, thermocouple and piezo igniter wire, through the hole in the burner
mounting plate. Then push the new rubber grommet into the hole in the burner mounting plate.
on the switch to determine if the switch is still in the
open position.A continuity tester can also be used for
this purpose.
2. If this test shows that the switch is defective, the
switch should be replaced but the FVIR feature of the
until a new switch can be obtained. If a gasoline spill
occurs prior to the installation of a new switch, the
gasoline vapors will still be drawn into the combustion
chamber of the water heater where they will burn and
render the water heater inoperative.
3. To replace the high temperature cut off switch
proceed per the following.
PILOT AND PIEZO IGNITER REPLACEMENT
14
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