Sequence of Operation…
During initial
Once the control verifies the blower vacuum switch is open, the control will energize the blower motor for the
The control will verify the blower vacuum switch has closed, ensuring that the blower is functioning properly and that the venting system is not blocked.
The control will then proceed through a sequence of
During the trial for ignition, the hot surface ignitor will warm up.
Once the hot surface ignitor warms up, the main gas valve will open allowing gas to flow to the main burner.
Once the main burner ignites, the control will verify that the burner flame is present through the flame sense circuit. The hot surface ignitor will then turn off.
The main burner will remain lit throughout the heat cycle until the water temperature setting is reached.
Once the water temperature setting is reached, the control will close the main gas valve which will extinguish the main burner flames.
The blower motor will stay energized for an additional 30 seconds after the control verifies that the burner flame is extinguished in order to clear combustion gases from the water heater.
After the
This water heater is equipped with a flammable vapor sensor that is monitored continuously by the electronic control in all modes of operation.
In the event that flammable vapors are detected, the control will automatically shut down the water heater and prevent the water heater from being started again.
The following is a list of materials that will cause the Flammable Vapor Sensor to shut down the water heater.
Vapors of Gasoline.
Vapors of certain flammable paints, stains, and thinners.
Vapors of vent pipe Cement & Solvents.
Bleach (direct contact with flammable vapor sensor).
Some other flammable materials and their vapors.
If the flammable vapor sensor shuts down the water heater, then the electronic control will display the appropriate error code and you should then promptly
contact a qualified service technician.
Refer to the “Notice” on page 3 for additional information.
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