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SECTION II: GENERAL INFORMATION
HIGH LIMIT COMMISSIONING
To prove functionality, the temperature limiting safety function may be tested by selecting
the High Limit Commissioning Test via the display. The high limit temperature is factory set
at 190°F. For safety reasons, the factory set high limit will automatically lower to equal the
operating setpoint when the test is started. To conduct the High Limit Commissioning Test,
perform the following procedure.
1) The water heater must be in “DEMAND”
before starting this test. To create a demand for
hot water open a faucet, or increase the setpoint
temperature by 10°F.
2) Using the display, navigate to the Settings
tab. Select the Test option, and then select High
Limit Commissioning Test.
3) With the water heater running in DEMAND,
press the Start button from the High Limit
Commissioning Test screen.
4) Return to the Home screen and a yellow message will appear below the power bar that
reads, “High Limit Commissioning Test In Progress.”
5) When the sensor temperature equals the setpoint, gas flow to the burner will stop and the
blower will enter post purge. The water heater will be in “LOCKOUT ERROR” and the error
code “A18 – MAX TEMP ERROR” shall be displayed.
6) Press the Reset button to exit the test mode and resume normal operation.