Rheem GHE80SU Use & Care Manual page 39

Gas Valve Adjustments (Cont.)
The target CO2% is from 10-10.8% (2.4-3.8% O2) at
the lower fan speed during the gas valve adjustment
test.
The target CO2% is approximately 9% (5.5% O2)
when the blower is at full input/normal operation. (not
during gas valve adjustment test)
Upon completing any necessary gas valve adjust-
ments, press the "End Test" button to complete the
test, else the test will continue until the timer expires.
If the duration timer expires during the test, the test
timed out, and a message will appear on the screen.
The Ignition Control will transition to Post-Purge be-
fore Disabling, and then the test will end.
Gas Valve Adjustment Test
Test timed out and may not have completed.
Press the back arrow to exit to the service menu.
If, during the gas valve adjustment test, the tank tem-
perature exceeds that of the setpoint temperature,
the test will end. The unit will go into Post-Purge and
a "Heating Cycle Completed" message will appear on
the screen.
Gas Valve Adjustment Test
Heating Cycle Completed - Stopping Test...
Gas Valve GHE119-500 Model ONLY
Detailed view
of offset
adjustment
screw.
Once the Post-Purge is completed, the "Test Com-
pleted" message will appear on the screen.
Gas Valve Adjustment Test
Test Complete.
If further testing is required, press the back arrow
to return to the Service Screen in order to continue
adjustment of the unit.
If no further testing is required, power cycle
the water heater.
Press the back arrow to back out of the Test Screen
and go to the Service Screen.
If the ignition control reads "Fault" or "Disabled," the
test will end, and the corresponding message will ap-
pear.
Gas Valve Adjustment Test
System Ended Test.
If further testing is required, press the back arrow
to return to the Service Screen in order to continue
adjustment of the unit.
If no further testing is required, power cycle
the water heater.
Press the back arrow to go back to the Service Screen
to continue the test, or power cycle the water heater if
finished
If the "End Test" button is pressed while the test is
running, the test will stop, and the corresponding
message will appear.
Gas Valve Adjustment Test
User Ended Test.
The Ignition Control will transition to Disabled, back
out of the Test Screen to go back to the Service
Screen.
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