Rheem TRITON GHE80SS Service Training Manual page 52

Rheem TRITON TM
Service Manual
GAS PRESSURE CHECKING PROCEDURES
NOTE: To correctly adjust the offset screw, turn the
hex head tool ½ turn in the desired direction and then
back ¼ turn. This counts as a ¼ turn and ensures the
offset screw adjusts properly. Adjust in this ¼ pattern
until the target CO2% is reached.
The target CO2% level depends on fuel used in the system and
can be seen in the table below.
Fuel Type Target Low Fire CO2% (~O2%)
Natural Gas 10-10.8% (~2.4-3.8%)
Propane 12-12.8% (~1.8-3%)
NOTE: Venting configurations and elevation directly
affect CO2% levels in the system and may require rich-
er (higher CO2%) at low fire/ignition.
Upon completing any necessary gas valve adjustments, press
the "End Test" button to complete the test, else the test will con-
tinue 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 before 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 temperature
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...
Detailed view of offset
adjustment screw.
Target High Fire CO2% (~O2%)
9% (~5.5%)
11% (~4.5%)
52
Once the Post-Purge is completed, the "Test Completed" mes-
sage 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 appear.
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 contin-
ue 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.