Lochinvar FTxl 500 Service Manual page 48

3
Troubleshooting
Table 3-5 Flue Products
Natural Gas
CO O
2 2
8.0% - 10% 3.0% - 6.5%
7. Once the boiler has modulated up to full fire, measure the
combustion. The values should be in the range listed in
Table 3-5. The CO levels should be less than 150 ppm for
a properly installed unit.
If the combustion is not within the specified range,
reference Table 3-6 for possible causes and corrective
actions.
8. Once the combustion analysis is complete, test the safety
shutoff device by turning the manual shutoff valve to the
OFF position and ensuring that the boiler shuts down
and registers an alarm. Open the manual shutoff valve,
reset the control, and return to Service Mode.
9. Turn the main power off to the boiler and replace the flue
temperature sensor into the flue pipe connection.
10. Place the boiler back into normal operation.
You must replace the plug in the flue
WARNING
sample port to prevent flue gas spillage
into the room. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
Table 3-6 Troubleshooting Chart - Combustion Levels
POSSIBLE CAUSE
Vent/Air Intake Length
or Obstruction
Gas Supply Pressure
Dirty/Damaged Burner
Gas Valve Adjustment
48
Propane
CO O
2 2
9.0% - 11% 4.1% - 6.9%
• Refer to Section 3 - General Venting of the FTXL Installation and Operation Manual
for the proper venting and air intake methods for the FTXL boiler.
• Check for obstructions at the vent/air intake terminals.
• Refer to Section 7 - Gas Connections of the FTXL Installation and Operation
Manual for the proper gas supply for the FTXL boiler.
• Refer to page 34 of this manual for burner removal and cleaning procedures.
• Replace burner if necessary.
• Refer to page 49 of this manual for the gas valve adjustment procedure.
CORRECTIVE ACTION
Service Manual