Cleaning Boiler Heat Exchanger - Lochinvar FTxl 400 Installation & Operation Manual

12
Maintenance
Check fl ame signal
1. At high fi re the fl ame signal shown on the display should
be at least 10 microamps.
2. A lower fl ame signal may indicate a fouled or damaged
fl ame sense electrode. If cleaning the fl ame sense electrode
does not improve, ground wiring is in good condition,
and ground continuity is satisfactory, replace the fl ame
sense electrode.
3. See Section 3 - Troubleshooting in the FTXL Service
Manual for other procedures to deal with low fl ame
signal.
Review with owner
1. Review the FTXL User's Information Manual with the
owner.
2. Emphasize the need to perform the maintenance schedule
specifi ed in the FTXL User's Information Manual (and in
this manual as well).
3. Remind the owner of the need to call a licensed contractor
should the boiler or system exhibit any unusual behavior.
4. Remind the owner to follow the proper shutdown
procedure and to schedule an annual start-up at the
beginning of the next heating season.

Cleaning boiler heat exchanger

1. Shut down boiler:
• Follow the "To Turn Off Gas to Appliance" instructions
for the boiler in Section 10 - Startup.
• Do not drain the boiler unless it will be exposed to
freezing temperatures. If using freeze prevention fl uid
in system, do not drain.
2. Allow time for the boiler to cool to room temperature if it
has been fi ring.
3. Remove the bezel from the unit.
4. Remove the screw securing the fan and venturi from the
fan plate and set aside.
5. Remove the nuts securing the fan plate and burner from
the heat exchanger plate and set aside (FIG. 12-2).
6. Loosen the heat exchanger bolts to remove the heat
exchanger top plate (FIG. 12-2).
The boiler contains ceramic fi ber materials.
WARNING
Use care when handling these materials per
instructions in the FTXL Service Manual.
Failure to comply could result in severe
personal injury.
(continued)
7. Disconnect the condensate hose from the condensate trap
and route to drain.
8. Use a vacuum cleaner to remove any accumulation on the
boiler heating surfaces. Do not use any solvent.
9. Using a clean cloth dampened with warm water, wipe out
the combustion chamber. Rinse out debris with a low
pressure water supply.
10. Allow the heat exchanger to thoroughly dry.
11. Reinstall the condensate hose, heat exchanger top plate,
burner, fan plate, fan, venturi, and bezel (FIG. 12-2).
12. Perform a combustion analysis by following the instructions
in Section 10 - Start-up - Check Flame and Combustion, on
pages 59 and 61 of this manual.
13. Resume operation.
Installation & Operation Manual
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