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Maintenance, Check flame signal, Review with owner – Lochinvar Knight Wall Mount Soiler 51-211 User Manual

Page 76: Cleaning boiler heat exchanger

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Installation & Operation Manual

76

12

Maintenance

Figure 12-2 Burner Assembly

Check flame signal

1. At high fire the flame signal shown on the display should

be at least 10 microamps.

2. A lower flame signal may indicate a fouled or damaged

flame sense electrode. If cleaning the flame sense electrode
does not improve, ground wiring is in good condition,
and ground continuity is satisfactory, replace the flame
sense electrode.

3. See Section 3 - Troubleshooting of the Knight Wall

Mount Service Manual for other procedures to deal with
low flame signal.

Review with owner

1. Review the Knight Wall Mount User’s Information

Manual with the owner.

2. Emphasize the need to perform the maintenance schedule

specified in the Knight Wall Mount 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.

The boiler contains ceramic fiber materials.
Use care when handling these materials per
instructions in the Service Manual. Failure
to comply could result in severe personal
injury.

ƽ WARNING

Cleaning boiler heat exchanger

For recommended materials; including brush, appropriate
extension(s), refractory cover, and detailed instructions see
Table 12B - Heat Exchanger Cleaning Kits.

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 fluid
in system, do not drain.

2. Allow time for the boiler to cool to room temperature if

it has been firing.

3. Remove the nuts securing the heat exchanger access cover

to the heat exchanger and set aside.

4. Remove the heat exchanger access cover, burner, and

gas/air arm assembly.

5. Remove the condensate hose from the heat exchanger end.

Connect a field supplied 3/4" diameter hose to a drain pan.
Using field supplied means, cover the refractory in the back
of the combustion chamber of the heat exchanger.

6. Use a vacuum cleaner to remove any accumulation on the

boiler heating surfaces. Do not use any solvent.

7. Brush the heat exchanger while dry using a nylon bristle

brush. Caution: DO NOT use a metal brush. Re-vacuum
the heat exchanger.

8. Finish cleaning using a clean cloth dampened with warm

water. Rinse out debris with a low pressure water supply.

9. Allow the heat exchanger to thoroughly dry.

10. Remove the field supplied rear refractory cover from the

back of the combustion chamber of the heat exchanger and
reassemble.

11. Close isolation valves on piping to isolate boiler from

system. Attach a hose to the boiler drain and flush boiler
thoroughly with clean water by using purging valves to
allow water to flow through the water make-up line to the
boiler.

12. Perform start-up and check-out procedures in the Check

Flame and Combustion - Section 10 - Startup on pages 59
and 61 of this manual.

13. Replace the access cover and restore boiler to operation.