Lochinvar WH 55-399 Perform start-upand checks, Check burner flame, Check flame signal

12 Maintenance (continued)

Perform start-up and checks

1.Start boiler and perform checks and tests specified in Section 10 - Start-up.

2.Verify cold fill pressure is correct and that operating pressure does not go too high.

Check burner flame

1.Inspect flame through observation window.

2.If the flame is unsatisfactory at either high fire or low fire, turn off boiler and allow boiler to cool down. Remove the burner and clean it thoroughly using a vacuum cleaner or compressed air. Do not use compressed air to clean burner if performed inside a building.

3.Remove the burner, reference FIG. 12-2 (page 77).

4.When replacing the burner, ensure gasket is in good condition and positioned correctly (FIG. 12-2).

Figure 12-2Burner Assembly

BURNER PLATE

GASKET,

BURNER PLATE

INSULATION,

BURNER DOOR

BURNER

GASKET

BURNER

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.

Installation & Operation Manual

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.

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 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 and burner.

￿WARNING 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.

5.Remove the condensate trap from the bottom of the boiler. Place a bucket underneath the condensate fitting attached to the heat exchanger.

6.Use a vacuum cleaner to remove any accumulation on the boiler heating surfaces. Do not use any solvent.

7.Using a clean cloth dampened with warm water, wipe out the combustion chamber. Rinse out debris with a low pressure water supply.

8.Allow the heat exchanger to thoroughly dry.

9.Perform start-up and check-out procedures in the Check Flame and Combustion - Section 10 - Startup on pages 59 and 62 of this manual.

10.Replace the burner, access cover and condensate trap. Restore boiler to operation.

￿ CAUTION * Do NOT use a metal brush.

Oiled bearing circulators

1.The circulator shipped with the Knight wall mount boiler is water-lubricated. No oiling is required.

2.Check other circulators in the system. Oil any circulators requiring oil, following circulator manufacturer’s instructions. Over-oiling will damage the circulator.

3. Replace the boiler front access cover. 77