Lochinvar 151 operation manual Perform start-up and checks, Check burner flame, Check flame signal

12 Maintenance

Perform start-up and checks

1.Start water heater 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 water heater and allow water heater 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 below.

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

Figure 12-2Burner 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 in the Armor Service Manual for other procedures to deal with low flame signal.

Review with owner

1.Emphasize the need to perform the maintenance schedule specified in this manual.

2.Remind the owner of the need to call a licensed contractor should the water heater or system exhibit any unusual behavior.

Installation & Operation Manual

3.Remind the owner to follow the proper shutdown procedure and to schedule an annual start-up.

Cleaning 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 water heater:

•Follow the “To Turn Off Gas to Appliance” instructions for the water heater in Section 10 - Startup.

•Do not drain the water heater unless it will be exposed to freezing temperatures. If using freeze prevention fluid in system, do not drain.

2.Allow time for the water heater 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.

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

12.Perform start-up and check-out procedures in the Check Flame and Combustion - Section 10 - Startup on pages 54 and 57 of this manual.

13.Replace the access cover and restore water heater to operation.

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