Lochinvar 150 - 500 Check flame signal, Review with owner, Cleaning water heater heat exchanger

Service Manual

2Maintenance

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 this 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.

3.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 water heater heat exchanger

1.Shut down water heater:

•Follow the “To Turn Off Gas to Appliance” instructions for the water heater in the Armor Water Heater Installation and Operation Manual.

•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 blower assembly (gas air/arm) from the heat exchanger access cover. Set bolts aside.

4.Remove the nuts securing the heat exchanger access cover to the heat exchanger and set aside.

5.Remove the heat exchanger access cover, cover gasket(s) and chamber insulation assembly.

￿WARNING The water heater contains ceramic fiber materials. Use care when handling these

materials per instructions on page 3 of this manual. Failure to comply could result in severe personal injury.

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

7.Finish cleaning using a clean cloth dampened with warm water.

8.Install access cover gasket, chamber insulation assembly and cover.

9.Secure nuts on the studs. DO NOT overtighten.

10.Re-install the blower assembly (gas air/arm) using the bolts set aside in Step 3.

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.When the water heater has been flushed, restore water heater to operation.

13.Perform start-up and check-out procedures in the Armor Water Heater Installation and Operation Manual.

Oiled bearing circulators

1.The circulator shipped with the Armor water heater 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.

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