Lochinvar 151 - 801 Check flame signal, Review with owner, Cleaning heat exchanger, Model, Part

6. Use a vacuum cleaner to remove any accumulation on the water heater heating surfaces. Do not use any 2. solvent.

Table 2C Water Heater Pump Applications / Recommended Temperature Rise

1. Check the Delta T using Table 2C as a reference.

Service Manual

2Maintenance (continued)

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.

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 of the Installation and Operation Manual.

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

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 heat exchanger

For recommended materials; including brush, appropriate extension(s), refractory cover, and detailed instructions see Table 2B - 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 of the 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.

Table 2B Heat Exchanger Cleaning Kits

Model		Kit	Part	Component
	Number		Number	Description
			CTN20005	Rear Refractory Cover
151
			MSC20083*	Nylon 4" Wheel Brush*
-		KIT30063
			MSC20084	3mm Allen Wrench
400
			MSC20086	1/4" x 24" Drill Extension
			CTN20005	Rear Refractory Cover
501
			MSC20083*	Nylon 4" Wheel Brush*
-		KIT30064
			MSC20085	1/4" x 12" Drill Extension
801
			MSC20086	1/4" x 24" Drill Extension
		* Do NOT use a metal brush. Only use the kit
￿ CAUTION
		provided brush or an equivalent replacement
		nylon brush.

2. Allow time for the water heater to cool to room Check Delta T 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 the instructions on page 3 of this 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.

Water Heater Pump Applications

Model	*Pipe	Armstrong	Grundfos	Flow Rate	Loss	Temp.
	Size			(GPM)	(FT/HD)	Rise
151	1-1/4"	E8	--	16	16.6	18°F
200	1-1/4"	E8	--	21	11.8	18°F
286	2"	E17	--	30	17.1	18°F
400	2"	E24	--	39	21	18°F
501	2"	E22	--	53	26	18°F
601	2"	E22	--	53	26	22°F
701	2"	--	TP 40-160	63	32	22°F
801	2"	--	TP 40-160	67	31	24°F

Oiled bearing circulators

1.The circulator shipped with the Armor water heater is water- lubricated. No oiling is required.

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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