Cleaning water heater heat exchanger, Check Delta T

2 Maintenance

Cleaning water heater 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:

•Followthe“ToTurnOffGastoAppliance”instructions for the heater in the Armor X2 Installation and Operation Manual.

•Do not drain the heater unless it will be exposed to freezing temperatures.

2.Allow time for the 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 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.

6.Use a vacuum cleaner to remove any accumulation on the 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 of the Armor X2 Installation and Operation Manual.

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

Service Manual

Table 2B Heat Exchanger Cleaning Kits

Model		Kit	Part	Component
Number	Number		Number	Description

			MSC20083*	Nylon 4” Wheel Brush*

AW 1.0 - 1.5	KIT30064		MSC20085	1/4” x 12” Drill Extension

			MSC20086	1/4” x 24” Drill Extension

		* Do NOT use a metal brush. Only use
CAUTION		* Do NOT use a metal brush. Only use
CAUTION		the kit provided brush or an equivalent
		the kit provided brush or an equivalent
		replacement nylon brush.

Check Delta T

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

Table 2C Water Heater Pump Applications / Recommended Temperature Rise

Water Heater Pump Applications

	*Pipe		Pump	Pump	**Flow	Loss	Temp.
	Size				**Flow	Loss
Model	Size				Rate	(FT/
Model			Make	Model	Rate	(FT/	Rise
	Inlet	Outlet	Make	Model	(GPM)	HD)	Rise
	Inlet	Outlet			(GPM)	HD)

1.0	2"	3"	Armstrong	E22	100	26	22°F
1.3	2"	3"	Grundfos	TP 40-160	125	32	22°F
1.5	2"	3"	Grundfos	TP 40-160	130	31	24°F

*Note: Pump sizing and flow requirements are based on 45 feet of piping, 4 - 90° elbows, and 2 - fully ported ball valves.

**Note: This appliance is shipped with two pumps to meet the ﬂow requirements listed above.

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.

2 Maintenance