2 Maintenance
Table 2B Heat Exchanger Cleaning Kits
27
Service Manual
Rope gasket is intended for sealing
combustion (see FIG. 2-3). If gasket is
damaged DO NOT reuse, the heat exchanger
door must be replaced. Consult factory for
replacement heat exchanger door.
NOTICE
Figure 2-3 Rope Gasket - Heat Exchanger Door
The water heater contains ceramic fiber
materials. Use care when handling these
materials per instructions in this manual.
Failure to comply could result in severe
personal injury.
⚠ WARNING
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 the Start-up section of the
Installation & Operation Manual.
• Do not drain the water heater unless it will be exposed
to freezing temperatures. If using freeze protection
fluids in the 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.
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 makeup line
to the water heater.
12. Perform start-up and check-out procedures in the Check
Flame and Combustion - Section 11 - Startup of the
Installation & Operation Manual.
13. Replace the access cover and restore water heater to
operation.
* Do NOT use a metal brush. Only use
the kit provided brush or an equivalent
replacement nylon brush.
⚠ CAUTION
Model
Kit
Number
Part
Number
Component
Description
400 - 1000 100157628
100333410
Rear Refractory Cover,
10.75" Diameter
100208804
Rear Refractory Cover,
7.25" Diameter
100208309* Nylon 4" Wheel Brush*
100208310
1/4" x 12" Drill
Extension
100208311
1/4" x 24" Drill
Extension
DIR #2000585246 00
ROPE GASKET
CAUTION: IF GASKET IS DAMAGED
DO NOT REUSE, THE GASKET MUST
BE REPLACED.
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.
Check Delta T
1. Check Delta T. Reference Section 7 - System Piping for
more information regarding Delta T.
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