63
CLEANING HEAT EXCHANGER
For recommended materials; including brush, appropriate
extension(s), refractory cover, and detailed instructions see
Table 30 - Heat Exchanger Cleaning Kits.
1. Shut down water heater:
• Follow the “To Turn Off Gas to Appliance” instructions for
the water heater in Start Up section.
• Do not drain the water heater unless it will be exposed to
freezing temperatures. If using freeze prevention uid in
system, do not drain.
2. Allow time for the water heater to cool to room temperature
if it has been ring.
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.
The water heater contains ceramic ber materials. Use care
when handling these materials per instructions in the Service
Handbook. Failure to comply could result in severe personal
injury.
5. Remove the condensate hose from the heat exchanger end.
Connect a eld supplied 3/4" diameter hose to a drain pan.
Using eld 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 after cleaning.
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 eld 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 ush
water heater thoroughly with clean water by using purging
valves to allow water to ow through the water make-up line
to the water heater.
12. Perform start-up and check-out procedures in the Check
Flame and Combustion - on Pages 50 and 51 of this manual.
13. Replace the access cover and restore water heater to
operation.
Table 30. Heat Exchanger Cleaning Kits
MODEL KIT
NUMBER
PART
NUMBER
COMPONENT
DESCRIPTION
150 - 400 100274672
100140243 Rear Refractory
Cover
100162565* Nylon 4" Wheel
Brush*
100162566 3mm Allen Wrench
100162568 1/4" x 24" Drill
Extension
500 - 800 100274673
100140243 Rear Refractory
Cover
100162565* Nylon 4" Wheel
Brush*
100162567 1/4" x 12" Drill
Extension
100162568 1/4" x 24" Drill
Extension
NOTE: * Do NOT use a metal brush. Only use the kit provided
brush or an equivalent replacement nylon brush.
Figure 78. Rope Gasket - Heat Exchanger Door
NOTE: Rope gasket is intended for sealing combustion (see
Figure 78). If gasket is damaged DO NOT reuse, the heat
exchanger door must be replaced. Consult factory for replacement
heat exchanger door (Kit 100274674 and 100274675).
CHECK DELTA T
1. Check Table 22 on Page 37 for Delta T reference.
OILED BEARING CIRCULATORS
1. The circulator shipped with the XP 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.
To Next Page
Loading...