11 Maintenance (continued)
Cleaning boiler heat exchanger
For recommended materials; including brush, appropriate extension(s), refractory cover, and detailed instructions see Table 11B - Heat Exchanger Cleaning Kits.
1.Shut down boiler:
•Follow the “To Turn Off Gas to Appliance” instructions for the boiler in Section 9 - Startup.
•Do not drain the boiler unless it will be exposed to freezing temperatures. If using freeze prevention fluid in system, do not drain.
2.Allow time for the boiler 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 boiler contains ceramic fiber materials. Use care when handling these materials
per instructions on page 62 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 boiler 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.
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 boiler from system. Attach a hose to the boiler drain and flush boiler thoroughly with clean water by using purging valves to allow water to flow through the water
12.Perform
13.Replace the access cover and restore boiler to operation.
Installation & Operation Manual
Table 11B | Heat Exchanger Cleaning Kits | |||
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Model |
| Kit | Part | Component |
Number |
| Number | Number | Description |
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| MSC20083* | Nylon 4" Wheel Brush* |
|
|
|
| |
SB 1.0 - 1.5 | KIT30064 | MSC20085 | 1/4" x 12" Drill Extension | |
|
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| MSC20086 | 1/4" x 24" Drill Extension |
|
|
|
|
|
CAUTION * Do NOT use a metal brush. Only use the kit provided brush or an equivalent
replacement nylon brush.
Figure 11-3 Rope Gasket - Heat Exchanger Door
ROPE GASKET
CAUTION: IF GASKET IS DAMAGED
DO NOT REUSE, THE HEAT EXCHANGER DOOR
MUST BE REPLACED.
Rope gasket is intended for sealing combustion NOTICE (FIG.
heat exchanger door must be replaced. Consult factory for replacement heat exchanger door (kit WTR3086).
61 
