11
PREPARATION OF COMBUSTION CHAMBER
Clean the combustion chamber thoroughly. Scrape and brush all heating surfaces and flue ways. Soot and fly ash are
excellent insulators and unless removed, the efficiency of the heating appliance will be impaired. Plugged or restricted
flue passages will prevent burner from operating properly.
Be sure water column and gauge on boiler are clean and water level is visible. In all cases make sure the pigtail to limit
control is clear. Safety pop valves on steam boilers and automatic relief valves on closed water systems should be
thoroughly checked to make sure they are in good working condition.
When converting oil designed boilers and furnaces, it is recommended that the existing combustion chamber be used
with the gas burner, provided it is in good condition. If the blast tube opening into the combustion chamber is larger
than the 4” (102 mm) diameter, high temperature cement should be used to reduce the opening to 4” (102 mm)
diameter.
IN NO CASE SHOULD THE TUBE BE ALLOWED TO EXTEND INTO THE CHAMBER PROPER. IT MUST BE AT
LEAST 1/8” (3.2mm) SHORT OF THE INSIDE SURFACE OF THE COMBUSTION CHAMBER. (SEE FIGURES 6, 7,
8)
Forced Air Furnace
Figure 6
Hot Water or Steam Boiler
with Combustion Chamber
Target
Figure 7
Hot Water or Steam Boiler
with Combustion Chamber
Liner
Figure 8
To Protect Properly
Locate End of Burner Tube. Position Tube
1/8” (3.2 mm) Short of Inside of
Combustion Chamber
To Protect Properly
Locate End of
Burner Tube.
Position Tube 1/8”
(3.2 mm) Short of
Inside of
Combustion
Chamber
To Protect Properly
Locate End of
Burner Tube.
Position Tube 1/8”
(3.2 mm) Short of
Inside of
Combustion
Chamber
Existing
Prefabricated
Combustion
Chamber
Liner
Existing
Prefabricated
Combustion
Chamber
Liner
Existing
Prefabricated
Combustion
Chamber
Liner
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